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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \begtt {Verbatim <2020-04-22>} % preloaded in format
\_doc ----------------------------
The internal parameters
\`\_ttskip`, \`\_ttpenalty`, \`\_viline`, \`\_vifile` and \`\_ttfont`
for verbatim macros are set.
\_cod ----------------------------
\_def\_ttskip{\_medskip} % space above and below \begtt, \verbinput
\_mathchardef\_ttpenalty=100 % penalty between lines in \begtt, \verbinput
\_newcount\_viline % last line number in \verbinput
\_newread\_vifile % file given by \verinput
\_def\_ttfont{\_tt} % default tt font
\_doc ----------------------------
\`\code``{<text>}` expands to `\detokenize{<text>}` when `\escapechar=-1`. In
order to do it more robust when it is used in `\write` then it expands as
noexpanded `\code<space>` (followed by space in its csname). This macro
does the real work.
The \`\_printinverbatim``{<text>}` macro is used for `\code{<text>}` printing and for
\code{`}<text>\code{`} printing. It is defined as `\hbox`, so the in-verbatim <text>
will be never broken. But you can re-define this macro.
When `\code` occurs in PDF outlines then it does the same as `\detokenize`.
The macro for preparing outlines sets `\escapechar` to $-1$ and uses
\^`\_regoul` token list before `\edef`.
The `\code` is not `\proteced` because we want it expands to
`\unexpanded{\code<space>{<text>}}` in `\write` parameters. This protect the
expansions of the `\code` parameter (like `\\`, `\^` etc.).
\_cod ----------------------------
\_def\_code#1{\_unexpanded\_ea{\_csname _code \_endcsname{#1}}}
\_protected\_sdef{_code }#1{{\_escapechar=-1 \_ttfont \_the\_everyintt \_relax
\_ea\_printinverbatim\_ea{\_detokenize{#1}}}}
\_def\_printinverbatim#1{\_leavevmode\_hbox{#1}}
\_regmacro {}{}{\_let\code=\_detokenize \_let\_code=\_detokenize}
\_public \code ;
\_doc ----------------------------
The \`\_setverb` macro sets all catcodes to \"verbatim mode". It should be used only
in a group, so we prepare a new catcode table with \"verbatim" catcodes and we define
it as\nl `\_catcodetable`\`\_verbatimcatcodes`. After the group is finished then
original catcode table is restored.
\_cod ----------------------------
\_newcatcodetable \_verbatimcatcodes
\_def\_setverb{\_begingroup
\_def\do##1{\_catcode`##1=12 }
\_dospecials
\_savecatcodetable\_verbatimcatcodes % all characters are normal
\_endgroup
}
\_setverb
\_def\_setverb{\_catcodetable\_verbatimcatcodes }%
\_doc ----------------------------
\`\activettchar``<char>` saves original catcode of previously declared `<char>` (if
such character was declared) using \`\_savedttchar` and \`\_savedttcharc`
values. Then new such values are stored. The declared character is activated
by `\_adef` as a macro (active character) which opens a group,
does `\_setverb` and other settings and reads its parameter until second the same
character. This is done by the \`\_readverb` macro. Finally it prints scanned
`<text>` by \^`\_printinverbatim` and closes group. Suppose that `\activettchar"` is
used. Then the following work is schematically done:
\begtt
\_def "{\_begingroup \_setverb ... \_readverb}
\_def \_readverb #1"{\_printinverbatim{#1}\_endgroup}
\endtt
Note that the second occurrence of `"` is not active because `\_setverb`
deactivates it.
\_cod ----------------------------
\_def\_activettchar#1{%
\_ifx\_savedttchar\_undefined\_else \_catcode\_savedttchar=\_savedttcharc \_fi
\_chardef\_savedttchar=`#1
\_chardef\_savedttcharc=\_catcode`#1
\_adef{#1}{\_begingroup \_setverb \_adef{ }{\ }\_ttfont \_the\_everyintt\_relax \_readverb}%
\_def\_readverb ##1#1{\_printinverbatim{##1}\_endgroup}%
}
\_public \activettchar ;
\_doc ----------------------------
\`\begtt` is defined only as public. We don't need private `\_begtt` variant.
This macro is defined by `\eoldef`, so user can put a parameter at the
same line where `\begtt` is. This `#1` parameter is used after `\_everytt`
parameters settings, so user can change them locally.
