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extern crate rustc_serialize;
extern crate xml as xml_rs;
pub mod xml;
use std::collections::HashMap;
use std::io::Read;
#[derive(Clone, Debug, PartialEq)]
pub enum Plist {
Array(Vec<Plist>),
Dictionary(HashMap<String, Plist>),
Boolean(bool),
Data(Vec<u8>),
Date(String),
Real(f64),
Integer(i64),
String(String)
}
#[derive(Clone, Debug, PartialEq)]
pub enum PlistEvent {
StartArray,
EndArray,
StartDictionary,
EndDictionary,
DictionaryKey(String),
BooleanValue(bool),
DataValue(Vec<u8>),
DateValue(String),
IntegerValue(i64),
RealValue(f64),
StringValue(String),
Error(())
}
pub enum StreamingParser<R: Read> {
Xml(xml::StreamingParser<R>)
}
impl<R:Read> StreamingParser<R> {
pub fn new() -> StreamingParser<R> {
panic!()
}
}
impl<R:Read> Iterator for StreamingParser<R> {
type Item = PlistEvent;
fn next(&mut self) -> Option<PlistEvent> {
match *self {
StreamingParser::Xml(ref mut parser) => parser.next()
}
}
}
pub struct Parser<T> {
reader: T,
token: Option<PlistEvent>,
}
impl<R:Read> Parser<StreamingParser<R>> {
pub fn new(reader: R) -> Parser<StreamingParser<R>> {
Parser::from_event_stream(StreamingParser::Xml(xml::StreamingParser::new(reader)))
}
}
impl<T:Iterator<Item=PlistEvent>> Parser<T> {
pub fn from_event_stream(stream: T) -> Parser<T> {
Parser {
reader: stream,
token: None
}
}
pub fn parse(mut self) -> Result<Plist, ()> {
self.bump();
let plist = try!(self.build_value());
self.bump();
match self.token {
None => (),
_ => return Err(())
};
Ok(plist)
}
fn bump(&mut self) {
self.token = self.reader.next();
}
fn build_value(&mut self) -> Result<Plist, ()> {
match self.token.take() {
Some(PlistEvent::StartArray) => Ok(Plist::Array(try!(self.build_array()))),
Some(PlistEvent::StartDictionary) => Ok(Plist::Dictionary(try!(self.build_dict()))),
Some(PlistEvent::BooleanValue(b)) => Ok(Plist::Boolean(b)),
Some(PlistEvent::DataValue(d)) => Ok(Plist::Data(d)),
Some(PlistEvent::DateValue(d)) => Ok(Plist::Date(d)),
Some(PlistEvent::IntegerValue(i)) => Ok(Plist::Integer(i)),
Some(PlistEvent::RealValue(f)) => Ok(Plist::Real(f)),
Some(PlistEvent::StringValue(s)) => Ok(Plist::String(s)),
Some(PlistEvent::EndArray) => Err(()),
Some(PlistEvent::EndDictionary) => Err(()),
Some(PlistEvent::DictionaryKey(_)) => Err(()),
Some(PlistEvent::Error(_)) => Err(()),
None => Err(())
}
}
fn build_array(&mut self) -> Result<Vec<Plist>, ()> {
let mut values = Vec::new();
loop {
self.bump();
if let Some(PlistEvent::EndArray) = self.token {
self.token.take();
return Ok(values);
}
values.push(try!(self.build_value()));
}
}
fn build_dict(&mut self) -> Result<HashMap<String, Plist>, ()> {
let mut values = HashMap::new();
loop {
self.bump();
match self.token.take() {
Some(PlistEvent::EndDictionary) => return Ok(values),
Some(PlistEvent::DictionaryKey(s)) => {
self.bump();
values.insert(s, try!(self.build_value()));
},
_ => {
return Err(())
}
}
}
}
}
#[cfg(test)]
mod tests {
use std::collections::HashMap;
use super::*;
#[test]
fn parser() {
use super::PlistEvent::*;
// Input
let events = &[
StartDictionary,
DictionaryKey("Author".to_owned()),
StringValue("William Shakespeare".to_owned()),
DictionaryKey("Lines".to_owned()),
StartArray,
StringValue("It is a tale told by an idiot,".to_owned()),
StringValue("Full of sound and fury, signifying nothing.".to_owned()),
EndArray,
DictionaryKey("Birthdate".to_owned()),
IntegerValue(1564),
DictionaryKey("Height".to_owned()),
RealValue(1.60),
EndDictionary
];
let parser = Parser::from_event_stream(events.into_iter().cloned());
let plist = parser.parse();
// Expected output
let mut lines = Vec::new();
lines.push(Plist::String("It is a tale told by an idiot,".to_owned()));
lines.push(Plist::String("Full of sound and fury, signifying nothing.".to_owned()));
let mut dict = HashMap::new();
dict.insert("Author".to_owned(), Plist::String("William Shakespeare".to_owned()));
dict.insert("Lines".to_owned(), Plist::Array(lines));
dict.insert("Birthdate".to_owned(), Plist::Integer(1564));
dict.insert("Height".to_owned(), Plist::Real(1.60));
assert_eq!(plist, Ok(Plist::Dictionary(dict)));
}
}
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