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/*
 * Sonar JavaScript Plugin
 * Copyright (C) 2011 Eriks Nukis and SonarSource
 * [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.javascript.lexer;

import com.sonar.sslr.impl.Lexer;
import com.sonar.sslr.impl.channel.BlackHoleChannel;
import com.sonar.sslr.impl.channel.IdentifierAndKeywordChannel;
import com.sonar.sslr.impl.channel.PunctuatorChannel;
import com.sonar.sslr.impl.channel.UnknownCharacterChannel;
import org.sonar.javascript.EcmaScriptConfiguration;
import org.sonar.javascript.api.EcmaScriptKeyword;
import org.sonar.javascript.api.EcmaScriptPunctuator;

import static com.sonar.sslr.api.GenericTokenType.LITERAL;
import static com.sonar.sslr.impl.channel.RegexpChannelBuilder.commentRegexp;
import static com.sonar.sslr.impl.channel.RegexpChannelBuilder.regexp;
import static org.sonar.javascript.api.EcmaScriptTokenType.NUMERIC_LITERAL;

public final class EcmaScriptLexer {

  private EcmaScriptLexer() {
  }

  private static final String EXP = "([Ee][+-]?+[0-9_]++)";
  private static final String BINARY_EXP = "([Pp][+-]?+[0-9_]++)";

  private static final String FLOAT_SUFFIX = "[fFdD]";
  private static final String INT_SUFFIX = "[lL]";

  public static Lexer create(EcmaScriptConfiguration conf) {
    return Lexer.builder()
        .withCharset(conf.getCharset())

        .withFailIfNoChannelToConsumeOneCharacter(true)

        // Channels, which consumes more frequently should come first.
        // Whitespace character occurs more frequently than any other, and thus come first:
        .withChannel(new BlackHoleChannel("\\s++"))

        // Comments
        .withChannel(commentRegexp("//[^\\n\\r]*+"))
        .withChannel(commentRegexp("