% % This file is part of the Omega project, which % is based in the web2c distribution of TeX. % % Copyright (c) 1994--2000 John Plaice and Yannis Haralambous % applies only to the changes to the original vptovf.web. % % This program by D. E. Knuth is not copyrighted and can be used freely. % Version 1 was implemented in December 1989. % Version 1.1 fixed some for-loop indices for stricter Pascal (April 1990). % Version 1.2 fixed `nonexistent char 0' bug, and a bit more (September 1990). % Version 1.3 has more robust `out_scaled' (March 1991). % Version 1.4 (March 1995) initialized lk_step_ended (Armin K\"ollner). % Version 1.5 (August 1998) corrected vf_fix(0) (Wayne Sullivan). % Version 1.6 (January 2014) corrected possible end-of-line glitch (Ken Nakano), % and get_fix now treats -- as + (Peter Breitenlohner). % Version 1.0 of OVP2OVF (Month Year). % Version 1.11 (February 2000). % Version 1.12 (September 2009) various bug fixes by Peter Breitenlohner. % Version 1.13 (January 2014) more bug fixes. % Here is TeX material that gets inserted after \input webmac \def\hang{\hangindent 3em\indent\ignorespaces} \font\ninerm=cmr9 \let\mc=\ninerm % medium caps for names like SAIL \def\PASCAL{Pascal} \font\logo=logo10 % for the METAFONT logo \def\MF{{\logo METAFONT}} \def\(#1){} % this is used to make section names sort themselves better \def\9#1{} % this is used for sort keys in the index \def\title{OVP2OVF} \def\contentspagenumber{201} \def\topofcontents{\null \def\titlepage{F} % include headline on the contents page \def\rheader{\mainfont\hfil \contentspagenumber} \vfill \centerline{\titlefont The {\ttitlefont OVP2OVF} processor} \vskip 15pt \centerline{(Version 1.13, January 2014)} \vfill} \def\botofcontents{\vfill \centerline{\hsize 5in\baselineskip9pt \vbox{\ninerm\noindent The preparation of this program was supported in part by the National Science Foundation and by the System Development Foundation. `\TeX' is a trademark of the American Mathematical Society.}}} \pageno=\contentspagenumber \advance\pageno by 1 @* Introduction. The \.{OVP2OVF} utility program converts virtual-property-list (``\.{VPL}'' and ``\.{OVP}'') files into an equivalent pair of files called a virtual font (``\.{OVF}'') file and an $\Omega$ font metric (``\.{OFM}'') file. It also makes a thorough check of the given \.{VPL} or \.{OVP} file, so that the \.{OVF} file should be acceptable to device drivers and the \.{OFM} file should be acceptable to $\Omega$. In the following documentation, all unchanged references to the \.{VPtoVF} program and to \.{VPL}, \.{VF} and \.{TFM} files also apply to the \.{OVP2OVF} program and to \.{OVP}, \.{OVF} and \.{OFM} files. \indent\.{VPtoVF} is an extended version of the program \.{PLtoTF}, which is part of the standard \TeX ware library. \.{OVP2OVF} is an extended version of \.{VPtoVF} that allows much larger fonts. The idea of a virtual font was inspired by the work of David R. Fuchs @^Fuchs, David Raymond@> who designed a similar set of conventions in 1984 while developing a device driver for ArborText, Inc. He wrote a somewhat similar program called \.{PLFONT}. The |banner| string defined here should be changed whenever \.{OVP2OVF} gets modified. @d banner=='This is OVP2OVF, Version 1.13' {printed when the program starts} @ This program is written entirely in standard \PASCAL, except that it has to do some slightly system-dependent character code conversion on input. Furthermore, lower case letters are used in error messages; they could be converted to upper case if necessary. The input is read from |vpl_file|, and the output is written on |vf_file| and |tfm_file|; error messages and other remarks are written on the |output| file, which the user may choose to assign to the terminal if the system permits it. @^system dependencies@> The term |print| is used instead of |write| when this program writes on the |output| file, so that all such output can be easily deflected. @d print(#)==write(#) @d print_ln(#)==write_ln(#) @p program OVP2OVF(@!vpl_file,@!vf_file,@!tfm_file,@!output); const @@/ type @@/ var @@/ procedure initialize; {this procedure gets things started properly} var @@/ begin print_ln(banner);@/ @@/ end; @ The following parameters can be changed at compile time to extend or reduce \.{VPtoVF}'s capacity. @d char_max=@"FFFF @d xchar_max=char_max+1 @d xxchar_max=xchar_max+1 @d mem_max=xxchar_max+xxchar_max+xxchar_max+xxchar_max @# @d width_max=@"FFFF @= @!ofm_type=0; {16-bit OFM; sufficient for most purposes} @!max_char=char_max; {the largest character number in a font} @!xmax_char=xchar_max; {|max_char|+1} @!xxmax_char=xxchar_max;{|max_char|+2} @!mem_size=mem_max; {|max_char|*4+8} @!max_font=1000; {the largest font number} @!xmax_font=1001; {|max_font|+1} @!xxmax_font=1002; {|max_font|+2} @!max_width=width_max; {the largest character width number} @!max_height=255; {the largest character height number} @!max_depth=255; {the largest character depth number} @!max_italic=255; {the largest character italic correction number} @!buf_size=60; {length of lines displayed in error messages} @!max_header_bytes=100; {four times the maximum number of words allowed in the \.{TFM} file header block, must be 1024 or less} @!vf_size=200000; {maximum length of |vf| data, in bytes} @!max_stack=100; {maximum depth of simulated \.{DVI} stack} @!max_param_words=100; {the maximum number of \.{fontdimen} parameters allowed} @!max_lig_steps=800000; {maximum length of ligature program} @!xmax_label=800001; {must be greater than |max_lig_steps|} @!hash_size=130003; {preferably a prime number, a bit larger than |max_lig_steps|, the number of character pairs in lig/kern steps} @!hash_mult=16007; {another prime} @!max_kerns=100000; {the maximum number of distinct kern values} @ Here are some macros for common programming idioms. @d incr(#) == #:=#+1 {increase a variable by unity} @d decr(#) == #:=#-1 {decrease a variable by unity} @d do_nothing == {empty statement} @* Property list description of font metric data. The idea behind \.{VPL} files is that precise details about fonts, i.e., the facts that are needed by typesetting routines like \TeX, sometimes have to be supplied by hand. The nested property-list format provides a reasonably convenient way to do this. A good deal of computation is necessary to parse and process a \.{VPL} file, so it would be inappropriate for \TeX\ itself to do this every time it loads a font. \TeX\ deals only with the compact descriptions of font metric data that appear in \.{TFM} files. Such data is so compact, however, it is almost impossible for anybody but a computer to read it. Device drivers also need a compact way to describe mappings from \TeX's idea of a font to the actual characters a device can produce. They can do this conveniently when given a packed sequence of bytes called a \.{VF} file. The purpose of \.{VPtoVF} is to convert from a human-oriented file of text to computer-oriented files of binary numbers. There's a companion program, \.{VFtoVP}, which goes the other way. @= @!vpl_file:text; @ @= reset(vpl_file); @ A \.{VPL} file is like a \.{PL} file with a few extra features, so we can begin to define it by reviewing the definition of \.{PL} files. The material in the next few sections is copied from the program \.{PLtoTF}. An \.{OVP} file is simply a \.{VPL} file that does not restrict fonts to 256 characters. A \.{PL} file is a list of entries of the form $$\.{(PROPERTYNAME VALUE)}$$ where the property name is one of a finite set of names understood by this program, and the value may itself in turn be a property list. The idea is best understood by looking at an example, so let's consider a fragment of the \.{PL} file for a hypothetical font. $$\vbox{\halign{\.{#}\hfil\cr (FAMILY NOVA)\cr (FACE F MIE)\cr (CODINGSCHEME ASCII)\cr (DESIGNSIZE D 10)\cr (DESIGNUNITS D 18)\cr (COMMENT A COMMENT IS IGNORED)\cr (COMMENT (EXCEPT THIS ONE ISN'T))\cr (COMMENT (ACTUALLY IT IS, EVEN THOUGH\cr \qquad\qquad IT SAYS IT ISN'T))\cr (FONTDIMEN\cr \qquad (SLANT R -.25)\cr \qquad (SPACE D 6)\cr \qquad (SHRINK D 2)\cr \qquad (STRETCH D 3)\cr \qquad (XHEIGHT R 10.55)\cr \qquad (QUAD D 18)\cr \qquad )\cr (LIGTABLE\cr \qquad (LABEL C f)\cr \qquad (LIG C f O 200)\cr \qquad (SKIP D 1)\cr \qquad (LABEL O 200)\cr \qquad (LIG C i O 201)\cr \qquad (KRN O 51 R 1.5)\cr \qquad (/LIG C ? C f)\cr \qquad (STOP)\cr \qquad )\cr (CHARACTER C f\cr \qquad (CHARWD D 6)\cr \qquad (CHARHT R 13.5)\cr \qquad (CHARIC R 1.5)\cr \qquad )\cr}}$$ This example says that the font whose metric information is being described belongs to the hypothetical \.{NOVA} family; its face code is medium italic extended; and the characters appear in ASCII code positions. The design size is 10 points, and all other sizes in this \.{PL} file are given in units such that 18 units equals the design size. The font is slanted with a slope of $-.25$ (hence the letters actually slant backward---perhaps that is why the family name is \.{NOVA}). The normal space between words is 6 units (i.e., one third of the 18-unit design size), with glue that shrinks by 2 units or stretches by 3. The letters for which accents don't need to be raised or lowered are 10.55 units high, and one em equals 18 units. The example ligature table is a bit trickier. It specifies that the letter \.f followed by another \.f is changed to code @'200, while code @'200 followed by \.i is changed to @'201; presumably codes @'200 and @'201 represent the ligatures `ff' and `ffi'. Moreover, in both cases \.f and @'200, if the following character is the code @'51 (which is a right parenthesis), an additional 1.5 units of space should be inserted before the @'51. (The `\.{SKIP}~\.D~\.1' skips over one \.{LIG} or \.{KRN} command, which in this case is the second \.{LIG}; in this way two different ligature/kern programs can come together.) Finally, if either \.f or @'200 is followed by a question mark, the question mark is replaced by \.f and the ligature program is started over. (Thus, the character pair `\.{f?}' would actually become the ligature `ff', and `\.{ff?}' or `\.{f?f}' would become `fff'. To avoid this restart procedure, the \.{/LIG} command could be replaced by \.{/LIG>}; then `\.{f?}' would become `f\kern0ptf' and `\.{f?f}' would become `f\kern0ptff'.) Character \.f itself is 6 units wide and 13.5 units tall, in this example. Its depth is zero (since \.{CHARDP} is not given), and its italic correction is 1.5 units. @ The example above illustrates most of the features found in \.{PL} files. Note that some property names, like \.{FAMILY} or \.{COMMENT}, take a string as their value; this string continues until the first unmatched right parenthesis. But most property names, like \.{DESIGNSIZE} and \.{SLANT} and \.{LABEL}, take a number as their value. This number can be expressed in a variety of ways, indicated by a prefixed code; \.D stands for decimal, \.H for hexadecimal, \.O for octal, \.R for real, \.C for character, and \.F for ``face.'' Other property names, like \.{LIG}, take two numbers as their value. And still other names, like \.{FONTDIMEN} and \.{LIGTABLE} and \.{CHARACTER}, have more complicated values that involve property lists. A property name is supposed to be used only in an appropriate property list. For example, \.{CHARWD} shouldn't occur on the outer level or within \.{FONTDIMEN}. The individual property-and-value pairs in a property list can appear in any order. For instance, `\.{SHRINK}' precedes `\.{STRETCH}' in the example above, although the \.{TFM} file always puts the stretch parameter first. One could even give the information about characters like `\.f' before specifying the number of units in the design size, or before specifying the ligature and kerning table. However, the \.{LIGTABLE} itself is an exception to this rule; the individual elements of the \.{LIGTABLE} property list can be reordered only to a certain extent without changing the meaning of that table. If property-and-value pairs are omitted, a default value is used. For example, we have already noted that the default for \.{CHARDP} is zero. The default for {\sl every\/} numeric value is, in fact, zero, unless otherwise stated below. If the same property name is used more than once, \.{VPtoVF} will not notice the discrepancy; it simply uses the final value given. Once again, however, the \.{LIGTABLE} is an exception to this rule; \.{VPtoVF} will complain if there is more than one label for some character. And of course many of the entries in the \.{LIGTABLE} property list have the same property name. @ A \.{VPL} file also includes information about how to create each character, by typesetting characters from other fonts and/or by drawing lines, etc. Such information is the value of the `\.{MAP}' property, which can be illustrated as follows: $$\vbox{\halign{\.{#}\hfil\cr (MAPFONT D 0 (FONTNAME Times-Roman))\cr (MAPFONT D 1 (FONTNAME Symbol))\cr (MAPFONT D 2 (FONTNAME cmr10)(FONTAT D 20))\cr (CHARACTER O 0 (MAP (SELECTFONT D 1)(SETCHAR C G)))\cr (CHARACTER O 76 (MAP (SETCHAR O 277)))\cr (CHARACTER D 197 (MAP\cr \qquad(PUSH)(SETCHAR C A)(POP)\cr \qquad(MOVEUP R 0.937)(MOVERIGHT R 1.5)(SETCHAR O 312)))\cr (CHARACTER O 200 (MAP (MOVEDOWN R 2.1)(SETRULE R 1 R 8)))\cr (CHARACTER O 201 (MAP\cr \qquad (SPECIAL ps: /SaveGray currentgray def .5 setgray)\cr \qquad (SELECTFONT D 2)(SETCHAR C A)\cr \qquad (SPECIAL ps: SaveGray setgray)))\cr }}$$ (These specifications appear in addition to the conventional \.{PL} information. The \.{MAP} attribute can be mixed in with other attributes like \.{CHARWD} or it can be given separately.) In this example, the virtual font is composed of characters that can be fabricated from three actual fonts, `\.{Times-Roman}', `\.{Symbol}', and `\.{cmr10} \.{at} \.{20\\u}' (where \.{\\u} is the unit size in this \.{VPL} file). Character |@'0| is typeset as a `G' from the symbol font. Character |@'76| is typeset as character |@'277| from the ordinary Times font. (If no other font is selected, font number~0 is the default. If no \.{MAP} attribute is given, the default map is a character of the same number in the default font.) Character 197 (decimal) is more interesting: First an A is typeset (in the default font Times), and this is enclosed by \.{PUSH} and \.{POP} so that the original position is restored. Then the accent character |@'312| is typeset, after moving up .937 units and right 1.5 units. To typeset character |@'200| in this virtual font, we move down 2.1 units, then typeset a rule that is 1 unit high and 8 units wide. Finally, to typeset character |@'201|, we do something that requires a special ability to interpret PostScript commands; this example sets the PostScript ``color'' to 50\char`\%\ gray and typesets an `A' from \.{cmr10} \.{at} \.{20\\u} in that color. In general, the \.{MAP} attribute of a virtual character can be any sequence of typesetting commands that might appear in a page of a \.{DVI} file. A single character might map into an entire page. @ But instead of relying on a hypothetical example, let's consider a complete grammar for \.{VPL} files, beginning with the (unchanged) grammatical rules for \.{PL} files. At the outer level, the following property names are valid in any \.{PL} file: \yskip\hang\.{CHECKSUM} (four-byte value). The value, which should be a nonnegative integer less than $2^{32}$, is used to identify a particular version of a font; it should match the check sum value stored with the font itself. An explicit check sum of zero is used to bypass check sum testing. If no checksum is specified in the \.{VPL} file, \.{VPtoVF} will compute the checksum that \MF\ would compute from the same data. \yskip\hang\.{DESIGNSIZE} (numeric value, default is 10). The value, which should be a real number in the range |1.0<=x<2048|, represents the default amount by which all quantities will be scaled if the font is not loaded with an `\.{at}' specification. For example, if one says `\.{\\font\\A=cmr10 at 15pt}' in \TeX\ language, the design size in the \.{TFM} file is ignored and effectively replaced by 15 points; but if one simply says `\.{\\font\\A=cmr10}' the stated design size is used. This quantity is always in units of printer's points. \yskip\hang\.{DESIGNUNITS} (numeric value, default is 1). The value should be a positive real number; it says how many units equals the design size (or the eventual `\.{at}' size, if the font is being scaled). For example, suppose you have a font that has been digitized with 600 pixels per em, and the design size is one em; then you could say `\.{(DESIGNUNITS R 600)}' if you wanted to give all of your measurements in units of pixels. \yskip\hang\.{CODINGSCHEME} (string value, default is `\.{UNSPECIFIED}'). The string should not contain parentheses, and its length must be less than 40. It identifies the correspondence between the numeric codes and font characters. (\TeX\ ignores this information, but other software programs make use of it.) \yskip\hang\.{FAMILY} (string value, default is `\.{UNSPECIFIED}'). The string should not contain parentheses, and its length must be less than 20. It identifies the name of the family to which this font belongs, e.g., `\.{HELVETICA}'. (\TeX\ ignores this information; but it is needed, for example, when converting \.{DVI} files to \.{PRESS} files for Xerox equipment.) \yskip\hang\.{FACE} (one-byte value). This number, which must lie between 0 and 255 inclusive, is a subsidiary ident\-ifi\-ca\-tion of the font within its family. For example, bold italic condensed fonts might have the same family name as light roman extended fonts, differing only in their face byte. (\TeX\ ignores this information; but it is needed, for example, when converting \.{DVI} files to \.{PRESS} files for Xerox equipment.) \yskip\hang\.{SEVENBITSAFEFLAG} (string value, default is `\.{FALSE}'). The value should start with either `\.T' (true) or `\.F' (false). If true, character codes less than 128 cannot lead to codes of 128 or more via ligatures or charlists or extensible characters. (\TeX82 ignores this flag, but older versions of \TeX\ would only accept \.{TFM} files that were seven-bit safe.) \.{VPtoVF} computes the correct value of this flag and gives an error message only if a claimed ``true'' value is incorrect. \yskip\hang\.{HEADER} (a one-byte value followed by a four-byte value). The one-byte value should be between 18 and a maximum limit that can be raised or lowered depending on the compile-time setting of |max_header_bytes|. The four-byte value goes into the header word whose index is the one-byte value; for example, to set |header[18]:=1|, one may write `\.{(HEADER D 18 O 1)}'. This notation is used for header information that is presently unnamed. (\TeX\ ignores it.) \yskip\hang\.