<?php
// $Id: wms-parser.php,v 1.1 2007/10/28 05:41:11 pdeschamps Exp $
// CubeWerx requires at least 10M for wms capabilities
ini_set( 'memory_limit', '20M' );
/**
*
* inherited: +style, +crs, =latlonboundingbox, =boundingbox, +authorityurl
* =dimension, =attribution, =min/maxscaledenominator, =queryable, =cascaded
* =opaque
* attribution: title, onlineresource->xlink:href, logourl(format,onlineresource)
* style: name, title, legendurl(format,onlineresource->xlink:href)
*/
class CapabilitiesParser
{
var $parser;
var $version = NULL; // wms version
var $root = NULL; // root element name (depends on wms version)
var $path = ''; // current path (excluding root)
var $layers = array();
var $layer_level = 0;
var $layer_props;
var $inAttribution = false;
var $inStyle = false;
var $inMetadata = false;
var $element = ''; // current element
var $cbLayer = NULL;
var $cbLayerParams = NULL;
var $numLayers = 0;
function CapabilitiesParser( )
{
$this->parser = xml_parser_create( "UTF-8" );
xml_parser_set_option( $this->parser, XML_OPTION_CASE_FOLDING, 0 );
xml_set_element_handler( $this->parser, array(&$this,"_startElement"), array(&$this,"_endElement") );
xml_set_character_data_handler( $this->parser, array(&$this,"_characterData") );
$this->layer_level = 0;
$this->layer_props = array();
$this->layer_props[ $this->layer_level ] = array( );
$this->layers = array( );
}
function free_parser( )
{
xml_parser_free( $this->parser );
}
function inSomething()
{
return $this->inAttribution || $this->inStyle !== false;
}
function parse( $capabilities, $cbLayer = NULL, $cbLayerParams = NULL )
{
$this->cbLayer = $cbLayer;
$this->cbLayerParams = $cbLayerParams;
return xml_parse( $this->parser, $capabilities, TRUE );
}
function _startElement( $parser, $name, $attrs )
{
//print '_startElement ' . $name . "\n";
if( ! $this->root )
{
$this->root = $name;
$this->version = $attrs['version'];
$this->layer_props[ $this->layer_level ]['wms_version'] = $this->version;
}
else
{
$this->path .= '/' . $name;
}
$this->element = $name;
switch( $name )
{
case 'Attribution':
$this->inAttribution = true;
break;
case 'Style':
$this->inStyle = true;
// $this->layer_props[ $this->layer_level ]['Style'] = array( );
break;
case 'MetadataURL':
$this->inMetadata = true;
break;
case 'OnlineResource':
if( $this->inStyle !== false )
{
$this->layer_props[ $this->layer_level ]['Style'][ $this->inStyle ] = $attrs['xlink:href'];
break;
}
if( $this->inMetadata !== false )
{
$this->layer_props[ $this->layer_level ]['MetadataURL'] = $attrs['xlink:href'];
}
break;
case 'Layer':
// the previous layer is a parent layer of the new one
if( ! isset($this->layer_props[ $this->layer_level ]['layer_id']) )
{
$this->layer_props[ $this->layer_level ]['layer_id'] = $this->numLayers++;
if( $this->cbLayer )
eval( $this->cbLayer . "(\$this->layer_props[\$this->layer_level], \$this->cbLayerParams );" );
else
{
// print $this->layer_level . ' : ' . var_export($this->layer_props[ $this->layer_level ],true) . '<br>';
$this->layers[] = $this->layer_props[ $this->layer_level ];
}
}
else
{
// adjust layer of $this->layer_props[ $this->layer_level ]
// count child layers?
}
$this->layer_level += 1;
// copy layer_props for new layer level and merge new attrs
// @todo: merge only inherited props!
