Function segmentPrintableGraphemes

src/ink/termio/parser.ts:98–121

(str: string)

}

function* segmentPrintableGraphemes(str: string): Generator<Grapheme> {
  // Long-history transcript output is overwhelmingly ASCII source text.
  // Bypass Intl.Segmenter on that path: every code unit is already one
  // grapheme of width 1, and the fallback path still handles emoji / wide
  // / multi-codepoint clusters exactly as before.
  let asciiOnly = true
  for (let index = 0; index < str.length; index++) {
    if (str.charCodeAt(index) > 0x7f) {
      asciiOnly = false
      break
    }
  }

  if (asciiOnly) {
    for (let index = 0; index < str.length; index++) {
      yield { value: str[index]!, width: 1 }
    }
    return
  }

  for (const { segment } of getGraphemeSegmenter().segment(str)) {
    yield { value: segment, width: graphemeWidth(segment) }
  }
}

// =============================================================================
// Sequence Parsing