implement basics of generics and generic checking

src/builtins/mod.rs

@@ -26,11 +26,12 @@ pub fn initialise_globals() -> GlobalNamespace {
     // def math add [ Numeric Numeric ] -> Numeric
     ns.register_command(
         CMD_ADD,
-        Some(TypeDef::List(vec![
-            TypeDef::Trait(numeric),
-            TypeDef::Trait(numeric),
+        vec![("T", vec![&numeric])],
+        Some(&TypeDef::List(vec![
+            TypeDef::Generic("T".to_owned()),
+            TypeDef::Generic("T".to_owned()),
         ])),
-        Some(TypeDef::Trait(numeric)),
+        Some(&TypeDef::Generic("T".to_owned())),
     )
     .unwrap();
 

src/globals.rs

@@ -0,0 +1,26 @@
+// concepts
+// root type namespace
+// -> builtin types/traits/functions
+// -> builtin constants
+//
+// generic item namespaces
+// -> in generic functions ( `add<T: Num> [ T T ] -> T` )
+// -> in generic types ( vec<T> )
+// -> generic traits ( T: From<E> )
+//
+// TODO: how builtins? just compile everything to builtin types/defs?
+
+/// This is the root type namespace.
+struct RootTypeNamespace {
+    
+}
+
+mod r#type {
+    
+}
+struct Type<'a> {
+    pub(super) id: usize,
+    pub(super) namespace: &'a GlobalNamespace,
+}
+
+struct InternalType

src/namespace/command.rs

@@ -1,8 +1,10 @@
+use std::collections::HashMap;
 use std::fmt::Debug;
 use std::fmt::Display;
 
 use super::typedef::{InternalTypeDef, TypeDef};
 use super::CommandId;
+use super::TraitId;
 
 use super::GlobalNamespace;
 
@@ -25,7 +27,7 @@ impl<'a> Command<'a> {
             .input
             .as_ref()
             .map(|inputs| match inputs {
-                InternalTypeDef::Single(_) => 1,
+                InternalTypeDef::Single(_) | InternalTypeDef::Generic(_) => 1,
                 InternalTypeDef::List(list) => list.len(),
                 InternalTypeDef::Record(rec) => rec.len(),
             })
@@ -68,5 +70,4 @@ pub(super) struct InternalCommand {
     // gosh this is hacky
     pub(super) input: Option<InternalTypeDef>,
     pub(super) output: Option<InternalTypeDef>,
-    // generic_ns: HashMap<String, Vec<usize>>,
 }

src/namespace/mod.rs

@@ -102,15 +102,37 @@ impl GlobalNamespace {
     /// # Errors
     ///
     /// Will return `NsRegistrationError::NameAlreadyExists` if the desired name is already in use
-    pub fn register_command(
+    pub fn register_command<'a>(
         &self,
-        name: &str,
-        input: Option<TypeDef>,
-        output: Option<TypeDef>,
-    ) -> Result<Command, NsRegistrationError> {
+        name: &'a str,
+        // TODO: refacto with builder pattern maybe?
+        generics: Vec<(&'a str, Vec<&Trait>)>,
+        input: Option<&'a TypeDef>,
+        output: Option<&'a TypeDef>,
+    ) -> Result<Command, NsRegistrationError<'a>> {
         if self.data_namespace.borrow().contains_key(name) {
             Err(NsRegistrationError::NameAlreadyExists)
         } else {
+            let mut internal_generics_namespace: HashMap<String, Vec<TraitId>> = HashMap::new();
+
+            for (name, conditions) in generics {
+                if internal_generics_namespace.contains_key(name) {
+                    return Err(NsRegistrationError::GenericNameAlreadyExists);
+                }
+                internal_generics_namespace
+                    .insert(name.to_string(), conditions.iter().map(|t| t.id).collect());
+            }
+
+            if let Some(def) = input {
+                def.check_generics_exist(&internal_generics_namespace)
+                    .map_err(NsRegistrationError::UnregisteredGenericsUsed)?;
+            }
+
+            if let Some(def) = output {
+                def.check_generics_exist(&internal_generics_namespace)
+                    .map_err(NsRegistrationError::UnregisteredGenericsUsed)?;
+            }
+
             self.commands.borrow_mut().push(InternalCommand {
                 name: name.to_owned(),
                 input: input.map(std::convert::Into::into),
@@ -184,6 +206,8 @@ impl GlobalNamespace {
 }
 
 #[derive(Debug)]
-pub enum NsRegistrationError {
+pub enum NsRegistrationError<'a> {
     NameAlreadyExists,
+    GenericNameAlreadyExists,
+    UnregisteredGenericsUsed(Vec<&'a str>),
 }

src/namespace/typedef.rs

@@ -1,6 +1,9 @@
+use std::collections::HashMap;
 use std::fmt::Debug;
 use std::fmt::Display;
 