The `\begtt` macro opens group, does \^`\_setverb` and another preprocessing, sets
`\endlinechar` to `^^J` and reads the following text in verbatim mode
until \`\endtt` occurs. This scanning is done by \`\_startverb` macro which is
defined as:
\begtt \adef/{\bslash}
\_def\_startverb #1/endtt #2^^J{...}
\endtt
We must to ensure that the backslash in `\endtt` has category 12 (this is a
reason of the `\ea` chain in real code).
The `#2` is something between `\endtt` and end of the same line and it is simply
ignored.
The `\_startverb` puts the scanned data to \`\_prepareverbdata`. It sets the data
to `\_tmpb` without changes by default, but you should re-define it in order
to do special changes, if you want. (For example, \^`\hisyntax` redefines
this macro.) The scanned data have `^^J` at each end of line and all spaces are
active characters (defined as {\visiblesp`\ `}).
Other characters have normal category 11 or 12.
When `\_prepareverbdata` finishes then `\_startverb` runs \`\_printverb` loop
over each line of the data and does a final work: last skip plus `\noindent`
in the next paragraph.
The `\_printverb` macro calls \`\_printverbline``{<line>}` to each scanned line of
verbatim text. This macro expect that it strarts in vertical mode and it must
do `\par` in order to return the vertical mode. The \`\_printverblinenum`
is used here: it does nothing when `\_ttline`\code{<0} else it prints the line
number using `\_llap`.
\_cod ----------------------------
\_eoldef \begtt#1{\_par \_wipeepar
\_vskip\_parskip \_ttskip
\_begingroup
\_setverb
\_ifnum\_ttline<0 \_let\_printverblinenum=\_relax \_else \_initverblinenum \_fi
\_adef{ }{\ }\_adef\^^I{\t}\_parindent=\_ttindent \_parskip=0pt
\_def\t{\_hskip \_dimexpr\_tabspaces em/2\_relax}%
\_the\_everytt \_relax #1\_relax \_ttfont
\_endlinechar=`^^J
\_startverb
}
\_ea\_def\_ea\_startverb \_ea#\_ea1\_csstring\\endtt#2^^J{%
\_prepareverbdata\_tmpb{#1^^J}%
\_ea\_printverb \_tmpb\_end
\_par
\_endgroup \_ttskip
\_isnextchar\_par{}{\_noindent}%
}
\_def\_printverb #1^^J#2{\_ifx\_end#2
\_bgroup \_adef{ }{}\_def\t{}%
\_ifcat&\_egroup \_else\_egroup \_printverbline{#1}\_fi
\_else
\_printverbline{#1}%
\_ea \_printverb \_ea #2%
\_fi
}
\_def\_prepareverbdata#1#2{\_def#1{#2}}
\_def\_printverbline#1{\_penalty \_ttpenalty
\_indent \_printverblinenum \_kern\_ttshift #1\par}
\_def\_initverblinenum{\_tenrm \_thefontscale[700]\_ea\_let\_ea\_sevenrm\_the\_font}
\_def\_printverblinenum{\_global\_advance\_ttline by1 \_llap{\_sevenrm \_the\_ttline\_kern.9em}}
\_doc ----------------------------
Macro \`\verbinput` uses a file read previously or opens the given file. Then
it runs the parameter scanning by \`\_viscanparameter` and \`\_viscanminus`.
Finally the \`\_doverbinput` is run. At begining of `\_doverbinput`, we have
`\_viline`= number of lines already read using previous `\verbinput`,
`\_vinolines`= the number of lines we need to skip and `\_vidolnes`= the
number of lines we need to print.
Similar preparation is done as in `\begtt` after the group is opened. Then
we skip \`\_vinolines` lines in a loop a and we read \`\_vidolines` lines. The
read data is accumulated into `\_tmpb` macro. The next steps are equal to
the steps done in \^`\_startverb` macro: data are processed via
\^`\_prepareverbdata` and printed via \^`\_printverb` loop.
