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package bjc.rgens.parser.elements;
import bjc.utils.data.IPair;
import bjc.utils.data.Pair;
import bjc.rgens.parser.GrammarException;
import bjc.rgens.parser.GenerationState;
import bjc.rgens.parser.Rule;
import bjc.rgens.parser.RGrammar;
public class RuleVariableCaseElement extends VariableCaseElement {
public final boolean exhaust;
public RuleVariableCaseElement(String varName, String varDef, boolean exhaust) {
super(varName, varDef, VariableType.RULE);
this.exhaust = exhaust;
}
public void generate(GenerationState state) {
Rule rl;
RGrammar grm;
if(state.rules.containsKey(varDef)) {
rl = state.rules.get(varDef);
grm = state.gram;
} else if(state.importRules.containsKey(varDef)) {
grm = state.importRules.get(varDef);
rl = grm.getRules().get(varDef);
} else {
throw new GrammarException("Can't create variable referencing non-existent rule " + varDef);
}
if(exhaust) rl = rl.exhaust();
if(state.rlVars.containsKey(varName)) {
IPair<RGrammar, Rule> par = state.rlVars.get(varName);
System.err.printf("WARN: Shadowing rule variable '%s' (%s with %s)\n",
varName, par.getRight().name, rl.name);
}
state.rlVars.put(varName, new Pair<>(grm, rl));
if(exhaust) {
System.err.printf("\t\tTRACE: Defined exhausted rulevar '%s' ('%s')\n", varName, varDef);
} else {
System.err.printf("\t\tTRACE: Defined rulevar '%s' ('%s')\n", varName, varDef);
}
}
}
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