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 // Protocol Buffers - Google's data interchange format
 // Copyright 2008 Google LLC.  All rights reserved.
 //
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file or at
 // https://developers.google.com/open-source/licenses/bsd
 
 // Author: jschorr@google.com (Joseph Schorr)
 //  Based on original Protocol Buffers design by
 //  Sanjay Ghemawat, Jeff Dean, and others.
 //
 // Utilities for printing and parsing protocol messages in a human-readable,
 // text-based format.
 
 #ifndef GOOGLE_PROTOBUF_TEXT_FORMAT_H__
 #define GOOGLE_PROTOBUF_TEXT_FORMAT_H__
 
 #include <atomic>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "absl/container/flat_hash_map.h"
 #include "absl/container/flat_hash_set.h"
 #include "absl/strings/cord.h"
 #include "absl/strings/string_view.h"
 #include "google/protobuf/descriptor.h"
 #include "google/protobuf/message.h"
 #include "google/protobuf/message_lite.h"
 #include "google/protobuf/port.h"
 
 
 // Must be included last.
 #include "google/protobuf/port_def.inc"
 
 #ifdef SWIG
 #error "You cannot SWIG proto headers"
 #endif
 
 namespace google {
 namespace protobuf {
 
 namespace internal {
 PROTOBUF_EXPORT extern const char kDebugStringSilentMarker[1];
 PROTOBUF_EXPORT extern const char kDebugStringSilentMarkerForDetection[3];
 
 PROTOBUF_EXPORT extern std::atomic<bool> enable_debug_string_safe_format;
 PROTOBUF_EXPORT int64_t GetRedactedFieldCount();
 PROTOBUF_EXPORT bool ShouldRedactField(const FieldDescriptor* field);
 
 // This enum contains all the APIs that convert protos to human-readable
 // formats. A higher-level API must correspond to a greater number than any
 // lower-level APIs it calls under the hood (e.g kDebugString >
 // kMemberPrintToString > kPrintWithStream).
 PROTOBUF_EXPORT enum class FieldReporterLevel {
   kNoReport = 0,
   kPrintMessage = 1,
   kPrintWithGenerator = 2,
   kPrintWithStream = 3,
   kMemberPrintToString = 4,
   kStaticPrintToString = 5,
   kAbslStringify = 6,
   kShortFormat = 7,
   kUtf8Format = 8,
   kDebugString = 12,
   kShortDebugString = 13,
   kUtf8DebugString = 14,
   kUnredactedDebugFormatForTest = 15,
   kUnredactedShortDebugFormatForTest = 16,
   kUnredactedUtf8DebugFormatForTest = 17
 };
 
 }  // namespace internal
 
 namespace io {
 class ErrorCollector;  // tokenizer.h
 }
 
 namespace python {
 namespace cmessage {
 class PythonFieldValuePrinter;
 }
 }  // namespace python
 
 namespace internal {
 // Enum used to set printing options for StringifyMessage.
 PROTOBUF_EXPORT enum class Option;
 
 // Converts a protobuf message to a string. If enable_safe_format is true,
 // sensitive fields are redacted, and a per-process randomized prefix is
 // inserted.
 PROTOBUF_EXPORT std::string StringifyMessage(const Message& message,
                                              Option option,
                                              FieldReporterLevel reporter_level,
                                              bool enable_safe_format);
 
 class UnsetFieldsMetadataTextFormatTestUtil;
 class UnsetFieldsMetadataMessageDifferencerTestUtil;
 }  // namespace internal
 
 // This class implements protocol buffer text format, colloquially known as text
 // proto.  Printing and parsing protocol messages in text format is useful for
 // debugging and human editing of messages.
 //
 // This class is really a namespace that contains only static methods.
 class PROTOBUF_EXPORT TextFormat {
  public:
   TextFormat(const TextFormat&) = delete;
   TextFormat& operator=(const TextFormat&) = delete;
 
   // Outputs a textual representation of the given message to the given
   // output stream. Returns false if printing fails.
   static bool Print(const Message& message, io::ZeroCopyOutputStream* output);
 
   // Print the fields in an UnknownFieldSet.  They are printed by tag number
   // only.  Embedded messages are heuristically identified by attempting to
   // parse them. Returns false if printing fails.
   static bool PrintUnknownFields(const UnknownFieldSet& unknown_fields,
                                  io::ZeroCopyOutputStream* output);
 
