/*
 * Copyright (C) 2014 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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#include "third_party/blink/renderer/platform/text/segmented_string.h"

#include "testing/gtest/include/gtest/gtest.h"

namespace blink {

TEST(SegmentedStringTest, CurrentChar) {
  SegmentedString original(String("cde"));
  {
    SegmentedString copied(original);
    SegmentedString assigned;
    assigned = original;
    EXPECT_EQ("cde", original.ToString());
    EXPECT_EQ('c', original.CurrentChar());
    EXPECT_EQ('c', copied.CurrentChar());
    EXPECT_EQ('c', assigned.CurrentChar());
  }
  original.Push('b');
  {
    SegmentedString copied(original);
    SegmentedString assigned;
    assigned = original;
    EXPECT_EQ("bcde", original.ToString());
    EXPECT_EQ('b', original.CurrentChar());
    EXPECT_EQ('b', copied.CurrentChar());
    EXPECT_EQ('b', assigned.CurrentChar());
  }
  original.Push('a');
  {
    SegmentedString copied(original);
    SegmentedString assigned;
    assigned = original;
    EXPECT_EQ("abcde", original.ToString());
    EXPECT_EQ('a', original.CurrentChar());
    EXPECT_EQ('a', copied.CurrentChar());
    EXPECT_EQ('a', assigned.CurrentChar());
  }
  original.Advance();
  {
    SegmentedString copied(original);
    SegmentedString assigned;
    assigned = original;
    EXPECT_EQ("bcde", original.ToString());
    EXPECT_EQ('b', original.CurrentChar());
    EXPECT_EQ('b', copied.CurrentChar());
    EXPECT_EQ('b', assigned.CurrentChar());
  }
}

TEST(SegmentedStringTest, Prepend) {
  SegmentedString s1("1");
  s1.Append(SegmentedString("2"));
  s1.Append(SegmentedString("3"));
  SegmentedString s2("4");
  s2.Append(SegmentedString("5"));
  s2.Append(SegmentedString("6"));

  s2.Prepend(s1, SegmentedString::PrependType::kUnconsume);

  EXPECT_EQ(s2.ToString(), String("123456"));
}

TEST(SegmentedStringTest, AdvanceSubstringConsumesCharacters) {
  SegmentedString s1("1");
  s1.Append(SegmentedString("2"));
  s1.Append(SegmentedString("3"));

  EXPECT_EQ(s1.NumberOfCharactersConsumed(), 0);
  s1.Advance();
  EXPECT_EQ(s1.NumberOfCharactersConsumed(), 1);
  s1.Advance();
  EXPECT_EQ(s1.NumberOfCharactersConsumed(), 2);
  s1.Advance();
  EXPECT_EQ(s1.NumberOfCharactersConsumed(), 3);
}

TEST(SegmentedStringTest, AdvanceCurrentString) {
  SegmentedString s("0123456789");

  s.Advance(4, 0, 4);
  EXPECT_EQ(6u, s.length());
  EXPECT_EQ(4, s.NumberOfCharactersConsumed());
  EXPECT_EQ(4, s.CurrentColumn().ZeroBasedInt());
  EXPECT_EQ(0, s.CurrentLine().ZeroBasedInt());
  EXPECT_EQ('4', static_cast<char>(s.CurrentChar()));
}

TEST(SegmentedStringTest, AdvanceThroughMultipleStrings) {
  SegmentedString s("a");
  s.Append(SegmentedString("b"));
  s.Append(SegmentedString("c"));
  s.Advance(2, 0, 0);
  EXPECT_EQ(1u, s.length());
  EXPECT_EQ(2, s.NumberOfCharactersConsumed());
  EXPECT_EQ(0, s.CurrentColumn().ZeroBasedInt());
  EXPECT_EQ(0, s.CurrentLine().ZeroBasedInt());
  EXPECT_EQ('c', static_cast<char>(s.CurrentChar()));
}

TEST(SegmentedStringTest, AdvanceThroughNextString) {
  SegmentedString s("0123456789");
  s.Append(SegmentedString("\nabcdefg"));

  // Advance through the first character
  s.Advance();
  // Advance through first string.
  s.Advance(11, 1, 2);
  EXPECT_EQ(6u, s.length());
  EXPECT_EQ(12, s.NumberOfCharactersConsumed());
  EXPECT_EQ(2, s.CurrentColumn().ZeroBasedInt());
  EXPECT_EQ(1, s.CurrentLine().ZeroBasedInt());
  EXPECT_EQ('b', static_cast<char>(s.CurrentChar()));
}

}  // namespace blink