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7de41f10 AM |
1 | 'use strict' |
2 | ||
7de41f10 AM |
3 | const debug = require('debug')('purs-loader') |
4 | const loaderUtils = require('loader-utils') | |
7de41f10 AM |
5 | const Promise = require('bluebird') |
6 | const fs = Promise.promisifyAll(require('fs')) | |
7de41f10 | 7 | const path = require('path') |
f8d292fb | 8 | const jsStringEscape = require('js-string-escape') |
531c751f | 9 | const PsModuleMap = require('./PsModuleMap'); |
10 | const Psc = require('./Psc'); | |
11 | const PscIde = require('./PscIde'); | |
12 | const dargs = require('./dargs'); | |
7de41f10 | 13 | |
7de41f10 AM |
14 | const requireRegex = /require\(['"]\.\.\/([\w\.]+)['"]\)/g |
15 | ||
16 | module.exports = function purescriptLoader(source, map) { | |
17 | const callback = this.async() | |
18 | const config = this.options | |
19 | const query = loaderUtils.parseQuery(this.query) | |
20 | const webpackOptions = this.options.purescriptLoader || {} | |
21 | ||
22 | const options = Object.assign({ | |
23 | context: config.context, | |
24 | psc: 'psc', | |
25 | pscArgs: {}, | |
26 | pscBundle: 'psc-bundle', | |
27 | pscBundleArgs: {}, | |
5163b5a2 | 28 | pscIde: false, |
7de41f10 AM |
29 | pscIdeColors: webpackOptions.psc === 'psa' || query.psc === 'psa', |
30 | pscIdeArgs: {}, | |
31 | bundleOutput: 'output/bundle.js', | |
32 | bundleNamespace: 'PS', | |
33 | bundle: false, | |
34 | warnings: true, | |
35 | output: 'output', | |
36 | src: [ | |
37 | path.join('src', '**', '*.purs'), | |
38 | path.join('bower_components', 'purescript-*', 'src', '**', '*.purs') | |
2b2207bd | 39 | ] |
7de41f10 AM |
40 | }, webpackOptions, query) |
41 | ||
42 | this.cacheable && this.cacheable() | |
43 | ||
44 | let cache = config.purescriptLoaderCache = config.purescriptLoaderCache || { | |
45 | rebuild: false, | |
46 | deferred: [], | |
531c751f | 47 | bundleModules: [] |
7de41f10 AM |
48 | } |
49 | ||
50 | if (!config.purescriptLoaderInstalled) { | |
51 | config.purescriptLoaderInstalled = true | |
52 | ||
53 | // invalidate loader cache when bundle is marked as invalid (in watch mode) | |
54 | this._compiler.plugin('invalid', () => { | |
531c751f | 55 | debug('invalidating loader cache'); |
56 | ||
7de41f10 | 57 | cache = config.purescriptLoaderCache = { |
5163b5a2 | 58 | rebuild: options.pscIde, |
7de41f10 | 59 | deferred: [], |
531c751f | 60 | bundleModules: [], |
61 | ideServer: cache.ideServer, | |
62 | psModuleMap: cache.psModuleMap | |
7de41f10 AM |
63 | } |
64 | }) | |
65 | ||
66 | // add psc warnings to webpack compilation warnings | |
67 | this._compiler.plugin('after-compile', (compilation, callback) => { | |
9dc10210 AM |
68 | if (options.warnings && cache.warnings) { |
69 | compilation.warnings.unshift(`PureScript compilation:\n${cache.warnings}`) | |
0b853815 | 70 | cache.warnings = null; |
7de41f10 AM |
71 | } |
72 | ||
9dc10210 AM |
73 | if (cache.errors) { |
74 | compilation.errors.unshift(`PureScript compilation:\n${cache.errors}`) | |
0b853815 | 75 | cache.errors = null; |
7de41f10 AM |
76 | } |
77 | ||
78 | callback() | |
79 | }) | |
80 | } | |
81 | ||
531c751f | 82 | const psModuleName = PsModuleMap.match(source) |
7de41f10 AM |
83 | const psModule = { |
84 | name: psModuleName, | |
85 | load: js => callback(null, js), | |
86 | reject: error => callback(error), | |
87 | srcPath: this.resourcePath, | |
88 | srcDir: path.dirname(this.resourcePath), | |
89 | jsPath: path.resolve(path.join(options.output, psModuleName, 'index.js')), | |
90 | options: options, | |
91 | cache: cache, | |
92 | } | |
93 | ||
67888496 AM |
94 | debug('loader called', psModule.name) |
95 | ||
7de41f10 AM |
