/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.
*/
package org.apache.cocoon.template.expression;
import java.io.Reader;
import java.util.LinkedList;
import java.util.List;
/**
* @version $Id$
*/
public class JXTGStringTemplateParser extends AbstractStringTemplateParser {
public final static String JXPATH = "jxpath";
public final static String JEXL = "jexl";
public final static String JAVASCRIPT = "js";
/**
* @see org.apache.cocoon.template.expression.StringTemplateParser#parseSubstitutions(java.io.Reader)
*/
public List parseSubstitutions(Reader in) throws Exception {
LinkedList substitutions = new LinkedList();
StringBuffer buf = new StringBuffer();
buf.setLength(0);
int ch;
boolean inExpr = false;
String lang = null;
top: while ((ch = in.read()) != -1) {
// column++;
char c = (char) ch;
processChar: while (true) {
if (inExpr) {
if (c == '\\') {
ch = in.read();
buf.append(ch == -1 ? '\\' : (char) ch);
} else if (c == '}') {
String str = buf.toString();
substitutions.add(compile(str, lang));
buf.setLength(0);
inExpr = false;
} else {
buf.append(c);
}
} else if (c == '$' || c == '#' || c == '@') {
ch = in.read();
if (ch == '{') {
lang = (c == '#') ? JXPATH : ((c == '$') ? JEXL : JAVASCRIPT);
inExpr = true;
if (buf.length() > 0) {
substitutions.add(new Literal(buf.toString()));
buf.setLength(0);
}
continue top;
}
buf.append(c);
if (ch != -1) {
c = (char) ch;
continue processChar;
}
} else {
buf.append(c);
}
break;
}
}
if (inExpr)
throw new Exception("Unterminated {");
if (buf.length() > 0)
substitutions.add(new Literal(buf.toString()));
return substitutions;
}
}