reductions on YACC input buffers

Question

I need to perform grammar reductions, using yacc, on input from a string, so I've been looking at "yy_scan_string/yy_scan_bytes" although, from what ve seen, these only seem to be used in lexical scanning

Are there yacc equivalents of these routines, allowing such reductions on a string input and, if so, what are they?

Russell

Answer 1

A yacc-generated parser doesn't get its input from a file or a string or anything like that - it gets its input, which is a sequence of tokens, from yylex. It doesn't care whether yylex produces those tokens by reading from a file, a string or something else.

So there are no yacc equivalents of those functions because there don't need to be. Once you make your lexer read from a string, that's it, that's all you need to do. The parser will just take what it is given by the lexer.