Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import {Anchor} from '../rga/constants';
import {formatType} from '../slice/util';
import {EditorSlices} from './EditorSlices';
import {next, prev} from 'sonic-forest/lib/util';
import {printTree} from 'tree-dump/lib/printTree';
import {createRegistry} from '../registry/registry';
import {PersistedSlice} from '../slice/PersistedSlice';
import {stringify} from '../../../json-text/stringify';
import {CommonSliceType, type SliceTypeSteps, type SliceType, type SliceTypeStep} from '../slice';
import {isLetter, isPunctuation, isWhitespace, stepsEqual} from './util';
import {ValueSyncStore} from '../../../util/events/sync-store';
import {MarkerOverlayPoint} from '../overlay/MarkerOverlayPoint';
import {UndefEndIter, type UndefIterator} from '../../../util/iterator';
import {tick, Timespan, type ITimespanStruct} from '../../../json-crdt-patch';
import {CursorAnchor, SliceBehavior, SliceHeaderMask, SliceHeaderShift, SliceTypeCon} from '../slice/constants';
import type {Point} from '../rga/Point';
import type {Range} from '../rga/Range';
import type {Printable} from 'tree-dump';
import type {Peritext} from '../Peritext';
import type {ChunkSlice} from '../util/ChunkSlice';
import type {MarkerSlice} from '../slice/MarkerSlice';
import type {SliceRegistry} from '../registry/SliceRegistry';
import type {
CharIterator,
CharPredicate,
EditorPosition,
TextRangeUnit,
ViewStyle,
ViewRange,
ViewSlice,
EditorUi,
EditorSelection,
} from './types';
/**
* For inline boolean ("Overwrite") slices, both range endpoints should be
* attached to {@link Anchor.Before} as per the Peritext paper. This way, say
* bold text, automatically extends to include the next character typed as
* user types.
*
* @param range The range to be adjusted.
*/
const makeRangeExtendable = <T>(range: Range<T>): void => {
Iif (range.end.anchor !== Anchor.Before || range.start.anchor !== Anchor.Before) {
const start = range.start.clone();
const end = range.end.clone();
start.refBefore();
end.refBefore();
range.set(start, end);
}
};
export class Editor<T = string> implements Printable {
public readonly saved: EditorSlices<T>;
public readonly extra: EditorSlices<T>;
public readonly local: EditorSlices<T>;
/**
* Formatting which will be applied to the next inserted text. This is a
* temporary store for formatting which is not yet applied to the text, but
* will be if the cursor is not moved.
*/
public readonly pending = new ValueSyncStore<Map<CommonSliceType | string | number, unknown>>(new Map());
public registry: SliceRegistry = createRegistry();
constructor(public readonly txt: Peritext<T>) {
this.saved = new EditorSlices(txt, txt.savedSlices);
this.extra = new EditorSlices(txt, txt.extraSlices);
this.local = new EditorSlices(txt, txt.localSlices);
}
public text(): string {
return this.txt.strApi().view();
}
// ------------------------------------------------------------------ cursors
public addCursor(range: Range<T> = this.txt.rangeAt(0), anchor: CursorAnchor = CursorAnchor.Start): Cursor<T> {
const cursor = this.txt.localSlices.ins<Cursor<T>, typeof Cursor>(
range,
SliceBehavior.Cursor,
anchor,
undefined,
Cursor,
);
return cursor;
}
/**
* Cursor is the the current user selection. It can be a caret or a range. If
* range is collapsed to a single point, it is a *caret*.
*
* Returns the first cursor in the text and removes all other cursors. If
* there is no cursor, creates one and inserts it at the start of the text.
* To work with multiple cursors, use `.cursors()` method.
*/
public get cursor(): Cursor<T> {
let cursor: Cursor<T> | undefined;
for (let i: Cursor<T> | undefined, iterator = this.cursors0(); (i = iterator()); )
if (!cursor) cursor = i;
else this.local.del(i);
return cursor ?? this.addCursor();
}
public cursors0(): UndefIterator<Cursor<T>> {
const iterator = this.txt.localSlices.iterator0();
return () => {
while (true) {
const slice = iterator();
if (slice instanceof Cursor) return slice;
if (!slice) return;
}
};
}
public mainCursor(): Cursor<T> | undefined {
return this.cursors0()();
}
public cursors() {
return new UndefEndIter(this.cursors0());
}
public forCursor(callback: (cursor: Cursor<T>) => void): void {
for (let cursor: Cursor<T> | undefined, i = this.cursors0(); (cursor = i()); ) callback(cursor);
}
/**
* @returns Returns `true` if there is at least one cursor in the document.
*/
public hasCursor(): boolean {
return !!this.cursors0()();
}
/**
* Returns the first cursor in the document, if any.
*
* @returns Returns the first cursor in the document, or `undefined` if there
* are no cursors.
