com.sun.org.apache.xalan.internal.xsltc.compiler.ParentPattern Maven / Gradle / Ivy
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/*
* $Id: ParentPattern.java,v 1.10 2010-11-01 04:34:17 joehw Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.ILOAD;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.ISTORE;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.LocalVariableGen;
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;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
final class ParentPattern extends RelativePathPattern {
private final Pattern _left;
private final RelativePathPattern _right;
public ParentPattern(Pattern left, RelativePathPattern right) {
(_left = left).setParent(this);
(_right = right).setParent(this);
}
public void setParser(Parser parser) {
super.setParser(parser);
_left.setParser(parser);
_right.setParser(parser);
}
public boolean isWildcard() {
return false;
}
public StepPattern getKernelPattern() {
return _right.getKernelPattern();
}
public void reduceKernelPattern() {
_right.reduceKernelPattern();
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
_left.typeCheck(stable);
return _right.typeCheck(stable);
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final LocalVariableGen local =
methodGen.addLocalVariable2("ppt",
Util.getJCRefType(NODE_SIG),
il.getEnd());
final com.sun.org.apache.bcel.internal.generic.Instruction loadLocal =
new ILOAD(local.getIndex());
final com.sun.org.apache.bcel.internal.generic.Instruction storeLocal =
new ISTORE(local.getIndex());
if (_right.isWildcard()) {
il.append(methodGen.loadDOM());
il.append(SWAP);
}
else if (_right instanceof StepPattern) {
il.append(DUP);
il.append(storeLocal);
_right.translate(classGen, methodGen);
il.append(methodGen.loadDOM());
local.setEnd(il.append(loadLocal));
}
else {
_right.translate(classGen, methodGen);
if (_right instanceof AncestorPattern) {
il.append(methodGen.loadDOM());
il.append(SWAP);
}
}
final int getParent = cpg.addInterfaceMethodref(DOM_INTF,
GET_PARENT,
GET_PARENT_SIG);
il.append(new INVOKEINTERFACE(getParent, 2));
final SyntaxTreeNode p = getParent();
if (p == null || p instanceof Instruction ||
p instanceof TopLevelElement)
{
_left.translate(classGen, methodGen);
}
else {
il.append(DUP);
il.append(storeLocal);
_left.translate(classGen, methodGen);
il.append(methodGen.loadDOM());
local.setEnd(il.append(loadLocal));
}
methodGen.removeLocalVariable(local);
/*
* If _right is an ancestor pattern, backpatch _left false
* list to the loop that searches for more ancestors.
*/
if (_right instanceof AncestorPattern) {
final AncestorPattern ancestor = (AncestorPattern) _right;
_left.backPatchFalseList(ancestor.getLoopHandle()); // clears list
}
_trueList.append(_right._trueList.append(_left._trueList));
_falseList.append(_right._falseList.append(_left._falseList));
}
public String toString() {
return "Parent(" + _left + ", " + _right + ')';
}
}