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function decodeHex(hexStr: string): string {
if (hexStr.trim() === '') {
throw new Error("can't decode empty hex")
}
const num = parseInt(hexStr, 16)
if (isNaN(num)) {
throw new Error(`invalid hex: \`${hexStr}\``)
}
return String.fromCodePoint(num)
}
const enum Mode {
Text,
Underscore,
Hex,
LongHex,
}
const DECODE_REGEX = /^__TURBOPACK__([a-zA-Z0-9_$]+)__$/
export function decodeMagicIdentifier(identifier: string): string {
const matches = identifier.match(DECODE_REGEX)
if (!matches) {
return identifier
}
const inner = matches[1]
let output = ''
let mode: Mode = Mode.Text
let buffer = ''
for (let i = 0; i < inner.length; i++) {
const char = inner[i]
if (mode === Mode.Text) {
if (char === '_') {
mode = Mode.Underscore
} else if (char === '$') {
mode = Mode.Hex
} else {
output += char
}
} else if (mode === Mode.Underscore) {
if (char === '_') {
output += ' '
mode = Mode.Text
} else if (char === '$') {
output += '_'
mode = Mode.Hex
} else {
output += char
mode = Mode.Text
}
} else if (mode === Mode.Hex) {
if (buffer.length === 2) {
output += decodeHex(buffer)
buffer = ''
}
if (char === '_') {
if (buffer !== '') {
throw new Error(`invalid hex: \`${buffer}\``)
}
mode = Mode.LongHex
} else if (char === '$') {
if (buffer !== '') {
throw new Error(`invalid hex: \`${buffer}\``)
}
mode = Mode.Text
} else {
buffer += char
}
} else if (mode === Mode.LongHex) {
if (char === '_') {
throw new Error(`invalid hex: \`${buffer + char}\``)
} else if (char === '$') {
output += decodeHex(buffer)
buffer = ''
mode = Mode.Text
} else {
buffer += char
}
}
}
return output
}
export const MAGIC_IDENTIFIER_REGEX = /__TURBOPACK__[a-zA-Z0-9_$]+__/g
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