[NTG-context] Re: Triaging tikz error: Cannot parse this coordinate

[Hans Hagen <j.hagen@xs4all.nl>]

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On 8/8/2023 7:43 PM, Hans Hagen wrote:
> On 8/8/2023 6:13 PM, Xavier B. wrote:
>> After some time, I could write a minimal example with tikz with 
>> strange error: Cannot parse this coordinate.
>>
>> Can someone help me to find the bug?
>>
>> I attach the file and the log.
>>
>> Help very appreciate
>> I run
>   \starttikzpicture
>     \foreach \p in {(6,2)}
>     {
>     \tracingall
>       \startscope[shift={\p}]
>          \draw[color=green!60, thick] (0,0) -- (1,1);
>       \stopscope
>     }
>    \stoptikzpicture
> 
> looks like some parsing issue, are you sure that you can assign \p to 
> shift this way?
ok, i found it but i'm not going to make it custom to fix tikz

you need to use this:

      \normalexpanded{\noexpand\startscope[shift={\p}]}

instead of

       \startscope[shift={\p}]

this can be automated with (maybe we need a m-fixz module for that)

% fix

\appendtoks
     \let\normaltikzstartscope\startscope
     \def\startscope[#1]%
       {\normalexpanded
          {\noexpand\normaltikzstartscope[#1]}}%
\to \everyinsidetikzpicture

% end of fix

but for that you need to use the attached module so that we hook it in 
aftert tikz sets itself up

the fix you can put in your style or in a cont-loc.mkxl in a local tree

Hans

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                                           Hans Hagen | PRAGMA ADE
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[-- Attachment #2: m-tikz.mkxl --]
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%D \module
%D   [       file=m-tikz,
%D        version=2021.07.12,
%D          title=\CONTEXT\ Extra Modules,
%D       subtitle=TIKZ support,
%D         author=Hans Hagen,
%D           date=\currentdate,
%D      copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.

%D A fixed variant of the t-tikz module distributed with tikz. For practical reasons
%D per 2021 we split the module for \MKIV\ and \LMTX. (Maybe some day I'll optimize
%D TIKZ a bit.)
%D
%D All these t-* modules in the tikz distribution make no sense as we can just load
%D them here which is way cleaner. There is also some mkii filename mapping going on
%D that is not needed on todays systems (windows has no 8.3 limitation and on unix
%D tds finally adopted a case insensitive approach.)

%D Just in case someone does a hard input ...

\ifdefined\pgfdefined    \endinput \fi
\ifdefined\pgfcoredefined\endinput \fi

%D ... but normally we end up here:

\startmodule[tikz]

\ifdefined\pdflastxpos \else
    \unprotect
        \frozen\overloaded\protected\def\pdflastxpos{\numexpr\clf_lastxpos\relax}
        \frozen\overloaded\protected\def\pdflastypos{\numexpr\clf_lastypos\relax}
    \protect
\fi

\newcatcodetable \tikzcatcodes

\startcatcodetable \tikzcatcodes
    \catcode\tabasciicode             \spacecatcode
    \catcode\endoflineasciicode       \endoflinecatcode
    \catcode\formfeedasciicode        \endoflinecatcode
    \catcode\spaceasciicode           \spacecatcode
    \catcode\endoffileasciicode       \ignorecatcode
    \catcode\circumflexasciicode      \superscriptcatcode
    \catcode\underscoreasciicode      \subscriptcatcode
    \catcode\ampersandasciicode       \alignmentcatcode
    \catcode\backslashasciicode       \escapecatcode
    \catcode\leftbraceasciicode       \begingroupcatcode
    \catcode\rightbraceasciicode      \endgroupcatcode
    \catcode\dollarasciicode          \mathshiftcatcode
    \catcode\hashasciicode            \parametercatcode
    \catcode\commentasciicode         \commentcatcode
    \catcode\atsignasciicode          \lettercatcode
    \catcode\exclamationmarkasciicode \othercatcode
    \catcode\questionmarkasciicode    \lettercatcode
    \catcode\tildeasciicode           \activecatcode
    \catcode\barasciicode             \othercatcode
\stopcatcodetable

\permanent\protected\def\starttikzinput
  {\pushoverloadmode
   \pushcatcodetable
   \setcatcodetable\tikzcatcodes
   \pushmacro\meaning
   \let\meaning\meaningless
   \autoparagraphmode\zerocount}

