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Carl Worth a65cf7b1d2 Make two list-processing functions do nothing with an empty list. 
This just makes these functions easier to understand all around.  In
the case of _token_list_append_list this is an actual bug fix, (where
append an empty list onto a non-empty list would previously scramble
the tail pointer of the original list).
2010-05-27 11:55:36 -07:00
main Add hash table implementation from glsl2 project. 2010-05-10 13:36:26 -07:00
tests Avoid treating an expanded comma as an argument separator. 2010-05-27 10:12:33 -07:00
.gitignore Add a very simple test for the pre-processor. 2010-05-10 16:21:10 -07:00
glcpp-lex.l Fix lexing of "defined" as an operator, not an identifier. 2010-05-26 09:37:14 -07:00
glcpp-parse.y Make two list-processing functions do nothing with an empty list. 2010-05-27 11:55:36 -07:00
glcpp.c Fix defines involving both literals and other defined macros. 2010-05-12 12:25:34 -07:00
glcpp.h Treat newlines as space when invoking a function-like macro invocation. 2010-05-26 16:04:31 -07:00
hash_table.c Add hash table implementation from glsl2 project. 2010-05-10 13:36:26 -07:00
hash_table.h Add hash table implementation from glsl2 project. 2010-05-10 13:36:26 -07:00
Makefile Add a wrapper function around the lexer. 2010-05-19 10:01:29 -07:00
README Treat newlines as space when invoking a function-like macro invocation. 2010-05-26 16:04:31 -07:00
xtalloc.c Add xtalloc_reference. 2010-05-25 14:40:47 -07:00

README 

glcpp -- GLSL "C" preprocessor

This is a simple preprocessor designed to provide the preprocessing
needs of the GLSL language. The requirements for this preprocessor are
specified in the GLSL 1.30 specification availble from:

http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.30.08.pdf

This specification is not precise on some semantics, (for example,
#define and #if), defining these merely "as is standard for C++
preprocessors". To fill in these details, I've been using the C99
standard (for which I had a convenient copy) as available from:

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1124.pdf

Known limitations
-----------------
Macro invocations cannot include embedded newlines.

The __LINE__, __FILE__, and __VERSION__ macros are not yet supported.

The argument of the 'defined' operator cannot yet include enclosing
parentheses.

The #error, #pragma, #extension, #version, and #line macros are not
yet supported.

A file that ends with a function-like macro name as the last
non-whitespace token will result in a parse error, (where it should be
passed through as is).