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[nominatim.git] / lib / SearchDescription.php
diff --git a/lib/SearchDescription.php b/lib/SearchDescription.php
index 1a994acd38207a08d1fab8e3a904f1ca081442b2..079cb8a6e65d1c72d8dd8693e40d740569206d45 100644 (file)
--- a/lib/SearchDescription.php
+++ b/lib/SearchDescription.php
@@ -2,24 +2,9 @@
 
 namespace Nominatim;
 
 
 namespace Nominatim;
 
-/**
- * Operators describing special searches.
- */
-abstract final class Operator
-{
-    /// No operator selected.
-    const NONE = 0;
-    /// Search for POI of the given type.
-    const TYPE = 1;
-    /// Search for POIs near the given place.
-    const NEAR = 2;
-    /// Search for POIS in the given place.
-    const IN = 3;
-    /// Search for POIS named as given.
-    const NAME = 4;
-    /// Search for postcodes.
-    const POSTCODE = 5;
-}
+require_once(CONST_BasePath.'/lib/SpecialSearchOperator.php');
+require_once(CONST_BasePath.'/lib/SearchContext.php');
+require_once(CONST_BasePath.'/lib/Result.php');
 
 /**
  * Description of a single interpretation of a search query.
 
 /**
  * Description of a single interpretation of a search query.
@@ -32,6 +17,8 @@ class SearchDescription
     private $sCountryCode = '';
     /// List of word ids making up the name of the object.
     private $aName = array();
     private $sCountryCode = '';
     /// List of word ids making up the name of the object.
     private $aName = array();
+    /// True if the name is rare enough to force index use on name.
+    private $bRareName = false;
     /// List of word ids making up the address of the object.
     private $aAddress = array();
     /// Subset of word ids of full words making up the address.
     /// List of word ids making up the address of the object.
     private $aAddress = array();
     /// Subset of word ids of full words making up the address.
@@ -50,32 +37,50 @@ class SearchDescription
     private $sHouseNumber = '';
     /// Postcode for the object.
     private $sPostcode = '';
     private $sHouseNumber = '';
     /// Postcode for the object.
     private $sPostcode = '';
-    /// Geographic search area.
-    private $oNearPoint = false;
+    /// Global search constraints.
+    private $oContext;
 
     // Temporary values used while creating the search description.
 
 
     // Temporary values used while creating the search description.
 
-    /// Index of phrase currently processed
+    /// Index of phrase currently processed.
     private $iNamePhrase = -1;
 
     private $iNamePhrase = -1;
 
-    public function getRank()
-    {
-        return $this->iSearchRank;
-    }
-
-    public function getPostCode()
+    /**
+     * Create an empty search description.
+     *
+     * @param object $oContext Global context to use. Will be inherited by
+     *                         all derived search objects.
+     */
+    public function __construct($oContext)
     {
     {
-        return $this->sPostcode;
+        $this->oContext = $oContext;
     }
 
     /**
     }
 
     /**
-     * Set the geographic search radius.
+     * Get current search rank.
+     *
+     * The higher the search rank the lower the likelihood that the
+     * search is a correct interpretation of the search query.
+     *
+     * @return integer Search rank.
      */
      */
-    public function setNear(&$oNearPoint)
+    public function getRank()
     {
     {
-        $this->oNearPoint = $oNearPoint;
+        return $this->iSearchRank;
     }
 
     }
 
+    /**
+     * Make this search a POI search.
+     *
+     * In a POI search, objects are not (only) searched by their name
+     * but also by the primary OSM key/value pair (class and type in Nominatim).
+     *
+     * @param integer $iOperator Type of POI search
+     * @param string  $sClass    Class (or OSM tag key) of POI.
+     * @param string  $sType     Type (or OSM tag value) of POI.
+     *
+     * @return void
+     */
     public function setPoiSearch($iOperator, $sClass, $sType)
     {
         $this->iOperator = $iOperator;
     public function setPoiSearch($iOperator, $sClass, $sType)
     {
         $this->iOperator = $iOperator;
@@ -84,173 +89,486 @@ class SearchDescription
     }
 
     /**
     }
 
     /**
-     * Check if name or address for the search are specified.
+     * Check if this might be a full address search.
+     *
+     * @return bool True if the search contains name, address and housenumber.
      */
      */
-    public function isNamedSearch()
+    public function looksLikeFullAddress()
     {
     {
-        return sizeof($this->aName) > 0 || sizeof($this->aAddress) > 0;
+        return (!empty($this->aName))
+               && (!empty($this->aAddress) || $this->sCountryCode)
+               && preg_match('/[0-9]+/', $this->sHouseNumber);
     }
 
     /**
     }
 
     /**
-     * Check if only a country is requested.
+     * Check if any operator is set.
+     *
+     * @return bool True, if this is a special search operation.
      */
      */
-    public function isCountrySearch()
+    public function hasOperator()
     {
     {
-        return $this->sCountryCode && sizeof($this->aName) == 0
-               && !$this->iOperator && !$this->oNear;
+        return $this->iOperator != Operator::NONE;
     }
 
     /**
     }
 
     /**
-     * Check if a search near a geographic location is requested.
+     * Extract key/value pairs from a query.
+     *
+     * Key/value pairs are recognised if they are of the form [<key>=<value>].
+     * If multiple terms of this kind are found then all terms are removed
+     * but only the first is used for search.
+     *
+     * @param string $sQuery Original query string.
+     *
+     * @return string The query string with the special search patterns removed.
      */
      */
-    public function isNearSearch()
+    public function extractKeyValuePairs($sQuery)
     {
     {
-        return (bool) $this->oNear;
-    }
+        // Search for terms of kind [<key>=<value>].
+        preg_match_all(
+            '/\\[([\\w_]*)=([\\w_]*)\\]/',
+            $sQuery,
+            $aSpecialTermsRaw,
+            PREG_SET_ORDER
+        );
 
 
-    public function isPoiSearch()
-    {
-        return (bool) $this->sClass;
-    }
+        foreach ($aSpecialTermsRaw as $aTerm) {
+            $sQuery = str_replace($aTerm[0], ' ', $sQuery);
+            if (!$this->hasOperator()) {
+                $this->setPoiSearch(Operator::TYPE, $aTerm[1], $aTerm[2]);
+            }
+        }
 
 
-    public function looksLikeFullAddress()
-    {
-        return sizeof($this->aName)
-               && (sizeof($this->aAddress || $this->sCountryCode))
-               && preg_match('/[0-9]+/', $this->sHouseNumber);
+        return $sQuery;
     }
 
     }
 
-    public function isOperator($iType)
+    /**
+     * Check if the combination of parameters is sensible.
+     *
+     * @return bool True, if the search looks valid.
+     */
+    public function isValidSearch()
     {
     {
-        return $this->iOperator == $iType;
-    }
+        if (empty($this->aName)) {
+            if ($this->sHouseNumber) {
+                return false;
+            }
+            if (!$this->sClass && !$this->sCountryCode) {
+                return false;
+            }
+        }
 
 
-    public function hasHouseNumber()
-    {
-        return (bool) $this->sHouseNumber;
+        return true;
     }
 
