Simplified expression evaluation

src/core/EvaluateCall.go

@@ -1,26 +1,22 @@
 package core
 
 import (
-	"git.urbach.dev/cli/q/src/errors"
 	"git.urbach.dev/cli/q/src/eval"
 	"git.urbach.dev/cli/q/src/expression"
 )
 
 // EvaluateCall evaluates a function call.
-func (f *Function) EvaluateCall(expr *expression.Expression) (eval.Value, error) {
-	types, err := f.CompileCall(expr)
+func (f *Function) EvaluateCall(expr *expression.Expression) (eval.Register, error) {
+	typ, err := f.CompileCall(expr)
 
 	if err != nil {
-		return nil, err
+		return eval.Register{}, err
 	}
 
-	if len(types) == 0 {
-		return nil, errors.New(errors.UntypedExpression, f.File, expr.Token.Position)
-	}
+	value := eval.Register{Register: f.CPU.Output[0]}
 
-	value := eval.Register{
-		Typ:      types[0],
-		Register: f.CPU.Output[0],
+	if len(typ) > 0 {
+		value.Typ = typ[0]
 	}
 
 	return value, nil