+use super::TraitId;
+use super::TypeId;
 use super::TypeNamespaceId;
 
 use super::GlobalNamespace;
@@ -10,25 +13,76 @@ use super::r#type::Type;
 
 pub enum TypeDef<'a> {
     Type(Type<'a>),
-    Trait(Trait<'a>),
+    Generic(String),
     List(Vec<TypeDef<'a>>),
     Record(Vec<(String, TypeDef<'a>)>),
 }
 
 impl<'a> TypeDef<'a> {
+    pub(super) fn check_generics_exist(
+        &'a self,
+        map: &HashMap<String, Vec<TraitId>>,
+    ) -> Result<(), Vec<&'a str>> {
+        match self {
+            TypeDef::Type(_) => Ok(()),
+            TypeDef::Generic(name) => {
+                if map.contains_key(name) {
+                    Ok(())
+                } else {
+                    Err(vec![name])
+                }
+            }
+            TypeDef::List(defs) => {
+                let r = defs
+                    .into_iter()
+                    .map(|def| def.check_generics_exist(map))
+                    .filter_map(|check_res| {
+                        if let Err(invalid_names) = check_res {
+                            Some(invalid_names)
+                        } else {
+                            None
+                        }
+                    })
+                    .reduce(|mut acc, mut errs| {
+                        acc.append(&mut errs);
+                        acc
+                    });
+
+                match r {
+                    Some(e) => Err(e),
+                    None => Ok(()),
+                }
+            }
+            TypeDef::Record(rec) => {
+                let r = rec
+                    .into_iter()
+                    .map(|(n, def)| def.check_generics_exist(map))
+                    .filter_map(|check_res| {
+                        if let Err(invalid_names) = check_res {
+                            Some(invalid_names)
+                        } else {
+                            None
+                        }
+                    })
+                    .reduce(|mut acc, mut errs| {
+                        acc.append(&mut errs);
+                        acc
+                    });
+
+                match r {
+                    Some(e) => Err(e),
+                    None => Ok(()),
+                }
+            }
+        }
+    }
     pub(super) fn from_internal(ns: &'a GlobalNamespace, def: &InternalTypeDef) -> TypeDef<'a> {
         match def {
-            InternalTypeDef::Single(id) => match id {
-                // safe to unwrap because this is only used with internal representations
-                TypeNamespaceId::Types(id) => TypeDef::Type(
-                    ns.get_type(*id)
-                        .expect("Incorrect internal type id. This is a bug."),
-                ),
-                TypeNamespaceId::Traits(id) => TypeDef::Trait(
-                    ns.get_trait(*id)
-                        .expect("Incorrect internal trait id. This is a bug."),
-                ),
-            },
+            InternalTypeDef::Single(id) => TypeDef::Type(
+                ns.get_type(*id)
+                    .expect("Unregistered internal type ID. This is a bug."),
+            ),
+            InternalTypeDef::Generic(name) => TypeDef::Generic(name.clone()),
             InternalTypeDef::List(list) => TypeDef::List(
                 list.iter()
                     .map(|def| Self::from_internal(ns, def))
@@ -47,13 +101,14 @@ impl Display for TypeDef<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             TypeDef::Type(t) => Display::fmt(&t, f),
-            TypeDef::Trait(t) => Display::fmt(&t, f),
+            TypeDef::Generic(name) => Display::fmt(name, f),
             TypeDef::List(l) => {
                 f.write_str("[ ")?;
-                for (i, item) in l.iter().enumerate() {
-                    if i != 0 {
-                        f.write_str(", ")?;
-                    }
+                if let Some(first) = l.first() {
+                    Display::fmt(&first, f)?;
+                }
+                for (i, item) in l.iter().skip(1).enumerate() {
+                    f.write_str(", ")?;
                     Display::fmt(&item, f)?;
                 }
                 f.write_str(" ]")
@@ -76,7 +131,7 @@ impl Debug for TypeDef<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
             TypeDef::Type(t) => Debug::fmt(&t, f),
-            TypeDef::Trait(t) => Debug::fmt(&t, f),
+            TypeDef::Generic(name) => Debug::fmt(name, f),
             TypeDef::List(l) => {
                 f.write_str("[ ")?;
                 for (i, item) in l.iter().enumerate() {
@@ -107,29 +162,25 @@ impl<'a> From<Type<'a>> for TypeDef<'a> {
     }
 }
 
-impl<'a> From<Trait<'a>> for TypeDef<'a> {
-    fn from(value: Trait<'a>) -> Self {
-        TypeDef::Trait(value)
-    }
-}
-
 pub(super) enum InternalTypeDef {
-    Single(TypeNamespaceId),
+    Single(TypeId),
+    Generic(String),
     List(Vec<InternalTypeDef>),
     Record(Vec<(String, InternalTypeDef)>),
 }
 
-impl From<TypeDef<'_>> for InternalTypeDef {
-    fn from(value: TypeDef) -> Self {
+impl From<&TypeDef<'_>> for InternalTypeDef {
+    fn from(value: &TypeDef) -> Self {
         match value {
-            TypeDef::Type(val) => Self::Single(TypeNamespaceId::Types(val.id)),
-            TypeDef::Trait(val) => Self::Single(TypeNamespaceId::Traits(val.id)),
+            TypeDef::Type(val) => Self::Single(val.id),
+            // TODO: rewrite this to be better
+            TypeDef::Generic(name) => Self::Generic(name.to_owned()),
             TypeDef::List(list) => {
                 Self::List(list.into_iter().map(std::convert::Into::into).collect())
             }
             TypeDef::Record(rec) => Self::Record(
                 rec.into_iter()
-                    .map(|(name, typ)| (name, typ.into()))
+                    .map(|(name, typ)| (name.to_owned(), typ.into()))
                     .collect(),
             ),
         }

src/typed.rs

@@ -195,7 +195,7 @@ impl<'a> ConcreteTypeDef<'a> {
     fn try_from_typedef(val: &TypeDef<'a>) -> Option<Self> {
         match val {
             TypeDef::Type(typ) => Some(Self::Single(*typ)),
-            TypeDef::Trait(_) => None,
+            TypeDef::Generic(_) => todo!(),
             TypeDef::List(list) => {
                 let out: Vec<ConcreteTypeDef<'a>> =
                     list.iter().filter_map(Self::try_from_typedef).collect();