{FONTDIMEN} (property list value). See below for the names allowed in this property list. \yskip\hang\.{LIGTABLE} (property list value). See below for the rules about this special kind of property list. \yskip\hang\.{BOUNDARYCHAR} (integer value). If this character appears in a \.{LIGTABLE} command, it matches ``end of word'' as well as itself. If no boundary character is given and no \.{LABEL} \.{BOUNDARYCHAR} occurs within \.{LIGTABLE}, word boundaries will not affect ligatures or kerning. \yskip\hang\.{CHARACTER}. The value is an integer followed by a property list. The integer represents the number of a character that is present in the font; the property list of a character is defined below. The default is an empty property list. @ Numeric property list values can be given in various forms identified by a prefixed letter. \yskip\hang\.C denotes an ASCII character, which should be a standard visible character that is not a parenthesis. The numeric value will therefore be between @'41 and @'176 but not @'50 or @'51. \yskip\hang\.D denotes an unsigned decimal integer, which must be less than $2^{32}$, i.e., at most `\.{D 4294967295}'. \yskip\hang\.F denotes a three-letter Xerox face code; the admissible codes are \.{MRR}, \.{MIR}, \.{BRR}, \.{BIR}, \.{LRR}, \.{LIR}, \.{MRC}, \.{MIC}, \.{BRC}, \.{BIC}, \.{LRC}, \.{LIC}, \.{MRE}, \.{MIE}, \.{BRE}, \.{BIE}, \.{LRE}, and \.{LIE}, denoting the integers 0 to 17, respectively. \yskip\hang\.O denotes an unsigned octal integer, which must be less than $2^{32}$, i.e., at most `\.{O 37777777777}'. \yskip\hang\.H denotes an unsigned hexadecimal integer, which must be less than $2^{32}$, i.e., at most `\.{H FFFFFFFF}'. \yskip\hang\.R denotes a real number in decimal notation, optionally preceded by a `\.+' or `\.-' sign, and optionally including a decimal point. The absolute value must be less than 2048. @ The property names allowed in a \.{FONTDIMEN} property list correspond to various \TeX\ parameters, each of which has a (real) numeric value. All of the parameters except \.{SLANT} are in design units. The admissible names are \.{SLANT}, \.{SPACE}, \.{STRETCH}, \.{SHRINK}, \.{XHEIGHT}, \.{QUAD}, \.{EXTRASPACE}, \.{NUM1}, \.{NUM2}, \.{NUM3}, \.{DENOM1}, \.{DENOM2}, \.{SUP1}, \.{SUP2}, \.{SUP3}, \.{SUB1}, \.{SUB2}, \.{SUPDROP}, \.{SUBDROP}, \.{DELIM1}, \.{DELIM2}, and \.{AXISHEIGHT}, for parameters 1~to~22. The alternate names \.{DEFAULTRULETHICKNESS}, \.{BIGOPSPACING1}, \.{BIGOPSPACING2}, \.{BIGOPSPACING3}, \.{BIGOPSPACING4}, and \.{BIGOPSPACING5}, may also be used for parameters 8 to 13. The notation `\.{PARAMETER} $n$' provides another way to specify the $n$th parameter; for example, `\.{(PARAMETER} \.{D 1 R -.25)}' is another way to specify that the \.{SLANT} is $-0.25$. The value of $n$ must be positive and less than |max_param_words|. @ The elements of a \.{CHARACTER} property list can be of six different types. \yskip\hang\.{CHARWD} (real value) denotes the character's width in design units. \yskip\hang\.{CHARHT} (real value) denotes the character's height in design units. \yskip\hang\.{CHARDP} (real value) denotes the character's depth in design units. \yskip\hang\.{CHARIC} (real value) denotes the character's italic correction in design units. \yskip\hang\.{NEXTLARGER} (integer value), specifies the character that follows the present one in a ``charlist.'' The value must be the number of a character in the font, and there must be no infinite cycles of supposedly larger and larger characters. \yskip\hang\.{VARCHAR} (property list value), specifies an extensible character. This option and \.{NEXTLARGER} are mutually exclusive; i.e., they cannot both be used within the same \.{CHARACTER} list. \yskip\noindent The elements of a \.{VARCHAR} property list are either \.{TOP}, \.{MID}, \.{BOT} or \.{REP}; the values are integers, which must be zero or the number of a character in the font. A zero value for \.{TOP}, \.{MID}, or \.{BOT} means that the corresponding piece of the extensible character is absent. A nonzero value, or a \.{REP} value of zero, denotes the character code used to make up the top, middle, bottom, or replicated piece of an extensible character. @ A \.{LIGTABLE} property list contains elements of four kinds, specifying a program in a simple command language that \TeX\ uses for ligatures and kerns. If several \.{LIGTABLE} lists appear, they are effectively concatenated into a single list. \yskip\hang\.{LABEL} (integer value) means that the program for the stated character value starts here. The integer must be the number of a character in the font; its \.{CHARACTER} property list must not have a \.{NEXTLARGER} or \.{VARCHAR} field. At least one \.{LIG} or \.{KRN} step must follow. \yskip\hang\.{LABEL} \.{BOUNDARYCHAR} means that the program for beginning-of-word ligatures starts here. \yskip\hang\.{LIG} (two integer values). The instruction `\.{(LIG} $c$ $r$\.)' means, ``If the next character is $c$, then insert character~$r$ and possibly delete the current character and/or~$c$; otherwise go on to the next instruction.'' Characters $r$ and $c$ must be present in the font. \.{LIG} may be immediately preceded or followed by a slash, and then immediately followed by \.> characters not exceeding the number of slashes. Thus there are eight possible forms: $$\hbox to .8\hsize{\.{LIG}\hfil\.{/LIG}\hfil\.{/LIG>}\hfil \.{LIG/}\hfil\.{LIG/>}\hfil\.{/LIG/}\hfil\.{/LIG/>}\hfil\.{/LIG/>>}}$$ The slashes specify retention of the left or right original character; the \.> signs specify passing over the result without further ligature processing. \yskip\hang\.{KRN} (an integer value and a real value). The instruction `\.{(KRN} $c$ $r$\.)' means, ``If the next character is $c$, then insert a blank space of width $r$ between the current character character and $c$; otherwise go on to the next intruction.'' The value of $r$, which is in design units, is often negative. Character code $c$ must exist in the font. \yskip\hang\.{STOP} (no value). This instruction ends a ligature/kern program. It must follow either a \.{LIG} or \.{KRN} instruction, not a \.{LABEL} or \.{STOP} or \.{SKIP}. \yskip\hang\.{SKIP} (value in the range |0..127|). This instruction specifies continuation of a ligature/kern program after the specified number of \.{LIG} or \.{KRN} steps has been skipped over. The number of subsequent \.{LIG} and \.{KRN} instructions must therefore exceed this specified amount. @ In addition to all these possibilities, the property name \.{COMMENT} is allowed in any property list. Such comments are ignored. @ So that is what \.{PL} files hold. In a \.{VPL} file additional properties are recognized; two of these are valid on the outermost level: \yskip\hang\.{VTITLE} (string value, default is empty). The value will be reproduced at the beginning of the \.{VF} file (and printed on the terminal by \.{VFtoVP} when it examines that file). \yskip\hang\.{MAPFONT}. The value is a nonnegative integer followed by a property list. The integer represents an identifying number for fonts used in \.{MAP} attributes. The property list, which identifies the font and relative size, is defined below. \yskip\noindent And one additional ``virtual property'' is valid within a \.{CHARACTER}: \yskip\hang\.{MAP}. The value is a property list consisting of typesetting commands. Default is the single command \.{SETCHAR}~$c$, where $c$ is the current character number. @ The elements of a \.{MAPFONT} property list can be of the following types. \yskip\hang\.{FONTNAME} (string value, default is \.{NULL}). This is the font's identifying name. \yskip\hang\.{FONTAREA} (string value, default is empty). If the font appears in a nonstandard directory, according to local conventions, the directory name is given here. (This is system dependent, just as in \.{DVI} files.) \yskip\hang\.{FONTCHECKSUM} (four-byte value, default is zero). This value, which should be a nonnegative integer less than $2^{32}$, can be used to check that the font being referred to matches the intended font. If nonzero, it should equal the \.{CHECKSUM} parameter in that font. \yskip\hang\.{FONTAT} (numeric value, default is the \.{DESIGNUNITS} of the present virtual font). This value is relative to the design units of the present virtual font, hence it will be scaled when the virtual font is magnified or reduced. It represents the value that will effectively replace the design size of the font being referred to, so that all characters will be scaled appropriately. \yskip\hang\.{FONTDSIZE} (numeric value, default is 10). This value is absolute, in units of printer's points. It should equal the \.{DESIGNSIZE} parameter in the font being referred to. \yskip\noindent If any of the string values contain parentheses, the parentheses must be balanced. Leading blanks are removed from the strings, but trailing blanks are not. @ Finally, the elements of a \.{MAP} property list are an ordered sequence of typesetting commands chosen from among the following: \yskip\hang\.{SELECTFONT} (four-byte integer value). The value must be the number of a previously defined \.{MAPFONT}. This font (or more precisely, the final font that is mapped to that code number, if two \.{MAPFONT} properties happen to specify the same code) will be used in subsequent \.{SETCHAR} instructions until overridden by another \.{SELECTFONT}. The first-specified \.{MAPFONT} is implicitly selected before the first \.{SELECTFONT} in every character's map. \yskip\hang\.{SETCHAR} (integer value). There must be a character of this number in the currently selected font. (\.{VPtoVF} doesn't check that the character is valid, but \.{VFtoVP} does.) That character is typeset at the current position, and the typesetter moves right by the \.{CHARWD} in that character's \.{TFM} file. \yskip\hang\.{SETRULE} (two real values). The first value specifies height, the second specifies width, in design units. If both height and width are positive, a rule is typeset at the current position. Then the typesetter moves right, by the specified width. \yskip\hang\.{MOVERIGHT}, \.{MOVELEFT}, \.{MOVEUP}, \.{MOVEDOWN} (real value). The typesetter moves its current position by the number of design units specified. \yskip\hang\.{PUSH}. The current typesetter position is remembered, to be restored on a subsequent \.{POP}. \yskip\hang\.{POP}. The current typesetter position is reset to where it was on the most recent unmatched \.{PUSH}. The \.{PUSH} and \.{POP} commands in any \.{MAP} must be properly nested like balanced parentheses. \yskip\hang\.{SPECIAL} (string value). The subsequent characters, starting with the first nonblank and ending just before the first `\.)' that has no matching `\.(', are interpreted according to local conventions with the same system-dependent meaning as a `special' (\\{xxx}) command in a \.{DVI} file. \yskip\hang\.{SPECIALHEX} (hexadecimal string value). The subsequent nonblank characters before the next `\.)' must consist entirely of hexadecimal digits, and they must contain an even number of such digits. Each pair of hex digits specifies a byte, and this string of bytes is treated just as the value of a \.{SPECIAL}. (This convention permits arbitrary byte strings to be represented in an ordinary text file.) @ Virtual font mapping is a recursive process, like macro expansion. Thus, a \.{MAPFONT} might specify another virtual font, whose characters are themselves mapped to other fonts. As an example of this possibility, consider the following curious file called \.{recurse.vpl}, which defines a virtual font that is self-contained and self-referential: $$\vbox{\halign{\.{#}\cr (VTITLE Example of recursion)\cr (MAPFONT D 0 (FONTNAME recurse)(FONTAT D 2))\cr (CHARACTER C A (CHARWD D 1)(CHARHT D 1)(MAP (SETRULE D 1 D 1)))\cr (CHARACTER C B (CHARWD D 2)(CHARHT D 2)(MAP (SETCHAR C A)))\cr (CHARACTER C C (CHARWD D 4)(CHARHT D 4)(MAP (SETCHAR C B)))\cr }}$$ The design size is 10 points (the default), hence the character \.A in font \.{recurse} is a $10\times10$ point black square. Character \.B is typeset as character \.A in \.{recurse} {scaled} {2000}, hence it is a $20\times20$ point black square. And character \.C is typeset as character \.{B} in \.{recurse} {scaled} {2000}, hence its size is $40\times40$. Users are responsible for making sure that infinite recursion doesn't happen. @ So that is what \.{VPL} files hold. From these rules, you can guess (correctly) that \.{VPtoVF} operates in four main stages. First it assigns the default values to all properties; then it scans through the \.{VPL} file, changing property values as new ones are seen; then it checks the information and corrects any problems; and finally it outputs the \.{VF} and \.{TFM} files. @ The next question is, ``What are \.{VF} and \.{TFM} files?'' A complete answer to that question appears in the documentation of the companion programs, \.{VFtoVP} and \.{TFtoPL}, so the details will not be repeated here. Suffice it to say that a \.{VF} or \.{TFM} file stores all of the relevant font information in a sequence of 8-bit bytes. The number of bytes is always a multiple of 4, so we could regard the files as sequences of 32-bit words; but \TeX\ uses the byte interpretation, and so does \.{VPtoVF}. Note that the bytes are considered to be unsigned numbers. @= @!vf_file:packed file of 0..255; @!tfm_file:packed file of 0..255; @ On some systems you may have to do something special to write a packed file of bytes. For example, the following code didn't work when it was first tried at Stanford, because packed files have to be opened with a special switch setting on the \PASCAL\ that was used. @^system dependencies@> @= rewrite(vf_file); rewrite(tfm_file); @* Basic input routines. For the purposes of this program, a |byte| is an unsigned 16-bit quantity, and an |ASCII_code| is an integer between @'40 and @'177. Such ASCII codes correspond to one-character constants like \.{"A"} in \.{WEB} language. @= @!byte=0..65535; {unsigned 16-bit quantity} @!ASCII_code=@'40..@'177; {standard ASCII code numbers} @ One of the things \.{VPtoVF} has to do is convert characters of strings to ASCII form, since that is the code used for the family name and the coding scheme in a \.{TFM} file. An array |xord| is used to do the conversion from |char|; the method below should work with little or no change on most \PASCAL\ systems. @^system dependencies@> @d first_ord=0 {ordinal number of the smallest element of |char|} @d last_ord=127 {ordinal number of the largest element of |char|} @= @!xord:array[char] of ASCII_code; {conversion table} @ @= @!k:integer; {all-purpose initialization index} @ Characters that should not appear in \.{VPL} files (except in comments) are mapped into @'177. @d invalid_code=@'177 {code deserving an error message} @= for k:=first_ord to last_ord do xord[chr(k)]:=invalid_code; xord[' ']:=" "; xord['!']:="!"; xord['"']:=""""; xord['#']:="#"; xord['$']:="$"; xord['%']:="%"; xord['&']:="&"; xord['''']:="'"; xord['(']:="("; xord[')']:=")"; xord['*']:="*"; xord['+']:="+"; xord[',']:=","; xord['-']:="-"; xord['.']:="."; xord['/']:="/"; xord['0']:="0"; xord['1']:="1"; xord['2']:="2"; xord['3']:="3"; xord['4']:="4"; xord['5']:="5"; xord['6']:="6"; xord['7']:="7"; xord['8']:="8"; xord['9']:="9"; xord[':']:=":"; xord[';']:=";"; xord['<']:="<"; xord['=']:="="; xord['>']:=">"; xord['?']:="?"; xord['@@']:="@@"; xord['A']:="A"; xord['B']:="B"; xord['C']:="C"; xord['D']:="D"; xord['E']:="E"; xord['F']:="F"; xord['G']:="G"; xord['H']:="H"; xord['I']:="I"; xord['J']:="J"; xord['K']:="K"; xord['L']:="L"; xord['M']:="M"; xord['N']:="N"; xord['O']:="O"; xord['P']:="P"; xord['Q']:="Q"; xord['R']:="R"; xord['S']:="S"; xord['T']:="T"; xord['U']:="U"; xord['V']:="V"; xord['W']:="W"; xord['X']:="X"; xord['Y']:="Y"; xord['Z']:="Z"; xord['[']:="["; xord['\']:="\"; xord[']']:="]"; xord['^']:="^"; xord['_']:="_"; xord['`']:="`"; xord['a']:="a"; xord['b']:="b"; xord['c']:="c"; xord['d']:="d"; xord['e']:="e"; xord['f']:="f"; xord['g']:="g"; xord['h']:="h"; xord['i']:="i"; xord['j']:="j"; xord['k']:="k"; xord['l']:="l"; xord['m']:="m"; xord['n']:="n"; xord['o']:="o"; xord['p']:="p"; xord['q']:="q"; xord['r']:="r"; xord['s']:="s"; xord['t']:="t"; xord['u']:="u"; xord['v']:="v"; xord['w']:="w"; xord['x']:="x"; xord['y']:="y"; xord['z']:="z"; xord['{']:="{"; xord['|']:="|"; xord['}']:="}"; xord['~']:="~"; @ In order to help catch errors of badly nested parentheses, \.{VPtoVF} assumes that the user will begin each line with a number of blank spaces equal to some constant times the number of open parentheses at the beginning of that line. However, the program doesn't know in advance what the constant is, nor does it want to print an error message on every line for a user who has followed no consistent pattern of indentation. Therefore the following strategy is adopted: If the user has been consistent with indentation for ten or more lines, an indentation error will be reported. The constant of indentation is reset on every line that should have nonzero indentation. @= @!line:integer; {the number of the current line} @!good_indent:integer; {the number of lines since the last bad indentation} @!indent: integer; {the number of spaces per open parenthesis, zero if unknown} @!level: integer; {the current number of open parentheses} @ @= line:=0; good_indent:=0; indent:=0; level:=0; @ The input need not really be broken into lines of any maximum length, and we could read it character by character without any buffering. But we shall place it into a small buffer so that offending lines can be displayed in error messages. @= @!left_ln,@!right_ln:boolean; {are the left and right ends of the buffer at end-of-line marks?} @!limit:0..buf_size; {position of the last character present in the buffer} @!loc:0..buf_size; {position of the last character read in the buffer} @!buffer:array[1..buf_size] of char; @!input_has_ended:boolean; {there is no more input to read} @ @= limit:=0; loc:=0; left_ln:=true; right_ln:=true; input_has_ended:=false; @ Just before each \.