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// Protocol Buffers - Google's data interchange format 
// Copyright 2008 Google Inc.  All rights reserved. 
// https://developers.google.com/protocol-buffers/ 
// 
// Redistribution and use in source and binary forms, with or without 
// modification, are permitted provided that the following conditions are 
// met: 
// 
//     * Redistributions of source code must retain the above copyright 
// notice, this list of conditions and the following disclaimer. 
//     * Redistributions in binary form must reproduce the above 
// copyright notice, this list of conditions and the following disclaimer 
// in the documentation and/or other materials provided with the 
// distribution. 
//     * Neither the name of Google Inc. nor the names of its 
// contributors may be used to endorse or promote products derived from 
// this software without specific prior written permission. 
// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 
// Author: kenton@google.com (Kenton Varda) 
//  Based on original Protocol Buffers design by 
//  Sanjay Ghemawat, Jeff Dean, and others. 
// 
// Implements parsing of .proto files to FileDescriptorProtos. 
 
#ifndef GOOGLE_PROTOBUF_COMPILER_PARSER_H__ 
#define GOOGLE_PROTOBUF_COMPILER_PARSER_H__ 
 
#include <cstdint>
#include <map> 
#include <string>
#include <utility> 

#include <google/protobuf/descriptor.pb.h>
#include <google/protobuf/io/tokenizer.h>
#include <google/protobuf/descriptor.h>
#include <google/protobuf/repeated_field.h>
 
// Must be included last.
#include <google/protobuf/port_def.inc>

namespace google { 
namespace protobuf {
 
class Message;

namespace compiler { 
 
// Defined in this file. 
class Parser; 
class SourceLocationTable; 
 
// Implements parsing of protocol definitions (such as .proto files). 
// 
// Note that most users will be more interested in the Importer class. 
// Parser is a lower-level class which simply converts a single .proto file 
// to a FileDescriptorProto.  It does not resolve import directives or perform 
// many other kinds of validation needed to construct a complete 
// FileDescriptor. 
class PROTOBUF_EXPORT Parser {
 public: 
  Parser(); 
  ~Parser(); 
 
  // Parse the entire input and construct a FileDescriptorProto representing 
  // it.  Returns true if no errors occurred, false otherwise. 
  bool Parse(io::Tokenizer* input, FileDescriptorProto* file); 
 
  // Optional features: 
 
  // DEPRECATED:  New code should use the SourceCodeInfo embedded in the 
  //   FileDescriptorProto. 
  // 
  // Requests that locations of certain definitions be recorded to the given 
  // SourceLocationTable while parsing.  This can be used to look up exact line 
  // and column numbers for errors reported by DescriptorPool during validation. 
  // Set to NULL (the default) to discard source location information. 
  void RecordSourceLocationsTo(SourceLocationTable* location_table) { 
    source_location_table_ = location_table; 
  } 
 
  // Requests that errors be recorded to the given ErrorCollector while 
  // parsing.  Set to NULL (the default) to discard error messages. 
  void RecordErrorsTo(io::ErrorCollector* error_collector) { 
    error_collector_ = error_collector; 
  } 
 
  // Returns the identifier used in the "syntax = " declaration, if one was 
  // seen during the last call to Parse(), or the empty string otherwise. 
  const TProtoStringType& GetSyntaxIdentifier() { return syntax_identifier_; }
 
  // If set true, input files will be required to begin with a syntax 
  // identifier.  Otherwise, files may omit this.  If a syntax identifier 
  // is provided, it must be 'syntax = "proto2";' and must appear at the 
  // top of this file regardless of whether or not it was required. 
  void SetRequireSyntaxIdentifier(bool value) { 
    require_syntax_identifier_ = value; 
  } 
 
  // Call SetStopAfterSyntaxIdentifier(true) to tell the parser to stop 
  // parsing as soon as it has seen the syntax identifier, or lack thereof. 
  // This is useful for quickly identifying the syntax of the file without 
  // parsing the whole thing.  If this is enabled, no error will be recorded 
  // if the syntax identifier is something other than "proto2" (since 
  // presumably the caller intends to deal with that), but other kinds of 
  // errors (e.g. parse errors) will still be reported.  When this is enabled, 
  // you may pass a NULL FileDescriptorProto to Parse(). 
  void SetStopAfterSyntaxIdentifier(bool value) { 
    stop_after_syntax_identifier_ = value; 
  } 
 
 private: 
  class LocationRecorder; 
 
