stikjs/stik-core

(function( stik ){
  stik.injector = function injector( spec ){
    if ( !spec.executionUnit ) { throw "Stik: Injector needs a function to use as its execution unit"; }

    spec.resolveDependencies = function resolveDependencies(){
      var args = extractArguments();

      return grabModules( args );
    };

    function extractArguments(){
      var argsPattern, funcString, args;

      argsPattern = /^function\s*[^\(]*\(\s*([^\)]*)\)/m;

      funcString = spec.executionUnit.toString();

      args = funcString.match( argsPattern )[ 1 ].split( ',' );

      return trimmedArgs( args );
    }

    function trimmedArgs( args ){
      var result = [];
      args.forEach( function( arg ){
        result.push( arg.trim() );
      });
      return result;
    }

    function grabModules( args ){
      var module, dependencies;

      dependencies = [];

      if ( args.length === 1 && args[ 0 ] === "" ) { return []; }

      for ( var i = 0; i < args.length; i++ ) {
        if ( !( module = spec.modules[ args[ i ] ] ) ) {
          throw "Stik: could not find this module (" + args[ i ] + ")";
        }

        dependencies.push(
          module.resolve( spec.modules )
        );
      }

      return dependencies;
    }

    return spec;
  };
})( window.stik );