penguin/AstroJS

botanjs/src/System/Encoding/Utf8.js

raw · 889 bytes

(function(){
	var ns = __namespace( "System.Encoding.Utf8" );

	// From Google closure
	var Encode = function(str)
	{
		var out = [], p = 0;
		for (var i = 0; i < str.length; i++) {
			var c = str.charCodeAt(i);
			if (c < 128) {
				out[p++] = c;
			} else if (c < 2048) {
				out[p++] = (c >> 6) | 192;
				out[p++] = (c & 63) | 128;
			} else if (
				((c & 0xFC00) == 0xD800) && (i + 1) < str.length &&
				((str.charCodeAt(i + 1) & 0xFC00) == 0xDC00)) {
				// Surrogate Pair
				c = 0x10000 + ((c & 0x03FF) << 10) + (str.charCodeAt(++i) & 0x03FF);
				out[p++] = (c >> 18) | 240;
				out[p++] = ((c >> 12) & 63) | 128;
				out[p++] = ((c >> 6) & 63) | 128;
				out[p++] = (c & 63) | 128;
			} else {
				out[p++] = (c >> 12) | 224;
				out[p++] = ((c >> 6) & 63) | 128;
				out[p++] = (c & 63) | 128;
			}
		}
		return out;
	};

	ns[ NS_EXPORT ]( EX_FUNC, "Encode", Encode );

})();