Posted by Rob Wilkerson on 12/02/07 14:01

On Dec 2, 7:59 am, Jerry Stuckle <jstuck...@attglobal.net> wrote:
> Rob Wilkerson wrote:
> > On Dec 1, 11:46 pm, Jerry Stuckle <jstuck...@attglobal.net> wrote:
> >> No, let's see your entire method - and more importantly, the code that's
> >> calling it. You shouldn't need to do any of the stuff you're doing
> >> here. You have something else wrong, but my crystal ball is broken.
> >> So, without the code it's impossible to see what you've got.
>
> > Okay, then you need a little more background, maybe. I'm working to
> > adapt someone else's custom function into an object oriented
> > architecture. The original function (and definition of constants) can
> > be found athttp://www.pgregg.com/projects/php/preg_find/preg_find.phps.
>
> > My object oriented translation requires just a few changes to the
> > function itself and they're really just syntax changes - except for
> > translating the bitwise expression.
>
> > CALLING THE METHOD:
>
> > require_once ( 'org/client/file/finder.php' );
> > $finder = new Finder();
> > $result = $finder->preg_find ( '/image\.php$/', '/path/to/my/includes/
> > org/client/content', 'PREG_FIND_RECURSIVE|PREG_FIND_RETURNASSOC' );
> > new PHPDump ( $result );
> > exit();
>
> > Note that the flag definitions do not exist yet. If the single quotes
> > in the third argument are removed then the normal (and expected)
> > "constant not defined" errors are thrown. Nor, for that matter, do I
> > *want* them to exist here. I want to keep them with the code where
> > they matter rather than defining them everywhere they're used.
> > Similarly, I want to continue to be able to use the flags because
> > they're more readable than passing in the bit values themselves.
>
> > METHOD CHANGES:
>
> > class Finder {
> > const PREG_FIND_RECURSIVE = 1;
> > const PREG_FIND_DIRMATCH = 2;
> > const PREG_FIND_FULLPATH = 4;
> > const PREG_FIND_NEGATE = 8;
>
> > /**
> > * All of the additional flag constants defined similarly
> > *
> > * SNIP -->
> > */
>
> > public function preg_find ( $pattern, $start_dir='.', $args=NULL ) {
> > /**
> > * Go through the business of evaluating the bit string.
> > */
> > $args_in = $args; /** Save off the input string */
> > $tmp = preg_split ( '/([|&^~])/', $args,
> > -1 ,PREG_SPLIT_DELIM_CAPTURE );
> > $args = '';
>
> > foreach ( $tmp as $arg ) {
> > $args .= defined ( "self::$arg" ) ? constant ( "self::$arg" ) :
> > $arg;
> > }
>
> > /**
> > * Back to doing what we need to do using the bitwise expression
> > that is expected.
> > */
> > static $depth = -1;
> > ++$depth;
>
> > /**
> > * SNIP -->
> > */
> > }
> > }
>
> > Aside from the code shown at the top of the method, only the following
> > changes from the original were made:
>
> > - The syntax of all references to a flag within the method was changed
> > to "self::FLAG_NAME".
> > - In the recursive call to the method, the arguments being passed are
> > the original arguments saved off at the top of the method.
>
> > I've found no other changes that are required thus far.
>
> > Once again, I appreciate your help.
>
> The flags do exist in your code, because you've defined them. Your
> problem is in how you're using them.
>
> You defined the constants in the class, so you need to scope them to the
> class, i.e. Finder::PREG_FIND_RECURSIVE.

Bingo. I didn't realize constants could be accessed that way. And,
as is usually the case, I find it clearly spelled out that way in the
docs once I kind of understand what I'm looking for.

Thanks for your help.

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