Move minimal typechecking code into directory-style module

schala-lang/language/src/builtin.rs

@@ -1,8 +1,9 @@
-use std::str::FromStr;
-use std::convert::TryFrom;
+use std::{convert::TryFrom, str::FromStr};
 
-use crate::typechecking::{TypeConst, Type};
-use crate::ast::{BinOp, PrefixOp};
+use crate::{
+    ast::{BinOp, PrefixOp},
+    type_inference::Type,
+};
 
 /// "Builtin" computational operations with some kind of semantics, mostly mathematical operations.
 #[derive(Debug, Clone, Copy, PartialEq)]
@@ -36,6 +37,7 @@ pub enum Builtin {
 }
 
 impl Builtin {
+    #[allow(dead_code)]
     pub fn get_type(&self) -> Type {
         use Builtin::*;
         match self {
@@ -64,7 +66,7 @@ impl Builtin {
             Assignment => ty!(Unit),
             Concatenate => ty!(StringT -> StringT -> StringT),
             Increment => ty!(Nat -> Int),
-      Negate => ty!(Nat -> Int)
+            Negate => ty!(Nat -> Int),
         }
     }
 }
@@ -87,7 +89,7 @@ impl TryFrom<&PrefixOp> for Builtin {
             "+" => Ok(Increment),
             "-" => Ok(Negate),
             "!" => Ok(BooleanNot),
-      _ => Err(())
+            _ => Err(()),
         }
     }
 }
@@ -122,7 +124,7 @@ impl FromStr for Builtin {
             "print" => IOPrint,
             "println" => IOPrintLn,
             "getline" => IOGetLine,
-      _ => return Err(())
+            _ => return Err(()),
         })
     }
 }

schala-lang/language/src/error.rs

@@ -2,7 +2,7 @@ use crate::parsing::ParseError;
 use crate::schala::{SourceReference, Stage};
 use crate::tokenizing::{Location, Token, TokenKind};
 use crate::symbol_table::SymbolError;
-use crate::typechecking::TypeError;
+use crate::type_inference::TypeError;
 
 pub struct SchalaError {
     errors: Vec<Error>,
@@ -19,6 +19,7 @@ impl SchalaError {
         }
     }
 
+    #[allow(dead_code)]
     pub(crate) fn from_type_error(err: TypeError) -> Self {
         Self {
             formatted_parse_error: None,

schala-lang/language/src/lib.rs

@@ -13,8 +13,9 @@ extern crate derivative;
 
 #[macro_use]
 mod util;
+
 #[macro_use]
-mod typechecking;
+mod type_inference;
 
 mod ast;
 mod parsing;

schala-lang/language/src/reduced_ir/types.rs

@@ -4,7 +4,7 @@ use std::convert::From;
 
 use crate::builtin::Builtin;
 use crate::symbol_table::{DefId, SymbolTable};
-use crate::typechecking::TypeId;
+use crate::type_inference::TypeId;
 
 //TODO most of these Clone impls only exist to support function application, because the
 //tree-walking evaluator moves the reduced IR members.

schala-lang/language/src/schala.rs

@@ -5,7 +5,7 @@ use schala_repl::{
 use stopwatch::Stopwatch;
 
 use crate::{
-    error::SchalaError, parsing, reduced_ir, symbol_table, tokenizing, tree_walk_eval, typechecking,
+    error::SchalaError, parsing, reduced_ir, symbol_table, tokenizing, tree_walk_eval, type_inference,
 };
 
 /// All the state necessary to parse and execute a Schala program are stored in this struct.
@@ -17,7 +17,7 @@ pub struct Schala<'a> {
     /// Keeps track of symbols and scopes
     symbol_table: symbol_table::SymbolTable,
     /// Contains information for type-checking
-    type_context: typechecking::TypeContext<'static>,
+    type_context: type_inference::TypeContext,
     /// Schala Parser
     active_parser: parsing::Parser,
 
