cao_lang/vm/runtime/
cao_lang_string.rs

1use std::{alloc::Layout, fmt::Debug, ptr::NonNull};
2
3use crate::alloc::AllocProxy;
4
5/// CaoLang Strings are immutable and UTF-8 encoded
6pub struct CaoLangString {
7    pub(crate) len: usize,
8    pub(crate) ptr: NonNull<u8>,
9    pub(crate) alloc: AllocProxy,
10}
11
12impl Debug for CaoLangString {
13    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
14        let str = self.as_str();
15        write!(f, "String: {str:?}")
16    }
17}
18
19impl Drop for CaoLangString {
20    fn drop(&mut self) {
21        unsafe { self.alloc.dealloc(self.ptr, Self::layout(self.len)) }
22    }
23}
24
25impl CaoLangString {
26    pub fn as_str(&self) -> &str {
27        unsafe {
28            let ptr = self.ptr;
29            let len = self.len;
30            std::str::from_utf8_unchecked(std::slice::from_raw_parts(ptr.as_ptr(), len))
31        }
32    }
33
34    pub fn len(&self) -> usize {
35        self.len
36    }
37
38    pub fn is_empty(&self) -> bool {
39        self.len() == 0
40    }
41
42    /// Layout of a string with given length
43    pub(crate) fn layout(len: usize) -> Layout {
44        std::alloc::Layout::array::<char>(len).unwrap()
45    }
46}
cao_lang/vm/runtime/cao_lang_string.rs

cao_lang/vm/runtime/
cao_lang_string.rs
