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const DOUBLE: u8 = 1;
const SINGLE: u8 = 2;
const BACK: u8 = 4;
/// An efficient `Iterator` structure for splitting arguments
pub struct ArgumentSplitter<'a> {
buffer: Vec<u8>,
data: &'a str,
read: usize,
flags: u8,
}
impl<'a> ArgumentSplitter<'a> {
pub fn new(data: &'a str) -> ArgumentSplitter<'a> {
ArgumentSplitter {
buffer: Vec::with_capacity(32),
data: data,
read: 0,
flags: 0,
}
}
}
impl<'a> Iterator for ArgumentSplitter<'a> {
type Item = String;
fn next(&mut self) -> Option<String> {
for character in self.data.bytes().skip(self.read) {
self.read += 1;
match character {
_ if self.flags & BACK != 0 => {
self.buffer.push(character);
self.flags ^= BACK;
},
b'"' if self.flags & SINGLE == 0 => self.flags ^= DOUBLE,
b'\'' if self.flags & DOUBLE == 0 => self.flags ^= SINGLE,
b' ' if !self.buffer.is_empty() & (self.flags & (SINGLE + DOUBLE) == 0) => break,
b'\\' if (self.flags & (SINGLE + DOUBLE) == 0) => self.flags ^= BACK,
_ => {
self.buffer.push(character);
}
}
}
if self.buffer.is_empty() {
None
} else {
let mut output = self.buffer.clone();
output.shrink_to_fit();
self.buffer.clear();
Some(unsafe { String::from_utf8_unchecked(output) })
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_split_args() {
use std::str;
let argument = ArgumentSplitter::new("ffmpeg -i \"file with spaces\" \"output with spaces\"");
let expected = vec!["ffmpeg", "-i", "file with spaces", "output with spaces"];
let argument = argument.collect::<Vec<Vec<u8>>>();
let argument = argument.iter().map(|x| str::from_utf8(x).unwrap()).collect::<Vec<&str>>();
assert_eq!(argument, expected);
let argument = ArgumentSplitter::new("one\\ two\\\\ a\\\'b\\\"c");
let expected = vec!["one two\\", "a\'b\"c"];
let argument = argument.collect::<Vec<Vec<u8>>>();
let argument = argument.iter().map(|x| str::from_utf8(x).unwrap()).collect::<Vec<&str>>();
assert_eq!(argument, expected);
}
}
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