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parser debugging output: strip token name prefixes #23898

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Merged
merged 1 commit into from
Nov 6, 2025
+24 −2
Merged

parser debugging output: strip token name prefixes #23898

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26 changes: 24 additions & 2 deletions perly.c
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Original file line number Diff line number Diff line change
Expand Up @@ -128,6 +128,15 @@ yysymprint(pTHX_ PerlIO * const yyoutput, int yytype, const YYSTYPE * const yyva
}


/* common prefixes of token names to strip when displaying in compact form
*/
static const char *name_prefixes[] = {
"PERLY_",
"KW_",
"bare_statement_",
NULL,
};

/* yy_stack_print()
* print the top 8 items on the parse stack.
*/
Expand All @@ -150,8 +159,21 @@ yy_stack_print (pTHX_ const yy_parser *parser)
PerlIO_printf(Perl_debug_log, " %8d", ps->state);

PerlIO_printf(Perl_debug_log, "\ntoken:");
for (ps = min; ps <= parser->ps; ps++)
PerlIO_printf(Perl_debug_log, " %8.8s", ps->name);
for (ps = min; ps <= parser->ps; ps++) {
const char *name = ps->name;
const char **p = name_prefixes;
/* strip some common prefixes off the name to better display
* truncated names */
for (; *p; p++) {
const char *prefix = *p;
STRLEN l = strlen(prefix);
if (strnEQ(name, prefix, l)) {
name += l;
break;
}
}
PerlIO_printf(Perl_debug_log, " %8.8s", name);
}

PerlIO_printf(Perl_debug_log, "\nvalue:");
for (ps = min; ps <= parser->ps; ps++) {
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