119 lines
3.2 KiB
JavaScript
119 lines
3.2 KiB
JavaScript
/*
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* Copyright (C) 2020-2022 Yomichan Authors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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class TextSourceMap {
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constructor(source, mapping=null) {
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this._source = source;
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this._mapping = (mapping !== null ? TextSourceMap.normalizeMapping(mapping) : null);
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}
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get source() {
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return this._source;
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}
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equals(other) {
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if (this === other) {
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return true;
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}
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const source = this._source;
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if (!(other instanceof TextSourceMap && source === other.source)) {
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return false;
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}
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let mapping = this._mapping;
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let otherMapping = other.getMappingCopy();
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if (mapping === null) {
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if (otherMapping === null) {
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return true;
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}
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mapping = TextSourceMap.createMapping(source);
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} else if (otherMapping === null) {
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otherMapping = TextSourceMap.createMapping(source);
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}
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const mappingLength = mapping.length;
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if (mappingLength !== otherMapping.length) {
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return false;
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}
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for (let i = 0; i < mappingLength; ++i) {
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if (mapping[i] !== otherMapping[i]) {
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return false;
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}
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}
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return true;
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}
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getSourceLength(finalLength) {
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const mapping = this._mapping;
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if (mapping === null) {
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return finalLength;
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}
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let sourceLength = 0;
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for (let i = 0; i < finalLength; ++i) {
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sourceLength += mapping[i];
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}
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return sourceLength;
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}
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combine(index, count) {
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if (count <= 0) { return; }
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if (this._mapping === null) {
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this._mapping = TextSourceMap.createMapping(this._source);
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}
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let sum = this._mapping[index];
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const parts = this._mapping.splice(index + 1, count);
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for (const part of parts) {
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sum += part;
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}
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this._mapping[index] = sum;
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}
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insert(index, ...items) {
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if (this._mapping === null) {
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this._mapping = TextSourceMap.createMapping(this._source);
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}
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this._mapping.splice(index, 0, ...items);
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}
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getMappingCopy() {
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return this._mapping !== null ? [...this._mapping] : null;
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}
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static createMapping(text) {
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return new Array(text.length).fill(1);
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}
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static normalizeMapping(mapping) {
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const result = [];
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for (const value of mapping) {
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result.push(
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(typeof value === 'number' && Number.isFinite(value)) ?
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Math.floor(value) :
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0
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);
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}
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return result;
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}
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}
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