git.delta.rocks / jrsonnet / refs/commits / 6db420cedf84

1use crate::{2	create_error, evaluate,3	function::{parse_function_call, place_args},4	Context, Error, ObjValue, Result,5};6use jsonnet_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, Clone)]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, PartialEq, 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(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	pub fn assert_type(&self, context: &'static str, val_type: ValType) -> Result<()> {138		let this_type = self.value_type()?;139		if this_type != val_type {140			create_error(Error::TypeMismatch(context, vec![val_type], this_type))141		} else {142			Ok(())143		}144	}145	pub fn try_cast_bool(self, context: &'static str) -> Result<bool> {146		self.assert_type(context, ValType::Bool)?;147		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Bool(v), v))148	}149	pub fn try_cast_str(self, context: &'static str) -> Result<Rc<str>> {150		self.assert_type(context, ValType::Str)?;151		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Str(v), v))152	}153	pub fn try_cast_num(self, context: &'static str) -> Result<f64> {154		self.assert_type(context, ValType::Num)?;155		Ok(matches_unwrap!(self.unwrap_if_lazy()?, Val::Num(v), v))156	}157	pub fn unwrap_if_lazy(&self) -> Result<Self> {158		Ok(if let Val::Lazy(v) = self {159			v.evaluate()?.unwrap_if_lazy()?160		} else {161			self.clone()162		})163	}164	pub fn value_type(&self) -> Result<ValType> {165		Ok(match self {166			Val::Str(..) => ValType::Str,167			Val::Num(..) => ValType::Num,168			Val::Arr(..) => ValType::Arr,169			Val::Obj(..) => ValType::Obj,170			Val::Func(..) => ValType::Func,171			Val::Bool(_) => ValType::Bool,172			Val::Null => ValType::Null,173			Val::Intristic(_, _) => ValType::Func,174			Val::Lazy(_) => self.clone().unwrap_if_lazy()?.value_type()?,175		})176	}177	#[cfg(feature = "faster")]178	pub fn into_json(self, padding: usize) -> Result<Rc<str>> {179		manifest_json_ex(&self, &" ".repeat(padding)).map(|s| s.into())180	}181	#[cfg(not(feature = "faster"))]182	pub fn into_json(self, padding: usize) -> Result<Rc<str>> {183		with_state(|s| {184			let ctx = s185				.create_default_context()?186				.with_var("__tmp__to_json__".into(), self)?;187			Ok(evaluate(188				ctx,189				&el!(Expr::Apply(190					el!(Expr::Index(191						el!(Expr::Var("std".into())),192						el!(Expr::Str("manifestJsonEx".into()))193					)),194					ArgsDesc(vec![195						Arg(None, el!(Expr::Var("__tmp__to_json__".into()))),196						Arg(None, el!(Expr::Str(" ".repeat(padding).into())))197					]),198					false199				)),200			)?201			.try_cast_str("to json")?)202		})203	}204}205206pub fn manifest_json_ex(val: &Val, padding: &str) -> Result<String> {207	let mut out = String::new();208	manifest_json_ex_buf(val, &mut out, padding, &mut String::new())?;209	Ok(out)210}211fn manifest_json_ex_buf(212	val: &Val,213	buf: &mut String,214	padding: &str,215	cur_padding: &mut String,216) -> Result<()> {217	use std::fmt::Write;218	match val.unwrap_if_lazy()? {219		Val::Bool(v) => {220			if v {221				buf.push_str("true");222			} else {223				buf.push_str("false");224			}225		}226		Val::Null => buf.push_str("null"),227		Val::Str(s) => buf.push_str(&escape_string_json(&s)),228		Val::Num(n) => write!(buf, "{}", n).unwrap(),229		Val::Arr(items) => {230			buf.push_str("[\n");231			if !items.is_empty() {232				let old_len = cur_padding.len();233				cur_padding.push_str(padding);234				for (i, item) in items.iter().enumerate() {235					if i != 0 {236						buf.push_str(",\n")237					}238					buf.push_str(cur_padding);239					manifest_json_ex_buf(item, buf, padding, cur_padding)?;240				}241				cur_padding.truncate(old_len);242			}243			buf.push('\n');244			buf.push_str(cur_padding);245			buf.push(']');246		}247		Val::Obj(obj) => {248			buf.push_str("{\n");249			let fields = obj.visible_fields();250			if !fields.is_empty() {251				let old_len = cur_padding.len();252				cur_padding.push_str(padding);253				for (i, field) in fields.into_iter().enumerate() {254					if i != 0 {255						buf.push_str(",\n")256					}257					buf.push_str(cur_padding);258					buf.push_str(&escape_string_json(&field));259					buf.push_str(": ");260					manifest_json_ex_buf(&obj.get(field)?.unwrap(), buf, padding, cur_padding)?;261				}262				cur_padding.truncate(old_len);263			}264			buf.push('\n');265			buf.push_str(cur_padding);266			buf.push('}');267		}268		Val::Func(_) | Val::Intristic(_, _) => panic!("tried to manifest function"),269		Val::Lazy(_) => unreachable!(),270	};271	Ok(())272}273pub fn escape_string_json(s: &str) -> String {274	use std::fmt::Write;275	let mut out = String::new();276	out.push('"');277	for c in s.chars() {278		match c {279			'"' => out.push_str("\\\""),280			'\\' => out.push_str("\\\\"),281			'\u{0008}' => out.push_str("\\b"),282			'\u{000c}' => out.push_str("\\f"),283			'\n' => out.push_str("\\n"),284			'\r' => out.push_str("\\r"),285			'\t' => out.push_str("\\t"),286			c if c < 32 as char || (c >= 127 as char && c <= 159 as char) => {287				write!(out, "\\u{:04x}", c as u32).unwrap()288			}289			c => out.push(c),290		}291	}292	out.push('"');293	out294}295296#[test]297fn json_test() {298	assert_eq!(escape_string_json("\u{001f}"), "\"\\u001f\"")299}