/*---------------------------------------------------------------------------------------------
 *  Copyright (c) Microsoft Corporation. All rights reserved.
 *  Licensed under the MIT License. See License.txt in the project root for license information.
 *--------------------------------------------------------------------------------------------*/
import { ArrayQueue } from '../../../base/common/arrays.js';
import { RunOnceScheduler } from '../../../base/common/async.js';
import { Color } from '../../../base/common/color.js';
import { Disposable } from '../../../base/common/lifecycle.js';
import * as platform from '../../../base/common/platform.js';
import * as strings from '../../../base/common/strings.js';
import { EDITOR_FONT_DEFAULTS, filterValidationDecorations } from '../config/editorOptions.js';
import { CursorsController } from '../cursor/cursor.js';
import { CursorConfiguration } from '../cursorCommon.js';
import { Position } from '../core/position.js';
import { Range } from '../core/range.js';
import * as textModelEvents from '../textModelEvents.js';
import { TokenizationRegistry } from '../languages.js';
import { PLAINTEXT_LANGUAGE_ID } from '../languages/modesRegistry.js';
import { tokenizeLineToHTML } from '../languages/textToHtmlTokenizer.js';
import * as viewEvents from '../viewEvents.js';
import { ViewLayout } from '../viewLayout/viewLayout.js';
import { MinimapTokensColorTracker } from './minimapTokensColorTracker.js';
import { MinimapLinesRenderingData, OverviewRulerDecorationsGroup, ViewLineRenderingData } from '../viewModel.js';
import { ViewModelDecorations } from './viewModelDecorations.js';
import { FocusChangedEvent, HiddenAreasChangedEvent, ModelContentChangedEvent, ModelDecorationsChangedEvent, ModelLanguageChangedEvent, ModelLanguageConfigurationChangedEvent, ModelOptionsChangedEvent, ModelTokensChangedEvent, ReadOnlyEditAttemptEvent, ScrollChangedEvent, ViewModelEventDispatcher, ViewZonesChangedEvent } from '../viewModelEventDispatcher.js';
import { ViewModelLinesFromModelAsIs, ViewModelLinesFromProjectedModel } from './viewModelLines.js';
const USE_IDENTITY_LINES_COLLECTION = true;
export class ViewModel extends Disposable {
    constructor(editorId, configuration, model, domLineBreaksComputerFactory, monospaceLineBreaksComputerFactory, scheduleAtNextAnimationFrame, languageConfigurationService, _themeService) {
        super();
        this.languageConfigurationService = languageConfigurationService;
        this._themeService = _themeService;
        this.hiddenAreasModel = new HiddenAreasModel();
        this.previousHiddenAreas = [];
        this._editorId = editorId;
        this._configuration = configuration;
        this.model = model;
        this._eventDispatcher = new ViewModelEventDispatcher();
        this.onEvent = this._eventDispatcher.onEvent;
        this.cursorConfig = new CursorConfiguration(this.model.getLanguageId(), this.model.getOptions(), this._configuration, this.languageConfigurationService);
        this._tokenizeViewportSoon = this._register(new RunOnceScheduler(() => this.tokenizeViewport(), 50));
        this._updateConfigurationViewLineCount = this._register(new RunOnceScheduler(() => this._updateConfigurationViewLineCountNow(), 0));
        this._hasFocus = false;
        this._viewportStart = ViewportStart.create(this.model);
        if (USE_IDENTITY_LINES_COLLECTION && this.model.isTooLargeForTokenization()) {
            this._lines = new ViewModelLinesFromModelAsIs(this.model);
        }
        else {
            const options = this._configuration.options;
            const fontInfo = options.get(45 /* EditorOption.fontInfo */);
            const wrappingStrategy = options.get(127 /* EditorOption.wrappingStrategy */);
            const wrappingInfo = options.get(134 /* EditorOption.wrappingInfo */);
            const wrappingIndent = options.get(126 /* EditorOption.wrappingIndent */);
            this._lines = new ViewModelLinesFromProjectedModel(this._editorId, this.model, domLineBreaksComputerFactory, monospaceLineBreaksComputerFactory, fontInfo, this.model.getOptions().tabSize, wrappingStrategy, wrappingInfo.wrappingColumn, wrappingIndent);
        }
        this.coordinatesConverter = this._lines.createCoordinatesConverter();
        this._cursor = this._register(new CursorsController(model, this, this.coordinatesConverter, this.cursorConfig));
        this.viewLayout = this._register(new ViewLayout(this._configuration, this.getLineCount(), scheduleAtNextAnimationFrame));
        this._register(this.viewLayout.onDidScroll((e) => {
            if (e.scrollTopChanged) {
                this._tokenizeViewportSoon.schedule();
            }
            if (e.scrollTopChanged) {
                this._viewportStart.invalidate();
            }
            this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewScrollChangedEvent(e));
            this._eventDispatcher.emitOutgoingEvent(new ScrollChangedEvent(e.oldScrollWidth, e.oldScrollLeft, e.oldScrollHeight, e.oldScrollTop, e.scrollWidth, e.scrollLeft, e.scrollHeight, e.scrollTop));
        }));
        this._register(this.viewLayout.onDidContentSizeChange((e) => {
            this._eventDispatcher.emitOutgoingEvent(e);
        }));
        this._decorations = new ViewModelDecorations(this._editorId, this.model, this._configuration, this._lines, this.coordinatesConverter);
        this._registerModelEvents();
        this._register(this._configuration.onDidChangeFast((e) => {
            try {
                const eventsCollector = this._eventDispatcher.beginEmitViewEvents();
                this._onConfigurationChanged(eventsCollector, e);
            }
            finally {
                this._eventDispatcher.endEmitViewEvents();
            }
        }));
        this._register(MinimapTokensColorTracker.getInstance().onDidChange(() => {
            this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewTokensColorsChangedEvent());
        }));
        this._register(this._themeService.onDidColorThemeChange((theme) => {
            this._invalidateDecorationsColorCache();
            this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewThemeChangedEvent(theme));
        }));
        this._updateConfigurationViewLineCountNow();
    }
    dispose() {
        // First remove listeners, as disposing the lines might end up sending
        // model decoration changed events ... and we no longer care about them ...