{CHARACTER} property list is evaluated, the character code is printed in octal notation. Up to eight such codes appear on a line; so we have a variable to keep track of how many are currently there. @= @!chars_on_line:0..9; {the number of characters printed on the current line} @ @= chars_on_line:=0; @ The following routine prints an error message and an indication of where the error was detected. The error message should not include any final punctuation, since this procedure supplies its own. @d err_print(#)==begin if chars_on_line>0 then print_ln(' '); print(#); show_error_context; end @p procedure show_error_context; {prints the current scanner location} var k:0..buf_size; {an index into |buffer|} begin print_ln(' (line ',line:1,').'); if not left_ln then print('...'); for k:=1 to loc do print(buffer[k]); {print the characters already scanned} print_ln(' '); if not left_ln then print(' '); for k:=1 to loc do print(' '); {space out the second line} for k:=loc+1 to limit do print(buffer[k]); {print the characters yet unseen} if right_ln then print_ln(' ')@+else print_ln('...'); chars_on_line:=0; end; @ Here is a procedure that does the right thing when we are done reading the present contents of the buffer. It keeps |buffer[buf_size]| empty, in order to avoid range errors on certain \PASCAL\ compilers. An infinite sequence of right parentheses is placed at the end of the file, so that the program is sure to get out of whatever level of nesting it is in. On some systems it is desirable to modify this code so that tab marks in the buffer are replaced by blank spaces. (Simply setting |xord[chr(@'11)]:=" "| would not work; for example, two-line error messages would not come out properly aligned.) @^system dependencies@> @p procedure fill_buffer; begin left_ln:=right_ln; limit:=0; loc:=0; if left_ln then begin if line>0 then read_ln(vpl_file); incr(line); end; if eof(vpl_file) then begin limit:=1; buffer[1]:=')'; right_ln:=false; input_has_ended:=true; end else begin while (limit; end; end; @ The interesting part about |fill_buffer| is the part that learns what indentation conventions the user is following, if any. @d bad_indent(#)==begin if good_indent>=10 then err_print(#); good_indent:=0; indent:=0; end @= begin while (loc else if indent=0 then if loc mod level=0 then begin indent:=loc div level; good_indent:=1; end else good_indent:=0 else if indent*level=loc then incr(good_indent) else bad_indent('Warning: Inconsistent indentation; ', @.Warning: Inconsistent indentation...@> 'you are at parenthesis level ',level:1); end; end @* Basic scanning routines. The global variable |cur_char| holds the ASCII code corresponding to the character most recently read from the input buffer, or to a character that has been substituted for the real one. @= @!cur_char:ASCII_code; {we have just read this} @ Here is a procedure that sets |cur_char| to an ASCII code for the next character of input, if that character is a letter or digit or slash or \.>. Otherwise it sets |cur_char:=" "|, and the input system will be poised to reread the character that was rejected, whether or not it was a space. Lower case letters are converted to upper case. @p procedure get_keyword_char; begin while (loc=limit)and(not right_ln) do fill_buffer; if loc=limit then cur_char:=" " {end-of-line counts as a delimiter} else begin cur_char:=xord[buffer[loc+1]]; if cur_char>="a" then cur_char:=cur_char-@'40; if ((cur_char>="0")and(cur_char<="9")) then incr(loc) else if ((cur_char>="A")and(cur_char<="Z")) then incr(loc) else if cur_char="/" then incr(loc) else if cur_char=">" then incr(loc) else cur_char:=" "; end; end; @ The following procedure sets |cur_char| to the next character code, and converts lower case to upper case. If the character is a left or right parenthesis, it will not be ``digested''; the character will be read again and again, until the calling routine does something like `|incr(loc)|' to get past it. Such special treatment of parentheses insures that the structural information they contain won't be lost in the midst of other error recovery operations. @d backup==begin if (cur_char>")")or(cur_char<"(") then decr(loc); end {undoes the effect of |get_next|} @p procedure get_next; {sets |cur_char| to next, balks at parentheses} begin while loc=limit do fill_buffer; incr(loc); cur_char:=xord[buffer[loc]]; if cur_char>="a" then if cur_char<="z" then cur_char:=cur_char-@'40 {uppercasify} else begin if cur_char=invalid_code then begin err_print('Illegal character in the file'); @.Illegal character...@> cur_char:="?"; end; end else if (cur_char<=")")and(cur_char>="(") then decr(loc); end; @ Here's a procedure that scans a hexadecimal digit or a right parenthesis. @p function get_hex:byte; var @!a:integer; {partial result} begin repeat get_next; until cur_char<>" "; a:=cur_char-")"; if a>0 then begin a:=cur_char-"0"; if cur_char>"9" then if cur_char<"A" then a:=-1 else a:=cur_char-"A"+10; end; if (a<0)or(a>15) then begin err_print('Illegal hexadecimal digit'); get_hex:=0; @.Illegal hexadecimal digit@> end else get_hex:=a; end; @ The next procedure is used to ignore the text of a comment, or to pass over erroneous material. As such, it has the privilege of passing parentheses. It stops after the first right parenthesis that drops the level below the level in force when the procedure was called. @p procedure skip_to_end_of_item; var l:integer; {initial value of |level|} begin l:=level; while level>=l do begin while loc=limit do fill_buffer; incr(loc); if buffer[loc]=')' then decr(level) else if buffer[loc]='(' then incr(level); end; if input_has_ended then err_print('File ended unexpectedly: No closing ")"'); @.File ended unexpectedly...@> cur_char:=" "; {now the right parenthesis has been read and digested} end; @ A similar procedure copies the bytes remaining in an item. The copied bytes go into an array |vf| that we'll declare later. Leading blanks are ignored. @d vf_store(#)== begin vf[vf_ptr]:=#; if vf_ptr=vf_size then err_print('I''m out of memory---increase my vfsize!') @.I'm out of memory...@> else incr(vf_ptr); end @p procedure copy_to_end_of_item; label 30; var l:integer; {initial value of |level|} @!nonblank_found:boolean; {have we seen a nonblank character yet?} begin l:=level; nonblank_found:=false; while true do begin while loc=limit do fill_buffer; if buffer[loc+1]=')' then if level=l then goto 30@+else decr(level); incr(loc); if buffer[loc]='(' then incr(level); if buffer[loc]<>' ' then nonblank_found:=true; if nonblank_found then if xord[buffer[loc]]=invalid_code then begin err_print('Illegal character in the file'); @.Illegal character...@> vf_store("?"); end else vf_store(xord[buffer[loc]]); end; 30:end; @ Sometimes we merely want to skip past characters in the input until we reach a left or a right parenthesis. For example, we do this whenever we have finished scanning a property value and we hope that a right parenthesis is next (except for possible blank spaces). @d skip_to_paren==repeat get_next@;@+ until (cur_char="(")or(cur_char=")") @d skip_error(#)==begin err_print(#); skip_to_paren; end {this gets to the right parenthesis if something goes wrong} @d flush_error(#)==begin err_print(#); skip_to_end_of_item; end {this gets past the right parenthesis if something goes wrong} @ After a property value has been scanned, we want to move just past the right parenthesis that should come next in the input (except for possible blank spaces). @p procedure finish_the_property; {do this when the value has been scanned} begin while cur_char=" " do get_next; if cur_char<>")" then err_print('Junk after property value will be ignored'); @.Junk after property value...@> skip_to_end_of_item; end; @* Scanning property names. We have to figure out the meaning of names that appear in the \.{VPL} file, by looking them up in a dictionary of known keywords. Keyword number $n$ appears in locations |start[n]| through |start[n+1]-1| of an array called |dictionary|. @d max_name_index=300 {upper bound on the number of keywords} @d max_letters=3000 {upper bound on the total length of all keywords} @= @!start:array[1..max_name_index] of 0..max_letters; @!dictionary:array[0..max_letters] of ASCII_code; @!start_ptr:0..max_name_index; {the first available place in |start|} @!dict_ptr:0..max_letters; {the first available place in |dictionary|} @ @= start_ptr:=1; start[1]:=0; dict_ptr:=0; @ When we are looking for a name, we put it into the |cur_name| array. When we have found it, the corresponding |start| index will go into the global variable |name_ptr|. @d longest_name=20 {length of \.{DEFAULTRULETHICKNESS}} @= @!cur_name:array[1..longest_name] of ASCII_code; {a name to look up} @!name_length:0..longest_name; {its length} @!name_ptr:0..max_name_index; {its ordinal number in the dictionary} @ A conventional hash table with linear probing (cf.\ Algorithm 6.4L in {\sl The Art of Computer Pro\-gram\-ming\/}) is used for the dictionary operations. If |nhash[h]=0|, the table position is empty, otherwise |nhash[h]| points into the |start| array. @d hash_prime=307 {size of the hash table} @= @!nhash:array[0..hash_prime-1] of 0..max_name_index; @!cur_hash:0..hash_prime-1; {current position in the hash table} @ @= @!h:0..hash_prime-1; {runs through the hash table} @ @= for h:=0 to hash_prime-1 do nhash[h]:=0; @ Since there is no chance of the hash table overflowing, the procedure is very simple. After |lookup| has done its work, |cur_hash| will point to the place where the given name was found, or where it should be inserted. @p procedure lookup; {finds |cur_name| in the dictionary} var k:0..longest_name; {index into |cur_name|} @!j:0..max_letters; {index into |dictionary|} @!not_found:boolean; {clumsy thing necessary to avoid |goto| statement} @!cur_hash_reset:boolean; begin @; not_found:=true; cur_hash_reset:=false; while not_found do begin if (cur_hash=0) and (cur_hash_reset) then not_found:=false else begin if cur_hash=0 then begin cur_hash:=hash_prime-1; cur_hash_reset:=true end else decr(cur_hash); if nhash[cur_hash]=0 then not_found:=false else begin j:=start[nhash[cur_hash]]; if start[nhash[cur_hash]+1]=j+name_length then begin not_found:=false; for k:=1 to name_length do if dictionary[j+k-1]<>cur_name[k] then not_found:=true; end end end end; name_ptr:=nhash[cur_hash]; end; @ @= cur_hash:=cur_name[1]; for k:=2 to name_length do cur_hash:=(cur_hash+cur_hash+cur_name[k]) mod hash_prime @ The ``meaning'' of the keyword that begins at |start[k]| in the dictionary is kept in |equiv[k]|. The numeric |equiv| codes are given symbolic meanings by the following definitions. @d comment_code=0 @#{property names at the outer level} @d check_sum_code=1 @d design_size_code=2 @d design_units_code=3 @d coding_scheme_code=4 @d family_code=5 @d face_code=6 @d seven_bit_safe_flag_code=7 @d header_code= 8 @d font_dimen_code=9 @d lig_table_code=10 @d boundary_char_code=11 @d virtual_title_code=12 @d map_font_code=13 @d character_code=14 @d font_dir_code=15 @d n_font_dir_code=16 @d ofm_level_code=17 @d font_rule_code=18 @d font_glue_code=19 @d font_penalty_code=20 @d font_mvalue_code=21 @d font_fvalue_code=22 @d font_ivalue_code=23 @d char_repeat_code=24 @#{property names in a FONTDIMEN list} @d parameter_code=30 @#{property names in a CHARACTER list} @d char_info_code=70 @d width=1 @d height=2 @d depth=3 @d italic=4 @d sec_width=5 @d sec_height=6 @d sec_depth=7 @d sec_italic=8 @d accent=9 @d prim_top_axis=10 @d prim_top_axis_bis=11 @d prim_bot_axis=12 @d prim_bot_axis_bis=13 @d prim_mid_hor=14 @d prim_mid_vert=15 @d prim_base_slant=16 @d sec_top_axis=17 @d sec_top_axis_bis=18 @d sec_bot_axis=19 @d sec_bot_axis_bis=20 @d sec_mid_hor=21 @d sec_mid_vert=22 @d sec_base_slant=23 @d char_wd_code=char_info_code+width @d char_ht_code=char_info_code+height @d char_dp_code=char_info_code+depth @d char_ic_code=char_info_code+italic @d sec_width_code=char_info_code+sec_width @d sec_height_code=char_info_code+sec_height @d sec_depth_code=char_info_code+sec_depth @d sec_italic_code=char_info_code+sec_italic @d accent_code=char_info_code+accent @d prim_top_axis_code=char_info_code+prim_top_axis @d prim_top_axis_bis_code=char_info_code+prim_top_axis_bis @d prim_bot_axis_code=char_info_code+prim_bot_axis @d prim_bot_axis_bis_code=char_info_code+prim_bot_axis_bis @d prim_mid_hor_code=char_info_code+prim_mid_hor @d prim_mid_vert_code=char_info_code+prim_mid_vert @d prim_base_slant_code=char_info_code+prim_base_slant @d sec_top_axis_code=char_info_code+sec_top_axis @d sec_top_axis_bis_code=char_info_code+sec_top_axis_bis @d sec_bot_axis_code=char_info_code+sec_bot_axis @d sec_bot_axis_bis_code=char_info_code+sec_bot_axis_bis @d sec_mid_hor_code=char_info_code+sec_mid_hor @d sec_mid_vert_code=char_info_code+sec_mid_vert @d sec_base_slant_code=char_info_code+sec_base_slant @d next_larger_code=100 @d map_code=101 @d char_ivalue_code=111 @d char_fvalue_code=112 @d char_mvalue_code=113 @d char_rule_code=114 @d char_glue_code=115 @d char_penalty_code=116 @d var_char_code=117 @#{property names in a LIGTABLE list} @d label_code=130 @d stop_code=131 @d skip_code=132 @d krn_code=133 @d lig_code=134 @d clabel_code=150 @d cpen_code=151 @d cglue_code=152 @d cpenglue_code=153 @d ckrn_code=154 @#{property names in a FONTRULE list} @d rule_code=161 @d rule_width_code=162 @d rule_height_code=163 @d rule_depth_code=164 @#{property names in a FONTGLUE list} @d glue_code=171 @d glue_type_code=172 @d glue_stretch_order_code=173 @d glue_shrink_order_code=174 @d glue_width_code=175 @d glue_stretch_code=176 @d glue_shrink_code=177 @d glue_char_code=178 @d glue_rule_code=179 @#{property names in a FONTPENALTY list} @d penalty_code=191 @d penalty_val_code=192 @#{property names in a FONTMVALUE list} @d mvalue_code=193 @d mvalue_val_code=194 @#{property names in a FONTFVALUE list} @d fvalue_code=195 @d fvalue_val_code=196 @#{property names in a FONTIVALUE list} @d ivalue_code=197 @d ivalue_val_code=198 @#{property names in a MAPFONT list} @d font_name_code=200 @d font_area_code=201 @d font_checksum_code=202 @d font_at_code=203 @d font_dsize_code=204 @#{property names in a MAP list} @d select_font_code=210 @d set_char_code=211 @d set_rule_code=212 @d move_right_code=213 @d move_down_code=215 @d push_code=217 @d pop_code=218 @d special_code=219 @d special_hex_code=220 @= @!equiv:array[0..max_name_index] of byte; @!cur_code:byte; {equivalent most recently found in |equiv|} @ We have to get the keywords into the hash table and into the dictionary in the first place (sigh). The procedure that does this has the desired |equiv| code as a parameter. In order to facilitate \.{WEB} macro writing for the initialization, the keyword being initialized is placed into the last positions of |cur_name|, instead of the first positions. @p procedure enter_name(v:byte); {|cur_name| goes into the dictionary} var k:0..longest_name; begin for k:=1 to name_length do cur_name[k]:=cur_name[k+longest_name-name_length]; {now the name has been shifted into the correct position} lookup; {this sets |cur_hash| to the proper insertion place} nhash[cur_hash]:=start_ptr; equiv[start_ptr]:=v; for k:=1 to name_length do begin dictionary[dict_ptr]:=cur_name[k]; incr(dict_ptr); end; incr(start_ptr); start[start_ptr]:=dict_ptr; end; @ Here are the macros to load a name of up to 20 letters into the dictionary. For example, the macro |load5| is used for five-letter keywords. @d tail(#)==enter_name(#) @d t20(#)==cur_name[20]:=#;tail @d t19(#)==cur_name[19]:=#;t20 @d t18(#)==cur_name[18]:=#;t19 @d t17(#)==cur_name[17]:=#;t18 @d t16(#)==cur_name[16]:=#;t17 @d t15(#)==cur_name[15]:=#;t16 @d t14(#)==cur_name[14]:=#;t15 @d t13(#)==cur_name[13]:=#;t14 @d t12(#)==cur_name[12]:=#;t13 @d t11(#)==cur_name[11]:=#;t12 @d t10(#)==cur_name[10]:=#;t11 @d t9(#)==cur_name[9]:=#;t10 @d t8(#)==cur_name[8]:=#;t9 @d t7(#)==cur_name[7]:=#;t8 @d t6(#)==cur_name[6]:=#;t7 @d t5(#)==cur_name[5]:=#;t6 @d t4(#)==cur_name[4]:=#;t5 @d t3(#)==cur_name[3]:=#;t4 @d t2(#)==cur_name[2]:=#;t3 @d t1(#)==cur_name[1]:=#;t2 @d load2==name_length:=2;t19 @d load3==name_length:=3;t18 @d load4==name_length:=4;t17 @d load5==name_length:=5;t16 @d load6==name_length:=6;t15 @d load7==name_length:=7;t14 @d load8==name_length:=8;t13 @d load9==name_length:=9;t12 @d load10==name_length:=10;t11 @d load11==name_length:=11;t10 @d load12==name_length:=12;t9 @d load13==name_length:=13;t8 @d load14==name_length:=14;t7 @d load15==name_length:=15;t6 @d load16==name_length:=16;t5 @d load17==name_length:=17;t4 @d load18==name_length:=18;t3 @d load19==name_length:=19;t2 @d load20==name_length:=20;t1 @ (Thank goodness for keyboard macros in the text editor used to create this \.{WEB} file.) @= equiv[0]:=comment_code; {this is used after unknown keywords} load8("C")("H")("E")("C")("K")("S")("U")("M")(check_sum_code);@/ load10("D")("E")("S")("I")("G")("N")("S")("I")("Z")("E")(design_size_code);@/ load11("D")("E")("S")("I")("G")("N") ("U")("N")("I")("T")("S")(design_units_code);@/ load12("C")("O")("D")("I")("N")("G") ("S")("C")("H")("E")("M")("E")(coding_scheme_code);@/ load6("F")("A")("M")("I")("L")("Y")(family_code);@/ load4("F")("A")("C")("E")(face_code);@/ load16("S")("E")("V")("E")("N")("B")("I")("T")@/@t\hskip2em@> ("S")("A")("F")("E")("F")("L")("A")("G")(seven_bit_safe_flag_code);@/ load6("H")("E")("A")("D")("E")("R")(header_code);@/ load9("F")("O")("N")("T")("D")("I")("M")("E")("N")(font_dimen_code);@/ load8("L")("I")("G")("T")("A")("B")("L")("E")(lig_table_code);@/ load12("B")("O")("U")("N")("D")("A")("R")("Y")("C")("H")("A")("R") (boundary_char_code);@/ load9("C")("H")("A")("R")("A")("C")("T")("E")("R")(character_code);@/ load9("P")("A")("R")("A")("M")("E")("T")("E")("R")(parameter_code);@/ load6("C")("H")("A")("R")("W")("D")(char_wd_code);@/ load6("C")("H")("A")("R")("H")("T")(char_ht_code);@/ load6("C")("H")("A")("R")("D")("P")(char_dp_code);@/ load6("C")("H")("A")("R")("I")("C")(char_ic_code);@/ load5("S")("E")("C")("W")("D")(sec_width_code);@/ load5("S")("E")("C")("H")("T")(sec_height_code);@/ load5("S")("E")("C")("D")("P")(sec_depth_code);@/ load5("S")("E")("C")("I")("C")(sec_italic_code);@/ load6("A")("C")("C")("E")("N")("T")(accent_code);@/ load11("P")("R")("I")("M")("T")("O")("P")("A")("X")("I")("S")(prim_top_axis_code);@/ load14("P")("R")("I")("M")("T")("O")("P")("A")("X")("I")("S")("B")("I")("S")(prim_top_axis_bis_code);@/ load11("P")("R")("I")("M")("B")("O")("T")("A")("X")("I")("S")(prim_bot_axis_code);@/ load14("P")("R")("I")("M")("B")("O")("T")("A")("X")("I")("S")("B")("I")("S")(prim_bot_axis_bis_code);@/ load10("P")("R")("I")("M")("M")("I")("D")("H")("O")("R")(prim_mid_hor_code);@/ load10("P")("R")("I")("M")("M")("I")("D")("V")("E")("R")(prim_mid_vert_code);@/ load13("P")("R")("I")("M")("B")("A")("S")("E")("S")("L")("A")("N")("T")(prim_base_slant_code);@/ load10("S")("E")("C")("T")("O")("P")("A")("X")("I")("S")(sec_top_axis_code);@/ load13("S")("E")("C")("T")("O")("P")("A")("X")("I")("S")("B")("I")("S")(sec_top_axis_bis_code);@/ load10("S")("E")("C")("B")("O")("T")("A")("X")("I")("S")(sec_bot_axis_code);@/ load13("S")("E")("C")("B")("O")("T")("A")("X")("I")("S")("B")("I")("S")(sec_bot_axis_bis_code);@/ load9("S")("E")("C")("M")("I")("D")("H")("O")("R")(sec_mid_hor_code);@/ load9("S")("E")("C")("M")("I")("D")("V")("E")("R")(sec_mid_vert_code);@/ load12("S")("E")("C")("B")("A")("S")("E")("S")("L")("A")("N")("T")(sec_base_slant_code);@/ load10("N")("E")("X")("T")("L")("A")("R")("G")("E")("R")(next_larger_code);@/ load7("V")("A")("R")("C")("H")("A")("R")(var_char_code);@/ load3("T")("O")("P")(var_char_code+1);@/ load3("M")("I")("D")(var_char_code+2);@/ load3("B")("O")("T")(var_char_code+3);@/ load3("R")("E")("P")(var_char_code+4);@/ load3("E")("X")("T")(var_char_code+4); {compatibility with older \.