96 | if (options.bundle) { |
97 | cache.bundleModules.push(psModule.name) | |
98 | } | |
99 | ||
100 | if (cache.rebuild) { | |
531c751f | 101 | return PscIde.connect(psModule) |
102 | .then(PscIde.rebuild) | |
7de41f10 AM |
103 | .then(toJavaScript) |
104 | .then(psModule.load) | |
105 | .catch(psModule.reject) | |
106 | } | |
107 | ||
67888496 | 108 | if (cache.compilationFinished) { |
7de41f10 AM |
109 | return toJavaScript(psModule).then(psModule.load).catch(psModule.reject) |
110 | } | |
111 | ||
112 | // We need to wait for compilation to finish before the loaders run so that | |
113 | // references to compiled output are valid. | |
114 | cache.deferred.push(psModule) | |
115 | ||
67888496 | 116 | if (!cache.compilationStarted) { |
531c751f | 117 | return Psc.compile(psModule) |
118 | .then(() => PsModuleMap.makeMap(options.src).then(map => { | |
119 | debug('rebuilt module map'); | |
120 | cache.psModuleMap = map; | |
121 | })) | |
7de41f10 AM |
122 | .then(() => Promise.map(cache.deferred, psModule => { |
123 | if (typeof cache.ideServer === 'object') cache.ideServer.kill() | |
124 | return toJavaScript(psModule).then(psModule.load) | |
125 | })) | |
126 | .catch(error => { | |
127 | cache.deferred[0].reject(error) | |
4b99e432 | 128 | cache.deferred.slice(1).forEach(psModule => psModule.reject(new Error('purs-loader failed'))) |
7de41f10 AM |
129 | }) |
130 | } | |
131 | } | |
132 | ||
531c751f | 133 | function updatePsModuleMap(psModule) { |
134 | const options = psModule.options | |
135 | const cache = psModule.cache | |
136 | const filePurs = psModule.srcPath | |
137 | if (!cache.psModuleMap) { | |
138 | debug('module mapping does not exist'); | |
139 | return PsModuleMap.makeMap(options.src).then(map => { | |
140 | cache.psModuleMap = map; | |
141 | return cache.psModuleMap; | |
142 | }); | |
143 | } | |
144 | else { | |
145 | return PsModuleMap.makeMapEntry(filePurs).then(result => { | |
146 | const map = Object.assign(cache.psModuleMap, result) | |
147 | cache.psModuleMap = map; | |
148 | return cache.psModuleMap; | |
149 | }); | |
150 | } | |
151 | } | |
152 | ||
7de41f10 AM |
153 | // The actual loader is executed *after* purescript compilation. |
154 | function toJavaScript(psModule) { | |
155 | const options = psModule.options | |
156 | const cache = psModule.cache | |
157 | const bundlePath = path.resolve(options.bundleOutput) | |
158 | const jsPath = cache.bundle ? bundlePath : psModule.jsPath | |
159 | ||
67888496 | 160 | debug('loading JavaScript for', psModule.name) |
7de41f10 AM |
161 | |
162 | return Promise.props({ | |
163 | js: fs.readFileAsync(jsPath, 'utf8'), | |
531c751f | 164 | psModuleMap: updatePsModuleMap(psModule) |
7de41f10 AM |
165 | }).then(result => { |
166 | let js = '' | |
167 | ||
168 | if (options.bundle) { | |
169 | // if bundling, return a reference to the bundle | |
170 | js = 'module.exports = require("' | |
f8d292fb | 171 | + jsStringEscape(path.relative(psModule.srcDir, options.bundleOutput)) |
7de41f10 AM |
172 | + '")["' + psModule.name + '"]' |
173 | } else { | |
174 | // replace require paths to output files generated by psc with paths | |
175 | // to purescript sources, which are then also run through this loader. | |
7de41f10 AM |
176 | js = result.js |
177 | .replace(requireRegex, (m, p1) => { | |
f8d292fb | 178 | return 'require("' + jsStringEscape(result.psModuleMap[p1].src) + '")' |
17acb575 AM |
179 | }) |
180 | .replace(/require\(['"]\.\/foreign['"]\)/g, (m, p1) => { | |
f8d292fb | 181 | return 'require("' + jsStringEscape(result.psModuleMap[psModule.name].ffi) + '")' |
7de41f10 | 182 | }) |
7de41f10 AM |
183 | } |
184 | ||
185 | return js | |
186 | }) | |
187 | } |