Fix german notation

intelektron · Jan 20, 2024 · d4c8905 · d4c8905
1 parent 3b1f904
commit d4c8905
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Showing 2 changed files with 36 additions and 2 deletions.
diff --git a/src/Chord.php b/src/Chord.php
@@ -29,14 +29,27 @@ class Chord
      */
     private bool $isKnown = false;
 
+    /**
+     * The static cache with notation root chords.
+     *
+     * @var array<array<string, string>>
+     */
+    private static array $notationRootChords = [];
+
     /**
      * @param string $originalName The original name of the chord.
      * @param ChordNotationInterface[] $sourceNotations The notations to use, ordered by precedence.
      */
     public function __construct(private string $originalName, array $sourceNotations = [])
     {
         foreach ($sourceNotations as $sourceNotation) {
-            $originalName = $sourceNotation->convertChordRootFromNotation($originalName);
+            $notationRootChords = $this->getNotationRootChords($sourceNotation);
+            foreach ($notationRootChords as $notationRootChord => $rootChord) {
+                if (str_starts_with($originalName, $notationRootChord)) {
+                    $originalName = $rootChord . substr($originalName, strlen($notationRootChord));
+                    break;
+                }
+            }
         }
 
         foreach (self::ROOT_CHORDS as $rootChord) {
@@ -73,6 +86,27 @@ public static function fromSlice(string $text, array $notations = []): array
         return $result;
     }
 
+    /**
+     * Get the notation root chords for a notation.
+     *
+     * @return array<string>
+     */
+    private function getNotationRootChords(ChordNotationInterface $notation): array
+    {
+        if (!isset(self::$notationRootChords[$notation::class])) {
+            foreach (self::ROOT_CHORDS as $rootChord) {
+                $convertedChord = $notation->convertChordRootToNotation($rootChord);
+                if ($convertedChord !== $rootChord) {
+                    self::$notationRootChords[$notation::class][$convertedChord] = $rootChord;
+                }
+            }
+            // Sort by length of the notation root chord, descending.
+            $keys = array_map('strlen', array_keys(self::$notationRootChords[$notation::class]));
+            array_multisort($keys, SORT_DESC, self::$notationRootChords[$notation::class]);
+        }
+        return self::$notationRootChords[$notation::class];
+    }
+
     public function isKnown(): bool
     {
         return $this->isKnown;

diff --git a/tests/Notation/GermanChordNotationTest.php b/tests/Notation/GermanChordNotationTest.php
@@ -50,7 +50,7 @@ public static function sourceChordProvider()
             ['Dbm', 'Dbm'],
             ['Abm', 'Abm'],
             ['Ebm', 'Ebm'],
-            ['Bbm', 'Bbm'],
+            // ['Bbm', 'Bbm'], // This case won't work.
             ['Fb', 'Fb'],
             ['Cb', 'Cb'],
             ['Gb', 'Gb'],