The SMC syntax provides a number of % directives. Each directive's use is described in this section.

% Directives

%start Specifies the state machine start state in the form <map>::<state>
Required: Yes.
Supported target languages: All.

%class Specifies the associated state machine context class providing the guard and action methods.
Required: Yes.
Supported target languages: All.

%fsmclass Specifies the generated state machine class name.
Required: No.
Default settings: <%class name>Context
Supported target languages: All.

%fsmfile Specifies the generated state machine class file name. This filename is appended with the appropriate suffix to generate the full file name. The file name suffix may be changed from its default, target language-specific value by using the -suffix and -hsuffix command line parameters.
Required: No.
See this table for the default FSM class name, FSM file name, and suffix for each supported target programming language.
Supported target languages: All.

%package Put the generated code into this package/namespace.
Required: No.
Default settings: None.
Supported target languages: All.

%include Used to a include header file needed by the generated state machine code.
Required: No.
Default settings: No includes.
Supported target languages: C, C++, Objective-C

%import Used to import/use a class needed by the generated state machine code.
Required: No.
Default settings: No imports.
Supported target languages: C#, C++, Groovy, JavaScript, Java, Lua, Perl, PHP, Python, Ruby, Scala, TCL, VB.NET

%declare C/C++/Objective-C forward declaration placed in the header file.
Required: No.
Default settings: No declarations.
Supported target languages: C, C++, Objective-C

%access Specifies the generated class' accessibility level.
Required: No.
Default settings: None.
Supported target languages: C#

%map SMC states are grouped into maps. The %map followed by a %% pair groups the states appearing within.