*/
public getCursor(): undefined | Cursor<T> {
return this.hasCursor() ? this.cursor : void 0;
}
/**
* @returns Returns the exact number of cursors in the document.
*/
public cursorCount(): number {
let cnt = 0;
for (const i = this.cursors0(); i(); ) cnt++;
return cnt;
}
/**
* Returns relative count of cursors (cardinality).
*
* @returns 0 if there are no cursors, 1 if there is exactly one cursor, 2 if
* there are more than one cursor.
*/
public cursorCard(): 0 | 1 | 2 {
const i = this.cursors0();
return !i() ? 0 : !i() ? 1 : 2;
}
public delCursor(cursor: Cursor<T>): void {
this.local.del(cursor);
}
public delCursors(): void {
for (let cursor: Cursor<T> | undefined, i = this.cursors0(); (cursor = i()); ) this.delCursor(cursor);
}
/**
* Ensures there is no range selection. If user has selected a range,
* the contents is removed and the cursor is set at the start of the range
* as caret.
*/
public collapseCursor(cursor: Range<T>): void {
this.delRange(cursor);
cursor.collapseToStart();
}
public collapseCursors(): void {
for (let i = this.cursors0(), cursor = i(); cursor; cursor = i()) this.collapseCursor(cursor);
}
// ------------------------------------------------------------- text editing
/**
* Ensures there is exactly one cursor. If the cursor is a range, contents
* inside the range is deleted and cursor is collapsed to a single point.
*
* @returns A single cursor collapsed to a single point.
*/
public caret(): Cursor<T> {
const cursor = this.cursor;
Iif (!cursor.isCollapsed()) this.delRange(cursor);
return cursor;
}
/**
* Insert inline text at current cursor position. If cursor selects a range,
* the range is removed and the text is inserted at the start of the range.
*/
public insert0(range: Range<T>, text: string): ITimespanStruct | undefined {
Iif (!text) return;
if (!range.isCollapsed()) this.delRange(range);
const after = range.start.clone();
after.refAfter();
const txt = this.txt;
const textId = txt.ins(after.id, text);
const span = new Timespan(textId.sid, textId.time, text.length);
const shift = text.length - 1;
const point = txt.point(shift ? tick(textId, shift) : textId, Anchor.After);
if (range instanceof Cursor) range.set(point, point, CursorAnchor.Start);
else Erange.set(point);
return span;
}
/**
* Inserts text at the cursor positions and collapses cursors, if necessary.
* Then applies any pending inline formatting to the inserted text.
*/
public insert(text: string, ranges?: IterableIterator<Range<T>> | Range<T>[]): ITimespanStruct[] {
const spans: ITimespanStruct[] = [];
if (!ranges) {
if (!this.hasCursor()) this.addCursor();
ranges = this.cursors();
}
Iif (!ranges) return [];
for (const range of ranges) {
const span = this.insert0(range, text);
if (span) spans.push(span);
const pending = this.pending.value;
Iif (pending.size) {
this.pending.next(new Map());
const start = range.start.clone();
start.step(-text.length);
const toggleRange = this.txt.range(start, range.end.clone());
for (const [type, data] of pending) this.toggleRangeExclFmt(toggleRange, type, data);
}
}
return spans;
}
/**
* Deletes the previous character at current cursor positions. If cursors
* select a range, deletes the whole range.
*/
public del(step: number = -1): void {
this.delete(step, 'char');
}
public delRange(range: Range<T>): void {
const txt = this.txt;
const overlay = txt.overlay;
const contained = overlay.findContained(range);
for (const slice of contained)
Iif (slice instanceof PersistedSlice && slice.behavior !== SliceBehavior.Cursor) slice.del();
txt.delStr(range);
}
/**
* Deletes one or more units of text in all cursors. If cursor is a range,
* deletes the whole range.
*
* @param step Number of units to delete.
* @param unit A unit of deletion: "char", "word", "line".
*/
public delete(step: number, unit: 'char' | 'word' | 'line'): void {
const txt = this.txt;
for (let i = this.cursors0(), cursor = i(); cursor; cursor = i()) {
if (!cursor.isCollapsed()) {
this.collapseCursor(cursor);
return;
}
let point1 = cursor.start.clone();
let point2 = point1.clone();
Iif (step > 0) point2 = this.skip(point2, step, unit);
else if (step < 0) point1 = this.skip(point1, step, unit);
else IEif (step === 0) {
point1 = this.skip(point1, -1, unit);
point2 = this.skip(point2, 1, unit);
}
const range = txt.range(point1, point2);
this.delRange(range);
point1.refAfter();
cursor.set(point1);
}
}
// ----------------------------------------------------------------- movement
/**
* Returns an iterator through visible text, one `step`, one character at a
* time, starting from a given {@link Point}.
*
* @param start The starting point.
* @param step Number of visible characters to skip.
* @returns The next visible character iterator.
