RGBCube/uutils-coreutils
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Refactoring

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This commit is contained in:
Derek Chiang 2013-12-01 20:00:44 -05:00
parent 2bdc925fbc
commit 0bb66b167e
1 changed files with 35 additions and 75 deletions
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110
echo/echo.rs
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@ -41,6 +41,29 @@ fn isodigit(c: u8) -> bool {
} }
} }
fn convert_str(string: &str, index: uint, base: uint) -> (char, int) {
let (max_digits, is_legal_digit) = match base {
8u => (3, isodigit),
16u => (2, isxdigit),
_ => fail!(),
};
let mut bytes: ~[u8] = ~[];
for offset in range(0, max_digits) {
let c = string[index + offset as uint];
if is_legal_digit(c) {
bytes.push(c as u8);
} else {
if bytes.len() > 0 {
return (to_char(bytes, base), offset);
} else {
return (' ', offset);
}
}
}
return (to_char(bytes, base), max_digits)
}
fn main() { fn main() {
let args = os::args(); let args = os::args();
let program = args[0].clone(); let program = args[0].clone();
@ -120,90 +143,27 @@ fn main() {
't' => print_char('\t'), 't' => print_char('\t'),
'v' => print_char('\x0B'), 'v' => print_char('\x0B'),
'x' => { 'x' => {
if index == string.len() - 1 { let (c, num_char_used) = convert_str(string, index + 1, 16u);
if num_char_used == 0 {
print_char('\\'); print_char('\\');
print_char('x'); print_char('x');
} else if index == string.len() - 2 {
let next_char = string[index + 1];
if isxdigit(next_char) {
print_char(to_char([next_char as u8], 16u));
iter.next();
} else {
print_char('\\');
print_char('x');
}
} else { } else {
let next_char = string[index + 1]; print_char(c);
let next_next_char = string[index + 2]; for _ in range(0, num_char_used) {
match (isxdigit(next_char), isxdigit(next_next_char)) { iter.next(); // consume used characters
(true, true) => { }
print_char(to_char([next_char as u8, next_next_char as u8], 16u));
iter.next(); iter.next();
}
(true, false) => {
print_char(to_char([next_char as u8], 16u));
iter.next();
}
_ => {
print_char('\\');
print_char('x');
}
};
} }
}, },
'0' => { '0' => {
if index == string.len() - 1 { let (c, num_char_used) = convert_str(string, index + 1, 8u);
if num_char_used == 0 {
print_char('\\'); print_char('\\');
print_char('0'); print_char('0');
} else if index == string.len() - 2 {
let next_char = string[index + 1];
if isodigit(next_char) {
print_char(to_char([next_char as u8], 8u));
iter.next();
} else {
print_char('\\');
print_char('0');
}
} else if index == string.len() - 3 {
let next_char = string[index + 1];
let next_next_char = string[index + 2];
match (isodigit(next_char), isodigit(next_next_char)) {
(true, true) => {
print_char(to_char([next_char as u8, next_next_char as u8], 8u));
iter.next(); iter.next();
}
(true, false) => {
print_char(to_char([next_char as u8], 8u));
iter.next();
}
_ => {
print_char('\\');
print_char('x');
}
};
} else { } else {
let next_char = string[index + 1]; print_char(c);
let next_next_char = string[index + 2]; for _ in range(0, num_char_used) {
let next_next_next_char = string[index + 3]; iter.next(); // consume used characters
match (isodigit(next_char), isodigit(next_next_char), }
isodigit(next_next_next_char)) {
(true, true, true) => {
print_char(to_char([next_char as u8, next_next_char as u8, next_next_next_char as u8], 8u));
iter.next(); iter.next(); iter.next();
}
(true, true, false) => {
print_char(to_char([next_char as u8, next_next_char as u8], 8u));
iter.next(); iter.next();
}
(true, false, false) => {
print_char(to_char([next_char as u8], 8u));
iter.next();
}
_ => {
print_char('\\');
print_char('x');
}
};
} }
} }
_ => { _ => {