mirror of
https://github.com/osm-search/Nominatim.git
synced 2024-11-23 21:54:10 +03:00
0f87da017f
Multi-word partial terms had an undue advantage over separate partial terms because they only need to pay the penalty once. This changes the behaviour by setting the penalty according to the number of words in the token. This should get rid of search interpretations with low chance of matching. This also fixes handling of exact term matching. We now match against all exact terms of the query, not just a couple of them collected while building the interpretations. Also adds a penalty to very short postcodes.
296 lines
8.9 KiB
PHP
296 lines
8.9 KiB
PHP
<?php
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namespace Nominatim;
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require_once(CONST_BasePath.'/lib/lib.php');
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/**
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* Collection of search constraints that are independent of the
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* actual interpretation of the search query.
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*
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* The search context is shared between all SearchDescriptions. This
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* object mainly serves as context provider for the database queries.
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* Therefore most data is directly cached as SQL statements.
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*/
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class SearchContext
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{
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/// Search radius around a given Near reference point.
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private $fNearRadius = false;
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/// True if search must be restricted to viewbox only.
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public $bViewboxBounded = false;
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/// Reference point for search (as SQL).
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public $sqlNear = '';
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/// Viewbox selected for search (as SQL).
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public $sqlViewboxSmall = '';
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/// Viewbox with a larger buffer around (as SQL).
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public $sqlViewboxLarge = '';
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/// Reference along a route (as SQL).
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public $sqlViewboxCentre = '';
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/// List of countries to restrict search to (as SQL).
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public $sqlCountryList = '';
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/// List of place IDs to exclude (as SQL).
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private $sqlExcludeList = '';
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/// Subset of word ids of full words in the query.
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private $aFullNameWords = array();
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public function setFullNameWords($aWordList)
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{
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$this->aFullNameWords = $aWordList;
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}
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public function getFullNameTerms()
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{
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return $this->aFullNameWords;
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}
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/**
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* Check if a reference point is defined.
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*
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* @return bool True if a reference point is defined.
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*/
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public function hasNearPoint()
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{
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return $this->fNearRadius !== false;
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}
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/**
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* Get radius around reference point.
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*
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* @return float Search radius around reference point.
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*/
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public function nearRadius()
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{
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return $this->fNearRadius;
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}
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/**
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* Set search reference point in WGS84.
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*
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* If set, then only places around this point will be taken into account.
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*
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* @param float $fLat Latitude of point.
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* @param float $fLon Longitude of point.
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* @param float $fRadius Search radius around point.
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*
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* @return void
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*/
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public function setNearPoint($fLat, $fLon, $fRadius = 0.1)
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{
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$this->fNearRadius = $fRadius;
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$this->sqlNear = 'ST_SetSRID(ST_Point('.$fLon.','.$fLat.'),4326)';
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}
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/**
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* Check if the search is geographically restricted.
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*
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* Searches are restricted if a reference point is given or if
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* a bounded viewbox is set.
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*
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* @return bool True, if the search is geographically bounded.
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*/
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public function isBoundedSearch()
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{
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return $this->hasNearPoint() || ($this->sqlViewboxSmall && $this->bViewboxBounded);
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}
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/**
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* Set rectangular viewbox.
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*
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* The viewbox may be bounded which means that no search results
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* must be outside the viewbox.
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*
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* @param float[4] $aViewBox Coordinates of the viewbox.
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* @param bool $bBounded True if the viewbox is bounded.
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*
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* @return void
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*/
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public function setViewboxFromBox(&$aViewBox, $bBounded)
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{
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$this->bViewboxBounded = $bBounded;
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$this->sqlViewboxCentre = '';
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$this->sqlViewboxSmall = sprintf(
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'ST_SetSRID(ST_MakeBox2D(ST_Point(%F,%F),ST_Point(%F,%F)),4326)',
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$aViewBox[0],
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$aViewBox[1],
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$aViewBox[2],
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$aViewBox[3]
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);
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$fHeight = abs($aViewBox[0] - $aViewBox[2]);
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$fWidth = abs($aViewBox[1] - $aViewBox[3]);
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$this->sqlViewboxLarge = sprintf(
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'ST_SetSRID(ST_MakeBox2D(ST_Point(%F,%F),ST_Point(%F,%F)),4326)',
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max($aViewBox[0], $aViewBox[2]) + $fHeight,
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max($aViewBox[1], $aViewBox[3]) + $fWidth,
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min($aViewBox[0], $aViewBox[2]) - $fHeight,
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min($aViewBox[1], $aViewBox[3]) - $fWidth
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);
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}
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/**
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* Set viewbox along a route.
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*
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* The viewbox may be bounded which means that no search results
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* must be outside the viewbox.
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*
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* @param object $oDB Nominatim::DB instance to use for computing the box.
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* @param string[] $aRoutePoints List of x,y coordinates along a route.
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* @param float $fRouteWidth Buffer around the route to use.
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* @param bool $bBounded True if the viewbox bounded.
