122 lines
3.1 KiB
C++
122 lines
3.1 KiB
C++
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// Copyright 2011 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/i18n/char_iterator.h"
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#include "base/check_op.h"
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#include "base/third_party/icu/icu_utf.h"
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namespace base {
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namespace i18n {
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// UTF8CharIterator ------------------------------------------------------------
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UTF8CharIterator::UTF8CharIterator(base::StringPiece str)
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: str_(str), array_pos_(0), next_pos_(0), char_pos_(0), char_(0) {
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if (!str_.empty())
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CBU8_NEXT(str_.data(), next_pos_, str_.length(), char_);
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}
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UTF8CharIterator::~UTF8CharIterator() = default;
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bool UTF8CharIterator::Advance() {
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if (array_pos_ >= str_.length())
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return false;
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array_pos_ = next_pos_;
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char_pos_++;
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if (next_pos_ < str_.length())
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CBU8_NEXT(str_.data(), next_pos_, str_.length(), char_);
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return true;
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}
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// UTF16CharIterator -----------------------------------------------------------
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UTF16CharIterator::UTF16CharIterator(StringPiece16 str)
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: UTF16CharIterator(str, 0) {}
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UTF16CharIterator::UTF16CharIterator(UTF16CharIterator&& to_move) = default;
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UTF16CharIterator::~UTF16CharIterator() = default;
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UTF16CharIterator& UTF16CharIterator::operator=(UTF16CharIterator&& to_move) =
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default;
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// static
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UTF16CharIterator UTF16CharIterator::LowerBound(StringPiece16 str,
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size_t array_index) {
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DCHECK_LE(array_index, str.length());
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CBU16_SET_CP_START(str.data(), 0, array_index);
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return UTF16CharIterator(str, array_index);
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}
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// static
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UTF16CharIterator UTF16CharIterator::UpperBound(StringPiece16 str,
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size_t array_index) {
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DCHECK_LE(array_index, str.length());
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CBU16_SET_CP_LIMIT(str.data(), 0, array_index, str.length());
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return UTF16CharIterator(str, array_index);
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}
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int32_t UTF16CharIterator::NextCodePoint() const {
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if (next_pos_ >= str_.length())
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return 0;
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base_icu::UChar32 c;
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CBU16_GET(str_.data(), 0, next_pos_, str_.length(), c);
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return c;
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}
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int32_t UTF16CharIterator::PreviousCodePoint() const {
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if (array_pos_ == 0)
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return 0;
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uint32_t pos = array_pos_;
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base_icu::UChar32 c;
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CBU16_PREV(str_.data(), 0, pos, c);
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return c;
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}
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bool UTF16CharIterator::Advance() {
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if (array_pos_ >= str_.length())
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return false;
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array_pos_ = next_pos_;
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char_offset_++;
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if (next_pos_ < str_.length())
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ReadChar();
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return true;
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}
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bool UTF16CharIterator::Rewind() {
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if (array_pos_ == 0)
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return false;
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next_pos_ = array_pos_;
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char_offset_--;
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CBU16_PREV(str_.data(), 0, array_pos_, char_);
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return true;
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}
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UTF16CharIterator::UTF16CharIterator(StringPiece16 str, size_t initial_pos)
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: str_(str),
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array_pos_(initial_pos),
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next_pos_(initial_pos),
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char_offset_(0),
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char_(0) {
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// This has the side-effect of advancing |next_pos_|.
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if (array_pos_ < str_.length())
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ReadChar();
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}
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void UTF16CharIterator::ReadChar() {
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// This is actually a huge macro, so is worth having in a separate function.
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CBU16_NEXT(str_.data(), next_pos_, str_.length(), char_);
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}
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} // namespace i18n
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} // namespace base
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