mirror of https://github.com/vector-im/riot-web
142 lines
4.7 KiB
TypeScript
142 lines
4.7 KiB
TypeScript
/*
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Copyright 2019 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import EditorModel from "./model";
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import DocumentPosition, { Predicate } from "./position";
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import { Part } from "./parts";
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const whitespacePredicate: Predicate = (index, offset, part) => {
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return part.text[offset].trim() === "";
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};
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export default class Range {
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private _start: DocumentPosition;
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private _end: DocumentPosition;
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private _lastStart: DocumentPosition;
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private _initializedEmpty: boolean;
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constructor(public readonly model: EditorModel, positionA: DocumentPosition, positionB = positionA) {
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const bIsLarger = positionA.compare(positionB) < 0;
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this._start = bIsLarger ? positionA : positionB;
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this._end = bIsLarger ? positionB : positionA;
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this._lastStart = this._start;
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this._initializedEmpty = this._start.index === this._end.index && this._start.offset == this._end.offset;
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}
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public moveStartForwards(delta: number): void {
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this._start = this._start.forwardsWhile(this.model, () => {
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delta -= 1;
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return delta >= 0;
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});
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}
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public wasInitializedEmpty(): boolean {
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return this._initializedEmpty;
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}
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public setWasEmpty(value: boolean) {
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this._initializedEmpty = value;
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}
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public getLastStartingPosition(): DocumentPosition {
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return this._lastStart;
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}
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public setLastStartingPosition(position: DocumentPosition): void {
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this._lastStart = position;
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}
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public moveEndBackwards(delta: number): void {
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this._end = this._end.backwardsWhile(this.model, () => {
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delta -= 1;
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return delta >= 0;
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});
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}
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public trim(): void {
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if (this.text.trim() === "") {
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this._start = this._end;
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return;
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}
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this._start = this._start.forwardsWhile(this.model, whitespacePredicate);
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this._end = this._end.backwardsWhile(this.model, whitespacePredicate);
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}
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public expandBackwardsWhile(predicate: Predicate): void {
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this._start = this._start.backwardsWhile(this.model, predicate);
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}
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public expandForwardsWhile(predicate: Predicate): void {
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this._end = this._end.forwardsWhile(this.model, predicate);
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}
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public get text(): string {
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let text = "";
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this._start.iteratePartsBetween(this._end, this.model, (part, startIdx, endIdx) => {
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const t = part.text.substring(startIdx, endIdx);
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text = text + t;
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});
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return text;
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}
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/**
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* Splits the model at the range boundaries and replaces with the given parts.
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* Should be run inside a `model.transform()` callback.
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* @param {Part[]} parts the parts to replace the range with
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* @return {Number} the net amount of characters added, can be negative.
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*/
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public replace(parts: Part[]): number {
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const newLength = parts.reduce((sum, part) => sum + part.text.length, 0);
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let oldLength = 0;
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this._start.iteratePartsBetween(this._end, this.model, (part, startIdx, endIdx) => {
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oldLength += endIdx - startIdx;
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});
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this.model.replaceRange(this._start, this._end, parts);
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return newLength - oldLength;
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}
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/**
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* Returns a copy of the (partial) parts within the range.
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* For partial parts, only the text is adjusted to the part that intersects with the range.
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*/
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public get parts(): Part[] {
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const parts: Part[] = [];
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this._start.iteratePartsBetween(this._end, this.model, (part, startIdx, endIdx) => {
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const serializedPart = part.serialize();
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serializedPart.text = part.text.substring(startIdx, endIdx);
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const newPart = this.model.partCreator.deserializePart(serializedPart);
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parts.push(newPart);
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});
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return parts;
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}
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public get length(): number {
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let len = 0;
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this._start.iteratePartsBetween(this._end, this.model, (part, startIdx, endIdx) => {
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len += endIdx - startIdx;
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});
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return len;
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}
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public get start(): DocumentPosition {
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return this._start;
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}
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public get end(): DocumentPosition {
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return this._end;
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}
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}
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