added files via upload

Tweaks/FLEX/Utility/Runtime/Objc/Reflection/FLEXProtocolBuilder.m

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+//
+//  FLEXProtocolBuilder.m
+//  FLEX
+//
+//  Derived from MirrorKit.
+//  Created by Tanner on 7/4/15.
+//  Copyright (c) 2020 FLEX Team. All rights reserved.
+//
+
+#import "FLEXProtocolBuilder.h"
+#import "FLEXProtocol.h"
+#import "FLEXProperty.h"
+#import <objc/runtime.h>
+
+#define MutationAssertion(msg) if (self.isRegistered) { \
+    [NSException \
+        raise:NSInternalInconsistencyException \
+        format:msg \
+    ]; \
+}
+
+@interface FLEXProtocolBuilder ()
+@property (nonatomic) Protocol *workingProtocol;
+@property (nonatomic) NSString *name;
+@end
+
+@implementation FLEXProtocolBuilder
+
+- (id)init {
+    [NSException
+        raise:NSInternalInconsistencyException
+        format:@"Class instance should not be created with -init"
+    ];
+    return nil;
+}
+
+#pragma mark Initializers
++ (instancetype)allocateProtocol:(NSString *)name {
+    NSParameterAssert(name);
+    return [[self alloc] initWithProtocol:objc_allocateProtocol(name.UTF8String)];
+    
+}
+
+- (id)initWithProtocol:(Protocol *)protocol {
+    NSParameterAssert(protocol);
+    
+    self = [super init];
+    if (self) {
+        _workingProtocol = protocol;
+        _name = NSStringFromProtocol(self.workingProtocol);
+    }
+    
+    return self;
+}
+
+- (NSString *)description {
+    return [NSString stringWithFormat:@"<%@ name=%@, registered=%d>",
+            NSStringFromClass(self.class), self.name, self.isRegistered];
+}
+
+#pragma mark Building
+
+- (void)addProperty:(FLEXProperty *)property isRequired:(BOOL)isRequired {
+    MutationAssertion(@"Properties cannot be added once a protocol has been registered");
+
+    unsigned int count;
+    objc_property_attribute_t *attributes = [property copyAttributesList:&count];
+    protocol_addProperty(self.workingProtocol, property.name.UTF8String, attributes, count, isRequired, YES);
+    free(attributes);
+}
+
+- (void)addMethod:(SEL)selector
+    typeEncoding:(NSString *)typeEncoding
+       isRequired:(BOOL)isRequired
+ isInstanceMethod:(BOOL)isInstanceMethod {
+    MutationAssertion(@"Methods cannot be added once a protocol has been registered");
+    protocol_addMethodDescription(self.workingProtocol, selector, typeEncoding.UTF8String, isRequired, isInstanceMethod);
+}
+
+- (void)addProtocol:(Protocol *)protocol {
+    MutationAssertion(@"Protocols cannot be added once a protocol has been registered");
+    protocol_addProtocol(self.workingProtocol, protocol);
+}
+
+- (FLEXProtocol *)registerProtocol {
+    MutationAssertion(@"Protocol is already registered");
+    
+    _isRegistered = YES;
+    objc_registerProtocol(self.workingProtocol);
+    return [FLEXProtocol protocol:self.workingProtocol];
+}
+
+@end