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80 lines
2.0 KiB
80 lines
2.0 KiB
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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const Source = require("./Source");
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class CachedSource extends Source {
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constructor(source) {
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super();
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this._source = source;
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this._cachedSource = undefined;
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this._cachedSize = undefined;
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this._cachedMaps = {};
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if(source.node) this.node = function(options) {
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return this._source.node(options);
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};
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if(source.listMap) this.listMap = function(options) {
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return this._source.listMap(options);
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};
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}
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source() {
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if(typeof this._cachedSource !== "undefined") return this._cachedSource;
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return this._cachedSource = this._source.source();
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}
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size() {
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if(typeof this._cachedSize !== "undefined") return this._cachedSize;
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if(typeof this._cachedSource !== "undefined") {
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if(Buffer.from.length === 1) return new Buffer(this._cachedSource).length;
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return this._cachedSize = Buffer.byteLength(this._cachedSource);
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}
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return this._cachedSize = this._source.size();
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}
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sourceAndMap(options) {
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const key = JSON.stringify(options);
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if(typeof this._cachedSource !== "undefined" && key in this._cachedMaps)
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return {
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source: this._cachedSource,
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map: this._cachedMaps[key]
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};
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else if(typeof this._cachedSource !== "undefined") {
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return {
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source: this._cachedSource,
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map: this._cachedMaps[key] = this._source.map(options)
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};
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} else if(key in this._cachedMaps) {
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return {
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source: this._cachedSource = this._source.source(),
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map: this._cachedMaps[key]
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};
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}
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const result = this._source.sourceAndMap(options);
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this._cachedSource = result.source;
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this._cachedMaps[key] = result.map;
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return {
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source: this._cachedSource,
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map: this._cachedMaps[key]
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};
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}
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map(options) {
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if(!options) options = {};
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const key = JSON.stringify(options);
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if(key in this._cachedMaps)
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return this._cachedMaps[key];
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return this._cachedMaps[key] = this._source.map();
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}
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updateHash(hash) {
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this._source.updateHash(hash);
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}
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}
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module.exports = CachedSource;
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