newRPL: Alpha demo 0.9 released [UPDATED 2017-10-25]

[Claudio L.]

(11-04-2017 05:17 AM)Claudio L. Wrote:  I'll comment on what's new in this ROM tomorrow, just wanted to give a heads-up in case somebody notices the files were updated and tries to flash them.

Few things to play with in this ROM:

• STO and RCL support for absolute paths using list of lists {{ }} for the paths.
• New EXIT command needs thorough testing (see below for explanation)
• IFT and IFTE were updated to use the ISTRUE operator, need thorough testing.
• New system flags to allow keyboard handler chaining.
  

The EXIT command:

• Will exit the current program, returning to the caller (not completely stopping RPL like KILL on the 50g)
• Inside a loop, it exits the loop
• Not affected by IF/CASE/IFERR, so it exits the program or loop in which the IF/CASE statement is in.
  

The new keyboard handler flags (I know who's going to like this
Flag -46 (FL_DODEFAULTKEY), is set to zero by the system right before calling a custom key handler. If the handler sets this flag to 1, the system will execute the default key handler immediately after.
Flag -45 (FL_NEXTCUSTOMKEY), is set to zero by the system right before calling a custom key handler. If the handler sets this flag to 1, the system will continue to look for another handler for the same key and run it.

An example:
<< 1 -46 SF >> "+" 0 ASNKEY
This handler puts a 1 on the stack, then sets flag -46 to indicate the default handler should be executed. Put a number on the stack, and pressing + will do << 1 >> << + >>, so it will be increased.

Now define another handler to chain the previous one:
<< 2 / -45 SF >> "+" 0 ASNKEY
Putting a number 4 on the stack and pressing + will do << 2 / >> << 1 >> << + >>, resulting in 3. The first handler will chain to the second one, which will chain to the default key.
To clean up this you'll need to remove both handlers with "+" DELKEY "+" DELKEY, since handlers will be erased one by one.
I think this makes for a huge improvement in key handler flexibility.

EDIT: In case you mess up your key definitions badly, you can disable custom keys through the menu (System/Keys) and programmatically setting flag -4.