Function appendBreakableSegmentFrom

src/line-break.ts:370–415

(segmentIndex: number, startGraphemeIndex: number)

  }

  function appendBreakableSegmentFrom(segmentIndex: number, startGraphemeIndex: number): void {
    const fitAdvances = breakableFitAdvances[segmentIndex]!
    const preferredBreaks = breakablePreferredBreaks[segmentIndex] ?? null
    let preferredBreakIndex = preferredBreaks === null
      ? -1
      : getNextPreferredBreakIndex(preferredBreaks, 0, startGraphemeIndex + 1)
    let lastPreferredBreakEnd = -1
    let lastPreferredBreakWidth = 0

    let g = startGraphemeIndex
    while (g < fitAdvances.length) {
      const gw = fitAdvances[g]!

      if (!hasContent) {
        startLineAtGrapheme(segmentIndex, g, gw)
      } else if (lineW + gw > fitLimit) {
        if (preferredBreaks !== null && lastPreferredBreakEnd > startGraphemeIndex) {
          emitCurrentLine(segmentIndex, lastPreferredBreakEnd, lastPreferredBreakWidth)
          g = lastPreferredBreakEnd
          preferredBreakIndex = getNextPreferredBreakIndex(preferredBreaks, preferredBreakIndex, g + 1)
          lastPreferredBreakEnd = -1
          lastPreferredBreakWidth = 0
          continue
        }
        emitCurrentLine()
        startLineAtGrapheme(segmentIndex, g, gw)
      } else {
        lineW += gw
        lineEndSegmentIndex = segmentIndex
        lineEndGraphemeIndex = g + 1
      }

      const graphemeEnd = g + 1
      if (preferredBreaks !== null && preferredBreaks[preferredBreakIndex] === graphemeEnd) {
        lastPreferredBreakEnd = graphemeEnd
        lastPreferredBreakWidth = lineW
        preferredBreakIndex++
      }
      g++
    }

    if (hasContent && lineEndSegmentIndex === segmentIndex && lineEndGraphemeIndex === fitAdvances.length) {
      lineEndSegmentIndex = segmentIndex + 1
      lineEndGraphemeIndex = 0
    }
  }

  let i = 0
  while (i < widths.length) {