feat: Added more JSON Path Plus support for spectral specifics.

pkg/jsonpath/jsonpath_plus_test.go

@@ -1347,3 +1347,159 @@ func contains(s, substr string) bool {
 	}
 	return false
 }
+
+func TestUnquotedBracketNotation(t *testing.T) {
+	tests := []struct {
+		name     string
+		yaml     string
+		path     string
+		expected int
+	}{
+		{
+			name: "select GET operations with unquoted bracket",
+			yaml: `
+paths:
+  /users:
+    get:
+      operationId: "getUsers"
+    post:
+      operationId: "createUser"
+  /items:
+    get:
+      operationId: "getItems"
+    delete:
+      operationId: "deleteItems"
+`,
+			path:     `$.paths[*][get]`,
+			expected: 2,
+		},
+		{
+			name: "union of unquoted bracket selectors",
+			yaml: `
+paths:
+  /users:
+    get:
+      operationId: "getUsers"
+    post:
+      operationId: "createUser"
+    delete:
+      operationId: "deleteUsers"
+  /items:
+    get:
+      operationId: "getItems"
+    put:
+      operationId: "updateItems"
+`,
+			path:     `$.paths[*][get,post]`,
+			expected: 3,
+		},
+		{
+			name: "media type selector",
+			yaml: `
+paths:
+  /users:
+    post:
+      requestBody:
+        content:
+          application/vnd.api+json:
+            schema:
+              type: object
+          application/json:
+            schema:
+              type: object
+`,
+			path:     `$.paths..content[application/vnd.api+json].schema`,
+			expected: 1,
+		},
+		{
+			name: "mixed name and integer selectors on mapping",
+			yaml: `
+responses:
+  default:
+    description: "Default error"
+  "200":
+    description: "Success"
+  "400":
+    description: "Bad request"
+  "500":
+    description: "Server error"
+`,
+			path:     `$.responses[default,400,500]`,
+			expected: 3,
+		},
+		{
+			name: "integer index on mapping node (200 status code)",
+			yaml: `
+responses:
+  "200":
+    description: "Success"
+  "404":
+    description: "Not Found"
+`,
+			path:     `$.responses[200]`,
+			expected: 1,
+		},
+		{
+			name: "array index still works as array index",
+			yaml: `
+items:
+  - name: "first"
+  - name: "second"
+  - name: "third"
+`,
+			path:     `$.items[0]`,
+			expected: 1,
+		},
+		{
+			name: "nested brackets in filter stay as integers",
+			yaml: `
+data:
+  - items:
+      - value: 5
+      - value: 10
+  - items:
+      - value: 15
+`,
+			path:     `$.data[?(@.items[0].value > 4)]`,
+			expected: 2,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var node yaml.Node
+			err := yaml.Unmarshal([]byte(tt.yaml), &node)
+			assert.NoError(t, err)
+
+			path, err := NewPath(tt.path)
+			assert.NoError(t, err, "failed to parse path: %s", tt.path)
+
+			results := path.Query(&node)
+			assert.Len(t, results, tt.expected, "expected %d results, got %d for path %s", tt.expected, len(results), tt.path)
+		})
+	}
+}
+
+func TestUnquotedBracketStrictModeRejection(t *testing.T) {
+	// In strict RFC 9535 mode, unquoted brackets should not produce STRING_LITERAL
+	// Instead they produce STRING (from scanLiteral) which the parser treats differently
+	yamlData := `
+paths:
+  /users:
+    get:
+      operationId: "getUsers"
+`
+	var node yaml.Node
+	err := yaml.Unmarshal([]byte(yamlData), &node)
+	assert.NoError(t, err)
+
+	// In strict mode, $[get] should still parse but 'get' is a STRING not STRING_LITERAL
+	// The parser may or may not accept this, but the behavior differs from JSONPath Plus
+	path, parseErr := NewPath(`$.paths['/users'][get]`, config.WithStrictRFC9535())
+	if parseErr == nil {
+		results := path.Query(&node)
+		// In strict mode without unquoted bracket support, this may not find results
+		_ = results
+	}
+	// We just verify it doesn't panic
+}

