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%% This is part of OpTeX project, see http://petr.olsak.net/optex
\_codedecl \eoldef {OpTeX useful macos <2020-05-03>} % preloaded in format
\_doc -----------------------------
We define \`\opinput` `{<file name>}` macro which
does `\input {<file name>}` but catocodes are set to normal catcodes
(like \OpTeX/ initializes them) and the catodes setting is return back to
the current values when the file is read. You can use `\optinput`
in any situation inside the document and you will be sure that the file
is read correctly with correct catcode settings.
In order to achieve this, we declare \`\optexcatcodes` catcode table
and \`\plaintexcatocdes`. They save the commonly used catcode tables.
Note that `\catcodetable` is a part of \LuaTeX/ extension.
The catcodetable stack is implemented by \OpTeX/ macros.
The \`\setctable` `<catcode table>` pushes
current catcode table to the stack and activates catcodes from
the `<catcode table>`. The \`\restorectable` returns to the saved catocdes
from the catcode table stack. So, the `\opinput` macro can be implemented simply:
\_cod -----------------------------
\_def\_opinput #1{\_setctable\_optexcatcodes \_input {#1}\_relax\_restorectable}
\_newcatcodetable \_optexcatcodes
\_newcatcodetable \_plaintexcatcodes
\_public \optexcatcodes \plaintexcatcodes \opinput ;
\_savecatcodetable\_optexcatcodes
{\_catcode`_=8 \savecatcodetable\plaintexcatcodes}
\_doc -----------------------------
The implementation of the catcodetable stack follows.
The current catodes are
managed in the `\catcodetable0`. If the `\setctable` is used first (or at
the outer level of the stack), then the `\catcodetable0` is pushed to the
stack and the current table is re-set to the given `<catcode table>`.
The numbers of these tables are stacked to the \`\_ctablelist` macro.
The `\restorectable` reads the last saved catcode table number from the
`\_ctablelist` and uses it.
\_cod -----------------------------
\_newcount\_currctable \_currctable=0
\_catcodetable0
\_def\_setctable#1{\_edef\_ctablelist{{\_the\_currctable}\_ctablelist}%
\_catcodetable#1\_relax \_currctable=#1\_relax
}
\_def\_restorectable{\_ea\_restorectableA\_ctablelist\_relax}
\_def\_restorectableA#1#2\_relax{%
\_ifx^#2^\_opwarning
{You can't use \_noindent\restorectable without previous \_string\setctable}%
\_else \_def\_ctablelist{#2}\_catcodetable#1\_relax \_currctable=#1\_relax \_fi
}
\_def\_ctablelist{.}
\_public \setctable \restorectable ;
\_doc -----------------------------
When a special macro is defined with different catcodes then
\`\normalcatcodes` can be used at the end of such definition.
The normal catcodes are restored.
The macro reads
catcodes from `\optecatodes` table and sets it to the main catcode table 0.
\_cod -----------------------------
\_def\_normalcatcodes {\_catcodetable\_optexcatcodes \_savecatcodetable0 \_catcodetable0 }
\_public \normalcatodes ;
\_doc -----------------------------
The \`\load` `[<filename-list>]` loads files specfied in
comma separated `<filename-list>`. The first space (after comma)
is ignored using the trick `#1#2,`: first parameter is unseparated.
The `\load` macro saves the information about loaded files by setting
`\_load:<filename>` as a defined macro.
If the \`\_afterload` macro is defined then it is run after `\_opinput`.
The catcode setting should be here. Note that catcode setting done in the
loaded file is forgotten after the `\opinput`.
\_cod -----------------------------
\_def \_load [#1]{\_loadA #1,,,\_end}
\_def \_loadA #1#2,{\_ifx,#1 \_ea \_loadE \_else \_loadB{#1#2}\_ea\_loadA\_fi}
\_def \_loadB #1{%
\_ifcsname _load:#1\_endcsname \_else
\_isfile {#1.opm}\_iftrue \_opinput {#1.opm}\_else \_opinput {#1}\_fi
\_sxdef{_load:#1}{}%
\_trycs{_afterload}{}\_let\_afterload=\_undefined
\_fi
}
\_def \_loadE #1\_end{}
\_public \load ;
\_doc -----------------------------
The declarator \`\optdef``\macro [<opt default>] <params>{<replacement text>}`
defines the `\macro` with the optional parameter followed by normal parameters
declared in `<params>`. The optional parameter must be used as the first
first parameter in brackets `[...]`. If it isn't used then <opt default>
is taken into account. The `<replacement text>` can use `\the\opt`
because optional parameter is saved to the \`\opt` tokens register.
Note the difference from \LaTeX/ concept where the optional parameter is
in `#1`. \OpTeX/ uses `#1` as the first normal parameter (if declared).
The \`\_nospaceafter` ignores the following optional space at expand
processor level using the negative `\romannumeral` trick.
\_cod -----------------------------
\_def\_optdef#1[#2]{%
\_def#1{\_opt={#2}\_isnextchar[{\_cs{_oA:\_string#1}}{\_cs{_oB:\_string#1}}}%
\_sdef{_oA:\_string#1}[##1]{\_opt={##1}\_cs{_oB:\_string#1\_nospaceafter}}%
\_sdef{_oB:\_string#1\_nospaceafter}%
}
\_def\_nospaceafter#1{\_ea#1\_romannumeral-`\.}
\_newtoks\_opt
\_public \opt \optdef ;
\_doc -----------------------------
The declarator \`\eoldef``\macro #1{<replacement text>}` defines a `\macro`
which scans its parameter to the end of the current line.
