objectivec/GPBDescriptor.h

// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
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#import <Foundation/Foundation.h>

#import "GPBRuntimeTypes.h"

@class GPBEnumDescriptor;
@class GPBFieldDescriptor;
@class GPBFileDescriptor;
@class GPBOneofDescriptor;

NS_ASSUME_NONNULL_BEGIN

typedef NS_ENUM(uint8_t, GPBFileSyntax) {
  GPBFileSyntaxUnknown = 0,
  GPBFileSyntaxProto2 = 2,
  GPBFileSyntaxProto3 = 3,
};

typedef NS_ENUM(uint8_t, 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<GPBFieldDescriptor*> *fields;
@property(nonatomic, readonly, strong, nullable) NSArray<GPBOneofDescriptor*> *oneofs;
@property(nonatomic, readonly, nullable) const GPBExtensionRange *extensionRanges;
@property(nonatomic, readonly) uint32_t 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;

@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<GPBFieldDescriptor*> *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;

// 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