feat: extract code for compiling equal operator (#614)

Author: zhuliquan

compiler/compiler.go

@@ -395,34 +395,12 @@ func (c *compiler) UnaryNode(node *ast.UnaryNode) {
 }
 
 func (c *compiler) BinaryNode(node *ast.BinaryNode) {
-	l := kind(node.Left)
-	r := kind(node.Right)
-
-	leftIsSimple := isSimpleType(node.Left)
-	rightIsSimple := isSimpleType(node.Right)
-	leftAndRightAreSimple := leftIsSimple && rightIsSimple
-
 	switch node.Operator {
 	case "==":
-		c.compile(node.Left)
-		c.derefInNeeded(node.Left)
-		c.compile(node.Right)
-		c.derefInNeeded(node.Right)
-
-		if l == r && l == reflect.Int && leftAndRightAreSimple {
-			c.emit(OpEqualInt)
-		} else if l == r && l == reflect.String && leftAndRightAreSimple {
-			c.emit(OpEqualString)
-		} else {
-			c.emit(OpEqual)
-		}
+		c.equalBinaryNode(node)
 
 	case "!=":
-		c.compile(node.Left)
-		c.derefInNeeded(node.Left)
-		c.compile(node.Right)
-		c.derefInNeeded(node.Right)
-		c.emit(OpEqual)
+		c.equalBinaryNode(node)
 		c.emit(OpNot)
 
 	case "or", "||":
@@ -580,6 +558,28 @@ func (c *compiler) BinaryNode(node *ast.BinaryNode) {
 	}
 }
 
+func (c *compiler) equalBinaryNode(node *ast.BinaryNode) {
+	l := kind(node.Left)
+	r := kind(node.Right)
+
+	leftIsSimple := isSimpleType(node.Left)
+	rightIsSimple := isSimpleType(node.Right)
+	leftAndRightAreSimple := leftIsSimple && rightIsSimple
+
+	c.compile(node.Left)
+	c.derefInNeeded(node.Left)
+	c.compile(node.Right)
+	c.derefInNeeded(node.Right)
+
+	if l == r && l == reflect.Int && leftAndRightAreSimple {
+		c.emit(OpEqualInt)
+	} else if l == r && l == reflect.String && leftAndRightAreSimple {
+		c.emit(OpEqualString)
+	} else {
+		c.emit(OpEqual)
+	}
+}
+
 func isSimpleType(node ast.Node) bool {
 	if node == nil {
 		return false