   // Like Print(), but outputs directly to a string.
   // Note: output will be cleared prior to printing, and will be left empty
   // even if printing fails. Returns false if printing fails.
   static bool PrintToString(const Message& message, std::string* output);
 
   // Like PrintUnknownFields(), but outputs directly to a string. Returns
   // false if printing fails.
   static bool PrintUnknownFieldsToString(const UnknownFieldSet& unknown_fields,
                                          std::string* output);
 
   // Outputs a textual representation of the value of the field supplied on
   // the message supplied. For non-repeated fields, an index of -1 must
   // be supplied. Note that this method will print the default value for a
   // field if it is not set.
   static void PrintFieldValueToString(const Message& message,
                                       const FieldDescriptor* field, int index,
                                       std::string* output);
 
   // Forward declare `Printer` for `BaseTextGenerator::MarkerToken` which
   // restricts some methods of `BaseTextGenerator` to the class `Printer`.
   class Printer;
 
   class PROTOBUF_EXPORT BaseTextGenerator {
    private:
     // Passkey (go/totw/134#what-about-stdshared-ptr) that allows `Printer`
     // (but not derived classes) to call `PrintMaybeWithMarker` and its
     // `Printer::TextGenerator` to overload it.
     // This prevents users from bypassing the marker generation.
     class MarkerToken {
      private:
       explicit MarkerToken() = default;  // 'explicit' prevents aggregate init.
       friend class Printer;
     };
 
    public:
     virtual ~BaseTextGenerator();
 
     virtual void Indent() {}
     virtual void Outdent() {}
     // Returns the current indentation size in characters.
     virtual size_t GetCurrentIndentationSize() const { return 0; }
 
     // Print text to the output stream.
     virtual void Print(const char* text, size_t size) = 0;
 
     void PrintString(absl::string_view str) { Print(str.data(), str.size()); }
 
     template <size_t n>
     void PrintLiteral(const char (&text)[n]) {
       Print(text, n - 1);  // n includes the terminating zero character.
     }
 
     // Internal to Printer, access regulated by `MarkerToken`.
     virtual void PrintMaybeWithMarker(MarkerToken, absl::string_view text) {
       Print(text.data(), text.size());
     }
 
     // Internal to Printer, access regulated by `MarkerToken`.
     virtual void PrintMaybeWithMarker(MarkerToken, absl::string_view text_head,
                                       absl::string_view text_tail) {
       Print(text_head.data(), text_head.size());
       Print(text_tail.data(), text_tail.size());
     }
 
     friend class Printer;
   };
 
   // The default printer that converts scalar values from fields into their
   // string representation.
   // You can derive from this FastFieldValuePrinter if you want to have fields
   // to be printed in a different way and register it at the Printer.
   class PROTOBUF_EXPORT FastFieldValuePrinter {
    public:
     FastFieldValuePrinter();
     FastFieldValuePrinter(const FastFieldValuePrinter&) = delete;
     FastFieldValuePrinter& operator=(const FastFieldValuePrinter&) = delete;
     virtual ~FastFieldValuePrinter();
     virtual void PrintBool(bool val, BaseTextGenerator* generator) const;
     virtual void PrintInt32(int32_t val, BaseTextGenerator* generator) const;
     virtual void PrintUInt32(uint32_t val, BaseTextGenerator* generator) const;
     virtual void PrintInt64(int64_t val, BaseTextGenerator* generator) const;
     virtual void PrintUInt64(uint64_t val, BaseTextGenerator* generator) const;
     virtual void PrintFloat(float val, BaseTextGenerator* generator) const;
     virtual void PrintDouble(double val, BaseTextGenerator* generator) const;
     virtual void PrintString(const std::string& val,
                              BaseTextGenerator* generator) const;
     virtual void PrintBytes(const std::string& val,
                             BaseTextGenerator* generator) const;
     virtual void PrintEnum(int32_t val, const std::string& name,
                            BaseTextGenerator* generator) const;
     virtual void PrintFieldName(const Message& message, int field_index,
                                 int field_count, const Reflection* reflection,
                                 const FieldDescriptor* field,
                                 BaseTextGenerator* generator) const;
     virtual void PrintFieldName(const Message& message,
                                 const Reflection* reflection,
                                 const FieldDescriptor* field,
                                 BaseTextGenerator* generator) const;
     virtual void PrintMessageStart(const Message& message, int field_index,
                                    int field_count, bool single_line_mode,
                                    BaseTextGenerator* generator) const;
     // Allows to override the logic on how to print the content of a message.
     // Return false to use the default printing logic. Note that it is legal for
     // this function to print something and then return false to use the default
     // content printing (although at that point it would behave similarly to
     // PrintMessageStart).
     virtual bool PrintMessageContent(const Message& message, int field_index,
                                      int field_count, bool single_line_mode,
                                      BaseTextGenerator* generator) const;
     virtual void PrintMessageEnd(const Message& message, int field_index,
                                  int field_count, bool single_line_mode,
                                  BaseTextGenerator* generator) const;
   };
 