     }
 
-    private function poiTable()
+    /////////// Search building functions
+
+
+    /**
+     * Derive new searches by adding a full term to the existing search.
+     *
+     * @param object $oSearchTerm  Description of the token.
+     * @param bool   $bHasPartial  True if there are also tokens of partial terms
+     *                             with the same name.
+     * @param string $sPhraseType  Type of phrase the token is contained in.
+     * @param bool   $bFirstToken  True if the token is at the beginning of the
+     *                             query.
+     * @param bool   $bFirstPhrase True if the token is in the first phrase of
+     *                             the query.
+     * @param bool   $bLastToken   True if the token is at the end of the query.
+     *
+     * @return SearchDescription[] List of derived search descriptions.
+     */
+    public function extendWithFullTerm($oSearchTerm, $bHasPartial, $sPhraseType, $bFirstToken, $bFirstPhrase, $bLastToken)
     {
     {
-        return 'place_classtype_'.$this->sClass.'_'.$this->sType;
+        $aNewSearches = array();
+
+        if (($sPhraseType == '' || $sPhraseType == 'country')
+            && is_a($oSearchTerm, '\Nominatim\Token\Country')
+        ) {
+            if (!$this->sCountryCode) {
+                $oSearch = clone $this;
+                $oSearch->iSearchRank++;
+                $oSearch->sCountryCode = $oSearchTerm->sCountryCode;
+                // Country is almost always at the end of the string
+                // - increase score for finding it anywhere else (optimisation)
+                if (!$bLastToken) {
+                    $oSearch->iSearchRank += 5;
+                }
+                $aNewSearches[] = $oSearch;
+            }
+        } elseif (($sPhraseType == '' || $sPhraseType == 'postalcode')
+                  && is_a($oSearchTerm, '\Nominatim\Token\Postcode')
+        ) {
+            // We need to try the case where the postal code is the primary element
+            // (i.e. no way to tell if it is (postalcode, city) OR (city, postalcode)
+            // so try both.
+            if (!$this->sPostcode) {
+                // If we have structured search or this is the first term,
+                // make the postcode the primary search element.
+                if ($this->iOperator == Operator::NONE
+                    && ($sPhraseType == 'postalcode' || $bFirstToken)
+                ) {
+                    $oSearch = clone $this;
+                    $oSearch->iSearchRank++;
+                    $oSearch->iOperator = Operator::POSTCODE;
+                    $oSearch->aAddress = array_merge($this->aAddress, $this->aName);
+                    $oSearch->aName =
+                        array($oSearchTerm->iId => $oSearchTerm->sPostcode);
+                    $aNewSearches[] = $oSearch;
+                }
+
+                // If we have a structured search or this is not the first term,
+                // add the postcode as an addendum.
+                if ($this->iOperator != Operator::POSTCODE
+                    && ($sPhraseType == 'postalcode' || !empty($this->aName))
+                ) {
+                    $oSearch = clone $this;
+                    $oSearch->iSearchRank++;
+                    $oSearch->sPostcode = $oSearchTerm->sPostcode;
+                    $aNewSearches[] = $oSearch;
+                }
+            }
+        } elseif (($sPhraseType == '' || $sPhraseType == 'street')
+                 && is_a($oSearchTerm, '\Nominatim\Token\HouseNumber')
+        ) {
+            if (!$this->sHouseNumber && $this->iOperator != Operator::POSTCODE) {
+                $oSearch = clone $this;
+                $oSearch->iSearchRank++;
+                $oSearch->sHouseNumber = $oSearchTerm->sToken;
+                // sanity check: if the housenumber is not mainly made
+                // up of numbers, add a penalty
+                if (preg_match_all('/[^0-9]/', $oSearch->sHouseNumber, $aMatches) > 2) {
+                    $oSearch->iSearchRank++;
+                }
+                if (empty($oSearchTerm->iId)) {
+                    $oSearch->iSearchRank++;
+                }
+                // also must not appear in the middle of the address
+                if (!empty($this->aAddress)
+                    || (!empty($this->aAddressNonSearch))
+                    || $this->sPostcode
+                ) {
+                    $oSearch->iSearchRank++;
+                }
+                $aNewSearches[] = $oSearch;
+            }
+        } elseif ($sPhraseType == ''
+                  && is_a($oSearchTerm, '\Nominatim\Token\SpecialTerm')
+        ) {
+            if ($this->iOperator == Operator::NONE) {
+                $oSearch = clone $this;
+                $oSearch->iSearchRank++;
+
+                $iOp = $oSearchTerm->iOperator;
+                if ($iOp == Operator::NONE) {
+                    if (!empty($this->aName) || $this->oContext->isBoundedSearch()) {
+                        $iOp = Operator::NAME;
+                    } else {
+                        $iOp = Operator::NEAR;
+                    }
+                    $oSearch->iSearchRank += 2;
+                }
+
+                $oSearch->setPoiSearch(
+                    $iOp,
+                    $oSearchTerm->sClass,
+                    $oSearchTerm->sType
+                );
+                $aNewSearches[] = $oSearch;
+            }
+        } elseif ($sPhraseType != 'country'
+                  && is_a($oSearchTerm, '\Nominatim\Token\Word')
+        ) {
+            $iWordID = $oSearchTerm->iId;
+            // Full words can only be a name if they appear at the beginning
+            // of the phrase. In structured search the name must forcably in
+            // the first phrase. In unstructured search it may be in a later
+            // phrase when the first phrase is a house number.
+            if (!empty($this->aName) || !($bFirstPhrase || $sPhraseType == '')) {
+                if (($sPhraseType == '' || !$bFirstPhrase) && !$bHasPartial) {
+                    $oSearch = clone $this;
+                    $oSearch->iSearchRank++;
+                    $oSearch->aAddress[$iWordID] = $iWordID;
+                    $aNewSearches[] = $oSearch;
+                } else {
+                    $this->aFullNameAddress[$iWordID] = $iWordID;
+                }
+            } else {
+                $oSearch = clone $this;
+                $oSearch->iSearchRank++;
+                $oSearch->aName = array($iWordID => $iWordID);
+                if (CONST_Search_NameOnlySearchFrequencyThreshold) {
+                    $oSearch->bRareName =
+                        $oSearchTerm->iSearchNameCount
+                          < CONST_Search_NameOnlySearchFrequencyThreshold;
+                }
+                $aNewSearches[] = $oSearch;
+            }
+        }
+
+        return $aNewSearches;
     }
 
     }
 
-    public function countryCodeSQL($sVar, $sCountryList)
+    /**
+     * Derive new searches by adding a partial term to the existing search.
+     *
+     * @param string  $sToken             Term for the token.
+     * @param object  $oSearchTerm        Description of the token.
+     * @param bool    $bStructuredPhrases True if the search is structured.
+     * @param integer $iPhrase            Number of the phrase the token is in.
+     * @param array[] $aFullTokens        List of full term tokens with the
+     *                                    same name.
+     *
+     * @return SearchDescription[] List of derived search descriptions.
+     */
+    public function extendWithPartialTerm($sToken, $oSearchTerm, $bStructuredPhrases, $iPhrase, $aFullTokens)
     {
     {
-        if ($this->sCountryCode) {
-            return $sVar.' = \''.$this->sCountryCode."'";
+        // Only allow name terms.
+        if (!(is_a($oSearchTerm, '\Nominatim\Token\Word'))) {
+            return array();
         }
         }
-        if ($sCountryList) {
-            return $sVar.' in ('.$this->sCountryCode.')';
+
+        $aNewSearches = array();
+        $iWordID = $oSearchTerm->iId;
+
+        if ((!$bStructuredPhrases || $iPhrase > 0)
+            && (!empty($this->aName))
+            && strpos($sToken, ' ') === false
+        ) {
+            if ($oSearchTerm->iSearchNameCount < CONST_Max_Word_Frequency) {
+                $oSearch = clone $this;
+                $oSearch->iSearchRank += 2;
+                $oSearch->aAddress[$iWordID] = $iWordID;
+                $aNewSearches[] = $oSearch;
+            } else {
+                $oSearch = clone $this;
+                $oSearch->iSearchRank++;
+                $oSearch->aAddressNonSearch[$iWordID] = $iWordID;
+                if (preg_match('#^[0-9]+$#', $sToken)) {
+                    $oSearch->iSearchRank += 2;
+                }
+                if (!empty($aFullTokens)) {
+                    $oSearch->iSearchRank++;
+                }
+                $aNewSearches[] = $oSearch;
+
+                // revert to the token version?
+                foreach ($aFullTokens as $oSearchTermToken) {
+                    if (is_a($oSearchTermToken, '\Nominatim\Token\Word')) {
+                        $oSearch = clone $this;
+                        $oSearch->iSearchRank++;
+                        $oSearch->aAddress[$oSearchTermToken->iId]
+                            = $oSearchTermToken->iId;
+                        $aNewSearches[] = $oSearch;
+                    }
+                }
+            }
         }
 
