import { retreatFrontier } from "../line/highlight.js"
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import { startWorker } from "../display/highlight_worker.js"
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import { operation } from "../display/operations.js"
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import { regChange, regLineChange } from "../display/view_tracking.js"
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import { clipLine, clipPos, cmp, Pos } from "../line/pos.js"
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import { sawReadOnlySpans } from "../line/saw_special_spans.js"
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import { lineLength, removeReadOnlyRanges, stretchSpansOverChange, visualLine } from "../line/spans.js"
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import { getBetween, getLine, lineNo } from "../line/utils_line.js"
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import { estimateHeight } from "../measurement/position_measurement.js"
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import { hasHandler, signal, signalCursorActivity } from "../util/event.js"
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import { indexOf, lst, map, sel_dontScroll } from "../util/misc.js"
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import { signalLater } from "../util/operation_group.js"
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import { changeEnd, computeSelAfterChange } from "./change_measurement.js"
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import { isWholeLineUpdate, linkedDocs, updateDoc } from "./document_data.js"
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import { addChangeToHistory, historyChangeFromChange, mergeOldSpans, pushSelectionToHistory } from "./history.js"
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import { Range, Selection } from "./selection.js"
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import { setSelection, setSelectionNoUndo } from "./selection_updates.js"
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// UPDATING
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// Allow "beforeChange" event handlers to influence a change
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function filterChange(doc, change, update) {
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let obj = {
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canceled: false,
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from: change.from,
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to: change.to,
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text: change.text,
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origin: change.origin,
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cancel: () => obj.canceled = true
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}
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if (update) obj.update = (from, to, text, origin) => {
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if (from) obj.from = clipPos(doc, from)
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if (to) obj.to = clipPos(doc, to)
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if (text) obj.text = text
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if (origin !== undefined) obj.origin = origin
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}
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signal(doc, "beforeChange", doc, obj)
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if (doc.cm) signal(doc.cm, "beforeChange", doc.cm, obj)
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if (obj.canceled) {
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if (doc.cm) doc.cm.curOp.updateInput = 2
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return null
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}
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return {from: obj.from, to: obj.to, text: obj.text, origin: obj.origin}
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}
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// Apply a change to a document, and add it to the document's
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// history, and propagating it to all linked documents.
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export function makeChange(doc, change, ignoreReadOnly) {
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if (doc.cm) {
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if (!doc.cm.curOp) return operation(doc.cm, makeChange)(doc, change, ignoreReadOnly)
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if (doc.cm.state.suppressEdits) return
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}
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if (hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")) {
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change = filterChange(doc, change, true)
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if (!change) return
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}
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// Possibly split or suppress the update based on the presence
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// of read-only spans in its range.
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let split = sawReadOnlySpans && !ignoreReadOnly && removeReadOnlyRanges(doc, change.from, change.to)
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if (split) {
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for (let i = split.length - 1; i >= 0; --i)
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makeChangeInner(doc, {from: split[i].from, to: split[i].to, text: i ? [""] : change.text, origin: change.origin})
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} else {
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makeChangeInner(doc, change)
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}
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}
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function makeChangeInner(doc, change) {
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if (change.text.length == 1 && change.text[0] == "" && cmp(change.from, change.to) == 0) return
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let selAfter = computeSelAfterChange(doc, change)
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addChangeToHistory(doc, change, selAfter, doc.cm ? doc.cm.curOp.id : NaN)
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makeChangeSingleDoc(doc, change, selAfter, stretchSpansOverChange(doc, change))
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let rebased = []
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linkedDocs(doc, (doc, sharedHist) => {
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if (!sharedHist && indexOf(rebased, doc.history) == -1) {
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rebaseHist(doc.history, change)
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rebased.push(doc.history)
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}
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makeChangeSingleDoc(doc, change, null, stretchSpansOverChange(doc, change))
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})
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}
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// Revert a change stored in a document's history.
