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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// 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
// distribution.
// * Neither the name of Google Inc. nor the names of its
// 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,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include <algorithm>
#include "chrome/browser/title_chomper.h"
#include "base/logging.h"
#include "base/word_iterator.h"
TitleChomper::TitleChomper() {
}
void TitleChomper::AddTitle(const std::wstring& title) {
titles_.push_back(title);
}
void TitleChomper::ChompTitles(std::vector<std::wstring>* chomped_titles) {
std::vector<std::wstring>::iterator title;
for (title = titles_.begin(); title != titles_.end(); ++title) {
std::wstring chomped;
GenerateChompedTitle(*title, &chomped);
chomped_titles->push_back(chomped);
}
}
void TitleChomper::GenerateChompedTitle(const std::wstring& title,
std::wstring* chomped_title) {
// We don't chomp identical titles, since they would chomp to nothing!
if (title == last_title_) {
*chomped_title = title;
last_words_.clear();
return;
}
last_title_ = title;
// TODO(beng): fix locale
WordIterator iter(title, WordIterator::BREAK_WORD);
if (!iter.Init())
return;
int chomp_point = 0;
size_t count = 0;
std::vector<std::wstring> words;
bool record_next_point = false;
bool found_chomp_point = false;
while (iter.Advance()) {
if (iter.IsWord()) {
const std::wstring fragment = iter.GetWord();
words.push_back(fragment);
size_t last_words_size = last_words_.size();
bool word_mismatch =
(count < last_words_size && last_words_.at(count) != fragment) ||
(last_words_size > 0 && count >= last_words_size);
if (!found_chomp_point && word_mismatch) {
// Need to wait until the next word point so that we skip any spaces or
// punctuation at the start of the string.
record_next_point = true;
}
++count;
}
if (!found_chomp_point && record_next_point) {
chomp_point = iter.prev();
found_chomp_point = true;
}
}
last_words_ = words;
chomped_title->assign(title.substr(chomp_point));
}
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