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'use strict'
const debug = require('debug')('purs-loader')
const loaderUtils = require('loader-utils')
const Promise = require('bluebird')
const fs = Promise.promisifyAll(require('fs'))
const path = require('path')
const jsStringEscape = require('js-string-escape')
const PsModuleMap = require('./PsModuleMap');
const Psc = require('./Psc');
const PscIde = require('./PscIde');
const dargs = require('./dargs');
const requireRegex = /require\(['"]\.\.\/([\w\.]+)['"]\)/g
module.exports = function purescriptLoader(source, map) {
const callback = this.async()
const config = this.options
const query = loaderUtils.parseQuery(this.query)
const webpackOptions = this.options.purescriptLoader || {}
const options = Object.assign({
context: config.context,
psc: 'psc',
pscArgs: {},
pscBundle: 'psc-bundle',
pscBundleArgs: {},
pscIde: false,
pscIdeColors: webpackOptions.psc === 'psa' || query.psc === 'psa',
pscIdeArgs: {},
bundleOutput: 'output/bundle.js',
bundleNamespace: 'PS',
bundle: false,
warnings: true,
output: 'output',
src: [
path.join('src', '**', '*.purs'),
path.join('bower_components', 'purescript-*', 'src', '**', '*.purs')
]
}, webpackOptions, query)
this.cacheable && this.cacheable()
let cache = config.purescriptLoaderCache = config.purescriptLoaderCache || {
rebuild: false,
deferred: [],
bundleModules: [],
warnings: [],
errors: []
}
if (!config.purescriptLoaderInstalled) {
config.purescriptLoaderInstalled = true
// invalidate loader cache when bundle is marked as invalid (in watch mode)
this._compiler.plugin('invalid', () => {
debug('invalidating loader cache');
cache = config.purescriptLoaderCache = {
rebuild: options.pscIde,
deferred: [],
bundleModules: [],
ideServer: cache.ideServer,
psModuleMap: cache.psModuleMap,
warnings: [],
errors: []
}
});
// add psc warnings to webpack compilation warnings
this._compiler.plugin('after-compile', (compilation, callback) => {
cache.warnings.forEach(warning => {
compilation.warnings.push(warning);
});
cache.errors.forEach(error => {
compilation.errors.push(error);
});
callback()
});
}
const psModuleName = PsModuleMap.match(source)
const psModule = {
name: psModuleName,
load: js => callback(null, js),
reject: error => callback(error),
srcPath: this.resourcePath,
srcDir: path.dirname(this.resourcePath),
jsPath: path.resolve(path.join(options.output, psModuleName, 'index.js')),
options: options,
cache: cache,
emitWarning: warning => {
if (options.warnings && warning.length) {
cache.warnings.push(warning);
}
},
emitError: error => {
if (error.length) {
cache.errors.push(error);
}
}
}
debug('loader called', psModule.name)
if (options.bundle) {
cache.bundleModules.push(psModule.name)
}
if (cache.rebuild) {
return PscIde.connect(psModule)
.then(PscIde.rebuild)
.then(toJavaScript)
.then(psModule.load)
.catch(psModule.reject)
}
if (cache.compilationFinished) {
return toJavaScript(psModule).then(psModule.load).catch(psModule.reject)
}
// We need to wait for compilation to finish before the loaders run so that
// references to compiled output are valid.
cache.deferred.push(psModule)
if (!cache.compilationStarted) {
return Psc.compile(psModule)
.then(() => PsModuleMap.makeMap(options.src).then(map => {
debug('rebuilt module map');
cache.psModuleMap = map;
}))
.then(() => Promise.map(cache.deferred, psModule => {
if (typeof cache.ideServer === 'object') cache.ideServer.kill()
return toJavaScript(psModule).then(psModule.load)
}))
.catch(error => {
cache.deferred[0].reject(error)
cache.deferred.slice(1).forEach(psModule => psModule.reject(new Error('purs-loader failed')))
})
}
}
function updatePsModuleMap(psModule) {
const options = psModule.options
const cache = psModule.cache
const filePurs = psModule.srcPath
if (!cache.psModuleMap) {
debug('module mapping does not exist');
return PsModuleMap.makeMap(options.src).then(map => {
cache.psModuleMap = map;
return cache.psModuleMap;
});
}
else {
return PsModuleMap.makeMapEntry(filePurs).then(result => {
const map = Object.assign(cache.psModuleMap, result)
cache.psModuleMap = map;
return cache.psModuleMap;
});
}
}
// The actual loader is executed *after* purescript compilation.
function toJavaScript(psModule) {
const options = psModule.options
const cache = psModule.cache
const bundlePath = path.resolve(options.bundleOutput)
const jsPath = cache.bundle ? bundlePath : psModule.jsPath
debug('loading JavaScript for', psModule.name)
return Promise.props({
js: fs.readFileAsync(jsPath, 'utf8'),
psModuleMap: updatePsModuleMap(psModule)
}).then(result => {
let js = ''
if (options.bundle) {
// if bundling, return a reference to the bundle
js = 'module.exports = require("'
+ jsStringEscape(path.relative(psModule.srcDir, options.bundleOutput))
+ '")["' + psModule.name + '"]'
} else {
// replace require paths to output files generated by psc with paths
// to purescript sources, which are then also run through this loader.
js = result.js
.replace(requireRegex, (m, p1) => {
return 'require("' + jsStringEscape(result.psModuleMap[p1].src) + '")'
})
.replace(/require\(['"]\.\/foreign['"]\)/g, (m, p1) => {
return 'require("' + jsStringEscape(result.psModuleMap[psModule.name].ffi) + '")'
})
}
return js
})
}
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