Re: [ jEdit-users ] Problems with HASH_CHAR attribute in SPAN_REGEXP tag

[John S. <leg...@gm...>]

Hi Douglas:

Haha, I ended up doing something similar after reading up on my regex :D It
works well enough now, but it can still be flaky. Maybe changes in how the
tags work could improve the situation.

I too noticed the problem with highlighting to the end of the line.  I was
expecting NO_LINE_BREAK to be a condition (i.e., don't apply the SPAN at all
if it would cross a line break), whereas it just stops/continues the
highlighting.

As for SPAN_REGEXP not caring about escaping the ')' in the END tag, I
believe that is because only the BEGIN tag is interpreted as a regex,
whereas the END tag is interpreted as just a string.  If I'm not mistaken,
there was a thread on this and it should be changed in pre17.

Cheers,
John

2009/2/17 Douglas Silas <ds...@gm...>

> John,
>
> There seems to be a bug in the behavior of the SPAN_REGEXP tag.
>
> If we do this, for example:
>
> <SPAN_REGEXP
>             NO_LINE_BREAK="TRUE"
>             TYPE="OPERATOR">
>             <BEGIN>:</BEGIN>
>             <END>)</END>
>         </SPAN_REGEXP>
>
> Then all lines which contain a colon will be highlighted until the end of
> the line (or further, if NO_LINE_BREAK is false or not present). Also, if we
> wanted to specify an actual parenthesis, then we should need to escape it:
> "\)". SPAN_REGEXP doesn't seem to care, for some reason, that we don't
> escape the parenthesis.
>
> Despite the apparent bug, you should be able to use the following, using
> (relunctant) lookahead, to highlight between a colon and an end-parenthesis:
>
> <SPAN_REGEXP
>             NO_LINE_BREAK="TRUE"
>             TYPE="OPERATOR">
>             <BEGIN>:(?=.*?\))</BEGIN>
>             <END>)</END>
>         </SPAN_REGEXP>
>
> Someone else should probably comment on the apparent bug.
>
> Cheers,
>
> Silas
>
> On Tue, Feb 17, 2009 at 12:47 AM, John Smith <leg...@gm...> wrote:
>
>> Hi:
>>
>> I'm using jEdit 4.3pre16 on Ubuntu 8.10.  I'm trying to modify the ML edit
>> mode, but I'm facing a problem.  I try to write the following (the actual
>> code contains some regular expression, but I've just removed it to make it
>> easier):
>>
>> <SPAN_REGEXP .... >
>>    <BEGIN>:</BEGIN>
>>    <END>)</END>
>> </SPAN_REGEXP>
>>
>> However, it fails to highlight stuff between ':' and ')'.  I have to
>> write:
>>
>>
>> <SPAN_REGEXP .... HASH_CHAR=":" >
>>    <BEGIN>:</BEGIN>
>>    <END>)</END>
>> </SPAN_REGEXP>
>>
>> in order to get it to work.  What is weird is if I try to do something
>> like:
>>
>> <SPAN_REGEXP .... >
>>    <BEGIN>a</BEGIN>
>>    <END>)</END>
>> </SPAN_REGEXP>
>>
>> it will highlight stuff between 'a' and ')'.  Is this a bug?
>>
>> In addition, I was wondering what is the purpose of the
>> HASH_CHAR/HASH_CHARS attribute?  Using my above example, it just duplicates
>> what you already have to put in the regular expression for the <BEGIN> tag.
>>
>> Cheers,
>> legit
>>
>>
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