[Bug] Red Dot Breakpoints Ignored - Recipe

Mark Wieder mwieder at ahsoftware.net
Wed Sep 2 23:10:07 EDT 2015

On 09/02/2015 07:50 PM, J. Landman Gay wrote:

> Today I finally saw my first instance of a pirate red dot breakpoint
> that didn't meet my previous criteria. I am initiated. This was in LC
> 7.0.6 which I have just started using more regularly. Prior to 7.x I had
> never seen it happen except when a script called into an IDE library.

The way the IDE's script editor handles these ephemeral breakpoints is 
pretty screwy. That's my story and I'm sticking to it.

The breakpoints are stored in one of two places: as a custom property of 
the preferences file if you're dealing with a global variable, or as a 
custom property of the owning stack if it's a local variable. The 
breakpoint is stored as objectID, lineNumber.

Breakpoint conditions are also stored as custom properties in the same 
places, but are stored as expression. There is no other context for the 
condition, it's just supposed to be indexed from the breakpoint list.

Thus you can have
button 1003 of card 1002, 14
button 1042 of card 1003, 7

x > 4
y = 5

If these get out of sync (you remove a condition, you have an error in 
your code that prevents the list from getting updated, etc) then they no 
longer match up and you have orphans.

Worse, since the conditions have no sense of scope, they will trigger 
when any handler in the indexed object meets that condition, i.e., even 
when the lists are synced properly, any handler in button 1003 will 
trigger the 'x > 4' condition if it contains an x variable.

  Mark Wieder
  ahsoftware at gmail.com

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