/*
* 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: Text.java,v 1.17 2004/02/16 22:25:10 minchau 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.GETSTATIC;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.PUSH;
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.Util;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Morten Jorgensen
*/
final class Text extends Instruction {
private String _text;
private boolean _escaping = true;
private boolean _ignore = false;
private boolean _textElement = false;
/**
* Create a blank Text syntax tree node.
*/
public Text() {
_textElement = true;
}
/**
* Create text syntax tree node.
* @param text is the text to put in the node.
*/
public Text(String text) {
_text = text;
}
/**
* Returns the text wrapped inside this node
* @return The text wrapped inside this node
*/
protected String getText() {
return _text;
}
/**
* Set the text for this node. Appends the given text to any already
* existing text (using string concatenation, so use only when needed).
* @param text is the text to wrap inside this node.
*/
protected void setText(String text) {
if (_text == null)
_text = text;
else
_text = _text + text;
}
public void display(int indent) {
indent(indent);
Util.println("Text");
indent(indent + IndentIncrement);
Util.println(_text);
}
public void parseContents(Parser parser) {
final String str = getAttribute("disable-output-escaping");
if ((str != null) && (str.equals("yes"))) _escaping = false;
parseChildren(parser);
if (_text == null) {
if (_textElement) {
_text = EMPTYSTRING;
}
else {
_ignore = true;
}
}
else if (_textElement) {
if (_text.length() == 0) _ignore = true;
}
else if (getParent() instanceof LiteralElement) {
LiteralElement element = (LiteralElement)getParent();
String space = element.getAttribute("xml:space");
if ((space == null) || (!space.equals("preserve")))
if (_text.trim().length() == 0) _ignore = true;
}
else {
if (_text.trim().length() == 0) _ignore = true;
}
}
public void ignore() {
_ignore = true;
}
public boolean isIgnore() {
return _ignore;
}
public boolean isTextElement() {
return _textElement;
}
protected boolean contextDependent() {
return false;
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
if (!_ignore) {
// Turn off character escaping if so is wanted.
final int esc = cpg.addInterfaceMethodref(OUTPUT_HANDLER,
"setEscaping", "(Z)Z");
if (!_escaping) {
il.append(methodGen.loadHandler());
il.append(new PUSH(cpg, false));
il.append(new INVOKEINTERFACE(esc, 2));
}
il.append(methodGen.loadHandler());
// Call characters(String) or characters(char[],int,int), as
// appropriate.
if (!canLoadAsArrayOffsetLength()) {
final int characters = cpg.addInterfaceMethodref(OUTPUT_HANDLER,
"characters",
"("+STRING_SIG+")V");
il.append(new PUSH(cpg, _text));
il.append(new INVOKEINTERFACE(characters, 2));
} else {
final int characters = cpg.addInterfaceMethodref(OUTPUT_HANDLER,
"characters",
"([CII)V");
loadAsArrayOffsetLength(classGen, methodGen);
il.append(new INVOKEINTERFACE(characters, 4));
}
// Restore character escaping setting to whatever it was.
// Note: setEscaping(bool) returns the original (old) value
if (!_escaping) {
il.append(methodGen.loadHandler());
il.append(SWAP);
il.append(new INVOKEINTERFACE(esc, 2));
il.append(POP);
}
}
translateContents(classGen, methodGen);
}
/**
* Check whether this Text node can be stored in a char[] in the translet.
* Calling this is precondition to calling loadAsArrayOffsetLength.
* @see #loadAsArrayOffsetLength(ClassGenerator,MethodGenerator)
* @return true if this Text node can be
*/
public boolean canLoadAsArrayOffsetLength() {
// Magic number! 21845*3 == 65535. BCEL uses a DataOutputStream to
// serialize class files. The Java run-time places a limit on the size
// of String data written using a DataOutputStream - it cannot require
// more than 64KB when represented as UTF-8. The number of bytes
// required to represent a Java string as UTF-8 cannot be greater
// than three times the number of char's in the string, hence the
// check for 21845.
return (_text.length() <= 21845);
}
/**
* Generates code that loads the array that will contain the character
* data represented by this Text node, followed by the offset of the
* data from the start of the array, and then the length of the data.
*
* The pre-condition to calling this method is that
* canLoadAsArrayOffsetLength() returns true.
* @see #canLoadArrayOffsetLength()
*/
public void loadAsArrayOffsetLength(ClassGenerator classGen,
MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
final XSLTC xsltc = classGen.getParser().getXSLTC();
// The XSLTC object keeps track of character data
// that is to be stored in char arrays.
final int offset = xsltc.addCharacterData(_text);
final int length = _text.length();
String charDataFieldName =
STATIC_CHAR_DATA_FIELD + (xsltc.getCharacterDataCount()-1);
il.append(new GETSTATIC(cpg.addFieldref(xsltc.getClassName(),
charDataFieldName,
STATIC_CHAR_DATA_FIELD_SIG)));
il.append(new PUSH(cpg, offset));
il.append(new PUSH(cpg, _text.length()));
}
}
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