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| From: | glen herrmannsfeldt <gah@ugcs.caltech.edu> |
| Newsgroups: | comp.compilers |
| Date: | 14 Aug 2006 15:06:41 -0400 |
| Organization: | Compilers Central |
| References: | 06-08-042 |
| Keywords: | C++, lex |
| Posted-Date: | 14 Aug 2006 15:06:41 EDT |
chtaylo3@gmail.com wrote:
(snip)
> I'm trying to determine if a given line is a C/C++ style comment.
(snip)
> [You need about 2/3 of a C++ lexer. You more or less need to
> scan for /* and then the matching */, except that you also need
> to look for quoted strings since "/*" is a string, not a comment.
> It's not that hard, with a lexer generator like flex you should
> be able to do it in a few hours. But people must have done this
> a hundred times before so I would first poke around on the net and
> see if there is code you can just steal. -John]
There is also the preprocessor to consider.
As I understand it, the OP is trying to understand how statement
counts change with editing, such as through diff.
Consider:
#if 0
/*
#endif
I pretty often use #if 0 to get around the non-nesting of comments,
and would never put a partial comment in a #if 0/#endif block,
but someone else might do it.
-- glen
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