`0dad2a64ea4b`

1 file changed

modifiedcrates/jrsonnet-evaluator/src/val.rsdiff before after both

1use crate::{2	create_error_result, evaluate,3	function::{parse_function_call, place_args},4	Context, Error, ObjValue, Result,5};6use jrsonnet_parser::{ArgsDesc, LocExpr, ParamsDesc};7use std::{8	cell::RefCell,9	fmt::{Debug, Display},10	rc::Rc,11};1213enum LazyValInternals {14	Computed(Val),15	Waiting(Box<dyn Fn() -> Result<Val>>),16}17#[derive(Clone)]18pub struct LazyVal(Rc<RefCell<LazyValInternals>>);19impl LazyVal {20	pub fn new(f: Box<dyn Fn() -> Result<Val>>) -> Self {21		LazyVal(Rc::new(RefCell::new(LazyValInternals::Waiting(f))))22	}23	pub fn new_resolved(val: Val) -> Self {24		LazyVal(Rc::new(RefCell::new(LazyValInternals::Computed(val))))25	}26	pub fn evaluate(&self) -> Result<Val> {27		let new_value = match &*self.0.borrow() {28			LazyValInternals::Computed(v) => return Ok(v.clone()),29			LazyValInternals::Waiting(f) => f()?,30		};31		*self.0.borrow_mut() = LazyValInternals::Computed(new_value.clone());32		Ok(new_value)33	}34}3536#[macro_export]37macro_rules! lazy_val {38	($f: expr) => {39		$crate::LazyVal::new(Box::new($f))40	};41}42#[macro_export]43macro_rules! resolved_lazy_val {44	($f: expr) => {45		$crate::LazyVal::new_resolved($f)46	};47}48impl Debug for LazyVal {49	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {50		write!(f, "Lazy")51	}52}53impl PartialEq for LazyVal {54	fn eq(&self, other: &Self) -> bool {55		Rc::ptr_eq(&self.0, &other.0)56	}57}5859#[derive(Debug, PartialEq)]60pub struct FuncDesc {61	pub ctx: Context,62	pub params: ParamsDesc,63	pub body: LocExpr,64}65impl FuncDesc {66	/// This function is always inlined to make tailstrict work67	pub fn evaluate(&self, call_ctx: Context, args: &ArgsDesc, tailstrict: bool) -> Result<Val> {68		let ctx = parse_function_call(69			call_ctx,70			Some(self.ctx.clone()),71			&self.params,72			args,73			tailstrict,74		)?;75		evaluate(ctx, &self.body)76	}7778	pub fn evaluate_values(&self, call_ctx: Context, args: &[Val]) -> Result<Val> {79		let ctx = place_args(call_ctx, Some(self.ctx.clone()), &self.params, args)?;80		evaluate(ctx, &self.body)81	}82}8384#[derive(Debug, Clone, Copy, PartialEq)]85pub enum ValType {86	Bool,87	Null,88	Str,89	Num,90	Arr,91	Obj,92	Func,93}94impl ValType {95	pub fn name(&self) -> &'static str {96		use ValType::*;97		match self {98			Bool => "boolean",99			Null => "null",100			Str => "string",101			Num => "number",102			Arr => "array",103			Obj => "object",104			Func => "function",105		}106	}107}108impl Display for ValType {109	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {110		write!(f, "{}", self.name())111	}112}113114#[derive(Debug, Clone)]115pub enum Val {116	Bool(bool),117	Null,118	Str(Rc<str>),119	Num(f64),120	Lazy(LazyVal),121	Arr(Rc<Vec<Val>>),122	Obj(ObjValue),123	Func(Rc<FuncDesc>),124125	// Library functions implemented in native126	Intristic(Rc<str>, Rc<str>),127}128macro_rules! matches_unwrap {129	($e: expr, $p: pat, $r: expr) => {130		match $e {131			$p => $r,132			_ => panic!