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#[inline]
pub fn escape_html(input: &str) -> String {
let mut output = String::with_capacity(input.len() * 2);
for c in input.chars() {
match c {
'&' => output.push_str("&"),
'<' => output.push_str("<"),
'>' => output.push_str(">"),
'"' => output.push_str("""),
'\'' => output.push_str("'"),
'/' => output.push_str("/"),
_ => output.push(c),
}
}
output
}
#[cfg(test)]
mod tests {
use super::escape_html;
#[test]
fn test_escape_html() {
let tests = vec![
(r"", ""),
(r"a&b", "a&b"),
(r"<a", "<a"),
(r">a", ">a"),
(r#"""#, """),
(r#"'"#, "'"),
(r#"大阪"#, "大阪"),
];
for (input, expected) in tests {
assert_eq!(escape_html(input), expected);
}
let empty = String::new();
assert_eq!(escape_html(&empty), empty);
}
}