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use std::borrow::Cow;
/// Get the vec of escaped / quoted / doublequoted filenames from the input str
pub fn shellwords(input: &str) -> Vec<Cow<'_, str>> {
enum State {
Normal,
NormalEscaped,
Quoted,
QuoteEscaped,
Dquoted,
DquoteEscaped,
}
use State::*;
let mut state = Normal;
let mut args: Vec<Cow<str>> = Vec::new();
let mut escaped = String::with_capacity(input.len());
let mut start = 0;
let mut end = 0;
for (i, c) in input.char_indices() {
state = match state {
Normal => match c {
'\\' => {
escaped.push_str(&input[start..i]);
start = i + 1;
NormalEscaped
}
'"' => {
end = i;
Dquoted
}
'\'' => {
end = i;
Quoted
}
c if c.is_ascii_whitespace() => {
end = i;
Normal
}
_ => Normal,
},
NormalEscaped => Normal,
Quoted => match c {
'\\' => {
escaped.push_str(&input[start..i]);
start = i + 1;
QuoteEscaped
}
'\'' => {
end = i;
Normal
}
_ => Quoted,
},
QuoteEscaped => Quoted,
Dquoted => match c {
'\\' => {
escaped.push_str(&input[start..i]);
start = i + 1;
DquoteEscaped
}
'"' => {
end = i;
Normal
}
_ => Dquoted,
},
DquoteEscaped => Dquoted,
};
if i >= input.len() - 1 && end == 0 {
end = i + 1;
}
if end > 0 {
let esc_trim = escaped.trim();
let inp = &input[start..end];
if !(esc_trim.is_empty() && inp.trim().is_empty()) {
if esc_trim.is_empty() {
args.push(inp.into());
} else {
args.push([escaped, inp.into()].concat().into());
escaped = "".to_string();
}
}
start = i + 1;
end = 0;
}
}
args
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn test_normal() {
let input = r#":o single_word twó wörds \three\ \"with\ escaping\\"#;
let result = shellwords(input);
let expected = vec![
Cow::from(":o"),
Cow::from("single_word"),
Cow::from("twó"),
Cow::from("wörds"),
Cow::from(r#"three "with escaping\"#),
];
// TODO test is_owned and is_borrowed, once they get stabilized.
assert_eq!(expected, result);
}
#[test]
fn test_quoted() {
let quoted =
r#":o 'single_word' 'twó wörds' '' ' ''\three\' \"with\ escaping\\' 'quote incomplete"#;
let result = shellwords(quoted);
let expected = vec![
Cow::from(":o"),
Cow::from("single_word"),
Cow::from("twó wörds"),
Cow::from(r#"three' "with escaping\"#),
Cow::from("quote incomplete"),
];
assert_eq!(expected, result);
}
#[test]
fn test_dquoted() {
let dquoted = r#":o "single_word" "twó wörds" "" " ""\three\' \"with\ escaping\\" "dquote incomplete"#;
let result = shellwords(dquoted);
let expected = vec![
Cow::from(":o"),
Cow::from("single_word"),
Cow::from("twó wörds"),
Cow::from(r#"three' "with escaping\"#),
Cow::from("dquote incomplete"),
];
assert_eq!(expected, result);
}
#[test]
fn test_mixed() {
let dquoted = r#":o single_word 'twó wörds' "\three\' \"with\ escaping\\""no space before"'and after' $#%^@ "%^&(%^" ')(*&^%''a\\\\\b' '"#;
let result = shellwords(dquoted);
let expected = vec![
Cow::from(":o"),
Cow::from("single_word"),
Cow::from("twó wörds"),
Cow::from("three' \"with escaping\\"),
Cow::from("no space before"),
Cow::from("and after"),
Cow::from("$#%^@"),
Cow::from("%^&(%^"),
Cow::from(")(*&^%"),
Cow::from(r#"a\\b"#),
//last ' just changes to quoted but since we dont have anything after it, it should be ignored
];
assert_eq!(expected, result);
}
}
|
