Basic syntax

TrafficScript is a simple, command-based language. A command is called a 'statement', and each statement is terminated with a ';'. Comments begin with a '#' symbol, and finish at the end of the line:

   # Store the value '2' in the variable named $a
   $a = 2;

   # call the 'connection.close' function
   connection.close();

Variables are indicated by the '$' symbol. There is no typing in TrafficScript, and you do not need to pre-declare a variable before you use it. Variables are not persistent - they go out of scope when a rule completes.

You can use variables in expressions to calculate new values (numbers and strings). Common mathematical, comparison and boolean operators are available, and '.' is used to concatenate strings.

   # Set the value of $a to 1.75
   $a = 1 + 1/2 + 0.25;

   # create a new string with the '.' operator
   $fullname = $firstname . " " . $lastname;

Functions are called using the normal bracket-and-argument-list syntax, and many functions can take different numbers of arguments. Function names often contain two or three parts, separated by '.'; this conveniently groups functions into different families.

   $path = http.getPath();
   $cookie = http.getCookie( "ASPSESSIONID" );
   $browser = http.getHeader( "User-Agent" );

For more details please refer to the ZXTM TrafficScript documentation.

Owen Garrett [Zeus Dev Team] 01 July 2005