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 Re: LaTeX3 and engines Joseph Wright <[log in to unmask]> Sun, 2 Jan 2011 11:45:58 +0000 text/plain (31 lines) On 01/01/2011 21:16, Arno Trautmann wrote: > Paul Thompson wrote: >> What sort of documentation is available for \pdfstrcmp? I confess that I have >> never heard of this toolset. > > pdfTeX manual says: > > \pdfstrcmp (expandable) > This command compares two strings and expands to 0 if the strings are > equal, to -1 if the first string ranks before the second, and to 1 > otherwise. The primitive was introduced in pdfTEX 1.30.0. > > searching the internet may bring even more information. Like many of the newer pdfTeX primitives, there is to some extend a need to 'suck it and see' to find out what happens. For LaTeX3, all we do is use the 'equal' test. The test does expansion, so to test two token lists as strings without any expansion, you do \def\StringCompareTF#1#2{%    \ifnum\pdfstrcmp{\unexpanded{#1}}{\unexpanded{#2}}=\z@      \expandafter\@firstoftwo    \else      \expandafter\@secondoftwo    \fi } or code to that effect. -- Joseph Wright