106 lines
2.6 KiB
JavaScript
Vendored
106 lines
2.6 KiB
JavaScript
Vendored
"use strict";
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var crypto = require("crypto");
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var mkdirp = require("mkdirp");
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var findCacheDir = require("find-cache-dir");
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var fs = require("fs");
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var os = require("os");
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var path = require("path");
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var zlib = require("zlib");
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var defaultCacheDirectory = null;
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var read = function read(filename, callback) {
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return fs.readFile(filename, function (err, data) {
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if (err) {
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return callback(err);
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}
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return zlib.gunzip(data, function (err, content) {
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var result = {};
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if (err) {
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return callback(err);
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}
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try {
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result = JSON.parse(content);
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} catch (e) {
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return callback(e);
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}
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return callback(null, result);
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});
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});
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};
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var write = function write(filename, result, callback) {
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var content = JSON.stringify(result);
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return zlib.gzip(content, function (err, data) {
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if (err) {
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return callback(err);
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}
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return fs.writeFile(filename, data, callback);
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});
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};
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var filename = function filename(source, identifier, options) {
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var hash = crypto.createHash("SHA1");
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var contents = JSON.stringify({
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source: source,
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options: options,
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identifier: identifier
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});
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hash.end(contents);
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return hash.read().toString("hex") + ".json.gz";
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};
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var handleCache = function handleCache(directory, params, callback) {
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var source = params.source;
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var options = params.options || {};
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var transform = params.transform;
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var identifier = params.identifier;
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var shouldFallback = typeof params.directory !== "string" && directory !== os.tmpdir();
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mkdirp(directory, function (err) {
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if (err) return shouldFallback ? handleCache(os.tmpdir(), params, callback) : callback(err);
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var file = path.join(directory, filename(source, identifier, options));
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return read(file, function (err, content) {
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var result = {};
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if (!err) return callback(null, content);
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try {
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result = transform(source, options);
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} catch (error) {
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return callback(error);
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}
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return write(file, result, function (err) {
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if (err) return shouldFallback ? handleCache(os.tmpdir(), params, callback) : callback(err);
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callback(null, result);
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});
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});
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});
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};
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module.exports = function (params, callback) {
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var directory = void 0;
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if (typeof params.directory === "string") {
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directory = params.directory;
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} else {
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if (defaultCacheDirectory === null) {
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defaultCacheDirectory = findCacheDir({ name: "babel-loader" }) || os.tmpdir();
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}
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directory = defaultCacheDirectory;
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}
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handleCache(directory, params, callback);
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}; |