expandMacro

expandMacro( 
g_form 
) 
=> g_expandedForm

Description

Expands one level of macro call for a form.

Checks if the given form g_form is a macro call and returns the expanded form if it is. Otherwise it returns the original argument. The macro expansion is done only once (one level). That is, if the expanded form is another macro call, it is not further expanded (unless another expandMacro is called with the expanded form as its argument).

Arguments

Value Returned

Examples

mprocedure( testMsg(args)
    ‘(printf "test %s -- %L\n" ,(cadr args)progn(,@(cddr args))) )
=> testMsg

expandMacro( '(testMsg "alpha1" y = f(x) g(y 100)) )
=> printf("test %s -- %L\n" "alpha1"
        progn((y = (f x)) (g y 100)))

Related Topics

Function and Program Structure

defmacro