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/*
*
* Copyright 2002-2004 The Ant-Contrib project
*
* Licensed 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 net.sf.antcontrib.cpptasks.parser;
/**
* This parser state checks consumed characters against a specific character.
*
* @author Curt Arnold
*/
public final class LetterState
extends AbstractParserState {
/**
* Next state if a match is found.
*/
private final AbstractParserState nextState;
/**
* Next state if not match is found.
*/
private final AbstractParserState noMatchState;
/**
* Character to match.
*/
private final char thisLetter;
/**
* Constructor.
*
* @param parser
* parser
* @param matchLetter
* letter to match
* @param nextStateArg
* next state if a match on the letter
* @param noMatchStateArg
* state if no match on letter
*/
public LetterState(final AbstractParser parser,
final char matchLetter,
final AbstractParserState nextStateArg,
final AbstractParserState noMatchStateArg) {
super(parser);
this.thisLetter = matchLetter;
this.nextState = nextStateArg;
this.noMatchState = noMatchStateArg;
}
/**
* Consumes a character and returns the next state for the parser.
*
* @param ch
* next character
* @return the configured nextState if ch is the expected character or the
* configure noMatchState otherwise.
*/
public AbstractParserState consume(final char ch) {
if (ch == thisLetter) {
return nextState;
}
if (ch == '\n') {
getParser().getNewLineState();
}
return noMatchState;
}
}
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