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