*/
public walk(start: Point<T>, step: number = 1): CharIterator<T> {
let point: Point<T> | undefined = start.clone();
return () => {
if (!point) return;
const char = step > 0 ? point.rightChar() : point.leftChar();
if (!char) return (point = undefined);
const end = point.step(step);
if (end) point = undefined;
return char;
};
}
/**
* Returns a forward iterator through visible text, one character at a time,
* starting from a given {@link Point}.
*
* @param start The starting point.
* @param chunk Chunk to start from.
* @returns The next visible character iterator.
*/
public fwd(start: Point<T>): CharIterator<T> {
return this.walk(start, 1);
}
/**
* Returns a backward iterator through visible text, one character at a time,
* starting from a given {@link Point}.
*
* @param start The starting point.
* @param chunk Chunk to start from.
* @returns The previous visible character iterator.
*/
public bwd(start: Point<T>): CharIterator<T> {
return this.walk(start, -1);
}
/**
* Skips a word in an arbitrary direction. A word is defined by the `predicate`
* function, which returns `true` if the character is part of the word.
*
* @param iterator Character iterator.
* @param predicate Predicate function to match characters, returns `true` if
* the character is part of the word.
* @param firstLetterFound Whether the first letter has already been found. If
* not, will skip any characters until the first letter, which is matched
* by the `predicate` is found.
* @returns Point after the last skipped character.
*/
private skipWord(
iterator: CharIterator<T>,
predicate: CharPredicate<string>,
firstLetterFound: boolean,
): Point<T> | undefined {
let next: ChunkSlice<T> | undefined;
let prev: ChunkSlice<T> | undefined;
while ((next = iterator())) {
const char = (next.view() as string)[0];
if (firstLetterFound) {
if (!predicate(char)) break;
} else if (predicate(char)) firstLetterFound = true;
prev = next;
}
if (!prev) return;
return this.txt.point(prev.id(), Anchor.After);
}
/**
* Hard skips line, skips to the next "\n" newline character.
*
* @param iterator Character iterator.
* @returns Point after the last skipped character.
*/
private skipLine(iterator: CharIterator<T>): Point<T> | undefined {
let next: ChunkSlice<T> | undefined;
let prev: ChunkSlice<T> | undefined;
while ((next = iterator())) {
const char = (next.view() as string)[0];
if (char === '\n') break;
prev = next;
}
if (!prev) return;
return this.txt.point(prev.id(), Anchor.After);
}
/**
* End of word iterator (eow). Skips a word forward. A word is defined by the
* `predicate` function, which returns `true` if the character is part of the
* word.
*
* @param point Point from which to start skipping.
* @param predicate Character class to skip.
* @param firstLetterFound Whether the first letter has already been found. If
* not, will skip any characters until the first letter, which is
* matched by the `predicate` is found.
* @returns Point after the last character skipped.
*/
public eow(
point: Point<T>,
predicate: CharPredicate<string> = isLetter,
firstLetterFound: boolean = false,
): Point<T> {
return this.skipWord(this.fwd(point), predicate, firstLetterFound) || point;
}
/**
* Beginning of word iterator (bow). Skips a word backward. A word is defined
* by the `predicate` function, which returns `true` if the character is part
* of the word.
*
* @param point Point from which to start skipping.
* @param predicate Character class to skip.
* @param firstLetterFound Whether the first letter has already been found. If
* not, will skip any characters until the first letter, which is
* matched by the `predicate` is found.
* @returns Point after the last character skipped.
*/
public bow(
point: Point<T>,
predicate: CharPredicate<string> = isLetter,
firstLetterFound: boolean = false,
): Point<T> {
const bwd = this.bwd(point);
const endPoint = this.skipWord(bwd, predicate, firstLetterFound);
if (endPoint) endPoint.anchor = Anchor.Before;
return endPoint || point;
}
/** Find end of line, starting from given point. */
public eol(point: Point<T>): Point<T> {
return this.skipLine(this.fwd(point)) || this.end();
}
/** Find beginning of line, starting from given point. */
public bol(point: Point<T>): Point<T> {
const bwd = this.bwd(point);
const endPoint = this.skipLine(bwd);
if (endPoint) endPoint.anchor = Anchor.Before;
return endPoint || this.start();
}
/**
* Find end of block, starting from given point. Overlay should be refreshed
* before calling this method.
*/
public eob(point: Point<T>): Point<T> {
const txt = this.txt;
const overlay = txt.overlay;
point = point.clone();
point.halfstep(1);
if (point.isAbsEnd()) return point;
let overlayPoint = overlay.getOrNextHigher(point);
if (!overlayPoint) return this.end();
if (point.cmp(overlayPoint) === 0) overlayPoint = next(overlayPoint);
while (!(overlayPoint instanceof MarkerOverlayPoint) && overlayPoint) overlayPoint = next(overlayPoint);
if (overlayPoint instanceof MarkerOverlayPoint) {
const point = overlayPoint.clone();
point.refAfter();
return point;
} else return this.end();
}
/**
* Find beginning of block, starting from given point. Overlay should be
* refreshed before calling this method.
