88 lines
2.5 KiB
Rust
88 lines
2.5 KiB
Rust
use serde::de;
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use serde::de::value::MapDeserializer;
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use serde::forward_to_deserialize_any;
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use std::collections::HashMap;
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mod error;
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use error::{Error, MpdResult};
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mod structs;
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pub use structs::Track;
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/// some unprintable character to separate repeated keys
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const SEPARATOR: char = '\x02';
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struct MPDeserializer<'de, Iter: Iterator<Item = (&'de str, &'de str)>> {
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inner: MapDeserializer<'de, Iter, Error>,
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}
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impl<'de, Iter: Iterator<Item = (&'de str, &'de str)>> de::Deserializer<'de>
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for MPDeserializer<'de, Iter>
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{
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type Error = Error;
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fn deserialize_any<V>(self, visitor: V) -> MpdResult<V::Value>
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where
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V: de::Visitor<'de>,
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{
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self.deserialize_map(visitor)
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}
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fn deserialize_map<V>(self, visitor: V) -> MpdResult<V::Value>
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where
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V: de::Visitor<'de>,
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{
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visitor.visit_map(self.inner)
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}
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forward_to_deserialize_any! {
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bool char str string bytes byte_buf unit unit_struct seq
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tuple tuple_struct struct identifier ignored_any
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i8 i16 i32 i64 i128 u8 u16 u32 u64 u128 f32 f64 option newtype_struct enum
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}
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}
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fn deserialize_response<'a, I: Iterator<Item = &'a str>>(input: I) -> Result<Track, Error> {
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let mut map: HashMap<String, String> = HashMap::new();
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for line in input {
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if line.starts_with("OK") {
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break;
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} else if let Some(message) = line.strip_prefix("ACK") {
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return Err(Error::from_str(message.trim()));
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}
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let mut fields = line.splitn(2, ": ");
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match (fields.next(), fields.next()) {
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(Some(k), Some(v)) => {
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if let Some(existing) = map.get_mut(k) {
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existing.push(SEPARATOR);
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existing.push_str(v);
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} else {
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map.insert(k.to_string(), v.to_string());
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}
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}
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_ => panic!("invalid response line: {:?}", line),
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}
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}
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return Ok(envy::from_iter(map).unwrap());
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// Eventually, I’d like to use my own deserializer instead of envy
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// let deser = MPDeserializer {
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// inner: MapDeserializer::new(map.into_iter()),
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// };
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// Song::deserialize(deser)
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}
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fn main() {
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let input_str = "file: Youtube Rip/VVVVVV Medley.flac
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Last-Modified: 2018-03-07T13:18:01Z
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Album: VVVVVV OST / PPPPPP
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Artist: FamilyJules7x
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Composer: Magnus Pålsson
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Date: 2014
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Genre: Video Game Music
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Title: VVVVVV Medley
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Time: 433
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duration: 432.727
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Pos: 1548
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Id: 1549";
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let s = deserialize_response(input_str.lines());
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println!("{:?}", s);
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}
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