use std::fmt::{Display, Formatter, Error};
pub use std::collections::btree_map as map;
pub struct Sep<S>(pub &'static str, pub S);
impl<'a,S:Display> Display for Sep<&'a Vec<S>> {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error> {
let &Sep(sep, vec) = self;
let mut elems = vec.iter();
if let Some(elem) = elems.next() {
try!(write!(fmt, "{}", elem));
while let Some(elem) = elems.next() {
try!(write!(fmt, "{}{}", sep, elem));
}
}
Ok(())
}
}
pub struct Escape<S>(pub S);
impl<S:Display> Display for Escape<S> {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error> {
let tmp = format!("{}", self.0);
for c in tmp.chars() {
match c {
'a' ... 'z' | '0' ... '9' | 'A' ... 'Z' => try!(write!(fmt, "{}", c)),
'_' => try!(write!(fmt, "__")),
_ => try!(write!(fmt, "_{:x}", c as usize)),
}
}
Ok(())
}
}
pub struct Prefix<S>(pub &'static str, pub S);
impl<'a,S:Display> Display for Prefix<&'a [S]> {
fn fmt(&self, fmt: &mut Formatter) -> Result<(), Error> {
let &Prefix(prefix, vec) = self;
let mut elems = vec.iter();
while let Some(elem) = elems.next() {
try!(write!(fmt, "{}{}", prefix, elem));
}
Ok(())
}
}
pub fn strip(s: &str) -> &str {
s.trim_matches(char::is_whitespace)
}