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use std::os::raw::c_char; use std::slice; use std::str; use objc_id::{Id, ShareId}; use INSObject; pub trait INSCopying : INSObject { type Output: INSObject; fn copy(&self) -> ShareId<Self::Output> { unsafe { let obj: *mut Self::Output = msg_send![self, copy]; Id::from_retained_ptr(obj) } } } pub trait INSMutableCopying : INSObject { type Output: INSObject; fn mutable_copy(&self) -> Id<Self::Output> { unsafe { let obj: *mut Self::Output = msg_send![self, mutableCopy]; Id::from_retained_ptr(obj) } } } const UTF8_ENCODING: usize = 4; pub trait INSString : INSObject { fn len(&self) -> usize { unsafe { msg_send![self, lengthOfBytesUsingEncoding:UTF8_ENCODING] } } fn as_str(&self) -> &str { let bytes = unsafe { let bytes: *const c_char = msg_send![self, UTF8String]; bytes as *const u8 }; let len = self.len(); unsafe { let bytes = slice::from_raw_parts(bytes, len); str::from_utf8(bytes).unwrap() } } fn from_str(string: &str) -> Id<Self> { let cls = Self::class(); unsafe { let obj: *mut Self = msg_send![cls, alloc]; let obj: *mut Self = msg_send![obj, initWithBytes:string.as_ptr() length:string.len() encoding:UTF8_ENCODING]; Id::from_retained_ptr(obj) } } } object_struct!(NSString); impl INSString for NSString { } impl INSCopying for NSString { type Output = NSString; } #[cfg(test)] mod tests { use super::{INSCopying, INSString, NSString}; #[test] fn test_utf8() { let expected = "ประเทศไทย中华Việt Nam"; let s = NSString::from_str(expected); assert!(s.len() == expected.len()); assert!(s.as_str() == expected); } #[test] fn test_interior_nul() { let expected = "Hello\0World"; let s = NSString::from_str(expected); assert!(s.len() == expected.len()); assert!(s.as_str() == expected); } #[test] fn test_copy() { let s = NSString::from_str("Hello!"); let copied = s.copy(); assert!(copied.as_str() == s.as_str()); } }