Function isPercentContent

packages/convert/src/format-detection.ts:53–82

(content: string)

/** Check if file content is percent format */
export function isPercentContent(content: string): boolean {
  // Percent format files have '# %%' cell markers at the start of lines
  // We need to check that the marker is not inside a triple-quoted string
  // (e.g., module docstrings at the beginning of the file)
  const lines = content.split('\n')
  let inTripleQuote = false
  let quoteChar = ''

  for (const line of lines) {
    // Check for triple quote toggles
    for (const q of ['"""', "'''"]) {
      let idx = line.indexOf(q, 0)
      while (idx !== -1) {
        if (!inTripleQuote) {
          inTripleQuote = true
          quoteChar = q
        } else if (quoteChar === q) {
          inTripleQuote = false
        }
        idx = line.indexOf(q, idx + 3)
      }
    }

    // Check for cell marker outside triple quotes
    if (!inTripleQuote && /^# %%/.test(line)) {
      return true
    }
  }
  return false
}

/**
 * Detects the notebook format from filename and optionally content.