/*
* Sonar C++ Plugin (Community)
* Copyright (C) 2011 Waleri Enns and CONTACT Software GmbH
* dev@sonar.codehaus.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02
*/
package org.sonar.cxx.preprocessor;
import com.google.common.collect.ImmutableMap;
import com.sonar.sslr.api.Token;
import com.sonar.sslr.api.TokenType;
import com.sonar.sslr.impl.Lexer;
import org.sonar.channel.Channel;
import org.sonar.channel.CodeReader;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import static com.sonar.sslr.api.GenericTokenType.IDENTIFIER;
import static org.sonar.cxx.api.CppPunctuator.HASH;
public class KeywordChannel extends Channel<Lexer> {
private final Map<String, TokenType> keywordsMap;
private final StringBuilder tmpBuilder = new StringBuilder();
private final Matcher matcher;
private final Token.Builder tokenBuilder = Token.builder();
public KeywordChannel(String regexp, TokenType[]... keywordSets) {
ImmutableMap.Builder<String, TokenType> keywordsMapBuilder = ImmutableMap.builder();
for (TokenType[] keywords : keywordSets) {
for (TokenType keyword : keywords) {
keywordsMapBuilder.put(keyword.getValue(), keyword);
}
}
this.keywordsMap = keywordsMapBuilder.build();
matcher = Pattern.compile(regexp).matcher("");
}
@Override
public boolean consume(CodeReader code, Lexer lexer) {
if (code.popTo(matcher, tmpBuilder) > 0) {
String word = tmpBuilder.toString();
tmpBuilder.delete(0, tmpBuilder.length());
// do this work to strip potential whitespace between the hash and the directive
String identifier = word.substring(1, word.length()).trim();
String potentialKeyword = HASH.getValue() + identifier;
TokenType keywordType = keywordsMap.get(potentialKeyword);
if (keywordType != null) {
Token token = tokenBuilder
.setType(keywordType)
.setValueAndOriginalValue(potentialKeyword)
.setURI(lexer.getURI())
.setLine(code.getPreviousCursor().getLine())
.setColumn(code.getPreviousCursor().getColumn())
.build();
lexer.addToken(token);
}
else {
// if its not a keyword, then it is a sequence of a hash followed by an identifier
lexer.addToken(tokenBuilder
.setType(HASH)
.setValueAndOriginalValue(HASH.getValue())
.setURI(lexer.getURI())
.setLine(code.getPreviousCursor().getLine())
.setColumn(code.getPreviousCursor().getColumn())
.build());
lexer.addToken(tokenBuilder
.setType(IDENTIFIER)
.setValueAndOriginalValue(identifier)
.setURI(lexer.getURI())
.setLine(code.getPreviousCursor().getLine())
.setColumn(code.getPreviousCursor().getColumn())
.build());
}
return true;
}
return false;
}
}