browserify-testability/dist/transform.js

Testing utility for replacing dependencies with mock versions at test-time, without modifying the original source.

var through;

through = require('through');

module.exports = function() {
  var footer, header, headerWritten, inject, injected, regexps, write;
  headerWritten = false;
  injected = {};
  regexps = [/@testability\s*require\s*([\w\/\.\-\~\@]+)/g, /testability\.require\s*\(['"]([\w\/\.\-\~\@]+)['"]/g];
  header = function() {
    headerWritten = true;
    return "\n\n/* Testability Injected Dependencies */\n";
  };
  footer = function() {
    if (headerWritten) {
      return "/* End Injected Dependencies */\n";
    } else {
      return '';
    }
  };
  inject = function(m) {
    if (injected[m]) {
      return '';
    } else {
      return injected[m] = "require('" + m + "');\n";
    }
  };
  write = function(buf) {
    var ms, r, src, _i, _len;
    src = buf.toString();
    for (_i = 0, _len = regexps.length; _i < _len; _i++) {
      r = regexps[_i];
      while (ms = r.exec(src)) {
        if (!headerWritten) {
          buf += header();
        }
        buf += inject(ms[1]);
      }
    }
    buf += footer();
    return this.emit('data', buf);
  };
  return through(write);
};