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authorKarl Berry <karl@freefriends.org>2006-01-12 23:56:09 +0000
committerKarl Berry <karl@freefriends.org>2006-01-12 23:56:09 +0000
commit3c45ead856093bda97671c92bbc3fa9768918e91 (patch)
tree7cd45d8624b1693f5f61f9221074075d817feab2 /Master/texmf-dist/tex/latex/fp/defpattern.sty
parentf608edbff24385a77c97e230f31fe5c1fb422a71 (diff)
fp
git-svn-id: svn://tug.org/texlive/trunk@939 c570f23f-e606-0410-a88d-b1316a301751
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+++ b/Master/texmf-dist/tex/latex/fp/defpattern.sty
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+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{defpattern}[1994/10/12]
+
+\message{%
+ `\string\defpattern-macro (adapted from \string\howto\space (A. Jeffrey: TeX and TUG NEWS 2(2)))'%
+}
+
+%define a macro \defpattern for defining ML-like pattern matching macros
+%adapted from the \howto-macro from tugboat
+
+\def\xcs#1#2{\expandafter#1\csname#2\endcsname}
+\newcount\actioncount
+\def\defpattern#1[#2]#3{%
+ \xcs\ifx{\expandafter\gobble\string#1}\relax%
+ \def#1{\erroraction#1}\fi%
+ \advance\actioncount by 1\relax%
+ \expandafter\defaction\expandafter{#1}{#3}{#2}%
+ \def\temp##1##2##3##4##5##6##7##8##9{\def\temp{[#2]}}%
+ \temp\empty\empty\empty\empty\empty\empty\empty\empty\empty%
+ \edef#1{\noexpand\doaction\xcs\noexpand%
+ {action-\the\actioncount}\temp}}
+\def\defaction#1#2#3{%
+ \xcs\def{action-\the\actioncount}##1[#3]{\applyto{#1}{#2}}}
+\def\gobble#1{}
+\def\applyto#1#2#3{#3{#1}{#2}}
+\def\doaction#1[#2][#3]{#1[#3]\success[#2]\failure[#3]}
+\def\success#1#2[#3]\failure[#4]{#2}
+\def\failure#1#2{#1}
+\def\erroraction#1[#2]{%
+ \errmessage{I don't know how to \string#1[#2]}}
+