Re: ml-lex example doesn't work

Maybe it's better to try the calc example in ml-yacc source code. It 
should be in directory smlnj/src/ml-yacc/examples/calc after installation.

I also noticed that that example has not been converted to the latest 
basis library but it's easy to change
"TextIO.inputLine TextIO.stdIn" to
"(fn SOME x => x | NONE => "") (TextIO.inputLine TextIO.stdIn)"
in calc.sml file.

Vesa

On Mon, 31 Jan 2005, Natalia Beatriz Bidart wrote:

> Hi,
> I'm a newbie in ML. I need to build a parser in ML, so I'm  learning ML-Lex 
> and ML-Yacc, but the sample 
> (http://www.smlnj.org/doc/ML-Lex/manual.html#sample) in the ML-Lex 
> documentation didn't work. What I got after generate the sml file was:
>
> [bn@DALI lex]$ sml calc.lex.sml
> Standard ML of New Jersey v110.52 [built: Sat Jan 29 11:24:27 2005]
> [opening calc.lex.sml]
> [autoloading]
> [autoloading done]
> calc.lex.sml:9.22-9.28 Error: unbound variable or constructor: output
> calc.lex.sml:9.29-9.36 Error: unbound variable or constructor: std_out
> calc.lex.sml:146.43-146.50 Error: unbound variable or constructor: revfold
> calc.lex.sml:144.9-144.12 Error: unbound variable or constructor: inc
> calc.lex.sml:146.61-146.81 Error: operator and operand don't agree [tycon 
> mismatch]
>  operator domain: char
>  operand:         string
>  in expression:
>    ord "0"
> /usr/local/sml/bin/sml: Fatal error -- Uncaught exception Error with 0
> raised at ../compiler/TopLevel/interact/evalloop.sml:63.48-63.56
>
> My first try was to comment the line "val error = fn x => output(std_out,x ^ 
> "\n")" and to add a dummy error definition, but I'm still getting:
>
> [bn@DALI lex]$ sml calc.lex.sml
> Standard ML of New Jersey v110.52 [built: Sat Jan 29 11:24:27 2005]
> [opening calc.lex.sml]
> [autoloading]
> [autoloading done]
> calc.lex.sml:146.43-146.50 Error: unbound variable or constructor: revfold
> calc.lex.sml:144.9-144.12 Error: unbound variable or constructor: inc
> calc.lex.sml:146.61-146.81 Error: operator and operand don't agree [tycon 
> mismatch]
>  operator domain: char
>  operand:         string
>  in expression:
>    ord "0"
> calc.lex.sml:152.38-152.84 Error: operator is not a function [tycon mismatch]
>  operator: string
>  in expression:
>    error ("calc: ignoring bad character " ^ yytext)
> /usr/local/sml/bin/sml: Fatal error -- Uncaught exception Error with 0
> raised at ../compiler/TopLevel/interact/evalloop.sml:63.48-63.56
>
> So I tried the revfold definition directly in the compiler but:
> - revfold;
> stdIn:1.1-1.8 Error: unbound variable or constructor: revfold
>
> What I found in http://www.smlnj.org/dist/release/110.0.7/110-HISTORY was:
>
> * the functions List.fold and List.revfold have been replaced by
> 	List.foldr and List.foldl.  Furthermore, they have the type:
>
> 	  (('a * 'b) -> 'b) -> 'b -> 'a list -> 'b
>
> 	I.e., the second and third arguments are swapped.
>
> So I'm wondering if the ML-Lex documentation is out-to-date and I have to 
> replace the revfold calls for something else, or I'm doing something wrong, 
> or something is missing (like a library?). I also don't know if the "output" 
> call is a function or not, if the "std_out" is a definition or not, etc.
>
> Can you please give a clue? Or a link whith the correct information?
> Thanks a lot, Natalia.
>
>
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