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Enables analysis of JavaScript projects.

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/*
 * SonarQube JavaScript Plugin
 * Copyright (C) 2011 SonarSource and Eriks Nukis
 * [email protected]
 *
 * 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.plugins.javascript.cpd;

import com.sonar.sslr.api.GenericTokenType;
import com.sonar.sslr.api.Token;
import com.sonar.sslr.impl.Lexer;
import net.sourceforge.pmd.cpd.SourceCode;
import net.sourceforge.pmd.cpd.TokenEntry;
import net.sourceforge.pmd.cpd.Tokenizer;
import net.sourceforge.pmd.cpd.Tokens;
import org.sonar.javascript.EcmaScriptConfiguration;
import org.sonar.javascript.lexer.EcmaScriptLexer;

import java.io.File;
import java.nio.charset.Charset;
import java.util.List;

public class JavaScriptTokenizer implements Tokenizer {

  private final Charset charset;

  public JavaScriptTokenizer(Charset charset) {
    this.charset = charset;
  }

  @Override
  public final void tokenize(SourceCode source, Tokens cpdTokens) {
    Lexer lexer = EcmaScriptLexer.create(new EcmaScriptConfiguration(charset));
    String fileName = source.getFileName();
    List tokens = lexer.lex(new File(fileName));
    for (Token token : tokens) {
      TokenEntry cpdToken = new TokenEntry(getTokenImage(token), fileName, token.getLine());
      cpdTokens.add(cpdToken);
    }
    cpdTokens.add(TokenEntry.getEOF());
  }

  private String getTokenImage(Token token) {
    if (token.getType() == GenericTokenType.LITERAL) {
      return GenericTokenType.LITERAL.getValue();
    }
    return token.getValue();
  }

}