*/
public bob(point: Point<T>): Point<T> {
const overlay = this.txt.overlay;
point = point.clone();
point.halfstep(-1);
if (point.isAbsStart()) return point;
let overlayPoint = overlay.getOrNextLower(point);
if (!overlayPoint) return this.start();
while (!(overlayPoint instanceof MarkerOverlayPoint) && overlayPoint) overlayPoint = prev(overlayPoint);
if (overlayPoint instanceof MarkerOverlayPoint) {
const point = overlayPoint.clone();
point.refBefore();
return point;
} else return this.start();
}
/**
* Move a point given number of steps in a specified direction. The unit of
* one move step is defined by the `unit` parameter.
*
* @param point The point to start from.
* @param steps Number of steps to move. Negative number moves backward.
* @param unit The unit of move per step: "char", "word", "line", etc.
* @returns The destination point after the move.
*/
public skip(point: Point<T>, steps: number, unit: TextRangeUnit, ui?: EditorUi<T>): Point<T> {
Iif (!steps) return point;
switch (unit) {
case 'point': {
const p = point.clone();
return p.halfstep(steps), p;
}
case 'char': {
const p = point.clone();
return p.step(steps), p;
}
case 'word': {
if (steps > 0) for (let i = 0; i < steps; i++) point = this.eow(point);
else for (let i = 0; i < -steps; i++) point = this.bow(point);
return point;
}
case 'line': {
if (steps > 0) for (let i = 0; i < steps; i++) point = this.eol(point);
else for (let i = 0; i < -steps; i++) point = this.bol(point);
return point;
}
case 'vline': {
if (steps > 0) for (let i = 0; i < steps; i++) point = ui?.eol?.(point, 1) ?? this.eol(point);
else for (let i = 0; i < -steps; i++) point = ui?.eol?.(point, -1) ?? this.bol(point);
return point;
}
case 'vert': {
return ui?.vert?.(point, steps) || point;
}
case 'block': {
if (steps > 0) for (let i = 0; i < steps; i++) point = this.eob(point);
else for (let i = 0; i < -steps; i++) point = this.bob(point);
return point;
}
case 'all':
return steps > 0 ? this.end() : this.start();
}
}
/**
* Move all cursors given number of units.
*
* @param steps Number of steps to move.
* @param unit The unit of move per step: "char", "word", "line".
* @param endpoint 0 for "focus", 1 for "anchor", 2 for both.
* @param collapse Whether to collapse the range to a single point.
*/
public move(
steps: number,
unit: TextRangeUnit,
endpoint: 0 | 1 | 2 = 0,
collapse: boolean = true,
ui?: EditorUi<T>,
): void {
this.forCursor((cursor) => {
switch (endpoint) {
case 0: {
let point = cursor.focus();
point = this.skip(point, steps, unit, ui);
Iif (collapse) cursor.set(point);
else cursor.setEndpoint(point, 0);
break;
}
case 1: {
let point = cursor.anchor();
point = this.skip(point, steps, unit, ui);
Iif (collapse) cursor.set(point);
else cursor.setEndpoint(point, 1);
break;
}
case 2: {
const start = this.skip(cursor.start, steps, unit, ui);
const end = collapse ? start.clone() : this.skip(cursor.end, steps, unit, ui);
cursor.set(start, end);
break;
}
}
});
}
// ---------------------------------------------------------------- selection
/**
* Leaves only the first cursor, and sets it selection to the whole text.
*
* @returns Returns `true` if the selection was successful.
*/
public selectAll(): boolean {
const range = this.txt.rangeAll();
Iif (!range) return false;
this.cursor.setRange(range);
return true;
}
/**
* Selects a word by extending the selection to the left and right of the point.
*
* @param point Point to the right of which is the starting character of the word.
* @returns Range which contains the word.
*/
public rangeWord(point: Point<T>): Range<T> | undefined {
const char = point.rightChar() || point.leftChar();
Iif (!char) return;
const c = String(char.view())[0];
const predicate: CharPredicate<string> = isLetter(c) ? isLetter : isWhitespace(c) ? isWhitespace : isPunctuation;
const start = this.bow(point, predicate, true);
const end = this.eow(point, predicate, true);
return this.txt.range(start, end);
}
/**
* Returns a range by expanding the selection to the left and right of the
* given point.
*
* @param point Point from which to start range expansion.
* @param unit Unit of the range expansion.
* @returns Range which contains the specified unit.
