62 lines
No EOL
1.5 KiB
C++
62 lines
No EOL
1.5 KiB
C++
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#include "NewPlacement.hpp"
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#include "CfGrammar.hpp"
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using namespace tp;
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bool CfGrammar::compile() {
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if (!rules.length()) {
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printf("Grammar must have at leas one rule\n");
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return false;
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}
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if (startTerminal == String()) {
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printf("Using first rule's non-terminal as grammar's root. Define explicitly - 'Start : id'\n");
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startTerminal = rules.first()->data.id;
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}
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// find all rules
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for (auto rule : rules) {
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if (!rule->args.length()) {
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printf("Rule must have at leas one terminal or non-terminal. See rule '%s'\n", rule->id.read());
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return false;
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}
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if (!mNonTerminals.presents(rule->id)) {
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mNonTerminals.put(rule->id, {});
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}
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auto nonTerminal = &mNonTerminals.get(rule->id);
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nonTerminal->rules.pushBack(&rule.data());
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}
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for (auto nonTerminal : mNonTerminals) {
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for (auto rule : nonTerminal->val.rules) {
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for (auto arg : rule->args) {
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if (arg->isTerminal) {
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mTerminals.put(rule->id, {});
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} else {
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auto idx = mNonTerminals.presents(arg->id);
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if (!idx) {
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printf("Referenced non-terminal '%s' is not defined\n", arg->id.read());
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return false;
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}
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auto reference = &mNonTerminals.getSlotVal(idx);
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reference->references.put(nonTerminal->key, &nonTerminal->val);
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nonTerminal->val.referencing.put(arg->id, reference);
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}
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}
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}
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}
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for (auto nonTerminal : mNonTerminals) {
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if (!nonTerminal->val.references.size() && nonTerminal->key != startTerminal) {
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printf("Non-terminal '%s' is defined but not used\n", nonTerminal->key.read());
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}
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}
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return true;
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} |