[lojban] Re: parsing with error detection and recovery

["Jorge Llambías" <lojban-out@lojban.org>]

On 8/15/06, Chris Capel <pdf23ds@gmail.com> wrote:
> For instance, the morphology rules in the BPFK Peg Morphology[1] will
> only parse consonants that don't appear in invalid consonant clusters.
> If a consonant cluster is invalid, it will stop parsing. But by adding
> error rules for consonants that don't check the validity (that only
> get matched if the ones that do check don't match) or that check for
> specific kinds of invalid pairs, the output of the parser could be
> more likely to finish,

That part seems relatively easy to do:

Define a new top rule:

tolerant-text <- text / text-without-phonotactic-constraints

Make a copy of the full grammar with each rule name tagged with
"-without-phonotactic-constraints".

Eliminate the phonotactic constraints from the second set of rules.
These appear only in a few rules. for example, instead of:

c <- comma* [cC] !h !c !s !x !voiced

you will have:

c-without-phonotactic-constraints <- comma* [cC]

> and could tell the user why the cluster is
> invalid.

That may be harder to achieve.

mu'o mi'e xorxes


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