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FUTURE_COPYBARA_INTEGRATE_REVIEW=#179 from mhsong21:sort-by-descriptor-field 41497d5
PiperOrigin-RevId: 813239666

Author: kssilveira

ast/ast.go

@@ -77,6 +77,8 @@ type Node struct {
 	// Used when we want to break between the field name and values when a
 	// single-line node exceeds the requested wrap column.
 	PutSingleValueOnNextLine bool
+	// Field number from proto definition (0 if unknown/not applicable).
+	FieldNumber int32
 }
 
 // NodeLess is a sorting function that compares two *Nodes, possibly using the parent Node
@@ -267,6 +269,32 @@ func ByFieldSubfieldPath(field string, subfieldPath []string, projection func(st
 	}
 }
 
+// ByFieldNumber is a NodeLess function that orders fields by their field numbers.
+// Field numbers are populated during parsing from descriptor information.
+func ByFieldNumber(_, ni, nj *Node, isWholeSlice bool) bool {
+	if !isWholeSlice {
+		return false
+	}
+
+	numI, numJ := ni.FieldNumber, nj.FieldNumber
+
+	// If both have field numbers, sort by field number
+	if numI > 0 && numJ > 0 {
+		return numI < numJ
+	}
+
+	// If only one has field number, prioritize it
+	if numI > 0 && numJ == 0 {
+		return true // ni has priority
+	}
+	if numI == 0 && numJ > 0 {
+		return false // nj has priority
+	}
+
+	// If neither has field number, fall back to alphabetical order
+	return ni.Name < nj.Name
+}
+
 // getChildValue returns the Value of the child with the given field name,
 // or nil if no single such child exists.
 func (n *Node) getChildValue(field string) *Value {

cmd/txtpbfmt/fmt.go

@@ -24,6 +24,9 @@ var (
 	expandAllChildren                      = flag.Bool("expand_all_children", false, "Expand all children irrespective of initial state.")
 	skipAllColons                          = flag.Bool("skip_all_colons", false, "Skip colons whenever possible.")
 	sortFieldsByFieldName                  = flag.Bool("sort_fields_by_field_name", false, "Sort fields by field name.")
+	sortFieldsByFieldNumber                = flag.Bool("sort_fields_by_field_number", false, "Sort fields by field number from proto definition.")
+	protoDescriptor                        = flag.String("proto_descriptor", "", "Path to protobuf descriptor file (.desc)")
+	messageFullName                        = flag.String("message_full_name", "", "Full message type name for field number lookup (required, e.g. google.protobuf.Any)")
 	sortRepeatedFieldsByContent            = flag.Bool("sort_repeated_fields_by_content", false, "Sort adjacent scalar fields of the same field name by their contents.")
 	sortRepeatedFieldsBySubfield           = flag.String("sort_repeated_fields_by_subfield", "", "Sort adjacent message fields of the given field name by the contents of the given subfield.")
 	removeDuplicateValuesForRepeatedFields = flag.Bool("remove_duplicate_values_for_repeated_fields", false, "Remove lines that have the same field name and scalar value as another.")
@@ -88,6 +91,9 @@ func processPath(path string) error {
 		ExpandAllChildren:                      *expandAllChildren,
 		SkipAllColons:                          *skipAllColons,
 		SortFieldsByFieldName:                  *sortFieldsByFieldName,
+		SortFieldsByFieldNumber:                *sortFieldsByFieldNumber,
+		ProtoDescriptor:                        *protoDescriptor,
+		MessageFullName:                        *messageFullName,
 		SortRepeatedFieldsByContent:            *sortRepeatedFieldsByContent,
 		SortRepeatedFieldsBySubfield:           strings.Split(*sortRepeatedFieldsBySubfield, ","),
 		RemoveDuplicateValuesForRepeatedFields: *removeDuplicateValuesForRepeatedFields,

config/config.go

@@ -24,6 +24,15 @@ type Config struct {
 	// Sort fields by field name.
 	SortFieldsByFieldName bool
 
