0
|
1 import { cmp, copyPos } from "../line/pos.js"
|
|
2 import { stretchSpansOverChange } from "../line/spans.js"
|
|
3 import { getBetween } from "../line/utils_line.js"
|
|
4 import { signal } from "../util/event.js"
|
|
5 import { indexOf, lst } from "../util/misc.js"
|
|
6
|
|
7 import { changeEnd } from "./change_measurement.js"
|
|
8 import { linkedDocs } from "./document_data.js"
|
|
9 import { Selection } from "./selection.js"
|
|
10
|
|
11 export function History(prev) {
|
|
12 // Arrays of change events and selections. Doing something adds an
|
|
13 // event to done and clears undo. Undoing moves events from done
|
|
14 // to undone, redoing moves them in the other direction.
|
|
15 this.done = []; this.undone = []
|
|
16 this.undoDepth = prev ? prev.undoDepth : Infinity
|
|
17 // Used to track when changes can be merged into a single undo
|
|
18 // event
|
|
19 this.lastModTime = this.lastSelTime = 0
|
|
20 this.lastOp = this.lastSelOp = null
|
|
21 this.lastOrigin = this.lastSelOrigin = null
|
|
22 // Used by the isClean() method
|
|
23 this.generation = this.maxGeneration = prev ? prev.maxGeneration : 1
|
|
24 }
|
|
25
|
|
26 // Create a history change event from an updateDoc-style change
|
|
27 // object.
|
|
28 export function historyChangeFromChange(doc, change) {
|
|
29 let histChange = {from: copyPos(change.from), to: changeEnd(change), text: getBetween(doc, change.from, change.to)}
|
|
30 attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1)
|
|
31 linkedDocs(doc, doc => attachLocalSpans(doc, histChange, change.from.line, change.to.line + 1), true)
|
|
32 return histChange
|
|
33 }
|
|
34
|
|
35 // Pop all selection events off the end of a history array. Stop at
|
|
36 // a change event.
|
|
37 function clearSelectionEvents(array) {
|
|
38 while (array.length) {
|
|
39 let last = lst(array)
|
|
40 if (last.ranges) array.pop()
|
|
41 else break
|
|
42 }
|
|
43 }
|
|
44
|
|
45 // Find the top change event in the history. Pop off selection
|
|
46 // events that are in the way.
|
|
47 function lastChangeEvent(hist, force) {
|
|
48 if (force) {
|
|
49 clearSelectionEvents(hist.done)
|
|
50 return lst(hist.done)
|
|
51 } else if (hist.done.length && !lst(hist.done).ranges) {
|
|
52 return lst(hist.done)
|
|
53 } else if (hist.done.length > 1 && !hist.done[hist.done.length - 2].ranges) {
|
|
54 hist.done.pop()
|
|
55 return lst(hist.done)
|
|
56 }
|
|
57 }
|
|
58
|
|
59 // Register a change in the history. Merges changes that are within
|
|
60 // a single operation, or are close together with an origin that
|
|
61 // allows merging (starting with "+") into a single event.
|
|
62 export function addChangeToHistory(doc, change, selAfter, opId) {
|
|
63 let hist = doc.history
|
|
64 hist.undone.length = 0
|
|
65 let time = +new Date, cur
|
|
66 let last
|
|
67
|
|
68 if ((hist.lastOp == opId ||
|
|
69 hist.lastOrigin == change.origin && change.origin &&
|
|
70 ((change.origin.charAt(0) == "+" && hist.lastModTime > time - (doc.cm ? doc.cm.options.historyEventDelay : 500)) ||
|
|
71 change.origin.charAt(0) == "*")) &&
|
|
72 (cur = lastChangeEvent(hist, hist.lastOp == opId))) {
|
|
73 // Merge this change into the last event
|
|
74 last = lst(cur.changes)
|
|
75 if (cmp(change.from, change.to) == 0 && cmp(change.from, last.to) == 0) {
|
|
76 // Optimized case for simple insertion -- don't want to add
|
|
77 // new changesets for every character typed
|
|
78 last.to = changeEnd(change)
|
|
79 } else {
|
|
80 // Add new sub-event
|
|
81 cur.changes.push(historyChangeFromChange(doc, change))
|
|
82 }
|
|
83 } else {
|
|
84 // Can not be merged, start a new event.
|
|
85 let before = lst(hist.done)
|
|
86 if (!before || !before.ranges)
|
|
87 pushSelectionToHistory(doc.sel, hist.done)
|
|
88 cur = {changes: [historyChangeFromChange(doc, change)],
|
|
89 generation: hist.generation}
|
|
90 hist.done.push(cur)
|
|
91 while (hist.done.length > hist.undoDepth) {
|
|
92 hist.done.shift()
|
|
93 if (!hist.done[0].ranges) hist.done.shift()
|
|
94 }
|
|
95 }
|
|
96 hist.done.push(selAfter)
|
|
97 hist.generation = ++hist.maxGeneration
|
|
98 hist.lastModTime = hist.lastSelTime = time
|
|
99 hist.lastOp = hist.lastSelOp = opId
|
|
100 hist.lastOrigin = hist.lastSelOrigin = change.origin
|
|
101
|
|
102 if (!last) signal(doc, "historyAdded")
|
|
103 }
|
|
104
|
|
105 function selectionEventCanBeMerged(doc, origin, prev, sel) {
|
|
106 let ch = origin.charAt(0)
|
|
107 return ch == "*" ||
|
|
108 ch == "+" &&
|
|
109 prev.ranges.length == sel.ranges.length &&
|
|
110 prev.somethingSelected() == sel.somethingSelected() &&
|
|
111 new Date - doc.history.lastSelTime <= (doc.cm ? doc.cm.options.historyEventDelay : 500)
|
|
112 }
|
|
113
|
|
114 // Called whenever the selection changes, sets the new selection as
|
|
115 // the pending selection in the history, and pushes the old pending
|
|
116 // selection into the 'done' array when it was significantly
|
|
117 // different (in number of selected ranges, emptiness, or time).