*/
public range(point: Point<T>, unit: TextRangeUnit, ui?: EditorUi<T>): Range<T> | undefined {
if (unit === 'word') return this.rangeWord(point);
const point1 = this.skip(point, -1, unit, ui);
const point2 = this.skip(point, 1, unit, ui);
return this.txt.range(point1, point2);
}
public select(unit: TextRangeUnit, ui?: EditorUi<T>): void {
this.forCursor((cursor) => {
const range = this.range(cursor.start, unit, ui);
if (range) cursor.set(range.start, range.end, CursorAnchor.Start);
else Ethis.delCursors;
});
}
public selectAt(at: EditorPosition<T>, unit: TextRangeUnit | '', ui?: EditorUi<T>): void {
this.cursor.set(this.pos2point(at));
if (unit) this.select(unit, ui);
}
// --------------------------------------------------------------- formatting
public eraseFormatting(
store: EditorSlices<T> = this.saved,
selection: Range<T>[] | IterableIterator<Range<T>> = this.cursors(),
): void {
const overlay = this.txt.overlay;
for (const range of selection) {
overlay.refresh();
const contained = overlay.findContained(range);
for (const slice of contained) {
Iif (slice instanceof PersistedSlice) {
switch (slice.behavior) {
case SliceBehavior.One:
case SliceBehavior.Many:
case SliceBehavior.Erase:
slice.del();
}
}
}
overlay.refresh();
const overlapping = overlay.findOverlapping(range);
for (const slice of overlapping) {
switch (slice.behavior) {
case SliceBehavior.One:
case SliceBehavior.Many: {
store.insErase(slice.type);
}
}
}
}
}
public clearFormatting(
store: EditorSlices<T> = this.saved,
selection: Range<T>[] | IterableIterator<Range<T>> = this.cursors(),
): void {
const overlay = this.txt.overlay;
overlay.refresh();
for (const range of selection) {
const overlapping = overlay.findOverlapping(range);
for (const slice of overlapping) store.del(slice.id);
}
}
// -------------------------------------------------------- inline formatting
protected toggleRangeExclFmt(
range: Range<T>,
type: CommonSliceType | string | number,
data?: unknown,
store: EditorSlices<T> = this.saved,
): void {
Iif (range.isCollapsed()) throw new Error('Range is collapsed');
const txt = this.txt;
const overlay = txt.overlay;
const [complete] = overlay.stat(range, 1e6);
const needToRemoveFormatting = complete.has(type);
makeRangeExtendable(range);
const contained = overlay.findContained(range);
for (const slice of contained) Iif (slice instanceof PersistedSlice && slice.type === type) slice.del();
Iif (needToRemoveFormatting) {
overlay.refresh();
const [complete2, partial2] = overlay.stat(range, 1e6);
const needsErase = complete2.has(type) || partial2.has(type);
Iif (needsErase) store.slices.insErase(range, type);
} else {
Iif (range.start.isAbs()) {
const start = txt.pointStart();
Iif (!start) return;
Iif (start.cmpSpatial(range.end) >= 0) return;
range.start = start;
}
Iif (range.end.isAbs()) {
const end = txt.pointEnd();
Iif (!end) return;
Iif (end.cmpSpatial(range.start) <= 0) return;
range.end = end;
}
store.slices.insOne(range, type, data);
}
}
public toggleExclFmt(
type: CommonSliceType | string | number,
data?: unknown,
store: EditorSlices<T> = this.saved,
selection: Range<T>[] | IterableIterator<Range<T>> = this.cursors(),
): void {
// TODO: handle mutually exclusive slices (<sub>, <sub>)
this.txt.overlay.refresh();
SELECTION: for (const range of selection) {
Iif (range.isCollapsed()) {
const pending = this.pending.value;
if (pending.has(type)) pending.delete(type);
else pending.set(type, data);
this.pending.next(pending);
continue SELECTION;
}
this.toggleRangeExclFmt(range, type, data, store);
}
}
// --------------------------------------------------------- block formatting
/**
* Returns block split marker of the block inside which the point is located.
*
* @param point The point to get the marker at.
* @returns The split marker at the point, if any.
*/
public getMarker(point: Point<T>): MarkerSlice<T> | undefined {
return this.txt.overlay.getOrNextLowerMarker(point)?.marker;
}
/**
* Returns the block type at the given point. Block type is a nested array of
* tags, e.g. `['p']`, `['blockquote', 'p']`, `['ul', 'li', 'p']`, etc.
*
* @param point The point to get the block type at.
* @returns Current block type at the point.
*/
public getBlockType(point: Point<T>): [type: SliceTypeSteps, marker?: MarkerSlice<T> | undefined] {
const marker = this.getMarker(point);
Iif (!marker) return [[SliceTypeCon.p]];
let steps = marker?.type ?? [SliceTypeCon.p];
Iif (!Array.isArray(steps)) steps = [steps];
return [steps, marker];
}
/**
* Insert a block split at the start of the document. The start of the
* document is defined as immediately after all deleted characters starting
* from the beginning of the document, or as the ABS start of the document if
* there are no deleted characters.
