Fix bug where keyNode is nil

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
   - repo: https://github.com/losisin/helm-values-schema-json
-    rev: v1.0.0
+    rev: v1.1.0
     hooks:
       - id: helm-schema
         args:

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2023 Aleksandar Stojanov
+Copyright (c) 2023 - 2024 Aleksandar Stojanov
 
 Permission is hereby granted, free of charge, to any person obtaining
 a copy of this software and associated documentation files (the

README.md

@@ -57,7 +57,7 @@ First [install pre-commit](https://pre-commit.com/#install) and then create or u
 ```yaml
 repos:
   - repo: https://github.com/losisin/helm-values-schema-json
-    rev: v1.0.0
+    rev: v1.1.0
     hooks:
       - id: helm-schema
         args: ["-input", "values.yaml"]

docs/README.md

@@ -70,6 +70,42 @@ replicaCount: # @schema type:[integer, null]
 }
 ```
 
+Another way to use this is to define type when using anchors and aliases in yaml. See discussion [#28](https://github.com/losisin/helm-values-schema-json/issues/28) for more details.
+
+```yaml
+app: &app
+  settings:
+    namespace:
+      - *app # @schema type:[string]
+```
+
+```json
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "properties": {
+        "app": {
+            "properties": {
+                "settings": {
+                    "properties": {
+                        "namespace": {
+                            "items": {
+                                "type": [
+                                    "string"
+                                ]
+                            },
+                            "type": "array"
+                        }
+                    },
+                    "type": "object"
+                }
+            },
+            "type": "object"
+        }
+    },
+    "type": "object"
+}
+```
+
 ### Enum
 
 Always returns array of strings. Special case is `null` where instead of string, it is treated as valid inpput type.  [section 6.1.2](https://json-schema.org/draft/2020-12/json-schema-validation#section-6.1.2)

pkg/schema.go

@@ -68,10 +68,13 @@ func getSchemaURL(draft int) (string, error) {
 }
 
 func getComment(keyNode *yaml.Node, valNode *yaml.Node) string {
-	if len(valNode.Value) > 0 {
+	if valNode.LineComment != "" {
 		return valNode.LineComment
 	}
-	return keyNode.LineComment
+	if keyNode != nil {
+		return keyNode.LineComment
+	}
+	return ""
 }
 
 func processList(comment string, stringsOnly bool) []interface{} {
@@ -102,8 +105,6 @@ func processComment(schema *Schema, comment string) (isRequired bool) {
 			value := strings.TrimSpace(keyValue[1])
 
 			switch key {
-			case "type":
-				schema.Type = processList(value, true)
 			case "enum":
 				schema.Enum = processList(value, false)
 			case "multipleOf":
@@ -154,6 +155,8 @@ func processComment(schema *Schema, comment string) (isRequired bool) {
 				if strings.TrimSpace(value) == "true" {
 					isRequired = strings.TrimSpace(value) == "true"
 				}
+			case "type":
+				schema.Type = processList(value, true)
 			}
 		}
 	}
@@ -200,10 +203,7 @@ func parseNode(keyNode *yaml.Node, valNode *yaml.Node) (*Schema, bool) {
 		}
 	}
 
-	propIsRequired := false
-	if keyNode != nil {
-		propIsRequired = processComment(schema, getComment(keyNode, valNode))
-	}
+	propIsRequired := processComment(schema, getComment(keyNode, valNode))
 
 	return schema, propIsRequired
 }

pkg/schema_test.go

@@ -161,7 +161,7 @@ func TestGetComment(t *testing.T) {
 				Value:       "some value",
 				LineComment: "",
 			},
-			expectedComment: "",
+			expectedComment: "# Key comment",
 		},
 		{
 			name: "empty value node, key node with comment",

plugin.yaml

@@ -1,5 +1,5 @@
 name: "schema"
-version: "1.0.0"
+version: "1.1.0"
 usage: "generate values.schema.json from values yaml"
 description: "Helm plugin for generating values.schema.json from multiple values files."
 ignoreFlags: false

testdata/anchors.schema.json

@@ -0,0 +1,24 @@
+{
+    "$schema": "https://json-schema.org/draft/2020-12/schema",
+    "properties": {
+        "app": {
+            "properties": {
+                "settings": {
+                    "properties": {
+                        "namespace": {
+                            "items": {
+                                "type": [
+                                    "string"
+                                ]
+                            },
+                            "type": "array"
+                        }
+                    },
+                    "type": "object"
+                }
+            },
+            "type": "object"
+        }
+    },
+    "type": "object"
+}

testdata/anchors.yaml

@@ -0,0 +1,4 @@
+app: &app
+  settings:
+    namespace:
+      - *app # @schema type:[string]