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use std::fmt::{self, Debug, Formatter};
use super::{CastInfo, FromValue, IntoValue, Reflect, Value};
use crate::diag::StrResult;
/// A value that indicates a smart default.
#[derive(Default, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
pub struct AutoValue;
impl IntoValue for AutoValue {
fn into_value(self) -> Value {
Value::Auto
}
}
impl FromValue for AutoValue {
fn from_value(value: Value) -> StrResult<Self> {
match value {
Value::Auto => Ok(Self),
_ => Err(Self::error(&value)),
}
}
}
impl Reflect for AutoValue {
fn describe() -> CastInfo {
CastInfo::Type("auto")
}
fn castable(value: &Value) -> bool {
matches!(value, Value::Auto)
}
}
impl Debug for AutoValue {
fn fmt(&self, f: &mut Formatter) -> fmt::Result {
f.pad("auto")
}
}
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