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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use syntax::ast::Visibility;
#[inline]
pub fn prev_char(s: &str, mut i: usize) -> usize {
if i == 0 { return 0; }
i -= 1;
while !s.is_char_boundary(i) {
i -= 1;
}
i
}
#[inline]
pub fn next_char(s: &str, mut i: usize) -> usize {
if i >= s.len() { return s.len(); }
while !s.is_char_boundary(i) {
i += 1;
}
i
}
#[inline]
pub fn make_indent(width: usize) -> String {
let mut indent = String::with_capacity(width);
for _ in 0..width {
indent.push(' ')
}
indent
}
#[inline]
pub fn format_visibility(vis: Visibility) -> &'static str {
match vis {
Visibility::Public => "pub ",
Visibility::Inherited => ""
}
}
// Macro for deriving implementations of Decodable for enums
#[macro_export]
macro_rules! impl_enum_decodable {
( $e:ident, $( $x:ident ),* ) => {
impl Decodable for $e {
fn decode<D: Decoder>(d: &mut D) -> Result<Self, D::Error> {
let s = try!(d.read_str());
match &*s {
$(
stringify!($x) => Ok($e::$x),
)*
_ => Err(d.error("Bad variant")),
}
}
}
};
}
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