Start to correctly implmeent builtin functions

TODO.md

@@ -2,8 +2,6 @@
 
 ## Testing
 
-* Get a test library for running many unit tests working
-* Write a human-readable display of the AST
 * Make an automatic (macro-based?) system for numbering compiler errors, this should be every type of error
 
 ## Symbols
@@ -24,6 +22,10 @@
 
 2. Once FQSNs are aware of function parameters, most of the Rc<String> things in eval.rs can go away
 
+## Semantics
+
+* Use annotations to indicate builtin functions
+
 ## Parser
 * I think I can restructure the parser to get rid of most instances of expect!, at least at the beginning of a rule
 

schala-lang/language/src/builtin.rs

@@ -28,7 +28,6 @@ pub enum Builtin {
     GreaterThan,
     GreaterThanOrEqual,
     Comparison,
-    FieldAccess,
     IOPrint,
     IOPrintLn,
     IOGetLine,
@@ -59,7 +58,6 @@ impl Builtin {
             GreaterThan => ty!(Nat -> Nat -> Bool),
             GreaterThanOrEqual => ty!(Nat -> Nat -> Bool),
             Comparison => ty!(Nat -> Nat -> Ordering),
-            FieldAccess => ty!(Unit),
             IOPrint => ty!(Unit),
             IOPrintLn => ty!(Unit),
             IOGetLine => ty!(StringT),
@@ -120,7 +118,6 @@ impl FromStr for Builtin {
             "==" => Equality,
             "=" => Assignment,
             "<=>" => Comparison,
-            "." => FieldAccess,
             "print" => IOPrint,
             "println" => IOPrintLn,
             "getline" => IOGetLine,

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

@@ -310,6 +310,7 @@ impl<'a, 'b> Reducer<'a, 'b> {
         let def_id = symbol.def_id();
 
         match symbol.spec() {
+            Builtin(b) => Expression::Callable(Callable::Builtin(b)),
             Func => Expression::Lookup(Lookup::Function(def_id.unwrap())),
             GlobalBinding => Expression::Lookup(Lookup::GlobalVar(def_id.unwrap())),
             LocalVariable => Expression::Lookup(Lookup::LocalVar(def_id.unwrap())),

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

@@ -12,6 +12,7 @@ use crate::{
         Declaration, ItemId, ModuleSpecifier, Statement, StatementKind, TypeBody, TypeSingletonName, Variant,
         VariantKind,
     },
+    builtin::Builtin,
     tokenizing::Location,
     type_inference::{self, PendingType, TypeBuilder, TypeContext, TypeId, VariantBuilder},
 };
@@ -42,7 +43,6 @@ impl Fqsn {
         Fqsn { scopes: v }
     }
 
-    #[cfg(test)]
     fn from_strs(strs: &[&str]) -> Fqsn {
         let mut scopes = vec![];
         for s in strs {
@@ -152,7 +152,7 @@ pub struct SymbolTable {
 
 impl SymbolTable {
     pub fn new() -> SymbolTable {
-        SymbolTable {
+        let mut table = SymbolTable {
             def_id_store: IdStore::new(),
             symbol_trie: SymbolTrie::new(),
             fq_names: NameTable::new(),
@@ -161,7 +161,10 @@ impl SymbolTable {
             fqsn_to_symbol: HashMap::new(),
             id_to_symbol: HashMap::new(),
             def_to_symbol: HashMap::new(),
-        }
+        };
+
+        table.populate_builtins();
+        table
     }
 
     /// The main entry point into the symbol table. This will traverse the AST in several
@@ -209,6 +212,24 @@ impl SymbolTable {
         self.id_to_symbol.insert(*id, symbol.clone());
         self.def_to_symbol.insert(def_id, symbol);
     }
+
+    fn populate_single_builtin(&mut self, fqsn: Fqsn, builtin: Builtin) {
+        let def_id = self.def_id_store.fresh();
+        let spec = SymbolSpec::Builtin(builtin);
+        let symbol = Rc::new(Symbol { fully_qualified_name: fqsn.clone(), spec, def_id });
+
+        self.symbol_trie.insert(&fqsn);
+        self.fqsn_to_symbol.insert(fqsn, symbol.clone());
+        self.def_to_symbol.insert(def_id, symbol);
+    }
+
+    fn populate_builtins(&mut self) {
+        let fqsn = Fqsn::from_strs(&["println"]);
+        self.populate_single_builtin(fqsn, Builtin::IOPrintLn);
+
+        let fqsn = Fqsn::from_strs(&["print"]);
+        self.populate_single_builtin(fqsn, Builtin::IOPrint);
+    }
 }
 
 struct SymbolTableRunner<'a> {
@@ -258,6 +279,7 @@ impl fmt::Display for Symbol {
 //function parameters (even though they are currently assigned).
 #[derive(Debug, Clone)]
 pub enum SymbolSpec {
+    Builtin(Builtin),
     Func,
     DataConstructor { tag: u32, type_id: TypeId },
     RecordConstructor { tag: u32, members: HashMap<Rc<String>, TypeId>, type_id: TypeId },
@@ -270,6 +292,7 @@ impl fmt::Display for SymbolSpec {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         use self::SymbolSpec::*;
         match self {
+            Builtin(b) => write!(f, "Builtin: {:?}", b),
             Func => write!(f, "Func"),
             DataConstructor { tag, type_id } => write!(f, "DataConstructor(tag: {}, type: {})", tag, type_id),
             RecordConstructor { type_id, tag, .. } =>

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

@@ -276,16 +276,13 @@ impl<'a, 'b> Evaluator<'a, 'b> {
         let evaled_args = evaled_args?;
 
         Ok(match (builtin, evaled_args.as_slice()) {
-            (FieldAccess, /*&[Node::PrimObject { .. }]*/ _) => {
-                return Err("Field access unimplemented".into());
-            }
             /* builtin functions */
             (IOPrint, &[ref anything]) => {
                 print!("{}", anything.to_repl(self.type_context));
                 Primitive::Tuple(vec![])
             }
             (IOPrintLn, &[ref anything]) => {
-                print!("{}", anything.to_repl(self.type_context));
+                println!("{}", anything.to_repl(self.type_context));
                 Primitive::Tuple(vec![])
             }
             (IOGetLine, &[]) => {