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documentation for SearchContext and SearchDescription

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This commit is contained in:
Sarah Hoffmann 2017-10-10 00:15:56 +02:00
parent c02bf4986f
commit c8780da19c
2 changed files with 212 additions and 2 deletions
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104
lib/SearchContext.php
View File

@ -34,27 +34,67 @@ class SearchContext
private $sqlExcludeList = '';
/**
* Check if a reference point is defined.
*
* @return bool True if a reference point is defined.
*/
public function hasNearPoint()
{
return $this->fNearRadius !== false;
}
/**
* Get radius around reference point.
*
* @return float Search radius around refernce point.
*/
public function nearRadius()
{
return $this->fNearRadius;
}
/**
* Set search reference point in WGS84.
*
* If set, then only places around this point will be taken into account.
*
* @param float $fLat Latitude of point.
* @param float $fLon Longitude of point.
* @param float $fRadius Search radius around point.
*
* @return void
*/
public function setNearPoint($fLat, $fLon, $fRadius = 0.1)
{
$this->fNearRadius = $fRadius;
$this->sqlNear = 'ST_SetSRID(ST_Point('.$fLon.','.$fLat.'),4326)';
}
/**
* Check if the search is geographically restricted.
*
* Searches are restricted if a reference point is given or if
* a bounded viewbox is set.
*
* @return bool True, if the search is geographically bounded.
*/
public function isBoundedSearch()
{
return $this->hasNearPoint() || ($this->sqlViewboxSmall && $this->bViewboxBounded);
}
/**
* Set rectangular viewbox.
*
* The viewbox may be bounded which means that no search results
* must be outside the viewbox.
*
* @param float[4] $aViewBox Coordinates of the viewbox.
* @param bool $bBounded True if the viewbox is bounded.
*
* @return void
*/
public function setViewboxFromBox(&$aViewBox, $bBounded)
{
$this->bViewboxBounded = $bBounded;
@ -80,6 +120,19 @@ class SearchContext
);
}
/**
* Set viewbox along a route.
*
* The viewbox may be bounded which means that no search results
* must be outside the viewbox.
*
* @param object $oDB DB connection to use for computing the box.
* @param string[] $aRoutePoints List of x,y coordinates along a route.
* @param float $fRouteWidth Buffer around the route to use.
* @param bool $bBounded True if the viewbox bounded.
*
* @return void
*/
public function setViewboxFromRoute(&$oDB, $aRoutePoints, $fRouteWidth, $bBounded)
{
$this->bViewboxBounded = $bBounded;
@ -101,22 +154,36 @@ class SearchContext
$this->sqlViewboxLarge = "'".$sGeom."'::geometry";
}
/**
* Set list of excluded place IDs.
*
* @param integer[] $aExcluded List of IDs.
*
* @return void
*/
public function setExcludeList($aExcluded)
{
$this->sqlExcludeList = ' not in ('.join(',', $aExcluded).')';
}
/**
* Set list of countries to restrict search to.
*
* @param string[] $aCountries List of two-letter lower-case country codes.
*
* @return void
*/
public function setCountryList($aCountries)
{
$this->sqlCountryList = '('.join(',', array_map('addQuotes', $aCountries)).')';
}
/**
* Extract a coordinate point from a query string.
* Extract a reference point from a query string.
*
* @param string $sQuery Query to scan.
*
* @return The remaining query string.
* @return string The remaining query string.
*/
public function setNearPointFromQuery($sQuery)
{
@ -135,16 +202,41 @@ class SearchContext
return $sQuery;
}
/**
* Get an SQL snipped for computing the distance from the reference point.
*
* @param string $sObj SQL variable name to compute the distance from.
*
* @return string An SQL string.
*/
public function distanceSQL($sObj)
{
return 'ST_Distance('.$this->sqlNear.", $sObj)";
}
/**
* Get an SQL snipped for checking if something is within range of the
* reference point.
*
* @param string $sObj SQL variable name to compute if it is within range.
*
* @return string An SQL string.
*/
public function withinSQL($sObj)
{
return sprintf('ST_DWithin(%s, %s, %F)', $sObj, $this->sqlNear, $this->fNearRadius);
}
/**
* Get an SQL snipped of the importance factor of the viewbox.
*
* The importance factor is computed by checking if an object is within
* the viewbox and/or the extended version of the viewbox.
*
* @param string $sObj SQL variable name of object to weight the importance
*
* @return string SQL snipped of the factor with a leading multiply sign.
*/
public function viewboxImportanceSQL($sObj)
{
$sSQL = '';
@ -159,6 +251,14 @@ class SearchContext
return $sSQL;
}
/**
* SQL snipped checking if a place ID should be excluded.
*
* @param string $sVariable SQL variable name of place ID to check,
* potentially prefixed with more SQL.
*
* @return string SQL snippet.
*/
public function excludeSQL($sVariable)
{
if ($this->sqlExcludeList) {

