1 | "use strict";
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2 |
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3 | var crypto = require("crypto");
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4 | var mkdirp = require("mkdirp");
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5 | var findCacheDir = require("find-cache-dir");
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6 | var fs = require("fs");
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7 | var os = require("os");
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8 | var path = require("path");
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9 | var zlib = require("zlib");
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10 |
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11 | var read = function read(filename, callback) {
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12 | return fs.readFile(filename, function (err, data) {
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13 | if (err) {
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14 | return callback(err);
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15 | }
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16 |
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17 | return zlib.gunzip(data, function (err, content) {
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18 | var result = {};
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19 |
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20 | if (err) {
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21 | return callback(err);
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22 | }
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23 |
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24 | try {
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25 | result = JSON.parse(content);
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26 | } catch (e) {
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27 | return callback(e);
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28 | }
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29 |
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30 | return callback(null, result);
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31 | });
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32 | });
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33 | };
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34 |
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35 | var write = function write(filename, result, callback) {
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36 | var content = JSON.stringify(result);
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37 |
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38 | return zlib.gzip(content, function (err, data) {
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39 | if (err) {
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40 | return callback(err);
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41 | }
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42 |
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43 | return fs.writeFile(filename, data, callback);
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44 | });
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45 | };
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46 |
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47 | var filename = function filename(source, identifier, options) {
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48 | var hash = crypto.createHash("SHA1");
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49 | var contents = JSON.stringify({
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50 | source: source,
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51 | options: options,
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52 | identifier: identifier
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53 | });
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54 |
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55 | hash.end(contents);
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56 |
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57 | return hash.read().toString("hex") + ".json.gz";
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58 | };
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59 |
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60 | var handleCache = function handleCache(directory, params, callback) {
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61 | var source = params.source;
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62 | var options = params.options || {};
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63 | var transform = params.transform;
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64 | var identifier = params.identifier;
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65 | var shouldFallback = typeof params.directory !== "string" && directory !== os.tmpdir();
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66 |
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67 | mkdirp(directory, function (err) {
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68 | if (err) return shouldFallback ? handleCache(os.tmpdir(), params, callback) : callback(err);
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69 |
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70 | var file = path.join(directory, filename(source, identifier, options));
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71 |
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72 | return read(file, function (err, content) {
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73 | var result = {};
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74 |
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75 | if (!err) return callback(null, content);
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76 |
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77 | try {
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78 | result = transform(source, options);
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79 | } catch (error) {
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80 | return callback(error);
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81 | }
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82 |
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83 | return write(file, result, function (err) {
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84 | if (err) return shouldFallback ? handleCache(os.tmpdir(), params, callback) : callback(err);
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85 |
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86 | callback(null, result);
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87 | });
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88 | });
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89 | });
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90 | };
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91 |
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92 | module.exports = function (params, callback) {
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93 | var directory = void 0;
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94 |
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95 | if (typeof params.directory === "string") {
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96 | directory = params.directory;
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97 | } else {
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98 | directory = findCacheDir({ name: "babel-loader" }) || os.tmpdir();
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99 | }
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100 |
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101 | handleCache(directory, params, callback);
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102 | }; |
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