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use once_cell::sync::Lazy;
use regex::{Captures, Regex};
static C_PTR_RE: Lazy<Regex> =
Lazy::new(|| Regex::new(r"(const )?([a-zA-Z0-9_]+)\s?\*(.*)").unwrap());
static REST_C_PTR_RE: Lazy<Regex> = Lazy::new(|| Regex::new(r"(const)?\s?\*").unwrap());
pub fn c_ptr_to_rust_ptr(c_ptr: &str) -> String
{
C_PTR_RE
.replace(c_ptr, |captures: &Captures| {
let const_or_mut = captures.get(1).map_or_else(|| "mut", |_| "const");
let type_name = captures.get(2).unwrap().as_str();
let rest = captures.get(3).unwrap();
let rest_ptr_matches = REST_C_PTR_RE.captures_iter(rest.as_str());
let rest_ptrs = rest_ptr_matches
.map(|capts| {
let const_or_mut = capts.get(1).map_or_else(|| "mut", |_| "const");
format!("*{const_or_mut} ")
})
.collect::<Vec<_>>();
format!("{}*{const_or_mut} {type_name}", rest_ptrs.join(" "))
})
.to_string()
}
#[cfg(test)]
mod tests
{
use pretty_assertions::assert_str_eq;
use super::*;
#[test]
fn c_ptr_to_rust_ptr_works()
{
assert_str_eq!(c_ptr_to_rust_ptr("void *"), "*mut void");
assert_str_eq!(c_ptr_to_rust_ptr("const void*"), "*const void");
assert_str_eq!(c_ptr_to_rust_ptr("GLint *"), "*mut GLint");
assert_str_eq!(c_ptr_to_rust_ptr("const GLint*"), "*const GLint");
assert_str_eq!(c_ptr_to_rust_ptr("const GLint *"), "*const GLint");
assert_str_eq!(c_ptr_to_rust_ptr("const GLint **"), "*mut *const GLint");
assert_str_eq!(c_ptr_to_rust_ptr("const GLint * *"), "*mut *const GLint");
assert_str_eq!(c_ptr_to_rust_ptr("GLint **"), "*mut *mut GLint");
assert_str_eq!(c_ptr_to_rust_ptr("GLuint * const*"), "*const *mut GLuint");
assert_str_eq!(
c_ptr_to_rust_ptr("const GLuint * const*"),
"*const *const GLuint"
);
assert_str_eq!(c_ptr_to_rust_ptr("GLchar"), "GLchar");
}
}
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