1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
|
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! Implementations of I/O traits for the IoResult type
//!
//! I/O constructors return option types to allow errors to be handled.
//! These implementations allow e.g. `IoResult<File>` to be used
//! as a `Reader` without unwrapping the result first.
use clone::Clone;
use result::Result::{Ok, Err};
use super::{Reader, Writer, Listener, Acceptor, Seek, SeekStyle, IoResult};
impl<W: Writer> Writer for IoResult<W> {
fn write_all(&mut self, buf: &[u8]) -> IoResult<()> {
match *self {
Ok(ref mut writer) => writer.write_all(buf),
Err(ref e) => Err((*e).clone())
}
}
fn flush(&mut self) -> IoResult<()> {
match *self {
Ok(ref mut writer) => writer.flush(),
Err(ref e) => Err(e.clone()),
}
}
}
impl<R: Reader> Reader for IoResult<R> {
fn read(&mut self, buf: &mut [u8]) -> IoResult<usize> {
match *self {
Ok(ref mut reader) => reader.read(buf),
Err(ref e) => Err(e.clone()),
}
}
}
impl<S: Seek> Seek for IoResult<S> {
fn tell(&self) -> IoResult<u64> {
match *self {
Ok(ref seeker) => seeker.tell(),
Err(ref e) => Err(e.clone()),
}
}
fn seek(&mut self, pos: i64, style: SeekStyle) -> IoResult<()> {
match *self {
Ok(ref mut seeker) => seeker.seek(pos, style),
Err(ref e) => Err(e.clone())
}
}
}
impl<A: Acceptor, L: Listener<A>> Listener<A> for IoResult<L> {
fn listen(self) -> IoResult<A> {
match self {
Ok(listener) => listener.listen(),
Err(e) => Err(e),
}
}
}
impl<A: Acceptor> Acceptor for IoResult<A> {
type Connection = A::Connection;
fn accept(&mut self) -> IoResult<A::Connection> {
match *self {
Ok(ref mut acceptor) => acceptor.accept(),
Err(ref e) => Err(e.clone()),
}
}
}
#[cfg(test)]
mod test {
use prelude::v1::*;
use super::super::mem::*;
use old_io::{self, Reader, Writer};
#[test]
fn test_option_writer() {
let mut writer: old_io::IoResult<Vec<u8>> = Ok(Vec::new());
writer.write_all(&[0, 1, 2]).unwrap();
writer.flush().unwrap();
assert_eq!(writer.unwrap(), [0, 1, 2]);
}
#[test]
fn test_option_writer_error() {
let mut writer: old_io::IoResult<Vec<u8>> =
Err(old_io::standard_error(old_io::EndOfFile));
match writer.write_all(&[0, 0, 0]) {
Ok(..) => panic!(),
Err(e) => assert_eq!(e.kind, old_io::EndOfFile),
}
match writer.flush() {
Ok(..) => panic!(),
Err(e) => assert_eq!(e.kind, old_io::EndOfFile),
}
}
#[test]
fn test_option_reader() {
let mut reader: old_io::IoResult<MemReader> =
Ok(MemReader::new(vec!(0, 1, 2, 3)));
let mut buf = [0, 0];
reader.read(&mut buf).unwrap();
let b: &[_] = &[0, 1];
assert_eq!(buf, b);
}
#[test]
fn test_option_reader_error() {
let mut reader: old_io::IoResult<MemReader> =
Err(old_io::standard_error(old_io::EndOfFile));
let mut buf = [];
match reader.read(&mut buf) {
Ok(..) => panic!(),
Err(e) => assert_eq!(e.kind, old_io::EndOfFile),
}
}
}
|
