From: Carl Worth Date: Sat, 21 Jan 2012 17:24:11 +0000 (-0800) Subject: glcpp: Fix so that trailing punctuation does not prevent macro expansion X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=7ab1c7f7926c75a07f33eb149d0fc17dcfaffd5e;p=mesa.git glcpp: Fix so that trailing punctuation does not prevent macro expansion The trick here is that flex always chooses the rule that matches the most text. So with a input text of "two:" which we want to be lexed as an IDENTIFIER token "two" followed by an OTHER token ":" the previous OTHER rule would match longer as a single token of "two:" which we don't want. We prevent this by forcing the OTHER pattern to never match any characters that appear in other constructs, (no letters, numbers, #, _, whitespace, nor any punctuation that appear in CPP operators). Fixes bug #44764: GLSL preprocessor doesn't replace defines ending with ":" https://bugs.freedesktop.org/show_bug.cgi?id=44764 Reviewed-by: Kenneth Graunke NOTE: This is a candidate for stable release branches. --- diff --git a/src/glsl/glcpp/glcpp-lex.l b/src/glsl/glcpp/glcpp-lex.l index 86618870885..b34f2c0e9ad 100644 --- a/src/glsl/glcpp/glcpp-lex.l +++ b/src/glsl/glcpp/glcpp-lex.l @@ -70,7 +70,15 @@ HSPACE [ \t] HASH ^{HSPACE}*#{HSPACE}* IDENTIFIER [_a-zA-Z][_a-zA-Z0-9]* PUNCTUATION [][(){}.&*~!/%<>^|;,=+-] -OTHER [^][(){}.&*~!/%<>^|;,=#[:space:]+-]+ + +/* The OTHER class is simply a catch-all for things that the CPP +parser just doesn't care about. Since flex regular expressions that +match longer strings take priority over those matching shorter +strings, we have to be careful to avoid OTHER matching and hiding +something that CPP does care about. So we simply exclude all +characters that appear in any other expressions. */ + +OTHER [^][_#[:space:]#a-zA-Z0-9(){}.&*~!/%<>^|;,=+-] DIGITS [0-9][0-9]* DECIMAL_INTEGER [1-9][0-9]*[uU]?