Handle HalfExpr closer to correct

schala-lang/language/src/builtin.rs

@@ -79,6 +79,15 @@ impl BinOp {
       default
     }))
   }
+
+  pub fn get_precedence(&self) -> i32 {
+    let s: &str = &self.sigil;
+    let default = 10_000_000;
+    BINOPS.get(s).map(|x| x.2.clone()).unwrap_or_else(|| {
+      println!("Warning: operator {} not defined", s);
+      default
+    })
+  }
 }
 
 #[derive(Debug, PartialEq, Clone)]

schala-lang/language/src/parsing.rs

@@ -744,11 +744,13 @@ impl Parser {
       },
       ref tok if BinOp::from_sigil_token(tok).is_some() => {
         let op = BinOp::from_sigil_token(&self.next()).unwrap();
-        let Expression(expr, _) = self.expression()?;
+        let precedence = op.get_precedence();
+        let Expression(expr, _) = self.precedence_expr(precedence)?;
         Guard::HalfExpr(HalfExpr { op: Some(op), expr })
       },
-      _ => {
-        let Expression(expr, _) = self.expression()?;
+      x => {
+        //TODO - I think there's a better way to do this involving the precedence of ->
+        let Expression(expr, _) = self.prefix_expr()?;
         Guard::HalfExpr(HalfExpr { op: None, expr })
       }
     })

schala-lang/language/src/reduced_ast.rs

@@ -171,15 +171,19 @@ fn reduce_if_expression(discriminator: &Discriminator, body: &IfExpressionBody,
       }
     },
     IfExpressionBody::GuardList(ref guard_arms) => {
-      let alternatives = guard_arms.iter().map(|arm| match arm.guard {
-        Guard::Pat(ref p) =>  {
-          let item = arm.body.iter().map(|expr| expr.reduce(symbol_table)).collect();
-          p.to_alternative(&cond, item, symbol_table)
-        },
-        Guard::HalfExpr(HalfExpr { op: _, expr: _ }) => {
-          unimplemented!()
+      let mut alternatives = vec![];
+      for arm in guard_arms {
+        match arm.guard {
+          Guard::Pat(ref p) =>  {
+            let item = arm.body.iter().map(|expr| expr.reduce(symbol_table)).collect();
+            let alt = p.to_alternative(&cond, item, symbol_table);
+            alternatives.push(alt);
+          },
+          Guard::HalfExpr(HalfExpr { op: _, expr: _ }) => {
+            return Expr::UnimplementedSigilValue
+          }
         }
-      }).collect();
+      }
       Expr::CaseMatch { cond, alternatives }
     }
   }