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