git.delta.rocks / jrsonnet / refs/commits / 6d535da7fe1f

1use crate::{2	builtin::{3		call_builtin,4		manifest::{manifest_json_ex, ManifestJsonOptions, ManifestType},5	},6	error::{Error::*, LocError},7	evaluate,8	function::{parse_function_call, parse_function_call_map, place_args},9	native::NativeCallback,10	throw, with_state, Context, ObjValue, Result,11};12use jrsonnet_gc::{Gc, GcCell, Trace};13use jrsonnet_interner::IStr;14use jrsonnet_parser::{el, Arg, ArgsDesc, Expr, ExprLocation, LiteralType, LocExpr, ParamsDesc};15use jrsonnet_types::ValType;16use std::{collections::HashMap, fmt::Debug, rc::Rc};1718pub trait LazyValValue: Trace {19	fn get(self: Box<Self>) -> Result<Val>;20}2122#[derive(Trace)]23#[trivially_drop]24enum LazyValInternals {25	Computed(Val),26	Errored(LocError),27	Waiting(Box<dyn LazyValValue>),28	Pending,29}3031#[derive(Clone, Trace)]32#[trivially_drop]33pub struct LazyVal(Gc<GcCell<LazyValInternals>>);34impl LazyVal {35	pub fn new(f: Box<dyn LazyValValue>) -> Self {36		Self(Gc::new(GcCell::new(LazyValInternals::Waiting(f))))37	}38	pub fn new_resolved(val: Val) -> Self {39		Self(Gc::new(GcCell::new(LazyValInternals::Computed(val))))40	}41	pub fn evaluate(&self) -> Result<Val> {42		match &*self.0.borrow() {43			LazyValInternals::Computed(v) => return Ok(v.clone()),44			LazyValInternals::Errored(e) => return Err(e.clone()),45			LazyValInternals::Pending => return Err(RecursiveLazyValueEvaluation.into()),46			_ => (),47		};48		let value = if let LazyValInternals::Waiting(value) =49			std::mem::replace(&mut *self.0.borrow_mut(), LazyValInternals::Pending)50		{51			value52		} else {53			unreachable!()54		};55		let new_value = match value.get() {56			Ok(v) => v,57			Err(e) => {58				*self.0.borrow_mut() = LazyValInternals::Errored(e.clone());59				return Err(e);60			}61		};62		*self.0.borrow_mut() = LazyValInternals::Computed(new_value.clone());63		Ok(new_value)64	}65}6667impl Debug for LazyVal {68	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {69		write!(f, "Lazy")70	}71}72impl PartialEq for LazyVal {73	fn eq(&self, other: &Self) -> bool {74		Gc::ptr_eq(&self.0, &other.0)75	}76}7778#[derive(Debug, PartialEq, Trace)]79#[trivially_drop]80pub struct FuncDesc {81	pub name: IStr,82	pub ctx: Context,83	pub params: ParamsDesc,84	pub body: LocExpr,85}8687#[derive(Debug, Trace)]88#[trivially_drop]89pub enum FuncVal {90	/// Plain function implemented in jsonnet91	Normal(FuncDesc),92	/// Standard library function93	Intrinsic(IStr),94	/// Library functions implemented in native95	NativeExt(IStr, Gc<NativeCallback>),96}9798impl PartialEq for FuncVal {99	fn eq(&self, other: &Self) -> bool {100		match (self, other) {101			(Self::Normal(a), Self::Normal(b)) => a == b,102			(Self::Intrinsic(an), Self::Intrinsic(bn)) => an == bn,103			(Self::NativeExt(an, _), Self::NativeExt(bn, _)) => an == bn,104			(..) => false,105		}106	}107}108impl FuncVal {109	pub fn is_ident(&self) -> bool {110		matches!(&self, Self::Intrinsic(n) if n as &str == "id")111	}112	pub fn name(&self) -> IStr {113		match self {114			Self::Normal(normal) => normal.name.clone(),115			Self::Intrinsic(name) => format!("std.{}", name).into(),116			Self::NativeExt(n, _) => format!("native.