The other day, an exterior API phone call that I was making stopped working since among the worths that I was publishing included a tracking “Absolutely no size room” personality ( u200b). The worth concerned was being passed-through ColdFusion’s indigenous trim() feature; which was plainly not getting rid of this whitespace personality. Because of this, it struck me that I really did not truly recognize which personalities are (and also are not) dealt with by the trim() feature. Therefore, I wished to run an examination.
Among things that I enjoy concerning Lucee CFML is that every one of the resource code is uploaded right there on GitHub. So, if I would like to know exactly how something is functioning under the hood, I can simply go take a look at it. When we take a look at Lucee’s application of the trim() feature, we can see that it is handing control off to Java’s String.trim() technique. As well as, Java’s String.trim() eliminates all ASCII personalities from u0000 approximately (and also consisting of) u0020 (the room personality).
Certainly, given that Adobe ColdFusion’s code is closed-source, we can not recognize what it is doing. We can just examine it. As well as, do this, I’m gathering every one of the “typical” whitespace personalities and also the non-standard whitespace personalities (that I determined in my text-normalization part) and also I’m knotting over them to see if they endure a phone call to trim():
<< cfscript>>.
testCharacters = [
// Standard "whitespace" charaters.
hexToChar( "0009" ), // Tab.
hexToChar( "0010" ), // Line Break.
hexToChar( "0013" ), // Carriage Return.
hexToChar( "0020" ), // Space.
// Non-stanard "whitespace" characters.
hexToChar( "00a0" ), // No-Break Space.
hexToChar( "2000" ), // En Quad (space that is one en wide).
hexToChar( "2001" ), // Em Quad (space that is one em wide).
hexToChar( "2002" ), // En Space.
hexToChar( "2003" ), // Em Space.
hexToChar( "2004" ), // Thic Space.
hexToChar( "2005" ), // Mid Space.
hexToChar( "2006" ), // Six-Per-Em Space.
hexToChar( "2007" ), // Figure Space.
hexToChar( "2008" ), // Punctuation Space.
hexToChar( "2009" ), // Thin Space.
hexToChar( "200a" ), // Hair Space.
hexToChar( "200b" ), // Zero Width Space.
hexToChar( "2028" ), // Line Separator.
hexToChar( "2029" ), // Paragraph Separator.
hexToChar( "202f" ), // Narrow No-Break Space.
hexToChar( "feff" ) // Zero Width No-Break Space.
];
// For every examination whitespace personality, allow's see if it endures a trim() phone call.
for (c in testCharacters) {
writeOutput( len( trim( c)) );.
writeOutput( "," );.
}
// -------------------------------------------------------------------------------//.
// -------------------------------------------------------------------------------//.
/ **.
* I transform the offered hex-encoded personality to an ASCII personality.
*/.
public string feature hexToChar( needed string hexEncoded) {
return( chr( inputBaseN( hexEncoded, 16)) );.
}
<.
As you can see, I begin with our 4 most typical control-characters and also areas; and afterwards, I adhere to with a selection of various other unusual whitespace personalities. When we run this code in either Lucee CFML or Adobe ColdFusion, we obtain the very same result:
0, 0, 0, 0,.
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1.
As you can see, the very first 4 examination personalities (Tab, Line-Break, Carriage Return, Area) were all eliminated by the trim() feature - which matches what Java's String.trim() feature is recorded to do. As well as, every one of the various other unusual whitespace personalities stay. Because of this, I believe it would certainly be reasonable to presume that Adobe ColdFusion's trim() feature is most likely likewise handing control off to Java's String.trim() application. Which indicates that both CFML engines just get rid of personalities u0000 approximately and also consisting of u0020 in their trim() feature executions.
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