ast: make static an entity

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

src/ast.rs

@@ -12,6 +12,7 @@ pub enum Entity {
     Fn(Fn),
     Class(Class),
     Module(Module),
+    Static(Let)
 }
 
 /// A module just provides an additional scope

src/lexer.rs

@@ -136,8 +136,8 @@ pub struct Lexer<'a> {
     /// A peekable double ended queue for the tokens
     tokens: VecDeque<Token>,
     /// Current line number
-    pub line: usize,
+    pub(crate) line: usize,
-    pub col: usize,
+    pub(crate) col: usize,
     /// Start character index for the current token
     start: usize,
     /// End character index for the current token

src/parser/entity.rs

@@ -9,21 +9,22 @@ use crate::lexer::{
 use std::rc::Rc;
 
 impl<'a> Parser<'a> {
-    /// entity ::= module | class | fn
+    /// entity ::= module | class | fn | static
     pub(super) fn parse_entity(&mut self) -> Option<Entity> {
         use TokenKeyword::*;
         let token = self.peek_token();
 
         if let TokenKind::Keyword(keyword) = &token.kind {
-            match keyword {
+            Some(match keyword {
-                Module => Some(Entity::Module(self.parse_module()?)),
+                Module => Entity::Module(self.parse_module()?),
-                Class => Some(Entity::Class(self.parse_class()?)),
+                Class => Entity::Class(self.parse_class()?),
-                Fn => Some(Entity::Fn(self.parse_fn()?)),
+                Fn => Entity::Fn(self.parse_fn()?),
+                Static => Entity::Static(self.parse_static()?),
                 _ => {
                     self.error_expected_peek("entity");
-                    None
+                    return None;
-                }
                 }
+            })
         } else {
             self.error_expected_peek("entity");
             None