Re: New parser version outputs in Prolog format!

[cowan@snark.thyrsus.com (John Cowan)]

> I'm very happy with it; it should prove quite handy for any future NLP work
> on Lojban. The one point I can think of: compounds already handled by the
> lexer in the parser will show up as such, won't they? For example, {.ije}
> won't be analysed as I+JE, but as LEXER_S or whichever lexer it is. Given
> the vagaries of YACC parsing, that's fair. 

With the -f option, it comes out both ways.  I no longer downcase selma'o
names, but I continue to downcase inserted terminators.  Your example also
stepped on a bug that would produce non-Prolog atoms on certain occasions.

Here's another example:

36 c:/parser> parser -p -f
2;4;33moi ke lojbo genturfa'i
Copyright 1991,1992,1993 The Logical Languages Group, Inc.  All Rights Reserved
>>> prami .ije blanu
text_0(text_A_1(text_B_2(text_C_3(paragraphs_4(paragraph_10(paragraph_10(
paragraph_A_11(paragraph_B_12(utterance_20(sentence_40(bridi_tail_50(
bridi_tail_A_51(bridi_tail_B_52(bridi_tail_C_53(selbri_130(selbri_A_131(
selbri_B_132(selbri_C_133(selbri_D_134(selbri_E_135(selbri_F_136(
tanru_unit_150(tanru_unit_A_151(tanru_unit_B_152(bridi_valsi_407(
bridi_valsi_A_408(BRIVLA(prami))))))))))))),tail_terms_71(vau(vau)))))))))
)),I_819(lexer_S__i_or_ijek_(I(i),simple_JOIK_JEK_957(JA(je)))),
paragraph_A_11(paragraph_B_12(utterance_20(sentence_40(bridi_tail_50(
bridi_tail_A_51(bridi_tail_B_52(bridi_tail_C_53(selbri_130(selbri_A_131(
selbri_B_132(selbri_C_133(selbri_D_134(selbri_E_135(selbri_F_136(
tanru_unit_150(tanru_unit_A_151(tanru_unit_B_152(bridi_valsi_407(
bridi_valsi_A_408(BRIVLA(blanu))))))))))))),tail_terms_71(vau(vau)))))))))
))))))).
Space used: 5200 bytes for tokens, 100 bytes for strings

Note the functor "lexer_S___i_or_ijek_" and its parts.  So you can analyze
at the lexer-compound level or at the single cmavo level.  This works
because there is only one kind of node inside the parser, and the YACC
subsystem simply doesn't care if "yylval" is a singleton node or a node
with lots of subnodes which represent preparser results.

> The output will in fact prove helpful not only to NLP workers, but to people
> learning Lojban in general. I can't think of any way to improve output format
> that wouldn't turn out implausible. However, the display option -r of the 
> current parser should be retained alongside it, I feel; some will find it
> easier to read.

I have changed the Prolog format to -p.  I can reinstitute the current -r
if there's demand.

-- 
John Cowan	cowan@snark.thyrsus.com		...!uunet!lock60!snark!cowan
			e'osai ko sarji la lojban.