95 lines
2.5 KiB
JavaScript
95 lines
2.5 KiB
JavaScript
// @license magnet:?xt=urn:btih:0b31508aeb0634b347b8270c7bee4d411b5d4109&dn=agpl-3.0.txt AGPL-v3-or-Later
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(function() {
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app.helpers.txtDirection = {
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setCssFor: function(str, on_element) {
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if( this.isRTL(str) ) {
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$(on_element).css('direction', 'rtl');
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} else {
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$(on_element).css('direction', 'ltr');
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}
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},
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classFor: function(str) {
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if( this.isRTL(str) ) return 'rtl';
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return 'ltr';
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},
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isRTL: function(str) {
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if(typeof str !== "string" || str.length < 1) {
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return false;
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}
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var charCode = this._fixedCharCodeAt(str, 0);
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if(charCode >= 1536 && charCode <= 1791) // Sarabic, Persian, ...
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return true;
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else if(charCode >= 65136 && charCode <= 65279) // Arabic present 1
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return true;
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else if(charCode >= 64336 && charCode <= 65023) // Arabic present 2
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return true;
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else if(charCode>=1424 && charCode<=1535) // Hebrew
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return true;
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else if(charCode>=64256 && charCode<=64335) // Hebrew present
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return true;
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else if(charCode>=68096 && charCode<=68184) // Kharoshthi
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return true;
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else if(charCode>=67840 && charCode<=67871) // Phoenician
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return true;
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else if(charCode>=1792 && charCode<=1871) // Syriac
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return true;
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else if(charCode>=1920 && charCode<=1983) // Thaana
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return true;
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else if(charCode>=1984 && charCode<=2047) // NKo
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return true;
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else if(charCode>=11568 && charCode<=11647) // Tifinagh
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return true;
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return false;
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},
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// source: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/charCodeAt
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_fixedCharCodeAt: function(str, idx) {
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str += '';
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var code,
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end = str.length;
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var surrogatePairs = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
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while ((surrogatePairs.exec(str)) != null) {
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var li = surrogatePairs.lastIndex;
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if (li - 2 < idx) {
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idx++;
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}
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else {
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break;
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}
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}
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if (idx >= end || idx < 0) {
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return NaN;
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}
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code = str.charCodeAt(idx);
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var hi, low;
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if (0xD800 <= code && code <= 0xDBFF) {
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hi = code;
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low = str.charCodeAt(idx+1);
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// Go one further, since one of the "characters" is part of a surrogate pair
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return ((hi - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000;
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}
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return code;
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}
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};
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})();
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// @license-end
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