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Diffstat (limited to 'src/SongFilter.cxx')
| -rw-r--r-- | src/SongFilter.cxx | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/SongFilter.cxx b/src/SongFilter.cxx new file mode 100644 index 000000000..4b8ae20ba --- /dev/null +++ b/src/SongFilter.cxx @@ -0,0 +1,179 @@ +/* + * Copyright (C) 2003-2012 The Music Player Daemon Project + * http://www.musicpd.org + * + * This program 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; either version 2 of the License, or + * (at your option) any later version. + * + * This program 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 this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" +#include "SongFilter.hxx" +#include "Song.hxx" +#include "tag/Tag.hxx" + +#include <glib.h> + +#include <assert.h> +#include <string.h> +#include <stdlib.h> + +#define LOCATE_TAG_FILE_KEY "file" +#define LOCATE_TAG_FILE_KEY_OLD "filename" +#define LOCATE_TAG_ANY_KEY "any" + +unsigned +locate_parse_type(const char *str) +{ + if (0 == g_ascii_strcasecmp(str, LOCATE_TAG_FILE_KEY) || + 0 == g_ascii_strcasecmp(str, LOCATE_TAG_FILE_KEY_OLD)) + return LOCATE_TAG_FILE_TYPE; + + if (0 == g_ascii_strcasecmp(str, LOCATE_TAG_ANY_KEY)) + return LOCATE_TAG_ANY_TYPE; + + return tag_name_parse_i(str); +} + +SongFilter::Item::Item(unsigned _tag, const char *_value, bool _fold_case) + :tag(_tag), fold_case(_fold_case), + value(fold_case + ? g_utf8_casefold(_value, -1) + : g_strdup(_value)) +{ +} + +SongFilter::Item::~Item() +{ + g_free(value); +} + +bool +SongFilter::Item::StringMatch(const char *s) const +{ + assert(value != nullptr); + assert(s != nullptr); + + if (fold_case) { + char *p = g_utf8_casefold(s, -1); + const bool result = strstr(p, value) != NULL; + g_free(p); + return result; + } else { + return strcmp(s, value) == 0; + } +} + +bool +SongFilter::Item::Match(const TagItem &item) const +{ + return (tag == LOCATE_TAG_ANY_TYPE || (unsigned)item.type == tag) && + StringMatch(item.value); +} + +bool +SongFilter::Item::Match(const Tag &_tag) const +{ + bool visited_types[TAG_NUM_OF_ITEM_TYPES]; + std::fill_n(visited_types, TAG_NUM_OF_ITEM_TYPES, false); + + for (unsigned i = 0; i < _tag.num_items; i++) { + visited_types[_tag.items[i]->type] = true; + + if (Match(*_tag.items[i])) + return true; + } + + if (tag < TAG_NUM_OF_ITEM_TYPES && !visited_types[tag]) { + /* If the search critieron was not visited during the + sweep through the song's tag, it means this field + is absent from the tag or empty. Thus, if the + searched string is also empty (first char is a \0), + then it's a match as well and we should return + true. */ + if (*value == 0) + return true; + + if (tag == TAG_ALBUM_ARTIST && visited_types[TAG_ARTIST]) { + /* if we're looking for "album artist", but + only "artist" exists, use that */ + for (unsigned i = 0; i < _tag.num_items; i++) { + const TagItem &item = *_tag.items[i]; + if (item.type == TAG_ARTIST && + StringMatch(item.value)) + return true; + } + } + } + + return false; +} + +bool +SongFilter::Item::Match(const Song &song) const +{ + if (tag == LOCATE_TAG_FILE_TYPE || tag == LOCATE_TAG_ANY_TYPE) { + char *uri = song.GetURI(); + const bool result = StringMatch(uri); + g_free(uri); + + if (result || tag == LOCATE_TAG_FILE_TYPE) + return result; + } + + return song.tag != NULL && Match(*song.tag); +} + +SongFilter::SongFilter(unsigned tag, const char *value, bool fold_case) +{ + items.push_back(Item(tag, value, fold_case)); +} + +SongFilter::~SongFilter() +{ + /* this destructor exists here just so it won't get inlined */ +} + +bool +SongFilter::Parse(const char *tag_string, const char *value, bool fold_case) +{ + unsigned tag = locate_parse_type(tag_string); + if (tag == TAG_NUM_OF_ITEM_TYPES) + return false; + + items.push_back(Item(tag, value, fold_case)); + return true; +} + +bool +SongFilter::Parse(unsigned argc, char *argv[], bool fold_case) +{ + if (argc == 0 || argc % 2 != 0) + return false; + + for (unsigned i = 0; i < argc; i += 2) + if (!Parse(argv[i], argv[i + 1], fold_case)) + return false; + + return true; +} + +bool +SongFilter::Match(const Song &song) const +{ + for (const auto &i : items) + if (!i.Match(song)) + return false; + + return true; +} |