  // ================================================================= 
  // Error recovery helpers 
 
  // Consume the rest of the current statement.  This consumes tokens 
  // until it sees one of: 
  //   ';'  Consumes the token and returns. 
  //   '{'  Consumes the brace then calls SkipRestOfBlock(). 
  //   '}'  Returns without consuming. 
  //   EOF  Returns (can't consume). 
  // The Parser often calls SkipStatement() after encountering a syntax 
  // error.  This allows it to go on parsing the following lines, allowing 
  // it to report more than just one error in the file. 
  void SkipStatement(); 
 
  // Consume the rest of the current block, including nested blocks, 
  // ending after the closing '}' is encountered and consumed, or at EOF. 
  void SkipRestOfBlock(); 
 
  // ----------------------------------------------------------------- 
  // Single-token consuming helpers 
  // 
  // These make parsing code more readable. 
 
  // True if the current token is TYPE_END. 
  inline bool AtEnd(); 
 
  // True if the next token matches the given text. 
  inline bool LookingAt(const char* text); 
  // True if the next token is of the given type. 
  inline bool LookingAtType(io::Tokenizer::TokenType token_type); 
 
  // If the next token exactly matches the text given, consume it and return 
  // true.  Otherwise, return false without logging an error. 
  bool TryConsume(const char* text); 
 
  // These attempt to read some kind of token from the input.  If successful, 
  // they return true.  Otherwise they return false and add the given error 
  // to the error list. 
 
  // Consume a token with the exact text given. 
  bool Consume(const char* text, const char* error); 
  // Same as above, but automatically generates the error "Expected \"text\".", 
  // where "text" is the expected token text. 
  bool Consume(const char* text); 
  // Consume a token of type IDENTIFIER and store its text in "output". 
  bool ConsumeIdentifier(TProtoStringType* output, const char* error);
  // Consume an integer and store its value in "output". 
  bool ConsumeInteger(int* output, const char* error); 
  // Consume a signed integer and store its value in "output". 
  bool ConsumeSignedInteger(int* output, const char* error); 
  // Consume a 64-bit integer and store its value in "output".  If the value 
  // is greater than max_value, an error will be reported. 
  bool ConsumeInteger64(uint64_t max_value, uint64_t* output,
                        const char* error);
  // Consume a number and store its value in "output".  This will accept 
  // tokens of either INTEGER or FLOAT type. 
  bool ConsumeNumber(double* output, const char* error); 
  // Consume a string literal and store its (unescaped) value in "output". 
  bool ConsumeString(TProtoStringType* output, const char* error);
 
  // Consume a token representing the end of the statement.  Comments between 
  // this token and the next will be harvested for documentation.  The given 
  // LocationRecorder should refer to the declaration that was just parsed; 
  // it will be populated with these comments. 
  // 
  // TODO(kenton):  The LocationRecorder is const because historically locations 
  //   have been passed around by const reference, for no particularly good 
  //   reason.  We should probably go through and change them all to mutable 
  //   pointer to make this more intuitive. 
  bool TryConsumeEndOfDeclaration(const char* text,
                                  const LocationRecorder* location);
  bool TryConsumeEndOfDeclarationFinishScope(const char* text,
                                             const LocationRecorder* location);
 
  bool ConsumeEndOfDeclaration(const char* text,
                               const LocationRecorder* location);
 
  // ----------------------------------------------------------------- 
  // Error logging helpers 
 
  // Invokes error_collector_->AddError(), if error_collector_ is not NULL. 
  void AddError(int line, int column, const TProtoStringType& error);
 
  // Invokes error_collector_->AddError() with the line and column number 
  // of the current token. 
  void AddError(const TProtoStringType& error);
 
  // Invokes error_collector_->AddWarning() with the line and column number
  // of the current token.
  void AddWarning(const TProtoStringType& warning);

