[yunqa.de] Re: DIHtmlParser and Entities
- From: "Mike Dixon" <mike@xxxxxxxxxxx>
- To: <yunqa@xxxxxxxxxxxxx>
- Date: Thu, 9 Jul 2009 15:29:39 -0500
Thanks, I'll give that a try. © instead of © would be just fine.
> -----Original Message-----
> From: yunqa-bounce@xxxxxxxxxxxxx
> [mailto:yunqa-bounce@xxxxxxxxxxxxx] On Behalf Of Delphi Inspiration
> Sent: Thursday, July 09, 2009 2:23 PM
> To: yunqa@xxxxxxxxxxxxx
> Subject: [yunqa.de] Re: DIHtmlParser and Entities
>
> At 17:44 09.07.2009, Mike Dixon wrote:
>
> >I'm trying to use the DIHtmlParser, DIHtmlCasePlugin, and
> >DIHtmlWriterPlugin to simply convert HTML tags, attributes, etc to
> >lowercase - all of that works fine.
> >
> >My problem is that entities are being converted to their single
> >character equivalents.
>
> This is by no means a problem in HTML. According to the
> specification, charcters and entities are equivalent in HTML.
> DIHtmlParser takes care to decode entities to their correct
> character representation so they will result in the same page
> rendering when viewed with web browsers.
>
> >In other words, they're being decoded and I don't want them to be.
>
> Wanting or not wanting is another issue. To approach this, it
> helps to understand how DIHtmlParser writes out text
> characters. In TDIHtmlWriterPlugin, this is a 3-step process:
>
> 1. Try to represent the character with the current character encoding.
>
> 2. If 1. fails (because the character is not available),
> try to escape it with a registered named entity.
>
> 3. If 2. fails as well (because there is no such named entity),
> use a numeric entity instead. This will finally succeed because
> all chars can be represented through numeric entities.
>
> This algorithm was deliberately choosen because it produces
> the shortest possible output.
>
> >For example, © is converted to C.
>
> Corretly so (more precisely, it is the (c) copyright sign we
> are talking about). This happens because #169 is part of the
> HTML default character set ISO-8851-1, as well as of many
> others. Hence step 1. above immediately succeeds, producing
> the shortest possible output of one byte length only.
>
> To suppress outputting the (c) copyright sign character, you
> must pick a character encoding which does not contain #169.
> The character set with the smallest number of characters is
> US-ASCII. If you choose this, TDIHtmlWrterPlugin will output
> '©' instead of the (c) copyright sign character
> according to step 2. above.
>
> Again, you might not like '©' but prefer '©'. In
> this case, do not register '©' as an encoding entity.
> This causes step 2. to fail and step 3. to output the numeric
> entity. You can remove selected named entities from the
> encoding registry with the UnRegisterEncodingEntity procedure.
>
> Ralf
>
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