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use chrono::{DateTime, UTC};
use rustc_serialize::base64::FromBase64;
use std::io::Read;
use std::str::FromStr;
use xml_rs::reader::{EventReader, ParserConfig};
use xml_rs::reader::events::XmlEvent;
use super::super::{ParserError, ParserResult, PlistEvent};
pub struct StreamingParser<R: Read> {
xml_reader: EventReader<R>,
element_stack: Vec<String>
}
impl<R: Read> StreamingParser<R> {
pub fn new(reader: R) -> StreamingParser<R> {
let config = ParserConfig {
trim_whitespace: false,
whitespace_to_characters: true,
cdata_to_characters: true,
ignore_comments: true,
coalesce_characters: true,
};
StreamingParser {
xml_reader: EventReader::with_config(reader, config),
element_stack: Vec::new()
}
}
fn read_content<F>(&mut self, f: F) -> ParserResult<PlistEvent> where F:FnOnce(String) -> ParserResult<PlistEvent> {
match self.xml_reader.next() {
XmlEvent::Characters(s) => f(s),
_ => Err(ParserError::InvalidData)
}
}
}
impl<R: Read> Iterator for StreamingParser<R> {
type Item = ParserResult<PlistEvent>;
fn next(&mut self) -> Option<ParserResult<PlistEvent>> {
loop {
match self.xml_reader.next() {
XmlEvent::StartElement { name, .. } => {
// Add the current element to the element stack
self.element_stack.push(name.local_name.clone());
match &name.local_name[..] {
"plist" => return Some(Ok(PlistEvent::StartPlist)),
"array" => return Some(Ok(PlistEvent::StartArray(None))),
"dict" => return Some(Ok(PlistEvent::StartDictionary(None))),
"key" => return Some(self.read_content(|s| Ok(PlistEvent::StringValue(s)))),
"true" => return Some(Ok(PlistEvent::BooleanValue(true))),
"false" => return Some(Ok(PlistEvent::BooleanValue(false))),
"data" => return Some(self.read_content(|s| {
match FromBase64::from_base64(&s[..]) {
Ok(b) => Ok(PlistEvent::DataValue(b)),
Err(_) => Err(ParserError::InvalidData)
}
})),
"date" => return Some(self.read_content(|s| {
let date = try!(DateTime::parse_from_rfc3339(&s));
Ok(PlistEvent::DateValue(date.with_timezone(&UTC)))
})),
"integer" => return Some(self.read_content(|s| {
match FromStr::from_str(&s) {
Ok(i) => Ok(PlistEvent::IntegerValue(i)),
Err(_) => Err(ParserError::InvalidData)
}
})),
"real" => return Some(self.read_content(|s| {
match FromStr::from_str(&s) {
Ok(f) => Ok(PlistEvent::RealValue(f)),
Err(_) => Err(ParserError::InvalidData)
}
})),
"string" => return Some(self.read_content(|s| Ok(PlistEvent::StringValue(s)))),
_ => return Some(Err(ParserError::InvalidData))
}
},
XmlEvent::EndElement { name, .. } => {
// Check the corrent element is being closed
match self.element_stack.pop() {
Some(ref open_name) if &name.local_name == open_name => (),
Some(ref _open_name) => return Some(Err(ParserError::InvalidData)),
None => return Some(Err(ParserError::InvalidData))
}
match &name.local_name[..] {
"array" => return Some(Ok(PlistEvent::EndArray)),
"dict" => return Some(Ok(PlistEvent::EndDictionary)),
"plist" => return Some(Ok(PlistEvent::EndPlist)),
_ => ()
}
},
XmlEvent::EndDocument => {
match self.element_stack.is_empty() {
true => return None,
false => return Some(Err(ParserError::UnexpectedEof))
}
}
_ => ()
}
}
}
}
#[cfg(test)]
mod tests {
use chrono::{TimeZone, UTC};
use std::fs::File;
use std::path::Path;
use super::*;
use PlistEvent;
#[test]
fn streaming_parser() {
use PlistEvent::*;
let reader = File::open(&Path::new("./tests/data/xml.plist")).unwrap();
let streaming_parser = StreamingParser::new(reader);
let events: Vec<PlistEvent> = streaming_parser.map(|e| e.unwrap()).collect();
let comparison = &[
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("Death".to_owned()),
IntegerValue(1564),
StringValue("Height".to_owned()),
RealValue(1.60),
StringValue("Data".to_owned()),
DataValue(vec![0, 0, 0, 190, 0, 0, 0, 3, 0, 0, 0, 30, 0, 0, 0]),
StringValue("Birthdate".to_owned()),
DateValue(UTC.ymd(1981, 05, 16).and_hms(11, 32, 06)),
EndDictionary,
EndPlist
];
assert_eq!(events, comparison);
}
}
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