("no match"),133			}134	};135}136impl Val {137	/// Creates Val::Num after checking for overflow. As numbers are f64, we can just check for finity138	pub fn new_checked_num(num: f64) -> Result<Val> {139		if num.is_finite() {140			Ok(Val::Num(num))141		} else {142			create_error_result(Error::RuntimeError("overflow".into()))143		}144	}145146	pub fn assert_type(&self, context: &'static str, val_type: ValType) -> Result<()> {147		let this_type = self.value_type()?;148		if this_type != val_type {149			create_error_result(Error::TypeMismatch(context, vec![val_type], this_type))150		} else {151			Ok(())152		}153	}154	pub fn try_cast_bool(self, context: &'static str) -> Result<bool> {155		self.assert_type(context, ValType::Bool)?;156		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Bool(v), v))157	}158	pub fn try_cast_str(self, context: &'static str) -> Result<Rc<str>> {159		self.assert_type(context, ValType::Str)?;160		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Str(v), v))161	}162	pub fn try_cast_num(self, context: &'static str) -> Result<f64> {163		self.assert_type(context, ValType::Num)?;164		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Num(v), v))165	}166	pub fn unwrap_if_lazy(&self) -> Result<Self> {167		Ok(if let Val::Lazy(v) = self {168			v.evaluate()?.unwrap_if_lazy()?169		} else {170			self.clone()171		})172	}173	pub fn value_type(&self) -> Result<ValType> {174		Ok(match self {175			Val::Str(..) => ValType::Str,176			Val::Num(..) => ValType::Num,177			Val::Arr(..) => ValType::Arr,178			Val::Obj(..) => ValType::Obj,179			Val::Func(..) => ValType::Func,180			Val::Bool(_) => ValType::Bool,181			Val::Null => ValType::Null,182			Val::Intristic(_, _) => ValType::Func,183			Val::Lazy(_) => self.clone().unwrap_if_lazy()?.value_type()?,184		})185	}186	#[cfg(feature = "faster")]187	pub fn into_json(self, padding: usize) -> Result<Rc<str>> {188		manifest_json_ex(&self, &" ".repeat(padding)).map(|s| s.into())189	}190	#[cfg(not(feature = "faster"))]191	pub fn into_json(self, padding: usize) -> Result<Rc<str>> {192		with_state(|s| {193			let ctx = s194				.create_default_context()?195				.with_var("__tmp__to_json__".into(), self)?;196			Ok(evaluate(197				ctx,198				&el!(Expr::Apply(199					el!(Expr::Index(200						el!(Expr::Var("std".into())),201						el!(Expr::Str("manifestJsonEx".into()))202					)),203					ArgsDesc(vec![204						Arg(None, el!(Expr::Var("__tmp__to_json__".into()))),205						Arg(None, el!(Expr::Str(" ".repeat(padding).into())))206					]),207					false208				)),209			)?210			.try_cast_str("to json")?)211		})212	}213}214215fn is_function_like(val: &Val) -> bool {216	matches!(val, Val::Func(_) | Val::Intristic(_, _))217}218219/// Implements std.primitiveEquals builtin220pub fn primitive_equals(val_a: &Val, val_b: &Val) -> Result<bool> {221	Ok(match (val_a.unwrap_if_lazy()?, val_b.unwrap_if_lazy()?) {222		(Val::Bool(a), Val::Bool(b)) => a == b,223		(Val::Null, Val::Null) => true,224		(Val::Str(a), Val::Str(b)) => a == b,225		(Val::Num(a), Val::Num(b)) => (a - b).abs() <= f64::EPSILON,226		(Val::Arr(_), Val::Arr(_)) => create_error_result(Error::RuntimeError(227			"primitiveEquals operates on primitive types, got array".into(),228		))?,229		(Val::Obj(_), Val::Obj(_)) => create_error_result(Error::RuntimeError(230			"primitiveEquals operates on primitive types, got object".into(),231		))?,232		(a, b) if is_function_like(&a) && is_function_like(&b) => create_error_result(233			Error::RuntimeError("cannot test equality of functions".into()),234		)?,235		(_, _) => false,236	})237}238239/// Native implementation of std.equals240pub fn equals(val_a: &Val, val_b: &Val) -> Result<bool> {241	let val_a = val_a.unwrap_if_lazy()?;242	let val_b = val_b.unwrap_if_lazy()?;243244	if val_a.value_type()? != val_b.value_type()? {245		return Ok(false);246	}247	match (val_a, val_b) {248		// Cant test for ptr equality, because all fields needs to be evaluated249		(Val::Arr(a), Val::Arr(b)) => {250			if a.len() != b.len() {251				return Ok(false);252			}253			for (a, b) in a.iter().zip(b.iter()) {254				if !equals(&a.unwrap_if_lazy()?, &b.unwrap_if_lazy()?)