/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: LiteralAttribute.java,v 1.9 2004/05/21 20:29:28 santiagopg Exp $
*/
package org.apache.xalan.xsltc.compiler;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.PUSH;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
import org.apache.xalan.xsltc.compiler.util.Util;
import org.apache.xml.serializer.ElemDesc;
import org.apache.xml.serializer.SerializationHandler;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*/
final class LiteralAttribute extends Instruction {
private final String _name; // Attribute name (incl. prefix)
private final AttributeValue _value; // Attribute value
/**
* Creates a new literal attribute (but does not insert it into the AST).
* @param name the attribute name (incl. prefix) as a String.
* @param value the attribute value.
* @param parser the XSLT parser (wraps XPath parser).
*/
public LiteralAttribute(String name, String value, Parser parser,
SyntaxTreeNode parent)
{
_name = name;
setParent(parent);
_value = AttributeValue.create(this, value, parser);
}
public void display(int indent) {
indent(indent);
Util.println("LiteralAttribute name=" + _name + " value=" + _value);
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
_value.typeCheck(stable);
typeCheckContents(stable);
return Type.Void;
}
protected boolean contextDependent() {
return _value.contextDependent();
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// push handler
il.append(methodGen.loadHandler());
// push attribute name - namespace prefix set by parent node
il.append(new PUSH(cpg, _name));
// push attribute value
_value.translate(classGen, methodGen);
// Generate code that calls SerializationHandler.addUniqueAttribute()
// if all attributes are unique.
SyntaxTreeNode parent = getParent();
if (parent instanceof LiteralElement
&& ((LiteralElement)parent).allAttributesUnique()) {
int flags = 0;
boolean isHTMLAttrEmpty = false;
ElemDesc elemDesc = ((LiteralElement)parent).getElemDesc();
// Set the HTML flags
if (elemDesc != null) {
if (elemDesc.isAttrFlagSet(_name, ElemDesc.ATTREMPTY)) {
flags = flags | SerializationHandler.HTML_ATTREMPTY;
isHTMLAttrEmpty = true;
}
else if (elemDesc.isAttrFlagSet(_name, ElemDesc.ATTRURL)) {
flags = flags | SerializationHandler.HTML_ATTRURL;
}
}
if (_value instanceof SimpleAttributeValue) {
String attrValue = ((SimpleAttributeValue)_value).toString();
if (!hasBadChars(attrValue) && !isHTMLAttrEmpty) {
flags = flags | SerializationHandler.NO_BAD_CHARS;
}
}
il.append(new PUSH(cpg, flags));
il.append(methodGen.uniqueAttribute());
}
else {
// call attribute
il.append(methodGen.attribute());
}
}
/**
* Return true if at least one character in the String is considered to
* be a "bad" character. A bad character is one whose code is:
* less than 32 (a space),
* or greater than 126,
* or it is one of '<', '>', '&' or '\"'.
* This helps the serializer to decide whether the String needs to be escaped.
*/
private boolean hasBadChars(String value) {
char[] chars = value.toCharArray();
int size = chars.length;
for (int i = 0; i < size; i++) {
char ch = chars[i];
if (ch < 32 || 126 < ch || ch == '<' || ch == '>' || ch == '&' || ch == '\"')
return true;
}
return false;
}
/**
* Return the name of the attribute
*/
public String getName() {
return _name;
}
/**
* Return the value of the attribute
*/
public AttributeValue getValue() {
return _value;
}
}