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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.checks;

import org.sonar.api.server.rule.RulesDefinition;
import org.sonar.check.Priority;
import org.sonar.check.Rule;
import org.sonar.javascript.api.EcmaScriptKeyword;
import org.sonar.javascript.api.EcmaScriptPunctuator;
import org.sonar.squidbridge.annotations.ActivatedByDefault;
import org.sonar.squidbridge.annotations.SqaleConstantRemediation;
import org.sonar.squidbridge.annotations.SqaleSubCharacteristic;
import org.sonar.squidbridge.checks.SquidCheck;
import org.sonar.sslr.parser.LexerlessGrammar;

import com.sonar.sslr.api.AstNode;

@Rule(
  key = "EqEqEq",
  name = "\"===\" and \"!==\" should be used instead of \"==\" and \"!=\"",
  priority = Priority.MAJOR,
  tags = {Tags.BUG})
@ActivatedByDefault
@SqaleSubCharacteristic(RulesDefinition.SubCharacteristics.INSTRUCTION_RELIABILITY)
@SqaleConstantRemediation("5min")
public class EqEqEqCheck extends SquidCheck {

  @Override
  public void init() {
    subscribeTo(EcmaScriptPunctuator.EQUAL, EcmaScriptPunctuator.NOTEQUAL);
  }

  @Override
  public void visitNode(AstNode node) {
    if (!comparesWithNull(node)) {

      if (node.is(EcmaScriptPunctuator.EQUAL)) {
        getContext().createLineViolation(this, "Replace \"==\" with \"===\".", node);
      } else if (node.is(EcmaScriptPunctuator.NOTEQUAL)) {
        getContext().createLineViolation(this, "Replace \"!=\" with \"!==\".", node);
      }
    }
  }

  public boolean comparesWithNull(AstNode node) {
    return EcmaScriptKeyword.NULL.getValue().equals(node.getNextSibling().getTokenValue());
  }

}