788e3b31e1
The "pure" and "const" attributes are not so well-defined, and a recent clang version implements an optimization which pushes the definition's boundary beyond what I believed it was. clang now assumes that functions declared "pure" cannot throw exceptions, even if they lack the "noexcept" specification. When compiled with this new clang version, MPD will crash randomly if an exception happens to get thrown by such as "pure" function (https://github.com/MusicPlayerDaemon/MPD/issues/41). This commit removes all such misplaced "pure" and "const" attributes, closing #41.
286 lines
6.4 KiB
C++
286 lines
6.4 KiB
C++
/*
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* Copyright 2003-2017 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "SongFilter.hxx"
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#include "db/LightSong.hxx"
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#include "DetachedSong.hxx"
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#include "tag/Tag.hxx"
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#include "util/ConstBuffer.hxx"
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#include "util/StringAPI.hxx"
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#include "util/ASCII.hxx"
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#include "util/TimeParser.hxx"
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#include "util/UriUtil.hxx"
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#include "lib/icu/Collate.hxx"
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#include <stdexcept>
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#include <assert.h>
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#include <stdlib.h>
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#define LOCATE_TAG_FILE_KEY "file"
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#define LOCATE_TAG_FILE_KEY_OLD "filename"
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#define LOCATE_TAG_ANY_KEY "any"
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unsigned
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locate_parse_type(const char *str) noexcept
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{
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if (StringEqualsCaseASCII(str, LOCATE_TAG_FILE_KEY) ||
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StringEqualsCaseASCII(str, LOCATE_TAG_FILE_KEY_OLD))
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return LOCATE_TAG_FILE_TYPE;
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if (StringEqualsCaseASCII(str, LOCATE_TAG_ANY_KEY))
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return LOCATE_TAG_ANY_TYPE;
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if (strcmp(str, "base") == 0)
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return LOCATE_TAG_BASE_TYPE;
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if (strcmp(str, "modified-since") == 0)
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return LOCATE_TAG_MODIFIED_SINCE;
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return tag_name_parse_i(str);
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}
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static AllocatedString<>
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ImportString(const char *p, bool fold_case)
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{
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return fold_case
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? IcuCaseFold(p)
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: AllocatedString<>::Duplicate(p);
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}
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SongFilter::Item::Item(unsigned _tag, const char *_value, bool _fold_case)
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:tag(_tag), fold_case(_fold_case),
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value(ImportString(_value, _fold_case))
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{
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}
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SongFilter::Item::Item(unsigned _tag, time_t _time)
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:tag(_tag), value(nullptr), time(_time)
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{
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}
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bool
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SongFilter::Item::StringMatch(const char *s) const noexcept
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{
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#if !CLANG_CHECK_VERSION(3,6)
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/* disabled on clang due to -Wtautological-pointer-compare */
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assert(s != nullptr);
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#endif
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assert(tag != LOCATE_TAG_MODIFIED_SINCE);
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if (fold_case) {
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const auto folded = IcuCaseFold(s);
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assert(!folded.IsNull());
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return StringFind(folded.c_str(), value.c_str()) != nullptr;
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} else {
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return StringIsEqual(s, value.c_str());
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}
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}
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bool
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SongFilter::Item::Match(const TagItem &item) const noexcept
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{
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return (tag == LOCATE_TAG_ANY_TYPE || (unsigned)item.type == tag) &&
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StringMatch(item.value);
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}
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bool
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SongFilter::Item::Match(const Tag &_tag) const noexcept
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{
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bool visited_types[TAG_NUM_OF_ITEM_TYPES];
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std::fill_n(visited_types, size_t(TAG_NUM_OF_ITEM_TYPES), false);
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for (const auto &i : _tag) {
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visited_types[i.type] = true;
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if (Match(i))
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return true;
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}
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if (tag < TAG_NUM_OF_ITEM_TYPES && !visited_types[tag]) {
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/* If the search critieron was not visited during the
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sweep through the song's tag, it means this field
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is absent from the tag or empty. Thus, if the
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searched string is also empty
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then it's a match as well and we should return
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true. */
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if (value.empty())
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return true;
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if (tag == TAG_ALBUM_ARTIST && visited_types[TAG_ARTIST]) {
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/* if we're looking for "album artist", but
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only "artist" exists, use that */
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for (const auto &item : _tag)
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if (item.type == TAG_ARTIST &&
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StringMatch(item.value))
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return true;
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}
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}
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return false;
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}
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bool
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SongFilter::Item::Match(const DetachedSong &song) const noexcept