? {255					return Ok(false);256				}257			}258			Ok(true)259		}260		(Val::Obj(a), Val::Obj(b)) => {261			let fields = a.visible_fields();262			if fields != b.visible_fields() {263				return Ok(false);264			}265			for field in fields {266				if !equals(&a.get(field.clone())?.unwrap(), &b.get(field)?.unwrap())? {267					return Ok(false);268				}269			}270			Ok(true)271		}272		(a, b) => Ok(primitive_equals(&a, &b)?),273	}274}275276pub fn manifest_json_ex(val: &Val, padding: &str) -> Result<String> {277	let mut out = String::new();278	manifest_json_ex_buf(val, &mut out, padding, &mut String::new())?;279	Ok(out)280}281fn manifest_json_ex_buf(282	val: &Val,283	buf: &mut String,284	padding: &str,285	cur_padding: &mut String,286) -> Result<()> {287	use std::fmt::Write;288	match val.unwrap_if_lazy()? {289		Val::Bool(v) => {290			if v {291				buf.push_str("true");292			} else {293				buf.push_str("false");294			}295		}296		Val::Null => buf.push_str("null"),297		Val::Str(s) => buf.push_str(&escape_string_json(&s)),298		Val::Num(n) => write!(buf, "{}", n).unwrap(),299		Val::Arr(items) => {300			buf.push_str("[\n");301			if !items.is_empty() {302				let old_len = cur_padding.len();303				cur_padding.push_str(padding);304				for (i, item) in items.iter().enumerate() {305					if i != 0 {306						buf.push_str(",\n")307					}308					buf.push_str(cur_padding);309					manifest_json_ex_buf(item, buf, padding, cur_padding)?;310				}311				cur_padding.truncate(old_len);312			}313			buf.push('\n');314			buf.push_str(cur_padding);315			buf.push(']');316		}317		Val::Obj(obj) => {318			buf.push_str("{\n");319			let fields = obj.visible_fields();320			if !fields.is_empty() {321				let old_len = cur_padding.len();322				cur_padding.push_str(padding);323				for (i, field) in fields.into_iter().enumerate() {324					if i != 0 {325						buf.push_str(",\n")326					}327					buf.push_str(cur_padding);328					buf.push_str(&escape_string_json(&field));329					buf.push_str(": ");330					manifest_json_ex_buf(&obj.get(field)?.unwrap(), buf, padding, cur_padding)?;331				}332				cur_padding.truncate(old_len);333			}334			buf.push('\n');335			buf.push_str(cur_padding);336			buf.push('}');337		}338		Val::Func(_) | Val::Intristic(_, _) => create_error_result(Error::RuntimeError("tried to manifest function".into()))?,339		Val::Lazy(_) => unreachable!(),340	};341	Ok(())342}343pub fn escape_string_json(s: &str) -> String {344	use std::fmt::Write;345	let mut out = String::new();346	out.push('"');347	for c in s.chars() {348		match c {349			'"' => out.push_str("\\\""),350			'\\' => out.push_str("\\\\"),351			'\u{0008}' => out.push_str("\\b"),352			'\u{000c}' => out.push_str("\\f"),353			'\n' => out.push_str("\\n"),354			'\r' => out.push_str("\\r"),355			'\t' => out.push_str("\\t"),356			c if c < 32 as char || (c >= 127 as char && c <= 159 as char) => {357				write!(out, "\\u{:04x}", c as u32).unwrap()358			}359			c => out.push(c),360		}361	}362	out.push('"');363	out364}365366#[test]367fn json_test() {368	assert_eq!(escape_string_json("\u{001f}"), "\"\\u001f\"")369}

