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vendor.github.com.golang.protobuf.proto.text_decode.go Maven / Gradle / Ivy
// Copyright 2010 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package proto
import (
"encoding"
"errors"
"fmt"
"reflect"
"strconv"
"strings"
"unicode/utf8"
"google.golang.org/protobuf/encoding/prototext"
protoV2 "google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
)
const wrapTextUnmarshalV2 = false
// ParseError is returned by UnmarshalText.
type ParseError struct {
Message string
// Deprecated: Do not use.
Line, Offset int
}
func (e *ParseError) Error() string {
if wrapTextUnmarshalV2 {
return e.Message
}
if e.Line == 1 {
return fmt.Sprintf("line 1.%d: %v", e.Offset, e.Message)
}
return fmt.Sprintf("line %d: %v", e.Line, e.Message)
}
// UnmarshalText parses a proto text formatted string into m.
func UnmarshalText(s string, m Message) error {
if u, ok := m.(encoding.TextUnmarshaler); ok {
return u.UnmarshalText([]byte(s))
}
m.Reset()
mi := MessageV2(m)
if wrapTextUnmarshalV2 {
err := prototext.UnmarshalOptions{
AllowPartial: true,
}.Unmarshal([]byte(s), mi)
if err != nil {
return &ParseError{Message: err.Error()}
}
return checkRequiredNotSet(mi)
} else {
if err := newTextParser(s).unmarshalMessage(mi.ProtoReflect(), ""); err != nil {
return err
}
return checkRequiredNotSet(mi)
}
}
type textParser struct {
s string // remaining input
done bool // whether the parsing is finished (success or error)
backed bool // whether back() was called
offset, line int
cur token
}
type token struct {
value string
err *ParseError
line int // line number
offset int // byte number from start of input, not start of line
unquoted string // the unquoted version of value, if it was a quoted string
}
func newTextParser(s string) *textParser {
p := new(textParser)
p.s = s
p.line = 1
p.cur.line = 1
return p
}
func (p *textParser) unmarshalMessage(m protoreflect.Message, terminator string) (err error) {
md := m.Descriptor()
fds := md.Fields()
// A struct is a sequence of "name: value", terminated by one of
// '>' or '}', or the end of the input. A name may also be
// "[extension]" or "[type/url]".
//
// The whole struct can also be an expanded Any message, like:
// [type/url] < ... struct contents ... >
seen := make(map[protoreflect.FieldNumber]bool)
for {
tok := p.next()
if tok.err != nil {
return tok.err
}
if tok.value == terminator {
break
}
if tok.value == "[" {
if err := p.unmarshalExtensionOrAny(m, seen); err != nil {
return err
}
continue
}
// This is a normal, non-extension field.
name := protoreflect.Name(tok.value)
fd := fds.ByName(name)
switch {
case fd == nil:
gd := fds.ByName(protoreflect.Name(strings.ToLower(string(name))))
if gd != nil && gd.Kind() == protoreflect.GroupKind && gd.Message().Name() == name {
fd = gd
}
case fd.Kind() == protoreflect.GroupKind && fd.Message().Name() != name:
fd = nil
case fd.IsWeak() && fd.Message().IsPlaceholder():
fd = nil
}
if fd == nil {
typeName := string(md.FullName())
if m, ok := m.Interface().(Message); ok {
t := reflect.TypeOf(m)
if t.Kind() == reflect.Ptr {
typeName = t.Elem().String()
}
}
return p.errorf("unknown field name %q in %v", name, typeName)
}
if od := fd.ContainingOneof(); od != nil && m.WhichOneof(od) != nil {
return p.errorf("field '%s' would overwrite already parsed oneof '%s'", name, od.Name())
}
if fd.Cardinality() != protoreflect.Repeated && seen[fd.Number()] {
return p.errorf("non-repeated field %q was repeated", fd.Name())
}
seen[fd.Number()] = true
// Consume any colon.
if err := p.checkForColon(fd); err != nil {
return err
}
// Parse into the field.
v := m.Get(fd)
if !m.Has(fd) && (fd.IsList() || fd.IsMap() || fd.Message() != nil) {
v = m.Mutable(fd)
}
if v, err = p.unmarshalValue(v, fd); err != nil {
return err
}
m.Set(fd, v)
if err := p.consumeOptionalSeparator(); err != nil {
return err
}
}
return nil
}
func (p *textParser) unmarshalExtensionOrAny(m protoreflect.Message, seen map[protoreflect.FieldNumber]bool) error {
name, err := p.consumeExtensionOrAnyName()
if err != nil {
return err
}
// If it contains a slash, it's an Any type URL.