         }
 
-        return '';
-    }
+        if ((!$this->sPostcode && !$this->aAddress && !$this->aAddressNonSearch)
+            && (empty($this->aName) || $this->iNamePhrase == $iPhrase)
+        ) {
+            $oSearch = clone $this;
+            $oSearch->iSearchRank += 2;
+            if (empty($this->aName)) {
+                $oSearch->iSearchRank += 1;
+            }
+            if (preg_match('#^[0-9]+$#', $sToken)) {
+                $oSearch->iSearchRank += 2;
+            }
+            if ($oSearchTerm->iSearchNameCount < CONST_Max_Word_Frequency) {
+                if (empty($this->aName)
+                    && CONST_Search_NameOnlySearchFrequencyThreshold
+                ) {
+                    $oSearch->bRareName =
+                        $oSearchTerm->iSearchNameCount
+                          < CONST_Search_NameOnlySearchFrequencyThreshold;
+                } else {
+                    $oSearch->bRareName = false;
+                }
+                $oSearch->aName[$iWordID] = $iWordID;
+            } else {
+                $oSearch->aNameNonSearch[$iWordID] = $iWordID;
+            }
+            $oSearch->iNamePhrase = $iPhrase;
+            $aNewSearches[] = $oSearch;
+        }
 
 
-    public function hasOperator()
-    {
-        return $this->iOperator != Operator::NONE;
+        return $aNewSearches;
     }
 
     }
 
+    /////////// Query functions
+
+
     /**
     /**
-     * Extract special terms from the query, amend the search
-     * and return the shortended query.
+     * Query database for places that match this search.
+     *
+     * @param object  $oDB      Database connection to use.
+     * @param integer $iMinRank Minimum address rank to restrict search to.
+     * @param integer $iMaxRank Maximum address rank to restrict search to.
+     * @param integer $iLimit   Maximum number of results.
      *
      *
-     * Only the first special term found will be used but all will
-     * be removed from the query.
+     * @return mixed[] An array with two fields: IDs contains the list of
+     *                 matching place IDs and houseNumber the houseNumber
+     *                 if appicable or -1 if not.
      */
      */
-    public function extractKeyValuePairs($sQuery)
+    public function query(&$oDB, $iMinRank, $iMaxRank, $iLimit)
     {
     {
-        // Search for terms of kind [<key>=<value>].
-        preg_match_all(
-            '/\\[([\\w_]*)=([\\w_]*)\\]/',
-            $sQuery,
-            $aSpecialTermsRaw,
-            PREG_SET_ORDER
-        );
+        $aResults = array();
+        $iHousenumber = -1;
+
+        if ($this->sCountryCode
+            && empty($this->aName)
+            && !$this->iOperator
+            && !$this->sClass
+            && !$this->oContext->hasNearPoint()
+        ) {
+            // Just looking for a country - look it up
+            if (4 >= $iMinRank && 4 <= $iMaxRank) {
+                $aResults = $this->queryCountry($oDB);
+            }
+        } elseif (empty($this->aName) && empty($this->aAddress)) {
+            // Neither name nor address? Then we must be
+            // looking for a POI in a geographic area.
+            if ($this->oContext->isBoundedSearch()) {
+                $aResults = $this->queryNearbyPoi($oDB, $iLimit);
+            }
+        } elseif ($this->iOperator == Operator::POSTCODE) {
+            // looking for postcode
+            $aResults = $this->queryPostcode($oDB, $iLimit);
+        } else {
+            // Ordinary search:
+            // First search for places according to name and address.
+            $aResults = $this->queryNamedPlace(
+                $oDB,
+                $iMinRank,
+                $iMaxRank,
+                $iLimit
+            );
 
 
-        foreach ($aSpecialTermsRaw as $aTerm) {
-            $sQuery = str_replace($aTerm[0], ' ', $sQuery);
-            if (!$this->hasOperator()) {
-                $this->setPoiSearch(Operator::TYPE, $aTerm[1], $aTerm[2]);
+            //now search for housenumber, if housenumber provided
+            if ($this->sHouseNumber && !empty($aResults)) {
+                $aNamedPlaceIDs = $aResults;
+                $aResults = $this->queryHouseNumber($oDB, $aNamedPlaceIDs);
+
+                if (empty($aResults) && $this->looksLikeFullAddress()) {
+                    $aResults = $aNamedPlaceIDs;
+                }
+            }
+
+            // finally get POIs if requested
+            if ($this->sClass && !empty($aResults)) {
+                $aResults = $this->queryPoiByOperator($oDB, $aResults, $iLimit);
             }
         }
 
             }
         }
 
-        return $sQuery;
+        Debug::printDebugTable('Place IDs', $aResults);
+
+        if (!empty($aResults) && $this->sPostcode) {
+            $sPlaceIds = Result::joinIdsByTable($aResults, Result::TABLE_PLACEX);
+            if ($sPlaceIds) {
+                $sSQL = 'SELECT place_id FROM placex';
+                $sSQL .= ' WHERE place_id in ('.$sPlaceIds.')';
+                $sSQL .= " AND postcode = '".$this->sPostcode."'";
+                Debug::printSQL($sSQL);
+                $aFilteredPlaceIDs = chksql($oDB->getCol($sSQL));
+                if ($aFilteredPlaceIDs) {
+                    $aNewResults = array();
+                    foreach ($aFilteredPlaceIDs as $iPlaceId) {
+                        $aNewResults[$iPlaceId] = $aResults[$iPlaceId];
+                    }
+                    $aResults = $aNewResults;
+                    Debug::printVar('Place IDs after postcode filtering', $aResults);
+                }
+            }
+        }
+
+        return $aResults;
     }
 
     }
 
-    public function queryCountry(&$oDB, $sViewboxSQL)
+
+    private function queryCountry(&$oDB)
     {
         $sSQL = 'SELECT place_id FROM placex ';
         $sSQL .= "WHERE country_code='".$this->sCountryCode."'";
         $sSQL .= ' AND rank_search = 4';
     {
         $sSQL = 'SELECT place_id FROM placex ';
         $sSQL .= "WHERE country_code='".$this->sCountryCode."'";
         $sSQL .= ' AND rank_search = 4';
-        if ($ViewboxSQL) {
-            $sSQL .= " AND ST_Intersects($sViewboxSQL, geometry)";
+        if ($this->oContext->bViewboxBounded) {
+            $sSQL .= ' AND ST_Intersects('.$this->oContext->sqlViewboxSmall.', geometry)';
         }
         }
-        $sSQL .= " ORDER BY st_area(geometry) DESC LIMIT 1";
+        $sSQL .= ' ORDER BY st_area(geometry) DESC LIMIT 1';
 
 
-        if (CONST_Debug) var_dump($sSQL);
+        Debug::printSQL($sSQL);
 
 
-        return chksql($oDB->getCol($sSQL));
+        $aResults = array();
+        foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+            $aResults[$iPlaceId] = new Result($iPlaceId);
+        }
+
+        return $aResults;
     }
 
     }
 
-    public function queryNearbyPoi(&$oDB, $sCountryList, $sViewboxSQL, $sViewboxCentreSQL, $sExcludeSQL, $iLimit)
+    private function queryNearbyPoi(&$oDB, $iLimit)
     {
         if (!$this->sClass) {
             return array();
         }
 
