src/selector/unescapeSelector.js

   1 // CSS escapes
   2 // https://www.w3.org/TR/CSS21/syndata.html#escaped-characters
   3 import { whitespace } from "../var/whitespace.js";
   4
   5 var runescape = new RegExp( "\\\\[\\da-fA-F]{1,6}" + whitespace +
   6         "?|\\\\([^\\r\\n\\f])", "g" ),
   7         funescape = function( escape, nonHex ) {
   8                 var high = "0x" + escape.slice( 1 ) - 0x10000;
   9
  10                 if ( nonHex ) {
  11
  12                         // Strip the backslash prefix from a non-hex escape sequence
  13                         return nonHex;
  14                 }
  15
  16                 // Replace a hexadecimal escape sequence with the encoded Unicode code point
  17                 // Support: IE <=11+
  18                 // For values outside the Basic Multilingual Plane (BMP), manually construct a
  19                 // surrogate pair
  20                 return high < 0 ?
  21                         String.fromCharCode( high + 0x10000 ) :
  22                         String.fromCharCode( high >> 10 | 0xD800, high & 0x3FF | 0xDC00 );
  23         };
  24
  25 export function unescapeSelector( sel ) {
  26         return sel.replace( runescape, funescape );
  27 }