if slashIdx := strings.LastIndex(name, "/"); slashIdx >= 0 {
tok := p.next()
if tok.err != nil {
return tok.err
}
// consume an optional colon
if tok.value == ":" {
tok = p.next()
if tok.err != nil {
return tok.err
}
}
var terminator string
switch tok.value {
case "<":
terminator = ">"
case "{":
terminator = "}"
default:
return p.errorf("expected '{' or '<', found %q", tok.value)
}
mt, err := protoregistry.GlobalTypes.FindMessageByURL(name)
if err != nil {
return p.errorf("unrecognized message %q in google.protobuf.Any", name[slashIdx+len("/"):])
}
m2 := mt.New()
if err := p.unmarshalMessage(m2, terminator); err != nil {
return err
}
b, err := protoV2.Marshal(m2.Interface())
if err != nil {
return p.errorf("failed to marshal message of type %q: %v", name[slashIdx+len("/"):], err)
}
urlFD := m.Descriptor().Fields().ByName("type_url")
valFD := m.Descriptor().Fields().ByName("value")
if seen[urlFD.Number()] {
return p.errorf("Any message unpacked multiple times, or %q already set", urlFD.Name())
}
if seen[valFD.Number()] {
return p.errorf("Any message unpacked multiple times, or %q already set", valFD.Name())
}
m.Set(urlFD, protoreflect.ValueOfString(name))
m.Set(valFD, protoreflect.ValueOfBytes(b))
seen[urlFD.Number()] = true
seen[valFD.Number()] = true
return nil
}
xname := protoreflect.FullName(name)
xt, _ := protoregistry.GlobalTypes.FindExtensionByName(xname)
if xt == nil && isMessageSet(m.Descriptor()) {
xt, _ = protoregistry.GlobalTypes.FindExtensionByName(xname.Append("message_set_extension"))
}
if xt == nil {
return p.errorf("unrecognized extension %q", name)
}
fd := xt.TypeDescriptor()
if fd.ContainingMessage().FullName() != m.Descriptor().FullName() {
return p.errorf("extension field %q does not extend message %q", name, m.Descriptor().FullName())
}
if err := p.checkForColon(fd); err != nil {
return err
}
v := m.Get(fd)
if !m.Has(fd) && (fd.IsList() || fd.IsMap() || fd.Message() != nil) {
v = m.Mutable(fd)
}
v, err = p.unmarshalValue(v, fd)
if err != nil {
return err
}
m.Set(fd, v)
return p.consumeOptionalSeparator()
}
func (p *textParser) unmarshalValue(v protoreflect.Value, fd protoreflect.FieldDescriptor) (protoreflect.Value, error) {
tok := p.next()
if tok.err != nil {
return v, tok.err
}
if tok.value == "" {
return v, p.errorf("unexpected EOF")
}
switch {
case fd.IsList():
lv := v.List()
var err error
if tok.value == "[" {
// Repeated field with list notation, like [1,2,3].
for {
vv := lv.NewElement()
vv, err = p.unmarshalSingularValue(vv, fd)
if err != nil {
return v, err
}
lv.Append(vv)
tok := p.next()
if tok.err != nil {
return v, tok.err
}
if tok.value == "]" {
break
}
if tok.value != "," {
return v, p.errorf("Expected ']' or ',' found %q", tok.value)
}
}
return v, nil
}
// One value of the repeated field.
p.back()
vv := lv.NewElement()
vv, err = p.unmarshalSingularValue(vv, fd)
if err != nil {
return v, err
}
lv.Append(vv)
return v, nil
case fd.IsMap():
// The map entry should be this sequence of tokens:
// < key : KEY value : VALUE >
// However, implementations may omit key or value, and technically
// we should support them in any order.
