/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const Source = require("./Source");
const streamChunksOfSourceMap = require("./helpers/streamChunksOfSourceMap");
const streamChunksOfRawSource = require("./helpers/streamChunksOfRawSource");
const streamAndGetSourceAndMap = require("./helpers/streamAndGetSourceAndMap");
const mapToBufferedMap = map => {
if (typeof map !== "object" || !map) return map;
const bufferedMap = Object.assign({}, map);
if (map.mappings) {
bufferedMap.mappings = Buffer.from(map.mappings, "utf-8");
}
if (map.sourcesContent) {
bufferedMap.sourcesContent = map.sourcesContent.map(
str => str && Buffer.from(str, "utf-8")
);
}
return bufferedMap;
};
const bufferedMapToMap = bufferedMap => {
if (typeof bufferedMap !== "object" || !bufferedMap) return bufferedMap;
const map = Object.assign({}, bufferedMap);
if (bufferedMap.mappings) {
map.mappings = bufferedMap.mappings.toString("utf-8");
}
if (bufferedMap.sourcesContent) {
map.sourcesContent = bufferedMap.sourcesContent.map(
buffer => buffer && buffer.toString("utf-8")
);
}
return map;
};
class CachedSource extends Source {
constructor(source, cachedData) {
super();
this._source = source;
this._cachedSourceType = cachedData ? cachedData.source : undefined;
this._cachedSource = undefined;
this._cachedBuffer = cachedData ? cachedData.buffer : undefined;
this._cachedSize = cachedData ? cachedData.size : undefined;
this._cachedMaps = cachedData ? cachedData.maps : new Map();
this._cachedHashUpdate = cachedData ? cachedData.hash : undefined;
}
getCachedData() {
const bufferedMaps = new Map();
for (const pair of this._cachedMaps) {
let cacheEntry = pair[1];
if (cacheEntry.bufferedMap === undefined) {
cacheEntry.bufferedMap = mapToBufferedMap(
this._getMapFromCacheEntry(cacheEntry)
);
}
bufferedMaps.set(pair[0], {
map: undefined,
bufferedMap: cacheEntry.bufferedMap
});
}
// We don't want to cache strings
// So if we have a caches sources
// create a buffer from it and only store
// if it was a Buffer or string
if (this._cachedSource) {
this.buffer();
}
return {
buffer: this._cachedBuffer,
source:
this._cachedSourceType !== undefined
? this._cachedSourceType
: typeof this._cachedSource === "string"
? true
: Buffer.isBuffer(this._cachedSource)
? false
: undefined,
size: this._cachedSize,
maps: bufferedMaps,
hash: this._cachedHashUpdate
};
}
originalLazy() {
return this._source;
}
original() {
if (typeof this._source === "function") this._source = this._source();
return this._source;
}
source() {
const source = this._getCachedSource();
if (source !== undefined) return source;
return (this._cachedSource = this.original().source());
}
_getMapFromCacheEntry(cacheEntry) {
if (cacheEntry.map !== undefined) {
return cacheEntry.map;
} else if (cacheEntry.bufferedMap !== undefined) {
return (cacheEntry.map = bufferedMapToMap(cacheEntry.bufferedMap));
}
}
_getCachedSource() {
if (this._cachedSource !== undefined) return this._cachedSource;
if (this._cachedBuffer && this._cachedSourceType !== undefined) {
return (this._cachedSource = this._cachedSourceType
? this._cachedBuffer.toString("utf-8")
: this._cachedBuffer);
}
}
buffer() {
if (this._cachedBuffer !== undefined) return this._cachedBuffer;
if (this._cachedSource !== undefined) {
if (Buffer.isBuffer(this._cachedSource)) {
return (this._cachedBuffer = this._cachedSource);
}
return (this._cachedBuffer = Buffer.from(this._cachedSource, "utf-8"));
}
if (typeof this.original().buffer === "function") {
return (this._cachedBuffer = this.original().buffer());
}
const bufferOrString = this.source();
if (Buffer.isBuffer(bufferOrString)) {
return (this._cachedBuffer = bufferOrString);
}
return (this._cachedBuffer = Buffer.from(bufferOrString, "utf-8"));
}
size() {
if (this._cachedSize !== undefined) return this._cachedSize;
if (this._cachedBuffer !== undefined) {
return (this._cachedSize = this._cachedBuffer.length);
}
const source = this._getCachedSource();
if (source !== undefined) {
return (this._cachedSize = Buffer.byteLength(source));
}
return (this._cachedSize = this.original().size());
}
sourceAndMap(options) {
const key = options ? JSON.stringify(options) : "{}";
const cacheEntry = this._cachedMaps.get(key);
// Look for a cached map
if (cacheEntry !== undefined) {
// We have a cached map in some representation
const map = this._getMapFromCacheEntry(cacheEntry);
// Either get the cached source or compute it
return { source: this.source(), map };
}
// Look for a cached source
let source = this._getCachedSource();
// Compute the map
let map;
if (source !== undefined) {
map = this.original().map(options);
} else {
// Compute the source and map together.
const sourceAndMap = this.original().sourceAndMap(options);
source = sourceAndMap.source;
map = sourceAndMap.map;
this._cachedSource = source;
}
this._cachedMaps.set(key, {
map,
bufferedMap: undefined
});
return { source, map };
}
streamChunks(options, onChunk, onSource, onName) {
const key = options ? JSON.stringify(options) : "{}";
if (
this._cachedMaps.has(key) &&
(this._cachedBuffer !== undefined || this._cachedSource !== undefined)
) {
const { source, map } = this.sourceAndMap(options);
if (map) {
return streamChunksOfSourceMap(
source,
map,
onChunk,
onSource,
onName,
!!(options && options.finalSource),
true
);
} else {
return streamChunksOfRawSource(
source,
onChunk,
onSource,
onName,
!!(options && options.finalSource)
);
}
}
const { result, source, map } = streamAndGetSourceAndMap(
this.original(),
options,
onChunk,
onSource,
onName
);
this._cachedSource = source;
this._cachedMaps.set(key, {
map,
bufferedMap: undefined
});
return result;
}
map(options) {
const key = options ? JSON.stringify(options) : "{}";
const cacheEntry = this._cachedMaps.get(key);
if (cacheEntry !== undefined) {
return this._getMapFromCacheEntry(cacheEntry);
}
const map = this.original().map(options);
this._cachedMaps.set(key, {
map,
bufferedMap: undefined
});
return map;
}
updateHash(hash) {
if (this._cachedHashUpdate !== undefined) {
for (const item of this._cachedHashUpdate) hash.update(item);
return;
}
const update = [];
let currentString = undefined;
const tracker = {
update: item => {
if (typeof item === "string" && item.length < 10240) {
if (currentString === undefined) {
currentString = item;
} else {
currentString += item;
if (currentString.length > 102400) {
update.push(Buffer.from(currentString));
currentString = undefined;
}
}
} else {
if (currentString !== undefined) {
update.push(Buffer.from(currentString));
currentString = undefined;
}
update.push(item);
}
}
};
this.original().updateHash(tracker);
if (currentString !== undefined) {
update.push(Buffer.from(currentString));
}
for (const item of update) hash.update(item);
this._cachedHashUpdate = update;
}
}
module.exports = CachedSource;