taskLiberty Eiffel - Tasks: task #16118, CSV library


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task #16118: CSV library

Submitter:  Paolo Redaelli <Tybor>
Submitted:  Sun 06 Feb 2022 09:54:58 PM UTC
Should Start On:  Sun 06 Feb 2022 12:00:00 AM UTC Should be Finished on:  Sun 06 Feb 2022 12:00:00 AM UTC
Category:  other Priority:  5 - Normal
Status:  Need Info Percent Complete:  0%
Assigned to:  None Open/Closed:  Open
Fixed Release:  None Planned Release:  None
Effort:  0.00

Wed 09 Feb 2022 08:01:10 AM UTC, comment #3: 

The RFC I referenced covers most of your wishes. Beware of scope creep ;)

- <_92048>
Mon 07 Feb 2022 06:44:06 PM UTC, comment #2: 

I would even propose to be a bit more flexible :-)  Clearly the referenced RFC should be perfectly parseable, but we should not limit it to that. I have seen so many "CSV" files with a separator ; or <TAB>, and in many situations we have numbers in CSV files, which shall be localizable and use e. g. the "famous" German , as decimal separator.

Some CSV files have a big header section with "an unknown number of lines of bla bla", some have column headers, others not.

All this should ideally be supported and even auto-detected.

So in my eyes we need a few classes to describe the structure of the table, that we can index with a column name. And as we are in an object oriented language it should be easy to create a custom "row" class - for whatever a row represents.

If you ask me, we could make this a nice trial for test driven development: let's agree on a set of example csv files that shall be readable and some interface on how to access the data. And as soon as we have enough failing test cases start to do some coding.

What do you think?

Raphael Mack <ramack>
Group administrator
Mon 07 Feb 2022 07:43:46 AM UTC, comment #1: 

Indeed, quite a surprise...

We all know what a CSV file is supposed to look like, yet I wonder which of the existing standards we should use for implementation?  The strict RFC-4180 (see https://www.ietf.org/rfc/rfc4180.txt)?  I vote for that one, as this is also the basis for a corresponding web MIME-type.

- <_92048>
Sun 06 Feb 2022 09:54:58 PM UTC, original submission:  

Liberty Eiffel does not offer a Comma Separated Value library.

Paolo Redaelli <Tybor>
Group administrator


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