ohair | 6c32066 | 2012-03-04 11:55:34 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * reserved comment block |
| 3 | * DO NOT REMOVE OR ALTER! |
| 4 | */ |
| 5 | /* |
| 6 | * Copyright 2001-2004 The Apache Software Foundation. |
| 7 | * |
| 8 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 9 | * you may not use this file except in compliance with the License. |
| 10 | * You may obtain a copy of the License at |
| 11 | * |
| 12 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 13 | * |
| 14 | * Unless required by applicable law or agreed to in writing, software |
| 15 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 16 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 17 | * See the License for the specific language governing permissions and |
| 18 | * limitations under the License. |
| 19 | */ |
| 20 | /* |
| 21 | * $Id: ParentPattern.java,v 1.2.4.1 2005/09/02 11:10:09 pvedula Exp $ |
| 22 | */ |
| 23 | |
| 24 | package com.sun.org.apache.xalan.internal.xsltc.compiler; |
| 25 | |
| 26 | import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen; |
| 27 | import com.sun.org.apache.bcel.internal.generic.ILOAD; |
| 28 | import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE; |
| 29 | import com.sun.org.apache.bcel.internal.generic.ISTORE; |
| 30 | import com.sun.org.apache.bcel.internal.generic.InstructionList; |
| 31 | import com.sun.org.apache.bcel.internal.generic.LocalVariableGen; |
| 32 | import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator; |
| 33 | import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator; |
| 34 | import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type; |
| 35 | import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError; |
| 36 | import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util; |
| 37 | |
| 38 | /** |
| 39 | * @author Jacek Ambroziak |
| 40 | * @author Santiago Pericas-Geertsen |
| 41 | */ |
| 42 | final class ParentPattern extends RelativePathPattern { |
| 43 | private final Pattern _left; |
| 44 | private final RelativePathPattern _right; |
| 45 | |
| 46 | public ParentPattern(Pattern left, RelativePathPattern right) { |
| 47 | (_left = left).setParent(this); |
| 48 | (_right = right).setParent(this); |
| 49 | } |
| 50 | |
| 51 | public void setParser(Parser parser) { |
| 52 | super.setParser(parser); |
| 53 | _left.setParser(parser); |
| 54 | _right.setParser(parser); |
| 55 | } |
| 56 | |
| 57 | public boolean isWildcard() { |
| 58 | return false; |
| 59 | } |
| 60 | |
| 61 | public StepPattern getKernelPattern() { |
| 62 | return _right.getKernelPattern(); |
| 63 | } |
| 64 | |
| 65 | public void reduceKernelPattern() { |
| 66 | _right.reduceKernelPattern(); |
| 67 | } |
| 68 | |
| 69 | public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| 70 | _left.typeCheck(stable); |
| 71 | return _right.typeCheck(stable); |
| 72 | } |
| 73 | |
| 74 | public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| 75 | final ConstantPoolGen cpg = classGen.getConstantPool(); |
| 76 | final InstructionList il = methodGen.getInstructionList(); |
| 77 | final LocalVariableGen local = |
| 78 | methodGen.addLocalVariable2("ppt", |
| 79 | Util.getJCRefType(NODE_SIG), |
| 80 | il.getEnd()); |
| 81 | |
| 82 | final com.sun.org.apache.bcel.internal.generic.Instruction loadLocal = |
| 83 | new ILOAD(local.getIndex()); |
| 84 | final com.sun.org.apache.bcel.internal.generic.Instruction storeLocal = |
| 85 | new ISTORE(local.getIndex()); |
| 86 | |
| 87 | if (_right.isWildcard()) { |
| 88 | il.append(methodGen.loadDOM()); |
| 89 | il.append(SWAP); |
| 90 | } |
| 91 | else if (_right instanceof StepPattern) { |
| 92 | il.append(DUP); |
| 93 | il.append(storeLocal); |
| 94 | |
| 95 | _right.translate(classGen, methodGen); |
| 96 | |
| 97 | il.append(methodGen.loadDOM()); |
| 98 | local.setEnd(il.append(loadLocal)); |
| 99 | } |
| 100 | else { |
| 101 | _right.translate(classGen, methodGen); |
| 102 | |
| 103 | if (_right instanceof AncestorPattern) { |
| 104 | il.append(methodGen.loadDOM()); |
| 105 | il.append(SWAP); |
| 106 | } |
| 107 | } |
| 108 | |
| 109 | final int getParent = cpg.addInterfaceMethodref(DOM_INTF, |
| 110 | GET_PARENT, |
| 111 | GET_PARENT_SIG); |
| 112 | il.append(new INVOKEINTERFACE(getParent, 2)); |
| 113 | |
| 114 | final SyntaxTreeNode p = getParent(); |
| 115 | if (p == null || p instanceof Instruction || |
| 116 | p instanceof TopLevelElement) |
| 117 | { |
| 118 | _left.translate(classGen, methodGen); |
| 119 | } |
| 120 | else { |
| 121 | il.append(DUP); |
| 122 | il.append(storeLocal); |
| 123 | |
| 124 | _left.translate(classGen, methodGen); |
| 125 | |
| 126 | il.append(methodGen.loadDOM()); |
| 127 | local.setEnd(il.append(loadLocal)); |
| 128 | } |
| 129 | |
| 130 | methodGen.removeLocalVariable(local); |
| 131 | |
| 132 | /* |
| 133 | * If _right is an ancestor pattern, backpatch _left false |
| 134 | * list to the loop that searches for more ancestors. |
| 135 | */ |
| 136 | if (_right instanceof AncestorPattern) { |
| 137 | final AncestorPattern ancestor = (AncestorPattern) _right; |
| 138 | _left.backPatchFalseList(ancestor.getLoopHandle()); // clears list |
| 139 | } |
| 140 | |
| 141 | _trueList.append(_right._trueList.append(_left._trueList)); |
| 142 | _falseList.append(_right._falseList.append(_left._falseList)); |
| 143 | } |
| 144 | |
| 145 | public String toString() { |
| 146 | return "Parent(" + _left + ", " + _right + ')'; |
| 147 | } |
| 148 | } |