26 lines
1004 B
JavaScript
26 lines
1004 B
JavaScript
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/* PCO Plan — how a song key is written.
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Planning Center stores keys as typed: "Bb", "F#m", "Ab". Every tile in this
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module shows them as notes instead — B♭, F♯m, A♭ — so the plan, the badge
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on an item and the Song Key tile all agree. Shared rather than repeated
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because the day one of them changes, they all should. */
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/** "F#m" → { note: 'F', accidental: '♯', quality: 'm' }; anything odd → null. */
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export function parseKey(raw) {
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const match = /^([A-G])\s*([#b♯♭]?)\s*(.*)$/.exec(String(raw || '').trim());
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if (!match) return null;
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const [, note, accidental, quality] = match;
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return {
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note,
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accidental: accidental === '#' ? '♯' : accidental === 'b' ? '♭' : accidental,
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quality: quality.trim(),
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};
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}
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/** The same thing as one string, for a badge or a caption. */
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export function prettyKey(raw) {
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const parts = parseKey(raw);
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if (!parts) return String(raw || '').trim();
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return `${parts.note}${parts.accidental}${parts.quality}`;
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}
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