add more syntaxs

src/CKMacros.h

@@ -47,3 +47,4 @@
 #define $size(val)        [NSValue valueWithSize:(val)]
 
 #define $safe(obj)        ((NSNull *)(obj) == [NSNull null] ? nil : (obj))
+#define $clamp(val, min, max) MAX(MIN(val, min), max)

src/NSArray+ConciseKit.h

@@ -1,5 +1,5 @@
 #import <Foundation/Foundation.h>
-
+#import "CKMacros.h"
 @interface NSArray (ConciseKit)
 
 - (id)$first;
@@ -11,6 +11,9 @@
 - (NSArray *)$eachWithIndexAndStop:(void (^)(id obj, NSUInteger idx, BOOL *stop))block;
 - (NSArray *)$map:(id (^)(id obj))block;
 - (NSArray *)$mapWithIndex:(id (^)(id obj, NSUInteger idx))block;
+- (id)$safeFirst;
+- (id)$safeLast;
+- (id)$safeAt:(NSUInteger)index;
 - (id)$reduce:(id (^)(id memo, id obj))block;
 - (id)$reduceStartingAt:(id)starting with:(id (^)(id memo, id obj))block;
 - (NSArray *)$select:(BOOL(^)(id obj))block;

src/NSArray+ConciseKit.m

@@ -58,6 +58,18 @@ @implementation NSArray (ConciseKit)
   return array;
 }
 
+- (id)$safeFirst {
+  return $safe([self objectAtIndex:0]);
+}
+
+- (id)$safeLast {
+  return $safe([self lastObject]);
+}
+
+- (id)$safeAt:(NSUInteger)index {
+  return $safe([self objectAtIndex:index]);
+}
+
 - (id)$reduce:(id (^)(id memo, id obj))block {
   __block id ret = nil;
   [self enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

src/NSDictionary+ConciseKit.h

@@ -1,8 +1,9 @@
 #import <Foundation/Foundation.h>
-
+#import "CKMacros.h"
 @interface NSDictionary (ConciseKit)
 
 - (id)$for:(id)aKey;
+- (id)$safeFor:(id)aKey;
 - (NSArray *)$keys;
 - (NSArray *)$values;
 - (NSDictionary *)$each:(void (^)(id key, id value))block;

src/NSDictionary+ConciseKit.m

@@ -5,7 +5,9 @@ @implementation NSDictionary (ConciseKit)
 - (id)$for:(id)aKey {
   return [self objectForKey:aKey];
 }
-
+- (id)$safeFor:(id)aKey {
+  return $safe([self objectForKey:aKey]);
+}
 - (NSArray *)$keys {
     return [self allKeys];
 }

src/NSString+ConciseKit.h

@@ -6,6 +6,9 @@
 - (NSString *)$prepend:(NSString *)aString;
 - (NSArray *)$split:(NSString *)aString;
 - (NSArray *)$split;
+- (BOOL)$isBlank;
+- (NSInteger)$indexOf:(NSString *)theSubString from:(NSInteger)theFrom;
+- (NSString *)$substringFrom:(NSInteger)theFrom to:(NSInteger)theTo;
 
 @end
 

src/NSString+ConciseKit.m

@@ -18,6 +18,25 @@ @implementation NSString (ConciseKit)
     return [self componentsSeparatedByCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
 }
 
+- (BOOL)$isBlank {
+    return ([self length] == 0);
+}
+
+- (NSInteger)$indexOf:(NSString *)theSubString from:(NSInteger)theFrom {
+    NSRange theRange = NSMakeRange(theFrom, self.length - theFrom);
+
+	NSRange theIndex = [self rangeOfString:theSubString options:NSLiteralSearch range:theRange];
+	if (theIndex.location == NSNotFound) {
+		return -1;
+	}
+	return theIndex.location + theIndex.length;
+}
+
+- (NSString *)$substringFrom:(NSInteger)theFrom to:(NSInteger)theTo {
+	NSRange theRange = NSMakeRange(theFrom, theTo - theFrom);
+	return [self substringWithRange:theRange];
+}
+
 @end
 
 @implementation NSMutableString (ConciseKit)