142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
/*
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Copyright (c) 2019 yvt
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This file is part of OpenSpades.
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OpenSpades is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenSpades is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenSpades. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <utility>
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#include <Core/Debug.h>
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#include "ConsoleCommandCandidate.h"
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namespace spades {
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namespace gui {
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namespace {
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class MergeConsoleCommandCandidates final : public ConsoleCommandCandidateIterator {
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Handle<ConsoleCommandCandidateIterator> first;
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Handle<ConsoleCommandCandidateIterator> second;
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bool hasFirst : 1;
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bool hasSecond : 1;
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bool chooseSecond : 1;
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bool initial : 1;
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public:
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MergeConsoleCommandCandidates(Handle<ConsoleCommandCandidateIterator> first,
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Handle<ConsoleCommandCandidateIterator> second)
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: first{std::move(first)},
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second{std::move(second)},
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hasFirst{true},
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hasSecond{true},
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chooseSecond{false},
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initial{true} {}
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const ConsoleCommandCandidate &GetCurrent() override {
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SPADES_MARK_FUNCTION_DEBUG();
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return chooseSecond ? second->GetCurrent() : first->GetCurrent();
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}
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bool MoveNext() override {
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SPADES_MARK_FUNCTION_DEBUG();
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if (initial) {
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hasFirst = first->MoveNext();
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hasSecond = second->MoveNext();
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initial = false;
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} else {
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if (chooseSecond) {
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hasSecond = second->MoveNext();
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} else {
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hasFirst = first->MoveNext();
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}
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}
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if (!hasSecond && !hasFirst) {
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return false;
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} else if (!hasFirst) {
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chooseSecond = true;
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} else if (!hasSecond) {
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chooseSecond = false;
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} else {
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chooseSecond = second->GetCurrent().name < first->GetCurrent().name;
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}
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return true;
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}
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};
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} // namespace
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Handle<ConsoleCommandCandidateIterator>
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MergeCandidates(Handle<ConsoleCommandCandidateIterator> first,
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Handle<ConsoleCommandCandidateIterator> second) {
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SPADES_MARK_FUNCTION();
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return {new MergeConsoleCommandCandidates{std::move(first), std::move(second)}, false};
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}
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namespace {
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/** Equivalent to `std::string::starts_with` (since C++20) */
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bool StartsWith(const std::string &subject, const std::string &prefix) {
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// FIXME: Code duplicate (see `ConfigConsoleResponder.cpp`)
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if (subject.size() < prefix.size()) {
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return false;
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}
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for (std::size_t i = 0; i < prefix.size(); ++i) {
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if (subject[i] != prefix[i]) {
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return false;
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}
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}
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return true;
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}
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class MapIterator : public ConsoleCommandCandidateIterator {
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const std::map<std::string, std::string> &items;
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std::string query;
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std::map<std::string, std::string>::const_iterator it;
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ConsoleCommandCandidate current;
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public:
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MapIterator(const std::map<std::string, std::string> &items,
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const std::string &query)
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: items{items}, query{query} {
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// Find the starting position
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it = items.lower_bound(query);
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}
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const ConsoleCommandCandidate &GetCurrent() override { return current; }
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bool MoveNext() override {
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if (it == items.end() || !StartsWith(it->first, query)) {
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return false;
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}
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// Create `ConsoleCommandCandidate` for the current item
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current.name = it->first;
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current.description = it->second;
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++it;
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return true;
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}
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};
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} // namespace
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Handle<ConsoleCommandCandidateIterator>
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MakeCandidates(const std::map<std::string, std::string> &items, const std::string &query) {
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return {new MapIterator{items, query}, false};
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}
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} // namespace gui
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} // namespace spades
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