/* | |
* | |
* 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 | |
* (case insensitive) or whitespace. | |
* | |
* @author Curt Arnold | |
*/ | |
public final class WhitespaceOrCaseInsensitiveLetterState | |
extends | |
AbstractParserState { | |
/** | |
* Next state if the character is found. | |
*/ | |
private final AbstractParserState nextState; | |
/** | |
* Character to match (lower case). | |
*/ | |
private final char lowerLetter; | |
/** | |
* Character to match (upper case). | |
*/ | |
private final char upperLetter; | |
/** | |
* Constructor. | |
* | |
* @param parser | |
* parser | |
* @param matchLetter | |
* letter to match | |
* @param nextStateArg | |
* next state if a match on the letter | |
*/ | |
public WhitespaceOrCaseInsensitiveLetterState(final AbstractParser parser, | |
final char matchLetter, | |
final AbstractParserState | |
nextStateArg) { | |
super(parser); | |
this.lowerLetter = Character.toLowerCase(matchLetter); | |
this.upperLetter = Character.toUpperCase(matchLetter); | |
this.nextState = nextStateArg; | |
} | |
/** | |
* 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 == lowerLetter || ch == upperLetter) { | |
return nextState; | |
} | |
if (ch == ' ' || ch == '\t') { | |
return this; | |
} | |
if (ch == '\n') { | |
getParser().getNewLineState(); | |
} | |
return null; | |
} | |
} |