aboutsummaryrefslogtreecommitdiffstats
path: root/contrib/libs/protoc/src/google/protobuf/compiler/parser.h
blob: 0a1bfc6827dd379546f012045e47cd28f6a15f85 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
// 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(arc_ui64 max_value, arc_ui64* 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<arc_i32>* public_dependency,
                   RepeatedField<arc_i32>* 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__