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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.javascript.lexer;

import com.sonar.sslr.api.GenericTokenType;
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 org.sonar.javascript.api.EcmaScriptTokenType;

import static com.sonar.sslr.impl.channel.RegexpChannelBuilder.commentRegexp;
import static com.sonar.sslr.impl.channel.RegexpChannelBuilder.regexp;

public final class 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 final String NUMERIC_LITERAL = "(?:"
      // Decimal
      + "[0-9]++\\.([0-9]++)?+" + EXP + "?+" + FLOAT_SUFFIX + "?+"
      // Decimal
      + "|\\.[0-9]++" + EXP + "?+" + FLOAT_SUFFIX + "?+"
      // Decimal
      + "|[0-9]++" + FLOAT_SUFFIX
      + "|[0-9]++" + EXP + FLOAT_SUFFIX + "?+"
      // Hexadecimal
      + "|0[xX][0-9a-fA-F]++\\.[0-9a-fA-F_]*+" + BINARY_EXP + "?+" + FLOAT_SUFFIX + "?+"
      // Hexadecimal
      + "|0[xX][0-9a-fA-F]++" + BINARY_EXP + FLOAT_SUFFIX + "?+"

      // Integer Literals
      // Hexadecimal
      + "|0[xX][0-9a-fA-F]++" + INT_SUFFIX + "?+"
      // Binary (Java 7)
      + "|0[bB][01]++" + INT_SUFFIX + "?+"
      // Decimal and Octal
      + "|[0-9]++" + INT_SUFFIX + "?+"
      + ")";

  public static final String LITERAL = "(?:"
      + "\"([^\"\\\\]*+(\\\\[\\s\\S])?+)*+\""
      + "|'([^'\\\\]*+(\\\\[\\s\\S])?+)*+'"
      + ")";

  public static final String SINGLE_LINE_COMMENT = "//[^\\n\\r]*+|