62 lines
2.2 KiB
JavaScript
62 lines
2.2 KiB
JavaScript
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import { cmp, Pos } from "../line/pos.js"
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import { lst } from "../util/misc.js"
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import { normalizeSelection, Range, Selection } from "./selection.js"
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// Compute the position of the end of a change (its 'to' property
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// refers to the pre-change end).
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export function changeEnd(change) {
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if (!change.text) return change.to
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return Pos(change.from.line + change.text.length - 1,
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lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0))
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}
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// Adjust a position to refer to the post-change position of the
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// same text, or the end of the change if the change covers it.
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function adjustForChange(pos, change) {
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if (cmp(pos, change.from) < 0) return pos
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if (cmp(pos, change.to) <= 0) return changeEnd(change)
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let line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch
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if (pos.line == change.to.line) ch += changeEnd(change).ch - change.to.ch
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return Pos(line, ch)
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}
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export function computeSelAfterChange(doc, change) {
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let out = []
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for (let i = 0; i < doc.sel.ranges.length; i++) {
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let range = doc.sel.ranges[i]
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out.push(new Range(adjustForChange(range.anchor, change),
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adjustForChange(range.head, change)))
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}
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return normalizeSelection(doc.cm, out, doc.sel.primIndex)
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}
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function offsetPos(pos, old, nw) {
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if (pos.line == old.line)
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return Pos(nw.line, pos.ch - old.ch + nw.ch)
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else
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return Pos(nw.line + (pos.line - old.line), pos.ch)
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}
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// Used by replaceSelections to allow moving the selection to the
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// start or around the replaced test. Hint may be "start" or "around".
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export function computeReplacedSel(doc, changes, hint) {
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let out = []
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let oldPrev = Pos(doc.first, 0), newPrev = oldPrev
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for (let i = 0; i < changes.length; i++) {
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let change = changes[i]
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let from = offsetPos(change.from, oldPrev, newPrev)
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let to = offsetPos(changeEnd(change), oldPrev, newPrev)
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oldPrev = change.to
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newPrev = to
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if (hint == "around") {
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let range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0
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out[i] = new Range(inv ? to : from, inv ? from : to)
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} else {
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out[i] = new Range(from, from)
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}
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}
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return new Selection(out, doc.sel.primIndex)
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}
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