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use QualName;
pub use markup5ever::serialize::{Serialize, Serializer, TraversalScope, AttrRef};
use std::io::{self, Write};
use tree_builder::NamespaceMap;
#[derive(Clone)]
pub struct SerializeOpts {
pub traversal_scope: TraversalScope,
}
impl Default for SerializeOpts {
fn default() -> SerializeOpts {
SerializeOpts {
traversal_scope: TraversalScope::ChildrenOnly(None)
}
}
}
pub fn serialize<Wr, T> (writer: Wr, node: &T, opts: SerializeOpts) -> io::Result<()>
where Wr: Write, T: Serialize {
let mut ser = XmlSerializer::new(writer);
node.serialize(&mut ser, opts.traversal_scope)
}
pub struct XmlSerializer<Wr> {
writer: Wr,
namespace_stack: NamespaceMapStack,
}
#[derive(Debug)]
struct NamespaceMapStack(Vec<NamespaceMap>);
impl NamespaceMapStack {
fn new() -> NamespaceMapStack {
NamespaceMapStack(vec![])
}
fn push(&mut self, namespace: NamespaceMap) {
self.0.push(namespace);
}
fn pop(&mut self) {
self.0.pop();
}
}
fn write_to_buf_escaped<W: Write>(writer: &mut W, text: &str, attr_mode: bool) -> io::Result<()> {
for c in text.chars() {
try!(match c {
'&' => writer.write_all(b"&"),
'\'' if attr_mode => writer.write_all(b"'"),
'"' if attr_mode => writer.write_all(b"""),
'<' if !attr_mode => writer.write_all(b"<"),
'>' if !attr_mode => writer.write_all(b">"),
c => writer.write_fmt(format_args!("{}", c)),
});
}
Ok(())
}
#[inline]
fn write_qual_name<W: Write>(writer: &mut W, name: &QualName) -> io::Result<()> {
if let Some(ref prefix) = name.prefix {
try!(writer.write_all(&prefix.as_bytes()));
try!(writer.write_all(b":"));
try!(writer.write_all(&*name.local.as_bytes()));
} else {
try!(writer.write_all(&*name.local.as_bytes()));
}
Ok(())
}
impl<Wr: Write> XmlSerializer<Wr> {
pub fn new(writer: Wr) -> Self {
XmlSerializer {
writer: writer,
namespace_stack: NamespaceMapStack::new(),
}
}
#[inline(always)]
fn qual_name(&mut self, name: &QualName) -> io::Result<()> {
self.find_or_insert_ns(name);
write_qual_name(&mut self.writer, name)
}
#[inline(always)]
fn qual_attr_name(&mut self, name: &QualName) -> io::Result<()> {
self.find_or_insert_ns(name);
write_qual_name(&mut self.writer, name)
}
fn find_uri(&self, name: &QualName) -> bool {
let mut found = false;
for stack in self.namespace_stack.0.iter().rev() {
if let Some(&Some(ref el)) = stack.get(&name.prefix) {
found = *el == name.ns;
break;
}
}
found
}
fn find_or_insert_ns(&mut self, name: &QualName) {
if name.prefix.is_some() || &*name.ns != "" {
if !self.find_uri(name) {
if let Some(last_ns) = self.namespace_stack.0.last_mut() {
last_ns.insert(name);
}
}
}
}
}
impl<Wr: Write> Serializer for XmlSerializer<Wr> {
fn start_elem<'a, AttrIter>(&mut self, name: QualName, attrs: AttrIter) -> io::Result<()>
where AttrIter: Iterator<Item=AttrRef<'a>> {
self.namespace_stack.push(NamespaceMap::empty());
try!(self.writer.write_all(b"<"));
try!(self.qual_name(&name));
if let Some(current_namespace) = self.namespace_stack.0.last() {
for (prefix, url_opt) in current_namespace.get_scope_iter() {
try!(self.writer.write_all(b" xmlns"));
if let &Some(ref p) = prefix {
try!(self.writer.write_all(b":"));
try!(self.writer.write_all(&*p.as_bytes()));
}
try!(self.writer.write_all(b"=\""));
let url = if let &Some(ref a) = url_opt {
a.as_bytes()
} else {
b""
};
try!(self.writer.write_all(url));
try!(self.writer.write_all(b"\""));
}
}
for (name, value) in attrs {
try!(self.writer.write_all(b" "));
try!(self.qual_attr_name(&name));
try!(self.writer.write_all(b"=\""));
try!(write_to_buf_escaped(&mut self.writer, value, true));
try!(self.writer.write_all(b"\""));
}
try!(self.writer.write_all(b">"));
Ok(())
}
fn end_elem(&mut self, name: QualName) -> io::Result<()> {
self.namespace_stack.pop();
try!(self.writer.write_all(b"</"));
try!(self.qual_name(&name));
self.writer.write_all(b">")
}
fn write_comment(&mut self, text: &str) -> io::Result<()> {
try!(self.writer.write_all(b"<!--"));
try!(self.writer.write_all(text.as_bytes()));
self.writer.write_all(b"-->")
}
fn write_doctype(&mut self, name: &str) -> io::Result<()> {
try!(self.writer.write_all(b"<!DOCTYPE "));
try!(self.writer.write_all(name.as_bytes()));
self.writer.write_all(b">")
}
fn write_text(&mut self, text: &str) -> io::Result<()> {
write_to_buf_escaped(&mut self.writer, text, false)
}
fn write_processing_instruction(&mut self, target: &str, data: &str) -> io::Result<()> {
try!(self.writer.write_all(b"<?"));
try!(self.writer.write_all(target.as_bytes()));
try!(self.writer.write_all(b" "));
try!(self.writer.write_all(data.as_bytes()));
self.writer.write_all(b"?>")
}
}