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