| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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 1.2.4.1 2005/09/12 11:33:09 pvedula 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"))) |
| { |
| int i; |
| final int textLength = _text.length(); |
| for (i = 0; i < textLength; i++) { |
| char c = _text.charAt(i); |
| if (!isWhitespace(c)) |
| break; |
| } |
| if (i == textLength) |
| _ignore = true; |
| } |
| } |
| else { |
| int i; |
| final int textLength = _text.length(); |
| for (i = 0; i < textLength; i++) |
| { |
| char c = _text.charAt(i); |
| if (!isWhitespace(c)) |
| break; |
| } |
| if (i == textLength) |
| _ignore = true; |
| } |
| } |
| |
| public void ignore() { |
| _ignore = true; |
| } |
| |
| public boolean isIgnore() { |
| return _ignore; |
| } |
| |
| public boolean isTextElement() { |
| return _textElement; |
| } |
| |
| protected boolean contextDependent() { |
| return false; |
| } |
| |
| private static boolean isWhitespace(char c) |
| { |
| return (c == 0x20 || c == 0x09 || c == 0x0A || c == 0x0D); |
| } |
| |
| 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())); |
| } |
| } |