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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.semantics.rule;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import com.yahoo.prelude.semantics.engine.RuleEvaluation;
/**
* A list of the productions of a rule
*
* @author bratseth
*/
public class ProductionList {
private List<Production> productions =new java.util.ArrayList<>();
/** True to replace by the production, false to add it */
private boolean replacing=true;
public void addProduction(Production term) {
term.setReplacing(replacing);
term.setPosition(productions.size());
productions.add(term);
}
/** True to replace, false to add, default true */
void setReplacing(boolean replacing) {
for (Iterator<Production> i=productions.iterator(); i.hasNext(); ) {
Production production=i.next();
production.setReplacing(replacing);
}
this.replacing=replacing;
}
/** Returns an unmodifiable view of the productions in this */
public List<Production> productionList() { return Collections.unmodifiableList(productions); }
public int getTermCount() { return productions.size(); }
void addMatchReferences(Set<String> matchReferences) {
for (Iterator<Production> i=productions.iterator(); i.hasNext(); ) {
Production term=i.next();
term.addMatchReferences(matchReferences);
}
}
public void produce(RuleEvaluation e) {
for (int i=0; i<productions.size(); i++) {
productions.get(i).produce(e,i);
}
}
public String toString() {
StringBuilder buffer=new StringBuilder();
for (Iterator<Production> i=productions.iterator(); i.hasNext(); ) {
buffer.append(i.next().toString());
if (i.hasNext())
buffer.append(" ");
}
return buffer.toString();
}
}
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