libs/pdfname.js

  1. /**
  2.  * Convert string to `PDF Name Object`.
  3.  * Detail: PDF Reference 1.3 - Chapter 3.2.4 Name Object
  4.  * @param str
  5.  */
  6. function toPDFName(str) {
  7.   // eslint-disable-next-line no-control-regex
  8.   if (/[^\u0000-\u00ff]/.test(str)) {
  9.     // non ascii string
  10.     throw new Error(
  11.       "Invalid PDF Name Object: " + str + ", Only accept ASCII characters."
  12.     );
  13.   }
  14.   var result = "",
  15.     strLength = str.length;
  16.   for (var i = 0; i < strLength; i++) {
  17.     var charCode = str.charCodeAt(i);
  18.     if (
  19.       charCode < 0x21 ||
  20.       charCode === 0x23 /* # */ ||
  21.       charCode === 0x25 /* % */ ||
  22.       charCode === 0x28 /* ( */ ||
  23.       charCode === 0x29 /* ) */ ||
  24.       charCode === 0x2f /* / */ ||
  25.       charCode === 0x3c /* < */ ||
  26.       charCode === 0x3e /* > */ ||
  27.       charCode === 0x5b /* [ */ ||
  28.       charCode === 0x5d /* ] */ ||
  29.       charCode === 0x7b /* { */ ||
  30.       charCode === 0x7d /* } */ ||
  31.       charCode > 0x7e
  32.     ) {
  33.       // Char    CharCode    hexStr   paddingHexStr    Result
  34.       // "\t"    9           9        09               #09
  35.       // " "     32          20       20               #20
  36.       // "©"     169         a9       a9               #a9
  37.       var hexStr = charCode.toString(16),
  38.         paddingHexStr = ("0" + hexStr).slice(-2);
  40.       result += "#" + paddingHexStr;
  41.     } else {
  42.       // Other ASCII printable characters between 0x21 <= X <= 0x7e
  43.       result += str[i];
  44.     }
  45.   }
  46.   return result;
  47. }
  49. export { toPDFName };