RE: [xsl] Converting &, >, <, ", and other odd-ball characters...

["Michael Kay" <mhkay at iclway dot co dot uk>]

Well, I'd say your code is still pretty inefficient. You create a new
StringBuffer() on each call, even when it's not needed. Take a look at the
code in Saxon's XMLEmitter.

Mike Kay

> -----Original Message-----
> From: owner-xsl-list@lists.mulberrytech.com
> [mailto:owner-xsl-list@lists.mulberrytech.com]On Behalf Of
> Kevin Duffey
> Sent: 15 February 2001 16:28
> To: xsl-list@lists.mulberrytech.com
> Subject: RE: [xsl] Converting &, >, <, ", and other odd-ball
> characters...
>
>
> Thanks Mike.  I did something similar. Basically, I created a
> static final
> method like so:
>
>
>
>   private static final String[] HTMLChars   = new
ing[]{ 
> "&", "\"", "<",
> ">"};
>   private static final String[] HTMLRepl    = new String[]{"&amp;",
> "&quot;", "&lt;", "&gt;"};
> 
>   public static final String decodeHtml(String value)
>   {
>     return decode(value, HTMLChars, HTMLRepl);
>   }
> 
> 
>   public static final String decode(String value, String[] 
> chars, String[]
> repl)
>   {
>     // return null if the value, chars[], repl[] are null or 
> the number
>     // of elemetns of the chars[] and repl[] are not the same.
>     if( value == null || chars == null || repl == null || 
> chars.length !=
> repl.length )
>       return null;
> 
>     int sze = chars.length;
>     StringBuffer sb = new StringBuffer(value);
>     for( int cntr = 0; cntr < sze; cntr++ )
>     {
>       int curPos = 0;
>       int oldPos = 0;
> 
>       while( (curPos = sb.toString().indexOf(chars[cntr], 
> oldPos)) > -1 )
>       {
>         // found a match, so replace this occurrence of the string
>         // with the same element in the repl[] array
>         sb.replace(curPos, curPos + chars[cntr].length(), repl[cntr]);
>         oldPos = curPos + chars[cntr].length() + 1;
>       }
>     }
> 
>     return sb.toString();
>   }
> 
> 
> This method works, so long as the first char[] is '&'. I am 
> not sure if this
> is as fast though..so I think I am going to use yours (and 
> another person
> sent me a similar routine) I get the feeling the 
> sb.toString() call on each
> iteration is slower than just looking at every character one 
> at a time. I
> thought the sb.charAt() was slow? That is why I opted for using the
> indexOf() search, as I read that it is very effecient. I'll keep both
> routines and one day to a performance analysis of them. This 
> is definitely
> one method that needs to be all it can be, since it will be 
> needed on almost
> every page and every form.
> 
> Thanks.
> 
> > -----Original Message-----
> > From: owner-xsl-list@lists.mulberrytech.com
> > [mailto:owner-xsl-list@lists.mulberrytech.com]On Behalf Of 
> Mike Brown
> > Sent: Wednesday, February 14, 2001 10:29 PM
> > To: xsl-list@lists.mulberrytech.com
> > Subject: Re: [xsl] Converting &, >, <, ", and other odd-ball
> > characters...
> >
> >
> > Duffey, Kevin wrote:
> > > I am about to write a java routine that is called by every
> > single field of
> > > every jsp page just to convert possible ", >, < and & as well
> > as check for
> > > some other characters and strip them (such as an MS Word 
> paste that uses
> > > bullets or the " " characters that use special codes for them).
> >
> > I will infer from this that you are using your JSPs to make XML that
> > contains strings obtained from HTML form data.
> >
> > > I am not sure which way to go though. Is there a way to
> > automatically have
> > > XML and/or XSL convert these characters for me?
> >
> > No, XSLT is only able to work with XML documents that made 
> it through a
> > parser. And you'll find that string substitution in XSLT is 
> nearly as
> > painful as it is in Java.
> >
> > You must always escape the attribute values. You can get 
> around the need
> > to escape character data content of an element by using 
> CDATA sections,
> > but I think you'll find that it's actually just as easy to escape
> > everything. Entities aren't going to help you.
> >
> > Also note that you
 can put your Java method in your JSP.
> > The following code is untested, but you get the general idea.
> >
> > <%!
> >
> >     // at times like these, perl would be beautiful
> >     private String escape( String s ) {
> >         StringBuffer sb = new StringBuffer();
> >         for ( int i = 0; i < s.length(); i++ ) {
> >             switch ( s.charAt(i) ) {
> >                 case '&': sb.append("&amp;");
> >                           break;
> >                 case '<': sb.append("&lt;");
> >                           break;
> >                 case '>': sb.append("&gt;");
> >                           break;
> >                 default: sb.append( s.charAt(i) );
> >             }
> >         }
> >         return sb.toString();
> >     }
> >
> > %>
> >
> > ...
> >
> > <%
> >    String somexml = new String( "<stuff>" +
> > escape(getParameter("foo")) + "</stuff>" );
> > %>
> >
> >    - Mike
> > ____________________________________________________________________
> > Mike J. Brown, software engineer at            My XML/XSL resources:
> > webb.net in Denver, Colorado, USA              http://skew.org/xml/
> >
> >
> >  XSL-List info and archive:
http://www.mulberrytech.com/xsl/xsl-list
>
>


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