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: ValueOf.java,v 1.2.4.1 2005/09/05 09:30:04 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.INVOKEINTERFACE;
28 import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
29 import com.sun.org.apache.bcel.internal.generic.InstructionList;
30 import com.sun.org.apache.bcel.internal.generic.PUSH;
31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
32 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
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 * @author Morten Jorgensen
42 */
43 final class ValueOf extends Instruction {
44 private Expression _select;
45 private boolean _escaping = true;
46 private boolean _isString = false;
47
48 public void display(int indent) {
49 indent(indent);
50 Util.println("ValueOf");
51 indent(indent + IndentIncrement);
52 Util.println("select " + _select.toString());
53 }
54
55 public void parseContents(Parser parser) {
56 _select = parser.parseExpression(this, "select", null);
57
58 // make sure required attribute(s) have been set
59 if (_select.isDummy()) {
60 reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "select");
61 return;
62 }
63 final String str = getAttribute("disable-output-escaping");
64 if ((str != null) && (str.equals("yes"))) _escaping = false;
65 }
66
67 public Type typeCheck(SymbolTable stable) throws TypeCheckError {
68 Type type = _select.typeCheck(stable);
69
70 // Prefer to handle the value as a node; fall back to String, otherwise
71 if (type != null && !type.identicalTo(Type.Node)) {
72 /***
73 *** %HZ% Would like to treat result-tree fragments in the same
74 *** %HZ% way as node sets for value-of, but that's running into
75 *** %HZ% some snags. Instead, they'll be converted to String
76 if (type.identicalTo(Type.ResultTree)) {
77 _select = new CastExpr(new CastExpr(_select, Type.NodeSet),
78 Type.Node);
79 } else
80 ***/
81 if (type.identicalTo(Type.NodeSet)) {
82 _select = new CastExpr(_select, Type.Node);
83 } else {
84 _isString = true;
85 if (!type.identicalTo(Type.String)) {
86 _select = new CastExpr(_select, Type.String);
87 }
88 _isString = true;
89 }
90 }
91 return Type.Void;
92 }
93
94 public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
95 final ConstantPoolGen cpg = classGen.getConstantPool();
96 final InstructionList il = methodGen.getInstructionList();
97 final int setEscaping = cpg.addInterfaceMethodref(OUTPUT_HANDLER,
98 "setEscaping","(Z)Z");
99
100 // Turn off character escaping if so is wanted.
101 if (!_escaping) {
102 il.append(methodGen.loadHandler());
103 il.append(new PUSH(cpg,false));
104 il.append(new INVOKEINTERFACE(setEscaping,2));
105 }
106
107 // Translate the contents. If the value is a string, use the
108 // translet.characters(String, TranslatOutputHandler) method.
109 // Otherwise, the value is a node, and the
110 // dom.characters(int node, TransletOutputHandler) method can dispatch
111 // the string value of the node to the output handler more efficiently.
112 if (_isString) {
113 final int characters = cpg.addMethodref(TRANSLET_CLASS,
114 CHARACTERSW,
115 CHARACTERSW_SIG);
116
117 il.append(classGen.loadTranslet());
118 _select.translate(classGen, methodGen);
119 il.append(methodGen.loadHandler());
120 il.append(new INVOKEVIRTUAL(characters));
121 } else {
122 final int characters = cpg.addInterfaceMethodref(DOM_INTF,
123 CHARACTERS,
124 CHARACTERS_SIG);
125
126 il.append(methodGen.loadDOM());
127 _select.translate(classGen, methodGen);
128 il.append(methodGen.loadHandler());
129 il.append(new INVOKEINTERFACE(characters, 3));
130 }
131
132 // Restore character escaping setting to whatever it was.
133 if (!_escaping) {
134 il.append(methodGen.loadHandler());
135 il.append(SWAP);
136 il.append(new INVOKEINTERFACE(setEscaping,2));
137 il.append(POP);
138 }
139 }
140 }