| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001-2003 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, |
| * if any, must include the following acknowledgment: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowledgment may appear in the software itself, |
| * if and wherever such third-party acknowledgments normally appear. |
| * |
| * 4. The names "Xalan" and "Apache Software Foundation" must |
| * not be used to endorse or promote products derived from this |
| * software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache", |
| * nor may "Apache" appear in their name, without prior written |
| * permission of the Apache Software Foundation. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 2001, Sun |
| * Microsystems., http://www.sun.com. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| * @author Jacek Ambroziak |
| * @author Santiago Pericas-Geertsen |
| * @author Morten Jorgensen |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import org.apache.bcel.generic.ConstantPoolGen; |
| import org.apache.bcel.generic.GETSTATIC; |
| import org.apache.bcel.generic.INVOKEINTERFACE; |
| 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.Util; |
| |
| 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())); |
| } |
| } |
