fp

git-svn-id: svn://tug.org/texlive/trunk@939 c570f23f-e606-0410-a88d-b1316a301751

1 files changed, 31 insertions, 0 deletions

diff --git a/Master/texmf-dist/tex/latex/fp/defpattern.sty b/Master/texmf-dist/tex/latex/fp/defpattern.sty
new file mode 100644
index 00000000000..1d5787ff13f
--- /dev/null
+++ b/Master/texmf-dist/tex/latex/fp/defpattern.sty
@@ -0,0 +1,31 @@
+\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]}}
+