aaac7fed
 liuqimichale
add
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/*
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")
return this._cachedSize = this._cachedSource.length;
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;
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