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Diffstat (limited to 'resources/jquery/jquery.byteLength.js')
| -rw-r--r-- | resources/jquery/jquery.byteLength.js | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/resources/jquery/jquery.byteLength.js b/resources/jquery/jquery.byteLength.js index 3d5b7206..398937e6 100644 --- a/resources/jquery/jquery.byteLength.js +++ b/resources/jquery/jquery.byteLength.js @@ -4,6 +4,8 @@ * Calculate the byte length of a string (accounting for UTF-8). * * @author Jan Paul Posma, 2011 + * @author Timo Tijhof, 2012 + * @author David Chan, 2013 */ jQuery.byteLength = function ( str ) { @@ -12,8 +14,18 @@ jQuery.byteLength = function ( str ) { // Note, surrogate (\uD800-\uDFFF) characters are counted as 2 bytes, since there's two of them // and the actual character takes 4 bytes in UTF-8 (2*2=4). Might not work perfectly in // edge cases such as illegal sequences, but that should never happen. + + // https://en.wikipedia.org/wiki/UTF-8#Description + // The mapping from UTF-16 code units to UTF-8 bytes is as follows: + // > Range 0000-007F: codepoints that become 1 byte of UTF-8 + // > Range 0080-07FF: codepoints that become 2 bytes of UTF-8 + // > Range 0800-D7FF: codepoints that become 3 bytes of UTF-8 + // > Range D800-DFFF: Surrogates (each pair becomes 4 bytes of UTF-8) + // > Range E000-FFFF: codepoints that become 3 bytes of UTF-8 (continued) + return str .replace( /[\u0080-\u07FF\uD800-\uDFFF]/g, '**' ) .replace( /[\u0800-\uD7FF\uE000-\uFFFF]/g, '***' ) .length; + }; |