  // Records a location in the SourceCodeInfo.location table (see 
  // descriptor.proto).  We use RAII to ensure that the start and end locations 
  // are recorded -- the constructor records the start location and the 
  // destructor records the end location.  Since the parser is 
  // recursive-descent, this works out beautifully. 
  class PROTOBUF_EXPORT LocationRecorder {
   public: 
    // Construct the file's "root" location. 
    LocationRecorder(Parser* parser); 
 
    // Construct a location that represents a declaration nested within the 
    // given parent.  E.g. a field's location is nested within the location 
    // for a message type.  The parent's path will be copied, so you should 
    // call AddPath() only to add the path components leading from the parent 
    // to the child (as opposed to leading from the root to the child). 
    LocationRecorder(const LocationRecorder& parent); 
 
    // Convenience constructors that call AddPath() one or two times. 
    LocationRecorder(const LocationRecorder& parent, int path1); 
    LocationRecorder(const LocationRecorder& parent, int path1, int path2); 
 
    // Creates a recorder that generates locations into given source code info.
    LocationRecorder(const LocationRecorder& parent, int path1,
                     SourceCodeInfo* source_code_info);

    ~LocationRecorder(); 
 
    // Add a path component.  See SourceCodeInfo.Location.path in 
    // descriptor.proto. 
    void AddPath(int path_component); 
 
    // By default the location is considered to start at the current token at 
    // the time the LocationRecorder is created.  StartAt() sets the start 
    // location to the given token instead. 
    void StartAt(const io::Tokenizer::Token& token); 
 
    // Start at the same location as some other LocationRecorder. 
    void StartAt(const LocationRecorder& other); 
 
    // By default the location is considered to end at the previous token at 
    // the time the LocationRecorder is destroyed.  EndAt() sets the end 
    // location to the given token instead. 
    void EndAt(const io::Tokenizer::Token& token); 
 
    // Records the start point of this location to the SourceLocationTable that 
    // was passed to RecordSourceLocationsTo(), if any.  SourceLocationTable 
    // is an older way of keeping track of source locations which is still 
    // used in some places. 
    void RecordLegacyLocation(
        const Message* descriptor,
        DescriptorPool::ErrorCollector::ErrorLocation location); 
    void RecordLegacyImportLocation(const Message* descriptor,
                                    const TProtoStringType& name);
 
    // Returns the number of path components in the recorder's current location.
    int CurrentPathSize() const;

    // Attaches leading and trailing comments to the location.  The two strings 
    // will be swapped into place, so after this is called *leading and 
    // *trailing will be empty. 
    // 
    // TODO(kenton):  See comment on TryConsumeEndOfDeclaration(), above, for 
    //   why this is const. 
    void AttachComments(TProtoStringType* leading, TProtoStringType* trailing,
                        std::vector<TProtoStringType>* detached_comments) const;
 
   private: 
    // Indexes of parent and current location in the parent 
    // SourceCodeInfo.location repeated field. For top-level elements, 
    // parent_index_ is -1. 
    Parser* parser_; 
    SourceCodeInfo* source_code_info_;
    SourceCodeInfo::Location* location_; 
 
    void Init(const LocationRecorder& parent, SourceCodeInfo* source_code_info);
  }; 
 
  // ================================================================= 
  // Parsers for various language constructs 
 
  // Parses the "syntax = \"proto2\";" line at the top of the file.  Returns 
  // false if it failed to parse or if the syntax identifier was not 
  // recognized. 
  bool ParseSyntaxIdentifier(const LocationRecorder& parent); 
 
  // These methods parse various individual bits of code.  They return 
  // false if they completely fail to parse the construct.  In this case, 
  // it is probably necessary to skip the rest of the statement to recover. 
  // However, if these methods return true, it does NOT mean that there 
  // were no errors; only that there were no *syntax* errors.  For instance, 
  // if a service method is defined using proper syntax but uses a primitive 
  // type as its input or output, ParseMethodField() still returns true 
  // and only reports the error by calling AddError().  In practice, this 
  // makes logic much simpler for the caller. 
 
