From 094994360a7eb81eb545fccfe73e80765be71fd3 Mon Sep 17 00:00:00 2001
From: Edward Barnard
Date: Tue, 4 Aug 2015 17:24:37 +0100
Subject: More parsing

---
 src/reader.rs | 136 +++++++++++++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 121 insertions(+), 15 deletions(-)

(limited to 'src/reader.rs')

diff --git a/src/reader.rs b/src/reader.rs
index 64e666e..6055b74 100644
--- a/src/reader.rs
+++ b/src/reader.rs
@@ -1,11 +1,13 @@
 use rustc_serialize::base64::FromBase64;
+use std::collections::HashMap;
 use std::io::Read;
 use std::str::FromStr;
-use xml::reader::ParserConfig;
-use xml::reader::EventReader as XmlEventReader;
+use xml::reader::{EventReader, ParserConfig};
 use xml::reader::events::XmlEvent;
 
-#[derive(PartialEq, Debug, Clone)]
+use super::Plist;
+
+#[derive(Clone, Debug, PartialEq)]
 pub enum PlistEvent {
 	StartArray,
 	EndArray,
@@ -17,19 +19,19 @@ pub enum PlistEvent {
 	BooleanValue(bool),
 	DataValue(Vec<u8>),
 	DateValue(String),
-	FloatValue(f64),
 	IntegerValue(i64),
+	RealValue(f64),
 	StringValue(String),
 
 	Error(())
 }
 
-pub struct EventReader<R: Read> {
-	xml_reader: XmlEventReader<R>
+pub struct StreamingParser<R: Read> {
+	xml_reader: EventReader<R>
 }
 
-impl<R: Read> EventReader<R> {
-	pub fn new(reader: R) -> EventReader<R> {
+impl<R: Read> StreamingParser<R> {
+	pub fn new(reader: R) -> StreamingParser<R> {
 		let config = ParserConfig {
 			trim_whitespace: false,
 			whitespace_to_characters: true,
@@ -38,8 +40,8 @@ impl<R: Read> EventReader<R> {
 			coalesce_characters: true,
 		};
 
-		EventReader {
-			xml_reader: XmlEventReader::with_config(reader, config)
+		StreamingParser {
+			xml_reader: EventReader::with_config(reader, config)
 		}
 	}
 
@@ -51,7 +53,7 @@ impl<R: Read> EventReader<R> {
 	}
 }
 
-impl<R: Read> Iterator for EventReader<R> {
+impl<R: Read> Iterator for StreamingParser<R> {
 	type Item = PlistEvent;
 
 	fn next(&mut self) -> Option<PlistEvent> {
@@ -80,7 +82,7 @@ impl<R: Read> Iterator for EventReader<R> {
 					})),
 					"real" => return Some(self.read_string(|s| {
 						match FromStr::from_str(&s)	{
-							Ok(f) => PlistEvent::FloatValue(f),
+							Ok(f) => PlistEvent::RealValue(f),
 							Err(_) => PlistEvent::Error(())
 						}
 					})),
@@ -99,20 +101,103 @@ impl<R: Read> Iterator for EventReader<R> {
 	}
 }
 
+pub struct Parser<R: Read> {
+	reader: StreamingParser<R>,
+	token: Option<PlistEvent>,
+}
+
+impl<R: Read> Parser<R> {
+	pub fn new(reader: R) -> Parser<R> {
+		Parser {
+			reader: StreamingParser::new(reader),
+			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::fs::File;
+	use std::collections::HashMap;
 	use std::path::Path;
 
 	use reader::*;
+	use super::super::Plist;
 
 	#[test]
-	fn simple() {
+	fn streaming_parser() {
 		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 streaming_parser = StreamingParser::new(reader);
+		let events: Vec<PlistEvent> = streaming_parser.collect();
 
 		let comparison = &[
 			StartDictionary,
@@ -125,9 +210,30 @@ mod tests {
 			EndArray,
 			DictionaryKey("Birthdate".to_owned()),
 			IntegerValue(1564),
+			DictionaryKey("Height".to_owned()),
+			RealValue(1.60),
 			EndDictionary
 		];
 
 		assert_eq!(events, comparison);
 	}
+
+	#[test]
+	fn parser() {
+		let reader = File::open(&Path::new("./tests/data/simple.plist")).unwrap();
+		let parser = Parser::new(reader);
+		let plist = parser.parse();
+
+		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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