{}", n).into(),117		}118	}119	pub fn evaluate(120		&self,121		call_ctx: Context,122		loc: Option<&ExprLocation>,123		args: &ArgsDesc,124		tailstrict: bool,125	) -> Result<Val> {126		match self {127			Self::Normal(func) => {128				let ctx = parse_function_call(129					call_ctx,130					Some(func.ctx.clone()),131					&func.params,132					args,133					tailstrict,134				)?;135				evaluate(ctx, &func.body)136			}137			Self::Intrinsic(name) => call_builtin(call_ctx, loc, name, args),138			Self::NativeExt(_name, handler) => {139				let args = parse_function_call(call_ctx, None, &handler.params, args, true)?;140				let mut out_args = Vec::with_capacity(handler.params.len());141				for p in handler.params.0.iter() {142					out_args.push(args.binding(p.0.clone())?.evaluate()?);143				}144				Ok(handler.call(loc.map(|l| l.0.clone()), &out_args)?)145			}146		}147	}148149	pub fn evaluate_map(150		&self,151		call_ctx: Context,152		args: &HashMap<IStr, Val>,153		tailstrict: bool,154	) -> Result<Val> {155		match self {156			Self::Normal(func) => {157				let ctx = parse_function_call_map(158					call_ctx,159					Some(func.ctx.clone()),160					&func.params,161					args,162					tailstrict,163				)?;164				evaluate(ctx, &func.body)165			}166			Self::Intrinsic(_) => todo!(),167			Self::NativeExt(_, _) => todo!(),168		}169	}170171	pub fn evaluate_values(&self, call_ctx: Context, args: &[Val]) -> Result<Val> {172		match self {173			Self::Normal(func) => {174				let ctx = place_args(call_ctx, Some(func.ctx.clone()), &func.params, args)?;175				evaluate(ctx, &func.body)176			}177			Self::Intrinsic(_) => todo!(),178			Self::NativeExt(_, _) => todo!(),179		}180	}181}182183#[derive(Clone)]184pub enum ManifestFormat {185	YamlStream(Box<ManifestFormat>),186	Yaml(usize),187	Json(usize),188	ToString,189	String,190}191192#[derive(Debug, Clone, Trace)]193#[trivially_drop]194pub enum ArrValue {195	Lazy(Gc<Vec<LazyVal>>),196	Eager(Gc<Vec<Val>>),197	Extended(Box<(Self, Self)>),198}199impl ArrValue {200	pub fn new_eager() -> Self {201		Self::Eager(Gc::new(Vec::new()))202	}203204	pub fn len(&self) -> usize {205		match self {206			Self::Lazy(l) => l.len(),207			Self::Eager(e) => e.len(),208			Self::Extended(v) => v.0.len() + v.1.len(),209		}210	}211212	pub fn is_empty(&self) -> bool {213		self.len() == 0214	}215216	pub fn get(&self, index: usize) -> Result<Option<Val>> {217		match self {218			Self::Lazy(vec) => {219				if let Some(v) = vec.get(index) {220					Ok(Some(v.evaluate()?))221				} else {222					Ok(None)223				}224			}225			Self::Eager(vec) => Ok(vec.get(index).cloned()),226			Self::Extended(v) => {227				let a_len = v.0.len();228				if a_len > index {229					v.0.get(index)230				} else {231					v.1.get(index - a_len)232				}233			}234		}235	}236237	pub fn get_lazy(&self, index: usize) -> Option<LazyVal> {238		match self {239			Self::Lazy(vec) => vec.get(index).cloned(),240			Self::Eager(vec) => vec.get(index).cloned().map(LazyVal::new_resolved),241			Self::Extended(v) => {242				let a_len = v.0.len();243				if a_len > index {244					v.0.get_lazy(index)245				} else {246					v.1.get_lazy(index - a_len)247				}248			}249		}250	}251252	pub fn evaluated(&self) -> Result<Gc<Vec<Val>>> {253		Ok(match self {254			Self::Lazy(vec) => {255				let mut out = Vec::with_capacity(vec.len());256				for item in vec.iter() {257					out.push(item.evaluate()?);258				}259				Gc::new(out)260			}261			Self::Eager(vec) => vec.clone(),262			Self::Extended(_v) => {263				let mut out = Vec::with_capacity(self.len());264				for item in self.iter() {265					out.push(item?);266				}267				Gc::new(out)268			}269		})270	}271272	pub fn iter(&self) -> impl DoubleEndedIterator<Item = Result<Val>> + '_ {273		(0..self.len()).map(move |idx| match self {274			Self::Lazy(l) => l[idx].evaluate(),275			Self::Eager(e) => Ok(e[idx].clone()),276			Self::Extended(_) => self.get(idx).map(|e| e.unwrap()),277		})278	}279280	pub fn iter_lazy(&self) -> impl DoubleEndedIterator<Item = LazyVal> + '_ {281		(0..self.len()).map(move |idx| match self {282			Self::Lazy(l) => l[idx].clone(),283			Self::Eager(e) => LazyVal::new_resolved(e[idx].clone()),284			Self::Extended(_) => self.get_lazy(idx).unwrap(),285		})286	}287288	pub fn reversed(self) -> Self {289		match self {290			Self::Lazy(vec) => {291				let mut out = (&vec as &Vec<_>).clone();292				out.reverse();293				Self::Lazy(Gc::new(out))294			}295			Self::Eager(vec) => {296				let mut out = (&vec as &Vec<_>).clone();297				out.reverse();298				Self::Eager(Gc::new(out))299			}300			Self::Extended(b) => Self::Extended(Box::new((b.1.reversed(), b.0.reversed()))),301		}302	}303304	pub fn map(self, mapper: impl Fn(Val) -> Result<Val>) -> Result<Self> {305		let mut out = Vec::with_capacity(self.len());306307		for value in self.iter() {308			out.push(mapper(value?)?);309		}310311		Ok(Self::Eager(Gc::new(out)))312	}313314	pub fn filter(self, filter: impl Fn(&Val) -> Result<bool>) -> Result<Self> {315		let mut out = Vec::with_capacity(self.len());316317		for value in self.iter() {318			let value = value?;319			if filter(&value)? {320				out.push(value);321			}322		}323324		Ok(Self::Eager(Gc::new(out)))325	}326327	pub fn ptr_eq(a: &Self, b: &Self) -> bool {328		match (a, b) {329			(Self::Lazy(a), Self::Lazy(b)) => Gc::ptr_eq(a, b),330			(Self::Eager(a), Self::Eager(b)) => Gc::ptr_eq(a, b),331			_ => false,332		}333	}334}335336impl From<Vec<LazyVal>> for ArrValue {337	fn from(v: Vec<LazyVal>) -> Self {338		Self::Lazy(Gc::new(v))339	}340}341342impl From<Vec<Val>> for ArrValue {343	fn from(v: Vec<Val>) -> Self {344		Self::Eager(Gc::new(v))345	}346}347348pub enum IndexableVal {349	Str(IStr),350	Arr(ArrValue),351}352353#[derive(Debug, Clone, Trace)]354#[trivially_drop]355pub enum Val {356	Bool(bool),357	Null,358	Str(IStr),359	Num(f64),360	Arr(ArrValue),361	Obj(ObjValue),362	Func(Gc<FuncVal>),363}364365macro_rules! matches_unwrap {366	($e: expr, $p: pat, $r: expr) => {367		match $e {368			$p => $r,369			_ => panic!("no match"),370		}371	};372}373impl Val {374	/// Creates `Val::Num` after checking for numeric overflow.375	/// As numbers are `f64`, we can just check for their finity.376	pub fn new_checked_num(num: f64) -> Result<Self> {377		if num.is_finite() {378			Ok(Self::Num(num))379		} else {380			throw!(RuntimeError("overflow".into()))381		}382	}383384	pub fn assert_type(&self, context: &'static str, val_type: ValType) -> Result<()> {385		let this_type = self.value_type();386		if this_type != val_type {387			throw!(TypeMismatch(context, vec![val_type], this_type))388		} else {389			Ok(())390		}391	}392	pub fn unwrap_num(self) -> Result<f64> {393		Ok(matches_unwrap!(self, Self::Num(v), v))394	}395	pub fn unwrap_func(self) -> Result<Gc<FuncVal>> {396		Ok(matches_unwrap!(self, Self::Func(v), v))397	}398	pub fn try_cast_bool(self, context: &'static str) -> Result<bool> {399		self.assert_type(context, ValType::Bool)?;400		Ok(matches_unwrap!