Dialog and Å-machine bugs

Authoring Dialog
1

Entering one very long word into dgdebug or the JS Å-machine interpreter exhausts the heap space. dgdebug will attempt to undo moves until the program eventually suspends. The JS interpreter is a bit different. Taking Tethered (running on Linus’s website) as an example, on the first move:

  • if a word of length 569 to 585 is entered, the heap will be exhausted, but the interpreter will be able to undo.
  • For words of length 586 to 614, the undo will fail and the interpreter will freeze.
  • For words of length 615 and above, an error is thrown in the console (ReferenceError: HEAPFULL is not defined) and the page refreshes.

For reference, I tested this in Firefox 70.0.1 and Chromium 78.0.3904.97.

It also seems like pressing the any of Delete, Insert, Page Up, or Page Down keys in dgdebug prints a tilde instead of deleting a character. I’m not sure if this is a problem with my system, but the delete key seems to work fine everywhere else, and the same behavior happens in both xterm and termite.

2

Thanks for reporting! There should probably be a reasonable limit enforced by the input field in the web interpreter. But I’ll fix the underlying problem first.

The problem with special input keys is due to custom line-editing code in dgdebug. I’ll fix that too.

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