1use crate::{2	create_error_result, evaluate,3	function::{parse_function_call, place_args},4	with_state, Context, Error, ObjValue, Result,5};6use jrsonnet_parser::{el, Arg, ArgsDesc, Expr, LocExpr, ParamsDesc};7use std::{8	cell::RefCell,9	fmt::{Debug, Display},10	rc::Rc,11};1213enum LazyValInternals {14	Computed(Val),15	Waiting(Box<dyn Fn() -> Result<Val>>),16}17#[derive(Clone)]18pub struct LazyVal(Rc<RefCell<LazyValInternals>>);19impl LazyVal {20	pub fn new(f: Box<dyn Fn() -> Result<Val>>) -> Self {21		LazyVal(Rc::new(RefCell::new(LazyValInternals::Waiting(f))))22	}23	pub fn new_resolved(val: Val) -> Self {24		LazyVal(Rc::new(RefCell::new(LazyValInternals::Computed(val))))25	}26	pub fn evaluate(&self) -> Result<Val> {27		let new_value = match &*self.0.borrow() {28			LazyValInternals::Computed(v) => return Ok(v.clone()),29			LazyValInternals::Waiting(f) => f()?,30		};31		*self.0.borrow_mut() = LazyValInternals::Computed(new_value.clone());32		Ok(new_value)33	}34}3536#[macro_export]37macro_rules! lazy_val {38	($f: expr) => {39		$crate::LazyVal::new(Box::new($f))40	};41}42#[macro_export]43macro_rules! resolved_lazy_val {44	($f: expr) => {45		$crate::LazyVal::new_resolved($f)46	};47}48impl Debug for LazyVal {49	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {50		write!(f, "Lazy")51	}52}53impl PartialEq for LazyVal {54	fn eq(&self, other: &Self) -> bool {55		Rc::ptr_eq(&self.0, &other.0)56	}57}5859#[derive(Debug, PartialEq)]60pub struct FuncDesc {61	pub ctx: Context,62	pub params: ParamsDesc,63	pub body: LocExpr,64}65impl FuncDesc {66	/// This function is always inlined to make tailstrict work67	pub fn evaluate(&self, call_ctx: Context, args: &ArgsDesc, tailstrict: bool) -> Result<Val> {68		let ctx = parse_function_call(69			call_ctx,70			Some(self.ctx.clone()),71			&self.params,72			args,73			tailstrict,74		)?;75		evaluate(ctx, &self.body)76	}7778	pub fn evaluate_values(&self, call_ctx: Context, args: &[Val]) -> Result<Val> {79		let ctx = place_args(call_ctx, Some(self.ctx.clone()), &self.params, args)?;80		evaluate(ctx, &self.body)81	}82}8384#[derive(Debug, Clone, Copy, PartialEq)]85pub enum ValType {86	Bool,87	Null,88	Str,89	Num,90	Arr,91	Obj,92	Func,93}94impl ValType {95	pub fn name(&self) -> &'static str {96		use ValType::*;97		match self {98			Bool => "boolean",99			Null => "null",100			Str => "string",101			Num => "number",102			Arr => "array",103			Obj => "object",104			Func => "function",105		}106	}107}108impl Display for ValType {109	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {110		write!(f, "{}", self.name())111	}112}113114#[derive(Debug, Clone)]115pub enum Val {116	Bool(bool),117	Null,118	Str(Rc<str>),119	Num(f64),120	Lazy(LazyVal),121	Arr(Rc<Vec<Val>>),122	Obj(ObjValue),123	Func(Rc<FuncDesc>),124125	// Library functions implemented in native126	Intristic(Rc<str>, Rc<str>),127}128macro_rules! matches_unwrap {129	($e: expr, $p: pat, $r: expr) => {130		match $e {131			$p => $r,132			_ => panic!("no match"),133			}134	};135}136impl Val {137	/// Creates Val::Num after checking for overflow. As numbers are f64, we can just check for finity138	pub fn new_checked_num(num: f64) -> Result<Val> {139		if num.is_finite() {140			Ok(Val::Num(num))141		} else {142			create_error_result(Error::RuntimeError("overflow".into()))143		}144	}145146	pub fn assert_type(&self, context: &'static str, val_type: ValType) -> Result<()> {147		let this_type = self.value_type()?;148		if this_type != val_type {149			create_error_result(Error::TypeMismatch(context, vec![val_type], this_type))150		} else {151			Ok(())152		}153	}154	pub fn try_cast_bool(self, context: &'static str) -> Result<bool> {155		self.assert_type(context, ValType::Bool)?;156		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Bool(v), v))157	