44440e5c18
fmt::Show is for debugging, and can and should be implemented for
all public types. This trait is used with `{:?}` syntax. There still
exists #[derive(Show)].
fmt::String is for types that faithfully be represented as a String.
Because of this, there is no way to derive fmt::String, all
implementations must be purposeful. It is used by the default format
syntax, `{}`.
This will break most instances of `{}`, since that now requires the type
to impl fmt::String. In most cases, replacing `{}` with `{:?}` is the
correct fix. Types that were being printed specifically for users should
receive a fmt::String implementation to fix this.
Part of #20013
[breaking-change]
61 lines
2.1 KiB
Rust
61 lines
2.1 KiB
Rust
// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! HTML Escaping
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//!
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//! This module contains one unit-struct which can be used to HTML-escape a
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//! string of text (for use in a format string).
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use std::fmt;
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/// Wrapper struct which will emit the HTML-escaped version of the contained
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/// string when passed to a format string.
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pub struct Escape<'a>(pub &'a str);
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//NOTE(stage0): remove impl after snapshot
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#[cfg(stage0)]
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impl<'a> fmt::Show for Escape<'a> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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fmt::String::fmt(self, f)
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}
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}
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impl<'a> fmt::String for Escape<'a> {
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fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
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// Because the internet is always right, turns out there's not that many
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// characters to escape: http://stackoverflow.com/questions/7381974
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let Escape(s) = *self;
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let pile_o_bits = s.as_slice();
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let mut last = 0;
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for (i, ch) in s.bytes().enumerate() {
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match ch as char {
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'<' | '>' | '&' | '\'' | '"' => {
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try!(fmt.write_str(pile_o_bits.slice(last, i)));
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let s = match ch as char {
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'>' => ">",
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'<' => "<",
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'&' => "&",
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'\'' => "'",
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'"' => """,
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_ => unreachable!()
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};
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try!(fmt.write_str(s));
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last = i + 1;
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}
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_ => {}
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}
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}
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if last < s.len() {
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try!(fmt.write_str(pile_o_bits.slice_from(last)));
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}
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Ok(())
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}
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}
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