001/*
002 * Copyright (C) 2009-2011 Mathias Doenitz
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.parboiled.matchers;
018
019import org.parboiled.MatcherContext;
020import org.parboiled.matchervisitors.MatcherVisitor;
021
022import static org.parboiled.common.Preconditions.checkArgNotNull;
023import static org.parboiled.common.StringUtils.escape;
024
025/**
026 * A {@link Matcher} matching a single character case-independently.
027 */
028public class CharIgnoreCaseMatcher extends AbstractMatcher {
029    public final char charLow;
030    public final char charUp;
031
032    public CharIgnoreCaseMatcher(char character) {
033        super('\'' + escape(Character.toLowerCase(character)) + '/' + escape(Character.toUpperCase(character)) + '\'');
034        this.charLow = Character.toLowerCase(character);
035        this.charUp = Character.toUpperCase(character);
036    }
037
038    public boolean match(MatcherContext context) {
039        char c = context.getCurrentChar();
040        if (c != charLow && c != charUp) return false;
041        context.advanceIndex(1);
042        context.createNode();
043        return true;
044    }
045
046    public <R> R accept(MatcherVisitor<R> visitor) {
047        checkArgNotNull(visitor, "visitor");
048        return visitor.visit(this);
049    }
050
051}