forked from extern/nushell
108 lines
3.2 KiB
Rust
108 lines
3.2 KiB
Rust
use crate::prelude::*;
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use nu_engine::WholeStreamCommand;
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use nu_errors::ShellError;
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use nu_protocol::{
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dataframe::{Column, NuDataFrame},
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Signature, SyntaxShape, UntaggedValue, Value,
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};
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use nu_source::Tagged;
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use super::utils::parse_polars_error;
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pub struct DataFrame;
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impl WholeStreamCommand for DataFrame {
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fn name(&self) -> &str {
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"dataframe with-column"
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}
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fn usage(&self) -> &str {
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"[DataFrame] Adds a series to the dataframe"
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}
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fn signature(&self) -> Signature {
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Signature::build("dataframe with-column")
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.required("series", SyntaxShape::Any, "series to be added")
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.required_named("name", SyntaxShape::String, "column name", Some('n'))
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}
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fn run(&self, args: CommandArgs) -> Result<OutputStream, ShellError> {
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command(args)
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}
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fn examples(&self) -> Vec<Example> {
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vec![Example {
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description: "Adds a series to the dataframe",
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example:
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"[[a b]; [1 2] [3 4]] | dataframe to-df | dataframe with-column ([5 6] | dataframe to-df) --name c",
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result: Some(vec![NuDataFrame::try_from_columns(
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vec![
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Column::new(
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"a".to_string(),
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vec![
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UntaggedValue::int(1).into(),
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UntaggedValue::int(3).into(),
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],
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),
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Column::new(
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"b".to_string(),
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vec![
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UntaggedValue::int(2).into(),
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UntaggedValue::int(4).into(),
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],
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),
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Column::new(
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"c".to_string(),
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vec![
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UntaggedValue::int(5).into(),
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UntaggedValue::int(6).into(),
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],
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),
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],
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&Span::default(),
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)
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.expect("simple df for test should not fail")
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.into_value(Tag::default())]),
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}]
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}
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}
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fn command(mut args: CommandArgs) -> Result<OutputStream, ShellError> {
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let tag = args.call_info.name_tag.clone();
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let value: Value = args.req(0)?;
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let name: Tagged<String> = args.req_named("name")?;
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let df = match value.value {
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UntaggedValue::DataFrame(df) => Ok(df),
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_ => Err(ShellError::labeled_error(
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"Incorrect type",
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"can only add a series to a dataframe",
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value.tag.span,
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)),
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}?;
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let mut series = df.as_series(&value.tag.span)?;
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let series = series.rename(&name.item).clone();
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let (mut df, _) = NuDataFrame::try_from_stream(&mut args.input, &tag.span)?;
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df.as_mut()
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.with_column(series)
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.map_err(|e| parse_polars_error::<&str>(&e, &tag.span, None))?;
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Ok(OutputStream::one(df.into_value(tag)))
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}
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#[cfg(test)]
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mod tests {
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use super::DataFrame;
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use super::ShellError;
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#[test]
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fn examples_work_as_expected() -> Result<(), ShellError> {
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use crate::examples::test_dataframe as test_examples;
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test_examples(DataFrame {})
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}
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}
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