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'use strict';
var Promise = require('bluebird');
var fs = Promise.promisifyAll(require('fs'));
var path = require('path');
var jsStringEscape = require('js-string-escape');
var difference = require('lodash.difference');
var debug_ = require('debug');
var debug = debug_('purs-loader');
var debugVerbose = debug_('purs-loader:verbose');
var PsModuleMap = require('./purs-module-map');
function updatePsModuleMap(psModule) {
var options = psModule.options;
var cache = psModule.cache;
var filePurs = psModule.srcPath;
if (!cache.psModuleMap) {
debugVerbose('module mapping does not exist - making a new module map');
cache.psModuleMap = PsModuleMap.makeMap(options.src);
return cache.psModuleMap;
} else {
debugVerbose('module mapping exists - updating module map for %s', filePurs);
cache.psModuleMap = cache.psModuleMap.then(function (psModuleMap) {
return PsModuleMap.makeMapEntry(filePurs).then(function (result) {
var map = Object.assign(psModuleMap, result);
return map;
});
});
return cache.psModuleMap;
}
}
// Reference the bundle.
function makeBundleJS(psModule) {
var bundleOutput = psModule.options.bundleOutput;
var name = psModule.name;
var srcDir = psModule.srcDir;
var escaped = jsStringEscape(path.relative(srcDir, bundleOutput));
var result = 'module.exports = require("' + escaped + '")["' + name + '"]';
return Promise.resolve(result);
}
// Replace require paths to output files generated by psc with paths
// to purescript sources, which are then also run through this loader.
// Additionally, the imports replaced are tracked so that in the event
// the compiler fails to compile the PureScript source, we can tack on
// any new imports in order to allow webpack to watch the new files
// before they have been successfully compiled.
function makeJS(psModule, psModuleMap, js) {
var requireRE = /require\(['"]\.\.\/([\w\.]+)(?:\/index\.js)?['"]\)/g;
var foreignRE = /require\(['"]\.\/foreign(?:\.js)?['"]\)/g;
var name = psModule.name;
var imports = psModuleMap[name].imports;
var replacedImports = [];
var result = js.replace(requireRE, function (m, p1) {
var moduleValue = psModuleMap[p1];
if (!moduleValue) {
debug('module %s was not found in the map, replacing require with null', p1);
return 'null';
} else {
var escapedPath = jsStringEscape(moduleValue.src);
replacedImports.push(p1);
return 'require("' + escapedPath + '")';
}
}).replace(foreignRE, function () {
var escapedPath = jsStringEscape(psModuleMap[name].ffi);
return 'require("' + escapedPath + '")';
});
var additionalImports = difference(imports, replacedImports);
if (!additionalImports.length) {
return Promise.resolve(result);
} else {
debug('rebuilding module map due to additional imports for %s: %o', name, additionalImports);
psModule.cache.psModuleMap = null;
return updatePsModuleMap(psModule).then(function (updatedPsModuleMap) {
var additionalImportsResult = additionalImports.map(function (import_) {
var moduleValue = updatedPsModuleMap[import_];
if (!moduleValue) {
debug('module %s was not found in the map, skipping require', import_);
return null;
} else {
var escapedPath = jsStringEscape(moduleValue.src);
return 'var ' + import_.replace(/\./g, '_') + ' = require("' + escapedPath + '")';
}
}).filter(function (a) {
return a !== null;
}).join('\n');
return result + '\n' + additionalImportsResult;
});
}
}
module.exports = function toJavaScript(psModule) {
var options = psModule.options;
var cache = psModule.cache;
var bundlePath = path.resolve(options.bundleOutput);
var jsPath = options.bundle ? bundlePath : psModule.jsPath;
var js = fs.readFileAsync(jsPath, 'utf8').catch(function () {
return '';
});
var psModuleMap = updatePsModuleMap(psModule);
debugVerbose('loading JavaScript for %s', psModule.name);
return Promise.props({ js: js, psModuleMap: psModuleMap }).then(function (result) {
return options.bundle ? makeBundleJS(psModule) : makeJS(psModule, result.psModuleMap, result.js);
});
};
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