{PL} format} load7("C")("O")("M")("M")("E")("N")("T")(comment_code);@/ load5("L")("A")("B")("E")("L")(label_code);@/ load4("S")("T")("O")("P")(stop_code);@/ load4("S")("K")("I")("P")(skip_code);@/ load3("K")("R")("N")(krn_code);@/ load3("L")("I")("G")(lig_code);@/ load4("/")("L")("I")("G")(lig_code+2);@/ load5("/")("L")("I")("G")(">")(lig_code+6);@/ load4("L")("I")("G")("/")(lig_code+1);@/ load5("L")("I")("G")("/")(">")(lig_code+5);@/ load5("/")("L")("I")("G")("/")(lig_code+3);@/ load6("/")("L")("I")("G")("/")(">")(lig_code+7);@/ load7("/")("L")("I")("G")("/")(">")(">")(lig_code+11);@/ load6("C")("L")("A")("B")("E")("L")(clabel_code);@/ load4("C")("P")("E")("N")(cpen_code);@/ load5("C")("G")("L")("U")("E")(cglue_code);@/ load8("C")("P")("E")("N")("G")("L")("U")("E")(cpenglue_code);@/ load4("C")("K")("R")("N")(ckrn_code);@/ load8("O")("F")("M")("L")("E")("V")("E")("L")(ofm_level_code);@/ load7("F")("O")("N")("T")("D")("I")("R")(font_dir_code);@/ load8("N")("F")("O")("N")("T")("D")("I")("R")(n_font_dir_code);@/ load14("N")("A")("T")("U")("R")("A")("L")("F")("O")("N")("T")("D")("I")("R")(n_font_dir_code); {compatibility with \.{omegafonts} (\.{C}) version} load10("C")("H")("A")("R")("R")("E")("P")("E")("A")("T")(char_repeat_code);@/ load10("C")("H")("A")("R")("I")("V")("A")("L")("U")("E")(char_ivalue_code);@/ load10("C")("H")("A")("R")("F")("V")("A")("L")("U")("E")(char_fvalue_code);@/ load10("C")("H")("A")("R")("M")("V")("A")("L")("U")("E")(char_mvalue_code);@/ load8("C")("H")("A")("R")("R")("U")("L")("E")(char_rule_code);@/ load8("C")("H")("A")("R")("G")("L")("U")("E")(char_glue_code);@/ load11("C")("H")("A")("R")("P")("E")("N")("A")("L")("T")("Y")(char_penalty_code);@/ load8("F")("O")("N")("T")("R")("U")("L")("E")(font_rule_code);@/ load4("R")("U")("L")("E")(rule_code);@/ load6("R")("U")("L")("E")("W")("D")(rule_width_code);@/ load6("R")("U")("L")("E")("H")("T")(rule_height_code);@/ load6("R")("U")("L")("E")("D")("P")(rule_depth_code);@/ load8("F")("O")("N")("T")("G")("L")("U")("E")(font_glue_code);@/ load4("G")("L")("U")("E")(glue_code);@/ load8("G")("L")("U")("E")("T")("Y")("P")("E")(glue_type_code);@/ load16("G")("L")("U")("E")("S")("T")("R")("E")("T")("C")("H")("O")("R")("D")("E")("R")(glue_stretch_order_code);@/ load15("G")("L")("U")("E")("S")("H")("R")("I")("N")("K")("O")("R")("D")("E")("R")(glue_shrink_order_code);@/ load8("G")("L")("U")("E")("R")("U")("L")("E")(glue_rule_code);@/ load8("G")("L")("U")("E")("C")("H")("A")("R")(glue_char_code);@/ load6("G")("L")("U")("E")("W")("D")(glue_width_code);@/ load11("G")("L")("U")("E")("S")("T")("R")("E")("T")("C")("H")(glue_stretch_code);@/ load10("G")("L")("U")("E")("S")("H")("R")("I")("N")("K")(glue_shrink_code);@/ load11("F")("O")("N")("T")("P")("E")("N")("A")("L")("T")("Y")(font_penalty_code);@/ load7("P")("E")("N")("A")("L")("T")("Y")(penalty_code);@/ load10("P")("E")("N")("A")("L")("T")("Y")("V")("A")("L")(penalty_val_code);@/ load10("F")("O")("N")("T")("M")("V")("A")("L")("U")("E")(font_mvalue_code);@/ load6("M")("V")("A")("L")("U")("E")(mvalue_code);@/ load9("M")("V")("A")("L")("U")("E")("V")("A")("L")(mvalue_val_code);@/ load10("F")("O")("N")("T")("F")("V")("A")("L")("U")("E")(font_fvalue_code);@/ load6("F")("V")("A")("L")("U")("E")(fvalue_code);@/ load9("F")("V")("A")("L")("U")("E")("V")("A")("L")(fvalue_val_code);@/ load10("F")("O")("N")("T")("I")("V")("A")("L")("U")("E")(font_ivalue_code);@/ load6("I")("V")("A")("L")("U")("E")(ivalue_code);@/ load9("I")("V")("A")("L")("U")("E")("V")("A")("L")(ivalue_val_code);@/ @ \.{VPL} files may contain the following in addition to the \.{PL} names. @= load6("V")("T")("I")("T")("L")("E")(virtual_title_code);@/ load7("M")("A")("P")("F")("O")("N")("T")(map_font_code);@/ load3("M")("A")("P")(map_code);@/ load8("F")("O")("N")("T")("N")("A")("M")("E")(font_name_code);@/ load8("F")("O")("N")("T")("A")("R")("E")("A")(font_area_code);@/ load12("F")("O")("N")("T") ("C")("H")("E")("C")("K")("S")("U")("M")(font_checksum_code);@/ load6("F")("O")("N")("T")("A")("T")(font_at_code);@/ load9("F")("O")("N")("T")("D")("S")("I")("Z")("E")(font_dsize_code);@/ load10("S")("E")("L")("E")("C")("T")("F")("O")("N")("T")(select_font_code);@/ load7("S")("E")("T")("C")("H")("A")("R")(set_char_code);@/ load7("S")("E")("T")("R")("U")("L")("E")(set_rule_code);@/ load9("M")("O")("V")("E")("R")("I")("G")("H")("T")(move_right_code);@/ load8("M")("O")("V")("E")("L")("E")("F")("T")(move_right_code+1);@/ load8("M")("O")("V")("E")("D")("O")("W")("N")(move_down_code);@/ load6("M")("O")("V")("E")("U")("P")(move_down_code+1);@/ load4("P")("U")("S")("H")(push_code);@/ load3("P")("O")("P")(pop_code);@/ load7("S")("P")("E")("C")("I")("A")("L")(special_code);@/ load10("S")("P")("E")("C")("I")("A")("L")("H")("E")("X")(special_hex_code);@/ @ @= load5("S")("L")("A")("N")("T")(parameter_code+1);@/ load5("S")("P")("A")("C")("E")(parameter_code+2);@/ load7("S")("T")("R")("E")("T")("C")("H")(parameter_code+3);@/ load6("S")("H")("R")("I")("N")("K")(parameter_code+4);@/ load7("X")("H")("E")("I")("G")("H")("T")(parameter_code+5);@/ load4("Q")("U")("A")("D")(parameter_code+6);@/ load10("E")("X")("T")("R")("A")("S")("P")("A")("C")("E")(parameter_code+7);@/ load4("N")("U")("M")("1")(parameter_code+8);@/ load4("N")("U")("M")("2")(parameter_code+9);@/ load4("N")("U")("M")("3")(parameter_code+10);@/ load6("D")("E")("N")("O")("M")("1")(parameter_code+11);@/ load6("D")("E")("N")("O")("M")("2")(parameter_code+12);@/ load4("S")("U")("P")("1")(parameter_code+13);@/ load4("S")("U")("P")("2")(parameter_code+14);@/ load4("S")("U")("P")("3")(parameter_code+15);@/ load4("S")("U")("B")("1")(parameter_code+16);@/ load4("S")("U")("B")("2")(parameter_code+17);@/ load7("S")("U")("P")("D")("R")("O")("P")(parameter_code+18);@/ load7("S")("U")("B")("D")("R")("O")("P")(parameter_code+19);@/ load6("D")("E")("L")("I")("M")("1")(parameter_code+20);@/ load6("D")("E")("L")("I")("M")("2")(parameter_code+21);@/ load10("A")("X")("I")("S")("H")("E")("I")("G")("H")("T")(parameter_code+22);@/ load20("D")("E")("F")("A")("U")("L")("T")("R")("U")("L")("E")@/@t\hskip2em@> ("T")("H")("I")("C")("K")("N")("E")("S")("S")(parameter_code+8);@/ load13("B")("I")("G")("O")("P") ("S")("P")("A")("C")("I")("N")("G")("1")(parameter_code+9);@/ load13("B")("I")("G")("O")("P") ("S")("P")("A")("C")("I")("N")("G")("2")(parameter_code+10);@/ load13("B")("I")("G")("O")("P") ("S")("P")("A")("C")("I")("N")("G")("3")(parameter_code+11);@/ load13("B")("I")("G")("O")("P") ("S")("P")("A")("C")("I")("N")("G")("4")(parameter_code+12);@/ load13("B")("I")("G")("O")("P") ("S")("P")("A")("C")("I")("N")("G")("5")(parameter_code+13);@/ @ When a left parenthesis has been scanned, the following routine is used to interpret the keyword that follows, and to store the equivalent value in |cur_code|. @p procedure get_name; begin incr(loc); incr(level); {pass the left parenthesis} cur_char:=" "; while cur_char=" " do get_next; if (cur_char>")")or(cur_char<"(") then decr(loc); {back up one character} name_length:=0; get_keyword_char; {prepare to scan the name} while cur_char<>" " do begin if name_length=longest_name then cur_name[1]:="X" {force error} else incr(name_length); cur_name[name_length]:=cur_char; get_keyword_char; end; lookup; if name_ptr=0 then err_print('Sorry, I don''t know that property name'); @.Sorry, I don't know...@> cur_code:=equiv[name_ptr]; end; @* Scanning numeric data. The next thing we need is a trio of subroutines to read the one-byte, four-byte, and real numbers that may appear as property values. These subroutines are careful to stick to numbers between $-2^{31}$ and $2^{31}-1$, inclusive, so that a computer with two's complement 32-bit arithmetic will not be interrupted by overflow. @ The first number scanner, which returns a one-byte value, surely has no problems of arithmetic overflow. @p function get_byte:byte; {scans a one-byte property value} var acc:integer; {an accumulator} @!t:ASCII_code; {the type of value to be scanned} begin repeat get_next; until cur_char<>" "; {skip the blanks before the type code} t:=cur_char; acc:=0; repeat get_next; until cur_char<>" "; {skip the blanks after the type code} if t="C" then @ else if t="D" then @ else if t="O" then @ else if t="H" then @ else if t="F" then @ else skip_error('You need "C" or "D" or "O" or "H" or "F" here'); @.You need "C" or "D" ...here@> cur_char:=" "; get_byte:=acc; end; @ The |get_next| routine converts lower case to upper case, but it leaves the character in the buffer, so we can unconvert it. @= if (cur_char>=@'41)and(cur_char<=@'176)and ((cur_char<"(")or(cur_char>")")) then acc:=xord[buffer[loc]] else skip_error('"C" value must be standard ASCII and not a paren') @:C value}\.{"C" value must be...@> @ @= begin while (cur_char>="0")and(cur_char<="9") do begin acc:=acc*10+cur_char-"0"; if acc>char_max then begin skip_error('This value shouldn''t exceed 65535'); @.This value shouldn't...@> acc:=0; cur_char:=" "; end else get_next; end; backup; end @ @= begin while (cur_char>="0")and(cur_char<="7") do begin acc:=acc*8+cur_char-"0"; if acc>char_max then begin skip_error('This value shouldn''t exceed ''177777'); @.This value shouldn't...@> acc:=0; cur_char:=" "; end else get_next; end; backup; end @ @= begin while ((cur_char>="0")and(cur_char<="9"))or ((cur_char>="A")and(cur_char<="F")) do begin if cur_char>="A" then cur_char:=cur_char+"0"+10-"A"; acc:=acc*16+cur_char-"0"; if acc>char_max then begin skip_error('This value shouldn''t exceed "FFFF'); @.This value shouldn't...@> acc:=0; cur_char:=" "; end else get_next; end; backup; end @ @= begin if cur_char="B" then acc:=2 else if cur_char="L" then acc:=4 else if cur_char<>"M" then acc:=18; get_next; if cur_char="I" then incr(acc) else if cur_char<>"R" then acc:=18; get_next; if cur_char="C" then acc:=acc+6 else if cur_char="E" then acc:=acc+12 else if cur_char<>"R" then acc:=18; if acc>=18 then begin skip_error('Illegal face code, I changed it to MRR'); @.Illegal face code...@> acc:=0; end; end @ The routine that scans a four-byte value puts its output into |cur_bytes|, which is a record containing (yes, you guessed it) four bytes. @= @!four_bytes=record @!b0:byte;@+@!b1:byte;@+@!b2:byte;@+@!b3:byte;@+end; @ @d c0==cur_bytes.b0 @d c1==cur_bytes.b1 @d c2==cur_bytes.b2 @d c3==cur_bytes.b3 @= @!cur_bytes:four_bytes; {a four-byte accumulator} @!zero_bytes:four_bytes; {four bytes all zero} @ @= zero_bytes.b0:=0; zero_bytes.b1:=0; zero_bytes.b2:=0; zero_bytes.b3:=0; @ Since the |get_four_bytes| routine is used very infrequently, no attempt has been made to make it fast; we only want it to work. This is no longer the case, but we hope it's not too slow. @p procedure get_four_bytes; {scans an unsigned constant and sets |four_bytes|} var c:integer; {local two-byte accumulator} @!r:integer; {radix} begin repeat get_next; until cur_char<>" "; {skip the blanks before the type code} r:=0; cur_bytes:=zero_bytes; {start with the accumulator zero} if cur_char="H" then r:=16 else if cur_char="O" then r:=8 else if cur_char="D" then r:=10 else skip_error('Decimal ("D"), octal ("O"), or hex ("H") value needed here'); @.Decimal ("D"), octal ("O"), or hex...@> if r>0 then begin repeat get_next; until cur_char<>" "; {skip the blanks after the type code} while ((cur_char>="0")and(cur_char<="9"))or@| ((cur_char>="A")and(cur_char<="F")) do @; end; end; function get_integer:integer; {scans an integer property value} var @!a:integer; {accumulator} begin get_four_bytes; a:=c0; if a>=@"80 then a:=a-@"100; get_integer:=(a*@"1000000)+(c1*@"10000)+(c2*@"100)+c3; end; @ @= begin if cur_char>="A" then cur_char:=cur_char+"0"+10-"A"; if cur_char>="0"+r then skip_error('Illegal digit') @.Illegal digit@> else begin c:=c3*r+cur_char-"0"; c3:=c mod 256;@/ c:=c2*r+c div 256; c2:=c mod 256;@/ c:=c1*r+c div 256; c1:=c mod 256;@/ c:=c0*r+c div 256; if c<256 then c0:=c else begin cur_bytes:=zero_bytes; if r=8 then skip_error('Sorry, the maximum octal value is O 37777777777') @.Sorry, the maximum...@> else if r=10 then skip_error('Sorry, the maximum decimal value is D 4294967295') else skip_error('Sorry, the maximum hex value is H FFFFFFFF'); end; get_next; end; end @ The remaining scanning routine is the most interesting. It scans a real constant and returns the nearest |fix_word| approximation to that constant. A |fix_word| is a 32-bit integer that represents a real value that has been multiplied by $2^{20}$. Since \.{VPtoVF} restricts the magnitude of reals to 2048, the |fix_word| will have a magnitude less than $2^{31}$. @d unity==@'4000000 {$2^{20}$, the |fix_word| 1.0} @= @!fix_word=integer; {a scaled real value with 20 bits of fraction} @!unsigned_integer=integer; @ When a real value is desired, we might as well treat `\.D' and `\.R' formats as if they were identical. @p function get_fix:fix_word; {scans a real property value} var negative:boolean; {was there a minus sign?} @!acc:integer; {an accumulator} @!int_part:integer; {the integer part} @!j:0..7; {the number of decimal places stored} begin repeat get_next; until cur_char<>" "; {skip the blanks before the type code} negative:=false; acc:=0; {start with the accumulators zero} if (cur_char<>"R")and(cur_char<>"D") then skip_error('An "R" or "D" value is needed here') @.An "R" or "D" ... needed here@> else begin @; while (cur_char>="0") and (cur_char<="9") do @; int_part:=acc; acc:=0; if cur_char="." then @; if (acc>=unity)and(int_part=2047) then skip_error('Real constants must be less than 2048') @.Real constants must be...@> else acc:=int_part*unity+acc; end; if negative then get_fix:=-acc@+else get_fix:=acc; end; @ @= repeat get_next; if cur_char="-" then begin cur_char:=" "; negative:=not negative; end else if cur_char="+" then cur_char:=" "; until cur_char<>" " @ @= begin acc:=acc*10+cur_char-"0"; if acc>=2048 then begin skip_error('Real constants must be less than 2048'); @.Real constants must be...@> acc:=0; cur_char:=" "; end else get_next; end @ To scan the fraction $.d_1d_2\ldots\,$, we keep track of up to seven of the digits $d_j$. A correct result is obtained if we first compute $f^\prime=\lfloor 2^{21}(d_1\ldots d_j)/10^j\rfloor$, after which $f=\lfloor(f^\prime+1)/2\rfloor$. It is possible to have $f=1.0$. @= @!fraction_digits:array[1..7] of integer; {$2^{21}$ times $d_j$} @ @= begin j:=0; get_next; while (cur_char>="0")and(cur_char<="9") do begin if j<7 then begin incr(j); fraction_digits[j]:=@'10000000*(cur_char-"0"); end; get_next; end; acc:=0; while j>0 do begin acc:=fraction_digits[j]+(acc div 10); decr(j); end; acc:=(acc+10) div 20; end @* Storing the property values. When property values have been found, they are squirreled away in a bunch of arrays. The header information is unpacked into bytes in an array called |header_bytes|. The ligature/kerning program is stored in an array of type |four_bytes|. Another |four_bytes| array holds the specifications of extensible characters. The kerns and parameters are stored in separate arrays of |fix_word| values. Virtual font data goes into an array |vf| of single-byte values. We maintain information about at most |max_font+1| local fonts. Instead of storing the design size in the header array, we will keep it in a |fix_word| variable until the last minute. The number of units in the design size is also kept in a |fix_word|. @= @!header_bytes:array[header_index] of byte; {the header block} @!header_ptr:header_index; {the number of header bytes in use} @!design_size:fix_word; {the design size} @!design_units:fix_word; {reciprocal of the scaling factor} @!frozen_du:boolean; {have we used |design_units| irrevocably?} @!seven_bit_safe_flag:boolean; {does the file claim to be seven-bit-safe?} @!lig_kern:array[0..max_lig_steps] of four_bytes; {the ligature program} @!nl:unsigned_integer; {the number of ligature/kern instructions so far} @!min_nl:unsigned_integer; {the final value of |nl| must be at least this} @!kern:array[0..max_kerns] of fix_word; {the distinct kerning amounts} @!nk:0..max_kerns; {the number of entries of |kern|} @!exten:array[char_type] of four_bytes; {extensible character specs} @!ne:xchar_type; {the number of extensible characters} @!param:array[1..max_param_words] of fix_word; {\.{FONTDIMEN} parameters} @!np:0..max_param_words; {the largest parameter set nonzero} @!check_sum_specified:boolean; {did the user name the check sum?} @!bchar:xchar_type; {right boundary character, |xmax_char| if unspecified} @!font_dir:integer; {font direction} @!vf:array[0..vf_size] of byte; {stored bytes for \.{VF} file} @!vf_ptr:0..vf_size; {first unused location in |vf|} @!vtitle_start:0..vf_size; {starting location of \.{VTITLE} string} @!vtitle_length:byte; {length of \.{VTITLE} string} @!packet_start:array[char_type] of 0..vf_size; {beginning location of character packet} @!packet_length:array[char_type] of integer; {length of character packet} @!font_ptr:xfont_type; {number of distinct local fonts seen} @!cur_font:xfont_type; {number of the current local font} @!fname_start:array[font_type] of 0..vf_size; {beginning of local font name} @!fname_length:array[font_type] of byte; {length of local font name} @!farea_start:array[font_type] of 0..vf_size; {beginning of local font area} @!farea_length:array[font_type] of byte; {length of local font area} @!font_checksum:array[font_type] of four_bytes; {local font checksum} @!font_number:array[xfont_type] of integer; {local font id number} @!font_at:array[font_type] of fix_word; {local font ``at size''} @!font_dsize:array[font_type] of fix_word; {local font design size} @ @= @!char_type=0..max_char; @!xchar_type=0..xmax_char; @!xxchar_type=0..xxmax_char; @!font_type=0..max_font; @!xfont_type=0..xmax_font; @!header_index=0..max_header_bytes; @!indx=xxchar_type; @ @= @!d:header_index; {an index into |header_bytes|} @ We start by setting up the default values. @d check_sum_loc=0 @d design_size_loc=4 @d coding_scheme_loc=8 @d family_loc=coding_scheme_loc+40 @d seven_flag_loc=family_loc+20 @d face_loc=seven_flag_loc+3 @= for d:=0 to 18*4-1 do header_bytes[d]:=0; header_bytes[8]:=11; header_bytes[9]:="U"; header_bytes[10]:="N"; header_bytes[11]:="S"; header_bytes[12]:="P"; header_bytes[13]:="E"; header_bytes[14]:="C"; header_bytes[15]:="I"; header_bytes[16]:="F"; header_bytes[17]:="I"; header_bytes[18]:="E"; header_bytes[19]:="D"; @.UNSPECIFIED@> for d:=family_loc to family_loc+11 do header_bytes[d]:=header_bytes[d-40]; design_size:=10*unity; design_units:=unity; frozen_du:=false; seven_bit_safe_flag:=false;@/ header_ptr:=18*4; nl:=0; min_nl:=0; nk:=0; ne:=0; np:=0;@/ check_sum_specified:=false; bchar:=xmax_char;@/ font_dir:=0; vf_ptr:=0; vtitle_start:=0; vtitle_length:=0; font_ptr:=0; for k:=0 to max_char do packet_start[k]:=vf_size; for k:=0 to 127 do packet_length[k]:=1; for k:=128 to 255 do packet_length[k]:=2; for k:=256 to max_char do packet_length[k]:=3; @ Most of the dimensions, however, go into the |memory| array. There are at most |max_char+2| widths, |max_char+2| heights, |max_char+2| depths, and |max_char+2| italic corrections, since the value 0 is required but it need not be used. So |memory| has room for |4*max_char+8| entries, each of which is a |fix_word|. An auxiliary table called |link| is used to link these words together in linear lists, so that sorting and other operations can be done conveniently. We also add four ``list head'' words to the |memory| and |link| arrays; these are in locations |width| through |italic|, i.e., 1 through 4. For example, |link[height]| points to the smallest element in the sorted list of distinct heights that have appeared so far, and |memory[height]| is the number of distinct heights. @= @!pointer=0..mem_size; {an index into memory} @ The arrays |char_wd|, |char_ht|, |char_dp|, and |char_ic| contain pointers to the |memory| array entries where the corresponding dimensions appear. Two other arrays, |char_tag| and |char_remainder|, hold the other information that \.