| /* |
| * 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 "util/Utf8Iterator.h" |
| |
| #include "android-base/logging.h" |
| #include "utils/Unicode.h" |
| |
| using ::android::StringPiece; |
| |
| namespace aapt { |
| |
| Utf8Iterator::Utf8Iterator(const StringPiece& str) |
| : str_(str), next_pos_(0), current_codepoint_(0) { |
| DoNext(); |
| } |
| |
| void Utf8Iterator::DoNext() { |
| size_t next_pos = 0u; |
| int32_t result = utf32_from_utf8_at(str_.data(), str_.size(), next_pos_, &next_pos); |
| if (result == -1) { |
| current_codepoint_ = 0u; |
| } else { |
| current_codepoint_ = static_cast<char32_t>(result); |
| next_pos_ = next_pos; |
| } |
| } |
| |
| bool Utf8Iterator::HasNext() const { |
| return current_codepoint_ != 0; |
| } |
| |
| 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 aapt |