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*
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* @return void
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*/
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public function setViewboxFromRoute(&$oDB, $aRoutePoints, $fRouteWidth, $bBounded)
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{
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$this->bViewboxBounded = $bBounded;
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$this->sqlViewboxCentre = "ST_SetSRID('LINESTRING(";
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$sSep = '';
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foreach ($aRoutePoints as $aPoint) {
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$fPoint = (float)$aPoint;
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$this->sqlViewboxCentre .= $sSep.$fPoint;
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$sSep = ($sSep == ' ') ? ',' : ' ';
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}
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$this->sqlViewboxCentre .= ")'::geometry,4326)";
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$sSQL = 'ST_BUFFER('.$this->sqlViewboxCentre.','.($fRouteWidth/69).')';
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$sGeom = $oDB->getOne('select '.$sSQL, null, 'Could not get small viewbox');
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$this->sqlViewboxSmall = "'".$sGeom."'::geometry";
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$sSQL = 'ST_BUFFER('.$this->sqlViewboxCentre.','.($fRouteWidth/30).')';
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$sGeom = $oDB->getOne('select '.$sSQL, null, 'Could not get large viewbox');
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$this->sqlViewboxLarge = "'".$sGeom."'::geometry";
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}
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/**
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* Set list of excluded place IDs.
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*
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* @param integer[] $aExcluded List of IDs.
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*
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* @return void
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*/
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public function setExcludeList($aExcluded)
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{
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$this->sqlExcludeList = ' not in ('.join(',', $aExcluded).')';
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}
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/**
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* Set list of countries to restrict search to.
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*
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* @param string[] $aCountries List of two-letter lower-case country codes.
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*
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* @return void
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*/
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public function setCountryList($aCountries)
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{
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$this->sqlCountryList = '('.join(',', array_map('addQuotes', $aCountries)).')';
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}
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/**
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* Extract a reference point from a query string.
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*
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* @param string $sQuery Query to scan.
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*
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* @return string The remaining query string.
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*/
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public function setNearPointFromQuery($sQuery)
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{
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$aResult = parseLatLon($sQuery);
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if ($aResult !== false
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&& $aResult[1] <= 90.1
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&& $aResult[1] >= -90.1
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&& $aResult[2] <= 180.1
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&& $aResult[2] >= -180.1
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) {
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$this->setNearPoint($aResult[1], $aResult[2]);
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$sQuery = trim(str_replace($aResult[0], ' ', $sQuery));
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}
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return $sQuery;
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}
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/**
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* Get an SQL snippet for computing the distance from the reference point.
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*
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* @param string $sObj SQL variable name to compute the distance from.
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*
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* @return string An SQL string.
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*/
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public function distanceSQL($sObj)
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{
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return 'ST_Distance('.$this->sqlNear.", $sObj)";
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}
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/**
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* Get an SQL snippet for checking if something is within range of the
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* reference point.
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*
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* @param string $sObj SQL variable name to compute if it is within range.
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*
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* @return string An SQL string.
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*/
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public function withinSQL($sObj)
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{
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return sprintf('ST_DWithin(%s, %s, %F)', $sObj, $this->sqlNear, $this->fNearRadius);
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}
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/**
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* Get an SQL snippet of the importance factor of the viewbox.
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*
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* The importance factor is computed by checking if an object is within
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* the viewbox and/or the extended version of the viewbox.
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*
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* @param string $sObj SQL variable name of object to weight the importance
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*
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* @return string SQL snippet of the factor with a leading multiply sign.
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*/
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public function viewboxImportanceSQL($sObj)
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{
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$sSQL = '';
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if ($this->sqlViewboxSmall) {
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$sSQL = " * CASE WHEN ST_Contains($this->sqlViewboxSmall, $sObj) THEN 1 ELSE 0.5 END";
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}
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if ($this->sqlViewboxLarge) {
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$sSQL = " * CASE WHEN ST_Contains($this->sqlViewboxLarge, $sObj) THEN 1 ELSE 0.5 END";
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}
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return $sSQL;
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}
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/**
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* SQL snippet checking if a place ID should be excluded.
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*
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* @param string $sVariable SQL variable name of place ID to check,
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* potentially prefixed with more SQL.
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*
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* @return string SQL snippet.
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*/
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public function excludeSQL($sVariable)
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{
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if ($this->sqlExcludeList) {
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return $sVariable.$this->sqlExcludeList;
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}
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return '';
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}
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public function debugInfo()
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{
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return array(
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'Near radius' => $this->fNearRadius,
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'Near point (SQL)' => $this->sqlNear,
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'Bounded viewbox' => $this->bViewboxBounded,
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'Viewbox (SQL, small)' => $this->sqlViewboxSmall,
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'Viewbox (SQL, large)' => $this->sqlViewboxLarge,
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'Viewbox (SQL, centre)' => $this->sqlViewboxCentre,
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'Countries (SQL)' => $this->sqlCountryList,
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'Excluded IDs (SQL)' => $this->sqlExcludeList
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);
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}
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}
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