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Design for hspp
First pass:
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* traverse the file,
- processing #if's and #ifdef's
- reading #include's and recursively doing this pass on them
- leaving #line's behind
- whilst taking account of #define's and #undef's
* only needs to look at lines beginning with a #
* should discard C-style comments? (no)
* DO NOT gather the #define's for macros - their sequence matters!
pass1 :: SymTab -> String -> String
Second pass:
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* traverse the residual file,
- keeping track of #define'd macros
- expanding #define'd macros when an instance is encountered
* needs a whitespace-preserving tokeniser with odd rules to
cover e.g. token concatenation. Within Haskell, quotation marks start
strings, haskell comments are preserved. Within a cpp directive,
quotation marks do not start a string, and C-style comments are
converted to whitespace.
* Line continuation characters are tricky; probably should only
be recognised within a macro definition, not in ordinary code.
pass2 :: SymTab -> String -> String
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