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encoding.js6.5 KB · 291 lines
1'use strict'2 3/**4 * @see https://encoding.spec.whatwg.org/#concept-encoding-get5 * @param {string|undefined} label6 */7function getEncoding (label) {8  if (!label) {9    return 'failure'10  }11 12  // 1. Remove any leading and trailing ASCII whitespace from label.13  // 2. If label is an ASCII case-insensitive match for any of the14  //    labels listed in the table below, then return the15  //    corresponding encoding; otherwise return failure.16  switch (label.trim().toLowerCase()) {17    case 'unicode-1-1-utf-8':18    case 'unicode11utf8':19    case 'unicode20utf8':20    case 'utf-8':21    case 'utf8':22    case 'x-unicode20utf8':23      return 'UTF-8'24    case '866':25    case 'cp866':26    case 'csibm866':27    case 'ibm866':28      return 'IBM866'29    case 'csisolatin2':30    case 'iso-8859-2':31    case 'iso-ir-101':32    case 'iso8859-2':33    case 'iso88592':34    case 'iso_8859-2':35    case 'iso_8859-2:1987':36    case 'l2':37    case 'latin2':38      return 'ISO-8859-2'39    case 'csisolatin3':40    case 'iso-8859-3':41    case 'iso-ir-109':42    case 'iso8859-3':43    case 'iso88593':44    case 'iso_8859-3':45    case 'iso_8859-3:1988':46    case 'l3':47    case 'latin3':48      return 'ISO-8859-3'49    case 'csisolatin4':50    case 'iso-8859-4':51    case 'iso-ir-110':52    case 'iso8859-4':53    case 'iso88594':54    case 'iso_8859-4':55    case 'iso_8859-4:1988':56    case 'l4':57    case 'latin4':58      return 'ISO-8859-4'59    case 'csisolatincyrillic':60    case 'cyrillic':61    case 'iso-8859-5':62    case 'iso-ir-144':63    case 'iso8859-5':64    case 'iso88595':65    case 'iso_8859-5':66    case 'iso_8859-5:1988':67      return 'ISO-8859-5'68    case 'arabic':69    case 'asmo-708':70    case 'csiso88596e':71    case 'csiso88596i':72    case 'csisolatinarabic':73    case 'ecma-114':74    case 'iso-8859-6':75    case 'iso-8859-6-e':76    case 'iso-8859-6-i':77    case 'iso-ir-127':78    case 'iso8859-6':79    case 'iso88596':80    case 'iso_8859-6':81    case 'iso_8859-6:1987':82      return 'ISO-8859-6'83    case 'csisolatingreek':84    case 'ecma-118':85    case 'elot_928':86    case 'greek':87    case 'greek8':88    case 'iso-8859-7':89    case 'iso-ir-126':90    case 'iso8859-7':91    case 'iso88597':92    case 'iso_8859-7':93    case 'iso_8859-7:1987':94    case 'sun_eu_greek':95      return 'ISO-8859-7'96    case 'csiso88598e':97    case 'csisolatinhebrew':98    case 'hebrew':99    case 'iso-8859-8':100    case 'iso-8859-8-e':101    case 'iso-ir-138':102    case 'iso8859-8':103    case 'iso88598':104    case 'iso_8859-8':105    case 'iso_8859-8:1988':106    case 'visual':107      return 'ISO-8859-8'108    case 'csiso88598i':109    case 'iso-8859-8-i':110    case 'logical':111      return 'ISO-8859-8-I'112    case 'csisolatin6':113    case 'iso-8859-10':114    case 'iso-ir-157':115    case 'iso8859-10':116    case 'iso885910':117    case 'l6':118    case 'latin6':119      return 'ISO-8859-10'120    case 'iso-8859-13':121    case 'iso8859-13':122    case 'iso885913':123      return 'ISO-8859-13'124    case 'iso-8859-14':125    case 'iso8859-14':126    case 'iso885914':127      return 'ISO-8859-14'128    case 'csisolatin9':129    case 'iso-8859-15':130    case 'iso8859-15':131    case 'iso885915':132    case 'iso_8859-15':133    case 'l9':134      return 'ISO-8859-15'135    case 'iso-8859-16':136      return 'ISO-8859-16'137    case 'cskoi8r':138    case 'koi':139    case 'koi8':140    case 'koi8-r':141    case 