js/webpack_util/jsan-preprocess-loader.js

   1 // Handles JSAN imports and adds the JSAN adaptor as needed.
   2
   3 const path = require('path');
   4 const fs = require('fs');
   5 const loaderUtils = require('loader-utils');
   6 const {
   7         JSAN_adaptor,
   8         common_js_regex,
   9         import_regex,
  10         src_path_to_JSAN,
  11         isChildOf } = require("./utils.js");
  12
  13 module.exports = function() {
  14         this.cacheable();
  15         const callback = this.async();
  16         const options = loaderUtils.getOptions(this);
  17         var rpath = this.resourcePath;
  18         fs.readFile(rpath, function read(err, data) {
  19             if (err) {
  20                 callback(err);
  21             }
  22                 var JSAN_adapt = "require('"+JSAN_adaptor+"');\n";
  23                 var head = "";
  24                 var replac_func = function(match,group1,group2){
  25                         head = head || JSAN_adapt;
  26                         var relpath = group1||group2;
  27                         var src_path = path.resolve(path.dirname(rpath),relpath);
  28                         return isChildOf(src_path,options.legacyPath) ? src_path_to_JSAN(options.legacyPath,src_path) : match;
  29                 };
  30                 var out = String(data).replace(import_regex,replac_func)
  31                                                           .replace(common_js_regex,replac_func);
  32                 callback(null, head+out);
  33         });
  34 };