Function parseDateNotePattern

packages/app-core/src/lib/vault-layout.ts:224–265

(pattern: string)

  | { kind: 'token'; value: DateNotePatternToken }

function parseDateNotePattern(pattern: string): DateNotePatternPart[] {
  const parts: DateNotePatternPart[] = []
  let literal = ''
  let quoted = false

  const flushLiteral = (): void => {
    if (!literal) return
    parts.push({ kind: 'literal', value: literal })
    literal = ''
  }

  for (let i = 0; i < pattern.length; ) {
    const ch = pattern[i]
    if (ch === "'") {
      if (pattern[i + 1] === "'") {
        literal += "'"
        i += 2
        continue
      }
      quoted = !quoted
      i += 1
      continue
    }

    if (!quoted) {
      const token = DATE_NOTE_PATTERN_TOKENS.find((candidate) =>
        pattern.startsWith(candidate, i)
      )
      if (token) {
        flushLiteral()
        parts.push({ kind: 'token', value: token })
        i += token.length
        continue
      }
    }

    literal += ch
    i += 1
  }
  flushLiteral()
  return parts
}

function pad2(value: number): string {
  return String(value).padStart(2, '0')