git.delta.rocks / jrsonnet / refs/commits / 4c3faa0f088c

1use std::{cmp::Ordering, rc::Rc};23use jrsonnet_gcmodule::{Cc, Trace};4use jrsonnet_interner::IStr;5use jrsonnet_parser::{6	ArgsDesc, AssertStmt, BindSpec, CompSpec, Expr, FieldMember, FieldName, ForSpecData,7	IfSpecData, LiteralType, LocExpr, Member, ObjBody, ParamsDesc,8};9use jrsonnet_types::ValType;1011use self::destructure::destruct;12use crate::{13	arr::ArrValue,14	destructure::evaluate_dest,15	error::ErrorKind::*,16	evaluate::operator::{evaluate_add_op, evaluate_binary_op_special, evaluate_unary_op},17	function::{CallLocation, FuncDesc, FuncVal},18	tb, throw,19	typed::Typed,20	val::{CachedUnbound, IndexableVal, StrValue, Thunk, ThunkValue},21	Context, GcHashMap, ObjValue, ObjValueBuilder, ObjectAssertion, Pending, Result, State,22	Unbound, Val,23};24pub mod destructure;25pub mod operator;2627pub fn evaluate_trivial(expr: &LocExpr) -> Option<Val> {28	fn is_trivial(expr: &LocExpr) -> bool {29		match &*expr.0 {30			Expr::Str(_)31			| Expr::Num(_)32			| Expr::Literal(LiteralType::False | LiteralType::True | LiteralType::Null) => true,33			Expr::Arr(a) => a.iter().all(is_trivial),34			Expr::Parened(e) => is_trivial(e),35			_ => false,36		}37	}38	Some(match &*expr.0 {39		Expr::Str(s) => Val::Str(StrValue::Flat(s.clone())),40		Expr::Num(n) => Val::Num(*n),41		Expr::Literal(LiteralType::False) => Val::Bool(false),42		Expr::Literal(LiteralType::True) => Val::Bool(true),43		Expr::Literal(LiteralType::Null) => Val::Null,44		Expr::Arr(n) => {45			if n.iter().any(|e| !is_trivial(e)) {46				return None;47			}48			Val::Arr(ArrValue::eager(Cc::new(49				n.iter()50					.map(evaluate_trivial)51					.map(|e| e.expect("checked trivial"))52					.collect(),53			)))54		}55		Expr::Parened(e) => evaluate_trivial(e)?,56		_ => return None,57	})58}5960pub fn evaluate_method(ctx: Context, name: IStr, params: ParamsDesc, body: LocExpr) -> Val {61	Val::Func(FuncVal::Normal(Cc::new(FuncDesc {62		name,63		ctx,64		params,65		body,66	})))67}6869pub fn evaluate_field_name(ctx: Context, field_name: &FieldName) -> Result<Option<IStr>> {70	Ok(match field_name {71		FieldName::Fixed(n) => Some(n.clone()),72		FieldName::Dyn(expr) => State::push(73			CallLocation::new(&expr.1),74			|| "evaluating field name".to_string(),75			|| {76				let value = evaluate(ctx, expr)?;77				if matches!(value, Val::Null) {78					Ok(None)79				} else {80					Ok(Some(IStr::from_untyped(value)?))81				}82			},83		)?,84	})85}8687pub fn evaluate_comp(88	ctx: Context,89	specs: &[CompSpec],90	callback: &mut impl FnMut(Context) -> Result<()>,91) -> Result<()> {92	match specs.get(0) {93		None => callback(ctx)?,94		Some(CompSpec::IfSpec(IfSpecData(cond))) => {95			if bool::from_untyped(evaluate(ctx.clone(), cond)?)? {96				evaluate_comp(ctx, &specs[1..], callback)?;97			}98		}99		Some(CompSpec::ForSpec(ForSpecData(var, expr))) => match evaluate(ctx.clone(), expr)? {100			Val::Arr(list) => {101				for item in list.iter_lazy() {102					let fctx = Pending::new();103					let mut new_bindings = GcHashMap::with_capacity(var.capacity_hint());104					destruct(var, item, fctx.clone(), &mut new_bindings)?;105					let ctx = ctx106						.clone()107						.extend(new_bindings, None, None, None)108						.into_future(fctx);109110					evaluate_comp(ctx, &specs[1..], callback)?;111				}112			}113			#[cfg(feature = "exp-object-iteration")]114			Val::Obj(obj) => {115				for field in obj.fields(116					// TODO: Should there be ability to preserve iteration order?117					#[cfg(feature = "exp-preserve-order")]118					false,119				) {120					#[derive(Trace)]121					struct ObjectFieldThunk {122						obj: ObjValue,123						field: IStr,124					}125					impl ThunkValue for ObjectFieldThunk {126						type Output = Val;127128						fn get(self: Box<Self>) -> Result<Self::Output> {129							self.obj.get(self.field).transpose().expect(130								"field exists, as field name was obtained from object.fields()",131							)132						}133					}134135					let fctx = Pending::new();136					let mut new_bindings = GcHashMap::with_capacity(var.capacity_hint());137					let value = Thunk::evaluated(Val::Arr(ArrValue::lazy(Cc::new(vec![138						Thunk::evaluated(Val::Str(StrValue::Flat(field.clone()))),139						Thunk::new(tb!