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handle charset left-hand-side in LALR compile

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This commit is contained in:
Sven M. Hallberg 2015-09-16 18:43:52 +02:00
parent 31c460780f
commit 422f88c4aa
1 changed files with 22 additions and 7 deletions
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23
src/backends/lalr.c
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@ -286,14 +286,28 @@ int h_lalr_compile(HAllocator* mm__, HParser* parser, const void* params)
HHashSet *lhss = h_hashtable_get(eg->corr, item->lhs);
assert(lhss != NULL);
H_FOREACH_KEY(lhss, HCFChoice *lhs)
assert(lhs->type == HCF_CHOICE); // XXX could be CHARSET?
assert(lhs->type == HCF_CHOICE || lhs->type == HCF_CHARSET);
bool match = false;
if(lhs->type == HCF_CHOICE) {
for(HCFSequence **p=lhs->seq; *p; p++) {
HCFChoice **rhs = (*p)->items;
if(!match_production(eg, rhs, item->rhs, state)) {
continue;
if(match_production(eg, rhs, item->rhs, state)) {
match = true;
break;
}
}
} else { // HCF_CHARSET
assert(item->rhs[0] != NULL);
assert(item->rhs[1] == NULL);
assert(item->rhs[0]->type == HCF_CHAR);
HLRTransition *t = h_hashtable_get(eg->smap, lhs);
assert(t != NULL);
match = (t->to == state
&& charset_isset(lhs->charset, item->rhs[0]->chr));
}
if(match) {
// the left-hand symbol's follow set is this production's
// contribution to the lookahead
const HStringMap *fs = h_follow(1, eg->grammar, lhs);
@ -304,7 +318,8 @@ int h_lalr_compile(HAllocator* mm__, HParser* parser, const void* params)
// for each lookahead symbol, put action into table cell
if(terminals_put(table->tmap[state], fs, action) < 0)
inadeq = true;
} H_END_FOREACH // enhanced production
}
H_END_FOREACH // enhanced production
H_END_FOREACH // reducible item
if(inadeq) {