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This is something that has always bothered me: with pure parsers (and they all should be) the user does not have an (easy) access to yynerrs at the end of the parse. In the case of error recovery, that's the only direct means to know if there were errors. The usual approach being having the user maintain a counter incremented each time yyerror is called. So here, also capture yynerrs in the return value of the start-symbol parsing functions. * data/skeletons/yacc.c (yy_parse_impl_t): New. (yy_parse_impl): Use it. (b4_accept): Fill it. * examples/c/lexcalc/parse.y, examples/c/lexcalc/scan.l: No longer pass nerrs as lex- and parse-param, just use the resulting yynerrs. bistromathic and reccalc both demonstrate %param.
This directory contains examples of Bison grammar files, sorted per language.
Several of them come from the documentation, which should be installed together with Bison. The URLs are provided for convenience.
These examples come with a README and a Makefile. Not only can they be used to toy with Bison, they can also be starting points for your own grammars.
Please, be sure to read the C examples before looking at the other languages, as these examples are simpler.