mirror of https://github.com/vector-im/riot-web
96 lines
3.0 KiB
JavaScript
96 lines
3.0 KiB
JavaScript
/*
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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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export default class Range {
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constructor(model, positionA, positionB = positionA) {
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this._model = model;
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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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}
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moveStart(delta) {
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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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expandBackwardsWhile(predicate) {
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this._start = this._start.backwardsWhile(this._model, predicate);
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}
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get model() {
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return this._model;
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}
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get text() {
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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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replace(parts) {
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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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get parts() {
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const parts = [];
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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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get length() {
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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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get start() {
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return this._start;
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}
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get end() {
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return this._end;
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}
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}
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