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{
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if (tag == LOCATE_TAG_BASE_TYPE)
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return uri_is_child_or_same(value.c_str(), song.GetURI());
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if (tag == LOCATE_TAG_MODIFIED_SINCE)
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return song.GetLastModified() >= time;
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if (tag == LOCATE_TAG_FILE_TYPE)
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return StringMatch(song.GetURI());
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return Match(song.GetTag());
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}
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bool
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SongFilter::Item::Match(const LightSong &song) const noexcept
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{
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if (tag == LOCATE_TAG_BASE_TYPE) {
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const auto uri = song.GetURI();
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return uri_is_child_or_same(value.c_str(), uri.c_str());
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}
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if (tag == LOCATE_TAG_MODIFIED_SINCE)
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return song.mtime >= time;
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if (tag == LOCATE_TAG_FILE_TYPE) {
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const auto uri = song.GetURI();
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return StringMatch(uri.c_str());
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}
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return Match(*song.tag);
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}
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SongFilter::SongFilter(unsigned tag, const char *value, bool fold_case)
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{
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items.push_back(Item(tag, value, fold_case));
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}
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SongFilter::~SongFilter()
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{
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/* this destructor exists here just so it won't get inlined */
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}
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gcc_pure
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static time_t
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ParseTimeStamp(const char *s) noexcept
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{
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assert(s != nullptr);
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char *endptr;
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unsigned long long value = strtoull(s, &endptr, 10);
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if (*endptr == 0 && endptr > s)
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/* it's an integral UNIX time stamp */
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return (time_t)value;
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try {
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/* try ISO 8601 */
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const auto t = ParseTimePoint(s, "%FT%TZ");
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return std::chrono::system_clock::to_time_t(t);
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} catch (const std::runtime_error &) {
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return 0;
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}
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}
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bool
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SongFilter::Parse(const char *tag_string, const char *value, bool fold_case)
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{
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unsigned tag = locate_parse_type(tag_string);
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if (tag == TAG_NUM_OF_ITEM_TYPES)
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return false;
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if (tag == LOCATE_TAG_BASE_TYPE) {
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if (!uri_safe_local(value))
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return false;
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/* case folding doesn't work with "base" */
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fold_case = false;
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}
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if (tag == LOCATE_TAG_MODIFIED_SINCE) {
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time_t t = ParseTimeStamp(value);
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if (t == 0)
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return false;
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items.push_back(Item(tag, t));
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return true;
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}
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items.push_back(Item(tag, value, fold_case));
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return true;
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}
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bool
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SongFilter::Parse(ConstBuffer<const char *> args, bool fold_case)
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{
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if (args.size == 0 || args.size % 2 != 0)
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return false;
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for (unsigned i = 0; i < args.size; i += 2)
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if (!Parse(args[i], args[i + 1], fold_case))
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return false;
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return true;
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}
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bool
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SongFilter::Match(const DetachedSong &song) const noexcept
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{
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for (const auto &i : items)
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if (!i.Match(song))
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return false;
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return true;
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}
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bool
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SongFilter::Match(const LightSong &song) const noexcept
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{
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for (const auto &i : items)
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if (!i.Match(song))
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return false;
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return true;
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}
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bool
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SongFilter::HasOtherThanBase() const noexcept
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{
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for (const auto &i : items)
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if (i.GetTag() != LOCATE_TAG_BASE_TYPE)
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return true;
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return false;
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}
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const char *
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SongFilter::GetBase() const noexcept
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{
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for (const auto &i : items)
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if (i.GetTag() == LOCATE_TAG_BASE_TYPE)
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return i.GetValue();
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return nullptr;
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}
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