   // Deprecated: please use FastFieldValuePrinter instead.
   class PROTOBUF_EXPORT FieldValuePrinter {
    public:
     FieldValuePrinter();
     FieldValuePrinter(const FieldValuePrinter&) = delete;
     FieldValuePrinter& operator=(const FieldValuePrinter&) = delete;
     virtual ~FieldValuePrinter();
     virtual std::string PrintBool(bool val) const;
     virtual std::string PrintInt32(int32_t val) const;
     virtual std::string PrintUInt32(uint32_t val) const;
     virtual std::string PrintInt64(int64_t val) const;
     virtual std::string PrintUInt64(uint64_t val) const;
     virtual std::string PrintFloat(float val) const;
     virtual std::string PrintDouble(double val) const;
     virtual std::string PrintString(const std::string& val) const;
     virtual std::string PrintBytes(const std::string& val) const;
     virtual std::string PrintEnum(int32_t val, const std::string& name) const;
     virtual std::string PrintFieldName(const Message& message,
                                        const Reflection* reflection,
                                        const FieldDescriptor* field) const;
     virtual std::string PrintMessageStart(const Message& message,
                                           int field_index, int field_count,
                                           bool single_line_mode) const;
     virtual std::string PrintMessageEnd(const Message& message, int field_index,
                                         int field_count,
                                         bool single_line_mode) const;
 
    private:
     FastFieldValuePrinter delegate_;
   };
 
   class PROTOBUF_EXPORT MessagePrinter {
    public:
     MessagePrinter() {}
     MessagePrinter(const MessagePrinter&) = delete;
     MessagePrinter& operator=(const MessagePrinter&) = delete;
     virtual ~MessagePrinter() {}
     virtual void Print(const Message& message, bool single_line_mode,
                        BaseTextGenerator* generator) const = 0;
   };
 
   // Interface that Printers or Parsers can use to find extensions, or types
   // referenced in Any messages.
   class PROTOBUF_EXPORT Finder {
    public:
     virtual ~Finder();
 
     // Try to find an extension of *message by fully-qualified field
     // name.  Returns nullptr if no extension is known for this name or number.
     // The base implementation uses the extensions already known by the message.
     virtual const FieldDescriptor* FindExtension(Message* message,
                                                  const std::string& name) const;
 
     // Similar to FindExtension, but uses a Descriptor and the extension number
     // instead of using a Message and the name when doing the look up.
     virtual const FieldDescriptor* FindExtensionByNumber(
         const Descriptor* descriptor, int number) const;
 
     // Find the message type for an Any proto.
     // Returns nullptr if no message is known for this name.
     // The base implementation only accepts prefixes of type.googleprod.com/ or
     // type.googleapis.com/, and searches the DescriptorPool of the parent
     // message.
     virtual const Descriptor* FindAnyType(const Message& message,
                                           const std::string& prefix,
                                           const std::string& name) const;
 
     // Find the message factory for the given extension field. This can be used
     // to generalize the Parser to add extension fields to a message in the same
     // way as the "input" message for the Parser.
     virtual MessageFactory* FindExtensionFactory(
         const FieldDescriptor* field) const;
   };
 
   // Class for those users which require more fine-grained control over how
   // a protobuffer message is printed out.
   class PROTOBUF_EXPORT Printer {
    public:
     Printer();
 
