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use std::{
borrow::Cow,
fmt::{Display, Write},
};
use once_cell::sync::Lazy;
use regex::{Captures, Regex, Replacer};
pub fn mangle(content: &str) -> String {
let mut r = "__TURBOPACK__".to_string();
let mut hex_mode = false;
for c in content.chars() {
if matches!(c, '0'..='9' | 'A'..='Z' | 'a'..='z' | ' ') {
if hex_mode {
r.push('$');
hex_mode = false;
}
if c == ' ' {
r += "__";
} else {
r.push(c);
}
} else if c == '_' && (!r.ends_with('_') || hex_mode) {
if hex_mode {
r.push('$');
hex_mode = false;
}
r += "_";
} else if c == '$' && !hex_mode {
r += "$$";
} else if matches!(c, '\0'..='\u{ff}') {
if !hex_mode {
r.push('$');
hex_mode = true;
}
write!(r, "{0:2x}", c as u8).unwrap();
} else {
if !hex_mode {
r.push('$');
}
write!(r, "_{:x}$", c as u32).unwrap();
hex_mode = false;
}
}
if hex_mode {
r.push('$');
}
r += "__";
r
}
/// Decodes a magic identifier into a string.
pub fn unmangle(identifier: &str) -> String {
static DECODE_REGEX: Lazy<Regex> =
Lazy::new(|| Regex::new(r"^__TURBOPACK__([a-zA-Z0-9_$]+)__$").unwrap());
let Some(captures) = DECODE_REGEX.captures(identifier) else {
return identifier.to_string();
};
let content = captures.get(1).unwrap().as_str();
enum Mode {
Text,
Underscore,
Hex,
LongHex,
}
let mut mode = Mode::Text;
let mut output = String::new();
let mut buffer = String::with_capacity(2);
for char in content.chars() {
match mode {
Mode::Text => match char {
'_' => mode = Mode::Underscore,
'$' => mode = Mode::Hex,
c => output.push(c),
},
Mode::Underscore => match char {
'_' => {
output.push(' ');
mode = Mode::Text;
}
'$' => {
output.push('_');
mode = Mode::Hex;
}
c => {
output.push('_');
output.push(c);
mode = Mode::Text;
}
},
Mode::Hex => {
if buffer.len() == 2 {
if let Ok(byte) = u8::from_str_radix(&buffer, 16) {
output.push(byte as char);
}
buffer.clear();
}
match char {
'_' => {
debug_assert!(buffer.is_empty());
mode = Mode::LongHex;
}
'$' => {
debug_assert!(buffer.is_empty());
mode = Mode::Text;
}
c => {
buffer.push(c);
}
}
}
Mode::LongHex => {
debug_assert!(char != '_');
match char {
'$' => {
if let Ok(code) = u32::from_str_radix(&buffer, 16) {
output.push(std::char::from_u32(code).unwrap());
}
buffer.clear();
mode = Mode::Text;
}
c => {
buffer.push(c);
}
}
}
}
}
debug_assert!(matches!(mode, Mode::Text));
output
}
/// Decode all magic identifiers in a string.
pub fn unmangle_identifiers<T: Display>(text: &str, magic: impl Fn(String) -> T) -> Cow<'_, str> {
static IDENTIFIER_REGEX: Lazy<Regex> =
Lazy::new(|| Regex::new(r"__TURBOPACK__[a-zA-Z0-9_$]+__").unwrap());
struct Rep<T: Fn(String) -> O, O: Display>(T);
impl<T: Fn(String) -> O, O: Display> Replacer for Rep<T, O> {
fn replace_append(&mut self, caps: &Captures<'_>, dst: &mut String) {
write!(dst, "{}", self.0(unmangle(caps.get(0).unwrap().as_str()))).unwrap();
}
}
IDENTIFIER_REGEX.replace_all(text, Rep(magic))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_encode() {
assert_eq!(mangle("Hello World"), "__TURBOPACK__Hello__World__");
assert_eq!(mangle("Hello_World"), "__TURBOPACK__Hello_World__");
assert_eq!(mangle("Hello__World"), "__TURBOPACK__Hello_$5f$World__");
assert_eq!(mangle("Hello___World"), "__TURBOPACK__Hello_$5f$_World__");
assert_eq!(mangle("Hello/World"), "__TURBOPACK__Hello$2f$World__");
assert_eq!(mangle("Hello///World"), "__TURBOPACK__Hello$2f2f2f$World__");
assert_eq!(mangle("Hello/_World"), "__TURBOPACK__Hello$2f$_World__");
assert_eq!(mangle("Hello_/_World"), "__TURBOPACK__Hello_$2f$_World__");
assert_eq!(mangle("Hello😀World"), "__TURBOPACK__Hello$_1f600$World__");
assert_eq!(
mangle("Hello/😀/World"),
"__TURBOPACK__Hello$2f_1f600$$2f$World__"
);
assert_eq!(
mangle("Hello😀😀World"),
"__TURBOPACK__Hello$_1f600$$_1f600$World__"
);
}
#[test]
fn test_decode() {
assert_eq!(unmangle("__TURBOPACK__Hello__World__"), "Hello World");
assert_eq!(unmangle("__TURBOPACK__Hello_World__"), "Hello_World");
assert_eq!(unmangle("__TURBOPACK__Hello_$5f$World__"), "Hello__World");
assert_eq!(unmangle("__TURBOPACK__Hello_$5f$_World__"), "Hello___World");
assert_eq!(unmangle("__TURBOPACK__Hello$2f$World__"), "Hello/World");
assert_eq!(
unmangle("__TURBOPACK__Hello$2f2f2f$World__"),
"Hello///World"
);
assert_eq!(unmangle("__TURBOPACK__Hello$2f$_World__"), "Hello/_World");
assert_eq!(unmangle("__TURBOPACK__Hello_$2f$_World__"), "Hello_/_World");
assert_eq!(
unmangle("__TURBOPACK__Hello$_1f600$World__"),
"Hello😀World"
);
assert_eq!(
unmangle("__TURBOPACK__Hello$2f_1f600$$2f$World__"),
"Hello/😀/World"
);
assert_eq!(
unmangle("__TURBOPACK__Hello$_1f600$$_1f600$World__"),
"Hello😀😀World"
);
}
#[test]
fn test_unmangle_identifiers() {
assert_eq!(
unmangle_identifiers(
"Hello __TURBOPACK__Hello__World__ __TURBOPACK__Hello_World__",
|s| format!("{{{s}}}")
),
"Hello {Hello World} {Hello_World}"
);
}
}
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