Macros which scan subscripts/superscripts in ConTeXt
Hi, list! I've seen the following in Stack Exchange: https://tex.stackexchange.com/questions/503208/define-macro-that-scans-ahead... The answer is: \documentclass{article}\usepackage{amsmath}\usepackage{xparse} \NewDocumentCommand{\mymathsym}{e{^_}}{% x^{\mathrm{foo}\IfValueT{#1}{,#1}}_{\mathrm{bar}\IfValueT{#2}{,#2}}%} \begin{document} \begin{gather}\mymathsym \\\mymathsym^{\mathrm{extrasup}} \\\mymathsym_{\mathrm{extrasub}} \\\mymathsym^{\mathrm{extrasup}}_{\mathrm{extrasub}} \\\mymathsym_{\mathrm{extrasub}}^{\mathrm{extrasup}} \end{gather} \end{document} Such a macro contextually defines a behavior for a subscript and a superscript even if they aren't displayed in a specific order, so \mymacro_{a}^{b} \mymacro^{b}_{a} have the same output, even if the intended behavior is not the typical one (I could redefine it so subscripts change colors, for instance). Although I could just port the macro using xparse-generic because it works in ConTeXt too, how to define a macro like that the ConTeXt way, i.e., using only ConTeXt macros? Thank you in advance. Jairo :)
On Thu, 25 Jun 2020, Jairo A. del Rio wrote:
Hi, list! I've seen the following in Stack Exchange:
https://tex.stackexchange.com/questions/503208/define-macro-that-scans-ahead...
The answer is:
\documentclass{article}\usepackage{amsmath}\usepackage{xparse} \NewDocumentCommand{\mymathsym}{e{^_}}{% x^{\mathrm{foo}\IfValueT{#1}{,#1}}_{\mathrm{bar}\IfValueT{#2}{,#2}}%} \begin{document} \begin{gather}\mymathsym \\\mymathsym^{\mathrm{extrasup}} \\\mymathsym_{\mathrm{extrasub}} \\\mymathsym^{\mathrm{extrasup}}_{\mathrm{extrasub}} \\\mymathsym_{\mathrm{extrasub}}^{\mathrm{extrasup}} \end{gather} \end{document}
Such a macro contextually defines a behavior for a subscript and a superscript even if they aren't displayed in a specific order, so
\mymacro_{a}^{b}
\mymacro^{b}_{a}
have the same output, even if the intended behavior is not the typical one (I could redefine it so subscripts change colors, for instance). Although I could just port the macro using xparse-generic because it works in ConTeXt too, how to define a macro like that the ConTeXt way, i.e., using only ConTeXt macros?
Return of the dodo :-) % Must be outside \unprotect .. \protect so that _ has usual catcodes \def\capturemathoplimits#1% {\doifnextcharelse _% {\docapturemathoplimitsA{#1}} {\doifnextcharelse ^% {\docapturemathoplimitsB{#1}} {\redocapturemathoplimits{#1}}}} \def\docapturemathoplimitsA#1#2#3% {\doifnextcharelse ^% {\dodocapturemathoplimitsA{#1}{#2}{#3}} {\dodocapturemathoplimitsA{#1}{#2}{#3}\empty\empty}} \def\dodocapturemathoplimitsA#1#2#3#4#5{#1{#5}{#3}} \def\docapturemathoplimitsB#1#2#3% {\doifnextcharelse _% {\dodocapturemathoplimitsB{#1}{#2}{#3}} {\dodocapturemathoplimitsB{#1}{#2}{#3}\empty\empty}} \def\dodocapturemathoplimitsB#1#2#3#4#5{#1{#3}{#5}} \def\redocapturemathoplimits#1{#1\empty\empty\empty\empty\empty} % Usage: \define\mymacro{\capturemathoplimits\domymacro} \def\domymacro#1#2% % #1 is supscript, #2 is subscript {x^{\mathrm{foo}\doifsomething{#1}{,#1}}_{\mathrm{bar}\doifsomething{#2}{,#2}}} \starttext \startlines $\mymacro$ $\mymacro^{\mathrm{extrasup}}$ $\mymacro_{\mathrm{extrasub}}$ $\mymacro^{\mathrm{extrasup}}_{\mathrm{extrasub}}$ $\mymacro_{\mathrm{extrasub}}^{\mathrm{extrasup}}$ \stoplines \stoptext Aditya
On 6/26/2020 3:47 AM, Aditya Mahajan wrote:
On Thu, 25 Jun 2020, Jairo A. del Rio wrote:
Hi, list! I've seen the following in Stack Exchange:
https://tex.stackexchange.com/questions/503208/define-macro-that-scans-ahead...