        super.dispose();
        this._decorations.dispose();
        this._lines.dispose();
        this._viewportStart.dispose();
        this._eventDispatcher.dispose();
    }
    createLineBreaksComputer() {
        return this._lines.createLineBreaksComputer();
    }
    addViewEventHandler(eventHandler) {
        this._eventDispatcher.addViewEventHandler(eventHandler);
    }
    removeViewEventHandler(eventHandler) {
        this._eventDispatcher.removeViewEventHandler(eventHandler);
    }
    _updateConfigurationViewLineCountNow() {
        this._configuration.setViewLineCount(this._lines.getViewLineCount());
    }
    tokenizeViewport() {
        const linesViewportData = this.viewLayout.getLinesViewportData();
        const viewVisibleRange = new Range(linesViewportData.startLineNumber, this.getLineMinColumn(linesViewportData.startLineNumber), linesViewportData.endLineNumber, this.getLineMaxColumn(linesViewportData.endLineNumber));
        const modelVisibleRanges = this._toModelVisibleRanges(viewVisibleRange);
        for (const modelVisibleRange of modelVisibleRanges) {
            this.model.tokenization.tokenizeViewport(modelVisibleRange.startLineNumber, modelVisibleRange.endLineNumber);
        }
    }
    setHasFocus(hasFocus) {
        this._hasFocus = hasFocus;
        this._cursor.setHasFocus(hasFocus);
        this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewFocusChangedEvent(hasFocus));
        this._eventDispatcher.emitOutgoingEvent(new FocusChangedEvent(!hasFocus, hasFocus));
    }
    onCompositionStart() {
        this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewCompositionStartEvent());
    }
    onCompositionEnd() {
        this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewCompositionEndEvent());
    }
    _captureStableViewport() {
        // We might need to restore the current start view range, so save it (if available)
        // But only if the scroll position is not at the top of the file
        if (this._viewportStart.isValid && this.viewLayout.getCurrentScrollTop() > 0) {
            const previousViewportStartViewPosition = new Position(this._viewportStart.viewLineNumber, this.getLineMinColumn(this._viewportStart.viewLineNumber));
            const previousViewportStartModelPosition = this.coordinatesConverter.convertViewPositionToModelPosition(previousViewportStartViewPosition);
            return new StableViewport(previousViewportStartModelPosition, this._viewportStart.startLineDelta);
        }
        return new StableViewport(null, 0);
    }
    _onConfigurationChanged(eventsCollector, e) {
        const stableViewport = this._captureStableViewport();
        const options = this._configuration.options;
        const fontInfo = options.get(45 /* EditorOption.fontInfo */);
        const wrappingStrategy = options.get(127 /* EditorOption.wrappingStrategy */);
        const wrappingInfo = options.get(134 /* EditorOption.wrappingInfo */);
        const wrappingIndent = options.get(126 /* EditorOption.wrappingIndent */);
        if (this._lines.setWrappingSettings(fontInfo, wrappingStrategy, wrappingInfo.wrappingColumn, wrappingIndent)) {
            eventsCollector.emitViewEvent(new viewEvents.ViewFlushedEvent());
            eventsCollector.emitViewEvent(new viewEvents.ViewLineMappingChangedEvent());
            eventsCollector.emitViewEvent(new viewEvents.ViewDecorationsChangedEvent(null));
            this._cursor.onLineMappingChanged(eventsCollector);
            this._decorations.onLineMappingChanged();
            this.viewLayout.onFlushed(this.getLineCount());
            this._updateConfigurationViewLineCount.schedule();
        }
        if (e.hasChanged(82 /* EditorOption.readOnly */)) {
            // Must read again all decorations due to readOnly filtering
            this._decorations.reset();
            eventsCollector.emitViewEvent(new viewEvents.ViewDecorationsChangedEvent(null));
        }
        eventsCollector.emitViewEvent(new viewEvents.ViewConfigurationChangedEvent(e));
        this.viewLayout.onConfigurationChanged(e);
        stableViewport.recoverViewportStart(this.coordinatesConverter, this.viewLayout);
        if (CursorConfiguration.shouldRecreate(e)) {
            this.cursorConfig = new CursorConfiguration(this.model.getLanguageId(), this.model.getOptions(), this._configuration, this.languageConfigurationService);
            this._cursor.updateConfiguration(this.cursorConfig);
        }
    }
    _registerModelEvents() {
        this._register(this.model.onDidChangeContentOrInjectedText((e) => {
            try {
                const eventsCollector = this._eventDispatcher.beginEmitViewEvents();
                let hadOtherModelChange = false;
                let hadModelLineChangeThatChangedLineMapping = false;
                const changes = (e instanceof textModelEvents.InternalModelContentChangeEvent ? e.rawContentChangedEvent.changes : e.changes);
                const versionId = (e instanceof textModelEvents.InternalModelContentChangeEvent ? e.rawContentChangedEvent.versionId : null);
                // Do a first pass to compute line mappings, and a second pass to actually interpret them
                const lineBreaksComputer = this._lines.createLineBreaksComputer();
                for (const change of changes) {
                    switch (change.changeType) {
                        case 4 /* textModelEvents.RawContentChangedType.LinesInserted */: {
                            for (let lineIdx = 0; lineIdx < change.detail.length; lineIdx++) {
                                const line = change.detail[lineIdx];
                                let injectedText = change.injectedTexts[lineIdx];
                                if (injectedText) {
                                    injectedText = injectedText.filter(element => (!element.ownerId || element.ownerId === this._editorId));
                                }
                                lineBreaksComputer.addRequest(line, injectedText, null);
                            }
                            break;
                        }
                        case 2 /* textModelEvents.RawContentChangedType.LineChanged */: {
                            let injectedText = null;
                            if (change.injectedText) {
                                injectedText = change.injectedText.filter(element => (!element.ownerId || element.ownerId === this._editorId));
                            }
                            lineBreaksComputer.addRequest(change.detail, injectedText, null);
                            break;
                        }
                    }
                }
                const lineBreaks = lineBreaksComputer.finalize();
                const lineBreakQueue = new ArrayQueue(lineBreaks);
                for (const change of changes) {
                    switch (change.changeType) {
                        case 1 /* textModelEvents.RawContentChangedType.Flush */: {
                            this._lines.onModelFlushed();
                            eventsCollector.emitViewEvent(new viewEvents.ViewFlushedEvent());
                            this._decorations.reset();
                            this.viewLayout.onFlushed(this.getLineCount());
                            hadOtherModelChange = true;
                            break;
                        }
                        case 3 /* textModelEvents.RawContentChangedType.LinesDeleted */: {
                            const linesDeletedEvent = this._lines.onModelLinesDeleted(versionId, change.fromLineNumber, change.toLineNumber);
                            if (linesDeletedEvent !== null) {
                                eventsCollector.emitViewEvent(linesDeletedEvent);
