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/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file stringfilter.cpp Searching and filtering using a stringterm. */
#include "stdafx.h"
#include "string_func.h"
#include "strings_func.h"
#include "stringfilter_type.h"
#include "gfx_func.h"
#include "safeguards.h"
static const WChar STATE_WHITESPACE = ' ';
static const WChar STATE_WORD = 'w';
static const WChar STATE_QUOTE1 = '\'';
static const WChar STATE_QUOTE2 = '"';
/**
* Set the term to filter on.
* @param str Filter term
*/
void StringFilter::SetFilterTerm(const char *str)
{
this->word_index.clear();
this->word_index.shrink_to_fit();
this->word_matches = 0;
free(this->filter_buffer);
assert(str != nullptr);
char *dest = MallocT<char>(strlen(str) + 1);
this->filter_buffer = dest;
WChar state = STATE_WHITESPACE;
const char *pos = str;
WordState *word = nullptr;
size_t len;
for (;; pos += len) {
WChar c;
len = Utf8Decode(&c, pos);
if (c == 0 || (state == STATE_WORD && IsWhitespace(c))) {
/* Finish word */
if (word != nullptr) {
*(dest++) = '\0';
word = nullptr;
}
state = STATE_WHITESPACE;
if (c != 0) continue; else break;
}
if (state == STATE_WHITESPACE) {
/* Skip whitespace */
if (IsWhitespace(c)) continue;
state = STATE_WORD;
}
if (c == STATE_QUOTE1 || c == STATE_QUOTE2) {
if (state == c) {
/* Stop quoting */
state = STATE_WORD;
continue;
} else if (state == STATE_WORD) {
/* Start quoting */
state = c;
continue;
}
}
/* Add to word */
if (word == nullptr) {
word = &this->word_index.emplace_back(WordState{ dest, false });
}
memcpy(dest, pos, len);
dest += len;
}
}
/**
* Reset the matching state to process a new item.
*/
void StringFilter::ResetState()
{
this->word_matches = 0;
for (WordState &ws : this->word_index) {
ws.match = false;
}
}
/**
* Pass another text line from the current item to the filter.
*
* You can call this multiple times for a single item, if the filter shall apply to multiple things.
* Before processing the next item you have to call ResetState().
*
* @param str Another line from the item.
*/
void StringFilter::AddLine(const char *str)
{
if (str == nullptr) return;
bool match_case = this->case_sensitive != nullptr && *this->case_sensitive;
for (WordState &ws : this->word_index) {
if (!ws.match) {
if ((match_case ? strstr(str, ws.start) : strcasestr(str, ws.start)) != nullptr) {
ws.match = true;
this->word_matches++;
}
}
}
}
/**
* Pass another text line from the current item to the filter.
*
* You can call this multiple times for a single item, if the filter shall apply to multiple things.
* Before processing the next item you have to call ResetState().
*
* @param str Another line from the item.
*/
void StringFilter::AddLine(StringID str)
{
char buffer[DRAW_STRING_BUFFER];
GetString(buffer, str, lastof(buffer));
AddLine(buffer);
}
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