pkg/jsonpath/parser.go

@@ -30,18 +30,19 @@ var contextVarTokenMap = map[token.Token]contextVarKind{
 
 // JSONPath represents a JSONPath parser.
 type JSONPath struct {
-    tokenizer *token.Tokenizer
-    tokens    []token.TokenInfo
-    ast       jsonPathAST
-    current   int
-    mode      []mode
-    config    config.Config
+    tokenizer   *token.Tokenizer
+    tokens      []token.TokenInfo
+    ast         jsonPathAST
+    current     int
+    mode        []mode
+    config      config.Config
+    filterDepth int // tracks nesting depth inside filter expressions
 }
 
 // newParserPrivate creates a new JSONPath with the given tokens.
 func newParserPrivate(tokenizer *token.Tokenizer, tokens []token.TokenInfo, opts ...config.Option) *JSONPath {
     cfg := config.New(opts...)
-    return &JSONPath{tokenizer, tokens, jsonPathAST{lazyContextTracking: cfg.LazyContextTrackingEnabled()}, 0, []mode{modeNormal}, cfg}
+    return &JSONPath{tokenizer, tokens, jsonPathAST{lazyContextTracking: cfg.LazyContextTrackingEnabled(), jsonPathPlus: cfg.JSONPathPlusEnabled()}, 0, []mode{modeNormal}, cfg, 0}
 }
 
 // parse parses the JSONPath tokens and returns the root node of the AST.
@@ -155,6 +156,12 @@ func (p *JSONPath) parseInnerSegment() (retValue *innerSegment, err error) {
         dotName := p.tokens[p.current].Literal
         p.current += 1
         return &innerSegment{segmentDotMemberName, dotName, nil}, nil
+    } else if firstToken.Token == token.INTEGER && p.config.JSONPathPlusEnabled() && p.current >= 3 {
+        // JSONPath Plus: treat .201 as a member name (common for HTTP status codes in OpenAPI).
+        // Only when we're past the root (p.current >= 3 means at least $, ., and something before this).
+        dotName := p.tokens[p.current].Literal
+        p.current += 1
+        return &innerSegment{segmentDotMemberName, dotName, nil}, nil
     } else if firstToken.Token == token.BRACKET_LEFT {
         prior := p.current
         p.current += 1
@@ -244,7 +251,7 @@ func (p *JSONPath) parseSelector() (retSelector *selector, err error) {
 
         p.current++
 
-        return &selector{kind: selectorSubKindArrayIndex, index: i}, nil
+        return &selector{kind: selectorSubKindArrayIndex, index: i, jsonPathPlus: p.config.JSONPathPlusEnabled() && p.filterDepth == 0}, nil
     } else if p.tokens[p.current].Token == token.ARRAY_SLICE {
         slice, err := p.parseSliceSelector()
         if err != nil {
@@ -341,6 +348,8 @@ func (p *JSONPath) parseFilterSelector() (*selector, error) {
         return nil, p.parseFailure(&p.tokens[p.current], "expected '?'")
     }
     p.current++
+    p.filterDepth++
+    defer func() { p.filterDepth-- }()
 
     expr, err := p.parseLogicalOrExpr()
     if err != nil {
@@ -783,8 +792,9 @@ func (p *JSONPath) parseLiteral() (*literal, error) {
 
 type jsonPathAST struct {
     // "$"
-    segments []*segment
+    segments            []*segment
     lazyContextTracking bool
+    jsonPathPlus        bool // JSONPath Plus extensions enabled (unquoted brackets, mapping index fallback)
 }
 
 func (q jsonPathAST) ToString() string {

pkg/jsonpath/selector.go

@@ -23,11 +23,12 @@ type slice struct {
 }
 
 type selector struct {
-	kind   selectorSubKind
-	name   string
-	index  int64
-	slice  *slice
-	filter *filterSelector
+	kind         selectorSubKind
+	name         string
+	index        int64
+	slice        *slice
+	filter       *filterSelector
+	jsonPathPlus bool // when true, enables MappingNode fallback for array index selectors
 }
 
 func (s selector) ToString() string {