}158	pub fn try_cast_str(self, context: &'static str) -> Result<Rc<str>> {159		self.assert_type(context, ValType::Str)?;160		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Str(v), v))161	}162	pub fn try_cast_num(self, context: &'static str) -> Result<f64> {163		self.assert_type(context, ValType::Num)?;164		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Num(v), v))165	}166	pub fn unwrap_if_lazy(&self) -> Result<Self> {167		Ok(if let Val::Lazy(v) = self {168			v.evaluate()?.unwrap_if_lazy()?169		} else {170			self.clone()171		})172	}173	pub fn value_type(&self) -> Result<ValType> {174		Ok(match self {175			Val::Str(..) => ValType::Str,176			Val::Num(..) => ValType::Num,177			Val::Arr(..) => ValType::Arr,178			Val::Obj(..) => ValType::Obj,179			Val::Func(..) => ValType::Func,180			Val::Bool(_) => ValType::Bool,181			Val::Null => ValType::Null,182			Val::Intristic(_, _) => ValType::Func,183			Val::Lazy(_) => self.clone().unwrap_if_lazy()?.value_type()?,184		})185	}186	#[cfg(feature = "faster")]187	pub fn into_json(self, padding: usize) -> Result<Rc<str>> {188		manifest_json_ex(&self, &" ".repeat(padding)).map(|s| s.into())189	}190	#[cfg(not(feature = "faster"))]191	pub fn into_json(self, padding: usize) -> Result<Rc<str>> {192		with_state(|s| {193			let ctx = s194				.create_default_context()?195				.with_var("__tmp__to_json__".into(), self)?;196			Ok(evaluate(197				ctx,198				&el!(Expr::Apply(199					el!(Expr::Index(200						el!(Expr::Var("std".into())),201						el!(Expr::Str("manifestJsonEx".into()))202					)),203					ArgsDesc(vec![204						Arg(None, el!(Expr::Var("__tmp__to_json__".into()))),205						Arg(None, el!(Expr::Str(" ".repeat(padding).into())))206					]),207					false208				)),209			)?210			.try_cast_str("to json")?)211		})212	}213	pub fn into_yaml(self, padding: usize) -> Result<Rc<str>> {214		with_state(|s| {215			let ctx = s216				.create_default_context()?217				.with_var("__tmp__to_json__".into(), self)?;218			Ok(evaluate(219				ctx,220				&el!(Expr::Apply(221					el!(Expr::Index(222						el!(Expr::Var("std".into())),223						el!(Expr::Str("manifestYamlDoc".into()))224					)),225					ArgsDesc(vec![226						Arg(None, el!(Expr::Var("__tmp__to_json__".into()))),227						Arg(None, el!(Expr::Str(" ".repeat(padding).into())))228					]),229					false230				)),231			)?232			.try_cast_str("to json")?)233		})234	}235}236237fn is_function_like(val: &Val) -> bool {238	matches!(val, Val::Func(_) | Val::Intristic(_, _))239}240241/// Implements std.primitiveEquals builtin242pub fn primitive_equals(val_a: &Val, val_b: &Val) -> Result<bool> {243	Ok(match (val_a.unwrap_if_lazy()?, val_b.unwrap_if_lazy()?) {244		(Val::Bool(a), Val::Bool(b)) => a == b,245		(Val::Null, Val::Null) => true,246		(Val::Str(a), Val::Str(b)) => a == b,247		(Val::Num(a), Val::Num(b)) => (a - b).abs() <= f64::EPSILON,248		(Val::Arr(_), Val::Arr(_)) => create_error_result(Error::RuntimeError(249			"primitiveEquals operates on primitive types, got array".into(),250		))?,251		(Val::Obj(_), Val::Obj(_)) => create_error_result(Error::RuntimeError(252			"primitiveEquals operates on primitive types, got object".into(),253		))?,254		(a, b) if is_function_like(&a) && is_function_like(&b) => create_error_result(255			Error::RuntimeError("cannot test equality of functions".into()),256		)?,257		(_, _) => false,258	})259}260261/// Native implementation of std.equals262pub fn equals(val_a: &Val, val_b: &Val) -> Result<bool> {263	let val_a = val_a.unwrap_if_lazy()?;264	let val_b = val_b.unwrap_if_lazy()?;265266	if val_a.value_type()? != val_b.value_type()? {267		return Ok(false);268	}269	match (val_a, val_b) {270		// Cant test for ptr equality, because all fields needs to be evaluated271		(Val::Arr(a), Val::Arr(b)) => {272			if a.len() != b.len() {273				return Ok(false);274			}275			for (a, b) in a.iter().zip(b.iter()) {276				if !equals(&a.unwrap_if_lazy()?, &b.unwrap_if_lazy()?)