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db/Helpers: move code to tag/Set.cxx

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This commit is contained in:
Max Kellermann
2014-04-24 18:29:11 +02:00
parent 9e50993c13
commit ecc12c9ba1
4 changed files with 132 additions and 90 deletions
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89
src/db/Helpers.cxx
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@@ -40,101 +40,14 @@ struct StringLess {
typedef std::set<const char *, StringLess> StringSet;
/**
* Copy all tag items of the specified type.
*/
static bool
CopyTagItem(TagBuilder &dest, TagType dest_type,
const Tag &src, TagType src_type)
{
bool found = false;
const unsigned n = src.num_items;
for (unsigned i = 0; i < n; ++i) {
if (src.items[i]->type == src_type) {
dest.AddItem(dest_type, src.items[i]->value);
found = true;
}
}
return found;
}
/**
* Copy all tag items of the specified type. Fall back to "Artist" if
* there is no "AlbumArtist".
*/
static void
CopyTagItem(TagBuilder &dest, const Tag &src, TagType type)
{
if (!CopyTagItem(dest, type, src, type) &&
type == TAG_ALBUM_ARTIST)
CopyTagItem(dest, type, src, TAG_ARTIST);
}
/**
* Copy all tag items of the types in the mask.
*/
static void
CopyTagMask(TagBuilder &dest, const Tag &src, uint32_t mask)
{
for (unsigned i = 0; i < TAG_NUM_OF_ITEM_TYPES; ++i)
if ((mask & (1u << i)) != 0)
CopyTagItem(dest, src, TagType(i));
}
static void
InsertUniqueTag(TagSet &set, const Tag &src, TagType type, const char *value,
uint32_t group_mask)
{
TagBuilder builder;
if (value == nullptr)
builder.AddEmptyItem(type);
else
builder.AddItem(type, value);
CopyTagMask(builder, src, group_mask);
#if defined(__clang__) || GCC_CHECK_VERSION(4,8)
set.emplace(builder.Commit());
#else
set.insert(builder.Commit());
#endif
}
static bool
CheckUniqueTag(TagSet &set, TagType dest_type,
const Tag &tag, TagType src_type,
uint32_t group_mask)
{
bool found = false;
for (unsigned i = 0; i < tag.num_items; ++i) {
if (tag.items[i]->type == src_type) {
InsertUniqueTag(set, tag, dest_type,
tag.items[i]->value,
group_mask);
found = true;
}
}
return found;
}
static bool
CollectTags(TagSet &set, TagType tag_type, uint32_t group_mask,
const LightSong &song)
{
static_assert(sizeof(group_mask) * 8 >= TAG_NUM_OF_ITEM_TYPES,
"Mask is too small");
assert((group_mask & (1u << unsigned(tag_type))) == 0);
assert(song.tag != nullptr);
const Tag &tag = *song.tag;
if (!CheckUniqueTag(set, tag_type, tag, tag_type, group_mask) &&
(tag_type != TAG_ALBUM_ARTIST ||
/* fall back to "Artist" if no "AlbumArtist" was found */
!CheckUniqueTag(set, tag_type, tag, TAG_ARTIST, group_mask)))
InsertUniqueTag(set, tag, tag_type, nullptr, group_mask);
set.InsertUnique(tag, tag_type, group_mask);
return true;
}