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use std::borrow::Borrow;
use std::ascii::AsciiExt;
use encoding::EncodingOverride;
use percent_encoding::{percent_encode_to, percent_decode, FORM_URLENCODED_ENCODE_SET};
#[inline]
pub fn parse(input: &[u8]) -> Vec<(String, String)> {
parse_internal(input, EncodingOverride::utf8(), false).unwrap()
}
#[cfg(feature = "query_encoding")]
#[inline]
pub fn parse_with_encoding(input: &[u8], encoding_override: Option<::encoding::EncodingRef>,
use_charset: bool)
-> Option<Vec<(String, String)>> {
parse_internal(input, EncodingOverride::from_opt_encoding(encoding_override), use_charset)
}
fn parse_internal(input: &[u8], mut encoding_override: EncodingOverride, mut use_charset: bool)
-> Option<Vec<(String, String)>> {
let mut pairs = Vec::new();
for piece in input.split(|&b| b == b'&') {
if !piece.is_empty() {
let (name, value) = match piece.iter().position(|b| *b == b'=') {
Some(position) => (&piece[..position], &piece[position + 1..]),
None => (piece, &[][..])
};
#[inline]
fn replace_plus(input: &[u8]) -> Vec<u8> {
input.iter().map(|&b| if b == b'+' { b' ' } else { b }).collect()
}
let name = replace_plus(name);
let value = replace_plus(value);
if use_charset && name == b"_charset_" {
if let Some(encoding) = EncodingOverride::lookup(&value) {
encoding_override = encoding;
}
use_charset = false;
}
pairs.push((name, value));
}
}
if !(encoding_override.is_utf8() || input.is_ascii()) {
return None
}
Some(pairs.into_iter().map(|(name, value)| (
encoding_override.decode(&percent_decode(&name)),
encoding_override.decode(&percent_decode(&value))
)).collect())
}
#[inline]
pub fn serialize<I, K, V>(pairs: I) -> String
where I: IntoIterator, I::Item: Borrow<(K, V)>, K: AsRef<str>, V: AsRef<str> {
serialize_internal(pairs, EncodingOverride::utf8())
}
#[cfg(feature = "query_encoding")]
#[inline]
pub fn serialize_with_encoding<I, K, V>(pairs: I,
encoding_override: Option<::encoding::EncodingRef>)
-> String
where I: IntoIterator, I::Item: Borrow<(K, V)>, K: AsRef<str>, V: AsRef<str> {
serialize_internal(pairs, EncodingOverride::from_opt_encoding(encoding_override))
}
fn serialize_internal<I, K, V>(pairs: I, encoding_override: EncodingOverride) -> String
where I: IntoIterator, I::Item: Borrow<(K, V)>, K: AsRef<str>, V: AsRef<str> {
#[inline]
fn byte_serialize(input: &str, output: &mut String,
encoding_override: EncodingOverride) {
for &byte in encoding_override.encode(input).iter() {
if byte == b' ' {
output.push_str("+")
} else {
percent_encode_to(&[byte], FORM_URLENCODED_ENCODE_SET, output)
}
}
}
let mut output = String::new();
for pair in pairs {
let &(ref name, ref value) = pair.borrow();
if output.len() > 0 {
output.push_str("&");
}
byte_serialize(name.as_ref(), &mut output, encoding_override);
output.push_str("=");
byte_serialize(value.as_ref(), &mut output, encoding_override);
}
output
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_form_urlencoded() {
let pairs = &[
("foo".to_string(), "é&".to_string()),
("bar".to_string(), "".to_string()),
("foo".to_string(), "#".to_string())
];
let encoded = serialize(pairs);
assert_eq!(encoded, "foo=%C3%A9%26&bar=&foo=%23");
assert_eq!(parse(encoded.as_bytes()), pairs.to_vec());
}
#[test]
fn test_form_serialize() {
let pairs = [("foo", "é&"),
("bar", ""),
("foo", "#")];
let want = "foo=%C3%A9%26&bar=&foo=%23";
assert_eq!(serialize(pairs.iter()), want);
assert_eq!(serialize(pairs.iter().map(|p| (p.0, p.1))), want);
}
}