\_cod \_fin ----------------------
\_def\_verbinput #1(#2) #3 {\_par \_def\_tmpa{#3}%
\_def\_tmpb{#1}% cmds used in local group
\_ifx\_vifilename\_tmpa \_else
\_openin\_vifile={#3}%
\_global\_viline=0 \_global\_let\_vifilename=\_tmpa
\_ifeof\_vifile
\_opwarning{\_noexpand\verbinput - file "#3" is unable to reading}
\_ea\_ea\_ea\_skiptorelax
\_fi
\_fi
\_viscanparameter #2+\_relax
}
\_def\_skiptorelax#1\_relax{}
\_def \_viscanparameter #1+#2\_relax{%
\_if$#2$\_viscanminus(#1)\_else \_viscanplus(#1+#2)\_fi
}
\_def\_viscanplus(#1+#2+){%
\_if$#1$\_tmpnum=\_viline
\_else \_ifnum#1<0 \_tmpnum=\_viline \_advance\_tmpnum by-#1
\_else \_tmpnum=#1
\_advance\_tmpnum by-1
\_ifnum\_tmpnum<0 \_tmpnum=0 \_fi % (0+13) = (1+13)
\_fi \_fi
\_edef\_vinolines{\_the\_tmpnum}%
\_if$#2$\_def\_vidolines{0}\_else\_edef\_vidolines{#2}\_fi
\_doverbinput
}
\_def\_viscanminus(#1-#2){%
\_if$#1$\_tmpnum=0
\_else \_tmpnum=#1 \_advance\_tmpnum by-1 \_fi
\_ifnum\_tmpnum<0 \_tmpnum=0 \_fi % (0-13) = (1-13)
\_edef\_vinolines{\_the\_tmpnum}%
\_if$#2$\_tmpnum=0
\_else \_tmpnum=#2 \_advance\_tmpnum by-\_vinolines \_fi
\_edef\_vidolines{\_the\_tmpnum}%
\_doverbinput
}
\_def\_doverbinput{%
\_tmpnum=\_vinolines
\_advance\_tmpnum by-\_viline
\_ifnum\_tmpnum<0
\_openin\_vifile={\_vifilename}%
\_global\_viline=0
\_else
\_edef\_vinolines{\_the\_tmpnum}%
\_fi
\_vskip\_parskip \_ttskip \_wipeepar
\_begingroup
\_ifnum\_ttline<-1 \_let\_printverblinenum=\_relax \_else \_initverblinenum \_fi
\_setverb \_adef{ }{\ }\_adef\^^I{\t}\_parindent=\_ttindent \_parskip=0pt
\_def\t{\_hskip \_dimexpr\_tabspaces em/2\_relax}%
\_the\_everytt\_relax \_tmpb\_relax \_ttfont
\_endlinechar=`^^J \_tmpnum=0
\_loop \_ifeof\_vifile \_tmpnum=\_vinolines\_space \_fi
\_ifnum\_tmpnum<\_vinolines\_space
\_vireadline \_advance\_tmpnum by1 \_repeat %% skip lines
\_edef\_ttlinesave{\_ttline=\_the\_ttline}%
\_ifnum\_ttline=-1 \_ttline=\_viline \_fi
\_tmpnum=0 \_def\_tmpb{}%
\_ifnum\_vidolines=0 \_tmpnum=-1 \_fi
\_ifeof\_vifile \_tmpnum=\_vidolines\_space \_fi
\_loop \_ifnum\_tmpnum<\_vidolines\_space
\_vireadline
\_ifnum\_vidolines=0 \_else\_advance\_tmpnum by1 \_fi
\_ifeof\_vifile \_tmpnum=\_vidolines\_space \_else \_visaveline \_fi %% save line
\_repeat
\_ea\_prepareverbdata \_ea \_tmpb\_ea{\_tmpb^^J}%
\_ea\_printverb \_tmpb\_end
\_global\_ttlinesave
\_par
\_endgroup
\_ttskip
\_isnextchar\_par{}{\_noindent}%
}
\_def\_vireadline{\_read\_vifile to \_tmp \_global\_advance\_viline by1 }
\_def\_visaveline{\_ea\_addto\_ea\_tmpb\_ea{\_tmp}}
\_public \verbinput ;
\_doc -----------------------------
The \`\visiblesp` sets spaces as visible characters \char9251.
It redefines {\visiblesp`\ `} primitive, so it is useful for verbatim modes only.
\_cod -----------------------------
\_def \_visiblesp{\_ifx\_initunifonts\_relax \_def\ {\_char9251 }%
\_else \_def\ {\_char32 }\_fi}
\_public \visiblesp ;
\_endcode
\_endinput
History:
2020-04-22 ... \ttshift introduced
2020-04-06 ... \visiblesp added
2020-04-04 ... ^^I activated as \t for multiline verbatim
\verbinput <cmds> (...) <filename>, <cmds> added.
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