\permanent\protected\def\stoptikzinput
  {\autoparagraphmode\plusone
   \popcatcodetable
   \popmacro\meaning
   \popoverloadmode}

\permanent\protected\def\tikzinputfile#1%
  {\starttikzinput
   \input{#1}\relax
   \stoptikzinput}

\permanent\protected\def\tikzerrormessage#1#2#3%
  {\writestatus{#1}{#2}}

% For now we need this but we need to educate the user to wrap settings in the
% wrappers. So some day the next line will go. I need to check what commands are
% possible outside a picture.

\overloadmode\zerocount

\newtoks\everytikzpicture
\newtoks\everyinsidetikzpicture

% \appendtoks
%     \resetcharacterspacing
% \to \everytikzpicture

\permanent\protected\def\starttikzsettings
  {\pushoverloadmode
   \pushmacro\meaning
   \let\meaning\meaningless
   \autoparagraphmode\zerocount}

\permanent\protected\def\stoptikzsettings
  {\autoparagraphmode\plusone
   \popmacro\meaning
   \popoverloadmode}

\permanent\protected\def\starttikzpicture
  {\dontleavehmode
   \hcontainer\bgroup
   \setcatcodetable\tikzcatcodes
   \the\everytikzpicture
   \autoparagraphmode\zerocount
   \pushmacro\meaning
   \let\meaning\meaningless
 % \pushoverloadmode
   \ifdefined\PackageError\else \let\PackageError\tikzerrormessage \fi
   \tikzpicture
   \the\everyinsidetikzpicture}

\permanent\protected\def\stoptikzpicture
  {\endtikzpicture
 % \popoverloadmode
   \popmacro\meaning
   \egroup}

\let\pgfdefined    \relax
\let\pgfcoredefined\relax

\tikzinputfile{pgfutil-common.tex}
\tikzinputfile{pgfutil-context.def}
\tikzinputfile{pgfrcs.code.tex}
\tikzinputfile{pgfsys.code.tex}
\tikzinputfile{pgfkeys.code.tex}
\tikzinputfile{pgfsyssoftpath.code.tex}
\tikzinputfile{pgfsysprotocol.code.tex}
\tikzinputfile{pgfcore.code.tex}
\tikzinputfile{pgffor.code.tex}
\tikzinputfile{pgfmoduleplot.code.tex}
\tikzinputfile{tikz.code.tex}

\let\startpgfpicture             \pgfpicture              \let\stoppgfpicture            \endpgfpicture
\let\startpgfscope               \pgfscope                \let\stoppgfscope              \endpgfscope
\let\startpgflowlevelscope       \pgflowlevelscope        \let\stoppgflowlevelscope      \endpgflowlevelscope
\let\startpgfinterruptpath       \pgfinterruptpath        \let\stoppgfinterruptpath      \endpgfinterruptpath
\let\startpgfinterruptpicture    \pgfinterruptpicture     \let\stoppgfinterruptpicture   \endpgfinterruptpicture
\let\startpgfinterruptboundingbox\pgfinterruptboundinbox  \let\stoppgfinterruptboudingbox\endpgfinterruptboundingbox

\let\normalusepgfmodule  \usepgfmodule
\let\normalusepgflibrary \usepgflibrary
\let\normalusetikzlibrary\usetikzlibrary

\tolerant\protected\def\usepgfmodule[#1]#;#2% somehow both variants are used
  {\starttikzinput
   \normalusepgfmodule[#1#2]%
   \stoptikzinput}

\tolerant\protected\def\usepgflibrary[#1]#;#2% somehow both variants are used
  {\starttikzinput
   \normalusepgflibrary[#1#2]%
   \stoptikzinput}

\tolerant\protected\def\usetikzlibrary[#1]#;#2% somehow both variants are used
  {\starttikzinput
   \normalusetikzlibrary[#1#2]%
   \stoptikzinput}

\usepgfmodule[shapes]
\usepgfmodule[plot]
\usepgfmodule[matrix]
\usepgfmodule[decorations]

\definefilesynonym [pgfplots]      [tikz-pgfplots]
\definefilesynonym [pgfplotstable] [tikz-pgfplotstable]

\stopmodule

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