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use std::collections::HashSet;
use std::convert::TryFrom;
use std::fmt::Write;
use super::context::Context;
use super::error::Error;
use super::percent_encoded_character_decoder::PercentEncodedCharacterDecoder;
pub fn decode_element<T>(
element: T,
allowed_characters: &'static HashSet<char>,
context: Context
) -> Result<Vec<u8>, Error>
where T: AsRef<str>
{
let mut decoding_pec = false;
let mut pec_decoder = PercentEncodedCharacterDecoder::new();
element
.as_ref()
.chars()
.filter_map(|c| {
if decoding_pec {
pec_decoder
.next(c)
.map_err(Into::into)
.transpose()
.map(|c| {
decoding_pec = false;
c
})
} else if c == '%' {
decoding_pec = true;
None
} else if allowed_characters.contains(&c) {
Some(Ok(c as u8))
} else {
Some(Err(Error::IllegalCharacter(context)))
}
})
.collect()
}
pub fn encode_element(
element: &[u8],
allowed_characters: &HashSet<char>
) -> String {
let mut encoding = String::with_capacity(element.len());
for ci in element {
match char::try_from(*ci) {
Ok(c) if allowed_characters.contains(&c) => encoding.push(c),
_ => write!(encoding, "%{:02X}", ci).unwrap(),
}
}
encoding
}
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