git.delta.rocks / jrsonnet / refs/commits / 5f620e2b9aa7

1use jrsonnet_evaluator::{2	error::Result,3	function::{builtin, CallLocation, FuncVal},4	throw,5	typed::Any,6	val::ArrValue,7	Context, Val,8};9use jrsonnet_gcmodule::Cc;1011#[derive(Copy, Clone)]12enum SortKeyType {13	Number,14	String,15	Unknown,16}1718#[derive(PartialEq)]19struct NonNaNf64(f64);20impl PartialOrd for NonNaNf64 {21	fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {22		self.0.partial_cmp(&other.0)23	}24}25impl Eq for NonNaNf64 {}26impl Ord for NonNaNf64 {27	fn cmp(&self, other: &Self) -> std::cmp::Ordering {28		self.partial_cmp(other).expect("non nan")29	}30}3132fn get_sort_type<T>(33	values: &mut [T],34	key_getter: impl Fn(&mut T) -> &mut Val,35) -> Result<SortKeyType> {36	let mut sort_type = SortKeyType::Unknown;37	for i in values.iter_mut() {38		let i = key_getter(i);39		match (i, sort_type) {40			(Val::Str(_), SortKeyType::Unknown) => sort_type = SortKeyType::String,41			(Val::Num(_), SortKeyType::Unknown) => sort_type = SortKeyType::Number,42			(Val::Str(_), SortKeyType::String) | (Val::Num(_), SortKeyType::Number) => {}43			(Val::Str(_) | Val::Num(_), _) => {44				throw!("sort elements should have the same types")45			}46			_ => throw!("sort key should either be a string or a number"),47		}48	}49	Ok(sort_type)50}5152/// * `key_getter` - None, if identity sort required53pub fn sort(ctx: Context, values: Cc<Vec<Val>>, key_getter: FuncVal) -> Result<Cc<Vec<Val>>> {54	if values.len() <= 1 {55		return Ok(values);56	}57	if key_getter.is_identity() {58		// Fast path, identity key getter59		let mut values = (*values).clone();60		let sort_type = get_sort_type(&mut values, |k| k)?;61		match sort_type {62			SortKeyType::Number => values.sort_unstable_by_key(|v| match v {63				Val::Num(n) => NonNaNf64(*n),64				_ => unreachable!(),65			}),66			SortKeyType::String => values.sort_unstable_by_key(|v| match v {67				Val::Str(s) => s.clone(),68				_ => unreachable!(),69			}),70			SortKeyType::Unknown => unreachable!(),71		};72		Ok(Cc::new(values))73	} else {74		// Slow path, user provided key getter75		let mut vk = Vec::with_capacity(values.len());76		for value in values.iter() {77			vk.push((78				value.clone(),79				key_getter.evaluate(80					ctx.clone(),81					CallLocation::native(),82					&(Any(value.clone()),),83					true,84				)?,85			));86		}87		let sort_type = get_sort_type(&mut vk, |v| &mut v.1)?;88		match sort_type {89			SortKeyType::Number => vk.sort_by_key(|v| match v.1 {90				Val::Num(n) => NonNaNf64(n),91				_ => unreachable!(),92			}),93			SortKeyType::String => vk.sort_by_key(|v| match &v.1 {94				Val::Str(s) => s.clone(),95				_ => unreachable!(),96			}),97			SortKeyType::Unknown => unreachable!(),98		};99		Ok(Cc::new(vk.into_iter().map(|v| v.0).collect()))100	}101}102103#[builtin]104#[allow(non_snake_case)]105pub fn builtin_sort(ctx: Context, arr: ArrValue, keyF: Option<FuncVal>) -> Result<ArrValue> {106	if arr.len() <= 1 {107		return Ok(arr);108	}109	Ok(ArrValue::Eager(super::sort::sort(110		ctx,111		arr.evaluated()?,112		keyF.unwrap_or_else(FuncVal::identity),113	)?))114}