openrat-cms

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change_measurement.min.js (2221B)

      1 import { cmp, Pos } from "../line/pos.js"
      2 import { lst } from "../util/misc.js"
      3 
      4 import { normalizeSelection, Range, Selection } from "./selection.js"
      5 
      6 // Compute the position of the end of a change (its 'to' property
      7 // refers to the pre-change end).
      8 export function changeEnd(change) {
      9   if (!change.text) return change.to
     10   return Pos(change.from.line + change.text.length - 1,
     11              lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
     12 }
     13 
     14 // Adjust a position to refer to the post-change position of the
     15 // same text, or the end of the change if the change covers it.
     16 function adjustForChange(pos, change) {
     17   if (cmp(pos, change.from) < 0) return pos
     18   if (cmp(pos, change.to) <= 0) return changeEnd(change)
     19 
     20   let line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch
     21   if (pos.line == change.to.line) ch += changeEnd(change).ch - change.to.ch
     22   return Pos(line, ch)
     23 }
     24 
     25 export function computeSelAfterChange(doc, change) {
     26   let out = []
     27   for (let i = 0; i < doc.sel.ranges.length; i++) {
     28     let range = doc.sel.ranges[i]
     29     out.push(new Range(adjustForChange(range.anchor, change),
     30                        adjustForChange(range.head, change)))
     31   }
     32   return normalizeSelection(out, doc.sel.primIndex)
     33 }
     34 
     35 function offsetPos(pos, old, nw) {
     36   if (pos.line == old.line)
     37     return Pos(nw.line, pos.ch - old.ch + nw.ch)
     38   else
     39     return Pos(nw.line + (pos.line - old.line), pos.ch)
     40 }
     41 
     42 // Used by replaceSelections to allow moving the selection to the
     43 // start or around the replaced test. Hint may be "start" or "around".
     44 export function computeReplacedSel(doc, changes, hint) {
     45   let out = []
     46   let oldPrev = Pos(doc.first, 0), newPrev = oldPrev
     47   for (let i = 0; i < changes.length; i++) {
     48     let change = changes[i]
     49     let from = offsetPos(change.from, oldPrev, newPrev)
     50     let to = offsetPos(changeEnd(change), oldPrev, newPrev)
     51     oldPrev = change.to
     52     newPrev = to
     53     if (hint == "around") {
     54       let range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0
     55       out[i] = new Range(inv ? to : from, inv ? from : to)
     56     } else {
     57       out[i] = new Range(from, from)
     58     }
     59   }
     60   return new Selection(out, doc.sel.primIndex)
     61 }