rxml — Restricted, minimalistic XML 1.0 parser

This crate provides "restricted" parsing of XML 1.0 documents with namespacing.

Features (some call them restrictions)

• No external resources
• No custom entities
• No DTD whatsoever
• No processing instructions
• No comments
• UTF-8 only
• Namespacing-well-formedness enforced
• XML 1.0 only
• Streamed parsing (parser emits a subset of SAX events)
• Streamed encoding
• Parser can be driven push- and pull-based
• Tokio-based asynchronicity supported via the async feature and AsyncReader.

Examples

Parse data from byte slices

To parse a XML document from a byte slice (or a series of byte slices), you can use the Parser with the Parse trait directly:

use rxml::{Parser, Parse, Error, ResolvedEvent, XmlVersion};
use std::io;
let mut doc = &b"<?xml version='1.0'?><hello>World!</hello>"[..];
let mut fp = Parser::new();
while doc.len() > 0 {
	let ev = fp.parse(&mut doc, true);  // true = doc contains the entire document
	println!("got event: {:?}", ev);
}

Parse data from a standard library reader

To parse a XML document from a std::io::BufRead struct, you can use the Reader.

# use std::io::BufReader;
# let file = &mut &b"<?xml version='1.0'?><hello>World!</hello>"[..];
// let file = std::fs::File::open(..).unwrap();
let reader = BufReader::new(file);
let mut reader = rxml::Reader::<_>::new(reader);
let result = rxml::as_eof_flag(reader.read_all(|ev| {
	println!("got event: {:?}", ev);
}));
assert_eq!(result.unwrap(), true);  // true indicates eof

Parse data using tokio

To parse a XML document from a tokio::io::AsyncBufRead struct, you can use the AsyncReader.

This requires the async feature.

# use tokio::io::AsyncRead;
use rxml::{AsyncReader, Error, ResolvedEvent, XmlVersion};
# tokio_test::block_on(async {
# let sock = &mut &b"<?xml version='1.0'?><hello>World!</hello>"[..];
// let sock = ..;
let reader = tokio::io::BufReader::new(sock);
// this converts the doc into an tokio::io::AsyncRead
let mut reader = AsyncReader::<_>::new(reader);
// we expect the first event to be the XML declaration
let ev = reader.read().await;
assert!(matches!(ev.unwrap().unwrap(), ResolvedEvent::XmlDeclaration(_, XmlVersion::V1_0)));
# })

Feature flags

• macros: Enable macros to convert &str to &NameStr, &NcNameStr and &CDataStr respectively.
• smartstring (default): Enable the use of smartstring for some string types to avoid allocations and conserve heap memory.
• tokio (default): Enable AsyncReader and related types. Implies sync.
• sync (default): Use Arc instead of Rc for deduplicated namespace URIs.
• stream: Add a futures::Stream implementation to AsyncReader. Implies tokio.
• shared_ns: Allow deduplication of namespace URIs within and across parsers.