2 files changed, 197 insertions, 0 deletions

diff --git a/crates/ra_hir_ty/src/lib.rs b/crates/ra_hir_ty/src/lib.rs
new file mode 100644
index 000000000..28859ba63
--- /dev/null
+++ b/crates/ra_hir_ty/src/lib.rs
@@ -0,0 +1,4 @@
+//! Work in Progress: everything related to types, type inference and trait
+//! solving.
+
+pub mod primitive;
diff --git a/crates/ra_hir_ty/src/primitive.rs b/crates/ra_hir_ty/src/primitive.rs
new file mode 100644
index 000000000..02a8179d9
--- /dev/null
+++ b/crates/ra_hir_ty/src/primitive.rs
@@ -0,0 +1,193 @@
+//! Defines primitive types, which have a couple of peculiarities:
+//!
+//! * during type inference, they can be uncertain (ie, `let x = 92;`)
+//! * they don't belong to any particular crate.
+
+use std::fmt;
+
+pub use hir_def::builtin_type::{BuiltinFloat, BuiltinInt, FloatBitness, IntBitness, Signedness};
+
+#[derive(Clone, Copy, Eq, PartialEq, Hash, Debug)]
+pub enum Uncertain<T> {
+    Unknown,
+    Known(T),
+}
+
+impl From<IntTy> for Uncertain<IntTy> {
+    fn from(ty: IntTy) -> Self {
+        Uncertain::Known(ty)
+    }
+}
+
+impl fmt::Display for Uncertain<IntTy> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Uncertain::Unknown => write!(f, "{{integer}}"),
+            Uncertain::Known(ty) => write!(f, "{}", ty),
+        }
+    }
+}
+
+impl From<FloatTy> for Uncertain<FloatTy> {
+    fn from(ty: FloatTy) -> Self {
+        Uncertain::Known(ty)
+    }
+}
+
+impl fmt::Display for Uncertain<FloatTy> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match *self {
+            Uncertain::Unknown => write!(f, "{{float}}"),
+            Uncertain::Known(ty) => write!(f, "{}", ty),
+        }
+    }
+}
+
+#[derive(Copy, Clone, Eq, PartialEq, Hash)]
+pub struct IntTy {
+    pub signedness: Signedness,
+    pub bitness: IntBitness,
+}
+
+impl fmt::Debug for IntTy {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(self, f)
+    }
+}
+
+impl fmt::Display for IntTy {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.ty_to_string())
+    }
+}
+
+impl IntTy {
+    pub fn isize() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::Xsize }
+    }
+
+    pub fn i8() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X8 }
+    }
+
+    pub fn i16() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X16 }
+    }
+
+    pub fn i32() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X32 }
+    }
+
+    pub fn i64() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X64 }
+    }
+
+    pub fn i128() -> IntTy {
+        IntTy { signedness: Signedness::Signed, bitness: IntBitness::X128 }
+    }
+
+    pub fn usize() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::Xsize }
+    }
+
+    pub fn u8() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X8 }
+    }
+
+    pub fn u16() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X16 }
+    }
+
+    pub fn u32() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X32 }
+    }
+
+    pub fn u64() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X64 }
+    }
+
+    pub fn u128() -> IntTy {
+        IntTy { signedness: Signedness::Unsigned, bitness: IntBitness::X128 }
+    }
+
+    pub fn ty_to_string(self) -> &'static str {
+        match (self.signedness, self.bitness) {
+            (Signedness::Signed, IntBitness::Xsize) => "isize",
+            (Signedness::Signed, IntBitness::X8) => "i8",
+            (Signedness::Signed, IntBitness::X16) => "i16",
+            (Signedness::Signed, IntBitness::X32) => "i32",
+            (Signedness::Signed, IntBitness::X64) => "i64",
+            (Signedness::Signed, IntBitness::X128) => "i128",
+            (Signedness::Unsigned, IntBitness::Xsize) => "usize",
+            (Signedness::Unsigned, IntBitness::X8) => "u8",
+            (Signedness::Unsigned, IntBitness::X16) => "u16",
+            (Signedness::Unsigned, IntBitness::X32) => "u32",
+            (Signedness::Unsigned, IntBitness::X64) => "u64",
+            (Signedness::Unsigned, IntBitness::X128) => "u128",
+        }
+    }
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, Hash)]
+pub struct FloatTy {
+    pub bitness: FloatBitness,
+}
+
+impl fmt::Debug for FloatTy {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Display::fmt(self, f)
+    }
+}
+
+impl fmt::Display for FloatTy {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "{}", self.ty_to_string())
+    }
+}
+
+impl FloatTy {
+    pub fn f32() -> FloatTy {
+        FloatTy { bitness: FloatBitness::X32 }
+    }
+
+    pub fn f64() -> FloatTy {
+        FloatTy { bitness: FloatBitness::X64 }
+    }
+
+    pub fn ty_to_string(self) -> &'static str {
+        match self.bitness {
+            FloatBitness::X32 => "f32",
+            FloatBitness::X64 => "f64",
+        }
+    }
+}
+
+impl From<BuiltinInt> for IntTy {
+    fn from(t: BuiltinInt) -> Self {
+        IntTy { signedness: t.signedness, bitness: t.bitness }
+    }
+}
+
+impl From<BuiltinFloat> for FloatTy {
+    fn from(t: BuiltinFloat) -> Self {
+        FloatTy { bitness: t.bitness }
+    }
+}
+
+impl From<Option<BuiltinInt>> for Uncertain<IntTy> {
+    fn from(t: Option<BuiltinInt>) -> Self {
+        match t {
+            None => Uncertain::Unknown,
+            Some(t) => Uncertain::Known(t.into()),
+        }
+    }
+}
+
+impl From<Option<BuiltinFloat>> for Uncertain<FloatTy> {
+    fn from(t: Option<BuiltinFloat>) -> Self {
+        match t {
+            None => Uncertain::Unknown,
+            Some(t) => Uncertain::Known(t.into()),
+        }
+    }
+}