|
|
118 export function addSelectionToHistory(doc, sel, opId, options) {
|
|
119 let hist = doc.history, origin = options && options.origin
|
|
120
|
|
121 // A new event is started when the previous origin does not match
|
|
122 // the current, or the origins don't allow matching. Origins
|
|
123 // starting with * are always merged, those starting with + are
|
|
124 // merged when similar and close together in time.
|
|
125 if (opId == hist.lastSelOp ||
|
|
126 (origin && hist.lastSelOrigin == origin &&
|
|
127 (hist.lastModTime == hist.lastSelTime && hist.lastOrigin == origin ||
|
|
128 selectionEventCanBeMerged(doc, origin, lst(hist.done), sel))))
|
|
129 hist.done[hist.done.length - 1] = sel
|
|
130 else
|
|
131 pushSelectionToHistory(sel, hist.done)
|
|
132
|
|
133 hist.lastSelTime = +new Date
|
|
134 hist.lastSelOrigin = origin
|
|
135 hist.lastSelOp = opId
|
|
136 if (options && options.clearRedo !== false)
|
|
137 clearSelectionEvents(hist.undone)
|
|
138 }
|
|
139
|
|
140 export function pushSelectionToHistory(sel, dest) {
|
|
141 let top = lst(dest)
|
|
142 if (!(top && top.ranges && top.equals(sel)))
|
|
143 dest.push(sel)
|
|
144 }
|
|
145
|
|
146 // Used to store marked span information in the history.
|
|
147 function attachLocalSpans(doc, change, from, to) {
|
|
148 let existing = change["spans_" + doc.id], n = 0
|
|
149 doc.iter(Math.max(doc.first, from), Math.min(doc.first + doc.size, to), line => {
|
|
150 if (line.markedSpans)
|
|
151 (existing || (existing = change["spans_" + doc.id] = {}))[n] = line.markedSpans
|
|
152 ++n
|
|
153 })
|
|
154 }
|
|
155
|
|
156 // When un/re-doing restores text containing marked spans, those
|
|
157 // that have been explicitly cleared should not be restored.
|
|
158 function removeClearedSpans(spans) {
|
|
159 if (!spans) return null
|
|
160 let out
|
|
161 for (let i = 0; i < spans.length; ++i) {
|
|
162 if (spans[i].marker.explicitlyCleared) { if (!out) out = spans.slice(0, i) }
|
|
163 else if (out) out.push(spans[i])
|
|
164 }
|
|
165 return !out ? spans : out.length ? out : null
|
|
166 }
|
|
167
|
|
168 // Retrieve and filter the old marked spans stored in a change event.
|
|
169 function getOldSpans(doc, change) {
|
|
170 let found = change["spans_" + doc.id]
|
|
171 if (!found) return null
|
|
172 let nw = []
|
|
173 for (let i = 0; i < change.text.length; ++i)
|
|
174 nw.push(removeClearedSpans(found[i]))
|
|
175 return nw
|
|
176 }
|
|
177
|
|
178 // Used for un/re-doing changes from the history. Combines the
|
|
179 // result of computing the existing spans with the set of spans that
|
|
180 // existed in the history (so that deleting around a span and then
|
|
181 // undoing brings back the span).
|
|
182 export function mergeOldSpans(doc, change) {
|
|
183 let old = getOldSpans(doc, change)
|
|
184 let stretched = stretchSpansOverChange(doc, change)
|
|
185 if (!old) return stretched
|
|
186 if (!stretched) return old
|
|
187
|
|
188 for (let i = 0; i < old.length; ++i) {
|
|
189 let oldCur = old[i], stretchCur = stretched[i]
|
|
190 if (oldCur && stretchCur) {
|
|
191 spans: for (let j = 0; j < stretchCur.length; ++j) {
|
|
192 let span = stretchCur[j]
|
|
193 for (let k = 0; k < oldCur.length; ++k)
|
|
194 if (oldCur[k].marker == span.marker) continue spans
|
|
195 oldCur.push(span)
|
|
196 }
|
|
197 } else if (stretchCur) {
|
|
198 old[i] = stretchCur
|
|
199 }
|
|
200 }
|
|
201 return old
|
|
202 }
|
|
203
|
|
204 // Used both to provide a JSON-safe object in .getHistory, and, when
|
|
205 // detaching a document, to split the history in two
|
|
206 export function copyHistoryArray(events, newGroup, instantiateSel) {
|
|
207 let copy = []
|
|
208 for (let i = 0; i < events.length; ++i) {
|
|
209 let event = events[i]
|
|
210 if (event.ranges) {
|
|
211 copy.push(instantiateSel ? Selection.prototype.deepCopy.call(event) : event)
|
|
212 continue
|
|
213 }
|
|
214 let changes = event.changes, newChanges = []
|
|
215 copy.push({changes: newChanges})
|
|
216 for (let j = 0; j < changes.length; ++j) {
|
|
217 let change = changes[j], m
|
|
218 newChanges.push({from: change.from, to: change.to, text: change.text})
|
|
219 if (newGroup) for (var prop in change) if (m = prop.match(/^spans_(\d+)$/)) {
|
|
220 if (indexOf(newGroup, Number(m[1])) > -1) {
|
|
221 lst(newChanges)[prop] = change[prop]
|
|
222 delete change[prop]
|
|
223 }
|
|
224 }
|
|
225 }
|
|
226 }
|
|
227 return copy
|
|
228 }
|