Mercurial
diff .cms/lib/codemirror/src/model/change_measurement.js @ 0:78edf6b517a0 draft
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author | Coffee CMS <info@coffee-cms.ru> |
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date | Fri, 11 Oct 2024 22:40:23 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/.cms/lib/codemirror/src/model/change_measurement.js Fri Oct 11 22:40:23 2024 +0000 @@ -0,0 +1,61 @@ +import { cmp, Pos } from "../line/pos.js" +import { lst } from "../util/misc.js" + +import { normalizeSelection, Range, Selection } from "./selection.js" + +// Compute the position of the end of a change (its 'to' property +// refers to the pre-change end). +export function changeEnd(change) { + if (!change.text) return change.to + return Pos(change.from.line + change.text.length - 1, + lst(change.text).length + (change.text.length == 1 ? change.from.ch : 0)) +} + +// Adjust a position to refer to the post-change position of the +// same text, or the end of the change if the change covers it. +function adjustForChange(pos, change) { + if (cmp(pos, change.from) < 0) return pos + if (cmp(pos, change.to) <= 0) return changeEnd(change) + + let line = pos.line + change.text.length - (change.to.line - change.from.line) - 1, ch = pos.ch + if (pos.line == change.to.line) ch += changeEnd(change).ch - change.to.ch + return Pos(line, ch) +} + +export function computeSelAfterChange(doc, change) { + let out = [] + for (let i = 0; i < doc.sel.ranges.length; i++) { + let range = doc.sel.ranges[i] + out.push(new Range(adjustForChange(range.anchor, change), + adjustForChange(range.head, change))) + } + return normalizeSelection(doc.cm, out, doc.sel.primIndex) +} + +function offsetPos(pos, old, nw) { + if (pos.line == old.line) + return Pos(nw.line, pos.ch - old.ch + nw.ch) + else + return Pos(nw.line + (pos.line - old.line), pos.ch) +} + +// Used by replaceSelections to allow moving the selection to the +// start or around the replaced test. Hint may be "start" or "around". +export function computeReplacedSel(doc, changes, hint) { + let out = [] + let oldPrev = Pos(doc.first, 0), newPrev = oldPrev + for (let i = 0; i < changes.length; i++) { + let change = changes[i] + let from = offsetPos(change.from, oldPrev, newPrev) + let to = offsetPos(changeEnd(change), oldPrev, newPrev) + oldPrev = change.to + newPrev = to + if (hint == "around") { + let range = doc.sel.ranges[i], inv = cmp(range.head, range.anchor) < 0 + out[i] = new Range(inv ? to : from, inv ? from : to) + } else { + out[i] = new Range(from, from) + } + } + return new Selection(out, doc.sel.primIndex) +}