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browny

Scripting....

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How do i add scripting support to my VC++ program. Although I just need to evaluate mathematical expressions at run-time, nothing more than that. Any help would be highly appreciated....
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Ouch - it can be a little hard; unless you're talking _VERY_ simple expressions, you'll have to write a lexer & parser, create a tree for the expression, then walk it to evalutate the expression.

ANTLR is a tool for creating lexers & parsers...this also has a simple calculator as one of it's examples...I extended it as a learning exercise to handle fairly complex expressions without too much difficulty, I suggest you have a play with the examples to help figuring Antlr out
www.antlr.org - Antlr's home page

Have a look on www.flipcode.com, they did a series on writing a simple script engine sometimes last year - its in their tutorial sections

The best known tools for compiler construction are 'lex' and 'yacc' ('flex' & 'bison' respectivly for non-unix systems) - they're all over the place & (I suppose) freeware - I've never used these myself...but they're always mentioned...but fairly old

Edited by - NickB on November 24, 2001 8:43:57 PM
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