[ka-Map-dev] [Bug 1303] New: variable substitution

[bugzilla-daemon at bugzilla.maptools.org]

http://bugzilla.maptools.org/show_bug.cgi?id=1303

           Summary: variable substitution
           Product: ka-Map
           Version: 0.3
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: core
        AssignedTo: ka-map-dev at lists.maptools.org
        ReportedBy: tim at commenspace.org


If ka-Map handled variable substitution similar to MapServer CGI, there would be
less of a need for people to customize the "core" - especially for including
dynamic data.  This would require a solutions to bug #1290 as well.

I'm thinking that something like the following in tile.php (just before
$oMap->draw()) would do the trick [Note that this is untested code].  In
addition, all calls to tile.php would have to have additional variables added to
the query string.

        /* Variable substitution
         * Looks through the mapfile for any pattern like %variable%
         * and then replaces that with the value of $_REQUEST['variable'].
         * Works for layer->data, layer->connection, layer->filter, and
         * for class->expression.  If %variable% exists in a layer but not
         * in the request, then the layer is turned off before drawing.
         */
        for($i = 0; $i < $nLayers; ++$i) {
            $oLayer = $oMap->getLayer($i);
            if($oLayer->status != MS_OFF) {
                $data = $oLayer->data;
                if(preg_match_all("/%(\w+)%/", $data, $matches, PREG_SET_ORDER)
> 0) {
                    foreach($matches as $match) {
                        $key = $match[1];
                        if(isset($_REQUEST[$key])) {
                            $oLayer->set("data", str_replace($match[0],
$_REQUEST[$key], $data));
                        } else {
                            $oLayer->set("status", MS_OFF);
                        }
                    }
                }
                $connection = $oLayer->connection;
                if(preg_match_all("/%(\w+)%/", $connection, $matches,
PREG_SET_ORDER) > 0) {
                    foreach($matches as $match) {
                        $key = $match[1];
                        if(isset($_REQUEST[$key])) {
                            $oLayer->set("connection", str_replace($match[0],
$_REQUEST[$key], $connection));
                        } else {
                            $oLayer->set("status", MS_OFF);
                        }
                    }
                }
                $filter = $oLayer->getFilter();
                if(preg_match_all("/%(\w+)%/", $filter, $matches,
PREG_SET_ORDER) > 0) {
                    foreach($matches as $match) {
                        $key = $match[1];
                        if(isset($_REQUEST[$key])) {
                            $oLayer->setFilter(str_replace($match[0],
$_REQUEST[$key], $filter));
                        } else {
                            $oLayer->set("status", MS_OFF);
                        }
                    }
                }
                for($j = 0; $j < $oLayer->numclasses; ++$j) {
                    $oClass = $oLayer->getClass($j);
                    $expression = $oClass->getExpression();
                    if(preg_match_all("/%(\w+)%/", $expression, $matches,
PREG_SET_ORDER) > 0) {
                        foreach($matches as $match) {
                            $key = $match[1];
                            if(isset($_REQUEST[$key])) {
                                $oLayer->setExpression(str_replace($match[0],
$_REQUEST[$key], $expression));
                            } else {
                                $oLayer->set("status", MS_OFF);
                            }
                        }
                    }
                }
            }
        }



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