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// CSS escapes
// https://www.w3.org/TR/CSS21/syndata.html#escaped-characters
import { whitespace } from "../var/whitespace.js";
var runescape = new RegExp( "\\\\[\\da-fA-F]{1,6}" + whitespace +
"?|\\\\([^\\r\\n\\f])", "g" ),
funescape = function( escape, nonHex ) {
var high = "0x" + escape.slice( 1 ) - 0x10000;
if ( nonHex ) {
// Strip the backslash prefix from a non-hex escape sequence
return nonHex;
}
// Replace a hexadecimal escape sequence with the encoded Unicode code point
// Support: IE <=11+
// For values outside the Basic Multilingual Plane (BMP), manually construct a
// surrogate pair
return high < 0 ?
String.fromCharCode( high + 0x10000 ) :
String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
};
export function unescapeSelector( sel ) {
return sel.replace( runescape, funescape );
}
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