                                this.viewLayout.onLinesDeleted(linesDeletedEvent.fromLineNumber, linesDeletedEvent.toLineNumber);
                            }
                            hadOtherModelChange = true;
                            break;
                        }
                        case 4 /* textModelEvents.RawContentChangedType.LinesInserted */: {
                            const insertedLineBreaks = lineBreakQueue.takeCount(change.detail.length);
                            const linesInsertedEvent = this._lines.onModelLinesInserted(versionId, change.fromLineNumber, change.toLineNumber, insertedLineBreaks);
                            if (linesInsertedEvent !== null) {
                                eventsCollector.emitViewEvent(linesInsertedEvent);
                                this.viewLayout.onLinesInserted(linesInsertedEvent.fromLineNumber, linesInsertedEvent.toLineNumber);
                            }
                            hadOtherModelChange = true;
                            break;
                        }
                        case 2 /* textModelEvents.RawContentChangedType.LineChanged */: {
                            const changedLineBreakData = lineBreakQueue.dequeue();
                            const [lineMappingChanged, linesChangedEvent, linesInsertedEvent, linesDeletedEvent] = this._lines.onModelLineChanged(versionId, change.lineNumber, changedLineBreakData);
                            hadModelLineChangeThatChangedLineMapping = lineMappingChanged;
                            if (linesChangedEvent) {
                                eventsCollector.emitViewEvent(linesChangedEvent);
                            }
                            if (linesInsertedEvent) {
                                eventsCollector.emitViewEvent(linesInsertedEvent);
                                this.viewLayout.onLinesInserted(linesInsertedEvent.fromLineNumber, linesInsertedEvent.toLineNumber);
                            }
                            if (linesDeletedEvent) {
                                eventsCollector.emitViewEvent(linesDeletedEvent);
                                this.viewLayout.onLinesDeleted(linesDeletedEvent.fromLineNumber, linesDeletedEvent.toLineNumber);
                            }
                            break;
                        }
                        case 5 /* textModelEvents.RawContentChangedType.EOLChanged */: {
                            // Nothing to do. The new version will be accepted below
                            break;
                        }
                    }
                }
                if (versionId !== null) {
                    this._lines.acceptVersionId(versionId);
                }
                this.viewLayout.onHeightMaybeChanged();
                if (!hadOtherModelChange && hadModelLineChangeThatChangedLineMapping) {
                    eventsCollector.emitViewEvent(new viewEvents.ViewLineMappingChangedEvent());
                    eventsCollector.emitViewEvent(new viewEvents.ViewDecorationsChangedEvent(null));
                    this._cursor.onLineMappingChanged(eventsCollector);
                    this._decorations.onLineMappingChanged();
                }
            }
            finally {
                this._eventDispatcher.endEmitViewEvents();
            }
            // Update the configuration and reset the centered view line
            const viewportStartWasValid = this._viewportStart.isValid;
            this._viewportStart.invalidate();
            this._configuration.setModelLineCount(this.model.getLineCount());
            this._updateConfigurationViewLineCountNow();
            // Recover viewport
            if (!this._hasFocus && this.model.getAttachedEditorCount() >= 2 && viewportStartWasValid) {
                const modelRange = this.model._getTrackedRange(this._viewportStart.modelTrackedRange);
                if (modelRange) {
                    const viewPosition = this.coordinatesConverter.convertModelPositionToViewPosition(modelRange.getStartPosition());
                    const viewPositionTop = this.viewLayout.getVerticalOffsetForLineNumber(viewPosition.lineNumber);
                    this.viewLayout.setScrollPosition({ scrollTop: viewPositionTop + this._viewportStart.startLineDelta }, 1 /* ScrollType.Immediate */);
                }
            }
            try {
                const eventsCollector = this._eventDispatcher.beginEmitViewEvents();
                if (e instanceof textModelEvents.InternalModelContentChangeEvent) {
                    eventsCollector.emitOutgoingEvent(new ModelContentChangedEvent(e.contentChangedEvent));
                }
                this._cursor.onModelContentChanged(eventsCollector, e);
            }
            finally {
                this._eventDispatcher.endEmitViewEvents();
            }
            this._tokenizeViewportSoon.schedule();
        }));
        this._register(this.model.onDidChangeTokens((e) => {
            const viewRanges = [];
            for (let j = 0, lenJ = e.ranges.length; j < lenJ; j++) {
                const modelRange = e.ranges[j];
                const viewStartLineNumber = this.coordinatesConverter.convertModelPositionToViewPosition(new Position(modelRange.fromLineNumber, 1)).lineNumber;
                const viewEndLineNumber = this.coordinatesConverter.convertModelPositionToViewPosition(new Position(modelRange.toLineNumber, this.model.getLineMaxColumn(modelRange.toLineNumber))).lineNumber;
                viewRanges[j] = {
                    fromLineNumber: viewStartLineNumber,
                    toLineNumber: viewEndLineNumber
                };
            }
            this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewTokensChangedEvent(viewRanges));
            if (e.tokenizationSupportChanged) {
                this._tokenizeViewportSoon.schedule();
            }
            this._eventDispatcher.emitOutgoingEvent(new ModelTokensChangedEvent(e));
        }));
        this._register(this.model.onDidChangeLanguageConfiguration((e) => {
            this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewLanguageConfigurationEvent());
            this.cursorConfig = new CursorConfiguration(this.model.getLanguageId(), this.model.getOptions(), this._configuration, this.languageConfigurationService);
            this._cursor.updateConfiguration(this.cursorConfig);
            this._eventDispatcher.emitOutgoingEvent(new ModelLanguageConfigurationChangedEvent(e));
        }));
        this._register(this.model.onDidChangeLanguage((e) => {
            this.cursorConfig = new CursorConfiguration(this.model.getLanguageId(), this.model.getOptions(), this._configuration, this.languageConfigurationService);
            this._cursor.updateConfiguration(this.cursorConfig);
            this._eventDispatcher.emitOutgoingEvent(new ModelLanguageChangedEvent(e));
        }));
        this._register(this.model.onDidChangeOptions((e) => {
            // A tab size change causes a line mapping changed event => all view parts will repaint OK, no further event needed here
            if (this._lines.setTabSize(this.model.getOptions().tabSize)) {
                try {
                    const eventsCollector = this._eventDispatcher.beginEmitViewEvents();
                    eventsCollector.emitViewEvent(new viewEvents.ViewFlushedEvent());
                    eventsCollector.emitViewEvent(new viewEvents.ViewLineMappingChangedEvent());
                    eventsCollector.emitViewEvent(new viewEvents.ViewDecorationsChangedEvent(null));
                    this._cursor.onLineMappingChanged(eventsCollector);
                    this._decorations.onLineMappingChanged();