110
lib/SearchDescription.php
View File

@ -43,22 +43,55 @@ class SearchDescription
private $iNamePhrase = -1;
/**
* Create an empty search description.
*
* @param object $oContext Global context to use. Will be inherited by
* all derived search objects.
*/
public function __construct($oContext)
{
$this->oContext = $oContext;
}
/**
* Get current search rank.
*
* The higher the search rank the lower the likelyhood that the
* search is a correct interpretation of the search query.
*
* @return integer Search rank.
*/
public function getRank()
{
return $this->iSearchRank;
}
/**
* Increase the search rank.
*
* @param integer $iAddRank Number of ranks to increase.
*
* @return void
*/
public function addToRank($iAddRank)
{
$this->iSearchRank += $iAddRank;
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;
@ -66,6 +99,11 @@ class SearchDescription
$this->sType = $sType;
}
/**
* Check if this might be a full address search.
*
* @return bool True if the search contains name, address and housenumber.
*/
public function looksLikeFullAddress()
{
return sizeof($this->aName)
@ -73,11 +111,27 @@ class SearchDescription
&& preg_match('/[0-9]+/', $this->sHouseNumber);
}
/**
* Check if any operator is set.
*
* @return bool True, if this is a special search operation.
*/
public function hasOperator()
{
return $this->iOperator != Operator::NONE;
}
/**
* 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 $sQuery Original query string.
*
* @return string The query string with the special search patterns removed.
*/
public function extractKeyValuePairs($sQuery)
{
// Search for terms of kind [<key>=<value>].
@ -98,6 +152,13 @@ class SearchDescription
return $sQuery;
}
/**
* Check if the combination of parameters is sensible.
*
* @param string[] $aCountryCodes List of country codes.
*
* @return bool True, if the search looks valid.
*/
public function isValidSearch(&$aCountryCodes)
{
if (!sizeof($this->aName)) {
@ -118,6 +179,25 @@ class SearchDescription
/////////// Search building functions
/**
* Derive new searches by adding a full term to the existing search.
*
* @param mixed[] $aSearchTerm Description of the token.
* @param bool $bWordInQuery True, if the normalised version of the word
* is contained in the query.
* @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.
* @param integer $iGlobalRank Changable ranking of all searches in the
* batch.
*
* @return SearchDescription[] List of derived search descriptions.
*/
public function extendWithFullTerm($aSearchTerm, $bWordInQuery, $bHasPartial, $sPhraseType, $bFirstToken, $bFirstPhrase, $bLastToken, &$iGlobalRank)
{
$aNewSearches = array();
@ -247,6 +327,19 @@ class SearchDescription
return $aNewSearches;
}
/**
* Derive new searches by adding a partial term to the existing search.
*
* @param mixed[] $aSearchTerm 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 mixed[] $aWordFrequencyScores Number of times tokens appears
* overall in a planet database.
* @param array[] $aFullTokens List of full term tokens with the
* same name.
*
* @return SearchDescription[] List of derived search descriptions.
*/
public function extendWithPartialTerm($aSearchTerm, $bStructuredPhrases, $iPhrase, &$aWordFrequencyScores, $aFullTokens)
{
// Only allow name terms.
@ -319,6 +412,23 @@ class SearchDescription
/////////// Query functions
/**
* Query database for places that match this search.
*
* @param object $oDB Database connection to use.
* @param mixed[] $aWordFrequencyScores Number of times tokens appears
* overall in a planet database.
* @param mixed[] $aExactMatchCache Saves number of exact matches.
* @param integer $iMinRank Minimum address rank to restrict
* search to.
* @param integer $iMaxRank Maximum address rank to restrict
* search to.
* @param integer $iLimit Maximum number of results.
*
* @return mixed[] An array with two fields: IDs contains the list of
* matching place IDs and houseNumber the houseNumber
* if appicable or -1 if not.
*/
public function query(&$oDB, &$aWordFrequencyScores, &$aExactMatchCache, $iMinRank, $iMaxRank, $iLimit)
{
$aPlaceIDs = array();