openrat-cms

movement.min.js (5044B)

---

 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) {
     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
 }