'koi8_r':142      return 'KOI8-R'143    case 'koi8-ru':144    case 'koi8-u':145      return 'KOI8-U'146    case 'csmacintosh':147    case 'mac':148    case 'macintosh':149    case 'x-mac-roman':150      return 'macintosh'151    case 'iso-8859-11':152    case 'iso8859-11':153    case 'iso885911':154    case 'tis-620':155    case 'windows-874':156      return 'windows-874'157    case 'cp1250':158    case 'windows-1250':159    case 'x-cp1250':160      return 'windows-1250'161    case 'cp1251':162    case 'windows-1251':163    case 'x-cp1251':164      return 'windows-1251'165    case 'ansi_x3.4-1968':166    case 'ascii':167    case 'cp1252':168    case 'cp819':169    case 'csisolatin1':170    case 'ibm819':171    case 'iso-8859-1':172    case 'iso-ir-100':173    case 'iso8859-1':174    case 'iso88591':175    case 'iso_8859-1':176    case 'iso_8859-1:1987':177    case 'l1':178    case 'latin1':179    case 'us-ascii':180    case 'windows-1252':181    case 'x-cp1252':182      return 'windows-1252'183    case 'cp1253':184    case 'windows-1253':185    case 'x-cp1253':186      return 'windows-1253'187    case 'cp1254':188    case 'csisolatin5':189    case 'iso-8859-9':190    case 'iso-ir-148':191    case 'iso8859-9':192    case 'iso88599':193    case 'iso_8859-9':194    case 'iso_8859-9:1989':195    case 'l5':196    case 'latin5':197    case 'windows-1254':198    case 'x-cp1254':199      return 'windows-1254'200    case 'cp1255':201    case 'windows-1255':202    case 'x-cp1255':203      return 'windows-1255'204    case 'cp1256':205    case 'windows-1256':206    case 'x-cp1256':207      return 'windows-1256'208    case 'cp1257':209    case 'windows-1257':210    case 'x-cp1257':211      return 'windows-1257'212    case 'cp1258':213    case 'windows-1258':214    case 'x-cp1258':215      return 'windows-1258'216    case 'x-mac-cyrillic':217    case 'x-mac-ukrainian':218      return 'x-mac-cyrillic'219    case 'chinese':220    case 'csgb2312':221    case 'csiso58gb231280':222    case 'gb2312':223    case 'gb_2312':224    case 'gb_2312-80':225    case 'gbk':226    case 'iso-ir-58':227    case 'x-gbk':228      return 'GBK'229    case 'gb18030':230      return 'gb18030'231    case 'big5':232    case 'big5-hkscs':233    case 'cn-big5':234    case 'csbig5':235    case 'x-x-big5':236      return 'Big5'237    case 'cseucpkdfmtjapanese':238    case 'euc-jp':239    case 'x-euc-jp':240      return 'EUC-JP'241    case 'csiso2022jp':242    case 'iso-2022-jp':243      return 'ISO-2022-JP'244    case 'csshiftjis':245    case 'ms932':246    case 'ms_kanji':247    case 'shift-jis':248    case 'shift_jis':249    case 'sjis':250    case 'windows-31j':251    case 'x-sjis':252      return 'Shift_JIS'253    case 'cseuckr':254    case 'csksc56011987':255    case 'euc-kr':256    case 'iso-ir-149':257    case 'korean':258    case 'ks_c_5601-1987':259    case 'ks_c_5601-1989':260    case 'ksc5601':261    case 'ksc_5601':262    case 'windows-949':263      return 'EUC-KR'264    case 'csiso2022kr':265    case 'hz-gb-2312':266    case 'iso-2022-cn':267    case 'iso-2022-cn-ext':268    case 'iso-2022-kr':269    case 'replacement':270      return 'replacement'271    case 'unicodefffe':272    case 'utf-16be':273      return 'UTF-16BE'274    case 'csunicode':275    case 'iso-10646-ucs-2':276    case 'ucs-2':277    case 'unicode':278    case 'unicodefeff':279    case 'utf-16':280    case 'utf-16le':281      return 'UTF-16LE'282    case 'x-user-defined':283      return 'x-user-defined'284    default: return 'failure'285  }286}287 288module.exports = {289  getEncoding290}291