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comparison .cms/lib/codemirror/src/model/history.js @ 0:78edf6b517a0 draft

24.10

author	Coffee CMS <info@coffee-cms.ru>
date	Fri, 11 Oct 2024 22:40:23 +0000
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--1:000000000000
+:78edf6b517a0
+import { cmp, copyPos } from "../line/pos.js"
+import { stretchSpansOverChange } from "../line/spans.js"
+import { getBetween } from "../line/utils_line.js"
+import { signal } from "../util/event.js"
+import { indexOf, lst } from "../util/misc.js"
+import { changeEnd } from "./change_measurement.js"
+import { linkedDocs } from "./document_data.js"
+import { Selection } from "./selection.js"
+export function History(prev) {
+// Arrays of change events and selections. Doing something adds an
+// event to done and clears undo. Undoing moves events from done
+// to undone, redoing moves them in the other direction.
+this.done = []; this.undone = []
+this.undoDepth = prev ? prev.undoDepth : Infinity
+// Used to track when changes can be merged into a single undo
+// event
+this.lastModTime = this.lastSelTime = 0
+this.lastOp = this.lastSelOp = null
+this.lastOrigin = this.lastSelOrigin = null
+// Used by the isClean() method
+this.generation = this.maxGeneration = prev ? prev.maxGeneration : 1
+}
+// Create a history change event from an updateDoc-style change
+// object.
+export function historyChangeFromChange(doc, change) {
+let histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)}
+attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1)
+linkedDocs(doc, doc => attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1), true)
+return histChange
+}
+// Pop all selection events off the end of a history array. Stop at
+// a change event.
+function clearSelectionEvents(array) {
+while (array.length) {
+let last = lst(array)
+if (last.ranges) array.pop()
+else break
+}
+}
+// Find the top change event in the history. Pop off selection
+// events that are in the way.
+function lastChangeEvent(hist, force) {
+if (force) {
+clearSelectionEvents(hist.done)
+return lst(hist.done)
+} else if (hist.done.length && !lst(hist.done).ranges) {
+return lst(hist.done)
+} else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
+hist.done.pop()
+return lst(hist.done)
+}
+}
+// Register a change in the history. Merges changes that are within
+// a single operation, or are close together with an origin that
+// allows merging (starting with "+") into a single event.
+export function addChangeToHistory(doc, change, selAfter, opId) {
+let hist = doc.history
+hist.undone.length = 0
+let time = +new Date, cur
+let last
+if ((hist.lastOp == opId ||
+hist.lastOrigin == change.origin && change.origin &&
+((change.origin.charAt(0) == "+" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
+change.origin.charAt(0) == "*")) &&
+(cur = lastChangeEvent(hist, hist.lastOp == opId))) {
+// Merge this change into the last event
+last = lst(cur.changes)
+if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
+// Optimized case for simple insertion -- don't want to add
+// new changesets for every character typed
+last.to = changeEnd(change)
+} else {
+// Add new sub-event
+cur.changes.push(historyChangeFromChange(doc, change))
+}
+} else {
+// Can not be merged, start a new event.
+let before = lst(hist.done)
+if (!before || !before.ranges)
+pushSelectionToHistory(doc.sel, hist.done)
+cur = {changes: [historyChangeFromChange(doc, change)],
+generation: hist.generation}
+hist.done.push(cur)
+while (hist.done.length > hist.undoDepth) {
+hist.done.shift()
+if (!hist.done[0].ranges) hist.done.shift()
+}
+}
+hist.done.push(selAfter)
+hist.generation = ++hist.maxGeneration
+hist.lastModTime = hist.lastSelTime = time
+hist.lastOp = hist.lastSelOp = opId
+hist.lastOrigin = hist.lastSelOrigin = change.origin
+if (!last) signal(doc, "historyAdded")
+}
+function selectionEventCanBeMerged(doc, origin, prev, sel) {
+let ch = origin.charAt(0)
+return ch == "*" ||
+ch == "+" &&
+prev.ranges.length == sel.ranges.length &&
+prev.somethingSelected() == sel.somethingSelected() &&
+new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
+}
+// Called whenever the selection changes, sets the new selection as
+// the pending selection in the history, and pushes the old pending
+// selection into the 'done' array when it was significantly
+// different (in number of selected ranges, emptiness, or time).