@@ -44,8 +44,7 @@ impl<'a> Schala<'a> {
         Schala {
             source_reference: SourceReference::new(),
             symbol_table: symbol_table::SymbolTable::new(),
-            //state: eval::State::new(),
-            type_context: typechecking::TypeContext::new(),
+            type_context: type_inference::TypeContext::new(),
             active_parser: parsing::Parser::new(),
             eval_state: tree_walk_eval::State::new(),
         }
@@ -88,7 +87,7 @@ impl<'a> Schala<'a> {
 
         // Typechecking
         // TODO typechecking not working
-        let _overall_type = self.type_context.typecheck(&ast).map_err(SchalaError::from_type_error);
+        //let _overall_type = self.type_context.typecheck(&ast).map_err(SchalaError::from_type_error);
 
         let reduced_ir = reduced_ir::reduce(&ast, &self.symbol_table);
 

schala-lang/language/src/symbol_table/mod.rs

@@ -8,7 +8,7 @@ use crate::ast::{
     Variant, VariantKind,
 };
 use crate::tokenizing::Location;
-use crate::typechecking::TypeId;
+use crate::type_inference::TypeId;
 
 mod resolver;
 mod symbol_trie;

schala-lang/language/src/tree_walk_eval/mod.rs

@@ -6,7 +6,7 @@ use crate::{
         Alternative, Callable, Expression, FunctionDefinition, Literal, Lookup, Pattern, ReducedIR, Statement,
     },
     symbol_table::DefId,
-    typechecking::TypeId,
+    type_inference::TypeId,
     util::ScopeStack,
 };
 

schala-lang/language/src/type_inference/mod.rs

@@ -0,0 +1,73 @@
+use std::{fmt, rc::Rc};
+
+//TODO need to hook this into the actual typechecking system somehow
+#[derive(Debug, Clone)]
+pub struct TypeId {
+    local_name: Rc<String>,
+}
+
+impl fmt::Display for TypeId {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "TypeId:{}", self.local_name())
+    }
+}
+
+impl TypeId {
+    //TODO this is definitely incomplete
+    pub fn lookup_name(name: &str) -> TypeId {
+        TypeId { local_name: Rc::new(name.to_string()) }
+    }
+
+    pub fn local_name(&self) -> &str {
+        self.local_name.as_ref()
+    }
+}
+
+pub struct TypeContext;
+
+impl TypeContext {
+    pub fn new() -> Self {
+        Self
+    }
+}
+
+#[derive(Debug, Clone)]
+pub struct TypeError {
+    pub msg: String,
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum TypeConst {
+    Unit,
+    Nat,
+    Int,
+    Float,
+    StringT,
+    Bool,
+    Ordering,
+}
+
+#[allow(dead_code)]
+#[derive(Debug, Clone, PartialEq)]
+pub enum Type {
+    Const(TypeConst),
+    //Var(TypeVar),
+    Arrow { params: Vec<Type>, ret: Box<Type> },
+    Compound { ty_name: String, args: Vec<Type> },
+}
+
+macro_rules! ty {
+    ($type_name:ident) => {
+        Type::Const(crate::type_inference::TypeConst::$type_name)
+    };
+    ($t1:ident -> $t2:ident) => {
+        Type::Arrow { params: vec![ty!($t1)], ret: box ty!($t2) }
+    };
+    ($t1:ident -> $t2:ident -> $t3:ident) => {
+        Type::Arrow { params: vec![ty!($t1), ty!($t2)], ret: box ty!($t3) }
+    };
+    ($type_list:ident, $ret_type:ident) => {
+        Type::Arrow { params: $type_list, ret: box $ret_type }
+    };
+}

schala-lang/language/src/util.rs

@@ -1,8 +1,4 @@
-use std::{cmp::Eq, collections::HashMap, hash::Hash, ops::Deref};
-
-pub fn deref_optional_box<T>(x: &Option<Box<T>>) -> Option<&T> {
-    x.as_ref().map(Deref::deref)
-}
+use std::{cmp::Eq, collections::HashMap, hash::Hash};
 
 #[derive(Default, Debug)]
 pub struct ScopeStack<'a, T: 'a, V: 'a, N = String>