Feat: Posicional only parameters for functions.

Author: dylan-sutton-chavez

compiler/src/modules/parser.rs

@@ -1568,6 +1568,10 @@ impl<'src, I: Iterator<Item = Token>> Parser<'src, I> {
         let mut params = Vec::new();
         let mut defaults = 0u16;
         while !matches!(self.peek(), Some(TokenType::Rpar) | None) {
+            if self.eat_if(TokenType::Slash) {
+                if matches!(self.peek(), Some(TokenType::Comma)) { self.advance(); }
+                continue;
+            }
             if self.eat_if(TokenType::Star) {
                 let p = self.advance();
                 params.push(format!("*{}", self.lexeme(&p)));

compiler/tests/cases/parser_cases.json

@@ -1142,5 +1142,21 @@
     "names": ["f_0"], 
     "instructions": [["LoadName",0], ["Call",0], ["Await",0], ["PopTop",0], ["ReturnValue",0]], 
     "annotations": {}
+  },
+  {
+    "src": "def f(a, b, /, c):\n    pass", 
+    "constants": [], 
+    "names": ["f_1"], 
+    "instructions": [["MakeFunction",0], ["StoreName",0], ["ReturnValue",0]], 
+    "annotations": {}, 
+    "functions": 1
+  },
+  {
+    "src": "def f(a, /, b, *, c):\n    pass", 
+    "constants": [], 
+    "names": ["f_1"], 
+    "instructions": [["MakeFunction",0], ["StoreName",0], ["ReturnValue",0]], 
+    "annotations": {}, 
+    "functions": 1
   }
 ]