71 lines
2.1 KiB
JavaScript
71 lines
2.1 KiB
JavaScript
function utf8_encode (argString) {
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// http://kevin.vanzonneveld.net
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// + original by: Webtoolkit.info (http://www.webtoolkit.info/)
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// + improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
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// + improved by: sowberry
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// + tweaked by: Jack
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// + bugfixed by: Onno Marsman
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// + improved by: Yves Sucaet
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// + bugfixed by: Onno Marsman
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// + bugfixed by: Ulrich
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// + bugfixed by: Rafal Kukawski
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// + improved by: kirilloid
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// + bugfixed by: kirilloid
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// * example 1: utf8_encode('Kevin van Zonneveld');
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// * returns 1: 'Kevin van Zonneveld'
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if (argString === null || typeof argString === "undefined") {
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return "";
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}
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var string = (argString + ''); // .replace(/\r\n/g, "\n").replace(/\r/g, "\n");
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var utftext = '',
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start, end, stringl = 0;
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start = end = 0;
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stringl = string.length;
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for (var n = 0; n < stringl; n++) {
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var c1 = string.charCodeAt(n);
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var enc = null;
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if (c1 < 128) {
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end++;
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} else if (c1 > 127 && c1 < 2048) {
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enc = String.fromCharCode(
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(c1 >> 6) | 192,
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( c1 & 63) | 128
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);
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} else if (c1 & 0xF800 != 0xD800) {
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enc = String.fromCharCode(
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(c1 >> 12) | 224,
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((c1 >> 6) & 63) | 128,
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( c1 & 63) | 128
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);
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} else { // surrogate pairs
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if (c1 & 0xFC00 != 0xD800) { throw new RangeError("Unmatched trail surrogate at " + n); }
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var c2 = string.charCodeAt(++n);
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if (c2 & 0xFC00 != 0xDC00) { throw new RangeError("Unmatched lead surrogate at " + (n-1)); }
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c1 = ((c1 & 0x3FF) << 10) + (c2 & 0x3FF) + 0x10000;
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enc = String.fromCharCode(
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(c1 >> 18) | 240,
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((c1 >> 12) & 63) | 128,
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((c1 >> 6) & 63) | 128,
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( c1 & 63) | 128
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);
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}
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if (enc !== null) {
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if (end > start) {
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utftext += string.slice(start, end);
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}
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utftext += enc;
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start = end = n + 1;
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}
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}
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if (end > start) {
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utftext += string.slice(start, stringl);
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}
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return utftext;
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}
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