(self, Self::Bool(v), v))401	}402	pub fn try_cast_str(self, context: &'static str) -> Result<IStr> {403		self.assert_type(context, ValType::Str)?;404		Ok(matches_unwrap!(self, Self::Str(v), v))405	}406	pub fn try_cast_num(self, context: &'static str) -> Result<f64> {407		self.assert_type(context, ValType::Num)?;408		self.unwrap_num()409	}410	pub fn try_cast_nullable_num(self, context: &'static str) -> Result<Option<f64>> {411		Ok(match self {412			Val::Null => None,413			Val::Num(num) => Some(num),414			_ => throw!(TypeMismatch(415				context,416				vec![ValType::Null, ValType::Num],417				self.value_type()418			)),419		})420	}421	pub const fn value_type(&self) -> ValType {422		match self {423			Self::Str(..) => ValType::Str,424			Self::Num(..) => ValType::Num,425			Self::Arr(..) => ValType::Arr,426			Self::Obj(..) => ValType::Obj,427			Self::Bool(_) => ValType::Bool,428			Self::Null => ValType::Null,429			Self::Func(..) => ValType::Func,430		}431	}432433	pub fn to_string(&self) -> Result<IStr> {434		Ok(match self {435			Self::Bool(true) => "true".into(),436			Self::Bool(false) => "false".into(),437			Self::Null => "null".into(),438			Self::Str(s) => s.clone(),439			v => manifest_json_ex(440				v,441				&ManifestJsonOptions {442					padding: "",443					mtype: ManifestType::ToString,444				},445			)?446			.into(),447		})448	}449450	/// Expects value to be object, outputs (key, manifested value) pairs451	pub fn manifest_multi(&self, ty: &ManifestFormat) -> Result<Vec<(IStr, IStr)>> {452		let obj = match self {453			Self::Obj(obj) => obj,454			_ => throw!(MultiManifestOutputIsNotAObject),455		};456		let keys = obj.fields();457		let mut out = Vec::with_capacity(keys.len());458		for key in keys {459			let value = obj460				.get(key.clone())?461				.expect("item in object")462				.manifest(ty)?;463			out.push((key, value));464		}465		Ok(out)466	}467468	/// Expects value to be array, outputs manifested values469	pub fn manifest_stream(&self, ty: &ManifestFormat) -> Result<Vec<IStr>> {470		let arr = match self {471			Self::Arr(a) => a,472			_ => throw!(StreamManifestOutputIsNotAArray),473		};474		let mut out = Vec::with_capacity(arr.len());475		for i in arr.iter() {476			out.push(i?.manifest(ty)?);477		}478		Ok(out)479	}480481	pub fn manifest(&self, ty: &ManifestFormat) -> Result<IStr> {482		Ok(match ty {483			ManifestFormat::YamlStream(format) => {484				let arr = match self {485					Self::Arr(a) => a,486					_ => throw!(StreamManifestOutputIsNotAArray),487				};488				let mut out = String::new();489490				match format as &ManifestFormat {491					ManifestFormat::YamlStream(_) => throw!(StreamManifestOutputCannotBeRecursed),492					ManifestFormat::String => throw!(StreamManifestCannotNestString),493					_ => {}494				};495496				if !arr.is_empty() {497					for v in arr.iter() {498						out.push_str("---\n");499						out.push_str(&v?.manifest(format)?);500						out.push('\n');501					}502					out.push_str("...");503				}504505				out.into()506			}507			ManifestFormat::Yaml(padding) => self.to_yaml(*padding)?,508			ManifestFormat::Json(padding) => self.to_json(*padding)?,509			ManifestFormat::ToString => self.to_string()?,510			ManifestFormat::String => match self {511				Self::Str(s) => s.clone(),512				_ => throw!