1 files changed, 129 insertions, 0 deletions
diff --git a/third_party/rust/xml-rs/src/reader/mod.rs b/third_party/rust/xml-rs/src/reader/mod.rs
new file mode 100644
index 0000000000..90f5b52c56
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+++ b/third_party/rust/xml-rs/src/reader/mod.rs
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+//! Contains high-level interface for a pull-based XML parser.
+//!
+//! The most important type in this module is `EventReader`, which provides an iterator
+//! view for events in XML document.
+
+use std::io::{Read};
+use std::result;
+
+use common::{Position, TextPosition};
+
+pub use self::config::ParserConfig;
+pub use self::events::XmlEvent;
+
+use self::parser::PullParser;
+
+mod lexer;
+mod parser;
+mod config;
+mod events;
+
+mod error;
+pub use self::error::{Error, ErrorKind};
+
+/// A result type yielded by `XmlReader`.
+pub type Result<T> = result::Result<T, Error>;
+
+/// A wrapper around an `std::io::Read` instance which provides pull-based XML parsing.
+pub struct EventReader<R: Read> {
+    source: R,
+    parser: PullParser
+}
+
+impl<R: Read> EventReader<R> {
+    /// Creates a new reader, consuming the given stream.
+    #[inline]
+    pub fn new(source: R) -> EventReader<R> {
+        EventReader::new_with_config(source, ParserConfig::new())
+    }
+
+    /// Creates a new reader with the provded configuration, consuming the given stream.
+    #[inline]
+    pub fn new_with_config(source: R, config: ParserConfig) -> EventReader<R> {
+        EventReader { source: source, parser: PullParser::new(config) }
+    }
+
+    /// Pulls and returns next XML event from the stream.
+    ///
+    /// If returned event is `XmlEvent::Error` or `XmlEvent::EndDocument`, then
+    /// further calls to this method will return this event again.
+    #[inline]
+    pub fn next(&mut self) -> Result<XmlEvent> {
+        self.parser.next(&mut self.source)
+    }
+
+    pub fn source(&self) -> &R { &self.source }
+    pub fn source_mut(&mut self) -> &mut R { &mut self.source }
+
+    /// Unwraps this `EventReader`, returning the underlying reader.
+    ///
+    /// Note that this operation is destructive; unwrapping the reader and wrapping it
+    /// again with `EventReader::new()` will create a fresh reader which will attempt
+    /// to parse an XML document from the beginning.
+    pub fn into_inner(self) -> R {
+        self.source
+    }
+}
+
+impl<B: Read> Position for EventReader<B> {
+    /// Returns the position of the last event produced by the reader.
+    #[inline]
+    fn position(&self) -> TextPosition {
+        self.parser.position()
+    }
+}
+
+impl<R: Read> IntoIterator for EventReader<R> {
+    type Item = Result<XmlEvent>;
+    type IntoIter = Events<R>;
+
+    fn into_iter(self) -> Events<R> {
+        Events { reader: self, finished: false }
+    }
+}
+
+/// An iterator over XML events created from some type implementing `Read`.
+///
+/// When the next event is `xml::event::Error` or `xml::event::EndDocument`, then
+/// it will be returned by the iterator once, and then it will stop producing events.
+pub struct Events<R: Read> {
+    reader: EventReader<R>,
+    finished: bool
+}
+
+impl<R: Read> Events<R> {
+    /// Unwraps the iterator, returning the internal `EventReader`.
+    #[inline]
+    pub fn into_inner(self) -> EventReader<R> {
+        self.reader
+    }
+
+    pub fn source(&self) -> &R { &self.reader.source }
+    pub fn source_mut(&mut self) -> &mut R { &mut self.reader.source }
+
+}
+
+impl<R: Read> Iterator for Events<R> {
+    type Item = Result<XmlEvent>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Result<XmlEvent>> {
+        if self.finished && !self.reader.parser.is_ignoring_end_of_stream() { None }
+        else {
+            let ev = self.reader.next();
+            match ev {
+                Ok(XmlEvent::EndDocument) | Err(_) => self.finished = true,
+                _ => {}
+            }
+            Some(ev)
+        }
+    }
+}
+
+impl<'r> EventReader<&'r [u8]> {
+    /// A convenience method to create an `XmlReader` from a string slice.
+    #[inline]
+    pub fn from_str(source: &'r str) -> EventReader<&'r [u8]> {
+        EventReader::new(source.as_bytes())
+    }
+}