20 lines
730 B
JavaScript
20 lines
730 B
JavaScript
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/**
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* jQuery.byteLength
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*
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* Calculate the byte length of a string (accounting for UTF-8).
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*
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* @author Jan Paul Posma
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*/
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jQuery.byteLength = function( str ) {
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// This basically figures out how many bytes a UTF-16 string (which is what js sees)
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// will take in UTF-8 by replacing a 2 byte character with 2 *'s, etc, and counting that.
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// Note, surrogate (\uD800-\uDFFF) characters are counted as 2 bytes, since there's two of them
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// and the actual character takes 4 bytes in UTF-8 (2*2=4). Might not work perfectly in
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// edge cases such as illegal sequences, but that should never happen.
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return str
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.replace( /[\u0080-\u07FF\uD800-\uDFFF]/g, '**' )
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.replace( /[\u0800-\uD7FF\uE000-\uFFFF]/g, '***' )
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.length;
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}
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