  // Parse a top-level message, enum, service, etc. 
  bool ParseTopLevelStatement(FileDescriptorProto* file, 
                              const LocationRecorder& root_location); 
 
  // Parse various language high-level language construrcts. 
  bool ParseMessageDefinition(DescriptorProto* message, 
                              const LocationRecorder& message_location, 
                              const FileDescriptorProto* containing_file); 
  bool ParseEnumDefinition(EnumDescriptorProto* enum_type, 
                           const LocationRecorder& enum_location, 
                           const FileDescriptorProto* containing_file); 
  bool ParseServiceDefinition(ServiceDescriptorProto* service, 
                              const LocationRecorder& service_location, 
                              const FileDescriptorProto* containing_file); 
  bool ParsePackage(FileDescriptorProto* file, 
                    const LocationRecorder& root_location, 
                    const FileDescriptorProto* containing_file); 
  bool ParseImport(RepeatedPtrField<TProtoStringType>* dependency,
                   RepeatedField<int32_t>* public_dependency,
                   RepeatedField<int32_t>* weak_dependency,
                   const LocationRecorder& root_location, 
                   const FileDescriptorProto* containing_file); 
 
  // These methods parse the contents of a message, enum, or service type and 
  // add them to the given object.  They consume the entire block including 
  // the beginning and ending brace. 
  bool ParseMessageBlock(DescriptorProto* message, 
                         const LocationRecorder& message_location, 
                         const FileDescriptorProto* containing_file); 
  bool ParseEnumBlock(EnumDescriptorProto* enum_type, 
                      const LocationRecorder& enum_location, 
                      const FileDescriptorProto* containing_file); 
  bool ParseServiceBlock(ServiceDescriptorProto* service, 
                         const LocationRecorder& service_location, 
                         const FileDescriptorProto* containing_file); 
 
  // Parse one statement within a message, enum, or service block, including 
  // final semicolon. 
  bool ParseMessageStatement(DescriptorProto* message, 
                             const LocationRecorder& message_location, 
                             const FileDescriptorProto* containing_file); 
  bool ParseEnumStatement(EnumDescriptorProto* message, 
                          const LocationRecorder& enum_location, 
                          const FileDescriptorProto* containing_file); 
  bool ParseServiceStatement(ServiceDescriptorProto* message, 
                             const LocationRecorder& service_location, 
                             const FileDescriptorProto* containing_file); 
 
  // Parse a field of a message.  If the field is a group, its type will be 
  // added to "messages". 
  // 
  // parent_location and location_field_number_for_nested_type are needed when 
  // parsing groups -- we need to generate a nested message type within the 
  // parent and record its location accordingly.  Since the parent could be 
  // either a FileDescriptorProto or a DescriptorProto, we must pass in the 
  // correct field number to use. 
  bool ParseMessageField(FieldDescriptorProto* field, 
                         RepeatedPtrField<DescriptorProto>* messages, 
                         const LocationRecorder& parent_location, 
                         int location_field_number_for_nested_type, 
                         const LocationRecorder& field_location, 
                         const FileDescriptorProto* containing_file); 
 
  // Like ParseMessageField() but expects the label has already been filled in 
  // by the caller. 
  bool ParseMessageFieldNoLabel(FieldDescriptorProto* field, 
                                RepeatedPtrField<DescriptorProto>* messages, 
                                const LocationRecorder& parent_location, 
                                int location_field_number_for_nested_type, 
                                const LocationRecorder& field_location, 
                                const FileDescriptorProto* containing_file); 
 
  // Parse an "extensions" declaration. 
  bool ParseExtensions(DescriptorProto* message, 
                       const LocationRecorder& extensions_location, 
                       const FileDescriptorProto* containing_file); 
 
  // Parse a "reserved" declaration. 
  bool ParseReserved(DescriptorProto* message, 
                     const LocationRecorder& message_location); 
  bool ParseReservedNames(DescriptorProto* message, 
                          const LocationRecorder& parent_location); 
  bool ParseReservedNumbers(DescriptorProto* message, 
                            const LocationRecorder& parent_location); 
  bool ParseReserved(EnumDescriptorProto* message,
                     const LocationRecorder& message_location);
  bool ParseReservedNames(EnumDescriptorProto* message,
                          const LocationRecorder& parent_location);
  bool ParseReservedNumbers(EnumDescriptorProto* message,
                            const LocationRecorder& parent_location);
 