     // Like TextFormat::Print
     bool Print(const Message& message, io::ZeroCopyOutputStream* output) const;
     // Like TextFormat::Printer::Print but takes an additional
     // internal::FieldReporterLevel
     bool Print(const Message& message, io::ZeroCopyOutputStream* output,
                internal::FieldReporterLevel reporter) const;
     // Like TextFormat::PrintUnknownFields
     bool PrintUnknownFields(const UnknownFieldSet& unknown_fields,
                             io::ZeroCopyOutputStream* output) const;
     // Like TextFormat::PrintToString
     bool PrintToString(const Message& message, std::string* output) const;
     // Like TextFormat::PrintUnknownFieldsToString
     bool PrintUnknownFieldsToString(const UnknownFieldSet& unknown_fields,
                                     std::string* output) const;
     // Like TextFormat::PrintFieldValueToString
     void PrintFieldValueToString(const Message& message,
                                  const FieldDescriptor* field, int index,
                                  std::string* output) const;
 
     // Adjust the initial indent level of all output.  Each indent level is
     // equal to two spaces.
     void SetInitialIndentLevel(int indent_level) {
       initial_indent_level_ = indent_level;
     }
 
     // If printing in single line mode, then the entire message will be output
     // on a single line with no line breaks.
     void SetSingleLineMode(bool single_line_mode) {
       single_line_mode_ = single_line_mode;
     }
 
     bool IsInSingleLineMode() const { return single_line_mode_; }
 
     // If use_field_number is true, uses field number instead of field name.
     void SetUseFieldNumber(bool use_field_number) {
       use_field_number_ = use_field_number;
     }
 
     // Set true to print repeated primitives in a format like:
     //   field_name: [1, 2, 3, 4]
     // instead of printing each value on its own line.  Short format applies
     // only to primitive values -- i.e. everything except strings and
     // sub-messages/groups.
     void SetUseShortRepeatedPrimitives(bool use_short_repeated_primitives) {
       use_short_repeated_primitives_ = use_short_repeated_primitives;
     }
 
     // Set true to output UTF-8 instead of ASCII.  The only difference
     // is that bytes >= 0x80 in string fields will not be escaped,
     // because they are assumed to be part of UTF-8 multi-byte
     // sequences. This will change the default FastFieldValuePrinter.
     void SetUseUtf8StringEscaping(bool as_utf8);
 
     // Set the default FastFieldValuePrinter that is used for all fields that
     // don't have a field-specific printer registered.
     // Takes ownership of the printer.
     void SetDefaultFieldValuePrinter(const FastFieldValuePrinter* printer);
 
     [[deprecated("Please use FastFieldValuePrinter")]] void
     SetDefaultFieldValuePrinter(const FieldValuePrinter* printer);
 
     // Sets whether we want to hide unknown fields or not.
     // Usually unknown fields are printed in a generic way that includes the
     // tag number of the field instead of field name. However, sometimes it
     // is useful to be able to print the message without unknown fields (e.g.
     // for the python protobuf version to maintain consistency between its pure
     // python and c++ implementations).
     void SetHideUnknownFields(bool hide) { hide_unknown_fields_ = hide; }
 
     // If print_message_fields_in_index_order is true, fields of a proto message
     // will be printed using the order defined in source code instead of the
     // field number, extensions will be printed at the end of the message
     // and their relative order is determined by the extension number.
     // By default, use the field number order.
     void SetPrintMessageFieldsInIndexOrder(
         bool print_message_fields_in_index_order) {
       print_message_fields_in_index_order_ =
           print_message_fields_in_index_order;
     }
 
     // If expand==true, expand google.protobuf.Any payloads. The output
     // will be of form
     //    [type_url] { <value_printed_in_text> }
     //
     // If expand==false, print Any using the default printer. The output will
     // look like
     //    type_url: "<type_url>"  value: "serialized_content"
     void SetExpandAny(bool expand) { expand_any_ = expand; }
 
     // Set how parser finds message for Any payloads.
     void SetFinder(const Finder* finder) { finder_ = finder; }
 
     // If non-zero, we truncate all string fields that are  longer than
     // this threshold.  This is useful when the proto message has very long
     // strings, e.g., dump of encoded image file.
     //
     // NOTE:  Setting a non-zero value breaks round-trip safe
     // property of TextFormat::Printer.  That is, from the printed message, we
     // cannot fully recover the original string field any more.
     void SetTruncateStringFieldLongerThan(
         const int64_t truncate_string_field_longer_than) {
       truncate_string_field_longer_than_ = truncate_string_field_longer_than;
     }
 
