| /* |
| * @(#)$Id$ |
| * |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 2001 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 |
| * |
| */ |
| |
| package org.apache.xalan.xsltc.compiler; |
| |
| import java.util.Vector; |
| import java.util.Enumeration; |
| import org.apache.xalan.xsltc.compiler.util.Type; |
| import org.apache.bcel.generic.Instruction; |
| import org.apache.bcel.generic.*; |
| import org.apache.xalan.xsltc.compiler.util.*; |
| |
| final class AttributeValueTemplate extends AttributeValue { |
| |
| public AttributeValueTemplate(String value, Parser parser, |
| SyntaxTreeNode parent) |
| { |
| setParent(parent); |
| setParser(parser); |
| if (check(value, parser)) { |
| parseAVTemplate(0, value, parser); |
| } |
| } |
| |
| private void parseAVTemplate(final int start, String text, Parser parser) { |
| String str; |
| |
| if (text == null) return; |
| |
| // Get first single opening braces |
| int open = start - 2; |
| do { |
| open = text.indexOf('{', open+2); |
| } while ((open != -1) && |
| (open < (text.length()-1)) && |
| (text.charAt(open+1) == '{')); |
| |
| if (open != -1) { |
| // Get first single closing braces |
| int close = open - 2; |
| do { |
| close = text.indexOf('}', close+2); |
| } while ((close != -1) && |
| (close < (text.length()-1)) && |
| (text.charAt(close+1) == '}')); |
| |
| // Add literal expressiong before AVT |
| if (open > start) { |
| str = removeDuplicateBraces(text.substring(start, open)); |
| addElement(new LiteralExpr(str)); |
| } |
| // Add the AVT itself |
| if (close > open + 1) { |
| str = text.substring(open + 1, close); |
| str = removeDuplicateBraces(text.substring(open+1,close)); |
| addElement(parser.parseExpression(this, str)); |
| } |
| // Parse rest of string |
| parseAVTemplate(close + 1, text, parser); |
| |
| } |
| else if (start < text.length()) { |
| // Add literal expression following AVT |
| str = removeDuplicateBraces(text.substring(start)); |
| addElement(new LiteralExpr(str)); |
| } |
| } |
| |
| public String removeDuplicateBraces(String orig) { |
| String result = orig; |
| int index; |
| |
| while ((index = result.indexOf("{{")) != -1) { |
| result = result.substring(0,index) + |
| result.substring(index+1,result.length()); |
| } |
| |
| while ((index = result.indexOf("}}")) != -1) { |
| result = result.substring(0,index) + |
| result.substring(index+1,result.length()); |
| } |
| |
| return(result); |
| } |
| |
| public Type typeCheck(SymbolTable stable) throws TypeCheckError { |
| final Vector contents = getContents(); |
| final int n = contents.size(); |
| for (int i = 0; i < n; i++) { |
| final Expression exp = (Expression)contents.elementAt(i); |
| if (!exp.typeCheck(stable).identicalTo(Type.String)) { |
| contents.setElementAt(new CastExpr(exp, Type.String), i); |
| } |
| } |
| return _type = Type.String; |
| } |
| |
| public String toString() { |
| final StringBuffer buffer = new StringBuffer("AVT:["); |
| final int count = elementCount(); |
| for (int i = 0; i < count; i++) { |
| buffer.append(elementAt(i).toString()); |
| if (i < count - 1) |
| buffer.append(' '); |
| } |
| return buffer.append(']').toString(); |
| } |
| |
| public void translate(ClassGenerator classGen, MethodGenerator methodGen) { |
| if (elementCount() == 1) { |
| final Expression exp = (Expression)elementAt(0); |
| exp.translate(classGen, methodGen); |
| } |
| else { |
| final ConstantPoolGen cpg = classGen.getConstantPool(); |
| final InstructionList il = methodGen.getInstructionList(); |
| final int initBuffer = cpg.addMethodref(STRING_BUFFER_CLASS, |
| "<init>", "()V"); |
| final Instruction append = |
| new INVOKEVIRTUAL(cpg.addMethodref(STRING_BUFFER_CLASS, |
| "append", |
| "(" + STRING_SIG + ")" |
| + STRING_BUFFER_SIG)); |
| |
| final int toString = cpg.addMethodref(STRING_BUFFER_CLASS, |
| "toString", |
| "()"+STRING_SIG); |
| il.append(new NEW(cpg.addClass(STRING_BUFFER_CLASS))); |
| il.append(DUP); |
| il.append(new INVOKESPECIAL(initBuffer)); |
| // StringBuffer is on the stack |
| final Enumeration enum = elements(); |
| while (enum.hasMoreElements()) { |
| final Expression exp = (Expression)enum.nextElement(); |
| exp.translate(classGen, methodGen); |
| il.append(append); |
| } |
| il.append(new INVOKEVIRTUAL(toString)); |
| } |
| } |
| |
| private boolean check(String value, Parser parser) { |
| // !!! how about quoted/escaped braces? |
| if (value == null) return true; |
| |
| final char[] chars = value.toCharArray(); |
| int level = 0; |
| for (int i = 0; i < chars.length; i++) { |
| switch (chars[i]) { |
| case '{': |
| if (((i+1) == (chars.length)) || (chars[i+1] != '{')) |
| ++level; |
| else |
| i++; |
| break; |
| case '}': |
| if (((i+1) == (chars.length)) || (chars[i+1] != '}')) |
| --level; |
| else |
| i++; |
| break; |
| default: |
| continue; |
| } |
| switch (level) { |
| case 0: |
| case 1: |
| continue; |
| default: |
| reportError(getParent(), parser, |
| ErrorMsg.ATTR_VAL_TEMPLATE_ERR, value); |
| return false; |
| } |
| } |
| if (level != 0) { |
| reportError(getParent(), parser, |
| ErrorMsg.ATTR_VAL_TEMPLATE_ERR, value); |
| return false; |
| } |
| return true; |
| } |
| } |