On Tue, Aug 23, 2005 at 08:04:10PM +0000, Cedric wrote:
Hi all,
I've been programming in C/C++ now, and i found that no editor i've tried can
highlight variables.
In C you have to declaire the variables before you can use them, so i think it
should be possible to detect them, and then give them a color.
Has anybody already seen an editor who does that?
Probably none exist.
Typically a highlight engine works on regular expression, which is
type-3 grammar. The C syntax is a context free grammar, which is
type-2 grammar. Needless to say that a c parser is much more complex
than the regular engine (comparing lexing and parsing). What you are
asking for, however, is further into semantic parsing. For the minimum
it is a context sensitive problem, which goes to type-1 grammar. A
bullet-proof solution to your request is very complex.
However, if we assume the C source follows certain style so that
simple regex parsing is sufficient to catch all the variable
declarations and scoping and variable referring, a simpler solution
may exist.
Greets,
--
Hui Zhou
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