     // Sets whether sensitive fields found in the message will be reported or
     // not.
     void SetReportSensitiveFields(internal::FieldReporterLevel reporter) {
       if (report_sensitive_fields_ < reporter) {
         report_sensitive_fields_ = reporter;
       }
     }
 
     // Register a custom field-specific FastFieldValuePrinter for fields
     // with a particular FieldDescriptor.
     // Returns "true" if the registration succeeded, or "false", if there is
     // already a printer for that FieldDescriptor.
     // Takes ownership of the printer on successful registration.
     bool RegisterFieldValuePrinter(const FieldDescriptor* field,
                                    const FastFieldValuePrinter* printer);
 
     [[deprecated("Please use FastFieldValuePrinter")]] bool
     RegisterFieldValuePrinter(const FieldDescriptor* field,
                               const FieldValuePrinter* printer);
 
     // Register a custom message-specific MessagePrinter for messages with a
     // particular Descriptor.
     // Returns "true" if the registration succeeded, or "false" if there is
     // already a printer for that Descriptor.
     bool RegisterMessagePrinter(const Descriptor* descriptor,
                                 const MessagePrinter* printer);
 
     // Default printing for messages, which allows registered message printers
     // to fall back to default printing without losing the ability to control
     // sub-messages or fields.
     // NOTE: If the passed in `text_generaor` is not actually the current
     // `TextGenerator`, then no output will be produced.
     void PrintMessage(const Message& message,
                       BaseTextGenerator* generator) const;
 
    private:
     friend std::string Message::DebugString() const;
     friend std::string Message::ShortDebugString() const;
     friend std::string Message::Utf8DebugString() const;
     friend std::string internal::StringifyMessage(
         const Message& message, internal::Option option,
         internal::FieldReporterLevel reporter_level, bool enable_safe_format);
 
     // Sets whether silent markers will be inserted.
     void SetInsertSilentMarker(bool v) { insert_silent_marker_ = v; }
 
     // Sets whether strings will be redacted and thus unparsable.
     void SetRedactDebugString(bool redact) { redact_debug_string_ = redact; }
 
     // Sets whether the output string should be made non-deterministic.
     // This discourages equality checks based on serialized string comparisons.
     void SetRandomizeDebugString(bool randomize) {
       randomize_debug_string_ = randomize;
     }
 
     // Forward declaration of an internal class used to print the text
     // output to the OutputStream (see text_format.cc for implementation).
     class TextGenerator;
     using MarkerToken = BaseTextGenerator::MarkerToken;
 
     // Forward declaration of an internal class used to print field values for
     // DebugString APIs (see text_format.cc for implementation).
     class DebugStringFieldValuePrinter;
 
     // Forward declaration of an internal class used to print UTF-8 escaped
     // strings (see text_format.cc for implementation).
     class FastFieldValuePrinterUtf8Escaping;
 
     // Internal Print method, used for writing to the OutputStream via
     // the TextGenerator class.
     void Print(const Message& message, BaseTextGenerator* generator) const;
 
     // Print a single field.
     void PrintField(const Message& message, const Reflection* reflection,
                     const FieldDescriptor* field,
                     BaseTextGenerator* generator) const;
 
     // Print a repeated primitive field in short form.
     void PrintShortRepeatedField(const Message& message,
                                  const Reflection* reflection,
                                  const FieldDescriptor* field,
                                  BaseTextGenerator* generator) const;
 
     // Print the name of a field -- i.e. everything that comes before the
     // ':' for a single name/value pair.
     void PrintFieldName(const Message& message, int field_index,
                         int field_count, const Reflection* reflection,
                         const FieldDescriptor* field,
                         BaseTextGenerator* generator) const;
 
     // Outputs a textual representation of the value of the field supplied on
     // the message supplied or the default value if not set.
     void PrintFieldValue(const Message& message, const Reflection* reflection,
                          const FieldDescriptor* field, int index,
                          BaseTextGenerator* generator) const;
 
