Fixed lyrics parsing on very long tags

src/libs/metadata/impl/Lyrics.cpp

@@ -34,50 +34,53 @@ namespace lms::metadata
 
     namespace
     {
-        std::string_view getSubmatchString(const std::csub_match& submatch)
+        // Parse a single line with a tag like [ar: Artist] and set the appropriate fields in the Lyrics object
+        bool parseTag(std::string_view line, Lyrics& lyrics)
         {
-            assert(submatch.matched);
-            return std::string_view{ submatch.first, static_cast<std::string_view::size_type>(submatch.length()) };
-        }
+            if (line.empty())
+                return false;
 
-        // Parse a single line with ID tags like [ar: Artist] and set the appropriate fields in the Lyrics object
-        bool parseIDTag(std::string_view line, Lyrics& lyrics)
-        {
-            static const std::regex idTagRegex{ R"(^\[([a-zA-Z_]+):(.+?)\])" };
-            std::cmatch match;
+            if (line.front() != '[' || line.back() != ']') // consider lines are trimmed
+                return false;
 
-            if (std::regex_search(line.data(), line.data() + line.size(), match, idTagRegex))
+            const auto separator{ line.find(':') };
+            if (separator == std::string_view::npos)
+                return false;
+
+            const std::string_view tagType{ core::stringUtils::stringTrim(line.substr(1, separator - 1)) };
+            const std::string_view tagValue{ core::stringUtils::stringTrim(line.substr(separator + 1, line.size() - separator - 2)) };
+
+            if (tagType.empty())
+                return false;
+
+            // check for timestamps
+            if (std::any_of(tagType.begin(), tagType.end(), [](char c) { return std::isdigit(c); }))
+                return false;
+
+            if (tagType == "ar")
             {
-                std::string_view tagType{ getSubmatchString(match[1]) };
-                std::string_view tagValue{ core::stringUtils::stringTrim(getSubmatchString(match[2])) };
-
-                if (tagType == "ar")
-                {
-                    lyrics.displayArtist = tagValue;
-                }
-                else if (tagType == "al")
-                {
-                    lyrics.displayAlbum = tagValue;
-                }
-                else if (tagType == "ti")
-                {
-                    lyrics.displayTitle = tagValue;
-                }
-                else if (tagType == "la")
-                {
-                    lyrics.language = tagValue;
-                }
-                else if (tagType == "offset")
-                {
-                    if (const auto value{ core::stringUtils::readAs<int>(tagValue) })
-                        lyrics.offset = std::chrono::milliseconds{ *value };
-                }
-                // not interrested by other tags like 'duration', 'id', etc.
-
-                return true;
+                lyrics.displayArtist = tagValue;
             }
+            else if (tagType == "al")
+            {
+                lyrics.displayAlbum = tagValue;
+            }
+            else if (tagType == "ti")
+            {
+                lyrics.displayTitle = tagValue;
+            }
+            else if (tagType == "la")
+            {
+                lyrics.language = tagValue;
+            }
+            else if (tagType == "offset")
+            {
+                if (const auto value{ core::stringUtils::readAs<int>(tagValue) })
+                    lyrics.offset = std::chrono::milliseconds{ *value };
+            }
+            // not interrested by other tags like 'duration', 'id', etc.
 
-            return false;
+            return true;
         }
 
         // Parse timestamps from a line and return the associated times in milliseconds
@@ -172,7 +175,7 @@ namespace lms::metadata
             if (currentState == State::None && trimmedLine.empty())
                 continue;
 
-            if (parseIDTag(trimmedLine, lyrics))
+            if (parseTag(trimmedLine, lyrics))
                 continue;
 
             extractTimestamps(trimmedLine, timestamps);

src/libs/metadata/test/Lyrics.cpp

@@ -72,6 +72,34 @@ namespace lms::metadata::tests
         EXPECT_EQ(lyrics.synchronizedLines.find(9s + 160ms)->second, "I, I just woke up from a dream");
     }
 
+    TEST(Lyrics, tagsWithSpaces)
+    {
+        std::istringstream is{ R"([al:    dqsxdkbu ]  
+[00:09.16]I, I just woke up from a dream)" };
+
+        const Lyrics lyrics{ parseLyrics(is) };
+
+        EXPECT_EQ(lyrics.unsynchronizedLines.size(), 0);
+        ASSERT_EQ(lyrics.synchronizedLines.size(), 1);
+        EXPECT_EQ(lyrics.displayAlbum, "dqsxdkbu");
+        ASSERT_TRUE(lyrics.synchronizedLines.contains(9s + 160ms));
+        EXPECT_EQ(lyrics.synchronizedLines.find(9s + 160ms)->second, "I, I just woke up from a dream");
+    }
+
+    TEST(Lyrics, tagIDsWithSpaces)
+    {
+        std::istringstream is{ R"([  al   :    dqsxdkbu ]
+[00:09.16]I, I just woke up from a dream)" };
+
+        const Lyrics lyrics{ parseLyrics(is) };
+
+        EXPECT_EQ(lyrics.unsynchronizedLines.size(), 0);
+        ASSERT_EQ(lyrics.synchronizedLines.size(), 1);
+        EXPECT_EQ(lyrics.displayAlbum, "dqsxdkbu");
+        ASSERT_TRUE(lyrics.synchronizedLines.contains(9s + 160ms));
+        EXPECT_EQ(lyrics.synchronizedLines.find(9s + 160ms)->second, "I, I just woke up from a dream");
+    }
+
     TEST(Lyrics, tagAtTheEndOfLyrics)
     {
         std::istringstream is{ R"([00:03.30]Ooh, ooh