+	// Sort fields by field number from proto definition.
+	SortFieldsByFieldNumber bool
+
+	// Path to protobuf descriptor file (.desc).
+	ProtoDescriptor string
+
+	// Full message type name for field number lookup (required, e.g. google.protobuf.Any).
+	MessageFullName string
+
 	// Sort adjacent scalar fields of the same field name by their contents.
 	SortRepeatedFieldsByContent bool
 

descriptor/descriptor.go

@@ -0,0 +1,83 @@
+// Package descriptor provides functionality to load and parse Protocol Buffer descriptor files.
+package descriptor
+
+import (
+	"fmt"
+	"os"
+
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protodesc"
+	"google.golang.org/protobuf/reflect/protoreflect"
+	"google.golang.org/protobuf/reflect/protoregistry"
+
+	"google.golang.org/protobuf/types/descriptorpb"
+)
+
+// Loader provides functionality to load field numbers from descriptor files.
+type Loader struct {
+	descriptorFile string
+	files          *protoregistry.Files
+}
+
+// NewLoader creates a new descriptor loader for the given descriptor file.
+func NewLoader(descriptorFile string) (*Loader, error) {
+	if descriptorFile == "" {
+		return nil, fmt.Errorf("descriptor file is required")
+	}
+
+	data, err := os.ReadFile(descriptorFile)
+	if err != nil {
+		return nil, fmt.Errorf("failed to read descriptor file %s: %v", descriptorFile, err)
+	}
+
+	fileDescSet := &descriptorpb.FileDescriptorSet{}
+	if err := proto.Unmarshal(data, fileDescSet); err != nil {
+		return nil, fmt.Errorf("failed to unmarshal descriptor file %s: %v", descriptorFile, err)
+	}
+
+	files, err := protodesc.NewFiles(fileDescSet)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create files from descriptor file %s: %v", descriptorFile, err)
+	}
+
+	return &Loader{
+		descriptorFile: descriptorFile,
+		files:          files,
+	}, nil
+}
+
+// GetRootMessageDescriptor returns the root message descriptor for the specified messageFullName.
+// messageFullName is required and must be a valid full name (e.g., "google.protobuf.Any").
+func (l *Loader) GetRootMessageDescriptor(messageFullName string) (protoreflect.MessageDescriptor, error) {
+	if l.files == nil {
+		return nil, fmt.Errorf("descriptor not loaded, call NewLoader() first")
+	}
+
+	if messageFullName == "" {
+		// Collect available messages to help user
+		var availableMessages []string
+		l.files.RangeFiles(func(fd protoreflect.FileDescriptor) bool {
+			messages := fd.Messages()
+			for i := 0; i < messages.Len(); i++ {
+				msg := messages.Get(i)
+				availableMessages = append(availableMessages, string(msg.FullName()))
+			}
+			return true
+		})
+
+		if len(availableMessages) == 0 {
+			return nil, fmt.Errorf("No messages found in descriptor")
+		}
+		return nil, fmt.Errorf("message_full_name is required. Available messages: %v", availableMessages)
+	}
+
+	// Find specific message type
+	desc, err := l.files.FindDescriptorByName(protoreflect.FullName(messageFullName))
+	if err != nil {
+		return nil, fmt.Errorf("message type %s not found: %v", messageFullName, err)
+	}
+	if msgDesc, ok := desc.(protoreflect.MessageDescriptor); ok {
+		return msgDesc, nil
+	}
+	return nil, fmt.Errorf("%s is not a message type", messageFullName)
+}