The answer is:
\documentclass{article}\usepackage{amsmath}\usepackage{xparse} \NewDocumentCommand{\mymathsym}{e{^_}}{% x^{\mathrm{foo}\IfValueT{#1}{,#1}}_{\mathrm{bar}\IfValueT{#2}{,#2}}%} \begin{document} \begin{gather}\mymathsym \\\mymathsym^{\mathrm{extrasup}} \\\mymathsym_{\mathrm{extrasub}} \\\mymathsym^{\mathrm{extrasup}}_{\mathrm{extrasub}} \\\mymathsym_{\mathrm{extrasub}}^{\mathrm{extrasup}} \end{gather} \end{document}
Such a macro contextually defines a behavior for a subscript and a superscript even if they aren't displayed in a specific order, so
\mymacro_{a}^{b}
\mymacro^{b}_{a}
have the same output, even if the intended behavior is not the typical one (I could redefine it so subscripts change colors, for instance). Although I could just port the macro using xparse-generic because it works in ConTeXt too, how to define a macro like that the ConTeXt way, i.e., using only ConTeXt macros?
Return of the dodo :-)
% Must be outside \unprotect .. \protect so that _ has usual catcodes \def\capturemathoplimits#1% {\doifnextcharelse _% {\docapturemathoplimitsA{#1}} {\doifnextcharelse ^% {\docapturemathoplimitsB{#1}} {\redocapturemathoplimits{#1}}}}
\def\docapturemathoplimitsA#1#2#3% {\doifnextcharelse ^% {\dodocapturemathoplimitsA{#1}{#2}{#3}} {\dodocapturemathoplimitsA{#1}{#2}{#3}\empty\empty}}
\def\dodocapturemathoplimitsA#1#2#3#4#5{#1{#5}{#3}}
\def\docapturemathoplimitsB#1#2#3% {\doifnextcharelse _% {\dodocapturemathoplimitsB{#1}{#2}{#3}} {\dodocapturemathoplimitsB{#1}{#2}{#3}\empty\empty}}
\def\dodocapturemathoplimitsB#1#2#3#4#5{#1{#3}{#5}}
\def\redocapturemathoplimits#1{#1\empty\empty\empty\empty\empty}
% Usage:
\define\mymacro{\capturemathoplimits\domymacro}
\def\domymacro#1#2% % #1 is supscript, #2 is subscript
{x^{\mathrm{foo}\doifsomething{#1}{,#1}}_{\mathrm{bar}\doifsomething{#2}{,#2}}}
\starttext \startlines $\mymacro$ $\mymacro^{\mathrm{extrasup}}$ $\mymacro_{\mathrm{extrasub}}$ $\mymacro^{\mathrm{extrasup}}_{\mathrm{extrasub}}$ $\mymacro_{\mathrm{extrasub}}^{\mathrm{extrasup}}$ \stoplines \stoptext We could have this:
\unexpanded\def\scripts {\scratchtoksone\emptytoks \scratchtokstwo\emptytoks \doscriptscheck} \def\doscriptscheck {\doifnextcharelse _% \doscriptssub {\doifnextcharelse ^% \doscriptssup \doscriptsflush}} \def\doscriptsflush {\doifsometoks\scratchtoksone{^{\the\scratchtoksone}}% \doifsometoks\scratchtokstwo{_{\the\scratchtokstwo}}} \def\doscriptssup ^#1% {\doifelsesometoks\scratchtoksone {\appendtoks,{#1}\to\scratchtoksone} {\scratchtoksone{{#1}}}% \doscriptscheck} \def\doscriptssub _#1% {\doifelsesometoks\scratchtokstwo {\appendtoks,{#1}\to\scratchtokstwo} {\scratchtokstwo{{#1}}}% \doscriptscheck} % % a bit more low level: % \unexpanded\def\scripts % {\scratchtoksone\emptytoks % \scratchtokstwo\emptytoks % \doscriptscheck} % % \def\doscriptscheck % {\doifnextcharelse ^% % {\doscriptsstep\scratchtoksone} % {\doifnextcharelse _% % {\doscriptsstep\scratchtokstwo} % {\doscriptsflush}}} % % \def\doscriptsflush % {\iftok\scratchtoksone\emptytoks\else\Usuperscript{\the\scratchtoksone}\fi% % \iftok\scratchtokstwo\emptytoks\else\Usubscript {\the\scratchtokstwo}\fi} % % \def\doscriptsstep#1#1#3% % {\etoksapp#1{\iftok#1\emptytoks\else,\fi\normalunexpanded{#3}}% % \doscriptscheck} \starttext \startlines $z\scripts _{\rm one} _{\bf two} ^{one} _{ three} ^{\bi two}$ \stoplines \stoptext ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------
participants (3)
-
Aditya Mahajan -
Hans Hagen -
Jairo A. del Rio