(StringManifestOutputIsNotAString),513			},514		})515	}516517	/// For manifestification518	pub fn to_json(&self, padding: usize) -> Result<IStr> {519		manifest_json_ex(520			self,521			&ManifestJsonOptions {522				padding: &" ".repeat(padding),523				mtype: if padding == 0 {524					ManifestType::Minify525				} else {526					ManifestType::Manifest527				},528			},529		)530		.map(|s| s.into())531	}532533	/// Calls `std.manifestJson`534	pub fn to_std_json(&self, padding: usize) -> Result<Rc<str>> {535		manifest_json_ex(536			self,537			&ManifestJsonOptions {538				padding: &" ".repeat(padding),539				mtype: ManifestType::Std,540			},541		)542		.map(|s| s.into())543	}544545	pub fn to_yaml(&self, padding: usize) -> Result<IStr> {546		with_state(|s| {547			let ctx = s548				.create_default_context()549				.with_var("__tmp__to_json__".into(), self.clone());550			evaluate(551				ctx,552				&el!(Expr::Apply(553					el!(Expr::Index(554						el!(Expr::Var("std".into())),555						el!(Expr::Str("manifestYamlDoc".into()))556					)),557					ArgsDesc(vec![558						Arg(None, el!(Expr::Var("__tmp__to_json__".into()))),559						Arg(560							None,561							el!(Expr::Literal(if padding != 0 {562								LiteralType::True563							} else {564								LiteralType::False565							}))566						)567					]),568					false569				)),570			)?571			.try_cast_str("to json")572		})573	}574	pub fn into_indexable(self) -> Result<IndexableVal> {575		Ok(match self {576			Val::Str(s) => IndexableVal::Str(s),577			Val::Arr(arr) => IndexableVal::Arr(arr),578			_ => throw!(ValueIsNotIndexable(self.value_type())),579		})580	}581}582583const fn is_function_like(val: &Val) -> bool {584	matches!(val, Val::Func(_))585}586587/// Native implementation of `std.primitiveEquals`588pub fn primitive_equals(val_a: &Val, val_b: &Val) -> Result<bool> {589	Ok(match (val_a, val_b) {590		(Val::Bool(a), Val::Bool(b)) => a == b,591		(Val::Null, Val::Null) => true,592		(Val::Str(a), Val::Str(b)) => a == b,593		(Val::Num(a), Val::Num(b)) => (a - b).abs() <= f64::EPSILON,594		(Val::Arr(_), Val::Arr(_)) => throw!(RuntimeError(595			"primitiveEquals operates on primitive types, got array".into(),596		)),597		(Val::Obj(_), Val::Obj(_)) => throw!(RuntimeError(598			"primitiveEquals operates on primitive types, got object".into(),599		)),600		(a, b) if is_function_like(a) && is_function_like(b) => {601			throw!(RuntimeError("cannot test equality of functions".into()))602		}603		(_, _) => false,604	})605}606607/// Native implementation of `std.equals`608pub fn equals(val_a: &Val, val_b: &Val) -> Result<bool> {609	if val_a.value_type() != val_b.value_type() {610		return Ok(false);611	}612	match (val_a, val_b) {613		(Val::Arr(a), Val::Arr(b)) => {614			if ArrValue::ptr_eq(a, b) {615				return Ok(true);616			}617			if a.len() != b.len() {618				return Ok(false);619			}620			for (a, b) in a.iter().zip(b.iter()) {621				if !equals(&a?, &b?)? {622					return Ok(false);623				}624			}625			Ok(true)626		}627		(Val::Obj(a), Val::Obj(b)) => {628			if ObjValue::ptr_eq(a, b) {629				return Ok(true);630			}631			let fields = a.fields();632			if fields != b.fields() {633				return Ok(false);634			}635			for field in fields {636				if !equals(&a.get(field.clone())?.unwrap(), &b.get(field)?.unwrap())? {637					return Ok(false);638				}639			}640			Ok(true)641		}642		(a, b) => Ok(primitive_equals(a, b)?),643	}644}