Let's stop parser Hell
David Piepgrass
qwertie256 at gmail.com
Sat Jul 7 18:15:29 PDT 2012
On Saturday, 7 July 2012 at 22:35:37 UTC, Roman D. Boiko wrote:
> On Saturday, 7 July 2012 at 22:25:00 UTC, David Piepgrass wrote:
>> This is all true, but forgetting a brace commonly results in a
>> barrage of error messages anyway. Code that guesses what you
>> meant obviously won't work all the time, and phase 3 would
>> have to take care not to emit an error message about a "{"
>> token that doesn't actually exist (that was merely
>> "guessed-in"). But at least it's nice for a parser to be
>> /able/ to guess what you meant; for a typical parser it would
>> be out of the question, upon detecting an error, to back up
>> four source lines, insert a brace and try again.
>
> So you simply admit that error recovery is difficult to
> implement. For me, it is a must-have, and thus throwing away
> information is bad.
I'm not seeing any tremendous error-handling difficulty in my
idea. Anyway, I missed the part about information being thrown
away...?
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