(ObjectFieldThunk {140							field: field.clone(),141							obj: obj.clone(),142						})),143					]))));144					destruct(var, value, fctx.clone(), &mut new_bindings)?;145					let ctx = ctx146						.clone()147						.extend(new_bindings, None, None, None)148						.into_future(fctx);149150					evaluate_comp(ctx, &specs[1..], callback)?;151				}152			}153			_ => throw!(InComprehensionCanOnlyIterateOverArray),154		},155	}156	Ok(())157}158159trait CloneableUnbound<T>: Unbound<Bound = T> + Clone {}160impl<V, T> CloneableUnbound<T> for V where V: Unbound<Bound = T> + Clone {}161162fn evaluate_object_locals(163	fctx: Pending<Context>,164	locals: Rc<Vec<BindSpec>>,165) -> impl CloneableUnbound<Context> {166	#[derive(Trace, Clone)]167	struct UnboundLocals {168		fctx: Pending<Context>,169		locals: Rc<Vec<BindSpec>>,170	}171	impl Unbound for UnboundLocals {172		type Bound = Context;173174		fn bind(&self, sup: Option<ObjValue>, this: Option<ObjValue>) -> Result<Context> {175			let fctx = Context::new_future();176			let mut new_bindings =177				GcHashMap::with_capacity(self.locals.iter().map(BindSpec::capacity_hint).sum());178			for b in self.locals.iter() {179				evaluate_dest(b, fctx.clone(), &mut new_bindings)?;180			}181182			let ctx = self.fctx.unwrap();183			let new_dollar = ctx.dollar().clone().or_else(|| this.clone());184185			let ctx = ctx186				.extend(new_bindings, new_dollar, sup, this)187				.into_future(fctx);188189			Ok(ctx)190		}191	}192193	UnboundLocals { fctx, locals }194}195196pub fn evaluate_field_member<B: Unbound<Bound = Context> + Clone>(197	builder: &mut ObjValueBuilder,198	ctx: Context,199	uctx: B,200	field: &FieldMember,201) -> Result<()> {202	let name = evaluate_field_name(ctx, &field.name)?;203	let Some(name) = name else {204		return Ok(());205	};206207	match field {208		FieldMember {209			plus,210			params: None,211			visibility,212			value,213			..214		} => {215			#[derive(Trace)]216			struct UnboundValue<B: Trace> {217				uctx: B,218				value: LocExpr,219				name: IStr,220			}221			impl<B: Unbound<Bound = Context>> Unbound for UnboundValue<B> {222				type Bound = Val;223				fn bind(&self, sup: Option<ObjValue>, this: Option<ObjValue>) -> Result<Val> {224					evaluate_named(self.uctx.bind(sup, this)?, &self.value, self.name.clone())225				}226			}227228			builder229				.member(name.clone())230				.with_add(*plus)231				.with_visibility(*visibility)232				.with_location(value.1.clone())233				.bindable(tb!(UnboundValue {234					uctx,235					value: value.clone(),236					name,237				}))?;238		}239		FieldMember {240			params: Some(params),241			visibility,242			value,243			..244		} => {245			#[derive(Trace)]246			struct UnboundMethod<B: Trace> {247				uctx: B,248				value: LocExpr,249				params: ParamsDesc,250				name: IStr,251			}252			impl<B: Unbound<Bound = Context>> Unbound for UnboundMethod<B> {253				type Bound = Val;254				fn bind(&self, sup: Option<ObjValue>, this: Option<ObjValue>) -> Result<Val> {255					Ok(evaluate_method(256						self.uctx.bind(sup, this)?,257						self.name.clone(),258						self.params.clone(),259						self.value.clone(),260					))261				}262			}263264			builder265				.member(name.clone())266				.with_visibility(*visibility)267				.with_location(value.1.clone())268				.bindable(tb!