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use rustc_serialize::base64::FromBase64;
use std::io::Read;
use std::str::FromStr;
use xml::reader::ParserConfig;
use xml::reader::EventReader as XmlEventReader;
use xml::reader::events::XmlEvent;
#[derive(PartialEq, Debug, Clone)]
pub enum PlistEvent {
StartArray,
EndArray,
StartDictionary,
EndDictionary,
DictionaryKey(String),
BooleanValue(bool),
DataValue(Vec<u8>),
DateValue(String),
FloatValue(f64),
IntegerValue(i64),
StringValue(String),
Error(())
}
pub struct EventReader<R: Read> {
xml_reader: XmlEventReader<R>
}
impl<R: Read> EventReader<R> {
pub fn new(reader: R) -> EventReader<R> {
let config = ParserConfig {
trim_whitespace: false,
whitespace_to_characters: true,
cdata_to_characters: true,
ignore_comments: true,
coalesce_characters: true,
};
EventReader {
xml_reader: XmlEventReader::with_config(reader, config)
}
}
fn read_string<F>(&mut self, f: F) -> PlistEvent where F:FnOnce(String) -> PlistEvent {
match self.xml_reader.next() {
XmlEvent::Characters(s) => f(s),
_ => PlistEvent::Error(())
}
}
}
impl<R: Read> Iterator for EventReader<R> {
type Item = PlistEvent;
fn next(&mut self) -> Option<PlistEvent> {
loop {
let first_event = self.xml_reader.next();
match first_event {
XmlEvent::StartElement { name, .. } => match &name.local_name[..] {
"plist" => (),
"array" => return Some(PlistEvent::StartArray),
"dict" => return Some(PlistEvent::StartDictionary),
"key" => return Some(self.read_string(|s| PlistEvent::DictionaryKey(s))),
"true" => return Some(PlistEvent::BooleanValue(true)),
"false" => return Some(PlistEvent::BooleanValue(false)),
"data" => return Some(self.read_string(|s| {
match FromBase64::from_base64(&s[..]) {
Ok(b) => PlistEvent::DataValue(b),
Err(_) => PlistEvent::Error(())
}
})),
"date" => return Some(self.read_string(|s| PlistEvent::DateValue(s))),
"integer" => return Some(self.read_string(|s| {
match FromStr::from_str(&s) {
Ok(i) => PlistEvent::IntegerValue(i),
Err(_) => PlistEvent::Error(())
}
})),
"real" => return Some(self.read_string(|s| {
match FromStr::from_str(&s) {
Ok(f) => PlistEvent::FloatValue(f),
Err(_) => PlistEvent::Error(())
}
})),
"string" => return Some(self.read_string(|s| PlistEvent::StringValue(s))),
_ => return Some(PlistEvent::Error(()))
},
XmlEvent::EndElement { name, .. } => match &name.local_name[..] {
"array" => return Some(PlistEvent::EndArray),
"dict" => return Some(PlistEvent::EndDictionary),
_ => ()
},
XmlEvent::EndDocument => return None,
_ => ()
}
}
}
}
#[cfg(test)]
mod tests {
use std::fs::File;
use std::path::Path;
use reader::*;
#[test]
fn simple() {
use reader::PlistEvent::*;
let reader = File::open(&Path::new("./tests/data/simple.plist")).unwrap();
let event_reader = EventReader::new(reader);
let events: Vec<PlistEvent> = event_reader.collect();
let comparison = &[
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),
EndDictionary
];
assert_eq!(events, comparison);
}
}
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