twitst4tz

index.js (5123B)

---

 "use strict";
 
 // Some environments don't have global Buffer (e.g. React Native).
 // Solution would be installing npm modules "buffer" and "stream" explicitly.
 var Buffer = require("safer-buffer").Buffer;
 
 var bomHandling = require("./bom-handling"),
     iconv = module.exports;
 
 // All codecs and aliases are kept here, keyed by encoding name/alias.
 // They are lazy loaded in `iconv.getCodec` from `encodings/index.js`.
 iconv.encodings = null;
 
 // Characters emitted in case of error.
 iconv.defaultCharUnicode = '�';
 iconv.defaultCharSingleByte = '?';
 
 // Public API.
 iconv.encode = function encode(str, encoding, options) {
     str = "" + (str || ""); // Ensure string.
 
     var encoder = iconv.getEncoder(encoding, options);
 
     var res = encoder.write(str);
     var trail = encoder.end();
     
     return (trail && trail.length > 0) ? Buffer.concat([res, trail]) : res;
 }
 
 iconv.decode = function decode(buf, encoding, options) {
     if (typeof buf === 'string') {
         if (!iconv.skipDecodeWarning) {
             console.error('Iconv-lite warning: decode()-ing strings is deprecated. Refer to https://github.com/ashtuchkin/iconv-lite/wiki/Use-Buffers-when-decoding');
             iconv.skipDecodeWarning = true;
         }
 
         buf = Buffer.from("" + (buf || ""), "binary"); // Ensure buffer.
     }
 
     var decoder = iconv.getDecoder(encoding, options);
 
     var res = decoder.write(buf);
     var trail = decoder.end();
 
     return trail ? (res + trail) : res;
 }
 
 iconv.encodingExists = function encodingExists(enc) {
     try {
         iconv.getCodec(enc);
         return true;
     } catch (e) {
         return false;
     }
 }
 
 // Legacy aliases to convert functions
 iconv.toEncoding = iconv.encode;
 iconv.fromEncoding = iconv.decode;
 
 // Search for a codec in iconv.encodings. Cache codec data in iconv._codecDataCache.
 iconv._codecDataCache = {};
 iconv.getCodec = function getCodec(encoding) {
     if (!iconv.encodings)
         iconv.encodings = require("../encodings"); // Lazy load all encoding definitions.
     
     // Canonicalize encoding name: strip all non-alphanumeric chars and appended year.
     var enc = iconv._canonicalizeEncoding(encoding);
 
     // Traverse iconv.encodings to find actual codec.
     var codecOptions = {};
     while (true) {
         var codec = iconv._codecDataCache[enc];
         if (codec)
             return codec;
 
         var codecDef = iconv.encodings[enc];
 
         switch (typeof codecDef) {
             case "string": // Direct alias to other encoding.
                 enc = codecDef;
                 break;
 
             case "object": // Alias with options. Can be layered.
                 for (var key in codecDef)
                     codecOptions[key] = codecDef[key];
 
                 if (!codecOptions.encodingName)
                     codecOptions.encodingName = enc;
                 
                 enc = codecDef.type;
                 break;
 
             case "function": // Codec itself.
                 if (!codecOptions.encodingName)
                     codecOptions.encodingName = enc;
 
                 // The codec function must load all tables and return object with .encoder and .decoder methods.
                 // It'll be called only once (for each different options object).
                 codec = new codecDef(codecOptions, iconv);
 
                 iconv._codecDataCache[codecOptions.encodingName] = codec; // Save it to be reused later.
                 return codec;
 
             default:
                 throw new Error("Encoding not recognized: '" + encoding + "' (searched as: '"+enc+"')");
         }
     }
 }
 
 iconv._canonicalizeEncoding = function(encoding) {
     // Canonicalize encoding name: strip all non-alphanumeric chars and appended year.
     return (''+encoding).toLowerCase().replace(/:\d{4}$|[^0-9a-z]/g, "");
 }
 
 iconv.getEncoder = function getEncoder(encoding, options) {
     var codec = iconv.getCodec(encoding),
         encoder = new codec.encoder(options, codec);
 
     if (codec.bomAware && options && options.addBOM)
         encoder = new bomHandling.PrependBOM(encoder, options);
 
     return encoder;
 }
 
 iconv.getDecoder = function getDecoder(encoding, options) {
     var codec = iconv.getCodec(encoding),
         decoder = new codec.decoder(options, codec);
 
     if (codec.bomAware && !(options && options.stripBOM === false))
         decoder = new bomHandling.StripBOM(decoder, options);
 
     return decoder;
 }
 
 
 // Load extensions in Node. All of them are omitted in Browserify build via 'browser' field in package.json.
 var nodeVer = typeof process !== 'undefined' && process.versions && process.versions.node;
 if (nodeVer) {
 
     // Load streaming support in Node v0.10+
     var nodeVerArr = nodeVer.split(".").map(Number);
     if (nodeVerArr[0] > 0 || nodeVerArr[1] >= 10) {
         require("./streams")(iconv);
     }
 
     // Load Node primitive extensions.
     require("./extend-node")(iconv);
 }
 
 if ("Ā" != "\u0100") {
     console.error("iconv-lite warning: javascript files use encoding different from utf-8. See https://github.com/ashtuchkin/iconv-lite/wiki/Javascript-source-file-encodings for more info.");
 }