+export function addSelectionToHistory(doc, sel, opId, options) {
+let hist = doc.history, origin = options && options.origin
+// A new event is started when the previous origin does not match
+// the current, or the origins don't allow matching. Origins
+// starting with * are always merged, those starting with + are
+// merged when similar and close together in time.
+if (opId == hist.lastSelOp ||
+(origin && hist.lastSelOrigin == origin &&
+(hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
+selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
+hist.done[hist.done.length - 1] = sel
+else
+pushSelectionToHistory(sel, hist.done)
+hist.lastSelTime = +new Date
+hist.lastSelOrigin = origin
+hist.lastSelOp = opId
+if (options && options.clearRedo !== false)
+clearSelectionEvents(hist.undone)
+}
+export function pushSelectionToHistory(sel, dest) {
+let top = lst(dest)
+if (!(top && top.ranges && top.equals(sel)))
+dest.push(sel)
+}
+// Used to store marked span information in the history.
+function attachLocalSpans(doc, change, from, to) {
+let existing = change["spans_" + doc.id], n = 0
+doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), line => {
+if (line.markedSpans)
+(existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans
+++n
+})
+}
+// When un/re-doing restores text containing marked spans, those
+// that have been explicitly cleared should not be restored.
+function removeClearedSpans(spans) {
+if (!spans) return null
+let out
+for (let i = 0; i < spans.length; ++i) {
+if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i) }
+else if (out) out.push(spans[i])
+}
+return !out ? spans : out.length ? out : null
+}
+// Retrieve and filter the old marked spans stored in a change event.
+function getOldSpans(doc, change) {
+let found = change["spans_" + doc.id]
+if (!found) return null
+let nw = []
+for (let i = 0; i < change.text.length; ++i)
+nw.push(removeClearedSpans(found[i]))
+return nw
+}
+// Used for un/re-doing changes from the history. Combines the
+// result of computing the existing spans with the set of spans that
+// existed in the history (so that deleting around a span and then
+// undoing brings back the span).
+export function mergeOldSpans(doc, change) {
+let old = getOldSpans(doc, change)
+let stretched = stretchSpansOverChange(doc, change)
+if (!old) return stretched
+if (!stretched) return old
+for (let i = 0; i < old.length; ++i) {
+let oldCur = old[i], stretchCur = stretched[i]
+if (oldCur && stretchCur) {
+spans: for (let j = 0; j < stretchCur.length; ++j) {
+let span = stretchCur[j]
+for (let k = 0; k < oldCur.length; ++k)
+if (oldCur[k].marker == span.marker) continue spans
+oldCur.push(span)
+}
+} else if (stretchCur) {
+old[i] = stretchCur
+}
+}
+return old
+}
+// Used both to provide a JSON-safe object in .getHistory, and, when
+// detaching a document, to split the history in two
+export function copyHistoryArray(events, newGroup, instantiateSel) {
+let copy = []
+for (let i = 0; i < events.length; ++i) {
+let event = events[i]
+if (event.ranges) {
+copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event)
+continue
+}
+let changes = event.changes, newChanges = []
+copy.push({changes: newChanges})
+for (let j = 0; j < changes.length; ++j) {
+let change = changes[j], m
+newChanges.push({from: change.from, to: change.to, text: change.text})
+if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {
+if (indexOf(newGroup, Number(m[1])) > -1) {
+lst(newChanges)[prop] = change[prop]
+delete change[prop]
+}
+}
+}
+}
+return copy
+}