2015-01-26 3:33 GMT-03:00 Sven Van Caekenberghe <sven@stfx.eu>:

> On 26 Jan 2015, at 06:32, Hern��n Morales Durand <hernan.morales@gmail.com> wrote:
>
>
>
> 2015-01-23 18:00 GMT-03:00 Sven Van Caekenberghe <sven@stfx.eu>:
>
> > On 23 Jan 2015, at 20:53, Hern��n Morales Durand <hernan.morales@gmail.com> wrote:
> >
> > Hi Sven,
> >
> > 2015-01-23 16:06 GMT-03:00 Sven Van Caekenberghe <sven@stfx.eu>:
> > Hi Hern��n,
> >
> > > On 23 Jan 2015, at 19:50, Hern��n Morales Durand <hernan.morales@gmail.com> wrote:
> > >
> > > I used to use a CSV parser from Squeak where I could attach conditional iterations:
> > >
> > > csvParser rowsSkipFirst: 2 do: [: row | " some action ignoring first 2 fields on each row " ].
> > > csvParser rowsSkipLast: 2 do: [: row | " some action ignoring last 2 fields on each row " ].
> >
> > With NeoCSVParser you can describe how each field is read and converted, using the same mechanism you can ignore fields. Have a look at the senders of #addIgnoredField from the unit tests.
> >
> >
> > I am trying to understand the implementation, I see you included #addIgnoredFields: for consecutive fields in Neo-CSV-Core-SvenVanCaekenberghe.21
> > A question about usage then, adding ignored field(s) requires adding field types on all other remaining fields?
>
> Yes, like this:
>
> testReadWithIgnoredField
>�� | input |
>�� input := (String crlf join: #( '1,2,a,3' '1,2,b,3' '1,2,c,3' '')).
>�� self
>�� assert: ((NeoCSVReader on: input readStream)
>�� addIntegerField;
>�� addIntegerField;
>�� addIgnoredField;
>�� addIntegerField;
>�� upToEnd)
>�� equals: {
>�� #(1 2 3).
>�� #(1 2 3).
>�� #(1 2 3).}
>
>
>
> May be you like to know if you make a pass to NeoCSV, for some data sets I have 1 million of columns, it would be nice an addFieldsInterval: or such.

1 million columns ? How is that possible, useful ?

The reader is like a builder. You could try to do this yourself by writing a little loop or two.

But still, 1 million ?

> Thank you.
>
> Hern��n
>