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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 17:32:43 +0000 |
commit | 6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch) | |
tree | a68f146d7fa01f0134297619fbe7e33db084e0aa /servo/components/style/properties_and_values/syntax/ascii.rs | |
parent | Initial commit. (diff) | |
download | thunderbird-upstream.tar.xz thunderbird-upstream.zip |
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'servo/components/style/properties_and_values/syntax/ascii.rs')
-rw-r--r-- | servo/components/style/properties_and_values/syntax/ascii.rs | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/servo/components/style/properties_and_values/syntax/ascii.rs b/servo/components/style/properties_and_values/syntax/ascii.rs new file mode 100644 index 0000000000..e1a1b08535 --- /dev/null +++ b/servo/components/style/properties_and_values/syntax/ascii.rs @@ -0,0 +1,60 @@ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at https://mozilla.org/MPL/2.0/. */ + +/// Trims ASCII whitespace characters from a slice, and returns the trimmed input. +pub fn trim_ascii_whitespace(input: &str) -> &str { + if input.is_empty() { + return input; + } + + let mut start = 0; + { + let mut iter = input.as_bytes().iter(); + loop { + let byte = match iter.next() { + Some(b) => b, + None => return "", + }; + + if !byte.is_ascii_whitespace() { + break; + } + start += 1; + } + } + + let mut end = input.len(); + assert!(start < end); + { + let mut iter = input.as_bytes()[start..].iter().rev(); + loop { + let byte = match iter.next() { + Some(b) => b, + None => { + debug_assert!(false, "We should have caught this in the loop above!"); + return ""; + }, + }; + + if !byte.is_ascii_whitespace() { + break; + } + end -= 1; + } + } + + &input[start..end] +} + +#[test] +fn trim_ascii_whitespace_test() { + fn test(i: &str, o: &str) { + assert_eq!(trim_ascii_whitespace(i), o) + } + + test("", ""); + test(" ", ""); + test(" a b c ", "a b c"); + test(" \t \t \ta b c \t \t \t \t", "a b c"); +} |