in ext/syntaxhighlighter/scripts/XRegExp.js [334:418]
String.prototype.replace = function (search, replacement) {
var isRegex = XRegExp.isRegExp(search),
captureNames, result, str;
// There are many combinations of search/replacement types/values and browser bugs that
// preclude passing to native `replace`, so just keep this check relatively simple
if (isRegex && typeof replacement.valueOf() === "string" && replacement.indexOf("${") === -1 && compliantLastIndexReset)
return real.replace.apply(this, arguments);
if (!isRegex)
search = search + ""; // Type conversion
else if (search._xregexp)
captureNames = search._xregexp.captureNames; // Array or `null`
if (typeof replacement === "function") {
result = real.replace.call(this, search, function () {
if (captureNames) {
// Change the `arguments[0]` string primitive to a String object which can store properties
arguments[0] = new String(arguments[0]);
// Store named backreferences on `arguments[0]`
for (var i = 0; i < captureNames.length; i++) {
if (captureNames[i])
arguments[0][captureNames[i]] = arguments[i + 1];
}
}
// Update `lastIndex` before calling `replacement`
if (isRegex && search.global)
search.lastIndex = arguments[arguments.length - 2] + arguments[0].length;
return replacement.apply(null, arguments);
});
} else {
str = this + ""; // Type conversion, so `args[args.length - 1]` will be a string (given nonstring `this`)
result = real.replace.call(str, search, function () {
var args = arguments; // Keep this function's `arguments` available through closure
return real.replace.call(replacement, replacementToken, function ($0, $1, $2) {
// Numbered backreference (without delimiters) or special variable
if ($1) {
switch ($1) {
case "$": return "$";
case "&": return args[0];
case "`": return args[args.length - 1].slice(0, args[args.length - 2]);
case "'": return args[args.length - 1].slice(args[args.length - 2] + args[0].length);
// Numbered backreference
default:
// What does "$10" mean?
// - Backreference 10, if 10 or more capturing groups exist
// - Backreference 1 followed by "0", if 1-9 capturing groups exist
// - Otherwise, it's the string "$10"
// Also note:
// - Backreferences cannot be more than two digits (enforced by `replacementToken`)
// - "$01" is equivalent to "$1" if a capturing group exists, otherwise it's the string "$01"
// - There is no "$0" token ("$&" is the entire match)
var literalNumbers = "";
$1 = +$1; // Type conversion; drop leading zero
if (!$1) // `$1` was "0" or "00"
return $0;
while ($1 > args.length - 3) {
literalNumbers = String.prototype.slice.call($1, -1) + literalNumbers;
$1 = Math.floor($1 / 10); // Drop the last digit
}
return ($1 ? args[$1] || "" : "$") + literalNumbers;
}
// Named backreference or delimited numbered backreference
} else {
// What does "${n}" mean?
// - Backreference to numbered capture n. Two differences from "$n":
// - n can be more than two digits
// - Backreference 0 is allowed, and is the entire match
// - Backreference to named capture n, if it exists and is not a number overridden by numbered capture
// - Otherwise, it's the string "${n}"
var n = +$2; // Type conversion; drop leading zeros
if (n <= args.length - 3)
return args[n];
n = captureNames ? indexOf(captureNames, $2) : -1;
return n > -1 ? args[n + 1] : $0;
}
});
});
}
if (isRegex && search.global)
search.lastIndex = 0; // Fix IE bug
return result;
};