7bb498bd7a
This "bubble up an error" macro was originally named if_ok! in order to get it
landed, but after the fact it was discovered that this name is not exactly
desirable.
The name `if_ok!` isn't immediately clear that is has much to do with error
handling, and it doesn't look fantastic in all contexts (if if_ok!(...) {}). In
general, the agreed opinion about `if_ok!` is that is came in as subpar.
The name `try!` is more invocative of error handling, it's shorter by 2 letters,
and it looks fitting in almost all circumstances. One concern about the word
`try!` is that it's too invocative of exceptions, but the belief is that this
will be overcome with documentation and examples.
Close #12037
53 lines
1.9 KiB
Rust
53 lines
1.9 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>(&'a str);
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impl<'a> fmt::Show 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.buf.write(pile_o_bits.slice(last, i).as_bytes()));
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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.buf.write(s.as_bytes()));
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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.buf.write(pile_o_bits.slice_from(last).as_bytes()));
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}
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Ok(())
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}
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}
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