     {
         if (!$this->sClass) {
             return array();
         }
 
+        $aDBResults = array();
         $sPoiTable = $this->poiTable();
 
         $sSQL = 'SELECT count(*) FROM pg_tables WHERE tablename = \''.$sPoiTable."'";
         if (chksql($oDB->getOne($sSQL))) {
             $sSQL = 'SELECT place_id FROM '.$sPoiTable.' ct';
         $sPoiTable = $this->poiTable();
 
         $sSQL = 'SELECT count(*) FROM pg_tables WHERE tablename = \''.$sPoiTable."'";
         if (chksql($oDB->getOne($sSQL))) {
             $sSQL = 'SELECT place_id FROM '.$sPoiTable.' ct';
-            if ($sCountryList) {
+            if ($this->oContext->sqlCountryList) {
                 $sSQL .= ' JOIN placex USING (place_id)';
             }
                 $sSQL .= ' JOIN placex USING (place_id)';
             }
-            if ($this->oNearPoint) {
-                $sSQL .= ' WHERE '.$this->oNearPoint->withinSQL('ct.centroid');
-            } else {
-                $sSQL .= " WHERE ST_Contains($sViewboxSQL, ct.centroid)";
+            if ($this->oContext->hasNearPoint()) {
+                $sSQL .= ' WHERE '.$this->oContext->withinSQL('ct.centroid');
+            } elseif ($this->oContext->bViewboxBounded) {
+                $sSQL .= ' WHERE ST_Contains('.$this->oContext->sqlViewboxSmall.', ct.centroid)';
             }
             }
-            if ($sCountryList) {
-                $sSQL .= " AND country_code in ($sCountryList)";
+            if ($this->oContext->sqlCountryList) {
+                $sSQL .= ' AND country_code in '.$this->oContext->sqlCountryList;
             }
             }
-            if ($sExcludeSQL) {
-                $sSQL .= ' AND place_id not in ('.$sExcludeSQL.')';
-            }
-            if ($sViewboxCentreSQL) {
-                $sSQL .= " ORDER BY ST_Distance($sViewboxCentreSQL, ct.centroid) ASC";
-            } elseif ($this->oNearPoint) {
-                $sSQL .= ' ORDER BY '.$this->oNearPoint->distanceSQL('ct.centroid').' ASC';
+            $sSQL .= $this->oContext->excludeSQL(' AND place_id');
+            if ($this->oContext->sqlViewboxCentre) {
+                $sSQL .= ' ORDER BY ST_Distance(';
+                $sSQL .= $this->oContext->sqlViewboxCentre.', ct.centroid) ASC';
+            } elseif ($this->oContext->hasNearPoint()) {
+                $sSQL .= ' ORDER BY '.$this->oContext->distanceSQL('ct.centroid').' ASC';
             }
             $sSQL .= " limit $iLimit";
             }
             $sSQL .= " limit $iLimit";
-            if (CONST_Debug) var_dump($sSQL);
-            return chksql($this->oDB->getCol($sSQL));
+            Debug::printSQL($sSQL);
+            $aDBResults = chksql($oDB->getCol($sSQL));
         }
 
         }
 
-        if ($this->oNearPoint) {
+        if ($this->oContext->hasNearPoint()) {
             $sSQL = 'SELECT place_id FROM placex WHERE ';
             $sSQL .= 'class=\''.$this->sClass."' and type='".$this->sType."'";
             $sSQL = 'SELECT place_id FROM placex WHERE ';
             $sSQL .= 'class=\''.$this->sClass."' and type='".$this->sType."'";
-            $sSQL .= ' AND '.$this->oNearPoint->withinSQL('geometry');
+            $sSQL .= ' AND '.$this->oContext->withinSQL('geometry');
             $sSQL .= ' AND linked_place_id is null';
             $sSQL .= ' AND linked_place_id is null';
-            if ($sCountryList) {
-                $sSQL .= " AND country_code in ($sCountryList)";
+            if ($this->oContext->sqlCountryList) {
+                $sSQL .= ' AND country_code in '.$this->oContext->sqlCountryList;
             }
             }
-            $sSQL .= ' ORDER BY '.$this->oNearPoint->distanceSQL('centroid')." ASC";
+            $sSQL .= ' ORDER BY '.$this->oContext->distanceSQL('centroid').' ASC';
             $sSQL .= " LIMIT $iLimit";
             $sSQL .= " LIMIT $iLimit";
-            if (CONST_Debug) var_dump($sSQL);
-            return chksql($this->oDB->getCol($sSQL));
+            Debug::printSQL($sSQL);
+            $aDBResults = chksql($oDB->getCol($sSQL));
+        }
+
+        $aResults = array();
+        foreach ($aDBResults as $iPlaceId) {
+            $aResults[$iPlaceId] = new Result($iPlaceId);
         }
 
         }
 
-        return array();
+        return $aResults;
     }
 
     }
 
-    public function queryPostcode(&$oDB, $sCountryList, $iLimit)
+    private function queryPostcode(&$oDB, $iLimit)
     {
     {
-        $sSQL  = 'SELECT p.place_id FROM location_postcode p ';
+        $sSQL = 'SELECT p.place_id FROM location_postcode p ';
 
 
-        if (sizeof($this->aAddress)) {
+        if (!empty($this->aAddress)) {
             $sSQL .= ', search_name s ';
             $sSQL .= 'WHERE s.place_id = p.parent_place_id ';
             $sSQL .= 'AND array_cat(s.nameaddress_vector, s.name_vector)';
             $sSQL .= ', search_name s ';
             $sSQL .= 'WHERE s.place_id = p.parent_place_id ';
             $sSQL .= 'AND array_cat(s.nameaddress_vector, s.name_vector)';
@@ -259,24 +577,31 @@ class SearchDescription
             $sSQL .= 'WHERE ';
         }
 
             $sSQL .= 'WHERE ';
         }
 
-        $sSQL .= "p.postcode = '".pg_escape_string(reset($this->$aName))."'";
-        $sCountryTerm = $this->countryCodeSQL('p.country_code', $sCountryList);
-        if ($sCountryTerm) {
-            $sSQL .= ' AND '.$sCountyTerm;
-        }
+        $sSQL .= "p.postcode = '".reset($this->aName)."'";
+        $sSQL .= $this->countryCodeSQL(' AND p.country_code');
+        $sSQL .= $this->oContext->excludeSQL(' AND p.place_id');
         $sSQL .= " LIMIT $iLimit";
 
         $sSQL .= " LIMIT $iLimit";
 
-        if (CONST_Debug) var_dump($sSQL);
+        Debug::printSQL($sSQL);
+
+        $aResults = array();
+        foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+            $aResults[$iPlaceId] = new Result($iPlaceId, Result::TABLE_POSTCODE);
+        }
 
 
-        return chksql($this->oDB->getCol($sSQL));
+        return $aResults;
     }
 
     }
 
-    public function queryNamedPlace(&$oDB, $aWordFrequencyScores, $sCountryList, $iMinAddressRank, $iMaxAddressRank, $sExcludeSQL, $sViewboxSmall, $sViewboxLarge, $iLimit)
+    private function queryNamedPlace(&$oDB, $iMinAddressRank, $iMaxAddressRank, $iLimit)
     {
         $aTerms = array();
         $aOrder = array();
 
     {
         $aTerms = array();
         $aOrder = array();
 