var terminator string
switch tok.value {
case "<":
terminator = ">"
case "{":
terminator = "}"
default:
return v, p.errorf("expected '{' or '<', found %q", tok.value)
}
keyFD := fd.MapKey()
valFD := fd.MapValue()
mv := v.Map()
kv := keyFD.Default()
vv := mv.NewValue()
for {
tok := p.next()
if tok.err != nil {
return v, tok.err
}
if tok.value == terminator {
break
}
var err error
switch tok.value {
case "key":
if err := p.consumeToken(":"); err != nil {
return v, err
}
if kv, err = p.unmarshalSingularValue(kv, keyFD); err != nil {
return v, err
}
if err := p.consumeOptionalSeparator(); err != nil {
return v, err
}
case "value":
if err := p.checkForColon(valFD); err != nil {
return v, err
}
if vv, err = p.unmarshalSingularValue(vv, valFD); err != nil {
return v, err
}
if err := p.consumeOptionalSeparator(); err != nil {
return v, err
}
default:
p.back()
return v, p.errorf(`expected "key", "value", or %q, found %q`, terminator, tok.value)
}
}
mv.Set(kv.MapKey(), vv)
return v, nil
default:
p.back()
return p.unmarshalSingularValue(v, fd)
}
}
func (p *textParser) unmarshalSingularValue(v protoreflect.Value, fd protoreflect.FieldDescriptor) (protoreflect.Value, error) {
tok := p.next()
if tok.err != nil {
return v, tok.err
}
if tok.value == "" {
return v, p.errorf("unexpected EOF")
}
switch fd.Kind() {
case protoreflect.BoolKind:
switch tok.value {
case "true", "1", "t", "True":
return protoreflect.ValueOfBool(true), nil
case "false", "0", "f", "False":
return protoreflect.ValueOfBool(false), nil
}
case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
if x, err := strconv.ParseInt(tok.value, 0, 32); err == nil {
return protoreflect.ValueOfInt32(int32(x)), nil
}
// The C++ parser accepts large positive hex numbers that uses
// two's complement arithmetic to represent negative numbers.
// This feature is here for backwards compatibility with C++.
if strings.HasPrefix(tok.value, "0x") {
if x, err := strconv.ParseUint(tok.value, 0, 32); err == nil {
return protoreflect.ValueOfInt32(int32(-(int64(^x) + 1))), nil
}
}
case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
if x, err := strconv.ParseInt(tok.value, 0, 64); err == nil {
return protoreflect.ValueOfInt64(int64(x)), nil
}
// The C++ parser accepts large positive hex numbers that uses
// two's complement arithmetic to represent negative numbers.
// This feature is here for backwards compatibility with C++.
if strings.HasPrefix(tok.value, "0x") {
if x, err := strconv.ParseUint(tok.value, 0, 64); err == nil {
return protoreflect.ValueOfInt64(int64(-(int64(^x) + 1))), nil
}
}
case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
if x, err := strconv.ParseUint(tok.value, 0, 32); err == nil {
return protoreflect.ValueOfUint32(uint32(x)), nil
}
case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
if x, err := strconv.ParseUint(tok.value, 0, 64); err == nil {
return protoreflect.ValueOfUint64(uint64(x)), nil
}
case protoreflect.FloatKind:
// Ignore 'f' for compatibility with output generated by C++,
// but don't remove 'f' when the value is "-inf" or "inf".
v := tok.value
if strings.HasSuffix(v, "f") && v != "-inf" && v != "inf" {
v = v[:len(v)-len("f")]
}
if x, err := strconv.ParseFloat(v, 32); err == nil {
return protoreflect.ValueOfFloat32(float32(x)), nil
}
case protoreflect.DoubleKind:
// Ignore 'f' for compatibility with output generated by C++,
// but don't remove 'f' when the value is "-inf" or "inf".
v := tok.value
if strings.HasSuffix(v, "f") && v != "-inf" && v != "inf" {
v = v[:len(v)-len("f")]
}
if x, err := strconv.ParseFloat(v, 64); err == nil {
return protoreflect.ValueOfFloat64(float64(x)), nil
}
case protoreflect.StringKind:
if isQuote(tok.value[0]) {
return protoreflect.ValueOfString(tok.unquoted), nil
}
case protoreflect.BytesKind:
if isQuote(tok.value[0]) {
return protoreflect.ValueOfBytes([]byte(tok.unquoted)), nil
}
case protoreflect.EnumKind:
if x, err := strconv.ParseInt(tok.value, 0, 32); err == nil {
return protoreflect.ValueOfEnum(protoreflect.EnumNumber(x)), nil
}
vd := fd.Enum().Values().ByName(protoreflect.Name(tok.value))
if vd != nil {
return protoreflect.ValueOfEnum(vd.Number()), nil
}
case protoreflect.MessageKind, protoreflect.GroupKind:
var terminator string
switch tok.value {
case "{":
terminator = "}"
case "<":
terminator = ">"
default:
return v, p.errorf("expected '{' or '<', found %q", tok.value)
}
err := p.unmarshalMessage(v.Message(), terminator)
return v, err
default:
panic(fmt.Sprintf("invalid kind %v", fd.Kind()))
}
return v, p.errorf("invalid %v: %v", fd.Kind(), tok.value)
}
// Consume a ':' from the input stream (if the next token is a colon),
// returning an error if a colon is needed but not present.
