init - 初始化项目

modules/core/misc/objc/common/Range.m

@@ -0,0 +1,86 @@
+//
+//  Range.m
+//
+//  Created by Giles Payne on 2019/10/08.
+//
+
+#import "Range.h"
+
+@implementation Range
+
+- (instancetype)init {
+    return [self initWithStart:0 end: 0];
+}
+
+- (instancetype)initWithStart:(int)start end:(int)end {
+    self = [super init];
+    if (self != nil) {
+        self.start = start;
+        self.end = end;
+    }
+    return self;
+}
+
+- (instancetype)initWithVals:(NSArray<NSNumber*>*)vals {
+    self = [self init];
+    if (self != nil) {
+        [self set:vals];
+    }
+    return self;
+}
+
+- (void)set:(NSArray<NSNumber*>*)vals {
+    self.start = (vals != nil && vals.count > 0) ? vals[0].intValue : 0;
+    self.end = (vals != nil && vals.count > 1 ) ? vals[1].intValue : 0;
+}
+
+- (int)size {
+    return [self empty] ? 0 : self.end - self.start;
+}
+
+- (BOOL)empty {
+    return self.end <= self.start;
+}
+
++ (Range*)all {
+    return [[Range alloc] initWithStart:INT_MIN end:INT_MAX];
+}
+
+- (Range*)intersection:(Range*)r1 {
+    Range* out = [[Range alloc] initWithStart:MAX(r1.start, self.start) end:MIN(r1.end, self.end)];
+    out.end = MAX(out.end, out.start);
+    return out;
+}
+
+- (Range*)shift:(int)delta {
+    return [[Range alloc] initWithStart:self.start + delta end:self.end + delta];
+}
+
+- (Range*)clone {
+    return [[Range alloc] initWithStart:self.start end:self.end];
+}
+
+- (BOOL)isEqual:(id)other {
+    if (other == self) {
+        return YES;
+    } else if (![other isKindOfClass:[Range class]]) {
+        return NO;
+    } else {
+        Range* it = (Range*)other;
+        return self.start == it.start && self.end == it.end;
+    }
+}
+
+- (NSUInteger)hash {
+    int prime = 31;
+    uint32_t result = 1;
+    result = prime * result + self.start;
+    result = prime * result + self.end;
+    return result;
+}
+
+- (NSString *)description {
+    return [NSString stringWithFormat:@"Range {%d, %d}", self.start, self.end];
+}
+
+@end