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use std::str;
use std::collections::HashMap;
use std::num::ParseIntError;
pub fn parse_qs(query: String) -> HashMap<String, String> {
let query = percent_decode(query);
let mut map = HashMap::new();
for pair in query.split('&') {
let pair = pair.split('=').collect::<Vec<&str>>();
if pair.len() == 2 {
map.insert(pair[0].to_string(), pair[1].to_string());
}
}
return map;
}
fn percent_decode(s: String) -> String {
let len = s.len();
let mut s = s.chars();
let mut result = String::new();
let mut decode = String::new();
let mut i = 0;
while i < len {
let cur = s.nth(0).unwrap();
if cur == '%' {
decode.push(s.nth(0).unwrap());
decode.push(s.nth(0).unwrap());
i += 3;
continue;
}
if decode.len() != 0 {
match decode_hex(&decode) {
Ok(v) => result.push_str(str::from_utf8(&v).unwrap()),
Err(_) => ()
};
decode = String::new();
}
result.push(cur);
i += 1;
}
return result;
}
fn decode_hex(s: &str) -> Result<Vec<u8>, ParseIntError> {
(0..s.len())
.step_by(2)
.map(|i| u8::from_str_radix(&s[i..i + 2], 16))
.collect()
}
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