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Diffstat (limited to '')
-rw-r--r-- | vendor/html5ever/src/util/str.rs | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/vendor/html5ever/src/util/str.rs b/vendor/html5ever/src/util/str.rs new file mode 100644 index 000000000..756a88d25 --- /dev/null +++ b/vendor/html5ever/src/util/str.rs @@ -0,0 +1,42 @@ +// Copyright 2014-2017 The html5ever Project Developers. See the +// COPYRIGHT file at the top-level directory of this distribution. +// +// 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 std::fmt; + +pub fn to_escaped_string<T: fmt::Debug>(x: &T) -> String { + // FIXME: don't allocate twice + let string = format!("{:?}", x); + string.chars().flat_map(|c| c.escape_default()).collect() +} + +/// If `c` is an ASCII letter, return the corresponding lowercase +/// letter, otherwise None. +pub fn lower_ascii_letter(c: char) -> Option<char> { + match c { + 'a'..='z' => Some(c), + 'A'..='Z' => Some((c as u8 - b'A' + b'a') as char), + _ => None, + } +} + +#[cfg(test)] +#[allow(non_snake_case)] +mod test { + use super::lower_ascii_letter; + use mac::test_eq; + + test_eq!(lower_letter_a_is_a, lower_ascii_letter('a'), Some('a')); + test_eq!(lower_letter_A_is_a, lower_ascii_letter('A'), Some('a')); + test_eq!(lower_letter_symbol_is_None, lower_ascii_letter('!'), None); + test_eq!( + lower_letter_nonascii_is_None, + lower_ascii_letter('\u{a66e}'), + None + ); +} |