Wednesday, 11 April 2007

Article: Learn to Manipulate String Literals wit Interpreter Classes

Alejandro Gervasio, gives you more information with the second installment of the Interpreter Class with PHP 5. The basic idea of this series is to introduce the core concepts on this interpreter pattern, and also to complement its theory with educational hands-on examples.

In the first article of the series he illustrated how to use an interpreter class to handle a group of fictional users.

In this tutorial he teaches you how to utilize this pattern for manipulating a set of string processing classes. He gets started with the following sections:

• Handling literals: he demonstrates how to implement the interpreter pattern by developing a simple mechanism, which will come in handy for processing basic string literals.
• Defining a string interpreter class: in this section, he shows a new interpreter class.
• Parsing string commands by using the StringInterpreter class: he codes a script, which demonstrates how different string commands are parsed by the corresponding interpreter, resulting in the manipulation of a specific input string.