git.delta.rocks / jrsonnet / refs/commits / bde2637fa85f

1use std::borrow::Cow;23use jrsonnet_gcmodule::Trace;45use super::{arglike::ArgsLike, parse::parse_builtin_call, CallLocation};6use crate::{error::Result, gc::TraceBox, Context, State, Val};78pub type BuiltinParamName = Cow<'static, str>;910#[derive(Clone, Trace)]11pub struct BuiltinParam {12	pub name: BuiltinParamName,13	pub has_default: bool,14}1516/// Do not implement it directly, instead use #[builtin] macro17pub trait Builtin: Trace {18	fn name(&self) -> &str;19	fn params(&self) -> &[BuiltinParam];20	fn call(&self, s: State, ctx: Context, loc: CallLocation, args: &dyn ArgsLike) -> Result<Val>;21}2223pub trait StaticBuiltin: Builtin + Send + Sync24where25	Self: 'static,26{27	// In impl, to make it object safe:28	// const INST: &'static Self;29}3031#[derive(Trace)]32pub struct NativeCallback {33	pub(crate) params: Vec<BuiltinParam>,34	handler: TraceBox<dyn NativeCallbackHandler>,35}36impl NativeCallback {37	#[deprecated = "prefer using builtins directly, use this interface only for bindings"]38	pub fn new(params: Vec<BuiltinParam>, handler: TraceBox<dyn NativeCallbackHandler>) -> Self {39		Self { params, handler }40	}41}4243impl Builtin for NativeCallback {44	fn name(&self) -> &str {45		// TODO: standard natives gets their names from definition46		// But builitins should already have them47		"<native>"48	}4950	fn params(&self) -> &[BuiltinParam] {51		&self.params52	}5354	fn call(&self, s: State, ctx: Context, _loc: CallLocation, args: &dyn ArgsLike) -> Result<Val> {55		let args = parse_builtin_call(s.clone(), ctx, &self.params, args, true)?;56		let mut out_args = Vec::with_capacity(self.params.len());57		for p in &self.params {58			out_args.push(args[&p.name].evaluate(s.clone())?);59		}60		self.handler.call(s, &out_args)61	}62}6364pub trait NativeCallbackHandler: Trace {65	fn call(&self, s: State, args: &[Val]) -> Result<Val>;66}