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extern crate csv;
extern crate serde;
#[macro_use]
extern crate serde_derive;
extern crate serde_qs as qs;
#[derive(Debug, Deserialize, Serialize)]
struct Query {
#[serde(deserialize_with="from_csv")]
r: Vec<u8>,
s: u8,
}
fn main() {
let q = "s=12&r=1,2,3";
let q: Query = qs::from_str(&q).unwrap();
println!("{:?}", q);
}
fn from_csv<D>(deserializer: D) -> Result<Vec<u8>, D::Error>
where D: serde::Deserializer
{
deserializer.deserialize_str(CSVVecVisitor)
}
/// Visits a string value of the form "v1,v2,v3" into a vector of bytes Vec<u8>
struct CSVVecVisitor;
impl serde::de::Visitor for CSVVecVisitor {
type Value = Vec<u8>;
fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(formatter, "a str")
}
fn visit_str<E>(self, s: &str) -> std::result::Result<Self::Value, E>
where E: serde::de::Error
{
let mut output = Vec::new();
let mut items = csv::Reader::from_string(s);
// let items = items.next_str();
while let csv::NextField::Data(item) = items.next_str() {
output.push(u8::from_str_radix(item, 10).unwrap());
}
Ok(output)
}
}
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