{TFM} files pack into a |char_info_word|. @d no_tag=0 {vanilla character} @d lig_tag=1 {character has a ligature/kerning program} @d list_tag=2 {character has a successor in a charlist} @d ext_tag=3 {character is extensible} @d bchar_label==char_remainder[xmax_char] {beginning of ligature program for left boundary} @= @!memory:array[pointer] of fix_word; {character dimensions and kerns} @!mem_ptr:pointer; {largest |memory| word in use} @!link:array[pointer] of pointer; {to make lists of |memory| items} @!char_wd:array[char_type] of pointer; {pointers to the widths} @!char_ht:array[char_type] of pointer; {pointers to the heights} @!char_dp:array[char_type] of pointer; {pointers to the depths} @!char_ic:array[char_type] of pointer; {pointers to italic corrections} @!char_tag:array[char_type] of no_tag..ext_tag; {character tags} @!char_remainder:array[xchar_type] of xchar_type; {pointers to ligature labels, next larger characters, or extensible characters} @!top_width,@!top_height,@!top_depth,@!top_italic:integer; @ @= @!c:integer; {runs through all character codes} @ @= bchar_label:=xmax_label; for c:=0 to max_char do begin char_wd[c]:=0; char_ht[c]:=0; char_dp[c]:=0; char_ic[c]:=0;@/ char_tag[c]:=no_tag; char_remainder[c]:=0; end; memory[0]:=@'17777777777; {an ``infinite'' element at the end of the lists} memory[width]:=0; link[width]:=0; {width list is empty} memory[height]:=0; link[height]:=0; {height list is empty} memory[depth]:=0; link[depth]:=0; {depth list is empty} memory[italic]:=0; link[italic]:=0; {italic list is empty} mem_ptr:=italic; @ As an example of these data structures, let us consider the simple routine that inserts a potentially new element into one of the dimension lists. The first parameter indicates the list head (i.e., |h=width| for the width list, etc.); the second parameter is the value that is to be inserted into the list if it is not already present. The procedure returns the value of the location where the dimension appears in |memory|. The fact that |memory[0]| is larger than any legal dimension makes the algorithm particularly short. We do have to handle two somewhat subtle situations. A width of zero must be put into the list, so that a zero-width character in the font will not appear to be nonexistent (i.e., so that its |char_wd| index will not be zero), but this does not need to be done for heights, depths, or italic corrections. Furthermore, it is necessary to test for memory overflow even though we have provided room for the maximum number of different dimensions in any legal font, since the \.{VPL} file might foolishly give any number of different sizes to the same character. @p function sort_in(@!h:pointer;@!d:fix_word):pointer; {inserts into list} var p:pointer; {the current node of interest} begin if (d=0)and(h<>width) then sort_in:=0 else begin p:=h; while d>=memory[link[p]] do p:=link[p]; if (d=memory[p])and(p<>h) then sort_in:=p else if mem_ptr=mem_size then begin err_print('Memory overflow: too many widths, etc'); @.Memory overflow...@> print_ln('Congratulations! It''s hard to make this error.'); sort_in:=p; end else begin incr(mem_ptr); memory[mem_ptr]:=d; link[mem_ptr]:=link[p]; link[p]:=mem_ptr; incr(memory[h]); sort_in:=mem_ptr; end; end; end; @ When these lists of dimensions are eventually written to the \.{OFM} file, we may have to do some rounding of values, because the \.{OFM} file allows at most 65536 widths, 256 heights, 256 depths, and 256 italic corrections. The following procedure takes a given list head |h| and a given dimension |d|, and returns the minimum $m$ such that the elements of the list can be covered by $m$ intervals of width $d$. It also sets |next_d| to the smallest value $d^\prime>d$ such that the covering found by this procedure would be different. In particular, if $d=0$ it computes the number of elements of the list, and sets |next_d| to the smallest distance between two list elements. (The covering by intervals of width |next_d| is not guaranteed to have fewer than $m$ elements, but in practice this seems to happen most of the time.) @= @!next_d:fix_word; {the next larger interval that is worth trying} @ Once again we can make good use of the fact that |memory[0]| is ``infinite.'' @p function min_cover(@!h:pointer;@!d:fix_word):integer; var p:pointer; {the current node of interest} @!l:fix_word; {the least element covered by the current interval} @!m:integer; {the current size of the cover being generated} begin m:=0; p:=link[h]; next_d:=memory[0]; while p<>0 do begin incr(m); l:=memory[p]; while memory[link[p]]<=l+d do p:=link[p]; p:=link[p]; if memory[p]-lm then begin excess:=memory[h]-m; k:=min_cover(h,0); d:=next_d; {now the answer is at least |d|} repeat d:=d+d; k:=min_cover(h,d); until k<=m; {first we ascend rapidly until finding the range} d:=d div 2; k:=min_cover(h,d); {now we run through the feasible steps} while k>m do begin d:=next_d; k:=min_cover(h,d); end; shorten:=d; end else shorten:=0; end; @ When we are nearly ready to output the \.{TFM} file, we will set |index[p]:=k| if the dimension in |memory[p]| is being rounded to the |k|th element of its list. @= @!index:array[pointer] of byte; @!excess:byte; {number of words to remove, if list is being shortened} @ Here is the procedure that sets the |index| values. It also shortens the list so that there is only one element per covering interval; the remaining elements are the midpoints of their clusters. @p procedure set_indices(@!h:pointer;@!d:fix_word); {reduces and indexes a list} var p:pointer; {the current node of interest} @!q:pointer; {trails one step behind |p|} @!m:byte; {index number of nodes in the current interval} @!l:fix_word; {least value in the current interval} begin q:=h; p:=link[q]; m:=0; while p<>0 do begin incr(m); l:=memory[p]; index[p]:=m; while memory[link[p]]<=l+d do begin p:=link[p]; index[p]:=m; decr(excess); if excess=0 then d:=0; end; link[q]:=p; memory[p]:=l+(memory[p]-l) div 2; q:=p; p:=link[p]; end; memory[h]:=m; end; @* The input phase. We're ready now to read and parse the \.{VPL} file, storing property values as we go. @= @!c:integer; {the current character or byte being processed} @!cprime:char_type; {Processing for several characters together} @!crange:char_type; {ditto} @!x:fix_word; {current dimension of interest} @!k:integer; {general-purpose index} @ @= cur_char:=" "; repeat while cur_char=" " do get_next; if cur_char="(" then @ else if (cur_char=")")and not input_has_ended then begin err_print('Extra right parenthesis'); incr(loc); cur_char:=" "; end @.Extra right parenthesis@> else if not input_has_ended then junk_error; until input_has_ended @ The |junk_error| routine just referred to is called when something appears in the forbidden area between properties of a property list. @p procedure junk_error; {gets past no man's land} begin err_print('There''s junk here that is not in parentheses'); @.There's junk here...@> skip_to_paren; end; @ For each font property, we are supposed to read the data from the left parenthesis that is the current value of |cur_char| to the right parenthesis that matches it in the input. The main complication is to recover with reasonable grace from various error conditions that might arise. @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code>char_repeat_code then flush_error('This property name doesn''t belong on the outer level') @.This property name doesn't belong...@> else begin @; finish_the_property; end; end @ @= case cur_code of check_sum_code: begin check_sum_specified:=true; read_four_bytes(check_sum_loc); end; design_size_code: @; design_units_code: @; coding_scheme_code: read_BCPL(coding_scheme_loc,40); family_code: read_BCPL(family_loc,20); face_code: begin c:=get_byte; if c>255 then begin err_print('FACE clipped to 255'); c:=255 end; header_bytes[face_loc]:=c end; seven_bit_safe_flag_code: @; header_code: @; font_dimen_code: @; lig_table_code: read_lig_kern; boundary_char_code: bchar:=get_byte; virtual_title_code: begin vtitle_start:=vf_ptr; copy_to_end_of_item; if vf_ptr>vtitle_start+255 then begin err_print('VTITLE clipped to 255 characters'); vtitle_length:=255; @.VTITLE clipped...@> end else vtitle_length:=vf_ptr-vtitle_start; end; map_font_code:@; character_code: read_char_info; ofm_level_code: @; font_dir_code: @; n_font_dir_code: @; char_repeat_code: read_repeated_character_info; font_rule_code: read_font_rule_list; font_glue_code: read_font_glue_list; font_penalty_code: read_font_penalty_list; font_mvalue_code: read_font_mvalue_list; font_fvalue_code: read_font_fvalue_list; font_ivalue_code: read_font_ivalue_list; end @ The |case| statement just given makes use of three subroutines that we haven't defined yet. The first of these puts a 32-bit octal quantity into four specified bytes of the header block. @p procedure read_four_bytes(l:header_index); begin get_four_bytes; header_bytes[l]:=c0; header_bytes[l+1]:=c1; header_bytes[l+2]:=c2; header_bytes[l+3]:=c3; end; @ The second little procedure is used to scan a string and to store it in the ``{\mc BCPL} format'' required by \.{TFM} files. The string is supposed to contain at most |n| bytes, including the first byte (which holds the length of the rest of the string). @p procedure read_BCPL(l:header_index;n:byte); var k:header_index; begin k:=l; while cur_char=" " do get_next; while (cur_char<>"(")and(cur_char<>")") do begin if k ' characters will be kept'); decr(k); end; header_bytes[l]:=k-l; while k= begin next_d:=get_fix; if next_d else design_size:=next_d; end @ @= begin next_d:=get_fix; if next_d<=0 then err_print('The number of units per design size must be positive') @.The number of units...@> else if frozen_du then err_print('Sorry, it''s too late to change the design units') @.Sorry, it's too late...@> else design_units:=next_d; end @ @= begin while cur_char=" " do get_next; if cur_char="T" then seven_bit_safe_flag:=true else if cur_char="F" then seven_bit_safe_flag:=false else err_print('The flag value should be "TRUE" or "FALSE"'); @.The flag value should be...@> skip_to_paren; end @ @= begin c:=get_byte; if c<18 then skip_error('HEADER indices should be 18 or more') @.HEADER indices...@> else if 4*c+4>max_header_bytes then skip_error('This HEADER index is too big for my present table size') @.This HEADER index is too big...@> else begin while header_ptr<4*c+4 do begin header_bytes[header_ptr]:=0; incr(header_ptr); end; read_four_bytes(4*c); end; end @ The remaining kinds of font property values that need to be read are those that involve property lists on higher levels. Each of these has a loop similar to the one that was used at level zero. Then we put the right parenthesis back so that `|finish_the_property|' will be happy; there is probably a more elegant way to do this. @d finish_inner_property_list==begin decr(loc); incr(level); cur_char:=")"; end @= begin while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if (cur_code=char_wd_code) then flush_error('This property name doesn''t belong in a FONTDIMEN list') @.This property name doesn't belong...@> else begin if cur_code=parameter_code then c:=get_integer else c:=cur_code-parameter_code; if c<1 then flush_error('PARAMETER index must be at least 1') @.PARAMETER index must be...@> else if c>max_param_words then flush_error('This PARAMETER index is too big for my present table size') @.This PARAMETER index is too big...@> else begin while np= begin font_number[font_ptr]:=get_integer; cur_font:=0; while font_number[font_ptr]<>font_number[cur_font] do incr(cur_font); if cur_font=font_ptr then {it's a new font number} if font_ptr else err_print('Sorry, too many different mapfonts'); @.Sorry, too many different mapfonts@> if cur_font=font_ptr then skip_to_end_of_item else while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin incr(font_ptr); fname_start[cur_font]:=vf_size; fname_length[cur_font]:=4; {\.{NULL}} farea_start[cur_font]:=vf_size; farea_length[cur_font]:=0; font_checksum[cur_font]:=zero_bytes; font_at[cur_font]:=@'4000000; {denotes design size of this virtual font} font_dsize[cur_font]:=@'50000000; {the |fix_word| for 10} end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if (cur_codefont_dsize_code) then flush_error('This property name doesn''t belong in a MAPFONT list') @.This property name doesn't belong...@> else begin case cur_code of font_name_code:@; font_area_code:@; font_checksum_code:begin get_four_bytes; font_checksum[cur_font]:=cur_bytes; end; font_at_code: begin frozen_du:=true; if design_units=unity then font_at[cur_font]:=get_fix else font_at[cur_font]:=round((get_fix/design_units)*1048576.0); end; font_dsize_code:font_dsize[cur_font]:=get_fix; end; {there are no other cases} finish_the_property; end; end @ @= begin fname_start[cur_font]:=vf_ptr; copy_to_end_of_item; if vf_ptr>fname_start[cur_font]+255 then begin err_print('FONTNAME clipped to 255 characters'); @.FONTNAME clipped...@> fname_length[cur_font]:=255; end else fname_length[cur_font]:=vf_ptr-fname_start[cur_font]; end @ @= begin farea_start[cur_font]:=vf_ptr; copy_to_end_of_item; if vf_ptr>farea_start[cur_font]+255 then begin err_print('FONTAREA clipped to 255 characters'); @.FONTAREA clipped...@> farea_length[cur_font]:=255; end else farea_length[cur_font]:=vf_ptr-farea_start[cur_font]; end @ @= begin lk_step_ended:=false; while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then read_lig_kern_command else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if (cur_codeckrn_code) then flush_error('This property name doesn''t belong in a LIGTABLE list') @.This property name doesn't belong...@> else begin case cur_code of label_code:@; stop_code:@; skip_code:@; krn_code:@; lig_code,lig_code+1,lig_code+2,lig_code+3,lig_code+5,lig_code+6,lig_code+7, lig_code+11:@; clabel_code:@; cpen_code:@; cglue_code:@; cpenglue_code:@; ckrn_code:@; end; {there are no other cases |>=label_code| and |<=ckrn_code|} finish_the_property; end; end @ When a character is about to be tagged, we call the following procedure so that an error message is given in case of multiple tags. @p procedure check_tag(c:integer); {print error if |c| already tagged} begin case char_tag[c] of no_tag: do_nothing; lig_tag: err_print('This character already appeared in a LIGTABLE LABEL'); @.This character already...@> list_tag: err_print('This character already has a NEXTLARGER spec'); ext_tag: err_print('This character already has a VARCHAR spec'); end; end; @ @= begin while cur_char=" " do get_next; if cur_char="B" then begin bchar_label:=nl; skip_to_paren; {\.{LABEL BOUNDARYCHAR}} end else begin backup; c:=get_byte; check_tag(c); char_tag[c]:=lig_tag; char_remainder[c]:=nl; end; if min_nl<=nl then min_nl:=nl+1; lk_step_ended:=false; end @ @d stop_flag=128 {value indicating `\.{STOP}' in a lig/kern program} @d kern_flag=128 {op code for a kern step} @= @!lk_step_ended:boolean; {was the last \.{LIGTABLE} property \.{LIG} or \.{KRN}?} @!krn_ptr:0..max_kerns; {an index into |kern|} @ @= if not lk_step_ended then err_print('STOP must follow LIG or KRN') @.STOP must follow LIG or KRN@> else begin lig_kern[nl-1].b0:=lig_kern[nl-1].b0 div 256 * 256 + stop_flag; lk_step_ended:=false; end @ @= if not lk_step_ended then err_print('SKIP must follow LIG or KRN') @.SKIP must follow LIG or KRN@> else begin c:=get_byte; if c>=128 then err_print('Maximum SKIP amount is 127') @.Maximum SKIP amount...@> else if nl+c>=max_lig_steps then err_print('Sorry, LIGTABLE too long for me to handle') @.Sorry, LIGTABLE too long...@> else begin lig_kern[nl-1].b0:=c; if min_nl<=nl+c then min_nl:=nl+c+1; end; lk_step_ended:=false; end @ @= begin lig_kern[nl].b0:=0; lig_kern[nl].b2:=cur_code-lig_code; lig_kern[nl].b1:=get_byte; lig_kern[nl].b3:=get_byte; if nl>=max_lig_steps-1 then err_print('Sorry, LIGTABLE too long for me to handle') @.Sorry, LIGTABLE too long...@> else incr(nl); lk_step_ended:=true; end @ @= begin lig_kern[nl].b0:=0; lig_kern[nl].b1:=get_byte; kern[nk]:=get_fix; krn_ptr:=0; while kern[krn_ptr]<>kern[nk] do incr(krn_ptr); if krn_ptr=nk then begin if nk decr(krn_ptr); end; end; if ofm_level=-1 then begin lig_kern[nl].b2:=kern_flag+(krn_ptr div 256); lig_kern[nl].b3:=krn_ptr mod 256; end else begin lig_kern[nl].b2:=kern_flag+(krn_ptr div 65536); lig_kern[nl].b3:=krn_ptr mod 65536; end; if nl>=max_lig_steps-1 then err_print('Sorry, LIGTABLE too long for me to handle') @.Sorry, LIGTABLE too long...@> else incr(nl); lk_step_ended:=true; end @ @= @!category_remainders:array[0..256] of integer; @!ivalue_category,@!max_ivalue_category:integer; @!glue_category,@!max_glue_category:integer; @!penalty_category,@!max_penalty_category:integer; @ @= for ivalue_category:=0 to 256 do begin category_remainders[ivalue_category]:=-1; end; max_ivalue_category:=-1; max_glue_category:=-1; max_penalty_category:=-1; @ @= begin c:=get_byte; category_remainders[c]:=nl; if max_ivalue_category= begin lig_kern[nl].b0:=256; lig_kern[nl].b1:=get_byte; lig_kern[nl].b2:=17; penalty_category:=get_byte; if max_penalty_category=max_lig_steps-1 then err_print('Sorry, LIGTABLE too long for me to handle') @.Sorry, LIGTABLE too long...@> else incr(nl); lk_step_ended:=true; end @ @= begin lig_kern[nl].b0:=256; lig_kern[nl].b1:=get_byte; lig_kern[nl].b2:=18; glue_category:=get_byte; if max_glue_category=max_lig_steps-1 then err_print('Sorry, LIGTABLE too long for me to handle') @.Sorry, LIGTABLE too long...