@Peter: If you could locate it and could offer to work it up once I
provide the syntax, that and Ruslan Z.'s example will be enough to
justify making "forgiving tokens" my top priority. -- jeffrey
On 01/07/2014 02:35 PM, Peter Stuifzand wrote:
Some time I had an example where LTM did an unexpected thing. I should
be on the list somewhere. It could be a starting point for a test case
perhaps.
Peter
On Jan 7, 2014 11:25 PM, Jeffrey Kegler
<[email protected]> wrote:
I call the "backtrack" mode, "forgiving" mode. The term
"backtrack" is overloaded in the parsing context.
Marpa::R2 has come very close to allowing a "forgiving" flag for
tokens. In a previous version it was "implemented", but not
tested or documented. I put "implemented" in quotes, because
often documentation and testing reveals that an
already-implemented feature is not quite as fully implemented as
I'd imagined.
If someone will commit to writing a test case for forgiving mode,
I will put other stuff aside and make implementing it my next
priority. Wrt the test case: make it a good one, but don't worry
about the packaging -- I'll redo all that anyway when I put it in
the test suite. Also, you may not want to start on it until I
settle on the syntax -- just let me know that you're interested in
doing it.
-- jeffrey
On 01/07/2014 01:47 PM, Ruslan Zakirov wrote:
On Wed, Jan 8, 2014 at 1:16 AM, Ron Savage <[email protected]
<mailto:[email protected]>> wrote:
Sometimes I catch myself assuming that LTM failures backtrack
and try a shorter match, the same way I assume it for regexps.
And sometimes I don't catch myself assuming that :-((.
Well, regexps have nobacktrack mode, so tokenizer can have
optional backtrack mode.
Played a little with "longest expected token match" a little in
Repa and it helped me get rid of a grammar workaround I had, so
it proves itself to be useful. Combining this with per token flag
may be even more powerful.
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