descriptor/descriptor_test.go

@@ -0,0 +1,74 @@
+package descriptor
+
+import (
+	"testing"
+
+	// Google internal testing/gobase/runfilestest package, commented out by copybara
+)
+
+func TestNewLoader(t *testing.T) {
+	t.Run("valid descriptor file", func(t *testing.T) {
+		descriptorFile := "../testdata/test.desc"
+		loader, err := NewLoader(descriptorFile)
+		if err != nil {
+			t.Fatalf("Failed to create loader: %v", err)
+		}
+		if loader == nil {
+			t.Fatal("Expected non-nil loader")
+		}
+	})
+
+	t.Run("empty descriptor file path", func(t *testing.T) {
+		_, err := NewLoader("")
+		if err == nil {
+			t.Error("Expected error for empty path")
+		}
+	})
+
+	t.Run("non-existent file", func(t *testing.T) {
+		_, err := NewLoader("nonexistent.desc")
+		if err == nil {
+			t.Error("Expected error for non-existent file")
+		}
+	})
+}
+
+func TestGetRootMessageDescriptor(t *testing.T) {
+	descriptorFile := "../testdata/test.desc"
+	loader, err := NewLoader(descriptorFile)
+	if err != nil {
+		t.Fatalf("Failed to create loader: %v", err)
+	}
+
+	tests := []struct {
+		name            string
+		messageFullName string
+		wantError       bool
+	}{
+		{"UserProfile", "testproto.UserProfile", false},
+		{"ProductCatalog", "testproto.ProductCatalog", false},
+		{"Level1Config", "testproto.Level1Config", false},
+		{"nested message", "testproto.Level1Config.Level2Config", false},
+		{"empty name", "", true},
+		{"non-existent", "testproto.NonExistent", true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			desc, err := loader.GetRootMessageDescriptor(tt.messageFullName)
+
+			if tt.wantError {
+				if err == nil {
+					t.Error("Expected error but got none")
+				}
+			} else {
+				if err != nil {
+					t.Errorf("Unexpected error: %v", err)
+				}
+				if desc == nil {
+					t.Error("Expected descriptor but got nil")
+				}
+			}
+		})
+	}
+}

go.mod

@@ -7,4 +7,5 @@ require (
 	github.com/google/go-cmp v0.6.0
 	github.com/kylelemons/godebug v1.1.0
 	github.com/mitchellh/go-wordwrap v1.0.1
+	google.golang.org/protobuf v1.33.0
 )

go.sum

@@ -6,3 +6,5 @@ github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/mitchellh/go-wordwrap v1.0.1 h1:TLuKupo69TCn6TQSyGxwI1EblZZEsQ0vMlAFQflz0v0=
 github.com/mitchellh/go-wordwrap v1.0.1/go.mod h1:R62XHJLzvMFRBbcrT7m7WgmE1eOyTSsCt+hzestvNj0=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=

impl/impl.go

@@ -9,8 +9,10 @@ import (
 	"strconv"
 	"strings"
 
+	"google.golang.org/protobuf/reflect/protoreflect"
 	"github.com/protocolbuffers/txtpbfmt/ast"
 	"github.com/protocolbuffers/txtpbfmt/config"
+	"github.com/protocolbuffers/txtpbfmt/descriptor"
 	"github.com/protocolbuffers/txtpbfmt/quote"
 	"github.com/protocolbuffers/txtpbfmt/sort"
 	"github.com/protocolbuffers/txtpbfmt/wrap"
@@ -148,13 +150,33 @@ func ParseWithMetaCommentConfig(in []byte, c config.Config) ([]*ast.Node, error)
 	if err != nil {
 		return nil, err
 	}
+
+	// Load descriptor if field number sorting is enabled
+	var rootDesc protoreflect.MessageDescriptor
+	if c.SortFieldsByFieldNumber {
+		if c.ProtoDescriptor == "" {
+			return nil, fmt.Errorf("proto_descriptor is required when using sort_fields_by_field_number")
+		}
+
+		loader, err := descriptor.NewLoader(c.ProtoDescriptor)
+		if err != nil {
+			return nil, fmt.Errorf("failed to create descriptor loader: %v", err)
+		}
+
+		// Get root message descriptor
+		rootDesc, err = loader.GetRootMessageDescriptor(c.MessageFullName)
+		if err != nil {
+			return nil, fmt.Errorf("failed to get root message descriptor: %v", err)
+		}
+	}
+
 	if p.config.InfoLevel() {
 		p.config.Infof("p.in: %q", string(p.in))
 		p.config.Infof("p.length: %v", p.length)
 	}
 	// Although unnamed nodes aren't strictly allowed, some formats represent a
 	// list of protos as a list of unnamed top-level nodes.
-	nodes, _, err := p.parse( /*isRoot=*/ true)
+	nodes, _, err := p.parse( /*isRoot=*/ true, rootDesc)
 	if err != nil {
 		return nil, err
 	}
@@ -288,6 +310,35 @@ func newParser(in []byte, c config.Config) (*parser, error) {
 	return parser, nil
 }
 
