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/*
*
* Copyright 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.trolltech;
import java.io.IOException;
import java.io.Reader;
import net.sf.antcontrib.cpptasks.parser.AbstractParser;
import net.sf.antcontrib.cpptasks.parser.AbstractParserState;
import net.sf.antcontrib.cpptasks.parser.LetterState;
import net.sf.antcontrib.cpptasks.parser.WhitespaceOrLetterState;
/**
* Scans a source file for Q_OBJECT.
*
* @author Curt Arnold
*/
public final class MetaObjectParser
extends AbstractParser {
/**
* Parser state that matches file T character.
*/
private static final class FinalTState
extends AbstractParserState {
/**
* Parser.
*/
private final MetaObjectParser mocParser;
/**
* Constructor.
* @param parser MetaObjectParser parser
*/
public FinalTState(final MetaObjectParser parser) {
super(parser);
this.mocParser = parser;
}
/**
* 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 == 'T') {
mocParser.setQObject(true);
return null;
}
if (ch == '\n') {
getParser().getNewLineState();
}
return null;
}
}
/**
* Determines if source file contains Q_OBJECT.
* @param reader Reader source reader
* @throws IOException if unable to read source file
* @return boolean true if source contains Q_OBJECT
*/
public static boolean hasQObject(final Reader reader) throws IOException {
MetaObjectParser parser = new MetaObjectParser();
parser.parse(reader);
return parser.hasQObject;
}
/**
* Has Q_OBJECT been encountered.
*/
private boolean hasQObject = false;
/**
* Parser state for start of new line.
*/
private AbstractParserState newLineState;
/**
* Constructor.
*
*/
private MetaObjectParser() {
//
// search for Q_OBJECT
//
AbstractParserState t = new FinalTState(this);
AbstractParserState c = new LetterState(this, 'C', t, null);
AbstractParserState e = new LetterState(this, 'E', c, null);
AbstractParserState j = new LetterState(this, 'J', e, null);
AbstractParserState b = new LetterState(this, 'B', j, null);
AbstractParserState o = new LetterState(this, 'O', b, null);
AbstractParserState underline = new LetterState(this, '_', o, null);
newLineState = new WhitespaceOrLetterState(this, 'Q', underline);
}
/**
* Adds a filename to the list of included files.
*
* @param filename filename to be added
*/
protected void addFilename(final String filename) {
}
/**
* Gets new line state.
* @return AbstractParserState new line state.
*/
public AbstractParserState getNewLineState() {
return newLineState;
}
/**
* Parse input file.
* @param reader Reader source file
* @throws IOException if error reading source file
*/
public void parse(final Reader reader) throws IOException {
hasQObject = false;
super.parse(reader);
}
/**
* Called FinalTState to set that Q_OBJECT was found.
* @param value boolean new value for hasQObject
*/
public void setQObject(final boolean value) {
this.hasQObject = value;
}
}
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