-        if ($this->sHouseNumber && sizeof($this->aAddress)) {
+        // Sort by existence of the requested house number but only if not
+        // too many results are expected for the street, i.e. if the result
+        // will be narrowed down by an address. Remeber that with ordering
+        // every single result has to be checked.
+        if ($this->sHouseNumber && (!empty($this->aAddress) || $this->sPostcode)) {
             $sHouseNumberRegex = '\\\\m'.$this->sHouseNumber.'\\\\M';
             $aOrder[] = ' (';
             $aOrder[0] .= 'EXISTS(';
             $sHouseNumberRegex = '\\\\m'.$this->sHouseNumber.'\\\\M';
             $aOrder[] = ' (';
             $aOrder[0] .= 'EXISTS(';
@@ -302,75 +627,67 @@ class SearchDescription
             $aOrder[0] .= ') DESC';
         }
 
             $aOrder[0] .= ') DESC';
         }
 
-        if (sizeof($this->aName)) {
+        if (!empty($this->aName)) {
             $aTerms[] = 'name_vector @> '.getArraySQL($this->aName);
         }
             $aTerms[] = 'name_vector @> '.getArraySQL($this->aName);
         }
-        if (sizeof($this->aAddress)) {
+        if (!empty($this->aAddress)) {
             // For infrequent name terms disable index usage for address
             // For infrequent name terms disable index usage for address
-            if (CONST_Search_NameOnlySearchFrequencyThreshold
-                && sizeof($this->aName) == 1
-                && $aWordFrequencyScores[$this->aName[reset($this->aName)]]
-                     < CONST_Search_NameOnlySearchFrequencyThreshold
-            ) {
+            if ($this->bRareName) {
                 $aTerms[] = 'array_cat(nameaddress_vector,ARRAY[]::integer[]) @> '.getArraySQL($this->aAddress);
             } else {
                 $aTerms[] = 'nameaddress_vector @> '.getArraySQL($this->aAddress);
             }
         }
 
                 $aTerms[] = 'array_cat(nameaddress_vector,ARRAY[]::integer[]) @> '.getArraySQL($this->aAddress);
             } else {
                 $aTerms[] = 'nameaddress_vector @> '.getArraySQL($this->aAddress);
             }
         }
 
-        $sCountryTerm = $this->countryCodeSQL('p.country_code', $sCountryList);
+        $sCountryTerm = $this->countryCodeSQL('country_code');
         if ($sCountryTerm) {
             $aTerms[] = $sCountryTerm;
         }
 
         if ($this->sHouseNumber) {
         if ($sCountryTerm) {
             $aTerms[] = $sCountryTerm;
         }
 
         if ($this->sHouseNumber) {
-            $aTerms[] = "address_rank between 16 and 27";
+            $aTerms[] = 'address_rank between 16 and 27';
         } elseif (!$this->sClass || $this->iOperator == Operator::NAME) {
             if ($iMinAddressRank > 0) {
         } elseif (!$this->sClass || $this->iOperator == Operator::NAME) {
             if ($iMinAddressRank > 0) {
-                $aTerms[] = "address_rank >= ".$iMinAddressRank;
+                $aTerms[] = 'address_rank >= '.$iMinAddressRank;
             }
             if ($iMaxAddressRank < 30) {
             }
             if ($iMaxAddressRank < 30) {
-                $aTerms[] = "address_rank <= ".$iMaxAddressRank;
+                $aTerms[] = 'address_rank <= '.$iMaxAddressRank;
             }
         }
 
             }
         }
 
-        if ($this->oNearPoint) {
-            $aTerms[] = $this->oNearPoint->withinSQL('centroid');
-            $aOrder[] = $this->oNearPoint->distanceSQL('centroid');
+        if ($this->oContext->hasNearPoint()) {
+            $aTerms[] = $this->oContext->withinSQL('centroid');
+            $aOrder[] = $this->oContext->distanceSQL('centroid');
         } elseif ($this->sPostcode) {
         } elseif ($this->sPostcode) {
-            if (!sizeof($this->aAddress)) {
+            if (empty($this->aAddress)) {
                 $aTerms[] = "EXISTS(SELECT place_id FROM location_postcode p WHERE p.postcode = '".$this->sPostcode."' AND ST_DWithin(search_name.centroid, p.geometry, 0.1))";
             } else {
                 $aOrder[] = "(SELECT min(ST_Distance(search_name.centroid, p.geometry)) FROM location_postcode p WHERE p.postcode = '".$this->sPostcode."')";
             }
         }
 
                 $aTerms[] = "EXISTS(SELECT place_id FROM location_postcode p WHERE p.postcode = '".$this->sPostcode."' AND ST_DWithin(search_name.centroid, p.geometry, 0.1))";
             } else {
                 $aOrder[] = "(SELECT min(ST_Distance(search_name.centroid, p.geometry)) FROM location_postcode p WHERE p.postcode = '".$this->sPostcode."')";
             }
         }
 
+        $sExcludeSQL = $this->oContext->excludeSQL('place_id');
         if ($sExcludeSQL) {
         if ($sExcludeSQL) {
-            $aTerms = 'place_id not in ('.$sExcludeSQL.')';
+            $aTerms[] = $sExcludeSQL;
         }
 
         }
 
-        if ($sViewboxSmall) {
-           $aTerms[] = 'centroid && '.$sViewboxSmall;
+        if ($this->oContext->bViewboxBounded) {
+            $aTerms[] = 'centroid && '.$this->oContext->sqlViewboxSmall;
         }
 
         }
 
-        if ($this->oNearPoint) {
-            $aOrder[] = $this->oNearPoint->distanceSQL('centroid');
+        if ($this->oContext->hasNearPoint()) {
+            $aOrder[] = $this->oContext->distanceSQL('centroid');
         }
 
         if ($this->sHouseNumber) {
             $sImportanceSQL = '- abs(26 - address_rank) + 3';
         } else {
         }
 
         if ($this->sHouseNumber) {
             $sImportanceSQL = '- abs(26 - address_rank) + 3';
         } else {
-            $sImportanceSQL = '(CASE WHEN importance = 0 OR importance IS NULL THEN 0.75-(search_rank::float/40) ELSE importance END)';
-        }
-        if ($sViewboxSmall) {
-            $sImportanceSQL .= " * CASE WHEN ST_Contains($sViewboxSmall, centroid) THEN 1 ELSE 0.5 END";
-        }
-        if ($sViewboxLarge) {
-            $sImportanceSQL .= " * CASE WHEN ST_Contains($sViewboxLarge, centroid) THEN 1 ELSE 0.5 END";
+            $sImportanceSQL = '(CASE WHEN importance = 0 OR importance IS NULL THEN 0.75001-(search_rank::float/40) ELSE importance END)';
         }
         }
+        $sImportanceSQL .= $this->oContext->viewboxImportanceSQL('centroid');
         $aOrder[] = "$sImportanceSQL DESC";
 
         $aOrder[] = "$sImportanceSQL DESC";
 
-        if (sizeof($this->aFullNameAddress)) {
+        if (!empty($this->aFullNameAddress)) {
             $sExactMatchSQL = ' ( ';
             $sExactMatchSQL .= ' SELECT count(*) FROM ( ';
             $sExactMatchSQL .= '  SELECT unnest('.getArraySQL($this->aFullNameAddress).')';
             $sExactMatchSQL = ' ( ';
             $sExactMatchSQL .= ' SELECT count(*) FROM ( ';
             $sExactMatchSQL .= '  SELECT unnest('.getArraySQL($this->aFullNameAddress).')';
@@ -387,49 +704,57 @@ class SearchDescription
             $iLimit = 20;
         }
 
             $iLimit = 20;
         }
 
-        if (sizeof($aTerms)) {
+        $aResults = array();
+
+        if (!empty($aTerms)) {
             $sSQL = 'SELECT place_id,'.$sExactMatchSQL;
             $sSQL .= ' FROM search_name';
             $sSQL .= ' WHERE '.join(' and ', $aTerms);
             $sSQL .= ' ORDER BY '.join(', ', $aOrder);
             $sSQL .= ' LIMIT '.$iLimit;
 