     // Print the fields in an UnknownFieldSet.  They are printed by tag number
     // only.  Embedded messages are heuristically identified by attempting to
     // parse them (subject to the recursion budget).
     void PrintUnknownFields(const UnknownFieldSet& unknown_fields,
                             BaseTextGenerator* generator,
                             int recursion_budget) const;
 
     bool PrintAny(const Message& message, BaseTextGenerator* generator) const;
 
     // Try to redact a field value based on the annotations associated with
     // the field. This function returns true if it redacts the field value.
     bool TryRedactFieldValue(const Message& message,
                              const FieldDescriptor* field,
                              BaseTextGenerator* generator,
                              bool insert_value_separator) const;
 
     const FastFieldValuePrinter* GetFieldPrinter(
         const FieldDescriptor* field) const {
       auto it = custom_printers_.find(field);
       return it == custom_printers_.end() ? default_field_value_printer_.get()
                                           : it->second.get();
     }
 
     friend class google::protobuf::python::cmessage::PythonFieldValuePrinter;
     static void HardenedPrintString(absl::string_view src,
                                     TextFormat::BaseTextGenerator* generator);
 
     int initial_indent_level_;
     bool single_line_mode_;
     bool use_field_number_;
     bool use_short_repeated_primitives_;
     bool insert_silent_marker_;
     bool redact_debug_string_;
     bool randomize_debug_string_;
     internal::FieldReporterLevel report_sensitive_fields_;
     bool hide_unknown_fields_;
     bool print_message_fields_in_index_order_;
     bool expand_any_;
     int64_t truncate_string_field_longer_than_;
 
     std::unique_ptr<const FastFieldValuePrinter> default_field_value_printer_;
     absl::flat_hash_map<const FieldDescriptor*,
                         std::unique_ptr<const FastFieldValuePrinter>>
         custom_printers_;
 
     absl::flat_hash_map<const Descriptor*,
                         std::unique_ptr<const MessagePrinter>>
         custom_message_printers_;
 
     const Finder* finder_;
   };
 
   // Parses a text-format protocol message from the given input stream to
   // the given message object. This function parses the human-readable
   // serialization format written by Print(). Returns true on success. The
   // message is cleared first, even if the function fails -- See Merge() to
   // avoid this behavior.
   //
   // Example input: "user {\n id: 123 extra { gender: MALE language: 'en' }\n}"
   //
   // One common use for this function is parsing handwritten strings in test
   // code.
   //
   // If you would like to read a protocol buffer serialized in the
   // (non-human-readable) binary wire format, see
   // google::protobuf::MessageLite::ParseFromString().
   static bool Parse(io::ZeroCopyInputStream* input, Message* output);
   // Like Parse(), but reads directly from a string.
   static bool ParseFromString(absl::string_view input, Message* output);
   // Like Parse(), but reads directly from a Cord.
   static bool ParseFromCord(const absl::Cord& input, Message* output);
 
   // Like Parse(), but the data is merged into the given message, as if
   // using Message::MergeFrom().
   static bool Merge(io::ZeroCopyInputStream* input, Message* output);
   // Like Merge(), but reads directly from a string.
   static bool MergeFromString(absl::string_view input, Message* output);
 
   // Parse the given text as a single field value and store it into the
   // given field of the given message. If the field is a repeated field,
   // the new value will be added to the end
   static bool ParseFieldValueFromString(absl::string_view input,
                                         const FieldDescriptor* field,
                                         Message* message);
 
   // A location in the parsed text.
   struct ParseLocation {
     int line;
     int column;
 
     ParseLocation() : line(-1), column(-1) {}
     ParseLocation(int line_param, int column_param)
         : line(line_param), column(column_param) {}
   };
 
   // A range of locations in the parsed text, including `start` and excluding
   // `end`.
   struct ParseLocationRange {
     ParseLocation start;
     ParseLocation end;
     ParseLocationRange() : start(), end() {}
     ParseLocationRange(ParseLocation start_param, ParseLocation end_param)
         : start(start_param), end(end_param) {}
   };
 
   // Data structure which is populated with the locations of each field
   // value parsed from the text.
   class PROTOBUF_EXPORT ParseInfoTree {
    public:
     ParseInfoTree() = default;
     ParseInfoTree(const ParseInfoTree&) = delete;
     ParseInfoTree& operator=(const ParseInfoTree&) = delete;
 
