Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Sources/NSMethodSignatureForBlock.m

@@ -0,0 +1,77 @@
+#import <Foundation/NSMethodSignature.h>
+
+struct PMKBlockLiteral {
+    void *isa; // initialized to &_NSConcreteStackBlock or &_NSConcreteGlobalBlock
+    int flags;
+    int reserved;
+    void (*invoke)(void *, ...);
+    struct block_descriptor {
+        unsigned long int reserved;	// NULL
+    	unsigned long int size;         // sizeof(struct Block_literal_1)
+        // optional helper functions
+    	void (*copy_helper)(void *dst, void *src);     // IFF (1<<25)
+    	void (*dispose_helper)(void *src);             // IFF (1<<25)
+        // required ABI.2010.3.16
+        const char *signature;                         // IFF (1<<30)
+    } *descriptor;
+    // imported variables
+};
+
+typedef NS_OPTIONS(NSUInteger, PMKBlockDescriptionFlags) {
+    PMKBlockDescriptionFlagsHasCopyDispose = (1 << 25),
+    PMKBlockDescriptionFlagsHasCtor = (1 << 26), // helpers have C++ code
+    PMKBlockDescriptionFlagsIsGlobal = (1 << 28),
+    PMKBlockDescriptionFlagsHasStret = (1 << 29), // IFF BLOCK_HAS_SIGNATURE
+    PMKBlockDescriptionFlagsHasSignature = (1 << 30)
+};
+
+// It appears 10.7 doesn't support quotes in method signatures. Remove them
+// via @rabovik's method. See https://github.com/OliverLetterer/SLObjectiveCRuntimeAdditions/pull/2
+#if defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_8
+NS_INLINE static const char * pmk_removeQuotesFromMethodSignature(const char *str){
+    char *result = malloc(strlen(str) + 1);
+    BOOL skip = NO;
+    char *to = result;
+    char c;
+    while ((c = *str++)) {
+        if ('"' == c) {
+            skip = !skip;
+            continue;
+        }
+        if (skip) continue;
+        *to++ = c;
+    }
+    *to = '\0';
+    return result;
+}
+#endif
+
+static NSMethodSignature *NSMethodSignatureForBlock(id block) {
+    if (!block)
+        return nil;
+
+    struct PMKBlockLiteral *blockRef = (__bridge struct PMKBlockLiteral *)block;
+    PMKBlockDescriptionFlags flags = (PMKBlockDescriptionFlags)blockRef->flags;
+
+    if (flags & PMKBlockDescriptionFlagsHasSignature) {
+        void *signatureLocation = blockRef->descriptor;
+        signatureLocation += sizeof(unsigned long int);
+        signatureLocation += sizeof(unsigned long int);
+
+        if (flags & PMKBlockDescriptionFlagsHasCopyDispose) {
+            signatureLocation += sizeof(void(*)(void *dst, void *src));
+            signatureLocation += sizeof(void (*)(void *src));
+        }
+
+        const char *signature = (*(const char **)signatureLocation);
+#if defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && __MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_8
+        signature = pmk_removeQuotesFromMethodSignature(signature);
+        NSMethodSignature *nsSignature = [NSMethodSignature signatureWithObjCTypes:signature];
+        free((void *)signature);
+
+        return nsSignature;
+#endif
+        return [NSMethodSignature signatureWithObjCTypes:signature];
+    }
+    return 0;
+}