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|
use std::collections::BTreeMap;
use std::io::{Read, Seek};
use {ReadError, ReadResult, Plist, PlistEvent, EventReader};
pub type BuilderResult<T> = Result<T, BuilderError>;
#[derive(Debug)]
pub enum BuilderError {
InvalidEvent,
UnsupportedDictionaryKey,
ReadError(ReadError)
}
impl From<ReadError> for BuilderError {
fn from(err: ReadError) -> BuilderError {
BuilderError::ReadError(err)
}
}
pub struct Builder<T> {
stream: T,
token: Option<PlistEvent>,
}
impl<R: Read+Seek> Builder<EventReader<R>> {
pub fn new(reader: R) -> Builder<EventReader<R>> {
Builder::from_event_stream(EventReader::new(reader))
}
}
impl<T:Iterator<Item=ReadResult<PlistEvent>>> Builder<T> {
pub fn from_event_stream(stream: T) -> Builder<T> {
Builder {
stream: stream,
token: None
}
}
pub fn build(mut self) -> BuilderResult<Plist> {
try!(self.bump());
if let Some(PlistEvent::StartPlist) = self.token {
try!(self.bump());
}
let plist = try!(self.build_value());
try!(self.bump());
match self.token {
None => (),
Some(PlistEvent::EndPlist) => try!(self.bump()),
// The stream should have finished
_ => return Err(BuilderError::InvalidEvent)
};
Ok(plist)
}
fn bump(&mut self) -> BuilderResult<()> {
self.token = match self.stream.next() {
Some(Ok(token)) => Some(token),
Some(Err(err)) => return Err(BuilderError::ReadError(err)),
None => None,
};
Ok(())
}
fn build_value(&mut self) -> BuilderResult<Plist> {
match self.token.take() {
Some(PlistEvent::StartPlist) => Err(BuilderError::InvalidEvent),
Some(PlistEvent::EndPlist) => Err(BuilderError::InvalidEvent),
Some(PlistEvent::StartArray(len)) => Ok(Plist::Array(try!(self.build_array(len)))),
Some(PlistEvent::StartDictionary(len)) => Ok(Plist::Dictionary(try!(self.build_dict(len)))),
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(BuilderError::InvalidEvent),
Some(PlistEvent::EndDictionary) => Err(BuilderError::InvalidEvent),
// The stream should not have ended here
None => Err(BuilderError::InvalidEvent)
}
}
fn build_array(&mut self, len: Option<u64>) -> Result<Vec<Plist>, BuilderError> {
let mut values = match len {
Some(len) => Vec::with_capacity(len as usize),
None => Vec::new()
};
loop {
try!(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, _len: Option<u64>) -> Result<BTreeMap<String, Plist>, BuilderError> {
let mut values = BTreeMap::new();
loop {
try!(self.bump());
match self.token.take() {
Some(PlistEvent::EndDictionary) => return Ok(values),
Some(PlistEvent::StringValue(s)) => {
try!(self.bump());
values.insert(s, try!(self.build_value()));
},
_ => {
// Only string keys are supported in plists
return Err(BuilderError::UnsupportedDictionaryKey)
}
}
}
}
}
#[cfg(test)]
mod tests {
use std::collections::BTreeMap;
use super::*;
use Plist;
#[test]
fn builder() {
use PlistEvent::*;
// Input
let events = vec![
StartPlist,
StartDictionary(None),
StringValue("Author".to_owned()),
StringValue("William Shakespeare".to_owned()),
StringValue("Lines".to_owned()),
StartArray(None),
StringValue("It is a tale told by an idiot,".to_owned()),
StringValue("Full of sound and fury, signifying nothing.".to_owned()),
EndArray,
StringValue("Birthdate".to_owned()),
IntegerValue(1564),
StringValue("Height".to_owned()),
RealValue(1.60),
EndDictionary,
EndPlist,
];
let builder = Builder::from_event_stream(events.into_iter().map(|e| Ok(e)));
let plist = builder.build();
// 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 = BTreeMap::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.unwrap(), Plist::Dictionary(dict));
}
}
|
