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extern crate libc;
use std::ffi::{CStr, CString};
use std::io;
#[link(name = "ucl")]
extern "C" {
fn ucl_parser_new(flags: i32) -> *mut libc::c_void;
fn ucl_parser_free(p: *mut libc::c_void);
fn ucl_parser_add_chunk_full(
p: *mut libc::c_void,
s: *const i8,
len: libc::size_t,
priority: libc::c_int,
strat: libc::c_int,
parse_type: libc::c_int,
) -> bool;
fn ucl_parser_get_error(p: *mut libc::c_void) -> *const libc::c_char;
fn ucl_parser_get_object(p: *mut libc::c_void) -> *mut libc::c_void;
fn ucl_object_unref(p: *mut libc::c_void);
fn ucl_object_emit(o: *mut libc::c_void, t: i32) -> *const libc::c_char;
}
enum Ucl {
Parser(*mut libc::c_void),
Object(*mut libc::c_void),
}
impl Drop for Ucl {
fn drop(&mut self) {
match self {
Ucl::Parser(h) => unsafe { ucl_parser_free(*h) },
Ucl::Object(h) => unsafe { ucl_object_unref(*h) },
}
}
}
impl Ucl {
fn unwrap(&self) -> *mut libc::c_void {
match self {
Ucl::Parser(h) => *h,
Ucl::Object(h) => *h,
}
}
}
pub fn ucl_to_json(src: &mut io::Read) -> io::Result<String> {
let mut buffer = String::new();
src.read_to_string(&mut buffer)?;
let len = buffer.len();
let src = match CString::new(buffer) {
Ok(s) => s,
Err(_) => {
return Err(io::Error::new(
io::ErrorKind::Other,
"Can't convert UCL to Utf8".to_owned(),
))
}
};
let p = match unsafe { ucl_parser_new(0) } {
h if !h.is_null() => Ucl::Parser(h),
_ => {
return Err(io::Error::new(
io::ErrorKind::Other,
"Failed to create UCL parser",
))
}
};
if !unsafe { ucl_parser_add_chunk_full(p.unwrap(), src.as_ptr(), len, 0, 1, 0) } {
return match unsafe { ucl_parser_get_error(p.unwrap()) } {
cerr if !cerr.is_null() => {
let err = unsafe { CStr::from_ptr(cerr) }.to_str().unwrap();
Err(io::Error::new(
io::ErrorKind::Other,
format!("Failed to parse UCL: {}", err),
))
}
_ => Err(io::Error::new(io::ErrorKind::Other, "Failed to parse UCL")),
};
}
let o = match unsafe { ucl_parser_get_object(p.unwrap()) } {
h if !h.is_null() => Ucl::Object(h),
_ => {
return Err(io::Error::new(
io::ErrorKind::Other,
"Failed to get UCL object",
))
}
};
let cstr = unsafe { CStr::from_ptr(ucl_object_emit(o.unwrap(), 1)) };
Ok(cstr.to_str().unwrap().to_owned())
}
#[cfg(test)]
mod tests {
#[test]
fn ucl_to_json() {
assert_eq!(
super::ucl_to_json(&mut "hello: \"hello\"".as_bytes()).unwrap(),
"{\"hello\":\"hello\"}"
);
}
}