[m-users.] Trying out https://github.com/juliensf/mercury-csv

[Julien Fischer]

On Tue, 2 May 2017, Jovon Tan wrote:

> Ah, yes, that does it. Thanks, Julien.
> By the way, thanks for your mercury-csv package too.

You're welcome.

Cheers,
Julien.

> 
> On 2 May 2017 at 12:26, Julien Fischer <jfischer at opturion.com> wrote:
>
>       Hi,
>
>       On Tue, 2 May 2017, Jovon Tan wrote:
>
>             I'm new to mercury and I'm trying to process CSV data using the package
>               https://github.com/juliensf/mercury-csv
>
>             The next paragraph is my test code and mmc is giving me this error.
>                 test_raw_csv.m:034:   type error: unsatisfied typeclass constraint:
>                 test_raw_csv.m:034:     `stream.reader(csv.raw_reader(io.input_stream), csv.record, io.state, Error)'
>             May I know how I should fix my code? Thanks.
>
>             %-----------------------------------------------------------------------------%
>             % Program: test_raw_csv.m
>             % Purpose: Read CSV content from stdin and print as raw records to stdout.
>
>             :- module test_raw_csv.
>             :- interface.
>             :- import_module io.
>             :- pred main(io::di, io::uo) is det.
>
>             :- implementation.
>
>             :- import_module csv.
>             :- import_module stream.
>
>             %-----------------------------------------------------------------------------%
>
>             main(!IO) :-
>                 io.stdin_stream(Input, !IO),
>                 process_csv(Input, !IO).
>
>             :- pred process_csv(io.text_input_stream::in, io::di, io::uo) is det.
>             process_csv(Input, !IO) :-
>                 csv.init_raw_reader(Input, Reader, !IO),
>                 stream.input_stream_fold_state(Reader, writer, _Result, !IO).
>
>             :- pred writer(record::in, io::di, io::uo) is det.
> 
>
>       The raw CSV reader produces values of type 'raw_record' rather than
>       'record', so you need ot change the declaration of writer/3 to:
>
>          :- pred writer(raw_record, io::d, io::uo) is det.
>
>       Cheers,
>       Julien.
> 
> 
> 
>