git.delta.rocks / jrsonnet / refs/commits / d91bf0e3d51a

234	/// For arrays, nothing will be copied on this call, instead [`ArrValue::Slice`] view will be returned.234	/// For arrays, nothing will be copied on this call, instead [`ArrValue::Slice`] view will be returned.
235	pub fn slice(235	pub fn slice(
236		self,236		self,
237		index: Option<BoundedUsize<0, { i32::MAX as usize }>>,237		index: Option<i32>,
238		end: Option<BoundedUsize<0, { i32::MAX as usize }>>,238		end: Option<i32>,
239		step: Option<BoundedUsize<1, { i32::MAX as usize }>>,239		step: Option<BoundedUsize<1, { i32::MAX as usize }>>,
240	) -> Result<Self> {240	) -> Result<Self> {
241		match &self {241		match &self {
242			IndexableVal::Str(s) => {242			IndexableVal::Str(s) => {
243				let mut computed_len = None;
243				let index = index.as_deref().copied().unwrap_or(0);244				let mut get_len = || {
245					computed_len.map_or_else(
246						|| {
247							let len = s.chars().count();
248							let _ = computed_len.insert(len);
249							len
250						},
251						|len| len,
252					)
253				};
254				let mut get_idx = |pos: Option<i32>, default| {
255					match pos {
256						Some(v) if v < 0 => get_len().saturating_sub((-v) as usize),
257						// No need to clamp, as iterator interface is used
258						Some(v) => v as usize,
259						None => default,
260					}
261				};
262
263				let index = get_idx(index, 0);
244				let end = end.as_deref().copied().unwrap_or(usize::MAX);264				let end = get_idx(end, usize::MAX);
245				let step = step.as_deref().copied().unwrap_or(1);265				let step = step.as_deref().copied().unwrap_or(1);
246266
247				if index >= end {267				if index >= end {
258				))278				))
259			}279			}
260			IndexableVal::Arr(arr) => {280			IndexableVal::Arr(arr) => {
261				let index = index.as_deref().copied().unwrap_or(0);281				let get_idx = |pos: Option<i32>, len: usize, default| match pos {
282					Some(v) if v < 0 => len.saturating_sub((-v) as usize),
283					Some(v) => (v as usize).min(len),
284					None => default,
285				};
286				let index = get_idx(index, arr.len(), 0);
262				let end = end.as_deref().copied().unwrap_or(usize::MAX).min(arr.len());287				let end = get_idx(end, arr.len(), arr.len());
263				let step = step.as_deref().copied().unwrap_or(1);288				let step = step.as_deref().copied().unwrap_or(1);
264289
265				if index >= end {290				if index >= end {

47#[builtin]47#[builtin]
48pub fn builtin_slice(48pub fn builtin_slice(
49	indexable: IndexableVal,49	indexable: IndexableVal,
50	index: Option<BoundedUsize<0, { i32::MAX as usize }>>,50	index: Option<i32>,
51	end: Option<BoundedUsize<0, { i32::MAX as usize }>>,51	end: Option<i32>,
52	step: Option<BoundedUsize<1, { i32::MAX as usize }>>,52	step: Option<BoundedUsize<1, { i32::MAX as usize }>>,
53) -> Result<Val> {53) -> Result<Val> {
54	indexable.slice(index, end, step).map(Val::from)54	indexable.slice(index, end, step).map(Val::from)