/*
* @(#)$Id$
*
* 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 de.fub.bytecode.generic.Instruction;
import de.fub.bytecode.generic.*;
import org.apache.xalan.xsltc.compiler.util.*;
final class AttributeValueTemplate extends AttributeValue {
public AttributeValueTemplate(String value, Parser parser) {
check(value);
parseAVTemplate(0, value, parser);
setParser(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 void check(String value) {
// !!! how about quoted/escaped braces?
if (value == null) return;
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:
throw new Error("bad AttributeValueTemplate: " + value);
}
}
if (level != 0)
throw new Error("bad AttributeValueTemplate: " + value);
}
}