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The button click event calls the JSON.txt file: xmlhttp.open("GET", "JSON.txt", true); And the callback() function has been modified to include the JSON parsing. Of particular interest to us is the eval() statement: eval("var objResults =" + xmlhttp.responseText); This is where the JSON magic really happens. The JavaScript eval() statement is responsible for taking the incoming response text and rendering it as the object that it was destined to become. This magical rendering of the text is simply a JavaScript interpretation method for the text passed into it as a parameter. To understand this process, we must first understand that the JavaScript eval() statement will render the incoming text in its literal sense. For instance, in JavaScript, to declare an array with literal script, you would write var myStates = ["Michigan", "California", "New York"]; The preceding statement is declared in its literal sense with square brackets ([ ]) declaring that the enclosed text is an array and should be treated and used as such: alert(myStates[0]); alert(myStates[1]); alert(myStates[2]); // Would output "Michigan" // Would output "California" // Would output "New York"

:order=>'last_name ASC, first_name ASC' ) html = Erubis::Eruby.new(File.read('rewards_report_template.rhtml') ).evaluate({ :users=>users })

In the following example, the language contains two tokens. First is a DIGIT, which can be any one of the specified characters. The other token is a NUMBER, which is a sequence of DIGITs (one or more) followed by a '.' and a sequence of zero or more DIGITs. NUMBER := D+ ('.' D*) DIGIT := '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' Although this is a pretty simple example, you get the gist of it. You can look at the OCaml documentation for more complex examples. In fact, the lexical conventions are spelled out via a BNF-like notation.

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open('|"'+path_to_html2ps+'"', 'wb+') do |process_handle| process_handle.puts html process_handle.close_write ps_source = process_handle.read end pdf_source = '' open('|"' + path_to_ps2pdf +'" - -', 'wb+') do |process_handle| process_handle.puts ps_source process_handle.close_write pdf_source = process_handle.read end File.open('report.pdf','wb+') do |pdf_file_handle| pdf_file_handle.puts pdf_source end

The same process of interpretation holds true for JavaScript objects. They too can be declared, on the fly, with literal coding: var myCustomer = { "Name" : "John Doe", "State" : "Michigan" }; This particular object has been declared with two Name/Value properties that we can access in much the same way as typical OOP syntax: alert(myCustomer.Name); // Would output "John Doe" alert(myCustomer.State); // Would output "Michigan" As you can see, the primary difference between the array literal and the object literal is the use of curly braces versus the square brackets. The object also is composed of Name/Value pairs of whatever data type you desire. So now when our code assigns text to the objResults variable and sends it to the eval() statement, we re essentially saying to JavaScript, Take this text and treat it as a literal declarative statement. If the output of that process happens to be an object, then the eval() statement will have helped the JSON text make the transition from a textual representation of an object to the real-world JavaScript object type.

This question does not have a simple answer. On one hand, it is important to understand BNF notation so that you can understand it when you come across it (which you will). I cannot, however, point to a specific positive outcome that will occur if you understand BNF notation. If you want to use and create grammars and structured data files, understanding BNF will enable you to communicate and understand definitions. Understanding BNF will also enable you to understand programming languages better (including OCaml). Almost all programming languages have BNF structures available for them.

Save this file as calculate_rewards.rb. Next, create the HTML template, as shown in Listing 8-3.

It is generally accepted that the Internet was officially born in 1991 when CERN released World Wide Web software. Commercial restrictions on the Internet were then lifted, paving the way for corporate portal opportunities. By 1992, the web would grow to well over one million hosts.

This chapter gave you an introduction to the ocamllex and ocamlyacc tools, and the best way to gain depth in your understanding is to use them. These tools are very powerful and they help you with many different kinds of problems. They are, however, also difficult and they require a lot of time and effort to properly master them. In the next chapter, you will be presented with an implementation of a tool using ocamllex and ocamlyacc. The tool described is a log file parser and analysis tool that displays the power and flexibility of these two tools.

Listing 8-3. HTML Template for the Salesperson Reward Report (rewards_report_ template.rhtml)

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