| // Copyright 2013 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. |
| |
| //! HTML Escaping |
| //! |
| //! This module contains one unit-struct which can be used to HTML-escape a |
| //! string of text (for use in a format string). |
| |
| use std::fmt; |
| |
| /// Wrapper struct which will emit the HTML-escaped version of the contained |
| /// string when passed to a format string. |
| pub struct Escape<'a>(pub &'a str); |
| |
| impl<'a> fmt::Display for Escape<'a> { |
| fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { |
| // Because the internet is always right, turns out there's not that many |
| // characters to escape: http://stackoverflow.com/questions/7381974 |
| let Escape(s) = *self; |
| let pile_o_bits = s; |
| let mut last = 0; |
| for (i, ch) in s.bytes().enumerate() { |
| match ch as char { |
| '<' | '>' | '&' | '\'' | '"' => { |
| fmt.write_str(&pile_o_bits[last..i])?; |
| let s = match ch as char { |
| '>' => ">", |
| '<' => "<", |
| '&' => "&", |
| '\'' => "'", |
| '"' => """, |
| _ => unreachable!(), |
| }; |
| fmt.write_str(s)?; |
| last = i + 1; |
| } |
| _ => {} |
| } |
| } |
| |
| if last < s.len() { |
| fmt.write_str(&pile_o_bits[last..])?; |
| } |
| Ok(()) |
| } |
| } |
