Pseudo-asynchronous Block-based Objective-C -> PHP/Python/Ruby Bridge

PPTerminal.m

//
//  PPTerminal.m
//
//  Created by Dr.Kameleon on 9/28/14.
//  Copyright (c) 2011-2014 InSili.co. All rights reserved.
//
//-----------------------------------------------------------
//  Pseudo-asynchronous Block-based
//  Objective-C -> PHP/Python/Ruby Bridge
//
//  + Generic NSTask handker
//-----------------------------------------------------------

#import "PPTerminal.h"

#define RESOURCES_PATH              [[NSBundle mainBundle] resourcePath]
#define RSRC_PATH(X)                [RESOURCES_PATH stringByAppendingPathComponent:(X)]
#define DO_ASYNC                    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
#define DO_ASYNC_END                });

@implementation PPTerminal

+ (NSString*)exec:(NSArray *)args
{
    NSTask* task            = [NSTask new];
    NSPipe* output          = [NSPipe new];
    NSPipe* error           = [NSPipe new];
    NSFileHandle* outputF   = [output fileHandleForReading];
    NSFileHandle* errorF    = [error fileHandleForReading];
    
    [task setLaunchPath:@"/usr/bin/env"];
    [task setArguments:args];
    [task setStandardOutput:output];
    [task setStandardError:error];
    
    [task launch];
    [task waitUntilExit];
    
    NSData* outputD = [outputF readDataToEndOfFile];
    NSData* errorD  = [errorF readDataToEndOfFile];
    
    NSString* outputS = [[NSString alloc] initWithData:outputD encoding:NSUTF8StringEncoding];
    NSString* errorS  = [[NSString alloc] initWithData:errorD encoding:NSUTF8StringEncoding];
    
    return [outputS stringByAppendingString:errorS];
}

+ (NSString*)compile:(NSString *)compiler args:(NSArray*)args script:(NSString *)script data:(NSString *)data
{
    NSString* scriptPath = RSRC_PATH(script);
    
    NSMutableArray* arguments = [[NSMutableArray alloc] initWithObjects: nil];
    
    [arguments addObject:compiler];
    [arguments addObjectsFromArray:args];
    [arguments addObject:scriptPath];
    [arguments addObject:data];
    
    return [self exec:arguments];
}

+ (NSString*)php:(NSString*)script data:(NSString *)data
{
    return [self compile:@"php" args:@[@"-f"] script:script data:data];
}

+ (void)php:(NSString*)script data:(NSString *)data action:(void (^)(NSString*))action
{
    DO_ASYNC
        action([self php:script data:data]);
    DO_ASYNC_END
}

+ (NSString*)python:(NSString*)script data:(NSString *)data
{
    return [self compile:@"php" args:@[] script:script data:data];
}

+ (void)python:(NSString*)script data:(NSString *)data action:(void (^)(NSString*))action
{
    DO_ASYNC
        action([self php:script data:data]);
    DO_ASYNC_END
}

+ (NSString*)ruby:(NSString*)script data:(NSString *)data
{
    return [self compile:@"ruby" args:@[] script:script data:data];
}

+ (void)ruby:(NSString*)script data:(NSString *)data action:(void (^)(NSString*))action
{
    DO_ASYNC
        action([self php:script data:data]);
    DO_ASYNC_END
}

@end