HP TACL User Manual

Processing Arguments
Developing TACL Routines
3–12 107365 Tandem Computers Incorporated
The syntax for getargs is:
getargs triplet [ triplet ]...
where triplet contains three parts:
{}
REQUIRED
OPTIONAL
type variable
REQUIRED or OPTIONAL specifies whether the corresponding argument is
required or optional.
Type is an #ARGUMENT alternative such as FILENAME. The specified type
must not permit spaces. The KEYWORD alternative, for example, cannot be used
because it requires the WORDLIST alternative, which allows spaces in its syntax.
Variable is a name for the argument. Getargs stores the argument value in a
variable with this name. Getargs pushes variable and sets it if a matching
argument is found; otherwise, variable is empty.
The following statement asks getargs to search for two arguments—one required
number and one optional text constant:
getargs REQUIRED NUMBER numvar OPTIONAL TEXT datavar
If getargs finds a numeric argument, it pushes num and stores the argument into
num . If getargs finds a text argument, it pushes data and stores the argument in
data .
Figure 3-7. Assigning Values to Arguments (Page 1 of 2)
?SECTION getargs MACRO
== Loop through all triplets
[#IF [#EMPTY %1%] |THEN|
== No more triplets; routine must have no more arguments
SINK [#ARGUMENT END] == Only valid if called by a routine
|ELSE|
#PUSH %3% == Push the variable
== Check first word of triplet for REQUIRED or OPTIONAL
[#CASE %1%
|optional|
[#IF [#EMPTY %4%] |THEN| == Check for more triplets
== No more triplets; argument cannot be followed by
== a comma
[#CASE [#ARGUMENT/TEXT %3%/ %2% END]
|1|
SINK [#ARGUMENT END]
|2|
#SET %3%
|3|
]

HP TACL Specifications

General

Brand	HP
Model	TACL
Category	Software
Language	English