The TSO paradigm (including its protege Clist) is unique among interactive applications in allowing for three kinds of parameters:
-- Positional, which must appear first in the order specified in the model -- Simple keywords, which can appear anywhere after positionals and take on only their own name or null as value -- Value keywords, which can appear anywhere after positionals and take on the value specified in parentheses tso-command pos1 pos2 pos3 simple1 value-kwd1() value-kwd2() simple2 simple3 ... Rexx does not have all three types parameters, but folks have written (fairly elaborate) routines that simulate TSO/Clist processing. One power of TSO commands is that these keywords are managed by the command processor itself. Prompting to resolve ambiguity, for example, is handled before user code gets control. Once the user-written code gets control, all parameters are presented to it. Any further prompting would be to resolve logical incongruities, not structural. All this comes at the expense of the command writer, who must satisfy some pretty rigorous requirements to make the command work as intended. It can take a while for the occasional command writer to get it right. ;-) . . J.O.Skip Robinson Southern California Edison Company Electric Dragon Team Paddler SHARE MVS Program Co-Manager 626-302-7535 Office 323-715-0595 Mobile jo.skip.robin...@sce.com From: Walt Farrell <walt.farr...@gmail.com> To: IBM-MAIN@LISTSERV.UA.EDU, Date: 06/30/2014 08:49 AM Subject: Re: IKJPOSIT question Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> On Mon, 30 Jun 2014 11:19:40 -0400, John Gilmore <jwgli...@gmail.com> wrote: >No! > >Positional and keyword arguments may be "freely interspersed" in macro >instructions. We're not talking about macro instruction operands. We're talking about the macro instructions that define operands of TSO commands, and for TSO commands the user must specify all the positional operands before any of the keyword operands. -- Walt ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
