source: trip-planner-front/node_modules/webpack-sources/lib/CachedSource.js

/*
        MIT License http://www.opensource.org/licenses/mit-license.php
        Author Tobias Koppers @sokra
*/
"use strict";

const Source = require("./Source");

class CachedSource extends Source {
        constructor(source) {
                super();
                this._source = source;
                this._cachedSource = undefined;
                this._cachedSize = undefined;
                this._cachedMaps = {};

                if(source.node) this.node = function(options) {
                        return this._source.node(options);
                };

                if(source.listMap) this.listMap = function(options) {
                        return this._source.listMap(options);
                };
        }

        source() {
                if(typeof this._cachedSource !== "undefined") return this._cachedSource;
                return this._cachedSource = this._source.source();
        }

        size() {
                if(typeof this._cachedSize !== "undefined") return this._cachedSize;
                if(typeof this._cachedSource !== "undefined") {
                        if(Buffer.from.length === 1) return new Buffer(this._cachedSource).length;
                        return this._cachedSize = Buffer.byteLength(this._cachedSource);
                }
                return this._cachedSize = this._source.size();
        }

        sourceAndMap(options) {
                const key = JSON.stringify(options);
                if(typeof this._cachedSource !== "undefined" && key in this._cachedMaps)
                        return {
                                source: this._cachedSource,
                                map: this._cachedMaps[key]
                        };
                else if(typeof this._cachedSource !== "undefined") {
                        return {
                                source: this._cachedSource,
                                map: this._cachedMaps[key] = this._source.map(options)
                        };
                } else if(key in this._cachedMaps) {
                        return {
                                source: this._cachedSource = this._source.source(),
                                map: this._cachedMaps[key]
                        };
                }
                const result = this._source.sourceAndMap(options);
                this._cachedSource = result.source;
                this._cachedMaps[key] = result.map;
                return {
                        source: this._cachedSource,
                        map: this._cachedMaps[key]
                };
        }

        map(options) {
                if(!options) options = {};
                const key = JSON.stringify(options);
                if(key in this._cachedMaps)
                        return this._cachedMaps[key];
                return this._cachedMaps[key] = this._source.map();
        }

        updateHash(hash) {
                this._source.updateHash(hash);
        }
}

module.exports = CachedSource;