14.2.1 Overview

DEFINE _macro_name_([_argument_[/_argument_]…])
… _body_ …
!ENDDEFINE.

Each argument takes the following form:

{_!arg_name_ = _|_ !POSITIONAL}
[!DEFAULT(_default_)]
[!NOEXPAND]
{!TOKENS(_count_) _|_ !CHAREND('_token_ ') _|_ !ENCLOSE('_start_ ' _|_ '_end_ ') _|_ !CMDEND}

The following directives may be used within body :

!OFFEXPAND
!ONEXPAND

The following functions may be used within the body:

!BLANKS(_count_)
!CONCAT(_arg_ …)
!EVAL(_arg_)
!HEAD(_arg_)
!INDEX(_haystack_ , _needle_)
!LENGTH(_arg_)
!NULL
!QUOTE(_arg_)
!SUBSTR(_arg_ , _start_[, _count_])
!TAIL(_arg_)
!UNQUOTE(_arg_)
!UPCASE(_arg_)

The body may also include the following constructs:

!IF (_condition_) !THEN _true-expansion_ !ENDIF
!IF (_condition_) !THEN _true-expansion_ !ELSE _false-expansion_ !ENDIF

!DO _!var_ = _start_ !TO _end_ [!BY _step_]
  _body_
!DOEND
!DO _!var_ !IN (_expression_)
  _body_
!DOEND

!LET _!var_ = _expression_