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This chapter covered a lot of ground. It introduced network communication and showed a select-based socket server. This chapter is also one of the more practical examples of modules and code reuse you have been given. The fact that the scoring function could be integrated so easily is a testament to the power and flexibility of the OCaml module section. 16 covers ocamllex and ocamlyacc. These tools give access to regular expressions and a powerful typesafe parsing environment. They can be used to tackle problems as diverse as log file parsing to language construction. In fact, OCaml (and all meta-language [ML] family languages) have a lot of features that make writing compilers easier.

Firefox) and IE are ready and able to handle asynchronous Ajax action. The bad news is that the ActiveX object is instantiated differently for different target browsers. Let s take a look at implementing the XmlHttpRequest on a web page and the function necessary to make the asynchronous process available for further work. In Internet Explorer, the object is created with JavaScript on the HTML page as var req = new ActiveXObject("Microsoft.XMLHTTP") For the Mozilla and Safari browsers, a slightly different approach is required, in that the XmlHttpRequest is a built-in native object for those applications. Creating the object for use on this browser type uses the following call: var req = new XmlHttpRequest(); Obviously, with Mozilla market share rising and continued use of Apple s Safari, you ll need to support these browsers for web-facing projects. A typical JavaScript function for creating a multibrowser XmlHttpRequest variable would look something like the following: <script type="text/javascript" language="javascript"> var xmlhttp = false; function getHTTPRequestObject() { try { // try legacy object first xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) { try { // try IE implementation now xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } catch(E) { xmlhttp = false; } } if(!xmlhttp && typeof XmlHttpRequest!= 'undefined') { // we must be using a Mozilla-based browser // so create a native request object now xmlhttp = new XmlHttpRequest(); } } </script>

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The call to count_by_sql checks if a given transaction_id has already been entered; if it has, then the transaction won t be reentered. (Of course, in theory, the same file won t be entered twice, but if the user does enter the same file twice, you won t get any duplicate results.) The PaypalTransaction.new method creates a new transaction, and then the code loops through each column, and uses the send method to set each column to its appropriate value. send is a Ruby method that allows you to dynamically call methods on a given object. It takes a string with the method name and some arguments, and calls that method with the specified arguments. In other words, the following two lines are identical:

ou might have heard of Lex and Yacc. Lex, the Lexical Analyzer Generator, is a tool that helps you build programs that are built around regular expressions. Yacc, Yet Another Compiler Compiler, is a program for building interpreters and compilers from grammars that you define. Although you do not have to use these tools together (people often use just Lex or Yacc with a custom lexer), but they are often used together. This chapter presents ocamllex and ocamlyacc. You will see examples of how to build applications with both, including a word counting utility, a Reverse Polish Notation (RPN) calculator, and a configuration file language. Ocamllex and ocamlyacc both have syntax that is very similar to Lex and Yacc. These two tools have a long history in the Unix world, and there are several books and web sites dedicated to their use. The good news for OCaml users is that many of the examples and discussion are applicable to ocamllex and ocamlyacc.

some_object.some_method(some_value) some.object.send('some_method', some_value)

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