             $sSQL = 'SELECT place_id,'.$sExactMatchSQL;
             $sSQL .= ' FROM search_name';
             $sSQL .= ' WHERE '.join(' and ', $aTerms);
             $sSQL .= ' ORDER BY '.join(', ', $aOrder);
             $sSQL .= ' LIMIT '.$iLimit;
 
-            if (CONST_Debug) var_dump($sSQL);
+            Debug::printSQL($sSQL);
 
 
-            return chksql(
-                $this->oDB->getAll($sSQL),
-                "Could not get places for search terms."
+            $aDBResults = chksql(
+                $oDB->getAll($sSQL),
+                'Could not get places for search terms.'
             );
             );
+
+            foreach ($aDBResults as $aResult) {
+                $oResult = new Result($aResult['place_id']);
+                $oResult->iExactMatches = $aResult['exactmatch'];
+                $aResults[$aResult['place_id']] = $oResult;
+            }
         }
 
         }
 
-        return array();
+        return $aResults;
     }
 
     }
 
-
-    public function queryHouseNumber(&$oDB, $aRoadPlaceIDs, $sExcludeSQL, $iLimit)
+    private function queryHouseNumber(&$oDB, $aRoadPlaceIDs)
     {
     {
-        $sPlaceIDs = join(',', $aRoadPlaceIDs);
+        $aResults = array();
+        $sPlaceIDs = Result::joinIdsByTable($aRoadPlaceIDs, Result::TABLE_PLACEX);
+
+        if (!$sPlaceIDs) {
+            return $aResults;
+        }
 
         $sHouseNumberRegex = '\\\\m'.$this->sHouseNumber.'\\\\M';
         $sSQL = 'SELECT place_id FROM placex ';
         $sSQL .= 'WHERE parent_place_id in ('.$sPlaceIDs.')';
         $sSQL .= "  AND transliteration(housenumber) ~* E'".$sHouseNumberRegex."'";
 
         $sHouseNumberRegex = '\\\\m'.$this->sHouseNumber.'\\\\M';
         $sSQL = 'SELECT place_id FROM placex ';
         $sSQL .= 'WHERE parent_place_id in ('.$sPlaceIDs.')';
         $sSQL .= "  AND transliteration(housenumber) ~* E'".$sHouseNumberRegex."'";
-        if ($sExcludeSQL) {
-            $sSQL .= ' AND place_id not in ('.$sExcludeSQL.')';
-        }
-        $sSQL .= " LIMIT $iLimit";
-
-        if (CONST_Debug) var_dump($sSQL);
+        $sSQL .= $this->oContext->excludeSQL(' AND place_id');
 
 
-        $aPlaceIDs = chksql($this->oDB->getCol($sSQL));
+        Debug::printSQL($sSQL);
 
 
-        if (sizeof($aPlaceIDs)) {
-            return array('aPlaceIDs' => $aPlaceIDs, 'iHouseNumber' => -1);
+        // XXX should inherit the exactMatches from its parent
+        foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+            $aResults[$iPlaceId] = new Result($iPlaceId);
         }
 
         $bIsIntHouseNumber= (bool) preg_match('/[0-9]+/', $this->sHouseNumber);
         $iHousenumber = intval($this->sHouseNumber);
         }
 
         $bIsIntHouseNumber= (bool) preg_match('/[0-9]+/', $this->sHouseNumber);
         $iHousenumber = intval($this->sHouseNumber);
-        if ($bIsIntHouseNumber) {
+        if ($bIsIntHouseNumber && empty($aResults)) {
             // if nothing found, search in the interpolation line table
             $sSQL = 'SELECT distinct place_id FROM location_property_osmline';
             $sSQL .= ' WHERE startnumber is not NULL';
             // if nothing found, search in the interpolation line table
             $sSQL = 'SELECT distinct place_id FROM location_property_osmline';
             $sSQL .= ' WHERE startnumber is not NULL';
@@ -443,45 +768,36 @@ class SearchDescription
                 $sSQL .= "interpolationtype='odd'";
             }
             $sSQL .= " or interpolationtype='all') and ";
                 $sSQL .= "interpolationtype='odd'";
             }
             $sSQL .= " or interpolationtype='all') and ";
-            $sSQL .= $iHousenumber.">=startnumber and ";
-            $sSQL .= $iHousenumber."<=endnumber";
-
-            if ($sExcludeSQL)) {
-                $sSQL .= ' AND place_id not in ('.$sExcludeSQL.')';
-            }
-            $sSQL .= " limit $iLimit";
+            $sSQL .= $iHousenumber.'>=startnumber and ';
+            $sSQL .= $iHousenumber.'<=endnumber';
+            $sSQL .= $this->oContext->excludeSQL(' AND place_id');
 
 
-            if (CONST_Debug) var_dump($sSQL);
+            Debug::printSQL($sSQL);
 
 
-            $aPlaceIDs = chksql($this->oDB->getCol($sSQL, 0));
-
-            if (sizeof($aPlaceIDs)) {
-                return array('aPlaceIDs' => $aPlaceIDs, 'iHouseNumber' => $iHousenumber);
+            foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+                $oResult = new Result($iPlaceId, Result::TABLE_OSMLINE);
+                $oResult->iHouseNumber = $iHousenumber;
+                $aResults[$iPlaceId] = $oResult;
             }
         }
 
         // If nothing found try the aux fallback table
             }
         }
 
         // If nothing found try the aux fallback table
-        if (CONST_Use_Aux_Location_data) {
+        if (CONST_Use_Aux_Location_data && empty($aResults)) {
             $sSQL = 'SELECT place_id FROM location_property_aux';
             $sSQL .= ' WHERE parent_place_id in ('.$sPlaceIDs.')';
             $sSQL .= " AND housenumber = '".$this->sHouseNumber."'";
             $sSQL = 'SELECT place_id FROM location_property_aux';
             $sSQL .= ' WHERE parent_place_id in ('.$sPlaceIDs.')';
             $sSQL .= " AND housenumber = '".$this->sHouseNumber."'";
-            if ($sExcludeSQL) {
-                $sSQL .= " AND place_id not in ($sExcludeSQL)";
-            }
-            $sSQL .= " limit $iLimit";
-
-            if (CONST_Debug) var_dump($sSQL);
+            $sSQL .= $this->oContext->excludeSQL(' AND place_id');
 
 
-            $aPlaceIDs = chksql($this->oDB->getCol($sSQL));
+            Debug::printSQL($sSQL);
 
 
-            if (sizeof($aPlaceIDs)) {
-                return array('aPlaceIDs' => $aPlaceIDs, 'iHouseNumber' => -1);
+            foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+                $aResults[$iPlaceId] = new Result($iPlaceId, Result::TABLE_AUX);
             }
         }
 
         // If nothing found then search in Tiger data (location_property_tiger)
             }
         }
 
         // If nothing found then search in Tiger data (location_property_tiger)
-        if (CONST_Use_US_Tiger_Data && $bIsIntHouseNumber) {
-            $sSQL = 'SELECT distinct place_id FROM location_property_tiger';
+        if (CONST_Use_US_Tiger_Data && $bIsIntHouseNumber && empty($aResults)) {
+            $sSQL = 'SELECT place_id FROM location_property_tiger';
             $sSQL .= ' WHERE parent_place_id in ('.$sPlaceIDs.') and (';
             if ($iHousenumber % 2 == 0) {
                 $sSQL .= "interpolationtype='even'";
             $sSQL .= ' WHERE parent_place_id in ('.$sPlaceIDs.') and (';
             if ($iHousenumber % 2 == 0) {
                 $sSQL .= "interpolationtype='even'";
@@ -489,31 +805,31 @@ class SearchDescription
                 $sSQL .= "interpolationtype='odd'";
             }
             $sSQL .= " or interpolationtype='all') and ";
                 $sSQL .= "interpolationtype='odd'";
             }
             $sSQL .= " or interpolationtype='all') and ";
-            $sSQL .= $iHousenumber.">=startnumber and ";
-            $sSQL .= $iHousenumber."<=endnumber";
+            $sSQL .= $iHousenumber.'>=startnumber and ';
+            $sSQL .= $iHousenumber.'<=endnumber';
+            $sSQL .= $this->oContext->excludeSQL(' AND place_id');
 