                    this.viewLayout.onFlushed(this.getLineCount());
                }
                finally {
                    this._eventDispatcher.endEmitViewEvents();
                }
                this._updateConfigurationViewLineCount.schedule();
            }
            this.cursorConfig = new CursorConfiguration(this.model.getLanguageId(), this.model.getOptions(), this._configuration, this.languageConfigurationService);
            this._cursor.updateConfiguration(this.cursorConfig);
            this._eventDispatcher.emitOutgoingEvent(new ModelOptionsChangedEvent(e));
        }));
        this._register(this.model.onDidChangeDecorations((e) => {
            this._decorations.onModelDecorationsChanged();
            this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewDecorationsChangedEvent(e));
            this._eventDispatcher.emitOutgoingEvent(new ModelDecorationsChangedEvent(e));
        }));
    }
    setHiddenAreas(ranges, source) {
        this.hiddenAreasModel.setHiddenAreas(source, ranges);
        const mergedRanges = this.hiddenAreasModel.getMergedRanges();
        if (mergedRanges === this.previousHiddenAreas) {
            return;
        }
        this.previousHiddenAreas = mergedRanges;
        const stableViewport = this._captureStableViewport();
        let lineMappingChanged = false;
        try {
            const eventsCollector = this._eventDispatcher.beginEmitViewEvents();
            lineMappingChanged = this._lines.setHiddenAreas(mergedRanges);
            if (lineMappingChanged) {
                eventsCollector.emitViewEvent(new viewEvents.ViewFlushedEvent());
                eventsCollector.emitViewEvent(new viewEvents.ViewLineMappingChangedEvent());
                eventsCollector.emitViewEvent(new viewEvents.ViewDecorationsChangedEvent(null));
                this._cursor.onLineMappingChanged(eventsCollector);
                this._decorations.onLineMappingChanged();
                this.viewLayout.onFlushed(this.getLineCount());
                this.viewLayout.onHeightMaybeChanged();
            }
            stableViewport.recoverViewportStart(this.coordinatesConverter, this.viewLayout);
        }
        finally {
            this._eventDispatcher.endEmitViewEvents();
        }
        this._updateConfigurationViewLineCount.schedule();
        if (lineMappingChanged) {
            this._eventDispatcher.emitOutgoingEvent(new HiddenAreasChangedEvent());
        }
    }
    getVisibleRangesPlusViewportAboveBelow() {
        const layoutInfo = this._configuration.options.get(133 /* EditorOption.layoutInfo */);
        const lineHeight = this._configuration.options.get(60 /* EditorOption.lineHeight */);
        const linesAround = Math.max(20, Math.round(layoutInfo.height / lineHeight));
        const partialData = this.viewLayout.getLinesViewportData();
        const startViewLineNumber = Math.max(1, partialData.completelyVisibleStartLineNumber - linesAround);
        const endViewLineNumber = Math.min(this.getLineCount(), partialData.completelyVisibleEndLineNumber + linesAround);
        return this._toModelVisibleRanges(new Range(startViewLineNumber, this.getLineMinColumn(startViewLineNumber), endViewLineNumber, this.getLineMaxColumn(endViewLineNumber)));
    }
    getVisibleRanges() {
        const visibleViewRange = this.getCompletelyVisibleViewRange();
        return this._toModelVisibleRanges(visibleViewRange);
    }
    getHiddenAreas() {
        return this._lines.getHiddenAreas();
    }
    _toModelVisibleRanges(visibleViewRange) {
        const visibleRange = this.coordinatesConverter.convertViewRangeToModelRange(visibleViewRange);
        const hiddenAreas = this._lines.getHiddenAreas();
        if (hiddenAreas.length === 0) {
            return [visibleRange];
        }
        const result = [];
        let resultLen = 0;
        let startLineNumber = visibleRange.startLineNumber;
        let startColumn = visibleRange.startColumn;
        const endLineNumber = visibleRange.endLineNumber;
        const endColumn = visibleRange.endColumn;
        for (let i = 0, len = hiddenAreas.length; i < len; i++) {
            const hiddenStartLineNumber = hiddenAreas[i].startLineNumber;
            const hiddenEndLineNumber = hiddenAreas[i].endLineNumber;
            if (hiddenEndLineNumber < startLineNumber) {
                continue;
            }
            if (hiddenStartLineNumber > endLineNumber) {
                continue;
            }
            if (startLineNumber < hiddenStartLineNumber) {
                result[resultLen++] = new Range(startLineNumber, startColumn, hiddenStartLineNumber - 1, this.model.getLineMaxColumn(hiddenStartLineNumber - 1));
            }
            startLineNumber = hiddenEndLineNumber + 1;
            startColumn = 1;
        }
        if (startLineNumber < endLineNumber || (startLineNumber === endLineNumber && startColumn < endColumn)) {
            result[resultLen++] = new Range(startLineNumber, startColumn, endLineNumber, endColumn);
        }
        return result;
    }
    getCompletelyVisibleViewRange() {
        const partialData = this.viewLayout.getLinesViewportData();
        const startViewLineNumber = partialData.completelyVisibleStartLineNumber;
        const endViewLineNumber = partialData.completelyVisibleEndLineNumber;
        return new Range(startViewLineNumber, this.getLineMinColumn(startViewLineNumber), endViewLineNumber, this.getLineMaxColumn(endViewLineNumber));
    }
    getCompletelyVisibleViewRangeAtScrollTop(scrollTop) {
        const partialData = this.viewLayout.getLinesViewportDataAtScrollTop(scrollTop);
        const startViewLineNumber = partialData.completelyVisibleStartLineNumber;
        const endViewLineNumber = partialData.completelyVisibleEndLineNumber;
        return new Range(startViewLineNumber, this.getLineMinColumn(startViewLineNumber), endViewLineNumber, this.getLineMaxColumn(endViewLineNumber));
    }
    saveState() {
        const compatViewState = this.viewLayout.saveState();
        const scrollTop = compatViewState.scrollTop;
        const firstViewLineNumber = this.viewLayout.getLineNumberAtVerticalOffset(scrollTop);
        const firstPosition = this.coordinatesConverter.convertViewPositionToModelPosition(new Position(firstViewLineNumber, this.getLineMinColumn(firstViewLineNumber)));
        const firstPositionDeltaTop = this.viewLayout.getVerticalOffsetForLineNumber(firstViewLineNumber) - scrollTop;
        return {
            scrollLeft: compatViewState.scrollLeft,
            firstPosition: firstPosition,
            firstPositionDeltaTop: firstPositionDeltaTop
        };
    }
    reduceRestoreState(state) {
        if (typeof state.firstPosition === 'undefined') {
            // This is a view state serialized by an older version
            return this._reduceRestoreStateCompatibility(state);
        }
        const modelPosition = this.model.validatePosition(state.firstPosition);
        const viewPosition = this.coordinatesConverter.convertModelPositionToViewPosition(modelPosition);
        const scrollTop = this.viewLayout.getVerticalOffsetForLineNumber(viewPosition.lineNumber) - state.firstPositionDeltaTop;
        return {
            scrollLeft: state.scrollLeft,
            scrollTop: scrollTop
        };
    }
    _reduceRestoreStateCompatibility(state) {
        return {
            scrollLeft: state.scrollLeft,
            scrollTop: state.scrollTopWithoutViewZones
        };
    }
    getTabSize() {
        return this.model.getOptions().tabSize;
    }
    getLineCount() {
        return this._lines.getViewLineCount();
    }
    /**
     * Gives a hint that a lot of requests are about to come in for these line numbers.
