/*
* Copyright (C) 2013 The Rythm Engine project
* Gelin Luo <greenlaw110(at)gmail.com>
*
* 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.rythmengine.internal.parser.build_in;
import org.rythmengine.extension.ICodeType;
import org.rythmengine.internal.IContext;
import org.rythmengine.internal.Token;
import org.rythmengine.internal.parser.RemoveLeadingLineBreakAndSpacesParser;
import org.rythmengine.utils.S;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Detect if a directive comment is reached and strip
* it out from the parsing process
* <p/>
* <p>For example when <!-- @> is found the
* <!-- should be stripped out</p>
*/
public class DirectiveCommentStartSensor extends RemoveLeadingLineBreakAndSpacesParser {
public DirectiveCommentStartSensor(IContext context) {
super(context);
}
private static Map<String, Pattern> patterns = new HashMap<String, Pattern>();
@Override
public Token go() {
IContext ctx = ctx();
if (ctx.insideDirectiveComment()) {
return null;
//raiseParseException("directive comment not closed");
}
ICodeType type = ctx.peekCodeType();
while (null != type) {
String sCommentStart = type.commentStart();
if (!S.empty(sCommentStart)) {
sCommentStart = S.escapeRegex(sCommentStart).toString();
// try <!-- @ first
String s = "(" + sCommentStart + "\\s*" + ")" + ctx.getDialect().a() + ".*";
Pattern p = patterns.get(s);
if (null == p) {
p = Pattern.compile(s, Pattern.DOTALL);
patterns.put(s, p);
}
Matcher m = p.matcher(remain());
if (m.matches()) {
s = m.group(1);
ctx.step(s.length());
ctx.enterDirectiveComment();
return Token.EMPTY_TOKEN;
}
// try <!-- }
s = "(" + sCommentStart + "\\s*)\\}.*";
p = patterns.get(s);
if (null == p) {
p = Pattern.compile(s, Pattern.DOTALL);
patterns.put(s, p);
}
m = p.matcher(remain());
if (m.matches()) {
s = m.group(1);
ctx.step(s.length());
ctx.enterDirectiveComment();
return Token.EMPTY_TOKEN;
}
}
type = type.getParent();
}
return null;
}
public static void main(String[] args) {
}
}