@> else incr(nl); lk_step_ended:=true; end @ @= begin lig_kern[nl].b0:=256; lig_kern[nl].b1:=get_byte; lig_kern[nl].b2:=19; penalty_category:=get_byte; if max_penalty_category=max_lig_steps-1 then err_print('Sorry, LIGTABLE too long for me to handle') @.Sorry, LIGTABLE too long...@> else incr(nl); lk_step_ended:=true; end @ @= begin lig_kern[nl].b0:=256; lig_kern[nl].b1:=get_byte; lig_kern[nl].b2:=20; kern[nk]:=get_fix; krn_ptr:=0; while kern[krn_ptr]<>kern[nk] do incr(krn_ptr); if krn_ptr=nk then begin if nk decr(krn_ptr); end; end; if krn_ptr>65535 then err_print('Sorry, too many different kerns for me to handle'); lig_kern[nl].b3:=krn_ptr; if nl>=max_lig_steps-1 then err_print('Sorry, LIGTABLE too long for me to handle') @.Sorry, LIGTABLE too long...@> else incr(nl); lk_step_ended:=true; end @ @= @!char_extended_tag:array [char_type] of boolean; @ @= for c:=0 to max_char do char_extended_tag[c]:=false; @ @= begin if max_penalty_category>0 then begin if nkp=0 then err_print('No PENALTY table') else if npp[0]0 then begin if nkg=0 then err_print('No GLUE table') else if npg[0]0 then begin if nki=0 then err_print('No IVALUE table') else if npi[0]0) then begin for j:=0 to max_ivalue_category do if char_table[c,0]=j then begin if category_remainders[j]<>-1 then begin if char_tag[c]<>0 then err_print('Character already has a tag') else begin char_extended_tag[c]:=true; char_remainder[c]:=category_remainders[j]; end; end; end; end; end; end; end; end @ @= tables_read:boolean; @ @= tables_read:=false; @ Finally we come to the part of \.{VPtoVF}'s input mechanism that is used most, the processing of individual character data. @= begin if not tables_read then begin @; tables_read:=true; end; c:=get_byte; {read the character code that is being specified} @; while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then read_character_property else if cur_char=")" then skip_to_end_of_item else junk_error; end; if char_wd[c]=0 then char_wd[c]:=sort_in(width,0); {legitimatize |c|} finish_inner_property_list; end @ @= @!char_original:array [0..max_char] of integer; @!char_repeats:array [0..max_char] of integer; @!diff:boolean; @!needed_space,@!extra_bytes:integer; @ @= for ch_entry:=0 to max_char do begin char_original[ch_entry]:=ch_entry; char_repeats[ch_entry]:=0; end; @ @= begin if not tables_read then begin compute_new_header_ofm; tables_read:=true; end; c:=get_byte; {read the character code that is being specified} @; crange:=get_byte; {read how many characters are being defined} if (crange<0) then begin err_print('Character ranges must be positive'); crange:=0; end; if ((c+crange)>max_char) then begin err_print('Character range too large'); crange:=0; end; print('-'); print_hex(c+crange); incr(chars_on_line); while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then read_character_property else if cur_char=")" then skip_to_end_of_item else junk_error; end; if char_wd[c]=0 then char_wd[c]:=sort_in(width,0); {legitimatize |c|} finish_inner_property_list; cprime:=c; for c:=(cprime+1) to (cprime+crange) do begin char_wd[c]:=char_wd[cprime]; char_ht[c]:=char_ht[cprime]; char_dp[c]:=char_dp[cprime]; char_ic[c]:=char_ic[cprime]; char_tag[c]:=char_tag[cprime]; char_remainder[c]:=char_remainder[cprime]; packet_start[c]:=packet_start[cprime]; packet_length[c]:=packet_length[cprime]; for tab:=0 to (nki+nkf+nkm+nkr+nkg+nkp-1) do begin char_table[c,tab]:= char_table[cprime,tab]; end; end; end @ Tables for character parameters @d char_param_tables==8 @= @!char_table:array [0..max_char,0..char_param_tables] of integer; @!ch_table,@!ch_entry:integer; @!temp_value:integer; @ @= for c:=0 to max_char do for ch_table:=0 to char_param_tables do char_table[c,ch_table]:=0; @ @d get_char_table_entry(#)== begin ch_table:=get_integer; if (ch_table<0)or(ch_table>=#) then flush_error('Character property index out of range') @.Character property index...@> else begin get_char_table_entry_end @d get_char_table_entry_end(#)== ch_table:=ch_table+#; if ch_table>char_param_tables then flush_error('Character property exceeds table size') @.Character property exceeds...@> else begin if ch_table>npc then npc:=ch_table; char_table[c,ch_table]:=get_integer; end; end; end @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if (cur_codevar_char_code) then flush_error('This property name doesn''t belong in a CHARACTER list') @.This property name doesn't belong...@> else begin case cur_code of char_wd_code:char_wd[c]:=sort_in(width,get_fix); char_ht_code:char_ht[c]:=sort_in(height,get_fix); char_dp_code:char_dp[c]:=sort_in(depth,get_fix); char_ic_code:char_ic[c]:=sort_in(italic,get_fix); sec_width_code, sec_height_code, sec_depth_code, sec_italic_code, accent_code, prim_top_axis_code, prim_top_axis_bis_code, prim_bot_axis_code, prim_bot_axis_bis_code, prim_mid_hor_code, prim_mid_vert_code, prim_base_slant_code, sec_top_axis_code, sec_top_axis_bis_code, sec_bot_axis_code, sec_bot_axis_bis_code, sec_mid_hor_code, sec_mid_vert_code, sec_base_slant_code:temp_value:=get_fix; next_larger_code:begin check_tag(c); char_tag[c]:=list_tag; char_remainder[c]:=get_byte; end; map_code:read_packet(c); var_char_code:@; char_ivalue_code: get_char_table_entry(nki)(0); char_fvalue_code: get_char_table_entry(nkf)(nki); char_mvalue_code: get_char_table_entry(nkm)(nki+nkf); char_rule_code: get_char_table_entry(nkr)(nki+nkf+nkm); char_glue_code: get_char_table_entry(nkg)(nki+nkf+nkm+nkr); char_penalty_code: get_char_table_entry(nkp)(nki+nkf+nkm+nkr+nkg); end;@/ finish_the_property; end; end @ @= begin if ne=xmax_char then err_print('Sorry, too many VARCHAR specs') @.Sorry, too many VARCHAR specs@> else begin check_tag(c); char_tag[c]:=ext_tag; char_remainder[c]:=ne;@/ exten[ne]:=zero_bytes; while level=2 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; incr(ne); finish_inner_property_list; end; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if (cur_codevar_char_code+4) then flush_error('This property name doesn''t belong in a VARCHAR list') @.This property name doesn't belong...@> else begin case cur_code-(var_char_code+1) of 0:exten[ne].b0:=get_byte; 1:exten[ne].b1:=get_byte; 2:exten[ne].b2:=get_byte; 3:exten[ne].b3:=get_byte; end;@/ finish_the_property; end; end @ The input routine is now complete except for the following code, which prints a progress report as the file is being read. @ @= @!HEX: packed array [1..16] of char; @ @= HEX:='0123456789ABCDEF';@/ @ The array |dig| will hold a sequence of digits to be output. @= @!dig:array[0..32] of integer; @ Here, in fact, is a procedure that prints |dig[j-1]|$\,\ldots\,$|dig[0]|, given $j>0$. @p procedure print_digs(j:integer); {prints |j| digits} begin repeat decr(j); print(HEX[1+dig[j]]); until j=0; end; @ The |print_number| procedure indicates how |print_digs| can be used. This procedure can print in octal, decimal or hex notation. @d print_hex(#)==print_number(#,16) @d print_octal(#)==print_number(#,8) @d print_decimal(#)==print_number(#,10) @p procedure print_number(c:integer; form:integer); {prints value of |c|} var j:0..32; {index into |dig|} begin j:=0; if (c<0) then begin print_ln('Internal error: print_number (negative value)'); c:=0; end; if form=8 then print('''') {an apostrophe indicates the octal notation} else if form=16 then print('"') { a double apostrophe indicates the hexadecimal notation} else if form<>10 then begin print_ln('Internal error: print_number (form)'); form:=16; end; while (c>0) or (j=0) do begin dig[j]:=c mod form; c:=c div form; j:=j+1; end; print_digs(j); end; @ @= begin if chars_on_line>=8 then begin print_ln(' '); chars_on_line:=1; end else begin if chars_on_line>0 then print(' '); incr(chars_on_line); end; print_hex(c); {progress report} end @* Assembling the mappings. Each \.{MAP} property is a sequence of \.{DVI} instructions, for which we need to know some of the opcodes. We add afterwards the definitions for outputting typesetting commands. @d set_char_0=0 {\.{DVI} command to typeset character 0 and move right} @d set1=128 {typeset a character and move right} @d set_rule=132 {typeset a rule and move right} @d push=141 {save the current positions} @d pop=142 {restore previous positions} @d right1=143 {move right} @d w0=147 {move right by |w|} @d w1=148 {move right and set |w|} @d x0=152 {move right by |x|} @d x1=153 {move right and set |x|} @d down1=157 {move down} @d y0=161 {move down by |y|} @d y1=162 {move down and set |y|} @d z0=166 {move down by |z|} @d z1=167 {move down and set |z|} @d fnt_num_0=171 {set current font to 0} @d fnt1=235 {set current font} @d xxx1=239 {extension to \.{DVI} primitives} @d xxx4=242 {potentially long extension to \.{DVI} primitives} @d fnt_def1=243 {define the meaning of a font number} @d pre=247 {preamble} @d post=248 {postamble beginning} @d Incr_Decr(#) == # @d Incr(#) == #:=#+Incr_Decr {increase a variable} @d out_four(#) == if x>=0 then #(x div @"1000000) else begin Incr(x)(@"40000000); Incr(x)(@"40000000); #((x div @"1000000) + 128); end; x:=x mod @"1000000; #(x div @"10000); x:=x mod @"10000; #(x div @"100); #(x mod @"100) @d out_cmd(#) == if (x<@"100)and(x>=0) then begin if (o<>set1)or(x>127) then if (o=fnt1)and(x<64) then Incr(x)(fnt_num_0) @+ else #(o); end else begin if (x<@"10000)and(x>=0) then #(o+1) @+ else begin if (x<@"1000000)and(x>=0) then #(o+2) @+ else begin #(o+3); if x>=0 then #(x div @"1000000) else begin Incr(x)(@"40000000); Incr(x)(@"40000000); #((x div @"1000000) + 128); x:=x mod @"1000000; end; #(x div @"10000); x:=x mod @"10000; end; #(x div @"10000); x:=x mod @"10000; end; #(x div @"100); x:=x mod @"100; end; #(x) @p procedure vf_store_set(@!x:integer); var @!o:byte; begin o:=set1; out_cmd(vf_store); end; procedure vfout_set(@!x:integer); var @!o:byte; begin o:=set1; out_cmd(vout); end; procedure vf_store_fnt(@!x:integer); var @!o:byte; begin o:=fnt1; out_cmd(vf_store); end; procedure vfout_fntdef(@!x:integer); var @!o:byte; begin o:=fnt_def1; out_cmd(vout); end; procedure vfout_char(@!x:integer); begin out_four(vout); end; @ We keep stacks of movement values, in order to optimize the \.{DVI} code in simple cases. @= @!hstack:array[0..max_stack] of 0..2; {number of known horizontal movements} @!vstack:array[0..max_stack] of 0..2; {number of known vertical movements} @!wstack,@!xstack,@!ystack,@!zstack:array[0..max_stack] of fix_word; @!stack_ptr:0..max_stack; @ The packet is built by straightforward assembly of \.{DVI} instructions. @p @@;@/ procedure read_packet(@!c:byte); var @!cc:char_type; {character being typeset} @!x:fix_word; {movement} @!h,@!v:0..2; {top of |hstack| and |vstack|} @!special_start:0..vf_size; {location of |xxx1| command} @!k:0..vf_size; {loop index} begin packet_start[c]:=vf_ptr; stack_ptr:=0; h:=0; v:=0; cur_font:=0; while level=2 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; while stack_ptr>0 do begin err_print('Missing POP supplied'); @.Missing POP supplied@> vf_store(pop); decr(stack_ptr); end; packet_length[c]:=vf_ptr-packet_start[c]; finish_inner_property_list; end; @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if (cur_codespecial_hex_code) then flush_error('This property name doesn''t belong in a MAP list') @.This property name doesn't belong...@> else begin case cur_code of select_font_code:@; set_char_code:@; set_rule_code:@; move_right_code,move_right_code+1:@; move_down_code,move_down_code+1:@; push_code:@; pop_code:@; special_code,special_hex_code:@; end;@/ finish_the_property; end; end @ @= begin font_number[font_ptr]:=get_integer; cur_font:=0; while font_number[font_ptr]<>font_number[cur_font] do incr(cur_font); if cur_font=font_ptr then err_print('Undefined MAPFONT cannot be selected') @.Undefined MAPFONT...@> else vf_store_fnt(cur_font); end @ @= if cur_font=font_ptr then err_print('Character cannot be typeset in undefined font') @.Character cannot be typeset...@> else begin cc:=get_byte; vf_store_set(cc); end @ Here's a procedure that converts a |fix_word| to a sequence of \.{DVI} bytes. @= procedure vf_fix(@!opcode:byte;@!x:fix_word); var negative:boolean; @!k:0..4; {number of bytes to typeset} @!t:integer; {threshold} begin frozen_du:=true; if design_units<>unity then x:=round((x/design_units)*1048576.0); if x>=0 then negative:=false else begin negative:=true; x:=-1-x;@+end; if opcode=0 then begin k:=4; t:=@'100000000;@+end else begin t:=127; k:=1; while x>t do begin t:=256*t+255; incr(k); end; vf_store(opcode+k-1); t:=t div 128 +1; end; repeat if negative then begin vf_store(255-(x div t)); negative:=false; x:=(x div t)*t+t-1-x; end else vf_store((x div t) mod 256); decr(k); t:=t div 256; until k=0; end; @ @= begin vf_store(set_rule); vf_fix(0,get_fix); vf_fix(0,get_fix); end @ @= begin if cur_code=move_right_code then x:=get_fix@+else x:=-get_fix; if h=0 then begin wstack[stack_ptr]:=x; h:=1; vf_fix(w1,x);@+end else if x=wstack[stack_ptr] then vf_store(w0) else if h=1 then begin xstack[stack_ptr]:=x; h:=2; vf_fix(x1,x);@+end else if x=xstack[stack_ptr] then vf_store(x0) else vf_fix(right1,x); end @ @= begin if cur_code=move_down_code then x:=get_fix@+else x:=-get_fix; if v=0 then begin ystack[stack_ptr]:=x; v:=1; vf_fix(y1,x);@+end else if x=ystack[stack_ptr] then vf_store(y0) else if v=1 then begin zstack[stack_ptr]:=x; v:=2; vf_fix(z1,x);@+end else if x=zstack[stack_ptr] then vf_store(z0) else vf_fix(down1,x); end @ @= if stack_ptr=max_stack then {too pushy} err_print('Don''t push so much---stack is full!') @.Don't push so much...@> else begin vf_store(push); hstack[stack_ptr]:=h; vstack[stack_ptr]:=v; incr(stack_ptr); h:=0; v:=0; end @ @= if stack_ptr=0 then err_print('Empty stack cannot be popped') @.Empty stack...@> else begin vf_store(pop); decr(stack_ptr); h:=hstack[stack_ptr]; v:=vstack[stack_ptr]; end @ @= begin vf_store(xxx1); vf_store(0); {dummy length} special_start:=vf_ptr; if cur_code=special_code then copy_to_end_of_item else begin repeat x:=get_hex; if cur_char>")" then vf_store(x*16+get_hex); until cur_char<=")"; end; if vf_ptr-special_start>255 then @ else vf[special_start-1]:=vf_ptr-special_start; end @ @= if vf_ptr+3>vf_size then begin err_print('Special command being clipped---no room left!'); @.Special command being clipped...@> vf_ptr:=special_start+255; vf[special_start-1]:=255; end else begin for k:=vf_ptr downto special_start do vf[k+3]:=vf[k]; x:=vf_ptr-special_start; vf_ptr:=vf_ptr+3; vf[special_start-2]:=xxx4; vf[special_start-1]:=x div @'100000000; vf[special_start]:=(x div @'200000) mod 256; vf[special_start+1]:=(x div @'400) mod 256; vf[special_start+2]:=x mod 256; end @* The checking and massaging phase. Once the whole \.{VPL} file has been read in, we must check it for consistency and correct any errors. This process consists mainly of running through the characters that exist and seeing if they refer to characters that don't exist. We also compute the true value of |seven_unsafe|; we make sure that the charlists and ligature programs contain no loops; and we shorten the lists of widths, heights, depths, and italic corrections, if necessary, to keep from exceeding the required maximum sizes. @= @!seven_unsafe:boolean; {do seven-bit characters generate eight-bit ones?} @ @= if nl>0 then @; seven_unsafe:=false; for c:=0 to max_char do if char_wd[c]<>0 then @; if bchar_label; end; if seven_bit_safe_flag and seven_unsafe then print_ln('The font is not really seven-bit-safe!'); @.The font is not...safe@> @; @; finish_extended_font; for c:=0 to max_char do @; @ @ The checking that we need in several places is accomplished by three macros that are only slightly tricky. @d existence_tail(#)==begin char_wd[g]:=sort_in(width,0); print(#,' '); print_hex(c); print_ln(' had no CHARACTER spec.'); end; end @d check_existence_and_safety(#)==begin g:=#; if (g>=128)and(c<128) then seven_unsafe:=true; if char_wd[g]=0 then existence_tail @d check_existence(#)==begin g:=#; if char_wd[g]=0 then existence_tail @= case char_tag[c] of no_tag: do_nothing; lig_tag: @; list_tag: check_existence_and_safety(char_remainder[c]) ('The character NEXTLARGER than'); @.The character NEXTLARGER...@> ext_tag:@; end @ @= begin if exten[char_remainder[c]].b0>0 then check_existence_and_safety(exten[char_remainder[c]].b0) ('TOP piece of character'); @.TOP piece of character...@> if exten[char_remainder[c]].b1>0 then check_existence_and_safety(exten[char_remainder[c]].b1) ('MID piece of character'); @.MID piece of character...@> if exten[char_remainder[c]].b2>0 then check_existence_and_safety(exten[char_remainder[c]].b2) ('BOT piece of character'); @.BOT piece of character...@> check_existence_and_safety(exten[char_remainder[c]].b3) ('REP piece of character'); @.REP piece of character...@> end @ @= if char_tag[c]=list_tag then begin g:=char_remainder[c]; while (g print_hex(c); print_ln('.'); end; end @ @= @!delta:fix_word; {size of the intervals needed for rounding} @ @d round_message(#)==if delta>0 then print_ln('I had to round some ', @.I had to round...@> #,'s by ',(((delta+1) div 2)/@'4000000):1:7,' units.') @= case ofm_level of -1: begin top_width:=255; top_depth:=15; top_height:=15; top_italic:=63; end; 0: begin top_width:=65535; top_depth:=255; top_height:=255; top_italic:=255; end; 1: begin top_width:=65535; top_depth:=255; top_height:=255; top_italic:=255; end; end; delta:=shorten(width,top_width); set_indices(width,delta); round_message('width');@/ delta:=shorten(height,top_height); set_indices(height,delta); round_message('height');@/ delta:=shorten(depth,top_depth); set_indices(depth,delta); round_message('depth');@/ delta:=shorten(italic,top_italic); set_indices(italic,delta); round_message('italic correction'); @ @d clear_lig_kern_entry== {make an unconditional \.{STOP}} lig_kern[nl].b0:=255; lig_kern[nl].b1:=0; lig_kern[nl].b2:=0; lig_kern[nl].b3:=0 @= begin if bchar_labelnl do begin clear_lig_kern_entry; incr(nl); end; if (lig_kern[nl-1].b0 mod 256)=0 then lig_kern[nl-1].b0:=lig_kern[nl-1].b0 div 256 * 256 + stop_flag; end @ It's not trivial to check for infinite loops generated by repeated insertion of ligature characters. But fortunately there is a nice algorithm for such testing, copied here from the program \.{TFtoPL} where it is explained further. @d simple=0 {$f(x,y)=z$} @d left_z=1 {$f(x,y)=f(z,y)$} @d right_z=2 {$f(x,y)=f(x,z)$} @d both_z=3 {$f(x,y)=f(f(x,z),y)$} @d pending=4 {$f(x,y)$ is being evaluated} @ @= @!lig_ptr:0..max_lig_steps; {an index into |lig_kern|} @!hash:array[0..hash_size] of integer64; @!class:array[0..hash_size] of simple..pending; @!lig_z:array[0..hash_size] of xxchar_type; @!hash_ptr:0..hash_size; {the number of nonzero entries in |hash|} @!hash_list:array[0..hash_size] of 0..hash_size; {list of those nonzero entries} @!h,@!hh:0..hash_size; {indices into the hash table} @!tt:indx; {temporary register} @!x_lig_cycle,@!y_lig_cycle:xchar_type; {problematic ligature pair} @ @= hash_ptr:=0; y_lig_cycle:=xmax_char; for k:=0 to hash_size do hash[k]:=0; @ @d lig_exam==lig_kern[lig_ptr].b1 @d lig_gen==lig_kern[lig_ptr].b3 @= begin lig_ptr:=char_remainder[c]; if lig_kern[lig_ptr].b0<256 then begin repeat if hash_input(lig_ptr,c) then begin if lig_kern[lig_ptr].b2bchar then check_existence(lig_exam)('LIG character examined by'); @.LIG character examined...