added let, about to add types

src/types.rs

@@ -0,0 +1,75 @@
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub enum Signedness {
+    Signed,
+    Unsigned,
+}
+
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub enum IntBitness {
+    X8,
+    X16,
+    X32,
+    X64,
+    X128,
+}
+
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Hash)]
+pub enum FloatBitness {
+    X32,
+    X64,
+    X128,
+}
+
+
+#[derive(Clone, Eq, PartialEq, Hash)]
+pub struct IntTypeDef {
+    pub signedness: Signedness,
+    pub bitness: IntBitness,
+}
+
+
+#[derive(Clone, PartialEq, Eq, Hash)]
+pub struct FloatTypeDef {
+    pub bitness: FloatBitness,
+}
+
+#[derive(Clone, PartialEq, Eq, Hash)]
+pub struct FunctionTypeDef {
+    pub arguments: Vec<Type>,
+    pub return_type: Box<Type>,
+}
+
+
+#[derive(Clone, PartialEq, Eq, Hash)]
+pub enum Type {
+    Bool,
+    Int(IntTypeDef),
+    Float(FloatTypeDef),
+    Function(FunctionTypeDef),
+    // String(StringTypeDef),
+    // Struct(StructTypeDef),
+    // Trait(TraitTypeDef),
+    // Void,
+    // Never,
+}
+
+
+/// Used for places where type info may or may not be solved.
+#[derive(Clone, Eq, PartialEq, Hash)]
+pub enum SpecifiedType {
+    Unknown,
+    Type(Type),
+}
+
+
+// Env table
+// name => ast_id
+//
+// Type Table
+// ast_id => type_id
+//
+//
+// TypeDef Table
+// type_id => type_def