src/purs-module-map.js

   1 'use strict';
   2
   3 const path = require('path');
   4
   5 const Promise = require('bluebird');
   6
   7 const fs = Promise.promisifyAll(require('fs'));
   8
   9 const globby = require('globby');
  10
  11 const debug = require('debug')('purs-loader');
  12
  13 const srcModuleRegex = /(?:^|\n)module\s+([\w\.]+)/i;
  14
  15 const importModuleRegex = /(?:^|\n)\s*import\s+([\w\.]+)/ig;
  16
  17 module.exports.matchModule = function matchModule(str) {
  18   const matches = str.match(srcModuleRegex);
  19   return matches && matches[1];
  20 };
  21
  22 module.exports.matchImports = function matchImports(str) {
  23   const matches = str.match(importModuleRegex);
  24   return (matches || []).map(a => a.replace(/\n?\s*import\s+/i, ''));
  25 };
  26
  27 module.exports.makeMapEntry = function makeMapEntry(filePurs) {
  28   const dirname = path.dirname(filePurs);
  29
  30   const basename = path.basename(filePurs, '.purs');
  31
  32   const fileJs = path.join(dirname, `${basename}.js`);
  33
  34   const result = Promise.props({
  35     filePurs: fs.readFileAsync(filePurs, 'utf8'),
  36     fileJs: fs.readFileAsync(fileJs, 'utf8').catch(() => undefined)
  37   }).then(fileMap => {
  38     const sourcePurs = fileMap.filePurs;
  39
  40     const sourceJs = fileMap.fileJs;
  41
  42     const moduleName = module.exports.matchModule(sourcePurs);
  43
  44     const imports = module.exports.matchImports(sourcePurs);
  45
  46     const map = {};
  47
  48     map[moduleName] = map[moduleName] || {};
  49
  50     map[moduleName].src = path.resolve(filePurs);
  51
  52     map[moduleName].imports = imports;
  53
  54     if (sourceJs) {
  55       map[moduleName].ffi = path.resolve(fileJs);
  56     }
  57
  58     return map;
  59   });
  60
  61   return result;
  62 };
  63
  64 module.exports.makeMap = function makeMap(src) {
  65   debug('loading PureScript source and FFI files from %o', src);
  66
  67   const globs = [].concat(src);
  68
  69   return globby(globs).then(paths =>
  70     Promise.all(paths.map(module.exports.makeMapEntry)).then(result =>
  71       result.reduce(Object.assign, {})
  72     )
  73   );
  74 };