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export function makeChangeFromHistory(doc, type, allowSelectionOnly) {
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let suppress = doc.cm && doc.cm.state.suppressEdits
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if (suppress && !allowSelectionOnly) return
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let hist = doc.history, event, selAfter = doc.sel
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let source = type == "undo" ? hist.done : hist.undone, dest = type == "undo" ? hist.undone : hist.done
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// Verify that there is a useable event (so that ctrl-z won't
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// needlessly clear selection events)
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let i = 0
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for (; i < source.length; i++) {
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event = source[i]
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if (allowSelectionOnly ? event.ranges && !event.equals(doc.sel) : !event.ranges)
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break
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}
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if (i == source.length) return
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hist.lastOrigin = hist.lastSelOrigin = null
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for (;;) {
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event = source.pop()
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if (event.ranges) {
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pushSelectionToHistory(event, dest)
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if (allowSelectionOnly && !event.equals(doc.sel)) {
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setSelection(doc, event, {clearRedo: false})
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return
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}
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selAfter = event
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} else if (suppress) {
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source.push(event)
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return
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} else break
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}
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// Build up a reverse change object to add to the opposite history
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// stack (redo when undoing, and vice versa).
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let antiChanges = []
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pushSelectionToHistory(selAfter, dest)
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dest.push({changes: antiChanges, generation: hist.generation})
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hist.generation = event.generation || ++hist.maxGeneration
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let filter = hasHandler(doc, "beforeChange") || doc.cm && hasHandler(doc.cm, "beforeChange")
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for (let i = event.changes.length - 1; i >= 0; --i) {
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let change = event.changes[i]
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change.origin = type
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if (filter && !filterChange(doc, change, false)) {
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source.length = 0
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return
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}
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antiChanges.push(historyChangeFromChange(doc, change))
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let after = i ? computeSelAfterChange(doc, change) : lst(source)
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makeChangeSingleDoc(doc, change, after, mergeOldSpans(doc, change))
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if (!i && doc.cm) doc.cm.scrollIntoView({from: change.from, to: changeEnd(change)})
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let rebased = []
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// Propagate to the linked documents
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linkedDocs(doc, (doc, sharedHist) => {
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if (!sharedHist && indexOf(rebased, doc.history) == -1) {
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rebaseHist(doc.history, change)
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rebased.push(doc.history)
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}
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makeChangeSingleDoc(doc, change, null, mergeOldSpans(doc, change))
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})
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}
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}
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// Sub-views need their line numbers shifted when text is added
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// above or below them in the parent document.
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function shiftDoc(doc, distance) {
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if (distance == 0) return
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doc.first += distance
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doc.sel = new Selection(map(doc.sel.ranges, range => new Range(
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Pos(range.anchor.line + distance, range.anchor.ch),
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Pos(range.head.line + distance, range.head.ch)
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)), doc.sel.primIndex)
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if (doc.cm) {
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regChange(doc.cm, doc.first, doc.first - distance, distance)
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for (let d = doc.cm.display, l = d.viewFrom; l < d.viewTo; l++)
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regLineChange(doc.cm, l, "gutter")
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}
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}
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// More lower-level change function, handling only a single document
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// (not linked ones).
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function makeChangeSingleDoc(doc, change, selAfter, spans) {
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if (doc.cm && !doc.cm.curOp)
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return operation(doc.cm, makeChangeSingleDoc)(doc, change, selAfter, spans)
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if (change.to.line < doc.first) {
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shiftDoc(doc, change.text.length - 1 - (change.to.line - change.from.line))
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return
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}
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if (change.from.line > doc.lastLine()) return
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// Clip the change to the size of this doc
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if (change.from.line < doc.first) {
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let shift = change.text.length - 1 - (doc.first - change.from.line)
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shiftDoc(doc, shift)
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change = {from: Pos(doc.first, 0), to: Pos(change.to.line + shift, change.to.ch),
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text: [lst(change.text)], origin: change.origin}
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}
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let last = doc.lastLine()
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if (change.to.line > last) {
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change = {from: change.from, to: Pos(last, getLine(doc, last).text.length),
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text: [change.text[0]], origin: change.origin}
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}
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change.removed = getBetween(doc, change.from, change.to)
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if (!selAfter) selAfter = computeSelAfterChange(doc, change)
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if (doc.cm) makeChangeSingleDocInEditor(doc.cm, change, spans)
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else updateDoc(doc, change, spans)
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setSelectionNoUndo(doc, selAfter, sel_dontScroll)
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}
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// Handle the interaction of a change to a document with the editor
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// that this document is part of.
