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gram: factor the printing of items and the computation of their rule

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There are several places where we need to recover the rule from an
item, let's factor that into item_rule.  We also want to print items
in a nice way: we do it when generating the *output file, but it is
also useful in debug messages.

* src/gram.h, src/gram.c (item_rule, item_print): New.
* src/print.c (print_core): Use them.
* src/state.h, src/state.c: Propagate constness.
This commit is contained in:
Akim Demaille
2019-01-28 19:05:38 +01:00
parent c4f143eb96
commit e1783bc686
6 changed files with 53 additions and 31 deletions
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29
src/gram.c
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@@ -48,6 +48,35 @@ int max_user_token_number = 256;
int required_version = 0;
rule const *
item_rule (item_number const *item)
{
item_number const *sp = item;
while (*sp >= 0)
++sp;
rule_number r = item_number_as_rule_number (*sp);
return &rules[r];
}
void
item_print (item_number *item, rule const *previous_rule, FILE *out)
{
rule const *r = item_rule (item);
rule_lhs_print (r, previous_rule ? previous_rule->lhs : NULL, out);
for (item_number *sp = r->rhs; sp < item; sp++)
fprintf (out, " %s", symbols[*sp]->tag);
fputs (" .", out);
if (0 <= *r->rhs)
for (item_number *sp = item; 0 <= *sp; ++sp)
fprintf (out, " %s", symbols[*sp]->tag);
else
fprintf (out, " %%empty");
}
bool
rule_useful_in_grammar_p (rule const *r)
{