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121 lines
4.0 KiB
Objective-C
121 lines
4.0 KiB
Objective-C
#import "NSMethodSignatureForBlock.m"
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#import <Foundation/NSDictionary.h>
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#import <Foundation/NSException.h>
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#import "AnyPromise+Private.h"
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#import <Foundation/NSError.h>
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#import <dispatch/once.h>
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#import <string.h>
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#ifndef PMKLog
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#define PMKLog NSLog
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#endif
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@interface PMKArray : NSObject {
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@public
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id objs[3];
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NSUInteger count;
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} @end
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@implementation PMKArray
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- (id)objectAtIndexedSubscript:(NSUInteger)idx {
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if (count <= idx) {
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// this check is necessary due to lack of checks in `pmk_safely_call_block`
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return nil;
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}
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return objs[idx];
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}
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@end
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id __PMKArrayWithCount(NSUInteger count, ...) {
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PMKArray *this = [PMKArray new];
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this->count = count;
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va_list args;
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va_start(args, count);
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for (NSUInteger x = 0; x < count; ++x)
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this->objs[x] = va_arg(args, id);
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va_end(args);
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return this;
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}
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static inline id _PMKCallVariadicBlock(id frock, id result) {
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NSCAssert(frock, @"");
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NSMethodSignature *sig = NSMethodSignatureForBlock(frock);
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const NSUInteger nargs = sig.numberOfArguments;
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const char rtype = sig.methodReturnType[0];
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#define call_block_with_rtype(type) ({^type{ \
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switch (nargs) { \
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case 1: \
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return ((type(^)(void))frock)(); \
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case 2: { \
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const id arg = [result class] == [PMKArray class] ? result[0] : result; \
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return ((type(^)(id))frock)(arg); \
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} \
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case 3: { \
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type (^block)(id, id) = frock; \
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return [result class] == [PMKArray class] \
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? block(result[0], result[1]) \
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: block(result, nil); \
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} \
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case 4: { \
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type (^block)(id, id, id) = frock; \
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return [result class] == [PMKArray class] \
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? block(result[0], result[1], result[2]) \
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: block(result, nil, nil); \
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} \
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default: \
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@throw [NSException exceptionWithName:NSInvalidArgumentException reason:@"PromiseKit: The provided block’s argument count is unsupported." userInfo:nil]; \
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}}();})
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switch (rtype) {
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case 'v':
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call_block_with_rtype(void);
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return nil;
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case '@':
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return call_block_with_rtype(id) ?: nil;
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case '*': {
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char *str = call_block_with_rtype(char *);
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return str ? @(str) : nil;
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}
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case 'c': return @(call_block_with_rtype(char));
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case 'i': return @(call_block_with_rtype(int));
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case 's': return @(call_block_with_rtype(short));
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case 'l': return @(call_block_with_rtype(long));
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case 'q': return @(call_block_with_rtype(long long));
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case 'C': return @(call_block_with_rtype(unsigned char));
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case 'I': return @(call_block_with_rtype(unsigned int));
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case 'S': return @(call_block_with_rtype(unsigned short));
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case 'L': return @(call_block_with_rtype(unsigned long));
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case 'Q': return @(call_block_with_rtype(unsigned long long));
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case 'f': return @(call_block_with_rtype(float));
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case 'd': return @(call_block_with_rtype(double));
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case 'B': return @(call_block_with_rtype(_Bool));
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case '^':
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if (strcmp(sig.methodReturnType, "^v") == 0) {
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call_block_with_rtype(void);
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return nil;
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}
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// else fall through!
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default:
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@throw [NSException exceptionWithName:@"PromiseKit" reason:@"PromiseKit: Unsupported method signature." userInfo:nil];
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}
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}
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static id PMKCallVariadicBlock(id frock, id result) {
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@try {
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return _PMKCallVariadicBlock(frock, result);
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} @catch (id thrown) {
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if ([thrown isKindOfClass:[NSString class]])
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return thrown;
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if ([thrown isKindOfClass:[NSError class]])
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return thrown;
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// we don’t catch objc exceptions: they are meant to crash your app
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@throw thrown;
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}
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}
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