*
* @param type The type of the marker.
* @returns The inserted marker slice.
*/
public insStartMarker(type: SliceType): MarkerSlice<T> {
const txt = this.txt;
const start = txt.pointStart() ?? txt.pointAbsStart();
start.refAfter();
return this.txt.savedSlices.insMarkerAfter(start.id, type);
}
/**
* Find the block split marker which contains the point and sets the block
* type of the marker. If there is no block split marker at the point, a new
* block split marker is inserted at the beginning of the document with the
* specified block type.
*
* @param point The point at which to set the block type.
* @param type The new block type.
* @returns The marker slice at the point, or a new marker slice if there is none.
*/
public setBlockType(point: Point<T>, type: SliceType): MarkerSlice<T> {
const marker = this.getMarker(point);
if (marker) {
marker.update({type});
return marker;
}
return this.insStartMarker(type);
}
public getContainerPath(steps: SliceTypeSteps): SliceTypeSteps {
const registry = this.registry;
const length = steps.length;
for (let i = length - 1; i >= 0; i--) {
const step = steps[i];
const tag = Array.isArray(step) ? step[0] : step;
const isContainer = registry.isContainer(tag);
if (isContainer) return steps.slice(0, i + 1);
}
return [];
}
public getDeepestCommonContainer(steps1: SliceTypeSteps, steps2: SliceTypeSteps): number {
const length1 = steps1.length;
const length2 = steps2.length;
const min = Math.min(length1, length2);
for (let i = 0; i < min; i++) {
const step1 = steps1[i];
const step2 = steps2[i];
const tag1 = Array.isArray(step1) ? step1[0] : step1;
const tag2 = Array.isArray(step2) ? step2[0] : step2;
const disc1 = Array.isArray(step1) ? step1[1] : 0;
const disc2 = Array.isArray(step2) ? step2[1] : 0;
if (tag1 !== tag2 || disc1 !== disc2) return i - 1;
if (!this.registry.isContainer(tag1)) return i - 1;
}
return min;
}
/**
* @param at Point at which split block split happens.
* @param slices The slices set to use.
* @returns True if a marker was inserted, false if it was updated.
*/
public splitAt(at: Point<T>, slices: EditorSlices<T> = this.saved): boolean {
const [type, marker] = this.getBlockType(at);
const prevMarker = marker ? this.getMarker(marker.start.copy((p) => p.halfstep(-1))) : void 0;
if (marker && prevMarker) {
const rangeFromMarker = this.txt.range(marker.start, at);
const noLeadingText = rangeFromMarker.length() <= 1;
if (noLeadingText) {
const markerSteps = marker.typeSteps();
const prevMarkerSteps = prevMarker.typeSteps();
if (markerSteps.length > 1) {
const areMarkerTypesEqual = stepsEqual(markerSteps, prevMarkerSteps);
if (areMarkerTypesEqual) {
const i = this.getDeepestCommonContainer(markerSteps, prevMarkerSteps);
if (i >= 0) {
const newType = [...markerSteps];
const step = newType[i];
const tag = Array.isArray(step) ? step[0] : step;
const disc = Array.isArray(step) ? step[1] : 0;
newType[i] = [tag, (disc + 1) % 8];
marker.update({type: newType});
return false;
}
}
}
}
}
const containerPath = this.getContainerPath(type);
const newType = containerPath.concat([CommonSliceType.p]);
slices.insMarker(newType);
return true;
}
public split(
type?: SliceType,
data?: unknown,
selection: Range<T>[] | IterableIterator<Range<T>> = this.cursors(),
slices: EditorSlices<T> = this.saved,
): void {
if (type === void 0) {
for (const range of selection) {
this.collapseCursor(range);
const didInsertMarker = this.splitAt(range.start, slices);
if (didInsertMarker && range instanceof Cursor) range.move(1);
}
} else {
for (const range of selection) {
this.collapseCursor(range);
Iif (type === void 0) {
// TODO: detect current block type
type = CommonSliceType.p;
}
slices.insMarker(type, data);
if (range instanceof Cursor) range.move(1);
}
}
}
public setStartMarker(type: SliceType, data?: unknown, slices: EditorSlices<T> = this.saved): MarkerSlice<T> {
const after = this.txt.pointStart() ?? this.txt.pointAbsStart();
after.refAfter();
Iif (Array.isArray(type) && type.length === 1) type = type[0];
return slices.slices.insMarkerAfter(after.id, type, data);
}
public tglMarkerAt(
point: Point<T>,
type: SliceType,
data?: unknown,
slices: EditorSlices<T> = this.saved,
def: SliceTypeStep = SliceTypeCon.p,
): void {
const overlay = this.txt.overlay;
const markerPoint = overlay.getOrNextLowerMarker(point);
if (markerPoint) {
const marker = markerPoint.marker;
const tag = marker.tag();
Iif (!Array.isArray(type)) type = [type];
const typeTag = type[type.length - 1];
Iif (tag === typeTag) type = [...type.slice(0, -1), def];
Iif (Array.isArray(type) && type.length === 1) type = type[0];
marker.update({type});
} else this.setStartMarker(type, data, slices);
}
public updMarkerAt(point: Point<T>, type: SliceType, data?: unknown, slices: EditorSlices<T> = this.saved): void {
const overlay = this.txt.overlay;
const markerPoint = overlay.getOrNextLowerMarker(point);
if (markerPoint) {
const marker = markerPoint.marker;
Iif (Array.isArray(type) && type.length === 1) type = type[0];
marker.update({type});
} else this.setStartMarker(type, data, slices);
}
/**
* Toggle the type of a block split between the slice type and the default
* (paragraph) block type.
