src/PsModuleMap.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 function matchModule(str) {
  18   const matches = str.match(srcModuleRegex);
  19   return matches && matches[1];
  20 }
  21 module.exports.match = matchModule;
  22
  23 function matchImports(str) {
  24   const matches = str.match(importModuleRegex);
  25   return (matches || []).map(a => a.replace(/\n?\s*import\s+/i, ''));
  26 }
  27 module.exports.matchImports = matchImports;
  28
  29 function makeMapEntry(filePurs) {
  30   const dirname = path.dirname(filePurs);
  31
  32   const basename = path.basename(filePurs, '.purs');
  33
  34   const fileJs = path.join(dirname, `${basename}.js`);
  35
  36   const result = Promise.props({
  37     filePurs: fs.readFileAsync(filePurs, 'utf8'),
  38     fileJs: fs.readFileAsync(fileJs, 'utf8').catch(() => undefined)
  39   }).then(fileMap => {
  40     const sourcePurs = fileMap.filePurs;
  41
  42     const sourceJs = fileMap.fileJs;
  43
  44     const moduleName = matchModule(sourcePurs);
  45
  46     const imports = matchImports(sourcePurs);
  47
  48     const map = {};
  49
  50     map[moduleName] = map[moduleName] || {};
  51
  52     map[moduleName].src = path.resolve(filePurs);
  53
  54     map[moduleName].imports = imports;
  55
  56     if (sourceJs) {
  57       map[moduleName].ffi = path.resolve(fileJs);
  58     }
  59
  60     return map;
  61   });
  62
  63   return result;
  64 }
  65 module.exports.makeMapEntry = makeMapEntry;
  66
  67 function makeMap(src) {
  68   debug('loading PureScript source and FFI files from %o', src);
  69
  70   const globs = [].concat(src);
  71
  72   return globby(globs).then(paths =>
  73     Promise.all(paths.map(makeMapEntry)).then(result =>
  74       result.reduce(Object.assign, {})
  75     )
  76   );
  77 }
  78 module.exports.makeMap = makeMap;