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* maint: maint: post-release administrivia version 3.5.4 examples: reccalc: really compile cleanly in C99 news: announce that Bison 3.6 drops YYERROR_VERBOSE news: update for 3.5.4 style: fix spellos typo: succesful -> successful package: improve the readme java: check and fix support for api.token.raw java: style: prefer 'int[] foo' to 'int foo[]' build: fix syntax-check issues tests: recheck: work properly when the test suite was interrupted doc: c++: promote api.token.raw build: fix compatibility with old compilers examples: reccalc: compile cleanly in C99
reccalc - recursive calculator with Flex and Bison
In this example the generated parser is pure and reentrant: it can be used concurrently in different threads, or recursively. As a proof of this reentrancy, expressions in parenthesis are tokenized as strings, and then recursively parsed from the parser:
exp: STR
{
result r = parse_string ($1);
free ($1);
if (r.nerrs)
{
res->nerrs += r.nerrs;
YYERROR;
}
else
$$ = r.value;
}