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CFG remove unused rules

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IlushaShurupov 2023-08-12 08:27:50 +03:00 • committed by Ilya Shurupov
parent 2c8151ec3e
commit 16115b483a
3 changed files with 20 additions and 0 deletions
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11
Parser/private/CfGrammar.cpp
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@ -128,11 +128,22 @@ bool CfGrammar::compile() {
}
}
List<String> remove;
for (auto nonTerminal : mNonTerminals) {
if (!nonTerminal->val.references.size() && nonTerminal->key != startTerminal) {
printf("Non-terminal '%s' is defined but not used\n", nonTerminal->key.read());
remove.pushBack(nonTerminal->key);
}
}
for (auto rem : remove) {
auto nonTerminal = &mNonTerminals.get(rem.data());
for (auto referencing : nonTerminal->referencing) {
referencing->val->references.remove(nonTerminal->rules.first()->data->id);
}
for (auto rule : nonTerminal->rules) {
rules.removeNode(rules.find(*rule.data()));
}
}
return true;
}