FM / input

/usr/share/nodejs/codemirror/src/input

Name	Size	Mode	Actions
ContentEditableInput.js	19337	0644	edit dl rm
indent.js	2757	0644	edit dl rm
input.js	5548	0644	edit dl rm
keymap.js	6512	0644	edit dl rm
keynames.js	1014	0644	edit dl rm
movement.js	5090	0644	edit dl rm
TextareaInput.js	13921	0644	edit dl rm

Edit: /usr/share/nodejs/codemirror/src/input/movement.js (5090B)

import { Pos } from "../line/pos.js"
import { prepareMeasureForLine, measureCharPrepared, wrappedLineExtentChar } from "../measurement/position_measurement.js"
import { getBidiPartAt, getOrder } from "../util/bidi.js"
import { findFirst, lst, skipExtendingChars } from "../util/misc.js"

function moveCharLogically(line, ch, dir) {
  let target = skipExtendingChars(line.text, ch + dir, dir)
  return target < 0 || target > line.text.length ? null : target
}

export function moveLogically(line, start, dir) {
  let ch = moveCharLogically(line, start.ch, dir)
  return ch == null ? null : new Pos(start.line, ch, dir < 0 ? "after" : "before")
}

export function endOfLine(visually, cm, lineObj, lineNo, dir) {
  if (visually) {
    if (cm.doc.direction == "rtl") dir = -dir
    let order = getOrder(lineObj, cm.doc.direction)
    if (order) {
      let part = dir < 0 ? lst(order) : order[0]
      let moveInStorageOrder = (dir < 0) == (part.level == 1)
      let sticky = moveInStorageOrder ? "after" : "before"
      let ch
      // With a wrapped rtl chunk (possibly spanning multiple bidi parts),
      // it could be that the last bidi part is not on the last visual line,
      // since visual lines contain content order-consecutive chunks.
      // Thus, in rtl, we are looking for the first (content-order) character
      // in the rtl chunk that is on the last line (that is, the same line
      // as the last (content-order) character).
      if (part.level > 0 || cm.doc.direction == "rtl") {
        let prep = prepareMeasureForLine(cm, lineObj)
        ch = dir < 0 ? lineObj.text.length - 1 : 0
        let targetTop = measureCharPrepared(cm, prep, ch).top
        ch = findFirst(ch => measureCharPrepared(cm, prep, ch).top == targetTop, (dir < 0) == (part.level == 1) ? part.from : part.to - 1, ch)
        if (sticky == "before") ch = moveCharLogically(lineObj, ch, 1)
      } else ch = dir < 0 ? part.to : part.from
      return new Pos(lineNo, ch, sticky)
    }
  }
  return new Pos(lineNo, dir < 0 ? lineObj.text.length : 0, dir < 0 ? "before" : "after")
}

export function moveVisually(cm, line, start, dir) {
  let bidi = getOrder(line, cm.doc.direction)
  if (!bidi) return moveLogically(line, start, dir)
  if (start.ch >= line.text.length) {
    start.ch = line.text.length
    start.sticky = "before"
  } else if (start.ch <= 0) {
    start.ch = 0
    start.sticky = "after"
  }
  let partPos = getBidiPartAt(bidi, start.ch, start.sticky), part = bidi[partPos]
  if (cm.doc.direction == "ltr" && part.level % 2 == 0 && (dir > 0 ? part.to > start.ch : part.from < start.ch)) {
    // Case 1: We move within an ltr part in an ltr editor. Even with wrapped lines,
    // nothing interesting happens.
    return moveLogically(line, start, dir)
  }

let mv = (pos, dir) => moveCharLogically(line, pos instanceof Pos ? pos.ch : pos, dir)
  let prep
  let getWrappedLineExtent = ch => {
    if (!cm.options.lineWrapping) return {begin: 0, end: line.text.length}
    prep = prep || prepareMeasureForLine(cm, line)
    return wrappedLineExtentChar(cm, line, prep, ch)
  }
  let wrappedLineExtent = getWrappedLineExtent(start.sticky == "before" ? mv(start, -1) : start.ch)

if (cm.doc.direction == "rtl" || part.level == 1) {
    let moveInStorageOrder = (part.level == 1) == (dir < 0)
    let ch = mv(start, moveInStorageOrder ? 1 : -1)
    if (ch != null && (!moveInStorageOrder ? ch >= part.from && ch >= wrappedLineExtent.begin : ch <= part.to && ch <= wrappedLineExtent.end)) {
      // Case 2: We move within an rtl part or in an rtl editor on the same visual line
      let sticky = moveInStorageOrder ? "before" : "after"
      return new Pos(start.line, ch, sticky)
    }
  }

// Case 3: Could not move within this bidi part in this visual line, so leave
  // the current bidi part

let searchInVisualLine = (partPos, dir, wrappedLineExtent) => {
    let getRes = (ch, moveInStorageOrder) => moveInStorageOrder
      ? new Pos(start.line, mv(ch, 1), "before")
      : new Pos(start.line, ch, "after")

for (; partPos >= 0 && partPos < bidi.length; partPos += dir) {
      let part = bidi[partPos]
      let moveInStorageOrder = (dir > 0) == (part.level != 1)
      let ch = moveInStorageOrder ? wrappedLineExtent.begin : mv(wrappedLineExtent.end, -1)
      if (part.from <= ch && ch < part.to) return getRes(ch, moveInStorageOrder)
      ch = moveInStorageOrder ? part.from : mv(part.to, -1)
      if (wrappedLineExtent.begin <= ch && ch < wrappedLineExtent.end) return getRes(ch, moveInStorageOrder)
    }
  }

// Case 3a: Look for other bidi parts on the same visual line
  let res = searchInVisualLine(partPos + dir, dir, wrappedLineExtent)
  if (res) return res

// Case 3b: Look for other bidi parts on the next visual line
  let nextCh = dir > 0 ? wrappedLineExtent.end : mv(wrappedLineExtent.begin, -1)
  if (nextCh != null && !(dir > 0 && nextCh == line.text.length)) {
    res = searchInVisualLine(dir > 0 ? 0 : bidi.length - 1, dir, getWrappedLineExtent(nextCh))
    if (res) return res
  }

// Case 4: Nowhere to move
  return null
}

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