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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.
*/
#include "text/Utf8Iterator.h"
#include "android-base/logging.h"
#include "utils/Unicode.h"
using ::android::StringPiece;
namespace aapt {
namespace text {
Utf8Iterator::Utf8Iterator(const StringPiece& str)
: str_(str), current_pos_(0), next_pos_(0), current_codepoint_(0) {
DoNext();
}
void Utf8Iterator::DoNext() {
current_pos_ = next_pos_;
int32_t result = utf32_from_utf8_at(str_.data(), str_.size(), current_pos_, &next_pos_);
if (result == -1) {
current_codepoint_ = 0u;
} else {
current_codepoint_ = static_cast<char32_t>(result);
}
}
bool Utf8Iterator::HasNext() const {
return current_codepoint_ != 0;
}
size_t Utf8Iterator::Position() const {
return current_pos_;
}
void Utf8Iterator::Skip(int amount) {
while (amount > 0 && HasNext()) {
Next();
--amount;
}
}
char32_t Utf8Iterator::Next() {
CHECK(HasNext()) << "Next() called after iterator exhausted";
char32_t result = current_codepoint_;
DoNext();
return result;
}
} // namespace text
} // namespace aapt
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