Hi Hartmut, thank you! That was amazing fast. I tried the new hook and I am now able to get all the information I need. Thank you very much for the fast help. -chris On Sun, Feb 7, 2010 at 5:07 PM, Hartmut Kaiser <hartmut.kaiser@gmail.com> wrote:
Christopher,
that sounds perfect.
When passing the line, i think, possible comments should be stripped to prevent problems when this line is stripped from the output. The on_illformed hook should also have a boolean return value signaling to pass the line to the output or to strip it (similar to other hooks).
Ok, I added the following preprocessing hook to Wave:
/////////////////////////////////////////////////////////////////////////// // // The function 'found_unknown_directive' is called whenever an unknown // preprocessor directive was encountered. // // The parameter 'ctx' is a reference to the context object used for // instantiating the preprocessing iterators by the user. // // The parameter 'line' holds the tokens of the entire source line // containing the unknown directive. // // The parameter 'pending' may be used to push tokens back into the input // stream, which are to be used as the replacement text for the whole // line containing the unknown directive. // // The return value defines whether the given expression has been // properly interpreted by the hook function or not. If this function // returns 'false', the library will raise an 'ill_formed_directive' // preprocess_exception. Otherwise the tokens pushed back into 'pending' // are passed on to the user program. // /////////////////////////////////////////////////////////////////////////// template <typename Context, typename Container> bool found_unknown_directive(Context const& ctx, Container const& line, Container& pending) { return false; // by default we never interpret unknown directives }
Depending on the settings comments are either retained or stripped _before_ invoking this hook function. For instance for a line:
#version 150 core // some comment
the parameter 'line' will contain the following tokens:
T_POUND "#" T_IDENTIFIER "version" T_SPACE " " T_PP_NUMBER "150" T_SPACE " " T_IDENTIFIER "core" T_NEWLINE "\n"
(if comments are to be stripped), or:
T_POUND "#" T_IDENTIFIER "version" T_SPACE " " T_PP_NUMBER "150" T_SPACE " " T_IDENTIFIER "core" T_CPPCOMMENT "// some comment\n"
if those are to be retained.
A new example (custom_directives.cpp) demonstrates its usage.
HTH Regards Hartmut
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