     */
    setViewport(startLineNumber, endLineNumber, centeredLineNumber) {
        this._viewportStart.update(this, startLineNumber);
    }
    getActiveIndentGuide(lineNumber, minLineNumber, maxLineNumber) {
        return this._lines.getActiveIndentGuide(lineNumber, minLineNumber, maxLineNumber);
    }
    getLinesIndentGuides(startLineNumber, endLineNumber) {
        return this._lines.getViewLinesIndentGuides(startLineNumber, endLineNumber);
    }
    getBracketGuidesInRangeByLine(startLineNumber, endLineNumber, activePosition, options) {
        return this._lines.getViewLinesBracketGuides(startLineNumber, endLineNumber, activePosition, options);
    }
    getLineContent(lineNumber) {
        return this._lines.getViewLineContent(lineNumber);
    }
    getLineLength(lineNumber) {
        return this._lines.getViewLineLength(lineNumber);
    }
    getLineMinColumn(lineNumber) {
        return this._lines.getViewLineMinColumn(lineNumber);
    }
    getLineMaxColumn(lineNumber) {
        return this._lines.getViewLineMaxColumn(lineNumber);
    }
    getLineFirstNonWhitespaceColumn(lineNumber) {
        const result = strings.firstNonWhitespaceIndex(this.getLineContent(lineNumber));
        if (result === -1) {
            return 0;
        }
        return result + 1;
    }
    getLineLastNonWhitespaceColumn(lineNumber) {
        const result = strings.lastNonWhitespaceIndex(this.getLineContent(lineNumber));
        if (result === -1) {
            return 0;
        }
        return result + 2;
    }
    getDecorationsInViewport(visibleRange, onlyMinimapDecorations = false) {
        return this._decorations.getDecorationsViewportData(visibleRange, onlyMinimapDecorations).decorations;
    }
    getInjectedTextAt(viewPosition) {
        return this._lines.getInjectedTextAt(viewPosition);
    }
    getViewportViewLineRenderingData(visibleRange, lineNumber) {
        const allInlineDecorations = this._decorations.getDecorationsViewportData(visibleRange).inlineDecorations;
        const inlineDecorations = allInlineDecorations[lineNumber - visibleRange.startLineNumber];
        return this._getViewLineRenderingData(lineNumber, inlineDecorations);
    }
    getViewLineRenderingData(lineNumber) {
        const inlineDecorations = this._decorations.getInlineDecorationsOnLine(lineNumber);
        return this._getViewLineRenderingData(lineNumber, inlineDecorations);
    }
    _getViewLineRenderingData(lineNumber, inlineDecorations) {
        const mightContainRTL = this.model.mightContainRTL();
        const mightContainNonBasicASCII = this.model.mightContainNonBasicASCII();
        const tabSize = this.getTabSize();
        const lineData = this._lines.getViewLineData(lineNumber);
        if (lineData.inlineDecorations) {
            inlineDecorations = [
                ...inlineDecorations,
                ...lineData.inlineDecorations.map(d => d.toInlineDecoration(lineNumber))
            ];
        }
        return new ViewLineRenderingData(lineData.minColumn, lineData.maxColumn, lineData.content, lineData.continuesWithWrappedLine, mightContainRTL, mightContainNonBasicASCII, lineData.tokens, inlineDecorations, tabSize, lineData.startVisibleColumn);
    }
    getViewLineData(lineNumber) {
        return this._lines.getViewLineData(lineNumber);
    }
    getMinimapLinesRenderingData(startLineNumber, endLineNumber, needed) {
        const result = this._lines.getViewLinesData(startLineNumber, endLineNumber, needed);
        return new MinimapLinesRenderingData(this.getTabSize(), result);
    }
    getAllOverviewRulerDecorations(theme) {
        const decorations = this.model.getOverviewRulerDecorations(this._editorId, filterValidationDecorations(this._configuration.options));
        const result = new OverviewRulerDecorations();
        for (const decoration of decorations) {
            const decorationOptions = decoration.options;
            const opts = decorationOptions.overviewRuler;
            if (!opts) {
                continue;
            }
            const lane = opts.position;
            if (lane === 0) {
                continue;
            }
            const color = opts.getColor(theme.value);
            const viewStartLineNumber = this.coordinatesConverter.getViewLineNumberOfModelPosition(decoration.range.startLineNumber, decoration.range.startColumn);
            const viewEndLineNumber = this.coordinatesConverter.getViewLineNumberOfModelPosition(decoration.range.endLineNumber, decoration.range.endColumn);
            result.accept(color, decorationOptions.zIndex, viewStartLineNumber, viewEndLineNumber, lane);
        }
        return result.asArray;
    }
    _invalidateDecorationsColorCache() {
        const decorations = this.model.getOverviewRulerDecorations();
        for (const decoration of decorations) {
            const opts1 = decoration.options.overviewRuler;
            opts1 === null || opts1 === void 0 ? void 0 : opts1.invalidateCachedColor();
            const opts2 = decoration.options.minimap;
            opts2 === null || opts2 === void 0 ? void 0 : opts2.invalidateCachedColor();
        }
    }
    getValueInRange(range, eol) {
        const modelRange = this.coordinatesConverter.convertViewRangeToModelRange(range);
        return this.model.getValueInRange(modelRange, eol);
    }
    getValueLengthInRange(range, eol) {
        const modelRange = this.coordinatesConverter.convertViewRangeToModelRange(range);
        return this.model.getValueLengthInRange(modelRange, eol);
    }
    modifyPosition(position, offset) {
        const modelPosition = this.coordinatesConverter.convertViewPositionToModelPosition(position);
        return this.model.modifyPosition(modelPosition, offset);
    }
    deduceModelPositionRelativeToViewPosition(viewAnchorPosition, deltaOffset, lineFeedCnt) {
        const modelAnchor = this.coordinatesConverter.convertViewPositionToModelPosition(viewAnchorPosition);
        if (this.model.getEOL().length === 2) {
            // This model uses CRLF, so the delta must take that into account
            if (deltaOffset < 0) {
                deltaOffset -= lineFeedCnt;
