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use std::fmt;
use std::io;
pub fn escape(s: &str) -> String {
use std::fmt::Write;
let mut buf = String::new();
rt::Escaper { inner: &mut buf }.write_str(s).unwrap();
buf
}
pub struct Markup<F> {
callback: F,
}
impl<F> Markup<F> where F: Fn(&mut fmt::Write) -> fmt::Result {
pub fn render<W: io::Write>(&self, w: &mut W) -> io::Result<()> {
struct Adaptor<'a, W: ?Sized + 'a> {
inner: &'a mut W,
error: io::Result<()>,
}
impl<'a, W: ?Sized + io::Write> fmt::Write for Adaptor<'a, W> {
fn write_str(&mut self, s: &str) -> fmt::Result {
match self.inner.write_all(s.as_bytes()) {
Ok(()) => Ok(()),
Err(e) => {
self.error = Err(e);
Err(fmt::Error)
},
}
}
}
let mut output = Adaptor { inner: w, error: Ok(()) };
match self.render_fmt(&mut output) {
Ok(()) => Ok(()),
Err(_) => output.error,
}
}
pub fn render_fmt(&self, w: &mut fmt::Write) -> fmt::Result {
(self.callback)(w)
}
}
impl<F> ToString for Markup<F> where F: Fn(&mut fmt::Write) -> fmt::Result {
fn to_string(&self) -> String {
let mut buf = String::new();
self.render_fmt(&mut buf).unwrap();
buf
}
}
#[doc(hidden)]
pub mod rt {
use std::fmt;
use super::Markup;
#[inline]
pub fn make_markup<F>(f: F) -> Markup<F> where
F: Fn(&mut fmt::Write) -> fmt::Result
{
Markup { callback: f }
}
pub struct Escaper<'a, 'b: 'a> {
pub inner: &'a mut (fmt::Write + 'b),
}
impl<'a, 'b> fmt::Write for Escaper<'a, 'b> {
fn write_str(&mut self, s: &str) -> fmt::Result {
for c in s.chars() {
try!(match c {
'&' => self.inner.write_str("&"),
'<' => self.inner.write_str("<"),
'>' => self.inner.write_str(">"),
'"' => self.inner.write_str("""),
'\'' => self.inner.write_str("'"),
_ => write!(self.inner, "{}", c),
});
}
Ok(())
}
}
}