? {277					return Ok(false);278				}279			}280			Ok(true)281		}282		(Val::Obj(a), Val::Obj(b)) => {283			let fields = a.visible_fields();284			if fields != b.visible_fields() {285				return Ok(false);286			}287			for field in fields {288				if !equals(&a.get(field.clone())?.unwrap(), &b.get(field)?.unwrap())? {289					return Ok(false);290				}291			}292			Ok(true)293		}294		(a, b) => Ok(primitive_equals(&a, &b)?),295	}296}297298pub fn manifest_json_ex(val: &Val, padding: &str) -> Result<String> {299	let mut out = String::new();300	manifest_json_ex_buf(val, &mut out, padding, &mut String::new())?;301	Ok(out)302}303fn manifest_json_ex_buf(304	val: &Val,305	buf: &mut String,306	padding: &str,307	cur_padding: &mut String,308) -> Result<()> {309	use std::fmt::Write;310	match val.unwrap_if_lazy()? {311		Val::Bool(v) => {312			if v {313				buf.push_str("true");314			} else {315				buf.push_str("false");316			}317		}318		Val::Null => buf.push_str("null"),319		Val::Str(s) => buf.push_str(&escape_string_json(&s)),320		Val::Num(n) => write!(buf, "{}", n).unwrap(),321		Val::Arr(items) => {322			buf.push_str("[\n");323			if !items.is_empty() {324				let old_len = cur_padding.len();325				cur_padding.push_str(padding);326				for (i, item) in items.iter().enumerate() {327					if i != 0 {328						buf.push_str(",\n")329					}330					buf.push_str(cur_padding);331					manifest_json_ex_buf(item, buf, padding, cur_padding)?;332				}333				cur_padding.truncate(old_len);334			}335			buf.push('\n');336			buf.push_str(cur_padding);337			buf.push(']');338		}339		Val::Obj(obj) => {340			buf.push_str("{\n");341			let fields = obj.visible_fields();342			if !fields.is_empty() {343				let old_len = cur_padding.len();344				cur_padding.push_str(padding);345				for (i, field) in fields.into_iter().enumerate() {346					if i != 0 {347						buf.push_str(",\n")348					}349					buf.push_str(cur_padding);350					buf.push_str(&escape_string_json(&field));351					buf.push_str(": ");352					manifest_json_ex_buf(&obj.get(field)?.unwrap(), buf, padding, cur_padding)?;353				}354				cur_padding.truncate(old_len);355			}356			buf.push('\n');357			buf.push_str(cur_padding);358			buf.push('}');359		}360		Val::Func(_) | Val::Intristic(_, _) => create_error_result(Error::RuntimeError("tried to manifest function".into()))?,361		Val::Lazy(_) => unreachable!(),362	};363	Ok(())364}365pub fn escape_string_json(s: &str) -> String {366	use std::fmt::Write;367	let mut out = String::new();368	out.push('"');369	for c in s.chars() {370		match c {371			'"' => out.push_str("\\\""),372			'\\' => out.push_str("\\\\"),373			'\u{0008}' => out.push_str("\\b"),374			'\u{000c}' => out.push_str("\\f"),375			'\n' => out.push_str("\\n"),376			'\r' => out.push_str("\\r"),377			'\t' => out.push_str("\\t"),378			c if c < 32 as char || (c >= 127 as char && c <= 159 as char) => {379				write!(out, "\\u{:04x}", c as u32).unwrap()380			}381			c => out.push(c),382		}383	}384	out.push('"');385	out386}387388#[test]389fn json_test() {390	assert_eq!(escape_string_json("\u{001f}"), "\"\\u001f\"")391}