csv2struct

Generates struct definitions from CSV using some very basic rules.

Example

```bash $ cat test.csv foo,bar,baz,qux 1,2,3,green 4.4,5,6,red 7.2,,8,blue

$ cat test.csv | csv2struct

[derive(Debug, Clone, Copy, Eq)]

pub struct Record { pub foo: f32, pub bar: Option, pub baz: i32, pub qux: Qux, }

[derive(Debug, Clone, Copy, Eq)]

pub enum Qux { Green, Red, Blue, } ```

There are two sets of rules at play. First, we apply the following set of rules to each value in each column and record the results.

if value == "" => Empty if let Some(_) = value.parse::<i32>() => Integer if let Some(_) = value.parse::<f32>() => Real else => Factor(value)

Next, we apply the following rules to the results for each column:

• If any of the values were parsed as Factor; then treat the column as a factor.
• Otherwise, if not all of the values were parsed as Integer; then treat the column as real.
• Otherwise, treat the column as integer.
• If any of the values were missing, then apply the above rules to the values that were present, and wrap the result in Option.

Finally, we generate a struct definition with one field for each column. For factors, we generate an enum as well.