 
-            if ($sExcludeSQL) {
-                $sSQL .= ' AND place_id not in ('.$sExcludeSQL.')';
-            }
-            $sSQL .= " limit $iLimit";
-
-            if (CONST_Debug) var_dump($sSQL);
+            Debug::printSQL($sSQL);
 
 
-            $aPlaceIDs = chksql($this->oDB->getCol($sSQL, 0));
-
-            if (sizeof($aPlaceIDs)) {
-                return array('aPlaceIDs' => $aPlaceIDs, 'iHouseNumber' => $iHousenumber);
+            foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+                $oResult = new Result($iPlaceId, Result::TABLE_TIGER);
+                $oResult->iHouseNumber = $iHousenumber;
+                $aResults[$iPlaceId] = $oResult;
             }
         }
 
             }
         }
 
-        return array();
+        return $aResults;
     }
 
 
     }
 
 
-    public function queryPoiByOperator(&$oDB, $aParentIDs, $sExcludeSQL, $iLimit)
+    private function queryPoiByOperator(&$oDB, $aParentIDs, $iLimit)
     {
     {
-        $sPlaceIDs = join(',', $aParentIDs);
-        $aClassPlaceIDs = array();
+        $aResults = array();
+        $sPlaceIDs = Result::joinIdsByTable($aParentIDs, Result::TABLE_PLACEX);
+
+        if (!$sPlaceIDs) {
+            return $aResults;
+        }
 
         if ($this->iOperator == Operator::TYPE || $this->iOperator == Operator::NAME) {
             // If they were searching for a named class (i.e. 'Kings Head pub')
 
         if ($this->iOperator == Operator::TYPE || $this->iOperator == Operator::NAME) {
             // If they were searching for a named class (i.e. 'Kings Head pub')
@@ -522,24 +838,27 @@ class SearchDescription
             $sSQL .= " WHERE place_id in ($sPlaceIDs)";
             $sSQL .= "   AND class='".$this->sClass."' ";
             $sSQL .= "   AND type='".$this->sType."'";
             $sSQL .= " WHERE place_id in ($sPlaceIDs)";
             $sSQL .= "   AND class='".$this->sClass."' ";
             $sSQL .= "   AND type='".$this->sType."'";
-            $sSQL .= "   AND linked_place_id is null";
-            $sSQL .= " ORDER BY rank_search ASC ";
+            $sSQL .= '   AND linked_place_id is null';
+            $sSQL .= $this->oContext->excludeSQL(' AND place_id');
+            $sSQL .= ' ORDER BY rank_search ASC ';
             $sSQL .= " LIMIT $iLimit";
 
             $sSQL .= " LIMIT $iLimit";
 
-            if (CONST_Debug) var_dump($sSQL);
+            Debug::printSQL($sSQL);
 
 
-            $aClassPlaceIDs = chksql($this->oDB->getCol($sSQL));
+            foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+                $aResults[$iPlaceId] = new Result($iPlaceId);
+            }
         }
 
         // NEAR and IN are handled the same
         if ($this->iOperator == Operator::TYPE || $this->iOperator == Operator::NEAR) {
             $sClassTable = $this->poiTable();
             $sSQL = "SELECT count(*) FROM pg_tables WHERE tablename = '$sClassTable'";
         }
 
         // NEAR and IN are handled the same
         if ($this->iOperator == Operator::TYPE || $this->iOperator == Operator::NEAR) {
             $sClassTable = $this->poiTable();
             $sSQL = "SELECT count(*) FROM pg_tables WHERE tablename = '$sClassTable'";
-            $bCacheTable = (bool) chksql($this->oDB->getOne($sSQL));
+            $bCacheTable = (bool) chksql($oDB->getOne($sSQL));
 
             $sSQL = "SELECT min(rank_search) FROM placex WHERE place_id in ($sPlaceIDs)";
 
             $sSQL = "SELECT min(rank_search) FROM placex WHERE place_id in ($sPlaceIDs)";
-            if (CONST_Debug) var_dump($sSQL);
-            $iMaxRank = (int)chksql($this->oDB->getOne($sSQL));
+            Debug::printSQL($sSQL);
+            $iMaxRank = (int)chksql($oDB->getOne($sSQL));
 
             // For state / country level searches the normal radius search doesn't work very well
             $sPlaceGeom = false;
 
             // For state / country level searches the normal radius search doesn't work very well
             $sPlaceGeom = false;
@@ -549,10 +868,10 @@ class SearchDescription
                 $sSQL .= " WHERE place_id in ($sPlaceIDs)";
                 $sSQL .= "   AND rank_search < $iMaxRank + 5";
                 $sSQL .= "   AND ST_GeometryType(geometry) in ('ST_Polygon','ST_MultiPolygon')";
                 $sSQL .= " WHERE place_id in ($sPlaceIDs)";
                 $sSQL .= "   AND rank_search < $iMaxRank + 5";
                 $sSQL .= "   AND ST_GeometryType(geometry) in ('ST_Polygon','ST_MultiPolygon')";
-                $sSQL .= " ORDER BY rank_search ASC ";
-                $sSQL .= " LIMIT 1";
-                if (CONST_Debug) var_dump($sSQL);
-                $sPlaceGeom = chksql($this->oDB->getOne($sSQL));
+                $sSQL .= ' ORDER BY rank_search ASC ';
+                $sSQL .= ' LIMIT 1';
+                Debug::printSQL($sSQL);
+                $sPlaceGeom = chksql($oDB->getOne($sSQL));
             }
 
             if ($sPlaceGeom) {
             }
 
             if ($sPlaceGeom) {
@@ -561,8 +880,8 @@ class SearchDescription
                 $iMaxRank += 5;
                 $sSQL = 'SELECT place_id FROM placex';
                 $sSQL .= " WHERE place_id in ($sPlaceIDs) and rank_search < $iMaxRank";
                 $iMaxRank += 5;
                 $sSQL = 'SELECT place_id FROM placex';
                 $sSQL .= " WHERE place_id in ($sPlaceIDs) and rank_search < $iMaxRank";
-                if (CONST_Debug) var_dump($sSQL);
-                $aPlaceIDs = chksql($this->oDB->getCol($sSQL));
+                Debug::printSQL($sSQL);
+                $aPlaceIDs = chksql($oDB->getCol($sSQL));
                 $sPlaceIDs = join(',', $aPlaceIDs);
             }
 
                 $sPlaceIDs = join(',', $aPlaceIDs);
             }
 
@@ -573,10 +892,10 @@ class SearchDescription
                     $fRange = 0.05;
 
                     $sOrderBySQL = '';
                     $fRange = 0.05;
 
