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examples: lexcalc: demonstrate location tracking

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The bistromathic example should not use Flex, it makes it too complex.
But it was the only example to show location tracking with Flex.

* examples/c/lexcalc/lexcalc.test, examples/c/lexcalc/parse.y,
* examples/c/lexcalc/scan.l: Demonstrate location tracking as is done
in bistromathic.
This commit is contained in:
Akim Demaille
2020-02-29 09:54:34 +01:00
parent b870d5fee4
commit 388e12ac0f
8 changed files with 46 additions and 16 deletions
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2
examples/c/bistromathic/README.md
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@@ -3,7 +3,7 @@ This example demonstrates the best practices when using Bison.
- Its interface is pure.
- It uses a custom syntax error with location tracking, lookahead correction
and token internationalization.
- It enables debug trace support with formatting of semantic values.
- It supports debug traces with semantic values.
- It uses named references instead of the traditional $1, $2, etc.
It also uses Flex to generate the scanner.

4
examples/c/bistromathic/parse.y
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@@ -209,10 +209,10 @@ yyreport_syntax_error (const yyparse_context_t *ctx)
}
// Called by yyparse on error.
void yyerror (YYLTYPE *loc, char const *s)
void yyerror (YYLTYPE *loc, char const *msg)
{
YY_LOCATION_PRINT (stderr, *loc);
fprintf (stderr, ": %s\n", s);
fprintf (stderr, ": %s\n", msg);
}
int main (int argc, char const* argv[])