            }
            else {
                deltaOffset += lineFeedCnt;
            }
        }
        const modelAnchorOffset = this.model.getOffsetAt(modelAnchor);
        const resultOffset = modelAnchorOffset + deltaOffset;
        return this.model.getPositionAt(resultOffset);
    }
    getPlainTextToCopy(modelRanges, emptySelectionClipboard, forceCRLF) {
        const newLineCharacter = forceCRLF ? '\r\n' : this.model.getEOL();
        modelRanges = modelRanges.slice(0);
        modelRanges.sort(Range.compareRangesUsingStarts);
        let hasEmptyRange = false;
        let hasNonEmptyRange = false;
        for (const range of modelRanges) {
            if (range.isEmpty()) {
                hasEmptyRange = true;
            }
            else {
                hasNonEmptyRange = true;
            }
        }
        if (!hasNonEmptyRange) {
            // all ranges are empty
            if (!emptySelectionClipboard) {
                return '';
            }
            const modelLineNumbers = modelRanges.map((r) => r.startLineNumber);
            let result = '';
            for (let i = 0; i < modelLineNumbers.length; i++) {
                if (i > 0 && modelLineNumbers[i - 1] === modelLineNumbers[i]) {
                    continue;
                }
                result += this.model.getLineContent(modelLineNumbers[i]) + newLineCharacter;
            }
            return result;
        }
        if (hasEmptyRange && emptySelectionClipboard) {
            // mixed empty selections and non-empty selections
            const result = [];
            let prevModelLineNumber = 0;
            for (const modelRange of modelRanges) {
                const modelLineNumber = modelRange.startLineNumber;
                if (modelRange.isEmpty()) {
                    if (modelLineNumber !== prevModelLineNumber) {
                        result.push(this.model.getLineContent(modelLineNumber));
                    }
                }
                else {
                    result.push(this.model.getValueInRange(modelRange, forceCRLF ? 2 /* EndOfLinePreference.CRLF */ : 0 /* EndOfLinePreference.TextDefined */));
                }
                prevModelLineNumber = modelLineNumber;
            }
            return result.length === 1 ? result[0] : result;
        }
        const result = [];
        for (const modelRange of modelRanges) {
            if (!modelRange.isEmpty()) {
                result.push(this.model.getValueInRange(modelRange, forceCRLF ? 2 /* EndOfLinePreference.CRLF */ : 0 /* EndOfLinePreference.TextDefined */));
            }
        }
        return result.length === 1 ? result[0] : result;
    }
    getRichTextToCopy(modelRanges, emptySelectionClipboard) {
        const languageId = this.model.getLanguageId();
        if (languageId === PLAINTEXT_LANGUAGE_ID) {
            return null;
        }
        if (modelRanges.length !== 1) {
            // no multiple selection support at this time
            return null;
        }
        let range = modelRanges[0];
        if (range.isEmpty()) {
            if (!emptySelectionClipboard) {
                // nothing to copy
                return null;
            }
            const lineNumber = range.startLineNumber;
            range = new Range(lineNumber, this.model.getLineMinColumn(lineNumber), lineNumber, this.model.getLineMaxColumn(lineNumber));
        }
        const fontInfo = this._configuration.options.get(45 /* EditorOption.fontInfo */);
        const colorMap = this._getColorMap();
        const hasBadChars = (/[:;\\\/<>]/.test(fontInfo.fontFamily));
        const useDefaultFontFamily = (hasBadChars || fontInfo.fontFamily === EDITOR_FONT_DEFAULTS.fontFamily);
        let fontFamily;
        if (useDefaultFontFamily) {
            fontFamily = EDITOR_FONT_DEFAULTS.fontFamily;
        }
        else {
            fontFamily = fontInfo.fontFamily;
            fontFamily = fontFamily.replace(/"/g, '\'');
            const hasQuotesOrIsList = /[,']/.test(fontFamily);
            if (!hasQuotesOrIsList) {
                const needsQuotes = /[+ ]/.test(fontFamily);
                if (needsQuotes) {
                    fontFamily = `'${fontFamily}'`;
                }
            }
            fontFamily = `${fontFamily}, ${EDITOR_FONT_DEFAULTS.fontFamily}`;
        }
        return {
            mode: languageId,
            html: (`<div style="`
                + `color: ${colorMap[1 /* ColorId.DefaultForeground */]};`
                + `background-color: ${colorMap[2 /* ColorId.DefaultBackground */]};`
                + `font-family: ${fontFamily};`
                + `font-weight: ${fontInfo.fontWeight};`
                + `font-size: ${fontInfo.fontSize}px;`
                + `line-height: ${fontInfo.lineHeight}px;`
                + `white-space: pre;`
                + `">`
                + this._getHTMLToCopy(range, colorMap)
                + '</div>')
        };
    }
    _getHTMLToCopy(modelRange, colorMap) {
        const startLineNumber = modelRange.startLineNumber;
        const startColumn = modelRange.startColumn;
        const endLineNumber = modelRange.endLineNumber;
        const endColumn = modelRange.endColumn;
        const tabSize = this.getTabSize();
        let result = '';
        for (let lineNumber = startLineNumber; lineNumber <= endLineNumber; lineNumber++) {
            const lineTokens = this.model.tokenization.getLineTokens(lineNumber);
            const lineContent = lineTokens.getLineContent();
            const startOffset = (lineNumber === startLineNumber ? startColumn - 1 : 0);
            const endOffset = (lineNumber === endLineNumber ? endColumn - 1 : lineContent.length);
            if (lineContent === '') {
                result += '<br>';
            }
            else {
                result += tokenizeLineToHTML(lineContent, lineTokens.inflate(), colorMap, startOffset, endOffset, tabSize, platform.isWindows);
            }
        }
        return result;
    }
    _getColorMap() {
        const colorMap = TokenizationRegistry.getColorMap();
        const result = ['#000000'];
