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/*
 * Sonar C++ Plugin (Community)
 * Copyright (C) 2011 Waleri Enns and CONTACT Software GmbH
 * [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.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 {

  private final Map 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 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;
  }
}