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pub fn stringify_js(str: &str) -> String {
let mut escaped = String::with_capacity(str.len());
for char in str.chars() {
match char {
// Escape the following characters required for strings by the CSS scanner:
// https://www.w3.org/TR/CSS21/grammar.html#scanner
// https://github.com/vercel/turbo/pull/2598#discussion_r1022625909
//
// Note that the form feed character is not representable as \f in Rust strings, so
// the unicode representation \u{0c} is used.
'\\' => escaped.push_str(r"\\"),
'\n' => escaped.push_str(r"\n"),
'\r' => escaped.push_str(r"\r"),
'"' => escaped.push_str(r#"\""#),
'\u{0c}' => escaped.push_str(r"\f"),
_ => escaped.push(char),
}
}
format!("\"{escaped}\"")
}
#[cfg(test)]
mod tests {
use crate::util::stringify_js;
#[test]
fn surrounds_with_double_quotes() {
assert_eq!(stringify_js("foo"), r#""foo""#);
}
#[test]
fn escapes_double_quotes() {
assert_eq!(stringify_js(r#""""#), r#""\"\"""#);
}
#[test]
fn escapes_backslash() {
assert_eq!(stringify_js(r"\"), r#""\\""#);
assert_eq!(stringify_js(r"\\"), r#""\\\\""#);
assert_eq!(stringify_js(r"\n"), r#""\\n""#);
}
#[test]
fn escapes_newlines() {
assert_eq!(stringify_js("\n"), r#""\n""#);
}
#[test]
fn escapes_mixed() {
assert_eq!(stringify_js("\n\r\u{0c}"), r#""\n\r\f""#);
}
}
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