Page 168 - DCAP512_WAP_AND_WML

WAP & WML

Notes  WML Script follows syntax rules which are script is case sensitive, white space is ignored,
blocks are enclosed in brackets “{}”, semicolons mark the ends of statements, comments
are marked with “//”.
 An “executable” file in WML Script is called a function. A WMLScript function is a named
part of the WMLScript compilation unit that you can call to perform a specific set of
statements and to return a value.
 You can use the function declaration to declare a WMLScript function name (Identifier)
with the optional parameters (FormalParameterList) and a block statement that is executed
when the function is called.

 In the syntax of function the optional extern keyword is used to specify that a function is to
be externally accessible. External functions can be called from outside the compilation
unit in which they are defined. Identifier is the name specified for the function. The optional
FormalParameterList is a list of argument names separated by commas.
 Block is the body of the function that is executed when the function is called and the
parameters have been initialized by the passed arguments.
 Variables for WML Script functions are weakly typed, must be declared, have a local
scope, must be one of these data types which are Boolean, Integer, Invalid, Float.

 The following words are reserved words and cannot be used for other naming purposes in
WML Script. They are Access, Agent, Break, Continue, Div, Domain, Else, Equiv, Extern,
Forfunction, Header, http, if, Isvalid, Meta, Name, Path, Return, Typeof, url, Use, User,
Var, While, String.
 The four categories of operators used in WML Script are assignment, arithmetic, comparison
and logical.
 WMLScript does not support arrays as such. However, the standard String library supports
functions by which array-like behavior can be implemented using strings.
 WMLScript supports the use of pragmas that specify compilation unit level information.
Pragmas are specified at the beginning of the compilation unit before any function
declaration. All pragmas start with the keyword use and are followed by pragma-specific
attributes.

 The standard libraries include script libraries, dialog libraries, float libraries, string
libraries, WML browser library, lang library, url library.

11.7 Keywords

ECMAScript: European Computer Manufacturers Association Script

Pragmas: WMLScript supports the use of pragmas that specify compilation unit level information.
Scripting: Scripting adds “behavioral” capabilities to the device to enhance application
performances and the user experience

WML Script: WML Script is a light JavaScript language.
WML: Wireless Markup Language
WMLScript Arrays: The standard String library supports functions by which array-like behavior
can be implemented using strings.
WMLScript Function: An “executable” file in WML Script is called a function

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