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use crate::terminal::error::{self, TerminalError};
use std::io::{BufRead, BufReader, Read};
use std::str;
pub struct CharBufReader<R: Read> {
byte_reader: BufReader<R>,
char_buffer: String,
}
impl<R: Read> CharBufReader<R> {
pub fn new(input_stream: R) -> CharBufReader<R> {
let byte_reader = BufReader::new(input_stream);
CharBufReader {
byte_reader: byte_reader,
char_buffer: String::new(),
}
}
pub fn fill_buf(&mut self)
-> std::result::Result<&str, TerminalError>
{
loop {
let byte_buffer = self.byte_reader.fill_buf().map_err(error::input)?;
match str::from_utf8(byte_buffer) {
Err(error) => {
let n_valid = error.valid_up_to();
if n_valid == 0 {
self.byte_reader.consume(1);
} else {
match str::from_utf8(&byte_buffer[..n_valid]) {
Err(_) => {
self.byte_reader.consume(1);
},
Ok(chars) => {
self.char_buffer.push_str(chars);
self.byte_reader.consume(n_valid);
break;
},
}
}
},
Ok(chars) => {
self.char_buffer.push_str(chars);
let n_to_consume = byte_buffer.len();
self.byte_reader.consume(n_to_consume);
break;
}
}
}
return Ok(&self.char_buffer);
}
pub fn consume(&mut self, amount: usize) {
self.char_buffer.replace_range(..amount, "");
println!("consume {:?}", self.char_buffer);
}
}
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