func (p *textParser) checkForColon(fd protoreflect.FieldDescriptor) *ParseError {
tok := p.next()
if tok.err != nil {
return tok.err
}
if tok.value != ":" {
if fd.Message() == nil {
return p.errorf("expected ':', found %q", tok.value)
}
p.back()
}
return nil
}
// consumeExtensionOrAnyName consumes an extension name or an Any type URL and
// the following ']'. It returns the name or URL consumed.
func (p *textParser) consumeExtensionOrAnyName() (string, error) {
tok := p.next()
if tok.err != nil {
return "", tok.err
}
// If extension name or type url is quoted, it's a single token.
if len(tok.value) > 2 && isQuote(tok.value[0]) && tok.value[len(tok.value)-1] == tok.value[0] {
name, err := unquoteC(tok.value[1:len(tok.value)-1], rune(tok.value[0]))
if err != nil {
return "", err
}
return name, p.consumeToken("]")
}
// Consume everything up to "]"
var parts []string
for tok.value != "]" {
parts = append(parts, tok.value)
tok = p.next()
if tok.err != nil {
return "", p.errorf("unrecognized type_url or extension name: %s", tok.err)
}
if p.done && tok.value != "]" {
return "", p.errorf("unclosed type_url or extension name")
}
}
return strings.Join(parts, ""), nil
}
// consumeOptionalSeparator consumes an optional semicolon or comma.
// It is used in unmarshalMessage to provide backward compatibility.
func (p *textParser) consumeOptionalSeparator() error {
tok := p.next()
if tok.err != nil {
return tok.err
}
if tok.value != ";" && tok.value != "," {
p.back()
}
return nil
}
func (p *textParser) errorf(format string, a ...interface{}) *ParseError {
pe := &ParseError{fmt.Sprintf(format, a...), p.cur.line, p.cur.offset}
p.cur.err = pe
p.done = true
return pe
}
func (p *textParser) skipWhitespace() {
i := 0
for i < len(p.s) && (isWhitespace(p.s[i]) || p.s[i] == '#') {
if p.s[i] == '#' {
// comment; skip to end of line or input
for i < len(p.s) && p.s[i] != '\n' {
i++
}
if i == len(p.s) {
break
}
}
if p.s[i] == '\n' {
p.line++
}
i++
}
p.offset += i
p.s = p.s[i:len(p.s)]
if len(p.s) == 0 {
p.done = true
}
}
func (p *textParser) advance() {
// Skip whitespace
p.skipWhitespace()
if p.done {
return
}
// Start of non-whitespace
p.cur.err = nil
p.cur.offset, p.cur.line = p.offset, p.line
p.cur.unquoted = ""
switch p.s[0] {
case '<', '>', '{', '}', ':', '[', ']', ';', ',', '/':
// Single symbol
p.cur.value, p.s = p.s[0:1], p.s[1:len(p.s)]
case '"', '\'':
// Quoted string
i := 1
for i < len(p.s) && p.s[i] != p.s[0] && p.s[i] != '\n' {
if p.s[i] == '\\' && i+1 < len(p.s) {
// skip escaped char
i++
}
i++
}
if i >= len(p.s) || p.s[i] != p.s[0] {
p.errorf("unmatched quote")
return
}
unq, err := unquoteC(p.s[1:i], rune(p.s[0]))
if err != nil {
p.errorf("invalid quoted string %s: %v", p.s[0:i+1], err)
return
}
p.cur.value, p.s = p.s[0:i+1], p.s[i+1:len(p.s)]
p.cur.unquoted = unq
default:
i := 0
for i < len(p.s) && isIdentOrNumberChar(p.s[i]) {
i++
}
if i == 0 {
p.errorf("unexpected byte %#x", p.s[0])
return
}
p.cur.value, p.s = p.s[0:i], p.s[i:len(p.s)]
}
p.offset += len(p.cur.value)
}
// Back off the parser by one token. Can only be done between calls to next().
