57 lines
1.7 KiB
Rust
57 lines
1.7 KiB
Rust
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//! A wrapper library for `NSString`, which we use throughout the framework. This is abstracted out
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//! for a few reasons, but namely:
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//!
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//! - It's used often, so we want a decent enough API.
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//! - Playing around with performance for this type is ideal, as it's a lot of heap allocation.
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//!
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//! End users should never need to interact with this.
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use std::{slice, str};
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use std::os::raw::c_char;
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use objc::{class, msg_send, sel, sel_impl};
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use objc::runtime::Object;
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use objc_id::Id;
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use crate::foundation::id;
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const UTF8_ENCODING: usize = 4;
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/// Wraps an underlying `NSString`.
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#[derive(Debug)]
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pub struct NSString(pub Id<Object>);
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impl NSString {
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pub fn new(s: &str) -> Self {
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NSString(unsafe {
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let nsstring: *mut Object = msg_send![class!(NSString), alloc];
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//msg_send![nsstring, initWithBytesNoCopy:s.as_ptr() length:s.len() encoding:4 freeWhenDone:NO]
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Id::from_ptr(msg_send![nsstring, initWithBytes:s.as_ptr() length:s.len() encoding:UTF8_ENCODING])
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})
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}
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pub fn wrap(object: id) -> Self {
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NSString(unsafe {
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Id::from_retained_ptr(object)
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})
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}
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pub fn into_inner(mut self) -> id {
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&mut *self.0
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}
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/// A utility method for taking an `NSString` and bridging it to a Rust `&str`.
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pub fn to_str(self) -> &'static str {
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unsafe {
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let bytes = {
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let bytes: *const c_char = msg_send![&*self.0, UTF8String];
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bytes as *const u8
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};
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let len = msg_send![&*self.0, lengthOfBytesUsingEncoding:UTF8_ENCODING];
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let bytes = slice::from_raw_parts(bytes, len);
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str::from_utf8(bytes).unwrap()
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}
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}
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}
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