opencv/sources/modules/js/src/make_umd.py

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# AUTHOR: Sajjad Taheri, University of California, Irvine. sajjadt[at]uci[dot]edu
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import os, sys, re, json, shutil
from subprocess import Popen, PIPE, STDOUT

PY3 = sys.version_info >= (3, 0)

def make_umd(opencvjs, cvjs):
    with open(opencvjs, 'r+b') as src:
        content = src.read()
    if PY3:  # content is bytes
        content = content.decode('utf-8')
    with open(cvjs, 'w+b') as dst:
        # inspired by https://github.com/umdjs/umd/blob/95563fd6b46f06bda0af143ff67292e7f6ede6b7/templates/returnExportsGlobal.js
        dst.write(("""
(function (root, factory) {
  if (typeof define === 'function' && define.amd) {
    // AMD. Register as an anonymous module.
    define(function () {
      return (root.cv = factory());
    });
  } else if (typeof module === 'object' && module.exports) {
    // Node. Does not work with strict CommonJS, but
    // only CommonJS-like environments that support module.exports,
    // like Node.
    module.exports = factory();
  } else if (typeof window === 'object') {
    // Browser globals
    root.cv = factory();
  } else if (typeof importScripts === 'function') {
    // Web worker
    root.cv = factory();
  } else {
    // Other shells, e.g. d8
    root.cv = factory();
  }
}(this, function () {
  %s
  if (typeof Module === 'undefined')
    Module = {};
  return cv(Module);
}));
        """ % (content)).lstrip().encode('utf-8'))


if __name__ == "__main__":
    if len(sys.argv) > 2:
        opencvjs = sys.argv[1]
        cvjs = sys.argv[2]
        if not os.path.isfile(opencvjs):
            print('opencv.js file not found! Have you compiled the opencv_js module?')
            exit()
        make_umd(opencvjs, cvjs);