  // Parse an "extend" declaration.  (See also comments for 
  // ParseMessageField().) 
  bool ParseExtend(RepeatedPtrField<FieldDescriptorProto>* extensions, 
                   RepeatedPtrField<DescriptorProto>* messages, 
                   const LocationRecorder& parent_location, 
                   int location_field_number_for_nested_type, 
                   const LocationRecorder& extend_location, 
                   const FileDescriptorProto* containing_file); 
 
  // Parse a "oneof" declaration.  The caller is responsible for setting 
  // oneof_decl->label() since it will have had to parse the label before it 
  // knew it was parsing a oneof. 
  bool ParseOneof(OneofDescriptorProto* oneof_decl, 
                  DescriptorProto* containing_type, int oneof_index,
                  const LocationRecorder& oneof_location, 
                  const LocationRecorder& containing_type_location, 
                  const FileDescriptorProto* containing_file); 
 
  // Parse a single enum value within an enum block. 
  bool ParseEnumConstant(EnumValueDescriptorProto* enum_value, 
                         const LocationRecorder& enum_value_location, 
                         const FileDescriptorProto* containing_file); 
 
  // Parse enum constant options, i.e. the list in square brackets at the end 
  // of the enum constant value definition. 
  bool ParseEnumConstantOptions(EnumValueDescriptorProto* value, 
                                const LocationRecorder& enum_value_location, 
                                const FileDescriptorProto* containing_file); 
 
  // Parse a single method within a service definition. 
  bool ParseServiceMethod(MethodDescriptorProto* method, 
                          const LocationRecorder& method_location, 
                          const FileDescriptorProto* containing_file); 
 
 
  // Parse options of a single method or stream. 
  bool ParseMethodOptions(const LocationRecorder& parent_location, 
                          const FileDescriptorProto* containing_file, 
                          const int optionsFieldNumber, 
                          Message* mutable_options); 
 
  // Parse "required", "optional", or "repeated" and fill in "label" 
  // with the value. Returns true if such a label is consumed. 
  bool ParseLabel(FieldDescriptorProto::Label* label, 
                  const LocationRecorder& field_location,
                  const FileDescriptorProto* containing_file); 
 
  // Parse a type name and fill in "type" (if it is a primitive) or 
  // "type_name" (if it is not) with the type parsed. 
  bool ParseType(FieldDescriptorProto::Type* type, TProtoStringType* type_name);
  // Parse a user-defined type and fill in "type_name" with the name. 
  // If a primitive type is named, it is treated as an error. 
  bool ParseUserDefinedType(TProtoStringType* type_name);
 
  // Parses field options, i.e. the stuff in square brackets at the end 
  // of a field definition.  Also parses default value. 
  bool ParseFieldOptions(FieldDescriptorProto* field, 
                         const LocationRecorder& field_location, 
                         const FileDescriptorProto* containing_file); 
 
  // Parse the "default" option.  This needs special handling because its 
  // type is the field's type. 
  bool ParseDefaultAssignment(FieldDescriptorProto* field, 
                              const LocationRecorder& field_location, 
                              const FileDescriptorProto* containing_file); 
 
  bool ParseJsonName(FieldDescriptorProto* field, 
                     const LocationRecorder& field_location, 
                     const FileDescriptorProto* containing_file); 
 
  enum OptionStyle { 
    OPTION_ASSIGNMENT,  // just "name = value" 
    OPTION_STATEMENT    // "option name = value;" 
  }; 
 
  // Parse a single option name/value pair, e.g. "ctype = CORD".  The name 
  // identifies a field of the given Message, and the value of that field 
  // is set to the parsed value. 
  bool ParseOption(Message* options, const LocationRecorder& options_location,
                   const FileDescriptorProto* containing_file, 
                   OptionStyle style); 
 
  // Parses a single part of a multipart option name. A multipart name consists 
  // of names separated by dots. Each name is either an identifier or a series 
  // of identifiers separated by dots and enclosed in parentheses. E.g., 
  // "foo.(bar.baz).qux". 
  bool ParseOptionNamePart(UninterpretedOption* uninterpreted_option, 
                           const LocationRecorder& part_location, 
                           const FileDescriptorProto* containing_file); 
 
