use crate::input_handler::{operate, CellPathOnlyArgs};
use nu_engine::CallExt;
use nu_protocol::{
ast::{Call, CellPath},
engine::{Command, EngineState, Stack},
Example, PipelineData, ShellError, Signature, Span, SyntaxShape, Type, Value,
};
#[derive(Clone)]
pub struct SubCommand;
impl Command for SubCommand {
fn name(&self) -> &str {
"into decimal"
}
fn signature(&self) -> Signature {
Signature::build("into decimal")
.input_output_types(vec![
(Type::String, Type::Number),
(Type::Bool, Type::Number),
])
.rest(
"rest",
SyntaxShape::CellPath,
"for a data structure input, convert data at the given cell paths",
)
}
fn usage(&self) -> &str {
"Convert text into a decimal"
}
fn search_terms(&self) -> Vec<&str> {
vec!["convert", "number", "floating"]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let cell_paths: Vec<CellPath> = call.rest(engine_state, stack, 0)?;
let args = CellPathOnlyArgs::from(cell_paths);
operate(action, args, input, call.head, engine_state.ctrlc.clone())
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Convert string to decimal in table",
example: "[[num]; ['5.01']] | into decimal num",
result: Some(Value::List {
vals: vec![Value::Record {
cols: vec!["num".to_string()],
vals: vec![Value::test_float(5.01)],
span: Span::test_data(),
}],
span: Span::test_data(),
}),
},
Example {
description: "Convert string to decimal",
example: "'1.345' | into decimal",
result: Some(Value::test_float(1.345)),
},
Example {
description: "Convert decimal to decimal",
example: "'-5.9' | into decimal",
result: Some(Value::test_float(-5.9)),
},
Example {
description: "Convert boolean to decimal",
example: "true | into decimal",
result: Some(Value::test_float(1.0)),
},
]
}
}
fn action(input: &Value, _args: &CellPathOnlyArgs, head: Span) -> Value {
match input {
Value::String { val: s, span } => {
let other = s.trim();
match other.parse::<f64>() {
Ok(x) => Value::float(x, head),
Err(reason) => Value::Error {
error: ShellError::CantConvert(
"float".to_string(),
reason.to_string(),
*span,
None,
),
},
}
}
Value::Int { val: v, span } => Value::float(*v as f64, *span),
Value::Bool { val: b, span } => Value::Float {
val: match b {
true => 1.0,
false => 0.0,
},
span: *span,
},
Value::Error { .. } => input.clone(),
other => Value::Error {
error: ShellError::OnlySupportsThisInputType(
"string, integer or bool".into(),
other.get_type().to_string(),
head,
other.expect_span(),
),
},
}
}
#[cfg(test)]
mod tests {
use super::*;
use nu_protocol::Type::Error;
#[test]
fn test_examples() {
use crate::test_examples;
test_examples(SubCommand {})
}
#[test]
#[allow(clippy::approx_constant)]
fn string_to_decimal() {
let word = Value::test_string("3.1415");
let expected = Value::test_float(3.1415);
let actual = action(&word, &CellPathOnlyArgs::from(vec![]), Span::test_data());
assert_eq!(actual, expected);
}
#[test]
fn communicates_parsing_error_given_an_invalid_decimallike_string() {
let decimal_str = Value::test_string("11.6anra");
let actual = action(
&decimal_str,
&CellPathOnlyArgs::from(vec![]),
Span::test_data(),
);
assert_eq!(actual.get_type(), Error);
}
#[test]
fn int_to_decimal() {
let decimal_str = Value::test_int(10);
let expected = Value::test_float(10.0);
let actual = action(
&decimal_str,
&CellPathOnlyArgs::from(vec![]),
Span::test_data(),
);
assert_eq!(actual, expected);
}
}