*
* @param type Slice type to toggle.
* @param data Custom data of the slice.
*/
public tglMarker(
type: SliceType,
data?: unknown,
selection: Range<T>[] | IterableIterator<Range<T>> = this.cursors(),
slices: EditorSlices<T> = this.saved,
def: SliceTypeStep = SliceTypeCon.p,
): void {
for (const range of selection) this.tglMarkerAt(range.start, type, data, slices, def);
}
/**
* Update the type of a block split at all cursor positions.
*
* @param type Slice type to set.
* @param data Custom data of the slice.
* @param slices The slices set to use, if new marker is inserted at the start
* of the document.
*/
public updMarker(
type: SliceType,
data?: unknown,
selection: Range<T>[] | IterableIterator<Range<T>> = this.cursors(),
slices: EditorSlices<T> = this.saved,
): void {
for (const range of selection) this.updMarkerAt(range.start, type, data, slices);
}
public delMarker(selection: Range<T>[] | IterableIterator<Range<T>> = this.cursors()): void {
const markerPoints = new Set<MarkerOverlayPoint<T>>();
for (const range of selection) {
const markerPoint = this.txt.overlay.getOrNextLowerMarker(range.start);
Iif (markerPoint) markerPoints.add(markerPoint);
}
for (const markerPoint of markerPoints) {
const boundary = markerPoint.marker.boundary();
this.delRange(boundary);
}
}
// ---------------------------------------------------------- export / import
public export(range: Range<T>): ViewRange {
const r = range.range();
r.start.refBefore();
r.end.refAfter();
const text = r.text();
const offset = r.start.viewPos();
const viewSlices: ViewSlice[] = [];
const view: ViewRange = [text, offset, viewSlices];
const txt = this.txt;
const overlay = txt.overlay;
const slices = overlay.findOverlapping(r);
for (const slice of slices) {
const isSavedSlice = slice.id.sid === txt.model.clock.sid;
if (!isSavedSlice) continue;
const behavior = slice.behavior;
switch (behavior) {
case SliceBehavior.One:
case SliceBehavior.Many:
case SliceBehavior.Erase:
case SliceBehavior.Marker: {
const {behavior, type, start, end} = slice;
const header: number =
(behavior << SliceHeaderShift.Behavior) +
(start.anchor << SliceHeaderShift.X1Anchor) +
(end.anchor << SliceHeaderShift.X2Anchor);
const viewSlice: ViewSlice = [header, start.viewPos(), end.viewPos(), type];
const data = slice.data();
Iif (data !== void 0) viewSlice.push(data);
viewSlices.push(viewSlice);
}
}
}
return view;
}
/**
* "Copy formatting-only", copies inline formatting applied to the selected
* range.
*
* @param range Range copy formatting from, normally a single visible character.
* @returns A list of serializable inline formatting applied to the selected range.
