git.delta.rocks / jrsonnet / refs/commits / 1e2e6e2fa219

1use std::fmt::Debug;23pub use arglike::{ArgLike, ArgsLike, TlaArg};4use jrsonnet_gcmodule::{Cc, Trace};5use jrsonnet_interner::IStr;6pub use jrsonnet_macros::builtin;7use jrsonnet_parser::{Destruct, Expr, ExprLocation, LocExpr, ParamsDesc};89use self::{10	arglike::OptionalContext,11	builtin::{Builtin, StaticBuiltin},12	native::NativeDesc,13	parse::{parse_default_function_call, parse_function_call},14};15use crate::{evaluate, evaluate_trivial, gc::TraceBox, tb, Context, ContextBuilder, Result, Val};1617pub mod arglike;18pub mod builtin;19pub mod native;20pub mod parse;2122/// Function callsite location.23/// Either from other jsonnet code, specified by expression location, or from native (without location).24#[derive(Clone, Copy)]25pub struct CallLocation<'l>(pub Option<&'l ExprLocation>);26impl<'l> CallLocation<'l> {27	/// Construct new location for calls coming from specified jsonnet expression location.28	pub const fn new(loc: &'l ExprLocation) -> Self {29		Self(Some(loc))30	}31}32impl CallLocation<'static> {33	/// Construct new location for calls coming from native code.34	pub const fn native() -> Self {35		Self(None)36	}37}3839/// Represents Jsonnet function defined in code.40#[derive(Debug, PartialEq, Trace)]41pub struct FuncDesc {42	/// # Example43	///44	/// In expressions like this, deducted to `a`, unspecified otherwise.45	/// ```jsonnet46	/// local a = function() ...47	/// local a() ...48	/// { a: function() ... }49	/// { a() = ... }50	/// ```51	pub name: IStr,52	/// Context, in which this function was evaluated.53	///54	/// # Example55	/// In56	/// ```jsonnet57	/// local a = 2;58	/// function() ...59	/// ```60	/// context will contain `a`.61	pub ctx: Context,6263	/// Function parameter definition64	pub params: ParamsDesc,65	/// Function body66	pub body: LocExpr,67}68impl FuncDesc {69	/// Create body context, but fill arguments without defaults with lazy error70	pub fn default_body_context(&self) -> Result<Context> {71		parse_default_function_call(self.ctx.clone(), &self.params)72	}7374	/// Create context, with which body code will run75	pub fn call_body_context(76		&self,77		call_ctx: Context,78		args: &dyn ArgsLike,79		tailstrict: bool,80	) -> Result<Context> {81		parse_function_call(call_ctx, self.ctx.clone(), &self.params, args, tailstrict)82	}8384	pub fn evaluate_trivial(&self) -> Option<Val> {85		evaluate_trivial(&self.body)86	}87}8889/// Represents a Jsonnet function value, including plain functions and user-provided builtins.90#[allow(clippy::module_name_repetitions)]91#[derive(Trace, Clone)]92pub enum FuncVal {93	/// Identity function, kept this way for comparsions.94	Id,95	/// Plain function implemented in jsonnet.96	Normal(Cc<FuncDesc>),97	/// Standard library function.98	StaticBuiltin(#[trace(skip)] &'static dyn StaticBuiltin),99	/// User-provided function.100	Builtin(Cc<TraceBox<dyn Builtin>>),101}102103impl Debug for FuncVal {104	fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {105		match self {106			Self::Id => f.debug_tuple("Id").finish(),107			Self::Normal(arg0) => f.debug_tuple("Normal").field(arg0).finish(),108			Self::StaticBuiltin(arg0) => {109				f.debug_tuple("StaticBuiltin").field(&arg0.name()).finish()110			}111			Self::Builtin(arg0) => f.debug_tuple("Builtin").field(&arg0.name()).finish(),112		}113	}114}115116impl FuncVal {117	pub fn builtin(builtin: impl Builtin) -> Self {118		Self::Builtin(Cc::new(tb!(builtin)))119	}120	/// Amount of non-default required arguments121	pub fn params_len(&self) -> usize {122		match self {123			Self::Id => 1,124			Self::Normal(n) => n.params.iter().filter(|p| p.1.is_none()).count(),125			Self::StaticBuiltin(i) => i.params().iter().filter(|p| !p.has_default).count(),126			Self::Builtin(i) => i.params().iter().filter(|p| !p.has_default).count(),127		}128	}129	/// Function name, as defined in code.130	pub fn name(&self) -> IStr {131		match self {132			Self::Id => "id".into(),133			Self::Normal(normal) => normal.name.clone(),134			Self::StaticBuiltin(builtin) => builtin.name().into(),135			Self::Builtin(builtin) => builtin.name().into(),136		}137	}138	/// Call function using arguments evaluated in specified `call_ctx` [`Context`].139	///140	/// If `tailstrict` is specified - then arguments will be evaluated before being passed to function body.141	pub fn evaluate(142		&self,143		call_ctx: Context,144		loc: CallLocation<'_>,145		args: &dyn ArgsLike,146		tailstrict: bool,147	) -> Result<Val> {148		match self {149			Self::Id => {150				#[allow(clippy::unnecessary_wraps)]151				#[builtin]152				const fn builtin_id(x: Val) -> Val {153					x154				}155				static ID: &builtin_id = &builtin_id {};156157				ID.call(call_ctx, loc, args)158			}159			Self::Normal(func) => {160				let body_ctx = func.call_body_context(call_ctx, args, tailstrict)?;161				evaluate(body_ctx, &func.body)162			}163			Self::StaticBuiltin(b) => b.call(call_ctx, loc, args),164			Self::Builtin(b) => b.call(call_ctx, loc, args),165		}166	}167	pub fn evaluate_simple<A: ArgsLike + OptionalContext>(168		&self,169		args: &A,170		tailstrict: bool,171	) -> Result<Val> {172		self.evaluate(173			ContextBuilder::dangerous_empty_state().build(),174			CallLocation::native(),175			args,176			tailstrict,177		)178	}179	/// Convert jsonnet function to plain `Fn` value.180	pub fn into_native<D: NativeDesc>(self) -> D::Value {181		D::into_native(self)182	}183184	/// Is this function an indentity function.185	///186	/// Currently only works for builtin `std.id`, aka `Self::Id` value, and `function(x) x`.187	///188	/// This function should only be used for optimization, not for the conditional logic, i.e code should work with syntetic identity function too189	pub fn is_identity(&self) -> bool {190		match self {191			Self::Id => true,192			Self::Normal(desc) => {193				if desc.params.len() != 1 {194					return false;195				}196				let param = &desc.params[0];197				if param.1.is_some() {198					return false;199				}200				#[allow(clippy::infallible_destructuring_match)]201				let id = match &param.0 {202					Destruct::Full(id) => id,203					#[cfg(feature = "exp-destruct")]204					_ => return false,205				};206				&desc.body.0 as &Expr == &Expr::Var(id.clone())207			}208			_ => false,209		}210	}211	/// Identity function value.212	pub const fn identity() -> Self {213		Self::Id214	}215216	pub fn evaluate_trivial(&self) -> Option<Val> {217		match self {218			FuncVal::Normal(n) => n.evaluate_trivial(),219			_ => None,220		}221	}222}