1 /*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5 /*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements. See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License. You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22 package com.sun.org.apache.xalan.internal.xsltc.compiler;
23
24 import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
25 import com.sun.org.apache.bcel.internal.generic.InstructionList;
26 import com.sun.org.apache.bcel.internal.generic.PUSH;
27 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
28 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
29 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
30 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
31 import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
32
33 import com.sun.org.apache.xml.internal.serializer.ElemDesc;
34 import com.sun.org.apache.xml.internal.serializer.SerializationHandler;
35
36 /**
37 * @author Jacek Ambroziak
38 * @author Santiago Pericas-Geertsen
39 * @author Morten Jorgensen
40 */
41 final class LiteralAttribute extends Instruction {
42
43 private final String _name; // Attribute name (incl. prefix)
44 private final AttributeValue _value; // Attribute value
45
46 /**
47 * Creates a new literal attribute (but does not insert it into the AST).
48 * @param name the attribute name (incl. prefix) as a String.
49 * @param value the attribute value.
50 * @param parser the XSLT parser (wraps XPath parser).
51 */
52 public LiteralAttribute(String name, String value, Parser parser,
53 SyntaxTreeNode parent)
54 {
55 _name = name;
56 setParent(parent);
57 _value = AttributeValue.create(this, value, parser);
58 }
59
60 public void display(int indent) {
61 indent(indent);
62 Util.println("LiteralAttribute name=" + _name + " value=" + _value);
63 }
64
65 public Type typeCheck(SymbolTable stable) throws TypeCheckError {
66 _value.typeCheck(stable);
67 typeCheckContents(stable);
68 return Type.Void;
69 }
70
71 protected boolean contextDependent() {
72 return _value.contextDependent();
73 }
74
75 public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
76 final ConstantPoolGen cpg = classGen.getConstantPool();
77 final InstructionList il = methodGen.getInstructionList();
78
79 // push handler
80 il.append(methodGen.loadHandler());
81 // push attribute name - namespace prefix set by parent node
82 il.append(new PUSH(cpg, _name));
83 // push attribute value
84 _value.translate(classGen, methodGen);
85
86 // Generate code that calls SerializationHandler.addUniqueAttribute()
87 // if all attributes are unique.
88 SyntaxTreeNode parent = getParent();
89 if (parent instanceof LiteralElement
90 && ((LiteralElement)parent).allAttributesUnique()) {
91
92 int flags = 0;
93 boolean isHTMLAttrEmpty = false;
94 ElemDesc elemDesc = ((LiteralElement)parent).getElemDesc();
95
96 // Set the HTML flags
97 if (elemDesc != null) {
98 if (elemDesc.isAttrFlagSet(_name, ElemDesc.ATTREMPTY)) {
99 flags = flags | SerializationHandler.HTML_ATTREMPTY;
100 isHTMLAttrEmpty = true;
101 }
102 else if (elemDesc.isAttrFlagSet(_name, ElemDesc.ATTRURL)) {
103 flags = flags | SerializationHandler.HTML_ATTRURL;
104 }
105 }
106
107 if (_value instanceof SimpleAttributeValue) {
108 String attrValue = ((SimpleAttributeValue)_value).toString();
109
110 if (!hasBadChars(attrValue) && !isHTMLAttrEmpty) {
111 flags = flags | SerializationHandler.NO_BAD_CHARS;
112 }
113 }
114
115 il.append(new PUSH(cpg, flags));
116 il.append(methodGen.uniqueAttribute());
117 }
118 else {
119 // call attribute
120 il.append(methodGen.attribute());
121 }
122 }
123
124 /**
125 * Return true if at least one character in the String is considered to
126 * be a "bad" character. A bad character is one whose code is:
127 * less than 32 (a space),
128 * or greater than 126,
129 * or it is one of '<', '>', '&' or '\"'.
130 * This helps the serializer to decide whether the String needs to be escaped.
131 */
132 private boolean hasBadChars(String value) {
133 char[] chars = value.toCharArray();
134 int size = chars.length;
135 for (int i = 0; i < size; i++) {
136 char ch = chars[i];
137 if (ch < 32 || 126 < ch || ch == '<' || ch == '>' || ch == '&' || ch == '\"')
138 return true;
139 }
140 return false;
141 }
142
143 /**
144 * Return the name of the attribute
145 */
146 public String getName() {
147 return _name;
148 }
149
150 /**
151 * Return the value of the attribute
152 */
153 public AttributeValue getValue() {
154 return _value;
155 }
156
157 }