@> check_existence(lig_gen)('LIG character generated by'); @.LIG character generated...@> if lig_gen>=128 then if(c<128)or(c=bchar) then if(lig_exam<128)or(lig_exam=bchar) then seven_unsafe:=true; end else if lig_exam<>bchar then check_existence(lig_exam)('KRN character examined by'); @.KRN character examined...@> end; if lig_kern[lig_ptr].b0>=stop_flag then lig_ptr:=nl else lig_ptr:=lig_ptr+1+lig_kern[lig_ptr].b0; until lig_ptr>=nl; end; end @ The |hash_input| procedure is copied from \.{TFtoPL}, but it is made into a boolean function that returns |false| if the ligature command was masked by a previous one. @p function hash_input(@!p,@!c:indx):boolean; {enter data for character |c| and command in location |p|, unless it isn't new} label 30; {go here for a quick exit} var @!cc:simple..both_z; {class of data being entered} @!zz:char_type; {function value or ligature character being entered} @!y:char_type; {the character after the cursor} @!key:integer64; {value to be stored in |hash|} @!t64:integer64; {temporary register for swapping} @!t:integer; {temporary register for swapping} begin if hash_ptr=hash_size then begin hash_input:=false; goto 30;@+end; @; key:=int64cast(xmax_char)*c+y+1; h:=(hash_mult*key) mod hash_size; while hash[h]>0 do begin if hash[h]<=key then begin if hash[h]=key then begin hash_input:=false; goto 30; {unused ligature command} end; t64:=hash[h]; hash[h]:=key; key:=t64; {do ordered-hash-table insertion} t:=class[h]; class[h]:=cc; cc:=t; {namely, do a swap} t:=lig_z[h]; lig_z[h]:=zz; zz:=t; end; if h>0 then decr(h)@+else h:=hash_size; end; hash[h]:=key; class[h]:=cc; lig_z[h]:=zz; incr(hash_ptr); hash_list[hash_ptr]:=h; hash_input:=true; 30:end; @ @= y:=lig_kern[p].b1; t:=lig_kern[p].b2; cc:=simple; zz:=lig_kern[p].b3; if t>=kern_flag then zz:=y else begin case t of 0,6:do_nothing; {\.{LIG},\.{/LIG>}} 5,11:zz:=y; {\.{LIG/>}, \.{/LIG/>>}} 1,7:cc:=left_z; {\.{LIG/}, \.{/LIG/>}} 2:cc:=right_z; {\.{/LIG}} 3:cc:=both_z; {\.{/LIG/}} end; {there are no other cases} end @ (More good stuff from \.{TFtoPL}.) @p function f(@!h,@!x,@!y:indx):indx; forward;@t\2@> {compute $f$ for arguments known to be in |hash[h]|} function eval(@!x,@!y:indx):indx; {compute $f(x,y)$ with hashtable lookup} var @!key:integer64; {value sought in hash table} begin key:=int64cast(xmax_char)*x+y+1; h:=(hash_mult*key) mod hash_size; while hash[h]>key do if h>0 then decr(h)@+else h:=hash_size; if hash[h]= if hash_ptrsimple then {make sure $f$ is well defined} tt:=f(tt,(hash[tt]-1)div xmax_char,(hash[tt]-1)mod xmax_char); end; if(hash_ptr=hash_size)or(y_lig_cycle if x_lig_cycle=xmax_char then print('boundary')@+else print_hex(x_lig_cycle); print(' and '); print_hex(y_lig_cycle); print_ln('!'); end else print_ln('Sorry, I haven''t room for so many ligature/kern pairs!'); @.Sorry, I haven't room...@> print_ln('All ligatures will be cleared.'); for c:=0 to max_char do if char_tag[c]=lig_tag then begin char_tag[c]:=no_tag; char_remainder[c]:=0; end; nl:=0; bchar:=xmax_char; bchar_label:=xmax_label; end @ The lig/kern program may still contain references to nonexistent characters, if parts of that program are never used. Similarly, there may be extensible characters that are never used, because they were overridden by \.{NEXTLARGER}, say. This would produce an invalid \.{TFM} file; so we must fix such errors. @d double_check_tail(#)==@t\1@>if char_wd[0]=0 then char_wd[0]:=sort_in(width,0); print('Unused ',#,' refers to nonexistent character '); print_hex(c); print_ln('!'); end; end @d double_check_lig(#)==begin c:=lig_kern[lig_ptr].#; if char_wd[c]=0 then if c<>bchar then begin lig_kern[lig_ptr].#:=0; double_check_tail @d double_check_ext(#)==begin c:=exten[g].#; if c>0 then if char_wd[c]=0 then begin exten[g].#:=0; double_check_tail @d double_check_rep(#)==begin c:=exten[g].#; if char_wd[c]=0 then begin exten[g].#:=0; double_check_tail @= if nl>0 then for lig_ptr:=0 to nl-1 do if (lig_kern[lig_ptr].b0 div 256)=0 then begin if lig_kern[lig_ptr].b2 @.Unused KRN step...@> if ne>0 then for g:=0 to ne-1 do begin double_check_ext(b0)('VARCHAR TOP'); double_check_ext(b1)('VARCHAR MID'); double_check_ext(b2)('VARCHAR BOT'); double_check_rep(b3)('VARCHAR REP'); @.Unused VARCHAR...@> end @* The TFM output phase. Now that we know how to get all of the font data correctly stored in \.{VPtoVF}'s memory, it only remains to write the answers out. First of all, it is convenient to have an abbreviation for output to the \.{TFM} file: @d out(#)==write(tfm_file,#) @p procedure out_int(@!x:integer); begin out_four(out); end; @ The general plan for producing \.{TFM} files is long but simple: @= compute_subfile_sizes; output_subfile_sizes; @; output_new_information_ofm; output_character_info; @; @; @; @ @ A \.{TFM} file begins with 12 numbers that tell how big its subfiles are. We already know most of these numbers; for example, the number of distinct widths is |memory[width]+1|, where the $+1$ accounts for the zero width that is always supposed to be present. But we still should compute the beginning and ending character codes (|bc| and |ec|), the number of header words (|lh|), and the total number of words in the \.{TFM} file (|lf|). @= @!bc:char_type; {the smallest character code in the font} @!ec:char_type; {the largest character code in the font} @!lh:char_type; {the number of words in the header block} @!lf:unsigned_integer; {the number of words in the entire \.{TFM} file} @!not_found:boolean; {has a font character been found?} @!temp_width:fix_word; {width being used to compute a check sum} @!ncw,@!nco,@!npc:integer; @ @= npc:=-1; @ It might turn out that no characters exist at all. But \.{VPtoVF} keeps going and writes the \.{TFM} anyway. In this case |ec| will be~0 and |bc| will be~1. @= lh:=header_ptr div 4;@/ not_found:=true; bc:=0; if (ofm_level=-1) then ec:=255 @+ else ec:=max_char; while not_found do if (char_wd[bc]>0)or(bc=ec) then not_found:=false else incr(bc); not_found:=true; while not_found do if (char_wd[ec]>0)or(ec=0) then not_found:=false else decr(ec); if bc>ec then bc:=1; incr(memory[width]); incr(memory[height]); incr(memory[depth]); incr(memory[italic]);@/ @; case ofm_level of -1: begin lf:=6+lh+(ec-bc+1)+memory[width]+memory[height]+memory[depth]+ memory[italic]+nl+lk_offset+nk+ne+np; end; 0: begin lf:=14+lh+2*(ec-bc+1)+memory[width]+memory[height]+memory[depth]+ memory[italic]+2*(nl+lk_offset)+nk+2*ne+np; end; 1: begin @; lf:=29+lh+ncw+memory[width]+memory[height]+memory[depth]+ memory[italic]+2*(nl+lk_offset)+nk+2*ne+np+ nki+nwi+nkf+nwf+nkm+nwm+nkr+nwr+nkg+nwg+nkp+nwp; nco:=29+lh+nki+nwi+nkf+nwf+nkm+nwm+nkr+nwr+nkg+nwg+nkp+nwp; end; end; @ @d out_size(#)==out((#) div 256); out((#) mod 256) @d out_integer(#)==out((#) div @"1000000); out(((#) mod @"1000000) div @"10000); out(((#) mod @"10000) div @"100); out((#) mod @"100) @= case ofm_level of -1: begin out_size(lf); out_size(lh); out_size(bc); out_size(ec); out_size(memory[width]); out_size(memory[height]); out_size(memory[depth]); out_size(memory[italic]); out_size(nl+lk_offset); out_size(nk); out_size(ne); out_size(np); end; 0: begin out_integer(0); out_integer(lf); out_integer(lh); out_integer(bc); out_integer(ec); out_integer(memory[width]); out_integer(memory[height]); out_integer(memory[depth]); out_integer(memory[italic]); out_integer(nl+lk_offset); out_integer(nk); out_integer(ne); out_integer(np); out_integer(font_dir); end; 1: begin out_integer(1); out_integer(lf); out_integer(lh); out_integer(bc); out_integer(ec); out_integer(memory[width]); out_integer(memory[height]); out_integer(memory[depth]); out_integer(memory[italic]); out_integer(nl+lk_offset); out_integer(nk); out_integer(ne); out_integer(np); out_integer(font_dir); out_integer(nco); out_integer(ncw); out_integer(npc); out_integer(nki); out_integer(nwi); out_integer(nkf); out_integer(nwf); out_integer(nkm); out_integer(nwm); out_integer(nkr); out_integer(nwr); out_integer(nkg); out_integer(nwg); out_integer(nkp); out_integer(nwp); end; end; @ The routines that follow need a few temporary variables of different types. @= @!j:0..max_header_bytes; {index into |header_bytes|} @!p:pointer; {index into |memory|} @!q:width..italic; {runs through the list heads for dimensions} @!par_ptr:0..max_param_words; {runs through the parameters} @ The header block follows the subfile sizes. The necessary information all appears in |header_bytes|, except that the design size and the seven-bit-safe flag must still be set. @= if not check_sum_specified then @; header_bytes[design_size_loc]:=design_size div @'100000000; {this works since |design_size>0|} header_bytes[design_size_loc+1]:=(design_size div @'200000) mod 256; header_bytes[design_size_loc+2]:=(design_size div 256) mod 256; header_bytes[design_size_loc+3]:=design_size mod 256; if (not seven_unsafe)and(ofm_level=-1) then header_bytes[seven_flag_loc]:=128; for j:=0 to header_ptr-1 do out(header_bytes[j]); @ @= begin c0:=bc; c1:=ec; c2:=bc; c3:=ec; for c:=bc to ec do if char_wd[c]>0 then begin temp_width:=memory[char_wd[c]]; if design_units<>unity then temp_width:=round((temp_width/design_units)*1048576.0); temp_width:=temp_width + (c+4)*@'20000000; {this should be positive} c0:=(c0+c0+temp_width) mod 255; c1:=(c1+c1+temp_width) mod 253; c2:=(c2+c2+temp_width) mod 251; c3:=(c3+c3+temp_width) mod 247; end; header_bytes[check_sum_loc]:=c0; header_bytes[check_sum_loc+1]:=c1; header_bytes[check_sum_loc+2]:=c2; header_bytes[check_sum_loc+3]:=c3; end @ @= @!tab:integer; @ @= if ofm_level=1 then begin ncw:=0; incr(npc); needed_space:=(12+npc*2) div 4; extra_bytes:=(needed_space*4) - (10+npc*2); for c:=bc to ec do begin if char_original[c]=c then begin cprime:=c+1; diff:=false; while (not diff) and (cprime<=ec) do begin if index[char_wd[c]]<>index[char_wd[cprime]] then diff:=true; if index[char_ht[c]]<>index[char_ht[cprime]] then diff:=true; if index[char_dp[c]]<>index[char_dp[cprime]] then diff:=true; if index[char_ic[c]]<>index[char_ic[cprime]] then diff:=true; if char_tag[c]<>char_tag[cprime] then diff:=true; if char_remainder[c]<>char_remainder[cprime] then diff:=true; for tab:=0 to npc-1 do begin if char_table[c,tab]<>char_table[cprime,tab] then diff:=true; end; if not diff then begin char_original[cprime]:=c; cprime:=cprime+1; end; end; if cprime>(c+1) then begin char_repeats[c]:=cprime-c-1; end; ncw:=ncw+needed_space; end; end; end; @ The next block contains packed |char_info|. @d out_two(#)==out((#) div 256); out((#) mod 256) @d out_three(#)==out((#) div 65536); out_two((#) mod 65536) @= index[0]:=0; for c:=bc to ec do case ofm_level of -1: begin out(index[char_wd[c]]); out(index[char_ht[c]]*16+index[char_dp[c]]); out(index[char_ic[c]]*4+char_tag[c]); out(char_remainder[c]); end; 0: begin out(index[char_wd[c]] div 256); out(index[char_wd[c]] mod 256); out(index[char_ht[c]]); out(index[char_dp[c]]); out(index[char_ic[c]]); out(char_tag[c]); out(char_remainder[c] div 256); out(char_remainder[c] mod 256); end; 1: begin if c=char_original[c] then begin out(index[char_wd[c]] div 256); out(index[char_wd[c]] mod 256); out(index[char_ht[c]]); out(index[char_dp[c]]); out(index[char_ic[c]]); tab:=char_tag[c]; if char_extended_tag[c] then begin tab:=5; end; out(tab); out(char_remainder[c] div 256); out(char_remainder[c] mod 256); out_size(char_repeats[c]); for tab:=0 to npc-1 do begin out(char_table[c,tab] div 256); out(char_table[c,tab] mod 256); end; for tab:=1 to extra_bytes do begin out(0); end; end; end; end; @ When a scaled quantity is output, we may need to divide it by |design_units|. The following subroutine takes care of this, using floating point arithmetic only if |design_units<>1.0|. @p procedure out_scaled(x:fix_word); {outputs a scaled |fix_word|} var @!n:byte; {the first byte after the sign} @!m:0..65535; {the two least significant bytes} begin if abs(x/design_units)>=16.0 then begin print_ln('The relative dimension ',x/@'4000000:1:3, ' is too large.'); @.The relative dimension...@> print(' (Must be less than 16*designsize'); if design_units<>unity then print(' =',design_units/@'200000:1:3, ' designunits'); print_ln(')'); x:=0; end; if design_units<>unity then x:=round((x/design_units)*1048576.0); if x<0 then begin out(255); x:=x+@'100000000; if x<=0 then x:=1; end else begin out(0); if x>=@'100000000 then x:=@'77777777; end; n:=x div @'200000; m:=x mod @'200000; out(n); out(m div 256); out(m mod 256); end; @ We have output the packed indices for individual characters. The scaled widths, heights, depths, and italic corrections are next. @= for q:=width to italic do begin out(0); out(0); out(0); out(0); {output the zero word} p:=link[q]; {head of list} while p>0 do begin out_scaled(memory[p]); p:=link[p]; end; end; @ One embarrassing problem remains: The ligature/kern program might be very long, but the starting addresses in |char_remainder| can be at most~65535. Therefore we need to output some indirect address information; we want to compute |lk_offset| so that addition of |lk_offset| to all remainders makes all but |lk_offset| distinct remainders less than~65536. For this we need a sorted table of all relevant remainders. @= @!label_table:array[xchar_type] of record @!rr: -1..xmax_label; {sorted label values} @!cc: char_type; {associated characters} end; @!label_ptr:xchar_type; {index of highest entry in |label_table|} @!sort_ptr:xchar_type; {index into |label_table|} @!lk_offset:xchar_type; {smallest offset value that might work} @!t:0..xmax_label; {label value that is being redirected} @!extra_loc_needed:boolean; {do we need a special word for |bchar|?} @ @= @; if bchar; if bchar_label= label_ptr:=0; label_table[0].rr:=-1; {sentinel} for c:=bc to ec do if char_tag[c]=lig_tag then begin sort_ptr:=label_ptr; {there's a hole at position |sort_ptr+1|} while label_table[sort_ptr].rr>char_remainder[c] do begin label_table[sort_ptr+1]:=label_table[sort_ptr]; decr(sort_ptr); {move the hole} end; label_table[sort_ptr+1].cc:=c; label_table[sort_ptr+1].rr:=char_remainder[c]; incr(label_ptr); end @ @= begin sort_ptr:=label_ptr; {the largest unallocated label} if ofm_level=-1 then begin if label_table[sort_ptr].rr+lk_offset > 255 then begin lk_offset:=0; extra_loc_needed:=false; {location 0 can do double duty} repeat char_remainder[label_table[sort_ptr].cc]:=lk_offset; while label_table[sort_ptr-1].rr=label_table[sort_ptr].rr do begin decr(sort_ptr); char_remainder[label_table[sort_ptr].cc]:=lk_offset; end; incr(lk_offset); decr(sort_ptr); until lk_offset+label_table[sort_ptr].rr<256; {N.B.: |lk_offset=256| satisfies this when |sort_ptr=0|} end; end else begin if label_table[sort_ptr].rr+lk_offset > 65535 then begin lk_offset:=0; extra_loc_needed:=false; {location 0 can do double duty} repeat char_remainder[label_table[sort_ptr].cc]:=lk_offset; while label_table[sort_ptr-1].rr=label_table[sort_ptr].rr do begin decr(sort_ptr); char_remainder[label_table[sort_ptr].cc]:=lk_offset; end; incr(lk_offset); decr(sort_ptr); until lk_offset+label_table[sort_ptr].rr<65536; {N.B.: |lk_offset=65536| satisfies this when |sort_ptr=0|} end; end; if lk_offset>0 then while sort_ptr>0 do begin char_remainder[label_table[sort_ptr].cc]:= char_remainder[label_table[sort_ptr].cc]+lk_offset; decr(sort_ptr); end; end @ @= if ofm_level=-1 then begin if extra_loc_needed then begin {|lk_offset=1|} out(255); out(bchar); out(0); out(0); end else for sort_ptr:=1 to lk_offset do begin {output the redirection specs} t:=label_table[label_ptr].rr; if bchar<256 then begin out(255); out(bchar); end else begin out(254); out(0); end; out_size(t+lk_offset); repeat decr(label_ptr); until label_table[label_ptr].rr0 then for lig_ptr:=0 to nl-1 do begin out(lig_kern[lig_ptr].b0); out(lig_kern[lig_ptr].b1); out(lig_kern[lig_ptr].b2); out(lig_kern[lig_ptr].b3); end; if nk>0 then for krn_ptr:=0 to nk-1 do out_scaled(kern[krn_ptr]) end else begin if extra_loc_needed then begin {|lk_offset=1|} out_size(255); out_size(bchar); out_size(0); out_size(0); end else for sort_ptr:=1 to lk_offset do begin {output the redirection specs} t:=label_table[label_ptr].rr; if bchar0 then for lig_ptr:=0 to nl-1 do begin out_size(lig_kern[lig_ptr].b0); out_size(lig_kern[lig_ptr].b1); out_size(lig_kern[lig_ptr].b2); out_size(lig_kern[lig_ptr].b3); end; if nk>0 then for krn_ptr:=0 to nk-1 do out_scaled(kern[krn_ptr]) end @ @= if ofm_level=-1 then begin if ne>0 then for c:=0 to ne-1 do begin out(exten[c].b0); out(exten[c].b1); out(exten[c].b2); out(exten[c].b3); end; end else begin if ne>0 then for c:=0 to ne-1 do begin out_size(exten[c].b0); out_size(exten[c].b1); out_size(exten[c].b2); out_size(exten[c].b3); end; end; @ For our grand finale, we wind everything up by outputting the parameters. @= for par_ptr:=1 to np do begin if par_ptr=1 then @ else out_scaled(param[par_ptr]); end @ @= begin if param[1]<0 then begin param[1]:=param[1]+@'10000000000; out((param[1] div @'100000000)+256-64); end else out(param[1] div @'100000000); out((param[1] div @'200000) mod 256); out((param[1] div 256) mod 256); out(param[1] mod 256); end @* The VF output phase. Output to |vf_file| is considerably simpler. @d id_byte=202 {current version of \.