        if (colorMap) {
            for (let i = 1, len = colorMap.length; i < len; i++) {
                result[i] = Color.Format.CSS.formatHex(colorMap[i]);
            }
        }
        return result;
    }
    //#region cursor operations
    getPrimaryCursorState() {
        return this._cursor.getPrimaryCursorState();
    }
    getLastAddedCursorIndex() {
        return this._cursor.getLastAddedCursorIndex();
    }
    getCursorStates() {
        return this._cursor.getCursorStates();
    }
    setCursorStates(source, reason, states) {
        return this._withViewEventsCollector(eventsCollector => this._cursor.setStates(eventsCollector, source, reason, states));
    }
    getCursorColumnSelectData() {
        return this._cursor.getCursorColumnSelectData();
    }
    getCursorAutoClosedCharacters() {
        return this._cursor.getAutoClosedCharacters();
    }
    setCursorColumnSelectData(columnSelectData) {
        this._cursor.setCursorColumnSelectData(columnSelectData);
    }
    getPrevEditOperationType() {
        return this._cursor.getPrevEditOperationType();
    }
    setPrevEditOperationType(type) {
        this._cursor.setPrevEditOperationType(type);
    }
    getSelection() {
        return this._cursor.getSelection();
    }
    getSelections() {
        return this._cursor.getSelections();
    }
    getPosition() {
        return this._cursor.getPrimaryCursorState().modelState.position;
    }
    setSelections(source, selections, reason = 0 /* CursorChangeReason.NotSet */) {
        this._withViewEventsCollector(eventsCollector => this._cursor.setSelections(eventsCollector, source, selections, reason));
    }
    saveCursorState() {
        return this._cursor.saveState();
    }
    restoreCursorState(states) {
        this._withViewEventsCollector(eventsCollector => this._cursor.restoreState(eventsCollector, states));
    }
    _executeCursorEdit(callback) {
        if (this._cursor.context.cursorConfig.readOnly) {
            // we cannot edit when read only...
            this._eventDispatcher.emitOutgoingEvent(new ReadOnlyEditAttemptEvent());
            return;
        }
        this._withViewEventsCollector(callback);
    }
    executeEdits(source, edits, cursorStateComputer) {
        this._executeCursorEdit(eventsCollector => this._cursor.executeEdits(eventsCollector, source, edits, cursorStateComputer));
    }
    startComposition() {
        this._executeCursorEdit(eventsCollector => this._cursor.startComposition(eventsCollector));
    }
    endComposition(source) {
        this._executeCursorEdit(eventsCollector => this._cursor.endComposition(eventsCollector, source));
    }
    type(text, source) {
        this._executeCursorEdit(eventsCollector => this._cursor.type(eventsCollector, text, source));
    }
    compositionType(text, replacePrevCharCnt, replaceNextCharCnt, positionDelta, source) {
        this._executeCursorEdit(eventsCollector => this._cursor.compositionType(eventsCollector, text, replacePrevCharCnt, replaceNextCharCnt, positionDelta, source));
    }
    paste(text, pasteOnNewLine, multicursorText, source) {
        this._executeCursorEdit(eventsCollector => this._cursor.paste(eventsCollector, text, pasteOnNewLine, multicursorText, source));
    }
    cut(source) {
        this._executeCursorEdit(eventsCollector => this._cursor.cut(eventsCollector, source));
    }
    executeCommand(command, source) {
        this._executeCursorEdit(eventsCollector => this._cursor.executeCommand(eventsCollector, command, source));
    }
    executeCommands(commands, source) {
        this._executeCursorEdit(eventsCollector => this._cursor.executeCommands(eventsCollector, commands, source));
    }
    revealPrimaryCursor(source, revealHorizontal, minimalReveal = false) {
        this._withViewEventsCollector(eventsCollector => this._cursor.revealPrimary(eventsCollector, source, minimalReveal, 0 /* viewEvents.VerticalRevealType.Simple */, revealHorizontal, 0 /* ScrollType.Smooth */));
    }
    revealTopMostCursor(source) {
        const viewPosition = this._cursor.getTopMostViewPosition();
        const viewRange = new Range(viewPosition.lineNumber, viewPosition.column, viewPosition.lineNumber, viewPosition.column);
        this._withViewEventsCollector(eventsCollector => eventsCollector.emitViewEvent(new viewEvents.ViewRevealRangeRequestEvent(source, false, viewRange, null, 0 /* viewEvents.VerticalRevealType.Simple */, true, 0 /* ScrollType.Smooth */)));
    }
    revealBottomMostCursor(source) {
        const viewPosition = this._cursor.getBottomMostViewPosition();
        const viewRange = new Range(viewPosition.lineNumber, viewPosition.column, viewPosition.lineNumber, viewPosition.column);
        this._withViewEventsCollector(eventsCollector => eventsCollector.emitViewEvent(new viewEvents.ViewRevealRangeRequestEvent(source, false, viewRange, null, 0 /* viewEvents.VerticalRevealType.Simple */, true, 0 /* ScrollType.Smooth */)));
    }
    revealRange(source, revealHorizontal, viewRange, verticalType, scrollType) {
        this._withViewEventsCollector(eventsCollector => eventsCollector.emitViewEvent(new viewEvents.ViewRevealRangeRequestEvent(source, false, viewRange, null, verticalType, revealHorizontal, scrollType)));
    }
    //#endregion
    //#region viewLayout
    changeWhitespace(callback) {
        const hadAChange = this.viewLayout.changeWhitespace(callback);
        if (hadAChange) {
            this._eventDispatcher.emitSingleViewEvent(new viewEvents.ViewZonesChangedEvent());
            this._eventDispatcher.emitOutgoingEvent(new ViewZonesChangedEvent());
        }
    }
    //#endregion
    _withViewEventsCollector(callback) {
        try {
            const eventsCollector = this._eventDispatcher.beginEmitViewEvents();
            return callback(eventsCollector);
        }
        finally {
            this._eventDispatcher.endEmitViewEvents();
        }
    }
    normalizePosition(position, affinity) {
        return this._lines.normalizePosition(position, affinity);
    }
    /**
     * Gets the column at which indentation stops at a given line.
