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use std::fmt;
fn escapable(b: &u8) -> bool {
*b == b'<' || *b == b'>' || *b == b'&'
}
pub fn escape(s: &fmt::Display) -> String {
let s = format!("{}", s);
let mut found = Vec::new();
for (i, b) in s.as_bytes().iter().enumerate() {
if escapable(b) {
found.push(i);
}
}
if found.is_empty() {
return s;
}
let bytes = s.as_bytes();
let max_len = bytes.len() + found.len() * 3;
let mut res = Vec::<u8>::with_capacity(max_len);
let mut start = 0;
for idx in &found {
if start < *idx {
res.extend(&bytes[start..*idx]);
}
start = *idx + 1;
match bytes[*idx] {
b'<' => { res.extend(b"<"); },
b'>' => { res.extend(b">"); },
b'&' => { res.extend(b"&"); },
_ => panic!("incorrect indexing"),
}
}
if start < bytes.len() - 1 {
res.extend(&bytes[start..]);
}
String::from_utf8(res).unwrap()
}
pub fn e(s: &fmt::Display) -> String {
escape(s)
}
pub fn format() { }
pub fn lower(s: &fmt::Display) -> String {
let s = format!("{}", s);
s.to_lowercase()
}
pub fn lowercase(s: &fmt::Display) -> String {
lower(s)
}
pub fn upper(s: &fmt::Display) -> String {
let s = format!("{}", s);
s.to_uppercase()
}
pub fn uppercase(s: &fmt::Display) -> String {
upper(s)
}
pub fn trim(s: &fmt::Display) -> String {
let s = format!("{}", s);
s.trim().to_owned()
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_escape() {
assert_eq!(escape(&""), "");
assert_eq!(escape(&"<&>"), "<&>");
assert_eq!(escape(&"bla&"), "bla&");
assert_eq!(escape(&"<foo"), "<foo");
}
#[test]
fn test_lower() {
assert_eq!(lower(&"Foo"), "foo");
assert_eq!(lower(&"FOO"), "foo");
assert_eq!(lower(&"FooBar"), "foobar");
assert_eq!(lower(&"foo"), "foo");
}
#[test]
fn test_upper() {
assert_eq!(upper(&"Foo"), "FOO");
assert_eq!(upper(&"FOO"), "FOO");
assert_eq!(upper(&"FooBar"), "FOOBAR");
assert_eq!(upper(&"foo"), "FOO");
}
#[test]
fn test_trim() {
assert_eq!(trim(&" Hello\tworld\t"), "Hello\tworld");
}
}