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/*
* $Id: AlternativePattern.java,v 1.10 2010-11-01 04:34:15 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import com.sun.org.apache.bcel.internal.generic.GOTO;
import com.sun.org.apache.bcel.internal.generic.InstructionHandle;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
final class AlternativePattern extends Pattern {
private final Pattern _left;
private final Pattern _right;
/**
* Construct an alternative pattern. The method setParent
* should not be called in this case.
*/
public AlternativePattern(Pattern left, Pattern right) {
_left = left;
_right = right;
}
public void setParser(Parser parser) {
super.setParser(parser);
_left.setParser(parser);
_right.setParser(parser);
}
public Pattern getLeft() {
return _left;
}
public Pattern getRight() {
return _right;
}
/**
* The type of an '|' is not really defined, hence null is returned.
*/
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
_left.typeCheck(stable);
_right.typeCheck(stable);
return null;
}
public double getPriority() {
double left = _left.getPriority();
double right = _right.getPriority();
if (left < right)
return(left);
else
return(right);
}
public String toString() {
return "alternative(" + _left + ", " + _right + ')';
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final InstructionList il = methodGen.getInstructionList();
_left.translate(classGen, methodGen);
final InstructionHandle gotot = il.append(new GOTO(null));
il.append(methodGen.loadContextNode());
_right.translate(classGen, methodGen);
_left._trueList.backPatch(gotot);
_left._falseList.backPatch(gotot.getNext());
_trueList.append(_right._trueList.add(gotot));
_falseList.append(_right._falseList);
}
}