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extern crate libc;
use libc::{size_t, c_void, c_char};
use std::ptr;
use std::ffi::{CStr, CString};
#[link(name = "opencc")]
extern {
fn opencc_open(config: *const c_char) -> *mut c_void;
fn opencc_close(opencc: *mut c_void);
fn opencc_convert_utf8(opencc: *mut c_void, text: *const c_char, length: size_t) -> *mut c_char;
fn opencc_convert_utf8_free(text: *mut c_char);
fn opencc_error() -> *const c_char;
}
pub struct OpenCC {
pub config: String,
libopencc: *mut c_void,
}
impl OpenCC {
pub fn new(config: &str) -> OpenCC {
let c_config = CString::new(config).unwrap();
unsafe {
OpenCC {
config: config.to_string(),
libopencc: opencc_open(c_config.as_ptr()),
}
}
}
pub fn convert(&self, text: &str) -> String {
unsafe {
let c_text = CString::new(text).unwrap();
let c_ptr = opencc_convert_utf8(self.libopencc, c_text.as_ptr(), text.len() as size_t);
let c_str = CStr::from_ptr(c_ptr);
let str_buf = c_str.to_str().unwrap().to_owned();
opencc_convert_utf8_free(c_ptr);
str_buf
}
}
fn close(&mut self) {
if !self.libopencc.is_null() {
unsafe {
opencc_close(self.libopencc);
}
self.libopencc = ptr::null_mut();
}
}
pub fn last_error(&mut self) -> Option<String> {
unsafe {
let error_ptr = opencc_error();
if error_ptr.is_null() {
None
} else {
let c_str = CStr::from_ptr(error_ptr);
let str_buf = c_str.to_str().unwrap().to_owned();
Some(str_buf)
}
}
}
}
impl Drop for OpenCC {
fn drop(&mut self) {
self.close();
}
}
unsafe impl Send for OpenCC {}
unsafe impl Sync for OpenCC {}
#[cfg(test)]
mod tests {
use super::OpenCC;
#[test]
fn test_simple_convert() {
let cc = OpenCC::new("t2s.json");
assert_eq!("乾坤一掷", &cc.convert("乾坤一擲"));
assert_eq!("开放中文转换", &cc.convert("開放中文轉換"));
}
#[test]
fn test_opencc_last_error() {
let mut cc = OpenCC::new("t2s.json");
println!("{}", cc.last_error().unwrap());
}
}