/*
Copyright 2011-2016 Google Inc. All Rights Reserved.

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.google.security.zynamics.zylib.gui.zygraph.realizers.KeyBehaviours.Tokenizer;

import com.google.common.base.Preconditions;

public class CMultiCommentLineTokenizer {
  private final String m_text;

  private final String m_delimiter;

  private int m_pointer = 0;

  public CMultiCommentLineTokenizer(final String text, final String delimiter) {
    m_delimiter = Preconditions.checkNotNull(delimiter, "Error: Text delimiter can't be null.");
    Preconditions.checkArgument(!("".equals(delimiter)), "Error: Text delimiter can't be empty.");
    m_text = Preconditions.checkNotNull(text, "Error: Text can't be null.");
  }

  public boolean hasMoreTokens() {
    return m_pointer < m_text.length();
  }

  public String nextToken() {
    if (m_pointer >= m_text.length()) {
      return null;
    }

    final int startPointer = m_pointer;

    int endPointer = m_text.indexOf(m_delimiter, startPointer) + 1;

    if (endPointer == 0) {
      endPointer = m_text.length();
    }

    m_pointer = endPointer;

    String token = m_text.substring(startPointer, endPointer);

    if (!hasMoreTokens() && !token.isEmpty() && !token.endsWith("\r")) {
      token += "\r";
    }

    return token;
  }
}