+// getFieldNumber returns the field number for a given field name in the descriptor.
+func getFieldNumber(desc protoreflect.MessageDescriptor, fieldName string) int32 {
+	if desc == nil {
+		return 0
+	}
+
+	field := desc.Fields().ByTextName(fieldName)
+	if field == nil {
+		return 0
+	}
+	return int32(field.Number())
+}
+
+// findChildDescriptor finds the descriptor for a nested message field.
+func (p *parser) findChildDescriptor(desc protoreflect.MessageDescriptor, fieldName string) protoreflect.MessageDescriptor {
+	if desc == nil {
+		return nil
+	}
+
+	field := desc.Fields().ByTextName(fieldName)
+	if field == nil {
+		return nil
+	}
+	if field.Kind() == protoreflect.MessageKind {
+		return field.Message()
+	}
+	return nil
+}
+
 func (p *parser) nextInputIs(b byte) bool {
 	return p.index < p.length && p.in[p.index] == b
 }
@@ -398,7 +449,7 @@ func (p *parser) consumeOptionalSeparator() error {
 // format (sequence of messages, each of which passes proto.UnmarshalText()).
 // endPos is the position of the first character on the first line
 // after parsed nodes: that's the position to append more children.
-func (p *parser) parse(isRoot bool) (result []*ast.Node, endPos ast.Position, err error) {
+func (p *parser) parse(isRoot bool, desc protoreflect.MessageDescriptor) (result []*ast.Node, endPos ast.Position, err error) {
 	var res []*ast.Node
 	res = []*ast.Node{} // empty children is different from nil children
 	for ld := p.getLoopDetector(); p.index < p.length; {
@@ -505,14 +556,17 @@ func (p *parser) parse(isRoot bool) (result []*ast.Node, endPos ast.Position, er
 			return nil, ast.Position{}, err
 		}
 
+		// Set field number from descriptor if available
+		nd.FieldNumber = getFieldNumber(desc, nd.Name)
+
 		// Skip separator.
 		preCommentsBeforeColon, _ := p.skipWhiteSpaceAndReadComments(true /* multiLine */)
 		nd.SkipColon = !p.consume(':')
 		previousPos := p.position()
 		preCommentsAfterColon, _ := p.skipWhiteSpaceAndReadComments(true /* multiLine */)
 
 		if p.consume('{') || p.consume('<') {
-			if err := p.parseMessage(nd); err != nil {
+			if err := p.parseMessage(nd, desc); err != nil {
 				return nil, ast.Position{}, err
 			}
 		} else if p.consume('[') {
@@ -562,14 +616,15 @@ func (p *parser) parseFieldName(nd *ast.Node, isRoot bool) error {
 	return nil
 }
 
-func (p *parser) parseMessage(nd *ast.Node) error {
+func (p *parser) parseMessage(nd *ast.Node, desc protoreflect.MessageDescriptor) error {
 	if p.config.SkipAllColons {
 		nd.SkipColon = true
 	}
 	nd.ChildrenSameLine = p.bracketSameLine[p.index-1]
 	nd.IsAngleBracket = p.config.PreserveAngleBrackets && p.in[p.index-1] == '<'
 	// Recursive call to parse child nodes.
-	nodes, lastPos, err := p.parse( /*isRoot=*/ false)
+	childDesc := p.findChildDescriptor(desc, nd.Name)
+	nodes, lastPos, err := p.parse( /*isRoot=*/ false, childDesc)
 	if err != nil {
 		return err
 	}
@@ -595,7 +650,7 @@ func (p *parser) parseList(nd *ast.Node, preCommentsBeforeColon, preCommentsAfte
 		// Handle list of nodes.
 		nd.ChildrenAsList = true
 
-		nodes, lastPos, err := p.parse( /*isRoot=*/ true)
+		nodes, lastPos, err := p.parse( /*isRoot=*/ true, nil)
 		if err != nil {
 			return err
 		}