{VF} format} @d vout(#)==write(vf_file,#) @= @!vcount:integer; {number of bytes written to |vf_file|} @ We need a routine to output integers as four bytes. Negative values will never be less than $-2^{24}$. @p procedure vout_int(@!x:integer); begin if x>=0 then vout(x div @'100000000) else begin vout(255); x:=x+@'100000000; end; vout((x div @'200000) mod 256); vout((x div @'400) mod 256); vout(x mod 256); end; @ @= vout(pre); vout(id_byte); vout(vtitle_length); for k:=0 to vtitle_length-1 do vout(vf[vtitle_start+k]); for k:=check_sum_loc to design_size_loc+3 do vout(header_bytes[k]); vcount:=vtitle_length+11; for cur_font:=0 to font_ptr-1 do @; for c:=bc to ec do if char_wd[c]>0 then @; repeat vout(post); incr(vcount); until vcount mod 4 = 0 @ @= begin vfout_fntdef(cur_font);@/ vout(font_checksum[cur_font].b0); vout(font_checksum[cur_font].b1); vout(font_checksum[cur_font].b2); vout(font_checksum[cur_font].b3); vout_int(font_at[cur_font]); vout_int(font_dsize[cur_font]); vout(farea_length[cur_font]); vout(fname_length[cur_font]); for k:=0 to farea_length[cur_font]-1 do vout(vf[farea_start[cur_font]+k]); if fname_start[cur_font]=vf_size then begin vout("N"); vout("U"); vout("L"); vout("L"); end else for k:=0 to fname_length[cur_font]-1 do vout(vf[fname_start[cur_font]+k]); vcount:=vcount+12+farea_length[cur_font]+fname_length[cur_font]; end @ @= begin x:=memory[char_wd[c]]; if design_units<>unity then x:=round((x/design_units)*1048576.0); if (packet_length[c]>241)or(x<0)or(x>=@'100000000)or(c<0)or(c>255) then begin vout(242); vout_int(packet_length[c]); vfout_char(c); vout_int(x); vcount:=vcount+13+packet_length[c]; end else begin vout(packet_length[c]); vout(c); vout(x div @'200000); vout((x div @'400) mod 256); vout(x mod 256); vcount:=vcount+5+packet_length[c]; end; if packet_start[c]=vf_size then vfout_set(c) else for k:=0 to packet_length[c]-1 do vout(vf[packet_start[c]+k]); end @* The main program. The routines sketched out so far need to be packaged into separate procedures, on some systems, since some \PASCAL\ compilers place a strict limit on the size of a routine. The packaging is done here in an attempt to avoid some system-dependent changes. @p procedure param_enter; begin @; end; @# procedure vpl_enter; begin @; end; @# procedure name_enter; {enter all names and their equivalents} begin @; vpl_enter; param_enter; end; @# procedure read_lig_kern; var @!krn_ptr:0..max_kerns; {an index into |kern|} @!c:byte; {runs through all character codes} begin @; end; @# procedure output_new_information_ofm; begin @; end; @# procedure compute_new_header_ofm; begin @; end; @# procedure finish_extended_font; begin @; end; @# procedure output_subfile_sizes; begin @; end; @# procedure compute_subfile_sizes; begin @; end; @# procedure output_character_info; begin @; end; @# @# procedure read_font_rule_list; begin @; end; @# procedure read_font_glue_list; begin @; end; @# procedure read_font_penalty_list; begin @; end; @# procedure read_font_mvalue_list; begin @; end; @# procedure read_font_fvalue_list; begin @; end; @# procedure read_font_ivalue_list; begin @; end; @# procedure read_repeated_character_info; begin @; end; @# procedure read_lig_kern_command; begin @; end; @# procedure read_character_property; begin @; end; @# procedure read_char_info; begin @; end; @# procedure read_input; var @!c:byte; {header or parameter index} begin @; end; @# procedure corr_and_check; var @!c:xchar_type; {runs through all character codes} @!hh:0..hash_size; {an index into |hash_list|} @!lig_ptr:0..max_lig_steps; {an index into |lig_kern|} @!g:byte; {a character generated by the current character |c|} begin @ end; @# procedure vf_output; var @!c:char_type; {runs through all character codes} @!cur_font:xfont_type; {runs through all local fonts} @!k:integer; {loop index} begin @; end; @ Here is where \.{VPtoVF} begins and ends. @p begin initialize;@/ name_enter;@/ read_input; print_ln('.');@/ corr_and_check;@/ @; vf_output; end. @ @= @!ofm_level:integer; @ @= ofm_level:=-1; {Suppose that it is a TFM file} @ @= begin ofm_level:=get_integer; if (ofm_level<0) or (ofm_level>1) then begin flush_error('OFMLEVEL must be 0 or 1 -- 1 assumed'); ofm_level:=1; end; end @ @= begin font_dir:=-1; repeat get_next; until cur_char<>" "; case cur_char of "T": begin get_next; if cur_char="L" then font_dir:=0 else if cur_char="R" then font_dir:=2; end; "B": begin get_next; if cur_char="L" then font_dir:=4 else if cur_char="R" then font_dir:=6; end; "R": begin get_next; if cur_char="T" then font_dir:=5 else if cur_char="B" then font_dir:=7; end; "L": begin get_next; if cur_char="T" then font_dir:=1 else if cur_char="B" then font_dir:=3; end; end; while cur_char<>")" do get_next; if font_dir = -1 then begin flush_error('FONTDIR must be valid direction, -- TL assumed'); font_dir:=0; end; end @ @= begin font_dir:=-1; repeat get_next; until cur_char<>" "; case cur_char of "T": begin get_next; if cur_char="L" then font_dir:=8 else if cur_char="R" then font_dir:=10; end; "B": begin get_next; if cur_char="L" then font_dir:=12 else if cur_char="R" then font_dir:=14; end; "R": begin get_next; if cur_char="T" then font_dir:=13 else if cur_char="B" then font_dir:=15; end; "L": begin get_next; if cur_char="T" then font_dir:=9 else if cur_char="B" then font_dir:=11; end; end; while cur_char<>")" do get_next; if font_dir = -1 then begin flush_error('NFONTDIR must be valid direction, -- TL assumed'); font_dir:=8; end; end @ Here are some general values for the various entries. They can all be changed. @d arrays_per_kind==20 @d entries_per_array==200 @ @= @!rule_arrays=arrays_per_kind; @!rule_entries=entries_per_array; @ @= rule_array_type=0..rule_arrays; rule_entry_type=0..rule_entries; rule_node= record rn_width: fix_word; rn_height: fix_word; rn_depth: fix_word; end; @ @= @!rules:array[rule_array_type,rule_entry_type] of rule_node; @!npr:array[rule_array_type] of integer; @!nkr:integer; @!nwr:integer; @!r_array:integer; @!r_number:integer; @ @= for r_array := 0 to rule_arrays do begin npr[r_array]:=0; @; end; nkr:=-1; @ @= begin if tables_read then flush_error('All parameter tables must appear before character info'); r_array:=get_integer; if r_array>rule_arrays then flush_error('This FONTRULE table index is too big for my present size') else if r_array<0 then flush_error('This FONTRULE index is negative') else begin if r_array>nkr then nkr:=r_array; while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>rule_code then flush_error('This property name doesn''t belong in a FONTRULE list') else begin r_number:=get_integer; if r_number>rule_entries then flush_error('This RULE index is too big for my present table size') else if r_number<0 then flush_error('This RULE index is negative') else begin while npr[r_array]; end; @; finish_the_property; end; end; end @ @= begin rules[r_array,npr[r_array]].rn_width:=0; rules[r_array,npr[r_array]].rn_depth:=0; rules[r_array,npr[r_array]].rn_height:=0; end @ @= begin while level=2 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if (cur_coderule_depth_code) then flush_error('This property name doesn''t belong in a RULE list') else begin case cur_code of rule_width_code: rules[r_array,r_number].rn_width:=get_fix; rule_height_code: rules[r_array,r_number].rn_height:=get_fix; rule_depth_code: rules[r_array,r_number].rn_depth:=get_fix; end; finish_the_property; end; end @ @
= begin nwr:=0; for r_array := 0 to nkr do begin incr(npr[r_array]); nwr := nwr + 3*npr[r_array]; end; incr(nkr); end @ @= begin for r_array:= 0 to nkr-1 do for r_number:=0 to npr[r_array]-1 do begin out_scaled(rules[r_array,r_number].rn_width); out_scaled(rules[r_array,r_number].rn_height); out_scaled(rules[r_array,r_number].rn_depth); end; end @ @= begin for r_array:= 0 to nkr-1 do begin out_integer(npr[r_array]); end; end @ @= @!glue_arrays=arrays_per_kind; @!glue_entries=entries_per_array; @ @d t_normal==0 @d t_aleaders==1 @d t_cleaders==2 @d t_xleaders==3 @d o_unit==0 @d o_fi==1 @d o_fil==2 @d o_fill==3 @d o_filll==4 @d g_space==0 @d g_rule==1 @d g_char==2 @= glue_array_type=0..glue_arrays; glue_entry_type=0..glue_entries; glue_node= record gn_width: fix_word; gn_stretch: fix_word; gn_shrink: fix_word; gn_type: integer; gn_arg_type: g_space..g_char; gn_stretch_order: integer; gn_shrink_order: integer; gn_argument: integer; end; @ @= @!glues:array[glue_array_type,glue_entry_type] of glue_node; @!npg:array[glue_array_type] of integer; @!nkg:integer; @!nwg:integer; @!g_array:integer; @!g_byte:integer; @!g_number:integer; @ @= for g_array := 0 to glue_arrays do begin npg[g_array]:=0; @; end; nkg:=-1; @ @= begin if tables_read then flush_error('All parameter tables must appear before character info'); g_array:=get_integer; if g_array>glue_arrays then flush_error('This FONTGLUE table index is too big for my present size') else if g_array<0 then flush_error('This FONTGLUE index is negative') else begin if g_array>nkg then nkg:=g_array; while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>glue_code then flush_error('This property name doesn''t belong in a FONTGLUE list') else begin g_number:=get_integer; if g_number>glue_entries then flush_error('This GLUE index is too big for my present table size') else if g_number<0 then flush_error('This GLUE index is negative') else begin while npg[g_array]; end; @; finish_the_property; end; end; end @ @= begin glues[g_array,npg[g_array]].gn_width:=0; glues[g_array,npg[g_array]].gn_stretch:=0; glues[g_array,npg[g_array]].gn_shrink:=0; glues[g_array,npg[g_array]].gn_type:=0; glues[g_array,npg[g_array]].gn_arg_type:=0; glues[g_array,npg[g_array]].gn_stretch_order:=0; glues[g_array,npg[g_array]].gn_shrink_order:=0; glues[g_array,npg[g_array]].gn_argument:=0; end @ @= begin while level=2 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if (cur_codeglue_rule_code) then flush_error('This property name doesn''t belong in a GLUE list') else begin case cur_code of glue_width_code: glues[g_array,g_number].gn_width:=get_fix; glue_stretch_code: glues[g_array,g_number].gn_stretch:=get_fix; glue_shrink_code: glues[g_array,g_number].gn_shrink:=get_fix; glue_type_code: begin g_byte:=get_integer; if (g_byte<0) or (g_byte>3) then begin g_byte:=0; end; glues[g_array,g_number].gn_type:=g_byte; end; glue_stretch_order_code: begin g_byte:=get_integer; if (g_byte<0) or (g_byte>4) then begin g_byte:=0; end; glues[g_array,g_number].gn_stretch_order:=g_byte; end; glue_shrink_order_code: begin g_byte:=get_integer; if (g_byte<0) or (g_byte>4) then begin g_byte:=0; end; glues[g_array,g_number].gn_shrink_order:=g_byte; end; glue_char_code: begin glues[g_array,g_number].gn_argument:=get_integer; glues[g_array,g_number].gn_arg_type:=g_char; end; glue_rule_code: begin glues[g_array,g_number].gn_argument:=get_integer; glues[g_array,g_number].gn_arg_type:=g_rule; end; end; finish_the_property; end; end @ @
= begin nwg:=0; for g_array := 0 to nkg do begin incr(npg[g_array]); nwg := nwg + 4*npg[g_array]; end; incr(nkg); end @ @= begin for g_array:= 0 to nkg-1 do for g_number:=0 to npg[g_array]-1 do begin g_byte:=glues[g_array,g_number].gn_type*16+ glues[g_array,g_number].gn_arg_type; out(g_byte); g_byte:=glues[g_array,g_number].gn_stretch_order*16+ glues[g_array,g_number].gn_shrink_order; out(g_byte); g_byte:=glues[g_array,g_number].gn_argument div 256; out(g_byte); g_byte:=glues[g_array,g_number].gn_argument mod 256; out(g_byte); out_scaled(glues[g_array,g_number].gn_width); out_scaled(glues[g_array,g_number].gn_stretch); out_scaled(glues[g_array,g_number].gn_shrink); end; end @ @= begin for g_array:= 0 to nkg-1 do begin out_integer(npg[g_array]); end; end @ @= @!penalty_arrays=arrays_per_kind; @!penalty_entries=entries_per_array; @ @= penalty_array_type=0..penalty_arrays; penalty_entry_type=0..penalty_entries; penalty_node= record pn_val: integer; end; @ @= @!penalties:array[penalty_array_type,penalty_entry_type] of penalty_node; @!npp:array[penalty_array_type] of integer; @!nkp:integer; @!nwp:integer; @!p_array:integer; @!p_number:integer; @ @= for p_array := 0 to penalty_arrays do begin npp[p_array]:=0; @; end; nkp:=-1; @ @= begin if tables_read then flush_error('All parameter tables must appear before character info'); p_array:=get_integer; if p_array>penalty_arrays then flush_error('This FONTPENALTY table index is too big for my present size') else if p_array<0 then flush_error('This FONTPENALTY index is negative') else begin if p_array>nkp then nkp:=p_array; while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>penalty_code then flush_error('This property name doesn''t belong in a FONTPENALTY list') else begin p_number:=get_integer; if p_number>penalty_entries then flush_error('This PENALTY index is too big for my present table size') else if p_number<0 then flush_error('This PENALTY index is negative') else begin while npp[p_array]; end; @; finish_the_property; end; end; end @ @= begin penalties[p_array,npp[p_array]].pn_val:=0; end @ @= begin while level=2 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>penalty_val_code then flush_error('This property name doesn''t belong in a PENALTY list') else begin penalties[p_array,p_number].pn_val:=get_integer; finish_the_property; end; end @ @
= begin nwp:=0; for p_array := 0 to nkp do begin incr(npp[p_array]); nwp := nwp + npp[p_array]; end; incr(nkp); end @ @= begin for p_array:= 0 to nkp-1 do for p_number:=0 to npp[p_array]-1 do begin out_int(penalties[p_array,p_number].pn_val); end; end @ @= begin for p_array:= 0 to nkp-1 do begin out_integer(npp[p_array]); end; end @ @= @!mvalue_arrays=arrays_per_kind; @!mvalue_entries=entries_per_array; @ @= mvalue_array_type=0..mvalue_arrays; mvalue_entry_type=0..mvalue_entries; mvalue_node= record fn_val: fix_word; end; @ @= @!mvalues:array[mvalue_array_type,mvalue_entry_type] of mvalue_node; @!npm:array[mvalue_array_type] of integer; @!nkm:integer; @!nwm:integer; @!m_array:integer; @!m_number:integer; @ @= for m_array := 0 to mvalue_arrays do begin npm[m_array]:=0; @; end; nkm:=-1; @ @= begin if tables_read then flush_error('All parameter tables must appear before character info'); m_array:=get_integer; if m_array>mvalue_arrays then flush_error('This FONTMVALUE table index is too big for my present size') else if m_array<0 then flush_error('This FONTMVALUE index is negative') else begin if m_array>nkm then nkm:=m_array; while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>mvalue_code then flush_error('This property name doesn''t belong in an FONTMVALUE list') else begin m_number:=get_integer; if m_number>mvalue_entries then flush_error('This MVALUE index is too big for my present table size') else if m_number<0 then flush_error('This MVALUE index is negative') else begin while npm[m_array]; end; @; finish_the_property; end; end; end @ @= begin mvalues[m_array,npm[m_array]].fn_val:=0; end @ @= begin while level=2 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>mvalue_val_code then flush_error('This property name doesn''t belong in a MVALUE list') else begin mvalues[m_array,m_number].fn_val:=get_fix; finish_the_property; end; end @ @
= begin nwm:=0; for m_array := 0 to nkm do begin incr(npm[m_array]); nwm := nwm + npm[m_array]; end; incr(nkm); end @ @= begin for m_array:= 0 to nkm-1 do for m_number:=0 to npm[m_array]-1 do begin out_scaled(mvalues[m_array,m_number].fn_val); end; end @ @= begin for m_array:= 0 to nkm-1 do begin out_integer(npm[m_array]); end; end @ @= @!fvalue_arrays=arrays_per_kind; @!fvalue_entries=entries_per_array; @ @= fvalue_array_type=0..fvalue_arrays; fvalue_entry_type=0..fvalue_entries; fvalue_node= record fn_val: fix_word; end; @ @= @!fvalues:array[fvalue_array_type,fvalue_entry_type] of fvalue_node; @!npf:array[fvalue_array_type] of integer; @!nkf:integer; @!nwf:integer; @!f_array:integer; @!f_number:integer; @ @= for f_array := 0 to fvalue_arrays do begin npf[f_array]:=0; @; end; nkf:=-1; @ @= begin if tables_read then flush_error('All parameter tables must appear before character info'); f_array:=get_integer; if f_array>fvalue_arrays then flush_error('This FONTFVALUE table index is too big for my present size') else if f_array<0 then flush_error('This FONTFVALUE index is negative') else begin if f_array>nkf then nkf:=f_array; while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>fvalue_code then flush_error('This property name doesn''t belong in an FONTFVALUE list') else begin f_number:=get_integer; if f_number>fvalue_entries then flush_error('This FVALUE index is too big for my present table size') else if f_number<0 then flush_error('This FVALUE index is negative') else begin while npf[f_array]; end; @; finish_the_property; end; end; end @ @= begin fvalues[f_array,npf[f_array]].fn_val:=0; end @ @= begin while level=2 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>fvalue_val_code then flush_error('This property name doesn''t belong in a FVALUE list') else begin fvalues[f_array,f_number].fn_val:=get_fix; finish_the_property; end; end @ @
= begin nwf:=0; for f_array := 0 to nkf do begin incr(npf[f_array]); nwf := nwf + npf[f_array]; end; incr(nkf); end @ @= begin for f_array:= 0 to nkf-1 do for f_number:=0 to npf[f_array]-1 do begin out_scaled(fvalues[f_array,f_number].fn_val); end; end @ @= begin for f_array:= 0 to nkf-1 do begin out_integer(npf[f_array]); end; end @ @= @!ivalue_arrays=arrays_per_kind; @!ivalue_entries=entries_per_array; @ @= ivalue_array_type=0..ivalue_arrays; ivalue_entry_type=0..ivalue_entries; ivalue_node= record in_val: integer; end; @ @= @!ivalues:array[ivalue_array_type,ivalue_entry_type] of ivalue_node; @!npi:array[ivalue_array_type] of integer; @!font_i_array:boolean; @!nki:integer; @!nwi:integer; @!i_array:integer; @!i_number:integer; @ @= for i_array := 0 to ivalue_arrays do begin npi[i_array]:=0; @; end; nki:=-1; @ @= begin if tables_read then flush_error('All parameter tables must appear before character info'); i_array:=get_integer; if i_array>ivalue_arrays then flush_error('This FONTIVALUE table index is too big for my present size') else if i_array<0 then flush_error('This FONTIVALUE index is negative') else begin if i_array>nki then nki:=i_array; while level=1 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>ivalue_code then flush_error('This property name doesn''t belong in an FONTIVALUE list') else begin i_number:=get_integer; if i_number>ivalue_entries then flush_error('This IVALUE index is too big for my present table size') else if i_number<0 then flush_error('This IVALUE index is negative') else begin while npi[i_array]; end; @; finish_the_property; end; end; end @ @= begin ivalues[i_array,npi[i_array]].in_val:=0; end @ @= begin while level=2 do begin while cur_char=" " do get_next; if cur_char="(" then @ else if cur_char=")" then skip_to_end_of_item else junk_error; end; finish_inner_property_list; end @ @= begin get_name; if cur_code=comment_code then skip_to_end_of_item else if cur_code<>ivalue_val_code then flush_error('This property name doesn''t belong in a IVALUE list') else begin ivalues[i_array,i_number].in_val:=get_integer; finish_the_property; end; end @ @
= begin nwi:=0; for i_array := 0 to nki do begin incr(npi[i_array]); nwi := nwi + npi[i_array]; end; incr(nki); end @ @= begin for i_array:= 0 to nki-1 do for i_number:=0 to npi[i_array]-1 do begin out_int(ivalues[i_array,i_number].in_val); end; end @ @= begin for i_array:= 0 to nki-1 do begin out_integer(npi[i_array]); end; end @ @= begin @
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; end @ @= begin @; @; @; @; @; @; @; @; @; @; @; @; end @* System-dependent changes. This section should be replaced, if necessary, by changes to the program that are necessary to make \.{VPtoVF} work at a particular installation. It is usually best to design your change file so that all changes to previous sections preserve the section numbering; then everybody's version will be consistent with the printed program. More extensive changes, which introduce new sections, can be inserted here; then only the index itself will get a new section number. @^system dependencies@> @* Index. Pointers to error messages appear here together with the section numbers where each ident\-i\-fier is used.