  // Parses a string surrounded by balanced braces.  Strips off the outer 
  // braces and stores the enclosed string in *value. 
  // E.g., 
  //     { foo }                     *value gets 'foo' 
  //     { foo { bar: box } }        *value gets 'foo { bar: box }' 
  //     {}                          *value gets '' 
  // 
  // REQUIRES: LookingAt("{") 
  // When finished successfully, we are looking at the first token past 
  // the ending brace. 
  bool ParseUninterpretedBlock(TProtoStringType* value);
 
  struct MapField { 
    // Whether the field is a map field. 
    bool is_map_field; 
    // The types of the key and value if they are primitive types. 
    FieldDescriptorProto::Type key_type; 
    FieldDescriptorProto::Type value_type; 
    // Or the type names string if the types are customized types. 
    TProtoStringType key_type_name;
    TProtoStringType value_type_name;
 
    MapField() : is_map_field(false) {} 
  }; 
  // Desugar the map syntax to generate a nested map entry message. 
  void GenerateMapEntry(const MapField& map_field, FieldDescriptorProto* field, 
                        RepeatedPtrField<DescriptorProto>* messages); 
 
  // Whether fields without label default to optional fields. 
  bool DefaultToOptionalFields() const { 
    return syntax_identifier_ == "proto3"; 
  } 
 
  bool ValidateEnum(const EnumDescriptorProto* proto); 
 
  // ================================================================= 
 
  io::Tokenizer* input_; 
  io::ErrorCollector* error_collector_; 
  SourceCodeInfo* source_code_info_; 
  SourceLocationTable* source_location_table_;  // legacy 
  bool had_errors_; 
  bool require_syntax_identifier_; 
  bool stop_after_syntax_identifier_; 
  TProtoStringType syntax_identifier_;
 
  // Leading doc comments for the next declaration.  These are not complete 
  // yet; use ConsumeEndOfDeclaration() to get the complete comments. 
  TProtoStringType upcoming_doc_comments_;
 
  // Detached comments are not connected to any syntax entities. Elements in 
  // this vector are paragraphs of comments separated by empty lines. The 
  // detached comments will be put into the leading_detached_comments field for 
  // the next element (See SourceCodeInfo.Location in descriptor.proto), when 
  // ConsumeEndOfDeclaration() is called. 
  std::vector<TProtoStringType> upcoming_detached_comments_;
 
  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(Parser); 
}; 
 
// A table mapping (descriptor, ErrorLocation) pairs -- as reported by 
// DescriptorPool when validating descriptors -- to line and column numbers 
// within the original source code. 
// 
// This is semi-obsolete:  FileDescriptorProto.source_code_info now contains 
// far more complete information about source locations.  However, as of this 
// writing you still need to use SourceLocationTable when integrating with 
// DescriptorPool. 
class PROTOBUF_EXPORT SourceLocationTable {
 public: 
  SourceLocationTable(); 
  ~SourceLocationTable(); 
 
  // Finds the precise location of the given error and fills in *line and 
  // *column with the line and column numbers.  If not found, sets *line to 
  // -1 and *column to 0 (since line = -1 is used to mean "error has no exact 
  // location" in the ErrorCollector interface).  Returns true if found, false 
  // otherwise. 
  bool Find(const Message* descriptor, 
            DescriptorPool::ErrorCollector::ErrorLocation location, int* line,
            int* column) const;
  bool FindImport(const Message* descriptor, const TProtoStringType& name, int* line,
                  int* column) const;
 
  // Adds a location to the table. 
  void Add(const Message* descriptor, 
           DescriptorPool::ErrorCollector::ErrorLocation location, int line,
           int column);
  void AddImport(const Message* descriptor, const TProtoStringType& name, int line,
                 int column);
 
  // Clears the contents of the table. 
  void Clear(); 
 
 private: 
  typedef std::map<
      std::pair<const Message*, DescriptorPool::ErrorCollector::ErrorLocation>,
      std::pair<int, int> >
      LocationMap;
  LocationMap location_map_; 
  std::map<std::pair<const Message*, TProtoStringType>, std::pair<int, int> >
      import_location_map_;
}; 
 
}  // namespace compiler 
}  // namespace protobuf 
}  // namespace google
 
#include <google/protobuf/port_undef.inc>

#endif  // GOOGLE_PROTOBUF_COMPILER_PARSER_H__