(UnboundMethod {269					uctx,270					value: value.clone(),271					params: params.clone(),272					name,273				}))?;274		}275	}276	Ok(())277}278279#[allow(clippy::too_many_lines)]280pub fn evaluate_member_list_object(ctx: Context, members: &[Member]) -> Result<ObjValue> {281	let mut builder = ObjValueBuilder::new();282	let locals = Rc::new(283		members284			.iter()285			.filter_map(|m| match m {286				Member::BindStmt(bind) => Some(bind.clone()),287				_ => None,288			})289			.collect::<Vec<_>>(),290	);291292	let fctx = Context::new_future();293294	// We have single context for all fields, so we can cache binds295	let uctx = CachedUnbound::new(evaluate_object_locals(fctx.clone(), locals));296297	for member in members.iter() {298		match member {299			Member::Field(field) => {300				evaluate_field_member(&mut builder, ctx.clone(), uctx.clone(), field)?;301			}302			Member::AssertStmt(stmt) => {303				#[derive(Trace)]304				struct ObjectAssert<B: Trace> {305					uctx: B,306					assert: AssertStmt,307				}308				impl<B: Unbound<Bound = Context>> ObjectAssertion for ObjectAssert<B> {309					fn run(&self, sup: Option<ObjValue>, this: Option<ObjValue>) -> Result<()> {310						let ctx = self.uctx.bind(sup, this)?;311						evaluate_assert(ctx, &self.assert)312					}313				}314				builder.assert(tb!(ObjectAssert {315					uctx: uctx.clone(),316					assert: stmt.clone(),317				}));318			}319			Member::BindStmt(_) => {320				// Already handled321			}322		}323	}324	let this = builder.build();325	fctx.fill(ctx.extend(GcHashMap::new(), None, None, Some(this.clone())));326	Ok(this)327}328329pub fn evaluate_object(ctx: Context, object: &ObjBody) -> Result<ObjValue> {330	Ok(match object {331		ObjBody::MemberList(members) => evaluate_member_list_object(ctx, members)?,332		ObjBody::ObjComp(obj) => {333			let mut builder = ObjValueBuilder::new();334			let locals = Rc::new(335				obj.pre_locals336					.iter()337					.chain(obj.post_locals.iter())338					.cloned()339					.collect::<Vec<_>>(),340			);341			let mut ctxs = vec![];342			evaluate_comp(ctx, &obj.compspecs, &mut |ctx| {343				let fctx = Context::new_future();344				ctxs.push((ctx.clone(), fctx.clone()));345				let uctx = evaluate_object_locals(fctx, locals.clone());346347				evaluate_field_member(&mut builder, ctx, uctx, &obj.field)348			})?;349350			let this = builder.build();351			for (ctx, fctx) in ctxs {352				let _ctx = ctx353					.extend(GcHashMap::new(), None, None, Some(this.clone()))354					.into_future(fctx);355			}356			this357		}358	})359}360361pub fn evaluate_apply(362	ctx: Context,363	value: &LocExpr,364	args: &ArgsDesc,365	loc: CallLocation<'_>,366	tailstrict: bool,367) -> Result<Val> {368	let value = evaluate(ctx.clone(), value)?;369	Ok(match value {370		Val::Func(f) => {371			let body = || f.evaluate(ctx, loc, args, tailstrict);372			if tailstrict {373				body()?374			} else {375				State::push(loc, || format!("function <{}> call", f.name()), body)?376			}377		}378		v => throw!(OnlyFunctionsCanBeCalledGot(v.value_type())),379	})380}381382pub fn evaluate_assert(ctx: Context, assertion: &AssertStmt) -> Result<()> {383	let value = &assertion.0;384	let msg = &assertion.1;385	let assertion_result = State::push(386		CallLocation::new(&value.1),387		|| "assertion condition".to_owned(),388		|| bool::from_untyped(evaluate(ctx.clone(), value)?),389	)?;390	if !assertion_result {391		State::push(392			CallLocation::new(&value.1),393			|| "assertion failure".to_owned(),394			|| {395				if let Some(msg) = msg {396					throw!(AssertionFailed(evaluate(ctx, msg)?.to_string()?));397				}398				throw!