refactor(users/glittershark): Rename to grfn r/2485

Rename my //users directory and all places that refer to glittershark to
grfn, including nix references and documentation.

This may require some extra attention inside of gerrit's database after
it lands to allow me to actually push things.

Change-Id: I4728b7ec2c60024392c1c1fa6e0d4a59b3e266fa
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2933
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: lukegb <lukegb@tvl.fyi>
Reviewed-by: glittershark <grfn@gws.fyi>

1 files changed, 203 insertions, 0 deletions

diff --git a/users/grfn/achilles/src/interpreter/value.rs b/users/grfn/achilles/src/interpreter/value.rs
new file mode 100644
index 000000000000..55ba42f9de58
--- /dev/null
+++ b/users/grfn/achilles/src/interpreter/value.rs
@@ -0,0 +1,203 @@
+use std::borrow::Cow;
+use std::convert::TryFrom;
+use std::fmt::{self, Display};
+use std::ops::{Add, Div, Mul, Neg, Sub};
+use std::rc::Rc;
+use std::result;
+
+use derive_more::{Deref, From, TryInto};
+
+use super::{Error, Result};
+use crate::ast::hir::Expr;
+use crate::ast::{FunctionType, Ident, Type};
+
+#[derive(Debug, Clone)]
+pub struct Function<'a> {
+    pub type_: FunctionType<'a>,
+    pub args: Vec<Ident<'a>>,
+    pub body: Expr<'a, Type<'a>>,
+}
+
+#[derive(From, TryInto)]
+#[try_into(owned, ref)]
+pub enum Val<'a> {
+    Int(i64),
+    Float(f64),
+    Bool(bool),
+    String(Cow<'a, str>),
+    Function(Function<'a>),
+}
+
+impl<'a> TryFrom<Val<'a>> for String {
+    type Error = ();
+
+    fn try_from(value: Val<'a>) -> result::Result<Self, Self::Error> {
+        match value {
+            Val::String(s) => Ok(s.into_owned()),
+            _ => Err(()),
+        }
+    }
+}
+
+impl<'a> fmt::Debug for Val<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Val::Int(x) => f.debug_tuple("Int").field(x).finish(),
+            Val::Float(x) => f.debug_tuple("Float").field(x).finish(),
+            Val::Bool(x) => f.debug_tuple("Bool").field(x).finish(),
+            Val::String(s) => f.debug_tuple("String").field(s).finish(),
+            Val::Function(Function { type_, .. }) => {
+                f.debug_struct("Function").field("type_", type_).finish()
+            }
+        }
+    }
+}
+
+impl<'a> PartialEq for Val<'a> {
+    fn eq(&self, other: &Self) -> bool {
+        match (self, other) {
+            (Val::Int(x), Val::Int(y)) => x == y,
+            (Val::Float(x), Val::Float(y)) => x == y,
+            (Val::Bool(x), Val::Bool(y)) => x == y,
+            (Val::Function(_), Val::Function(_)) => false,
+            (_, _) => false,
+        }
+    }
+}
+
+impl<'a> From<u64> for Val<'a> {
+    fn from(i: u64) -> Self {
+        Self::from(i as i64)
+    }
+}
+
+impl<'a> Display for Val<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Val::Int(x) => x.fmt(f),
+            Val::Float(x) => x.fmt(f),
+            Val::Bool(x) => x.fmt(f),
+            Val::String(s) => write!(f, "{:?}", s),
+            Val::Function(Function { type_, .. }) => write!(f, "<{}>", type_),
+        }
+    }
+}
+
+impl<'a> Val<'a> {
+    pub fn type_(&self) -> Type {
+        match self {
+            Val::Int(_) => Type::Int,
+            Val::Float(_) => Type::Float,
+            Val::Bool(_) => Type::Bool,
+            Val::String(_) => Type::CString,
+            Val::Function(Function { type_, .. }) => Type::Function(type_.clone()),
+        }
+    }
+
+    pub fn as_type<'b, T>(&'b self) -> Result<&'b T>
+    where
+        T: TypeOf + 'b + Clone,
+        &'b T: TryFrom<&'b Self>,
+    {
+        <&T>::try_from(self).map_err(|_| Error::InvalidType {
+            actual: self.type_().to_owned(),
+            expected: <T as TypeOf>::type_of(),
+        })
+    }
+
+    pub fn as_function<'b>(&'b self, function_type: FunctionType) -> Result<&'b Function<'a>> {
+        match self {
+            Val::Function(f) if f.type_ == function_type => Ok(&f),
+            _ => Err(Error::InvalidType {
+                actual: self.type_().to_owned(),
+                expected: Type::Function(function_type.to_owned()),
+            }),
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Clone, Deref)]
+pub struct Value<'a>(Rc<Val<'a>>);
+
+impl<'a> Display for Value<'a> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.0.fmt(f)
+    }
+}
+
+impl<'a, T> From<T> for Value<'a>
+where
+    Val<'a>: From<T>,
+{
+    fn from(x: T) -> Self {
+        Self(Rc::new(x.into()))
+    }
+}
+
+impl<'a> Neg for Value<'a> {
+    type Output = Result<Value<'a>>;
+
+    fn neg(self) -> Self::Output {
+        Ok((-self.as_type::<i64>()?).into())
+    }
+}
+
+impl<'a> Add for Value<'a> {
+    type Output = Result<Value<'a>>;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Ok((self.as_type::<i64>()? + rhs.as_type::<i64>()?).into())
+    }
+}
+
+impl<'a> Sub for Value<'a> {
+    type Output = Result<Value<'a>>;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Ok((self.as_type::<i64>()? - rhs.as_type::<i64>()?).into())
+    }
+}
+
+impl<'a> Mul for Value<'a> {
+    type Output = Result<Value<'a>>;
+
+    fn mul(self, rhs: Self) -> Self::Output {
+        Ok((self.as_type::<i64>()? * rhs.as_type::<i64>()?).into())
+    }
+}
+
+impl<'a> Div for Value<'a> {
+    type Output = Result<Value<'a>>;
+
+    fn div(self, rhs: Self) -> Self::Output {
+        Ok((self.as_type::<f64>()? / rhs.as_type::<f64>()?).into())
+    }
+}
+
+pub trait TypeOf {
+    fn type_of() -> Type<'static>;
+}
+
+impl TypeOf for i64 {
+    fn type_of() -> Type<'static> {
+        Type::Int
+    }
+}
+
+impl TypeOf for bool {
+    fn type_of() -> Type<'static> {
+        Type::Bool
+    }
+}
+
+impl TypeOf for f64 {
+    fn type_of() -> Type<'static> {
+        Type::Float
+    }
+}
+
+impl TypeOf for String {
+    fn type_of() -> Type<'static> {
+        Type::CString
+    }
+}