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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.metrics;

import com.google.common.collect.Sets;
import com.sonar.sslr.api.AstAndTokenVisitor;
import com.sonar.sslr.api.AstNode;
import com.sonar.sslr.api.Token;
import org.sonar.squidbridge.SquidAstVisitor;
import org.sonar.squidbridge.measures.MetricDef;
import org.sonar.sslr.parser.LexerlessGrammar;

import javax.annotation.Nullable;
import java.util.Set;

import static com.sonar.sslr.api.GenericTokenType.EOF;

/**
 * Visitor that computes the number of lines of code of a file.
 */
public class LinesOfCodeVisitor extends SquidAstVisitor implements AstAndTokenVisitor {

  private final MetricDef metric;
  private Set lines = Sets.newHashSet();

  public LinesOfCodeVisitor(MetricDef metric) {
    this.metric = metric;
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void visitFile(AstNode node) {
    lines.clear();
  }

  /**
   * {@inheritDoc}
   */
  @Override
  public void visitToken(Token token) {
    if (token.getType() != EOF) {
      lines.add(token.getLine());
    }
  }

  @Override
  public void leaveFile(@Nullable AstNode astNode) {
    getContext().peekSourceCode().add(metric, lines.size());
  }
}