     // Returns the parse location range for index-th value of the field in
     // the parsed text. If none exists, returns a location with start and end
     // line -1. Index should be -1 for not-repeated fields.
     ParseLocationRange GetLocationRange(const FieldDescriptor* field,
                                         int index) const;
 
     // Returns the starting parse location for index-th value of the field in
     // the parsed text. If none exists, returns a location with line = -1. Index
     // should be -1 for not-repeated fields.
     ParseLocation GetLocation(const FieldDescriptor* field, int index) const {
       return GetLocationRange(field, index).start;
     }
 
     // Returns the parse info tree for the given field, which must be a message
     // type. The nested information tree is owned by the root tree and will be
     // deleted when it is deleted.
     ParseInfoTree* GetTreeForNested(const FieldDescriptor* field,
                                     int index) const;
 
    private:
     // Allow the text format parser to record information into the tree.
     friend class TextFormat;
 
     // Records the starting and ending locations of a single value for a field.
     void RecordLocation(const FieldDescriptor* field, ParseLocationRange range);
 
     // Create and records a nested tree for a nested message field.
     ParseInfoTree* CreateNested(const FieldDescriptor* field);
 
     // Defines the map from the index-th field descriptor to its parse location.
     absl::flat_hash_map<const FieldDescriptor*, std::vector<ParseLocationRange>>
         locations_;
     // Defines the map from the index-th field descriptor to the nested parse
     // info tree.
     absl::flat_hash_map<const FieldDescriptor*,
                         std::vector<std::unique_ptr<ParseInfoTree>>>
         nested_;
   };
 
   // For more control over parsing, use this class.
   class PROTOBUF_EXPORT Parser {
    public:
     Parser();
     ~Parser();
 
     // Like TextFormat::Parse().
     bool Parse(io::ZeroCopyInputStream* input, Message* output);
     // Like TextFormat::ParseFromString().
     bool ParseFromString(absl::string_view input, Message* output);
     // Like TextFormat::ParseFromCord().
     bool ParseFromCord(const absl::Cord& input, Message* output);
     // Like TextFormat::Merge().
     bool Merge(io::ZeroCopyInputStream* input, Message* output);
     // Like TextFormat::MergeFromString().
     bool MergeFromString(absl::string_view input, Message* output);
 
     // Set where to report parse errors.  If nullptr (the default), errors will
     // be printed to stderr.
     void RecordErrorsTo(io::ErrorCollector* error_collector) {
       error_collector_ = error_collector;
     }
 
     // Set how parser finds extensions.  If nullptr (the default), the
     // parser will use the standard Reflection object associated with
     // the message being parsed.
     void SetFinder(const Finder* finder) { finder_ = finder; }
 
     // Sets where location information about the parse will be written. If
     // nullptr
     // (the default), then no location will be written.
     void WriteLocationsTo(ParseInfoTree* tree) { parse_info_tree_ = tree; }
 
     // Normally parsing fails if, after parsing, output->IsInitialized()
     // returns false.  Call AllowPartialMessage(true) to skip this check.
     void AllowPartialMessage(bool allow) { allow_partial_ = allow; }
 
     // Allow field names to be matched case-insensitively.
     // This is not advisable if there are fields that only differ in case, or
     // if you want to enforce writing in the canonical form.
     // This is 'false' by default.
     void AllowCaseInsensitiveField(bool allow) {
       allow_case_insensitive_field_ = allow;
     }
 
     // Like TextFormat::ParseFieldValueFromString
     bool ParseFieldValueFromString(absl::string_view input,
                                    const FieldDescriptor* field,
                                    Message* output);
 
     // When an unknown extension is met, parsing will fail if this option is
     // set to false (the default). If true, unknown extensions will be ignored
     // and a warning message will be generated.
     // Beware! Setting this option true may hide some errors (e.g. spelling
     // error on extension name).  This allows data loss; unlike binary format,
     // text format cannot preserve unknown extensions.  Avoid using this option
     // if possible.
     void AllowUnknownExtension(bool allow) { allow_unknown_extension_ = allow; }
 