(AssertionFailed(Val::Null.to_string()?));399			},400		)?;401	}402	Ok(())403}404405pub fn evaluate_named(ctx: Context, expr: &LocExpr, name: IStr) -> Result<Val> {406	use Expr::*;407	let LocExpr(raw_expr, _loc) = expr;408	Ok(match &**raw_expr {409		Function(params, body) => evaluate_method(ctx, name, params.clone(), body.clone()),410		_ => evaluate(ctx, expr)?,411	})412}413414#[allow(clippy::too_many_lines)]415pub fn evaluate(ctx: Context, expr: &LocExpr) -> Result<Val> {416	use Expr::*;417	if let Some(trivial) = evaluate_trivial(expr) {418		return Ok(trivial);419	}420	let LocExpr(expr, loc) = expr;421	Ok(match &**expr {422		Literal(LiteralType::This) => {423			Val::Obj(ctx.this().clone().ok_or(CantUseSelfOutsideOfObject)?)424		}425		Literal(LiteralType::Super) => Val::Obj(426			ctx.super_obj().clone().ok_or(NoSuperFound)?.with_this(427				ctx.this()428					.clone()429					.expect("if super exists - then this should too"),430			),431		),432		Literal(LiteralType::Dollar) => {433			Val::Obj(ctx.dollar().clone().ok_or(NoTopLevelObjectFound)?)434		}435		Literal(LiteralType::True) => Val::Bool(true),436		Literal(LiteralType::False) => Val::Bool(false),437		Literal(LiteralType::Null) => Val::Null,438		Parened(e) => evaluate(ctx, e)?,439		Str(v) => Val::Str(StrValue::Flat(v.clone())),440		Num(v) => Val::new_checked_num(*v)?,441		BinaryOp(v1, o, v2) => evaluate_binary_op_special(ctx, v1, *o, v2)?,442		UnaryOp(o, v) => evaluate_unary_op(*o, &evaluate(ctx, v)?)?,443		Var(name) => State::push(444			CallLocation::new(loc),445			|| format!("variable <{name}> access"),446			|| ctx.binding(name.clone())?.evaluate(),447		)?,448		Index(LocExpr(v, _), index) if matches!(&**v, Expr::Literal(LiteralType::Super)) => {449			let name = evaluate(ctx.clone(), index)?;450			let Val::Str(name) = name else {451				throw!(ValueIndexMustBeTypeGot(452					ValType::Obj,453					ValType::Str,454					name.value_type(),455				))456			};457			ctx.super_obj()458				.clone()459				.expect("no super found")460				.get_for(name.into_flat(), ctx.this().clone().expect("no this found"))?461				.expect("value not found")462		}463		Index(value, index) => match (evaluate(ctx.clone(), value)?, evaluate(ctx, index)?) {464			(Val::Obj(v), Val::Str(key)) => State::push(465				CallLocation::new(loc),466				|| format!("field <{key}> access"),467				|| match v.get(key.clone().into_flat()) {468					Ok(Some(v)) => Ok(v),469					#[cfg(not(feature = "friendly-errors"))]470					Ok(None) => throw!(NoSuchField(key.clone(), vec![])),471					#[cfg(feature = "friendly-errors")]472					Ok(None) => {473						let mut heap = Vec::new();474						for field in v.fields_ex(475							true,476							#[cfg(feature = "exp-preserve-order")]477							false,478						) {479							let conf = strsim::jaro_winkler(480								&field as &str,481								&key.clone().into_flat() as &str,482							);483							if conf < 0.8 {484								continue;485							}486							heap.push((conf, field));487						}488						heap.sort_by(|a, b| b.0.partial_cmp(&a.0).unwrap_or(Ordering::Equal));489490						throw!(NoSuchField(491							key.clone().into_flat(),492							heap.into_iter().map(|(_, v)| v).collect()493						))494					}495					Err(e) => Err(e),496				},497			)?,498			(Val::Obj(_), n) => throw!(ValueIndexMustBeTypeGot(499				ValType::Obj,500				ValType::Str,501				n.value_type(),502			)),503504			(Val::Arr(v), Val::Num(n)) => {505				if n.fract() > f64::EPSILON {506					throw!(FractionalIndex)507				}508				v.get(n as usize)?509					.ok_or_else(|| ArrayBoundsError(n as usize, v.len()))?510			}511			(Val::Arr(_), Val::Str(n)) => throw!(AttemptedIndexAnArrayWithString(n.into_flat())),512			(Val::Arr(_), n) => throw!(ValueIndexMustBeTypeGot(513				ValType::Arr,514				ValType::Num,515				n.value_type(),516			)),517518			(Val::Str(s), Val::Num(n)) => Val::Str({519				let v: IStr = s520					.clone()521					.into_flat()522					.chars()523					.skip(n as usize)524					.take(1)525					.collect::<String>()526					.into();527				if v.is_empty() {528					let size = s.into_flat().chars().count();529					throw!(StringBoundsError(n as usize, size))530				}531				StrValue::Flat(v)532			}),533			(Val::Str(_), n) => throw!(ValueIndexMustBeTypeGot(534				ValType::Str,535				ValType::Num,536				n.value_type(),537			)),538539			(v, _) => throw!