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function makeChangeSingleDocInEditor(cm, change, spans) {
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let doc = cm.doc, display = cm.display, from = change.from, to = change.to
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let recomputeMaxLength = false, checkWidthStart = from.line
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if (!cm.options.lineWrapping) {
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checkWidthStart = lineNo(visualLine(getLine(doc, from.line)))
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doc.iter(checkWidthStart, to.line + 1, line => {
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if (line == display.maxLine) {
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recomputeMaxLength = true
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return true
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}
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})
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}
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if (doc.sel.contains(change.from, change.to) > -1)
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signalCursorActivity(cm)
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updateDoc(doc, change, spans, estimateHeight(cm))
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if (!cm.options.lineWrapping) {
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doc.iter(checkWidthStart, from.line + change.text.length, line => {
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let len = lineLength(line)
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if (len > display.maxLineLength) {
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display.maxLine = line
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display.maxLineLength = len
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display.maxLineChanged = true
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recomputeMaxLength = false
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}
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})
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if (recomputeMaxLength) cm.curOp.updateMaxLine = true
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}
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retreatFrontier(doc, from.line)
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startWorker(cm, 400)
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let lendiff = change.text.length - (to.line - from.line) - 1
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// Remember that these lines changed, for updating the display
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if (change.full)
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regChange(cm)
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else if (from.line == to.line && change.text.length == 1 && !isWholeLineUpdate(cm.doc, change))
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regLineChange(cm, from.line, "text")
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else
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regChange(cm, from.line, to.line + 1, lendiff)
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let changesHandler = hasHandler(cm, "changes"), changeHandler = hasHandler(cm, "change")
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if (changeHandler || changesHandler) {
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let obj = {
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from: from, to: to,
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text: change.text,
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removed: change.removed,
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origin: change.origin
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}
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if (changeHandler) signalLater(cm, "change", cm, obj)
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if (changesHandler) (cm.curOp.changeObjs || (cm.curOp.changeObjs = [])).push(obj)
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}
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cm.display.selForContextMenu = null
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}
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export function replaceRange(doc, code, from, to, origin) {
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if (!to) to = from
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if (cmp(to, from) < 0) [from, to] = [to, from]
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if (typeof code == "string") code = doc.splitLines(code)
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makeChange(doc, {from, to, text: code, origin})
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}
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// Rebasing/resetting history to deal with externally-sourced changes
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function rebaseHistSelSingle(pos, from, to, diff) {
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if (to < pos.line) {
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pos.line += diff
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} else if (from < pos.line) {
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pos.line = from
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pos.ch = 0
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}
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}
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// Tries to rebase an array of history events given a change in the
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// document. If the change touches the same lines as the event, the
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// event, and everything 'behind' it, is discarded. If the change is
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// before the event, the event's positions are updated. Uses a
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// copy-on-write scheme for the positions, to avoid having to
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// reallocate them all on every rebase, but also avoid problems with
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// shared position objects being unsafely updated.
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function rebaseHistArray(array, from, to, diff) {
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for (let i = 0; i < array.length; ++i) {
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let sub = array[i], ok = true
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if (sub.ranges) {
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if (!sub.copied) { sub = array[i] = sub.deepCopy(); sub.copied = true }
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for (let j = 0; j < sub.ranges.length; j++) {
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rebaseHistSelSingle(sub.ranges[j].anchor, from, to, diff)
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rebaseHistSelSingle(sub.ranges[j].head, from, to, diff)
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}
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continue
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}
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for (let j = 0; j < sub.changes.length; ++j) {
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let cur = sub.changes[j]
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if (to < cur.from.line) {
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cur.from = Pos(cur.from.line + diff, cur.from.ch)
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cur.to = Pos(cur.to.line + diff, cur.to.ch)
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} else if (from <= cur.to.line) {
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ok = false
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break
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}
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}
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if (!ok) {
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array.splice(0, i + 1)
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i = 0
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}
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}
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}
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function rebaseHist(hist, change) {
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let from = change.from.line, to = change.to.line, diff = change.text.length - (to - from) - 1
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rebaseHistArray(hist.done, from, to, diff)
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rebaseHistArray(hist.undone, from, to, diff)
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}
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// Utility for applying a change to a line by handle or number,
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// returning the number and optionally registering the line as
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// changed.
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export function changeLine(doc, handle, changeType, op) {
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let no = handle, line = handle
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if (typeof handle == "number") line = getLine(doc, clipLine(doc, handle))
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else no = lineNo(handle)
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if (no == null) return null
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if (op(line, no) && doc.cm) regLineChange(doc.cm, no, changeType)
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return line
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}
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