mirror of https://github.com/OpenTTD/OpenTTD
115 lines
3.0 KiB
C++
115 lines
3.0 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file stringfilter.cpp Searching and filtering using a stringterm. */
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#include "stdafx.h"
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#include "string_func.h"
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#include "strings_func.h"
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#include "core/utf8.hpp"
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#include "core/string_builder.hpp"
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#include "stringfilter_type.h"
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#include "gfx_func.h"
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#include "safeguards.h"
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static const char32_t STATE_WHITESPACE = ' ';
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static const char32_t STATE_WORD = 'w';
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static const char32_t STATE_QUOTE1 = '\'';
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static const char32_t STATE_QUOTE2 = '"';
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/**
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* Set the term to filter on.
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* @param str Filter term
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*/
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void StringFilter::SetFilterTerm(std::string_view str)
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{
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this->word_index.clear();
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this->word_index.shrink_to_fit();
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this->word_matches = 0;
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char32_t state = STATE_WHITESPACE;
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std::string word;
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StringBuilder builder(word);
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auto add_word = [this, &word]() {
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if (!word.empty()) this->word_index.emplace_back(std::move(word), false);
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word.clear();
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};
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for (char32_t c : Utf8View(str)) {
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if (state == STATE_WORD && IsWhitespace(c)) {
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/* Finish word */
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add_word();
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state = STATE_WHITESPACE;
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continue;
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}
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if (state == STATE_WHITESPACE) {
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/* Skip whitespace */
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if (IsWhitespace(c)) continue;
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state = STATE_WORD;
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}
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if (c == STATE_QUOTE1 || c == STATE_QUOTE2) {
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if (state == c) {
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/* Stop quoting */
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state = STATE_WORD;
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continue;
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} else if (state == STATE_WORD) {
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/* Start quoting */
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state = c;
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continue;
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}
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}
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/* Add to word */
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builder.PutUtf8(c);
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}
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/* Add the last word of the string. */
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add_word();
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}
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/**
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* Reset the matching state to process a new item.
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*/
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void StringFilter::ResetState()
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{
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this->word_matches = 0;
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for (WordState &ws : this->word_index) {
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ws.match = false;
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}
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}
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/**
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* Pass another text line from the current item to the filter.
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*
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* You can call this multiple times for a single item, if the filter shall apply to multiple things.
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* Before processing the next item you have to call ResetState().
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*
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* @param str Another line from the item.
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*/
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void StringFilter::AddLine(std::string_view str)
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{
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bool match_case = this->case_sensitive != nullptr && *this->case_sensitive;
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for (WordState &ws : this->word_index) {
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if (!ws.match) {
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if (this->locale_aware) {
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if (match_case ? StrNaturalContains(str, ws.word) : StrNaturalContainsIgnoreCase(str, ws.word)) {
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ws.match = true;
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this->word_matches++;
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}
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} else {
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if (match_case ? str.find(ws.word) != str.npos : StrContainsIgnoreCase(str, ws.word)) {
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ws.match = true;
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this->word_matches++;
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}
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}
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}
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}
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}
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