$inherited_values = array();
$inherited_properties = array( 'Style', 'SRS', 'LatLonBoundingBox', 'BoundingBox', 'queryable', 'opaque', 'cascaded' );
foreach( $inherited_properties as $prop )
{
if( isset($this->layer_props[ $this->layer_level - 1 ][$prop]) )
$inherited_values[$prop] = $this->layer_props[ $this->layer_level - 1 ][$prop];
}
$this->layer_props[ $this->layer_level ] = array_merge( $inherited_values, $attrs );
// print var_export( array($name,$attrs,$this->layer_level), true ) . '<br>';
break;
case 'LatLonBoundingBox';
if( $this->layer_level > 0 )
$this->layer_props[ $this->layer_level][ $name ] = $attrs;
break;
case 'BoundingBox':
if( $this->layer_level > 0 )
{
if( ! isset($this->layer_props[ $this->layer_level][ $name ]) )
$this->layer_props[ $this->layer_level][ $name ] = array();
$SRS = $attrs['SRS'];
unset( $attrs['SRS'] );
$this->layer_props[ $this->layer_level][ $name ][$SRS] = $attrs;
}
break;
default:
// print $this->path . ':' . var_export($attrs,true) . '<br>';
break;
}
// print $this->path . ': attrs = ' . var_export($attrs,true) . '<br>';
}
function _characterData( $parser, $data )
{
//print '_characterData ' . $this->element . ':' . $data . "\n";
if( $this->element != '' )
{
$text = trim($data);
if( $this->layer_level == 0 )
{
switch( $this->element )
{
case 'Title':
case 'Name':
case 'Abstract':
//print 'abstract=' . $test . '<br/>';
$this->layer_props[ $this->layer_level][ $this->element ] .= $text;
break;
}
}
if( $this->layer_level > 0 && ! $this->inSomething() )
{
switch( $this->element )
{
case 'Title':
case 'Name':
// if not a style name!!
$this->layer_props[ $this->layer_level][ $this->element ] .= $text;
break;
case 'Abstract':
//print 'abstract=' . $test . '<br/>';
// if not a style name!!
$this->layer_props[ $this->layer_level][ $this->element ] .= $text;
break;
case 'SRS':
if( isset($this->layer_props[ $this->layer_level][ $this->element ])
&& $this->layer_props[ $this->layer_level][ $this->element ] != '' )
{
$this->layer_props[ $this->layer_level][ $this->element ] .= ' ';
}
$this->layer_props[ $this->layer_level][ $this->element ] .= $text;
break;
}
}
else if( $this->inStyle !== false )
{
switch( $this->element )
{
case 'Name':
$this->inStyle .= $text;
break;
}
}
// print $this->path . ':<b>' . $this->element . '=' . $text . '|</b><br>';
// print '---> ' . $this->layer_level . '/' . var_export($this->layer_props[ $this->layer_level],true) . '<br>';
//$this->element = ''; // previously here instead of at start of _endElement
}
}
function _endElement( $parser, $name )
{
//print '_endElement ' . $name . "\n";
$this->element = ''; // instead of at end of _characterData function
$this->path = substr( $this->path, 0, -(1+strlen($name)) );
switch( $name )
{
case 'Layer':
if( ! $this->layer_props[ $this->layer_level ]['layer_id'] )
{
$this->layer_props[ $this->layer_level ]['layer_id'] = $this->numLayers++;
if( $this->cbLayer )
eval( $this->cbLayer . "(\$this->layer_props[\$this->layer_level], \$this->cbLayerParams );" );
else
{
// print $this->layer_level . ' : ' . var_export($this->layer_props[ $this->layer_level ],true) . '<br>';
$this->layers[] = $this->layer_props[ $this->layer_level ];
}
}
$this->layer_level -= 1;
array_pop( $this->layer_props );
break;
case 'Attribution':
$this->inAttribution = false;
break;
case 'Style':
$this->inStyle = false;
break;
case 'Metadata':
$this->inMetadata = false;
break;
default:
break;
}
}
} // CapabilitiesParser
?>