pub use markup5ever::serialize::{Serialize, Serializer, TraversalScope, AttrRef};
use std::io::{self, Write};
use std::default::Default;
use {LocalName, QualName};
pub fn serialize<Wr, T>(writer: Wr, node: &T, opts: SerializeOpts) -> io::Result<()>
where Wr: Write, T: Serialize {
let mut ser = HtmlSerializer::new(writer, opts);
node.serialize(&mut ser, opts.traversal_scope)
}
#[derive(Copy, Clone)]
pub struct SerializeOpts {
pub scripting_enabled: bool,
pub traversal_scope: TraversalScope,
}
impl Default for SerializeOpts {
fn default() -> SerializeOpts {
SerializeOpts {
scripting_enabled: true,
traversal_scope: TraversalScope::ChildrenOnly,
}
}
}
struct ElemInfo {
html_name: Option<LocalName>,
ignore_children: bool,
processed_first_child: bool,
}
struct HtmlSerializer<Wr: Write> {
writer: Wr,
opts: SerializeOpts,
stack: Vec<ElemInfo>,
}
fn tagname(name: &QualName) -> LocalName {
match name.ns {
ns!(html) | ns!(mathml) | ns!(svg) => (),
ref ns => {
warn!("node with weird namespace {:?}", ns);
}
}
name.local.clone()
}
impl<Wr: Write> HtmlSerializer<Wr> {
fn new(writer: Wr, opts: SerializeOpts) -> Self {
HtmlSerializer {
writer: writer,
opts: opts,
stack: vec!(ElemInfo {
html_name: None,
ignore_children: false,
processed_first_child: false,
}),
}
}
fn parent(&mut self) -> &mut ElemInfo {
self.stack.last_mut().expect("no parent ElemInfo")
}
fn write_escaped(&mut self, text: &str, attr_mode: bool) -> io::Result<()> {
for c in text.chars() {
try!(match c {
'&' => self.writer.write_all(b"&"),
'\u{00A0}' => self.writer.write_all(b" "),
'"' if attr_mode => self.writer.write_all(b"""),
'<' if !attr_mode => self.writer.write_all(b"<"),
'>' if !attr_mode => self.writer.write_all(b">"),
c => self.writer.write_fmt(format_args!("{}", c)),
});
}
Ok(())
}
}
impl<Wr: Write> Serializer for HtmlSerializer<Wr> {
fn start_elem<'a, AttrIter>(&mut self, name: QualName, attrs: AttrIter) -> io::Result<()>
where AttrIter: Iterator<Item=AttrRef<'a>> {
let html_name = match name.ns {
ns!(html) => Some(name.local.clone()),
_ => None,
};
if self.parent().ignore_children {
self.stack.push(ElemInfo {
html_name: html_name,
ignore_children: true,
processed_first_child: false,
});
return Ok(());
}
try!(self.writer.write_all(b"<"));
try!(self.writer.write_all(tagname(&name).as_bytes()));
for (name, value) in attrs {
try!(self.writer.write_all(b" "));
match name.ns {
ns!() => (),
ns!(xml) => try!(self.writer.write_all(b"xml:")),
ns!(xmlns) => {
if name.local != local_name!("xmlns") {
try!(self.writer.write_all(b"xmlns:"));
}
}
ns!(xlink) => try!(self.writer.write_all(b"xlink:")),
ref ns => {
warn!("attr with weird namespace {:?}", ns);
try!(self.writer.write_all(b"unknown_namespace:"));
}
}
try!(self.writer.write_all(name.local.as_bytes()));
try!(self.writer.write_all(b"=\""));
try!(self.write_escaped(value, true));
try!(self.writer.write_all(b"\""));
}
try!(self.writer.write_all(b">"));
let ignore_children = name.ns == ns!(html) && match name.local {
local_name!("area") | local_name!("base") | local_name!("basefont") | local_name!("bgsound") | local_name!("br")
| local_name!("col") | local_name!("embed") | local_name!("frame") | local_name!("hr") | local_name!("img")
| local_name!("input") | local_name!("keygen") | local_name!("link")
| local_name!("meta") | local_name!("param") | local_name!("source") | local_name!("track") | local_name!("wbr")
=> true,
_ => false,
};
self.parent().processed_first_child = true;
self.stack.push(ElemInfo {
html_name: html_name,
ignore_children: ignore_children,
processed_first_child: false,
});
Ok(())
}
fn end_elem(&mut self, name: QualName) -> io::Result<()> {
let info = self.stack.pop().expect("no ElemInfo");
if info.ignore_children {
return Ok(());
}
try!(self.writer.write_all(b"</"));
try!(self.writer.write_all(tagname(&name).as_bytes()));
self.writer.write_all(b">")
}
fn write_text(&mut self, text: &str) -> io::Result<()> {
let prepend_lf = text.starts_with("\n") && {
let parent = self.parent();
!parent.processed_first_child && match parent.html_name {
Some(local_name!("pre")) | Some(local_name!("textarea")) | Some(local_name!("listing")) => true,
_ => false,
}
};
if prepend_lf {
try!(self.writer.write_all(b"\n"));
}
let escape = match self.parent().html_name {
Some(local_name!("style")) | Some(local_name!("script")) | Some(local_name!("xmp"))
| Some(local_name!("iframe")) | Some(local_name!("noembed")) | Some(local_name!("noframes"))
| Some(local_name!("plaintext")) => false,
Some(local_name!("noscript")) => !self.opts.scripting_enabled,
_ => true,
};
if escape {
self.write_escaped(text, false)
} else {
self.writer.write_all(text.as_bytes())
}
}
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_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">")
}
}