*/
public exportStyle(range: Range<T>): ViewStyle[] {
const formatting: ViewStyle[] = [];
const txt = this.txt;
const overlay = txt.overlay;
const slices = overlay.findOverlapping(range);
for (const slice of slices) {
const isSavedSlice = slice.id.sid === txt.model.clock.sid;
if (!isSavedSlice) continue;
Iif (!slice.contains(range)) continue;
const behavior = slice.behavior;
switch (behavior) {
case SliceBehavior.One:
case SliceBehavior.Many:
case SliceBehavior.Erase: {
const sliceFormatting: ViewStyle = [behavior, slice.type];
const data = slice.data();
Iif (data !== void 0) sliceFormatting.push(data);
formatting.push(sliceFormatting);
}
}
}
return formatting;
}
public import(pos: number, view: ViewRange): number {
let [text, offset, slices] = view;
const txt = this.txt;
let removeFirstMarker = false;
const firstSlice = slices[0];
if (firstSlice) {
const [header, x1, , type] = firstSlice;
const behavior: SliceBehavior = (header & SliceHeaderMask.Behavior) >>> SliceHeaderShift.Behavior;
const isBlockSplitMarker = behavior === SliceBehavior.Marker;
if (isBlockSplitMarker) {
const markerStartsAtZero = x1 - offset === 0;
if (markerStartsAtZero) {
const point = txt.pointAt(pos);
const markerBefore = txt.overlay.getOrNextLowerMarker(point);
if (markerBefore) {
if (markerBefore.type() === type) removeFirstMarker = true;
} else {
if (type === CommonSliceType.p) removeFirstMarker = true;
}
}
}
}
if (removeFirstMarker) {
text = text.slice(1);
offset += 1;
slices = slices.slice(1);
}
const length = slices.length;
const splits: ViewSlice[] = [];
const annotations: ViewSlice[] = [];
const texts: string[] = [];
let curr = 0;
for (let i = 0; i < length; i++) {
const slice = slices[i];
const [header, x1] = slice;
const behavior: SliceBehavior = (header & SliceHeaderMask.Behavior) >>> SliceHeaderShift.Behavior;
const isBlockSplitMarker = behavior === SliceBehavior.Marker;
if (isBlockSplitMarker) {
const end = x1 - offset;
texts.push(text.slice(curr, end));
curr = end + 1;
splits.push(slice);
} else annotations.push(slice);
}
const lastText = text.slice(curr);
const splitLength = splits.length;
curr = pos;
for (let i = 0; i < splitLength; i++) {
const str = texts[i];
const split = splits[i];
if (str) {
txt.insAt(curr, str);
curr += str.length;
}
if (split) {
const [, , , type, data] = split;
const after = txt.pointAt(curr);
after.refAfter();
txt.savedSlices.insMarkerAfter(after.id, type, data);
curr += 1;
}
}
if (lastText) {
txt.insAt(curr, lastText);
curr += lastText.length;
}
const annotationsLength = annotations.length;
for (let i = 0; i < annotationsLength; i++) {
const slice = annotations[i];
const [header, x1, x2, type, data] = slice;
const anchor1: Anchor = (header & SliceHeaderMask.X1Anchor) >>> SliceHeaderShift.X1Anchor;
const anchor2: Anchor = (header & SliceHeaderMask.X2Anchor) >>> SliceHeaderShift.X2Anchor;
const behavior: SliceBehavior = (header & SliceHeaderMask.Behavior) >>> SliceHeaderShift.Behavior;
const x1Src = x1 - offset;
const x2Src = x2 - offset;
const x1Capped = Math.max(0, x1Src);
const x2Capped = Math.min(text.length, x2Src);
const x1Dest = x1Capped + pos;
const annotationLength = x2Capped - x1Capped;
const range = txt.rangeAt(x1Dest, annotationLength);
if (!!x1Dest && anchor1 === Anchor.After) range.start.refAfter();
// else range.start.refBefore();
if (anchor2 === Anchor.Before) range.end.refBefore();
// else range.end.refAfter();
if (range.end.isAbs()) range.end.refAfter();
txt.savedSlices.ins(range, behavior, type, data);
}
return curr - pos;
}
public importStyle(range: Range<T>, formatting: ViewStyle[]): void {
const txt = this.txt;
const length = formatting.length;
for (let i = 0; i < length; i++) {
const [behavior, type, data] = formatting[i];
txt.savedSlices.ins(range, behavior, type, data);
}
}
// ------------------------------------------------------------------ various
public pos2point(at: EditorPosition<T>): Point<T> {
const txt = this.txt;
return typeof at === 'number' ? txt.pointAt(at) : Array.isArray(at) ? txt.pointAt(at[0], at[1]) : at;
}
public sel2range(at: EditorSelection<T>): [range: Range<T>, anchor: CursorAnchor] {
Iif (!Array.isArray(at)) return [at, CursorAnchor.End];
const [pos1, pos2] = at;
const p1 = this.pos2point(pos1);
const txt = this.txt;
if (pos2 === undefined) {
p1.refAfter();
return [txt.range(p1), CursorAnchor.End];
}
const p2 = this.pos2point(pos2);
const range = txt.rangeFromPoints(p1, p2);
const anchor: CursorAnchor = range.start === p1 ? CursorAnchor.Start : CursorAnchor.End;
return [range, anchor];
}
public end(): Point<T> {
const txt = this.txt;
return txt.pointEnd() ?? txt.pointAbsEnd();
}
public start(): Point<T> {
const txt = this.txt;
return txt.pointStart() ?? txt.pointAbsStart();
}
// ---------------------------------------------------------------- Printable
public toString(tab: string = ''): string {
const pending = this.pending.value;
const pendingFormatted = {} as any;
for (const [type, data] of pending) pendingFormatted[formatType(type)] = data;
return (
'Editor' +
printTree(tab, [
(tab) =>
'cursors' +
printTree(
tab,
[...this.cursors()].map((cursor) => (tab) => cursor.toString(tab)),
),
() => `pending ${stringify(pendingFormatted)}`,
])
);
}
}
|