Struct len

pub struct len;

Gets the length of a container or range

builtin! fn len (list) -> IResult<ConValue>
{
    Ok(ConValue::Int(match list
    {
        ConValue::Empty => 0, ConValue::String(s) => s.chars().count() as _,
        ConValue::Ref(r) => return len.call(env, slice::from_ref(r.as_ref())),
        ConValue::Array(t) => t.len() as _, ConValue::Tuple(t) => t.len() as
        _, ConValue::RangeExc(start, end) => (end - start) as _,
        ConValue::RangeInc(start, end) => (end - start + 1) as _, _ =>
        Err(Error::TypeError)?,
    }))
}

Trait Implementations

impl BuiltIn for len

fn description(&self) -> &str

impl Callable for len

fn call(&self, env: &mut Environment, args: &[ConValue]) -> IResult<ConValue>

Calls this Callable in the provided Environment, with ConValue args
The Callable is responsible for checking the argument count and validating types

fn name(&self) -> Sym

Returns the common name of this identifier.

impl Clone for len

fn clone(&self) -> len

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for len

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.