                     $sOrderBySQL = '';
-                    if ($this->oNearPoint) {
-                        $sOrderBySQL = $this->oNearPoint->distanceSQL('l.centroid');
+                    if ($this->oContext->hasNearPoint()) {
+                        $sOrderBySQL = $this->oContext->distanceSQL('l.centroid');
                     } elseif ($sPlaceIDs) {
                     } elseif ($sPlaceIDs) {
-                        $sOrderBySQL = "ST_Distance(l.centroid, f.geometry)";
+                        $sOrderBySQL = 'ST_Distance(l.centroid, f.geometry)';
                     } elseif ($sPlaceGeom) {
                         $sOrderBySQL = "ST_Distance(st_centroid('".$sPlaceGeom."'), l.centroid)";
                     }
                     } elseif ($sPlaceGeom) {
                         $sOrderBySQL = "ST_Distance(st_centroid('".$sPlaceGeom."'), l.centroid)";
                     }
@@ -592,35 +911,35 @@ class SearchDescription
                     $sSQL .= ' from '.$sClassTable.' as l';
 
                     if ($sPlaceIDs) {
                     $sSQL .= ' from '.$sClassTable.' as l';
 
                     if ($sPlaceIDs) {
-                        $sSQL .= ",placex as f WHERE ";
+                        $sSQL .= ',placex as f WHERE ';
                         $sSQL .= "f.place_id in ($sPlaceIDs) ";
                         $sSQL .= " AND ST_DWithin(l.centroid, f.centroid, $fRange)";
                     } elseif ($sPlaceGeom) {
                         $sSQL .= " WHERE ST_Contains('$sPlaceGeom', l.centroid)";
                     }
 
                         $sSQL .= "f.place_id in ($sPlaceIDs) ";
                         $sSQL .= " AND ST_DWithin(l.centroid, f.centroid, $fRange)";
                     } elseif ($sPlaceGeom) {
                         $sSQL .= " WHERE ST_Contains('$sPlaceGeom', l.centroid)";
                     }
 
-                    if ($sExcludeSQL) {
-                        $sSQL .= ' AND l.place_id not in ('.$sExcludeSQL.')';
-                    }
+                    $sSQL .= $this->oContext->excludeSQL(' AND l.place_id');
                     $sSQL .= 'limit 300) i ';
                     if ($sOrderBySQL) {
                         $sSQL .= 'order by order_term asc';
                     }
                     $sSQL .= " limit $iLimit";
 
                     $sSQL .= 'limit 300) i ';
                     if ($sOrderBySQL) {
                         $sSQL .= 'order by order_term asc';
                     }
                     $sSQL .= " limit $iLimit";
 
-                    if (CONST_Debug) var_dump($sSQL);
+                    Debug::printSQL($sSQL);
 
 
-                    $aClassPlaceIDs = array_merge($aClassPlaceIDs, chksql($this->oDB->getCol($sSQL)));
+                    foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+                        $aResults[$iPlaceId] = new Result($iPlaceId);
+                    }
                 } else {
                 } else {
-                    if ($this->oNearPoint) {
-                        $fRange = $this->oNearPoint->radius();
+                    if ($this->oContext->hasNearPoint()) {
+                        $fRange = $this->oContext->nearRadius();
                     }
 
                     $sOrderBySQL = '';
                     }
 
                     $sOrderBySQL = '';
-                    if ($this->oNearPoint) {
-                        $sOrderBySQL = $this->oNearPoint->distanceSQL('l.geometry');
+                    if ($this->oContext->hasNearPoint()) {
+                        $sOrderBySQL = $this->oContext->distanceSQL('l.geometry');
                     } else {
                     } else {
-                        $sOrderBySQL = "ST_Distance(l.geometry, f.geometry)";
+                        $sOrderBySQL = 'ST_Distance(l.geometry, f.geometry)';
                     }
 
                     $sSQL = 'SELECT distinct l.place_id';
                     }
 
                     $sSQL = 'SELECT distinct l.place_id';
@@ -632,21 +951,94 @@ class SearchDescription
                     $sSQL .= "  AND ST_DWithin(l.geometry, f.centroid, $fRange)";
                     $sSQL .= "  AND l.class='".$this->sClass."'";
                     $sSQL .= "  AND l.type='".$this->sType."'";
                     $sSQL .= "  AND ST_DWithin(l.geometry, f.centroid, $fRange)";
                     $sSQL .= "  AND l.class='".$this->sClass."'";
                     $sSQL .= "  AND l.type='".$this->sType."'";
-                    if ($sExcludeSQL) {
-                        $sSQL .= " AND l.place_id not in (".$sExcludeSQL.")";
-                    }
+                    $sSQL .= $this->oContext->excludeSQL(' AND l.place_id');
                     if ($sOrderBySQL) {
                     if ($sOrderBySQL) {
-                        $sSQL .= "ORDER BY orderterm ASC";
+                        $sSQL .= 'ORDER BY orderterm ASC';
                     }
                     $sSQL .= " limit $iLimit";
 
                     }
                     $sSQL .= " limit $iLimit";
 
-                    if (CONST_Debug) var_dump($sSQL);
+                    Debug::printSQL($sSQL);
 
 
-                    $aClassPlaceIDs = array_merge($aClassPlaceIDs, chksql($this->oDB->getCol($sSQL)));
+                    foreach (chksql($oDB->getCol($sSQL)) as $iPlaceId) {
+                        $aResults[$iPlaceId] = new Result($iPlaceId);
+                    }
                 }
             }
         }
 
                 }
             }
         }
 
-        return $aClassPlaceIDs;
+        return $aResults;
+    }
+
+    private function poiTable()
+    {
+        return 'place_classtype_'.$this->sClass.'_'.$this->sType;
+    }
+
+    private function countryCodeSQL($sVar)
+    {
+        if ($this->sCountryCode) {
+            return $sVar.' = \''.$this->sCountryCode."'";
+        }
+        if ($this->oContext->sqlCountryList) {
+            return $sVar.' in '.$this->oContext->sqlCountryList;
+        }
+
+        return '';
     }
     }
-};
+
+    /////////// Sort functions
+
+
+    public static function bySearchRank($a, $b)
+    {
+        if ($a->iSearchRank == $b->iSearchRank) {
+            return $a->iOperator + strlen($a->sHouseNumber)
+                     - $b->iOperator - strlen($b->sHouseNumber);
+        }
+
+        return $a->iSearchRank < $b->iSearchRank ? -1 : 1;
+    }
+
+    //////////// Debugging functions
+
+
+    public function debugInfo()
+    {
+        return array(
+                'Search rank' => $this->iSearchRank,
+                'Country code' => $this->sCountryCode,
+                'Name terms' => $this->aName,
+                'Name terms (stop words)' => $this->aNameNonSearch,
+                'Address terms' => $this->aAddress,
+                'Address terms (stop words)' => $this->aAddressNonSearch,
+                'Address terms (full words)' => $this->aFullNameAddress,
+                'Special search' => $this->iOperator,
+                'Class' => $this->sClass,
+                'Type' => $this->sType,
+                'House number' => $this->sHouseNumber,
+                'Postcode' => $this->sPostcode
+               );
+    }
+
+    public function dumpAsHtmlTableRow(&$aWordIDs)
+    {
+        $kf = function ($k) use (&$aWordIDs) {
+            return $aWordIDs[$k];
+        };
+
+        echo '<tr>';
+        echo "<td>$this->iSearchRank</td>";
+        echo '<td>'.join(', ', array_map($kf, $this->aName)).'</td>';
+        echo '<td>'.join(', ', array_map($kf, $this->aNameNonSearch)).'</td>';
+        echo '<td>'.join(', ', array_map($kf, $this->aAddress)).'</td>';
+        echo '<td>'.join(', ', array_map($kf, $this->aAddressNonSearch)).'</td>';
+        echo '<td>'.$this->sCountryCode.'</td>';
+        echo '<td>'.Operator::toString($this->iOperator).'</td>';
+        echo '<td>'.$this->sClass.'</td>';
+        echo '<td>'.$this->sType.'</td>';
+        echo '<td>'.$this->sPostcode.'</td>';
+        echo '<td>'.$this->sHouseNumber.'</td>';
+
+        echo '</tr>';
+    }
+}
Open Source search based on OpenStreetMap data