Revert https://codereview.chromium.org/1291903002 (protobuf roll).

third_party/protobuf/objectivec/GPBDescriptor.h

-// 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.
-
-#import <Foundation/Foundation.h>
-
-#import "GPBRuntimeTypes.h"
-
-@class GPBEnumDescriptor;
-@class GPBFieldDescriptor;
-@class GPBFieldOptions;
-@class GPBFileDescriptor;
-@class GPBOneofDescriptor;
-
-NS_ASSUME_NONNULL_BEGIN
-
-typedef NS_ENUM(NSInteger, GPBFileSyntax) {
-  GPBFileSyntaxUnknown = 0,
-  GPBFileSyntaxProto2 = 2,
-  GPBFileSyntaxProto3 = 3,
-};
-
-typedef NS_ENUM(NSInteger, GPBFieldType) {
-  GPBFieldTypeSingle,    // optional/required
-  GPBFieldTypeRepeated,  // repeated
-  GPBFieldTypeMap,       // map<K,V>
-};
-
-@interface GPBDescriptor : NSObject<NSCopying>
-
-@property(nonatomic, readonly, copy) NSString *name;
-@property(nonatomic, readonly, strong, nullable) NSArray *fields;
-@property(nonatomic, readonly, strong, nullable) NSArray *oneofs;
-@property(nonatomic, readonly, strong, nullable) NSArray *enums;
-@property(nonatomic, readonly, nullable) const GPBExtensionRange *extensionRanges;
-@property(nonatomic, readonly) NSUInteger extensionRangesCount;
-@property(nonatomic, readonly, assign) GPBFileDescriptor *file;
-
-@property(nonatomic, readonly, getter=isWireFormat) BOOL wireFormat;
-@property(nonatomic, readonly) Class messageClass;
-
-- (nullable GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber;
-- (nullable GPBFieldDescriptor *)fieldWithName:(NSString *)name;
-- (nullable GPBOneofDescriptor *)oneofWithName:(NSString *)name;
-- (nullable GPBEnumDescriptor *)enumWithName:(NSString *)name;
-
-@end
-
-@interface GPBFileDescriptor : NSObject
-
-@property(nonatomic, readonly, copy) NSString *package;
-@property(nonatomic, readonly) GPBFileSyntax syntax;
-
-@end
-
-@interface GPBOneofDescriptor : NSObject
-@property(nonatomic, readonly) NSString *name;
-@property(nonatomic, readonly) NSArray *fields;
-
-- (nullable GPBFieldDescriptor *)fieldWithNumber:(uint32_t)fieldNumber;
-- (nullable GPBFieldDescriptor *)fieldWithName:(NSString *)name;
-@end
-
-@interface GPBFieldDescriptor : NSObject
-
-@property(nonatomic, readonly, copy) NSString *name;
-@property(nonatomic, readonly) uint32_t number;
-@property(nonatomic, readonly) GPBDataType dataType;
-@property(nonatomic, readonly) BOOL hasDefaultValue;
-@property(nonatomic, readonly) GPBGenericValue defaultValue;
-@property(nonatomic, readonly, getter=isRequired) BOOL required;
-@property(nonatomic, readonly, getter=isOptional) BOOL optional;
-@property(nonatomic, readonly) GPBFieldType fieldType;
-// If it is a map, the value type is in -type.
-@property(nonatomic, readonly) GPBDataType mapKeyDataType;
-@property(nonatomic, readonly, getter=isPackable) BOOL packable;
-
-@property(nonatomic, readonly, assign, nullable) GPBOneofDescriptor *containingOneof;
-
-@property(nonatomic, readonly, nullable) GPBFieldOptions *fieldOptions;
-
-// Message properties
-@property(nonatomic, readonly, assign, nullable) Class msgClass;
-
-// Enum properties
-@property(nonatomic, readonly, strong, nullable) GPBEnumDescriptor *enumDescriptor;
-
-- (BOOL)isValidEnumValue:(int32_t)value;
-
-// For now, this will return nil if it doesn't know the name to use for
-// TextFormat.
-- (nullable NSString *)textFormatName;
-
-@end
-
-@interface GPBEnumDescriptor : NSObject
-
-@property(nonatomic, readonly, copy) NSString *name;
-@property(nonatomic, readonly) GPBEnumValidationFunc enumVerifier;
-
-- (nullable NSString *)enumNameForValue:(int32_t)number;
-- (BOOL)getValue:(nullable int32_t *)outValue forEnumName:(NSString *)name;
-
-- (nullable NSString *)textFormatNameForValue:(int32_t)number;
-
-@end
-
-@interface GPBExtensionDescriptor : NSObject<NSCopying>
-@property(nonatomic, readonly) uint32_t fieldNumber;
-@property(nonatomic, readonly) Class containingMessageClass;
-@property(nonatomic, readonly) GPBDataType dataType;
-@property(nonatomic, readonly, getter=isRepeated) BOOL repeated;
-@property(nonatomic, readonly, getter=isPackable) BOOL packable;
-@property(nonatomic, readonly, assign) Class msgClass;
-@property(nonatomic, readonly) NSString *singletonName;
-@property(nonatomic, readonly, strong, nullable) GPBEnumDescriptor *enumDescriptor;
-@property(nonatomic, readonly) id defaultValue;
-@end
-
-NS_ASSUME_NONNULL_END