code: function reduceFunctionCall(string, functionRE, callback) {
    var call = string
    return getFunctionCalls(string, functionRE).reduce(function(string, obj) {
      return string.replace(obj.functionIdentifier + "(" + obj.matches.body + ")", evalFunctionCall(obj.matches.body, obj.functionIdentifier, callback, call, functionRE))
    }, string)
  }
docs: Walkthrough all expressions, evaluate them and insert them into the declaration
  
  @param {Array} expressions
  @param {Object} declaration