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Add Tau constant (#2673)

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Adds Tau constant using meval::Context.

Also adds a test to match pi's.

Note: Tau ends up not being more precise than 2*pi.

Resolves: #2258
This commit is contained in:
rjboas
2020-10-22 10:16:51 +10:00
committed by GitHub
parent 3cf7652e86
commit cc06ea4d87
2 changed files with 15 additions and 1 deletions
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4
crates/nu-cli/src/commands/math/eval.rs
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@ -91,7 +91,9 @@ pub async fn eval(
}
pub fn parse<T: Into<Tag>>(math_expression: &str, tag: T) -> Result<Value, String> {
match meval::eval_str(math_expression) {
let mut ctx = meval::Context::new();
ctx.var("tau", std::f64::consts::TAU);
match meval::eval_str_with_context(math_expression, &ctx) {
Ok(num) if num.is_infinite() || num.is_nan() => Err("cannot represent result".to_string()),
Ok(num) => Ok(UntaggedValue::from(Primitive::from(num)).into_value(tag)),
Err(error) => Err(error.to_string().to_lowercase()),