138 lines
4.5 KiB
Rust
138 lines
4.5 KiB
Rust
use nu_protocol::{
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ast::Call,
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engine::{Command, EngineState, Stack},
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Category, Example, PipelineData, ShellError, Signature, Span, Value,
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};
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use super::super::values::{Column, NuDataFrame};
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#[derive(Clone)]
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pub struct Dummies;
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impl Command for Dummies {
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fn name(&self) -> &str {
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"dfr to-dummies"
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}
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fn usage(&self) -> &str {
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"Creates a new dataframe with dummy variables"
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}
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fn signature(&self) -> Signature {
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Signature::build(self.name()).category(Category::Custom("dataframe".into()))
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}
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fn examples(&self) -> Vec<Example> {
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vec![
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Example {
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description: "Create new dataframe with dummy variables from a dataframe",
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example: "[[a b]; [1 2] [3 4]] | dfr to-df | dfr to-dummies",
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result: Some(
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NuDataFrame::try_from_columns(vec![
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Column::new(
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"a_1".to_string(),
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vec![Value::test_int(1), Value::test_int(0)],
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),
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Column::new(
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"a_3".to_string(),
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vec![Value::test_int(0), Value::test_int(1)],
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),
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Column::new(
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"b_2".to_string(),
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vec![Value::test_int(1), Value::test_int(0)],
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),
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Column::new(
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"b_4".to_string(),
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vec![Value::test_int(0), Value::test_int(1)],
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),
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])
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.expect("simple df for test should not fail")
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.into_value(Span::test_data()),
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),
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},
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Example {
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description: "Create new dataframe with dummy variables from a series",
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example: "[1 2 2 3 3] | dfr to-df | dfr to-dummies",
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result: Some(
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NuDataFrame::try_from_columns(vec![
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Column::new(
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"0_1".to_string(),
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vec![
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Value::test_int(1),
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Value::test_int(0),
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Value::test_int(0),
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Value::test_int(0),
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Value::test_int(0),
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],
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),
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Column::new(
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"0_2".to_string(),
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vec![
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Value::test_int(0),
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Value::test_int(1),
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Value::test_int(1),
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Value::test_int(0),
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Value::test_int(0),
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],
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),
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Column::new(
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"0_3".to_string(),
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vec![
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Value::test_int(0),
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Value::test_int(0),
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Value::test_int(0),
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Value::test_int(1),
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Value::test_int(1),
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],
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),
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])
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.expect("simple df for test should not fail")
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.into_value(Span::test_data()),
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),
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},
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]
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}
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fn run(
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&self,
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engine_state: &EngineState,
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stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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command(engine_state, stack, call, input)
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}
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}
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fn command(
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_engine_state: &EngineState,
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_stack: &mut Stack,
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call: &Call,
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input: PipelineData,
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) -> Result<PipelineData, ShellError> {
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let df = NuDataFrame::try_from_pipeline(input, call.head)?;
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df.as_ref()
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.to_dummies()
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.map_err(|e| {
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ShellError::SpannedLabeledErrorHelp(
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"Error calculating dummies".into(),
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e.to_string(),
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call.head,
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"The only allowed column types for dummies are String or Int".into(),
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)
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})
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.map(|df| PipelineData::Value(NuDataFrame::dataframe_into_value(df, call.head), None))
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}
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#[cfg(test)]
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mod test {
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use super::super::super::test_dataframe::test_dataframe;
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use super::*;
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#[test]
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fn test_examples() {
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test_dataframe(vec![Box::new(Dummies {})])
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}
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}
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