refactor

Author: AsaiYusuke

constants.go

@@ -4,4 +4,9 @@ const (
 	msgErrorInvalidSyntaxUnrecognizedInput string = `unrecognized input`
 	msgErrorInvalidSyntaxTwoCurrentNode    string = `comparison between two current nodes is prohibited`
 	msgErrorInvalidSyntaxFilterValueGroup  string = `JSONPath that returns a value group is prohibited`
+
+	msgTypeNull          string = `null`
+	msgTypeObject        string = `object`
+	msgTypeArray         string = `array`
+	msgTypeObjectOrArray string = `object/array`
 )

syntax_node_identifier_child_multi.go

@@ -24,15 +24,15 @@ func (i *syntaxChildMultiIdentifier) retrieve(
 
 	srcMap, ok := current.(map[string]interface{})
 	if !ok {
-		foundType := `null`
+		foundType := msgTypeNull
 		if current != nil {
 			foundType = reflect.TypeOf(current).String()
 		}
 		return ErrorTypeUnmatched{
 			errorBasicRuntime: &errorBasicRuntime{
 				node: i.syntaxBasicNode,
 			},
-			expectedType: `object`,
+			expectedType: msgTypeObject,
 			foundType:    foundType,
 		}
 	}

syntax_node_identifier_child_single.go

@@ -13,15 +13,15 @@ func (i *syntaxChildSingleIdentifier) retrieve(
 
 	srcMap, ok := current.(map[string]interface{})
 	if !ok {
-		foundType := `null`
+		foundType := msgTypeNull
 		if current != nil {
 			foundType = reflect.TypeOf(current).String()
 		}
 		return ErrorTypeUnmatched{
 			errorBasicRuntime: &errorBasicRuntime{
 				node: i.syntaxBasicNode,
 			},
-			expectedType: `object`,
+			expectedType: msgTypeObject,
 			foundType:    foundType,
 		}
 	}

syntax_node_identifier_child_wildcard.go

@@ -21,15 +21,15 @@ func (i *syntaxChildWildcardIdentifier) retrieve(
 		deepestErrors = i.retrieveList(root, typedNodes, container, deepestErrors)
 
 	default:
-		foundType := `null`
+		foundType := msgTypeNull
 		if current != nil {
 			foundType = reflect.TypeOf(current).String()
 		}
 		return ErrorTypeUnmatched{
 			errorBasicRuntime: &errorBasicRuntime{
 				node: i.syntaxBasicNode,
 			},
-			expectedType: `object/array`,
+			expectedType: msgTypeObjectOrArray,
 			foundType:    foundType,
 		}
 	}

syntax_node_identifier_recursive_child.go

@@ -17,15 +17,15 @@ func (i *syntaxRecursiveChildIdentifier) retrieve(
 	switch current.(type) {
 	case map[string]interface{}, []interface{}:
 	default:
-		foundType := `null`
+		foundType := msgTypeNull
 		if current != nil {
 			foundType = reflect.TypeOf(current).String()
 		}
 		return ErrorTypeUnmatched{
 			errorBasicRuntime: &errorBasicRuntime{
 				node: i.syntaxBasicNode,
 			},
-			expectedType: `object/array`,
+			expectedType: msgTypeObjectOrArray,
 			foundType:    foundType,
 		}
 	}

syntax_node_qualifier_filter.go

@@ -21,15 +21,15 @@ func (f *syntaxFilterQualifier) retrieve(
 		deepestErrors = f.retrieveList(root, typedNodes, container, deepestErrors)
 
 	default:
-		foundType := `null`
+		foundType := msgTypeNull
 		if current != nil {
 			foundType = reflect.TypeOf(current).String()
 		}
 		return ErrorTypeUnmatched{
 			errorBasicRuntime: &errorBasicRuntime{
 				node: f.syntaxBasicNode,
 			},
-			expectedType: `object/array`,
+			expectedType: msgTypeObjectOrArray,
 			foundType:    foundType,
 		}
 	}

syntax_node_qualifier_union.go

@@ -13,15 +13,15 @@ func (u *syntaxUnionQualifier) retrieve(
 
 	srcArray, ok := current.([]interface{})
 	if !ok {
-		foundType := `null`
+		foundType := msgTypeNull
 		if current != nil {
 			foundType = reflect.TypeOf(current).String()
 		}
 		return ErrorTypeUnmatched{
 			errorBasicRuntime: &errorBasicRuntime{
 				node: u.syntaxBasicNode,
 			},
-			expectedType: `array`,
+			expectedType: msgTypeArray,
 			foundType:    foundType,
 		}
 	}