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polars strip-chars: Allow any polars expression for pattern argument (#15178)

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# Description 
Allow any polars expression for pattern argument for `polars
strip-chars`
This commit is contained in:
Jack Wright 2025-02-25 15:59:02 -08:00 committed by GitHub
parent 53d30ee7ea
commit 7939fb05ea
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GPG Key ID: B5690EEEBB952194
1 changed files with 34 additions and 4 deletions
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38
crates/nu_plugin_polars/src/dataframe/command/string/str_strip_chars.rs
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@ -12,6 +12,7 @@ use nu_protocol::{
Category, Example, LabeledError, PipelineData, ShellError, Signature, Span, SyntaxShape, Type,
Value,
};
use polars::prelude::Expr;
#[derive(Clone)]
pub struct StrStripChars;
@ -29,7 +30,11 @@ impl PluginCommand for StrStripChars {
fn signature(&self) -> Signature {
Signature::build(self.name())
.required("pattern", SyntaxShape::String, "Characters to strip")
.required(
"pattern",
SyntaxShape::Any,
"Characters to strip as either a string or polars expression",
)
.switch("start", "Strip from start of strings only", Some('s'))
.switch("end", "Strip from end of strings only", Some('e'))
.input_output_types(vec![(
@ -60,6 +65,26 @@ impl PluginCommand for StrStripChars {
.into_value(Span::test_data()),
),
},
Example {
description:
"Strip characters from both ends of strings in a column using an expression",
example: r#"[[text]; ["!!!hello!!!"] ["!!!world!!!"] ["!!!test!!!"]] | polars into-df | polars select (polars col text | polars str-strip-chars (polars lit "!")) | polars collect"#,
result: Some(
NuDataFrame::try_from_columns(
vec![Column::new(
"text".to_string(),
vec![
Value::test_string("hello"),
Value::test_string("world"),
Value::test_string("test"),
],
)],
None,
)
.expect("simple df for test should not fail")
.into_value(Span::test_data()),
),
},
Example {
description: "Strip characters from end of strings in a column",
example: r#"[[text]; ["hello!!!"] ["world!!!"] ["test!!!"]] | polars into-df | polars select (polars col text | polars str-strip-chars --end "!") | polars collect"#,
@ -123,12 +148,17 @@ fn command_expr(
call: &EvaluatedCall,
expr: NuExpression,
) -> Result<PipelineData, ShellError> {
let pattern: String = call.req(0)?;
let pattern_expr: Expr = call
.req::<Value>(0)
.and_then(|ref v| NuExpression::try_from_value(plugin, v))
.or(call
.req::<String>(0)
.map(polars::prelude::lit)
.map(NuExpression::from))?
.into_polars();
let strip_start = call.has_flag("start")?;
let strip_end = call.has_flag("end")?;
let pattern_expr = polars::prelude::lit(pattern);
let res: NuExpression = if strip_start {
// Use strip_chars_start when --start flag is provided
expr.into_polars()