> On 28 Sep 2015, at 17:21, Nicolai Hess <[hidden email]> wrote:
>
> Thanks Mariano, Sven
>
>
>
> 2015-09-28 16:42 GMT+02:00 Sven Van Caekenberghe <[hidden email]>:
>
> > On 28 Sep 2015, at 15:04, Mariano Martinez Peck <[hidden email]> wrote:
> >
> > Imagine something like this:
> >
> > neoCSVReader := (NeoCSVReader on: stream).
> >       neoCSVReader
> >               separator: $,;
> >               recordClass: PriceRecord;
> >               addIgnoredField; "<name>"
> >               addField:  #securityUniqueId: ; "<ticker>"
> >               addField: #date: converter: [ :string | Date readFrom: string readStream pattern: 'yyyymmdd' ]; "<date>"
> >               addFloatField: #open: ; "<open>"
> >               addFloatField: #high: ; "<high>"
> >               addFloatField: #low: ; "<low>"
> >               addFloatField: #close: ; "<close>"
> >               addIntegerField: #volume: . "<vol>"
> >       neoCSVReader    skipHeader.
> >       priceRecords := neoCSVReader upToEnd.
> >
> >
> > The #recordClass: is optional. If not, you can get an array of arrays instead.
> > You can add #addIgnoredField for all the ones you want to ignore, then add the #addNumber: etc for the number ones, etc.
>
> Correct.
>
> But I have to call addIgnoredField ~ 25 times.
> I hope there were a way to specifiy column index and field descirption only
> for those columns I am interested in.

NeoCSVReader>>#addIgnoredFields: count
        "Add a count of consecutive ignored fields to receiver."

;-)

>
> > To write a default empty value, I would use my own converter. Something like:
> >
> > addField: #stringcolumn: converter: [ :string | string isEmptyOrNil ifTrue: [ '' ]  ];
> > addField: #numbercolumn: converter: [ :string | string isEmptyOrNil ifTrue: [ 0 ] ifFalse: [ NeoNumberParser parse: string ]  ];
>
> Yes this helps
>
>
> Actually there is NeoCSVReader>>#emptyFieldValue: which you can use the configure the reader (but it counts for all fields).
>
>
>
>
> > Hope this helps.
>
>
>
>
> >
> > Cheers,
> >
> >
> >
> > On Mon, Sep 28, 2015 at 9:06 AM, Nicolai Hess <[hidden email]> wrote:
> > Hi,
> >
> > I have two problems I could not solve:
> >
> > 1. I would like to read only some columns: I have a large file with
> >     ~30 colums, but I am only interested on ~5 columns
> >     (not that important, I could pre-process the file) but anyway it would be
> >     nice to do it in smalltalk.
> >
> > 2. some columns will contain only strings (quoted values) and some only numbers,
> >     but the field may be empty, is it possible to define the default "emptyValue" as an
> >     - empty string for empty fields in the "string column"
> >     - 0 for empty fields in the "number column"?
> >
> >
> > thanks
> >  in advance
> >
> > nicolai
> >
> >
> >
> > --
> > Mariano
> > http://marianopeck.wordpress.com