(CantIndexInto(v.value_type())),540		},541		LocalExpr(bindings, returned) => {542			let mut new_bindings: GcHashMap<IStr, Thunk<Val>> =543				GcHashMap::with_capacity(bindings.iter().map(BindSpec::capacity_hint).sum());544			let fctx = Context::new_future();545			for b in bindings {546				evaluate_dest(b, fctx.clone(), &mut new_bindings)?;547			}548			let ctx = ctx.extend(new_bindings, None, None, None).into_future(fctx);549			evaluate(ctx, &returned.clone())?550		}551		Arr(items) => {552			if items.is_empty() {553				Val::Arr(ArrValue::empty())554			} else if items.len() == 1 {555				#[derive(Trace)]556				struct ArrayElement {557					ctx: Context,558					item: LocExpr,559				}560				impl ThunkValue for ArrayElement {561					type Output = Val;562					fn get(self: Box<Self>) -> Result<Val> {563						evaluate(self.ctx, &self.item)564					}565				}566				Val::Arr(ArrValue::lazy(Cc::new(vec![Thunk::new(tb!(567					ArrayElement {568						ctx,569						item: items[0].clone(),570					}571				))])))572			} else {573				Val::Arr(ArrValue::expr(ctx, items.iter().cloned()))574			}575		}576		ArrComp(expr, comp_specs) => {577			let mut out = Vec::new();578			evaluate_comp(ctx, comp_specs, &mut |ctx| {579				out.push(evaluate(ctx, expr)?);580				Ok(())581			})?;582			Val::Arr(ArrValue::eager(Cc::new(out)))583		}584		Obj(body) => Val::Obj(evaluate_object(ctx, body)?),585		ObjExtend(a, b) => evaluate_add_op(586			&evaluate(ctx.clone(), a)?,587			&Val::Obj(evaluate_object(ctx, b)?),588		)?,589		Apply(value, args, tailstrict) => {590			evaluate_apply(ctx, value, args, CallLocation::new(loc), *tailstrict)?591		}592		Function(params, body) => {593			evaluate_method(ctx, "anonymous".into(), params.clone(), body.clone())594		}595		AssertExpr(assert, returned) => {596			evaluate_assert(ctx.clone(), assert)?;597			evaluate(ctx, returned)?598		}599		ErrorStmt(e) => State::push(600			CallLocation::new(loc),601			|| "error statement".to_owned(),602			|| throw!(RuntimeError(evaluate(ctx, e)?.to_string()?,)),603		)?,604		IfElse {605			cond,606			cond_then,607			cond_else,608		} => {609			if State::push(610				CallLocation::new(loc),611				|| "if condition".to_owned(),612				|| bool::from_untyped(evaluate(ctx.clone(), &cond.0)?),613			)? {614				evaluate(ctx, cond_then)?615			} else {616				match cond_else {617					Some(v) => evaluate(ctx, v)?,618					None => Val::Null,619				}620			}621		}622		Slice(value, desc) => {623			fn parse_idx<T: Typed>(624				loc: CallLocation<'_>,625				ctx: &Context,626				expr: &Option<LocExpr>,627				desc: &'static str,628			) -> Result<Option<T>> {629				if let Some(value) = expr {630					Ok(Some(State::push(631						loc,632						|| format!("slice {desc}"),633						|| T::from_untyped(evaluate(ctx.clone(), value)?),634					)?))635				} else {636					Ok(None)637				}638			}639640			let indexable = evaluate(ctx.clone(), value)?;641			let loc = CallLocation::new(loc);642643			let start = parse_idx(loc, &ctx, &desc.start, "start")?;644			let end = parse_idx(loc, &ctx, &desc.end, "end")?;645			let step = parse_idx(loc, &ctx, &desc.step, "step")?;646647			IndexableVal::into_untyped(indexable.into_indexable()?.slice(start, end, step)?)?648		}649		i @ (Import(path) | ImportStr(path) | ImportBin(path)) => {650			let Expr::Str(path) = &*path.0 else {651				throw!("computed imports are not supported")652			};653			let tmp = loc.clone().0;654			let s = ctx.state();655			let resolved_path = s.resolve_from(tmp.source_path(), path as &str)?;656			match i {657				Import(_) => State::push(658					CallLocation::new(loc),659					|| format!("import {:?}", path.clone()),660					|| s.import_resolved(resolved_path),661				)?,662				ImportStr(_) => Val::Str(StrValue::Flat(s.import_resolved_str(resolved_path)?)),663				ImportBin(_) => Val::Arr(ArrValue::bytes(s.import_resolved_bin(resolved_path)?)),664				_ => unreachable!(),665			}666		}667	})668}