// It makes the next advance() a no-op.
func (p *textParser) back() { p.backed = true }
// Advances the parser and returns the new current token.
func (p *textParser) next() *token {
if p.backed || p.done {
p.backed = false
return &p.cur
}
p.advance()
if p.done {
p.cur.value = ""
} else if len(p.cur.value) > 0 && isQuote(p.cur.value[0]) {
// Look for multiple quoted strings separated by whitespace,
// and concatenate them.
cat := p.cur
for {
p.skipWhitespace()
if p.done || !isQuote(p.s[0]) {
break
}
p.advance()
if p.cur.err != nil {
return &p.cur
}
cat.value += " " + p.cur.value
cat.unquoted += p.cur.unquoted
}
p.done = false // parser may have seen EOF, but we want to return cat
p.cur = cat
}
return &p.cur
}
func (p *textParser) consumeToken(s string) error {
tok := p.next()
if tok.err != nil {
return tok.err
}
if tok.value != s {
p.back()
return p.errorf("expected %q, found %q", s, tok.value)
}
return nil
}
var errBadUTF8 = errors.New("proto: bad UTF-8")
func unquoteC(s string, quote rune) (string, error) {
// This is based on C++'s tokenizer.cc.
// Despite its name, this is *not* parsing C syntax.
// For instance, "\0" is an invalid quoted string.
// Avoid allocation in trivial cases.
simple := true
for _, r := range s {
if r == '\\' || r == quote {
simple = false
break
}
}
if simple {
return s, nil
}
buf := make([]byte, 0, 3*len(s)/2)
for len(s) > 0 {
r, n := utf8.DecodeRuneInString(s)
if r == utf8.RuneError && n == 1 {
return "", errBadUTF8
}
s = s[n:]
if r != '\\' {
if r < utf8.RuneSelf {
buf = append(buf, byte(r))
} else {
buf = append(buf, string(r)...)
}
continue
}
ch, tail, err := unescape(s)
if err != nil {
return "", err
}
buf = append(buf, ch...)
s = tail
}
return string(buf), nil
}
func unescape(s string) (ch string, tail string, err error) {
r, n := utf8.DecodeRuneInString(s)
if r == utf8.RuneError && n == 1 {
return "", "", errBadUTF8
}
s = s[n:]
switch r {
case 'a':
return "\a", s, nil
case 'b':
return "\b", s, nil
case 'f':
return "\f", s, nil
case 'n':
return "\n", s, nil
case 'r':
return "\r", s, nil
case 't':
return "\t", s, nil
case 'v':
return "\v", s, nil
case '?':
return "?", s, nil // trigraph workaround
case '\'', '"', '\\':
return string(r), s, nil
case '0', '1', '2', '3', '4', '5', '6', '7':
if len(s) < 2 {
return "", "", fmt.Errorf(`\%c requires 2 following digits`, r)
}
ss := string(r) + s[:2]
s = s[2:]
i, err := strconv.ParseUint(ss, 8, 8)
if err != nil {
return "", "", fmt.Errorf(`\%s contains non-octal digits`, ss)
}
return string([]byte{byte(i)}), s, nil
case 'x', 'X', 'u', 'U':
var n int
switch r {
case 'x', 'X':
n = 2
case 'u':
n = 4
case 'U':
n = 8
}
if len(s) < n {
return "", "", fmt.Errorf(`\%c requires %d following digits`, r, n)
}
ss := s[:n]
s = s[n:]
i, err := strconv.ParseUint(ss, 16, 64)
if err != nil {
return "", "", fmt.Errorf(`\%c%s contains non-hexadecimal digits`, r, ss)
}
if r == 'x' || r == 'X' {
return string([]byte{byte(i)}), s, nil
}
if i > utf8.MaxRune {
return "", "", fmt.Errorf(`\%c%s is not a valid Unicode code point`, r, ss)
}
return string(rune(i)), s, nil
}
return "", "", fmt.Errorf(`unknown escape \%c`, r)
}
func isIdentOrNumberChar(c byte) bool {
switch {
case 'A' <= c && c <= 'Z', 'a' <= c && c <= 'z':
return true
case '0' <= c && c <= '9':
return true
}
switch c {
case '-', '+', '.', '_':
return true
}
return false
}
func isWhitespace(c byte) bool {
switch c {
case ' ', '\t', '\n', '\r':
return true
}
return false
}
func isQuote(c byte) bool {
switch c {
case '"', '\'':
return true
}
return false
}