     * @internal
    */
    getLineIndentColumn(lineNumber) {
        return this._lines.getLineIndentColumn(lineNumber);
    }
}
class ViewportStart {
    static create(model) {
        const viewportStartLineTrackedRange = model._setTrackedRange(null, new Range(1, 1, 1, 1), 1 /* TrackedRangeStickiness.NeverGrowsWhenTypingAtEdges */);
        return new ViewportStart(model, 1, false, viewportStartLineTrackedRange, 0);
    }
    get viewLineNumber() {
        return this._viewLineNumber;
    }
    get isValid() {
        return this._isValid;
    }
    get modelTrackedRange() {
        return this._modelTrackedRange;
    }
    get startLineDelta() {
        return this._startLineDelta;
    }
    constructor(_model, _viewLineNumber, _isValid, _modelTrackedRange, _startLineDelta) {
        this._model = _model;
        this._viewLineNumber = _viewLineNumber;
        this._isValid = _isValid;
        this._modelTrackedRange = _modelTrackedRange;
        this._startLineDelta = _startLineDelta;
    }
    dispose() {
        this._model._setTrackedRange(this._modelTrackedRange, null, 1 /* TrackedRangeStickiness.NeverGrowsWhenTypingAtEdges */);
    }
    update(viewModel, startLineNumber) {
        const position = viewModel.coordinatesConverter.convertViewPositionToModelPosition(new Position(startLineNumber, viewModel.getLineMinColumn(startLineNumber)));
        const viewportStartLineTrackedRange = viewModel.model._setTrackedRange(this._modelTrackedRange, new Range(position.lineNumber, position.column, position.lineNumber, position.column), 1 /* TrackedRangeStickiness.NeverGrowsWhenTypingAtEdges */);
        const viewportStartLineTop = viewModel.viewLayout.getVerticalOffsetForLineNumber(startLineNumber);
        const scrollTop = viewModel.viewLayout.getCurrentScrollTop();
        this._viewLineNumber = startLineNumber;
        this._isValid = true;
        this._modelTrackedRange = viewportStartLineTrackedRange;
        this._startLineDelta = scrollTop - viewportStartLineTop;
    }
    invalidate() {
        this._isValid = false;
    }
}
class OverviewRulerDecorations {
    constructor() {
        this._asMap = Object.create(null);
        this.asArray = [];
    }
    accept(color, zIndex, startLineNumber, endLineNumber, lane) {
        const prevGroup = this._asMap[color];
        if (prevGroup) {
            const prevData = prevGroup.data;
            const prevLane = prevData[prevData.length - 3];
            const prevEndLineNumber = prevData[prevData.length - 1];
            if (prevLane === lane && prevEndLineNumber + 1 >= startLineNumber) {
                // merge into prev
                if (endLineNumber > prevEndLineNumber) {
                    prevData[prevData.length - 1] = endLineNumber;
                }
                return;
            }
            // push
            prevData.push(lane, startLineNumber, endLineNumber);
        }
        else {
            const group = new OverviewRulerDecorationsGroup(color, zIndex, [lane, startLineNumber, endLineNumber]);
            this._asMap[color] = group;
            this.asArray.push(group);
        }
    }
}
class HiddenAreasModel {
    constructor() {
        this.hiddenAreas = new Map();
        this.shouldRecompute = false;
        this.ranges = [];
    }
    setHiddenAreas(source, ranges) {
        const existing = this.hiddenAreas.get(source);
        if (existing && rangeArraysEqual(existing, ranges)) {
            return;
        }
        this.hiddenAreas.set(source, ranges);
        this.shouldRecompute = true;
    }
    /**
     * The returned array is immutable.
    */
    getMergedRanges() {
        if (!this.shouldRecompute) {
            return this.ranges;
        }
        this.shouldRecompute = false;
        const newRanges = Array.from(this.hiddenAreas.values()).reduce((r, hiddenAreas) => mergeLineRangeArray(r, hiddenAreas), []);
        if (rangeArraysEqual(this.ranges, newRanges)) {
            return this.ranges;
        }
        this.ranges = newRanges;
        return this.ranges;
    }
}
function mergeLineRangeArray(arr1, arr2) {
    const result = [];
    let i = 0;
    let j = 0;
    while (i < arr1.length && j < arr2.length) {
        const item1 = arr1[i];
        const item2 = arr2[j];
        if (item1.endLineNumber < item2.startLineNumber - 1) {
            result.push(arr1[i++]);
        }
        else if (item2.endLineNumber < item1.startLineNumber - 1) {
            result.push(arr2[j++]);
        }
        else {
            const startLineNumber = Math.min(item1.startLineNumber, item2.startLineNumber);
            const endLineNumber = Math.max(item1.endLineNumber, item2.endLineNumber);
            result.push(new Range(startLineNumber, 1, endLineNumber, 1));
            i++;
            j++;
        }
    }
    while (i < arr1.length) {
        result.push(arr1[i++]);
    }
    while (j < arr2.length) {
        result.push(arr2[j++]);
    }
    return result;
}
function rangeArraysEqual(arr1, arr2) {
    if (arr1.length !== arr2.length) {
        return false;
    }
    for (let i = 0; i < arr1.length; i++) {
        if (!arr1[i].equalsRange(arr2[i])) {
            return false;
        }
    }
    return true;
}
/**
 * Maintain a stable viewport by trying to keep the first line in the viewport constant.
 */
class StableViewport {
    constructor(viewportStartModelPosition, startLineDelta) {
        this.viewportStartModelPosition = viewportStartModelPosition;
        this.startLineDelta = startLineDelta;
    }
    recoverViewportStart(coordinatesConverter, viewLayout) {
        if (!this.viewportStartModelPosition) {
            return;
        }
        const viewPosition = coordinatesConverter.convertModelPositionToViewPosition(this.viewportStartModelPosition);
        const viewPositionTop = viewLayout.getVerticalOffsetForLineNumber(viewPosition.lineNumber);
        viewLayout.setScrollPosition({ scrollTop: viewPositionTop + this.startLineDelta }, 1 /* ScrollType.Immediate */);
    }
}
