nanvm_lib/vm/any/
instanceof_.rs

1use crate::vm::{Any, IVm, ToAny, Unpacked};
2
3/// The constructors `instanceof` may name: the EDAG's `constructorId`, a
4/// closed list — `Array` alone today, where `Map` and `Set` are one variant
5/// each once the VM has such values. A name, not a value: no global is a
6/// value in the EDAG, so the operator's right side is carried as the word
7/// it is, and a variant here rather than an `Any<A>`.
8#[derive(Clone, Copy, Debug, PartialEq, Eq)]
9pub enum Constructor {
10    Array,
11}
12
13impl<A: IVm> Any<A> {
14    /// `instanceof`, against a built-in constructor. Not a `core::ops`
15    /// trait — Rust has no operator to spell it with — so this is a plain
16    /// method, named as `typeof_` is: a trailing underscore keeps the
17    /// reserved-word spelling recognizable. Never throws: the right side is
18    /// a constructor by construction, so JavaScript's `TypeError` for a
19    /// non-callable right operand has no case here; stays a `Result` to
20    /// match every other operator's shape.
21    /// <https://tc39.es/ecma262/#sec-instanceofoperator>
22    pub fn instanceof_(&self, constructor: Constructor) -> Result<Any<A>, Any<A>> {
23        Ok(match constructor {
24            Constructor::Array => self.with_unpacked(|v| matches!(v, Unpacked::Array(_))),
25        }
26        .to_any())
27    }
28}
nanvm_lib/vm/any/instanceof_.rs

nanvm_lib/vm/any/
instanceof_.rs
