| // Copyright 2020 The Fuchsia Authors |
| // |
| // Use of this source code is governed by a MIT-style |
| // license that can be found in the LICENSE file or at |
| // https://opensource.org/licenses/MIT |
| |
| #include <lib/boot-options/word-view.h> |
| |
| using namespace std::literals; |
| |
| WordView::iterator& WordView::iterator::operator++() { |
| Check(); |
| |
| // Advance past the current word. |
| rest_.remove_prefix(word_.size()); |
| |
| constexpr auto kWhitespace = " \n\r\t\0"sv; |
| if (auto nonws = rest_.find_first_not_of(kWhitespace); nonws == std::string_view::npos) { |
| // Nothing but whitespace, so no more words. Advance to end() state. |
| rest_.remove_prefix(rest_.size()); |
| // operator*() is invalid in end() state, but maintain Check() invariant. |
| word_ = rest_; |
| } else { |
| rest_.remove_prefix(nonws); |
| if (auto ws = rest_.find_first_of(kWhitespace); ws == std::string_view::npos) { |
| // No more whitespace, so this is the last word. |
| word_ = rest_; |
| } else { |
| // Chop off the word operator* returns. Next ++ will advance past it. |
| word_ = rest_.substr(0, ws); |
| } |
| } |
| |
| Check(); |
| return *this; |
| } |