Fix printing on conditional/binary nodes

Fixes #613

Author: antonmedv

ast/print.go

@@ -65,8 +65,7 @@ func (n *BinaryNode) String() string {
 	var lhs, rhs string
 	var lwrap, rwrap bool
 
-	lb, ok := n.Left.(*BinaryNode)
-	if ok {
+	if lb, ok := n.Left.(*BinaryNode); ok {
 		if operator.Less(lb.Operator, n.Operator) {
 			lwrap = true
 		}
@@ -77,9 +76,7 @@ func (n *BinaryNode) String() string {
 			lwrap = true
 		}
 	}
-
-	rb, ok := n.Right.(*BinaryNode)
-	if ok {
+	if rb, ok := n.Right.(*BinaryNode); ok {
 		if operator.Less(rb.Operator, n.Operator) {
 			rwrap = true
 		}
@@ -88,6 +85,13 @@ func (n *BinaryNode) String() string {
 		}
 	}
 
+	if _, ok := n.Left.(*ConditionalNode); ok {
+		lwrap = true
+	}
+	if _, ok := n.Right.(*ConditionalNode); ok {
+		rwrap = true
+	}
+
 	if lwrap {
 		lhs = fmt.Sprintf("(%s)", n.Left.String())
 	} else {
@@ -108,20 +112,25 @@ func (n *ChainNode) String() string {
 }
 
 func (n *MemberNode) String() string {
+	node := n.Node.String()
+	if _, ok := n.Node.(*BinaryNode); ok {
+		node = fmt.Sprintf("(%s)", node)
+	}
+
 	if n.Optional {
 		if str, ok := n.Property.(*StringNode); ok && utils.IsValidIdentifier(str.Value) {
-			return fmt.Sprintf("%s?.%s", n.Node.String(), str.Value)
+			return fmt.Sprintf("%s?.%s", node, str.Value)
 		} else {
-			return fmt.Sprintf("%s?.[%s]", n.Node.String(), n.Property.String())
+			return fmt.Sprintf("%s?.[%s]", node, n.Property.String())
 		}
 	}
 	if str, ok := n.Property.(*StringNode); ok && utils.IsValidIdentifier(str.Value) {
 		if _, ok := n.Node.(*PointerNode); ok {
 			return fmt.Sprintf(".%s", str.Value)
 		}
-		return fmt.Sprintf("%s.%s", n.Node.String(), str.Value)
+		return fmt.Sprintf("%s.%s", node, str.Value)
 	}
-	return fmt.Sprintf("%s[%s]", n.Node.String(), n.Property.String())
+	return fmt.Sprintf("%s[%s]", node, n.Property.String())
 }
 
 func (n *SliceNode) String() string {

ast/print_test.go

@@ -72,6 +72,7 @@ func TestPrint(t *testing.T) {
 		{`a[:]`, `a[:]`},
 		{`(nil ?? 1) > 0`, `(nil ?? 1) > 0`},
 		{`{("a" + "b"): 42}`, `{("a" + "b"): 42}`},
+		{`(One == 1 ? true : false) && Two == 2`, `(One == 1 ? true : false) && Two == 2`},
 	}
 
 	for _, tt := range tests {

expr_test.go

@@ -1298,6 +1298,15 @@ func TestExpr(t *testing.T) {
 				require.NoError(t, err, "eval")
 				assert.Equal(t, tt.want, got, "eval")
 			}
+			{
+				program, err := expr.Compile(tt.code, expr.Env(mock.Env{}), expr.Optimize(false))
+				require.NoError(t, err)
+
+				code := program.Node().String()
+				got, err := expr.Eval(code, env)
+				require.NoError(t, err, code)
+				assert.Equal(t, tt.want, got, code)
+			}
 		})
 	}
 }