Maybe you've asked the IBM RFE site to send you an email when someone posts an RFE, I have done so for PL/I, TSO, HLASM, ISPF, and SDSF, and at the last few weeks I've been bombarded (in the nice sense) with emails like

RFE created ID:149399 ISPF Edit highlighting for ACS routines

all posted by Tom Conley, who's been very busy writing REXX code to add highlighting to numerous languages. The results of his efforts can be found, among other goodies, in

File # 967 CBT Usermods Collection for ISPF (CUCI)

<http://www.cbttape.org/ftp/cbt/CBT967.zip>

And I've contributes a little code to it to make it easier to maintain.

However...

Why can't we ask IBM to open the source of the (little?) part of ISPF that handles language highglighting, or provide an exit to call a user supplied load module?

As useful as Tom's code is, it quite likely has a considerable overhead, and unlike the native ISPF code, it can only look at a screenful of data, which means that it's highly likely to result in flagging unmatched parentheses/brackets, etc...

Robert
--
Robert AH Prins
robert.ah.prins(a)gmail.com
The hitchhiking grandfather - https://prino.neocities.org/
Some REXX code for use on z/OS - https://prino.neocities.org/zOS/zOS-Tools.html

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