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![Robin Munn](/assets/img/avatar_default.png)
Most astral-plane text is emojis like U+1F4DA BOOKS (📚), but some
languages like Osage have their alphabet entirely in the supplementary
multilingual plane as well. For proper support of languages like Osage,
and newer emojis, the UTF-8 decode and encode functions need to properly
handle codepoints above U+FFFF, which are represented by a surrogate
pair in Javascript strings.
142 lines
6.0 KiB
JavaScript
142 lines
6.0 KiB
JavaScript
// From https://gist.github.com/Nijikokun/5192472
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//
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// UTF8 Module
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//
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// Cleaner and modularized utf-8 encoding and decoding library for javascript.
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//
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// copyright: MIT
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// author: Nijiko Yonskai, @nijikokun, nijikokun@gmail.com
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(function (name, definition, context, dependencies) {
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if (typeof context['module'] !== 'undefined' && context['module']['exports']) { if (dependencies && context['require']) { for (var i = 0; i < dependencies.length; i++) context[dependencies[i]] = context['require'](dependencies[i]); } context['module']['exports'] = definition.apply(context); }
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else if (typeof context['define'] !== 'undefined' && context['define'] === 'function' && context['define']['amd']) { define(name, (dependencies || []), definition); }
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else { context[name] = definition.apply(context); }
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})('utf8', function () {
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return {
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encode: function (string) {
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if (typeof string !== 'string') return string;
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else string = string.replace(/\r\n/g, "\n");
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var output = "", i = 0, charCode;
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for (i; i < string.length; i++) {
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charCode = string.charCodeAt(i);
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if (charCode < 128) {
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output += String.fromCharCode(charCode);
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} else if ((charCode > 127) && (charCode < 2048)) {
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output += String.fromCharCode((charCode >> 6) | 192);
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output += String.fromCharCode((charCode & 63) | 128);
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} else if ((charCode > 55295) && (charCode < 57344) && string.length > i+1) {
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// Surrogate pair
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var hiSurrogate = charCode;
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var loSurrogate = string.charCodeAt(i+1);
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i++; // Skip the low surrogate on the next loop pass
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var codePoint = (((hiSurrogate - 55296) << 10) | (loSurrogate - 56320)) + 65536;
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output += String.fromCharCode((codePoint >> 18) | 240);
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output += String.fromCharCode(((codePoint >> 12) & 63) | 128);
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output += String.fromCharCode(((codePoint >> 6) & 63) | 128);
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output += String.fromCharCode((codePoint & 63) | 128);
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} else {
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// Not a surrogate pair, or a dangling surrogate without its partner that we'll just encode as-is
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output += String.fromCharCode((charCode >> 12) | 224);
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output += String.fromCharCode(((charCode >> 6) & 63) | 128);
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output += String.fromCharCode((charCode & 63) | 128);
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}
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}
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return output;
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},
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decode: function (string) {
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if (typeof string !== 'string') return string;
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var output = "", i = 0, charCode = 0;
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while (i < string.length) {
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charCode = string.charCodeAt(i);
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if (charCode < 128) {
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output += String.fromCharCode(charCode),
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i++;
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} else if ((charCode > 191) && (charCode < 224)) {
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output += String.fromCharCode(((charCode & 31) << 6) | (string.charCodeAt(i + 1) & 63));
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i += 2;
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} else if ((charCode > 223) && (charCode < 240)) {
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output += String.fromCharCode(((charCode & 15) << 12) | ((string.charCodeAt(i + 1) & 63) << 6) | (string.charCodeAt(i + 2) & 63));
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i += 3;
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} else {
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var codePoint = ((charCode & 7) << 18) | ((string.charCodeAt(i + 1) & 63) << 12) | ((string.charCodeAt(i + 2) & 63) << 6) | (string.charCodeAt(i + 3) & 63);
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// output += String.fromCodePoint(codePoint); // Can't do this because Internet Explorer doesn't have String.fromCodePoint
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output += String.fromCharCode(((codePoint - 65536) >> 10) + 55296) + String.fromCharCode(((codePoint - 65536) & 1023) + 56320); // So we do this instead
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i += 4;
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}
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}
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return output;
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}
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};
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}, this);
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// Base64 Module
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//
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// Cleaner, modularized and properly scoped base64 encoding and decoding module for strings.
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//
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// copyright: MIT
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// author: Nijiko Yonskai, @nijikokun, nijikokun@gmail.com
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(function (name, definition, context, dependencies) {
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if (typeof context['module'] !== 'undefined' && context['module']['exports']) { if (dependencies && context['require']) { for (var i = 0; i < dependencies.length; i++) context[dependencies[i]] = context['require'](dependencies[i]); } context['module']['exports'] = definition.apply(context); }
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else if (typeof context['define'] !== 'undefined' && context['define'] === 'function' && context['define']['amd']) { define(name, (dependencies || []), definition); }
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else { context[name] = definition.apply(context); }
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})('base64', function (utf8) {
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var $this = this;
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var $utf8 = utf8 || this.utf8;
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var map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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return {
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encode: function (input) {
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if (typeof $utf8 === 'undefined') throw { error: "MissingMethod", message: "UTF8 Module is missing." };
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if (typeof input !== 'string') return input;
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else input = $utf8.encode(input);
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var output = "", a, b, c, d, e, f, g, i = 0;
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while (i < input.length) {
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a = input.charCodeAt(i++);
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b = input.charCodeAt(i++);
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c = input.charCodeAt(i++);
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d = a >> 2;
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e = ((a & 3) << 4) | (b >> 4);
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f = ((b & 15) << 2) | (c >> 6);
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g = c & 63;
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if (isNaN(b)) f = g = 64;
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else if (isNaN(c)) g = 64;
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output += map.charAt(d) + map.charAt(e) + map.charAt(f) + map.charAt(g);
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}
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return output;
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},
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decode: function (input) {
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if (typeof $utf8 === 'undefined') throw { error: "MissingMethod", message: "UTF8 Module is missing." };
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if (typeof input !== 'string') return input;
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else input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
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var output = "", a, b, c, d, e, f, g, i = 0;
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while (i < input.length) {
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d = map.indexOf(input.charAt(i++));
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e = map.indexOf(input.charAt(i++));
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f = map.indexOf(input.charAt(i++));
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g = map.indexOf(input.charAt(i++));
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a = (d << 2) | (e >> 4);
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b = ((e & 15) << 4) | (f >> 2);
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c = ((f & 3) << 6) | g;
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output += String.fromCharCode(a);
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if (f != 64) output += String.fromCharCode(b);
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if (g != 64) output += String.fromCharCode(c);
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}
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return $utf8.decode(output);
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}
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}
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}, this, [ "utf8" ]); |