154 lines
3.9 KiB
C++
154 lines
3.9 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 "core/alloc_func.hpp"
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#include "string_func.h"
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#include "strings_func.h"
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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 WChar STATE_WHITESPACE = ' ';
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static const WChar STATE_WORD = 'w';
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static const WChar STATE_QUOTE1 = '\'';
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static const WChar 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(const char *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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free(this->filter_buffer);
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assert(str != nullptr);
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char *dest = MallocT<char>(strlen(str) + 1);
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this->filter_buffer = dest;
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WChar state = STATE_WHITESPACE;
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const char *pos = str;
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WordState *word = nullptr;
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size_t len;
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for (;; pos += len) {
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WChar c;
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len = Utf8Decode(&c, pos);
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if (c == 0 || (state == STATE_WORD && IsWhitespace(c))) {
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/* Finish word */
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if (word != nullptr) {
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*(dest++) = '\0';
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word = nullptr;
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}
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state = STATE_WHITESPACE;
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if (c != 0) continue; else break;
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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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if (word == nullptr) {
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word = &this->word_index.emplace_back(WordState{ dest, false });
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}
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memcpy(dest, pos, len);
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dest += len;
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}
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}
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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(const std::string &str)
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{
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this->SetFilterTerm(str.c_str());
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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(const char *str)
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{
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if (str == nullptr) return;
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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 ((match_case ? strstr(str, ws.start) : strcasestr(str, ws.start)) != nullptr) {
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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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* 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(const std::string &str)
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{
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AddLine(str.c_str());
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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(StringID str)
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{
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AddLine(GetString(str));
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}
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