This is the parameter `#1` which can be used in the `<replacement text>`.
The catcode of the `\endlinechar` is reset temporarily when the parameter is scanned.
The macro defined by `\eoldef` cannot be used with its parameter inside
other macros because the catcode dancing is not possible here. But the
\`\bracedparam``\macro{<parameter>}` can be used here. The `\bracedparam`
is a prefix which re-sets temporarily the `\macro` to a `\macro` with
normal one parameter.
The \`\skiptoeol` macro reads the text to the end of the current line
and ignores it.
\_cod -----------------------------
\_def\_eoldef #1{\_def #1{\_begingroup \_catcode`\^^M=12 \_eoldefA #1}%
\_ea\_def\_csname _\_csstring #1:M\_endcsname}
\_catcode`\^^M=12 %
\_def\_eoldefA #1#2^^M{\_endgroup\_csname _\_csstring #1:M\_endcsname{#2}}%
\_normalcatcodes %
\_eoldef\_skiptoeol#1{}
\_def\_bracedparam#1{\_ifcsname _\_csstring #1:M\_endcsname
\_csname _\_csstring #1:M\_ea \_endcsname
\_else \_csname __in\_csstring #1:M\_ea \_endcsname \_fi
}
\_public \eoldef \skiptoeol \bracedparam ;
\_doc -----------------------------
The \`\replstring``\macro{<textA>}{<textB>}`
replaces all occurrences of `<textA>` by `<textB>` in the `\macro` body.
The `\macro` must be defined without parameters. The occurrences of
`<textA>` are not replaced if they are \"hidden" in braces, for example
`...{...<textA>...}...`. The category codes in the `<textA>` must exactly
match.
\_cod -----------------------------
\_catcode`!=3 \_catcode`?=3
\_def\_replstring #1#2#3{% \replstring #1{stringA}{stringB}
\_long\_def\_replacestringsA##1#2{\_def #1{##1}\_replacestringsB}%
\_long\_def\_replacestringsB##1#2{\_ifx!##1\_relax \_else \_addto #1{#3##1}%
\_ea\_replacestringsB\_fi}%
\_ea\_replacestringsA #1?#2!#2%
\_long\_def\_replacestringsA##1?{\_def #1{##1}}\_ea\_replacestringsA #1}
\_normalcatcodes
\_public \replstring ;
\_doc -----------------------------
The \`\catcode` primitive is redefined here. Why?
There is very common cases like \code{\\catcode`}`<something>`
or `\catcode"<number>` but these characters
\code{\`} or \code{"} can be set as active (typically by `\activettchar` macro).
Nothing problematic happens if re-defined `\catcode` is used in this case.
If you really need primitive `\catcode` then you can use `\_catcode`.
\_cod -----------------------------
\_def\catcode{\_catcode\_string} % more robust in cases \catcode` or \catcode"
\_doc -----------------------------
The \`\removespaces` `<text with spaces >{}` expands to <textwithoutspaces>.
\nl
The `\_ea`\`\ignorept``\the<dimen>` expands to a decimal
number `\the<dimen>` but without `pt` unit.
\nl
The \`\ignoreit``<token>` just ignores the `<token>`.
\_cod -----------------------------
\_def\_removespaces #1 {\_isempty{#1}\_iffalse #1\_ea\_removespaces\_fi}
\_ea\_def \_ea\_ignorept \_ea#\_ea1\_detokenize{pt}{#1}
\_def\_ignoreit#1{}
\public \removespaces \ignorept \ignoreit ;
\_doc -----------------------------
You can use expandable \`\bp``{<dimen>}` convertor from
\TeX/ `<dimen>` (or from an expression accepted by
`\dimexpr` primitive) to a decimal value in big points
(used as natural unit in the PDF format). So, you can write, for example:
\begtt
\pdfliteral{q \_bp{.3\hsize-2mm} \_bp{2mm} m 0 \_bp{-4mm} l S Q}
\endtt
You can use expandable \`\expr``{<expression>}` for analogical purposes.
It expands to the value of the `<expression>` at expand processor level
with \`\_decdigits` digits after decimal point.
The `<expression>` can include `+-*/()` and decimal numbers in common syntax.
The usage of prefixed versions \`\_expr` or \`\_bp` is more recommended
because user can re-define the control sequences `\expr` or `\bp`.
\_cod -----------------------------
\_def\_decdigits{3} % digits after decimal point in \_bp and \_expr outputs.
\_def\_pttopb{%
\_directlua{tex.print(string.format('\_pcent.\_decdigits f',
token.scan_dimen()/65781.76))}% pt to bp conversion
}
\def\_bp#1{\_ea\_pttopb\_dimexpr#1\_relax}
\def\_expr#1{\_directlua{tex.print(string.format('\_pcent.\_decdigits f',#1))}}
\_public \expr \bp ;
\_doc ------------------
The pair {\`\_doc` ... \`\_cod`} is used for documenting macros and to
printing the technical documentation of the \OpTeX/. The syntax is:
{\begtt
\_doc <ignored text>
<documentation>
\_cod <ignored text>
\endtt
}
The `<documentation>` (and `<ignored text>` too) must be `<balanced text>`.
It means that you cannot document only the `{` but you must document the `}` too.
\_cod ------------------
\_long\_def\_doc #1\_cod {\_skiptoeol}
\_endcode % -------------------------------------
2020-05-03 \load macro introduced
2020-03-15 released
|