     // When an unknown field is met, parsing will fail if this option is set
     // to false (the default). If true, unknown fields will be ignored and
     // a warning message will be generated.
     // Beware! Setting this option true may hide some errors (e.g. spelling
     // error on field name). This allows data loss; unlike binary format, text
     // format cannot preserve unknown fields.  Avoid using this option
     // if possible.
     void AllowUnknownField(bool allow) { allow_unknown_field_ = allow; }
 
 
     void AllowFieldNumber(bool allow) { allow_field_number_ = allow; }
 
     // Sets maximum recursion depth which parser can use. This is effectively
     // the maximum allowed nesting of proto messages.
     void SetRecursionLimit(int limit) { recursion_limit_ = limit; }
 
     // Metadata representing all the fields that were explicitly unset in
     // textproto. Example:
     // "some_int_field: 0"
     // where some_int_field has implicit presence.
     //
     // This class should only be used to pass data between TextFormat and the
     // MessageDifferencer.
     class UnsetFieldsMetadata {
      public:
       UnsetFieldsMetadata() = default;
 
      private:
       using Id = std::pair<const Message*, const FieldDescriptor*>;
       // Return an id representing the unset field in the given message.
       static Id GetUnsetFieldId(const Message& message,
                                 const FieldDescriptor& fd);
 
       // List of ids of explicitly unset proto fields.
       absl::flat_hash_set<Id> ids_;
 
       friend class ::google::protobuf::internal::
           UnsetFieldsMetadataMessageDifferencerTestUtil;
       friend class ::google::protobuf::internal::UnsetFieldsMetadataTextFormatTestUtil;
       friend class ::google::protobuf::util::MessageDifferencer;
       friend class ::google::protobuf::TextFormat::Parser;
     };
 
     // If called, the parser will report the parsed fields that had no
     // effect on the resulting proto (for example, fields with no presence that
     // were set to their default value). These can be passed to the Partially()
     // matcher as an indicator to explicitly check these fields are missing
     // in the actual.
     void OutputNoOpFields(UnsetFieldsMetadata* no_op_fields) {
       no_op_fields_ = no_op_fields;
     }
 
    private:
     // Forward declaration of an internal class used to parse text
     // representations (see text_format.cc for implementation).
     class ParserImpl;
 
     // Like TextFormat::Merge().  The provided implementation is used
     // to do the parsing.
     bool MergeUsingImpl(io::ZeroCopyInputStream* input, Message* output,
                         ParserImpl* parser_impl);
 
     io::ErrorCollector* error_collector_;
     const Finder* finder_;
     ParseInfoTree* parse_info_tree_;
     bool allow_partial_;
     bool allow_case_insensitive_field_;
     bool allow_unknown_field_;
     bool allow_unknown_extension_;
     bool allow_unknown_enum_;
     bool allow_field_number_;
     bool allow_relaxed_whitespace_;
     bool allow_singular_overwrites_;
     int recursion_limit_;
     UnsetFieldsMetadata* no_op_fields_ = nullptr;
   };
 
 
  private:
   // Hack: ParseInfoTree declares TextFormat as a friend which should extend
   // the friendship to TextFormat::Parser::ParserImpl, but unfortunately some
   // old compilers (e.g. GCC 3.4.6) don't implement this correctly. We provide
   // helpers for ParserImpl to call methods of ParseInfoTree.
   static inline void RecordLocation(ParseInfoTree* info_tree,
                                     const FieldDescriptor* field,
                                     ParseLocationRange location);
   static inline ParseInfoTree* CreateNested(ParseInfoTree* info_tree,
                                             const FieldDescriptor* field);
   // To reduce stack frame bloat we use an out-of-line function to print
   // strings. This avoid local std::string temporaries.
   template <typename... T>
   static void OutOfLinePrintString(BaseTextGenerator* generator,
                                    const T&... values);
 };
 
 
 inline void TextFormat::RecordLocation(ParseInfoTree* info_tree,
                                        const FieldDescriptor* field,
                                        ParseLocationRange location) {
   info_tree->RecordLocation(field, location);
 }
 
 inline TextFormat::ParseInfoTree* TextFormat::CreateNested(
     ParseInfoTree* info_tree, const FieldDescriptor* field) {
   return info_tree->CreateNested(field);
 }
 
 }  // namespace protobuf
 }  // namespace google
 
 #include "google/protobuf/port_undef.inc"
 
 #endif  // GOOGLE_PROTOBUF_TEXT_FORMAT_H__

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