nushell/crates/nu-command/src/dataframe/series/string/concatenate.rs
2022-04-19 00:34:10 +12:00

116 lines
3.1 KiB
Rust

use super::super::super::values::{Column, NuDataFrame};
use nu_engine::CallExt;
use nu_protocol::{
ast::Call,
engine::{Command, EngineState, Stack},
Category, Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Value,
};
use polars::prelude::IntoSeries;
#[derive(Clone)]
pub struct Concatenate;
impl Command for Concatenate {
fn name(&self) -> &str {
"dfr concatenate"
}
fn usage(&self) -> &str {
"Concatenates strings with other array"
}
fn signature(&self) -> Signature {
Signature::build(self.name())
.required(
"other",
SyntaxShape::Any,
"Other array with string to be concatenated",
)
.category(Category::Custom("dataframe".into()))
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Concatenate string",
example: r#"let other = ([za xs cd] | dfr to-df);
[abc abc abc] | dfr to-df | dfr concatenate $other"#,
result: Some(
NuDataFrame::try_from_columns(vec![Column::new(
"0".to_string(),
vec![
Value::test_string("abcza"),
Value::test_string("abcxs"),
Value::test_string("abccd"),
],
)])
.expect("simple df for test should not fail")
.into_value(Span::test_data()),
),
}]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
command(engine_state, stack, call, input)
}
}
fn command(
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<PipelineData, ShellError> {
let df = NuDataFrame::try_from_pipeline(input, call.head)?;
let other: Value = call.req(engine_state, stack, 0)?;
let other_span = other.span()?;
let other_df = NuDataFrame::try_from_value(other)?;
let other_series = other_df.as_series(other_span)?;
let other_chunked = other_series.utf8().map_err(|e| {
ShellError::GenericError(
"The concatenate only with string columns".into(),
e.to_string(),
Some(other_span),
None,
Vec::new(),
)
})?;
let series = df.as_series(call.head)?;
let chunked = series.utf8().map_err(|e| {
ShellError::GenericError(
"The concatenate only with string columns".into(),
e.to_string(),
Some(call.head),
None,
Vec::new(),
)
})?;
let mut res = chunked.concat(other_chunked);
res.rename(series.name());
NuDataFrame::try_from_series(vec![res.into_series()], call.head)
.map(|df| PipelineData::Value(NuDataFrame::into_value(df, call.head), None))
}
#[cfg(test)]
mod test {
use super::super::super::super::test_dataframe::test_dataframe;
use super::*;
#[test]
fn test_examples() {
test_dataframe(vec![Box::new(Concatenate {})])
}
}