python/src/com/jetbrains/python/parsing/FollowingCommentBinder.java

/*
 * Copyright 2000-2013 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jetbrains.python.parsing;

import com.intellij.lang.WhitespacesAndCommentsBinder;
import com.intellij.psi.tree.IElementType;
import com.jetbrains.python.PyTokenTypes;

import java.util.List;

/**
* @author yole
*/
class FollowingCommentBinder implements WhitespacesAndCommentsBinder {
  static final FollowingCommentBinder INSTANCE = new FollowingCommentBinder();

  @Override
  public int getEdgePosition(List<IElementType> tokens, boolean atStreamEdge, TokenTextGetter getter) {
    if (tokens.size() <= 1) return 0;
    int pos = 0;
    // TODO[yole] handle more cases?
    while (pos < tokens.size() && tokens.get(pos) == PyTokenTypes.LINE_BREAK) {
      final CharSequence charSequence = getter.get(pos);
      if (charSequence.length() == 0 || charSequence.charAt(charSequence.length()-1) != ' ') {
        break;
      }
      pos++;
      if (pos == tokens.size() || tokens.get(pos) != PyTokenTypes.END_OF_LINE_COMMENT) {
        break;
      }
      pos++;
    }
    return pos;
  }
}