36 lines
1.2 KiB
JavaScript
36 lines
1.2 KiB
JavaScript
'use strict';
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/**
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* Is this string all whitespace?
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* This solution kind of makes my brain hurt, but it's significantly faster
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* than !str.trim() or any other solution I could find.
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*
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* whitespace codes from: http://en.wikipedia.org/wiki/Whitespace_character
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* and verified with:
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*
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* for(var i = 0; i < 65536; i++) {
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* var s = String.fromCharCode(i);
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* if(+s===0 && !s.trim()) console.log(i, s);
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* }
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*
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* which counts a couple of these as *not* whitespace, but finds nothing else
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* that *is* whitespace. Note that charCodeAt stops at 16 bits, but it appears
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* that there are no whitespace characters above this, and code points above
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* this do not map onto white space characters.
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*/
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module.exports = function(str){
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var l = str.length,
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a;
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for(var i = 0; i < l; i++) {
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a = str.charCodeAt(i);
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if((a < 9 || a > 13) && (a !== 32) && (a !== 133) && (a !== 160) &&
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(a !== 5760) && (a !== 6158) && (a < 8192 || a > 8205) &&
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(a !== 8232) && (a !== 8233) && (a !== 8239) && (a !== 8287) &&
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(a !== 8288) && (a !== 12288) && (a !== 65279)) {
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return false;
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}
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}
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return true;
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}
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