disallow category tokens in the middle of a query string

[nominatim.git] / lib-php / TokenPartial.php

diff --git a/lib-php/TokenPartial.php b/lib-php/TokenPartial.php
index 99a759474edde918b757531ea880f3d783ac77b5..3dc6f308a9e3c1f41e4e236163ccfc448973da48 100644 (file)
--- a/lib-php/TokenPartial.php
+++ b/lib-php/TokenPartial.php
@@ -1,4 +1,12 @@
 <?php
+/**
+ * SPDX-License-Identifier: GPL-2.0-only
+ *
+ * This file is part of Nominatim. (https://nominatim.org)
+ *
+ * Copyright (C) 2022 by the Nominatim developer community.
+ * For a full list of authors see the git log.
+ */
 
 namespace Nominatim\Token;
 
@@ -8,19 +16,99 @@ namespace Nominatim\Token;
 class Partial
 {
     /// Database word id, if applicable.
-    public $iId;
+    private $iId;
     /// Number of appearances in the database.
-    public $iSearchNameCount;
-    /// Normalised version of the partial word.
-    public $sToken;
+    private $iSearchNameCount;
+    /// True, if the token consists exclusively of digits and spaces.
+    private $bNumberToken;
 
     public function __construct($iId, $sToken, $iSearchNameCount)
     {
         $this->iId = $iId;
-        $this->sToken = $sToken;
+        $this->bNumberToken = (bool) preg_match('#^[0-9 ]+$#', $sToken);
         $this->iSearchNameCount = $iSearchNameCount;
     }
 
+    public function getId()
+    {
+        return $this->iId;
+    }
+
+    /**
+     * Check if the token can be added to the given search.
+     * Derive new searches by adding this token to an existing search.
+     *
+     * @param object  $oSearch      Partial search description derived so far.
+     * @param object  $oPosition    Description of the token position within
+                                    the query.
+     *
+     * @return True if the token is compatible with the search configuration
+     *         given the position.
+     */
+    public function isExtendable($oSearch, $oPosition)
+    {
+        return !$oPosition->isPhrase('country');
+    }
+
+    /**
+     * Derive new searches by adding this token to an existing search.
+     *
+     * @param object  $oSearch      Partial search description derived so far.
+     * @param object  $oPosition    Description of the token position within
+                                    the query.
+     *
+     * @return SearchDescription[] List of derived search descriptions.
+     */
+    public function extendSearch($oSearch, $oPosition)
+    {
+        $aNewSearches = array();
+
+        // Partial token in Address.
+        if (($oPosition->isPhrase('') || !$oPosition->isFirstPhrase())
+            && $oSearch->hasName()
+        ) {
+            $iSearchCost = $this->bNumberToken ? 2 : 1;
+            if ($this->iSearchNameCount >= CONST_Max_Word_Frequency) {
+                $iSearchCost += 1;
+            }
+
+            $oNewSearch = $oSearch->clone($iSearchCost);
+            $oNewSearch->addAddressToken(
+                $this->iId,
+                $this->iSearchNameCount < CONST_Max_Word_Frequency
+            );
+
+            $aNewSearches[] = $oNewSearch;
+        }
+
+        // Partial token in Name.
+        if ((!$oSearch->hasPostcode() && !$oSearch->hasAddress())
+            && (!$oSearch->hasName(true)
+                || $oSearch->getNamePhrase() == $oPosition->getPhrase())
+        ) {
+            $iSearchCost = 1;
+            if (!$oSearch->hasName(true)) {
+                $iSearchCost += 1;
+            }
+            if ($this->bNumberToken) {
+                $iSearchCost += 1;
+            }
+
+            $oNewSearch = $oSearch->clone($iSearchCost);
+            $oNewSearch->addPartialNameToken(
+                $this->iId,
+                $this->iSearchNameCount < CONST_Max_Word_Frequency,
+                $this->iSearchNameCount > CONST_Search_NameOnlySearchFrequencyThreshold,
+                $oPosition->getPhrase()
+            );
+
+            $aNewSearches[] = $oNewSearch;
+        }
+
+        return $aNewSearches;
+    }
+
+
     public function debugInfo()
     {
         return array(
@@ -31,4 +119,9 @@ class Partial
                           )
                );
     }
+
+    public function debugCode()
+    {
+        return 'w';
+    }
 }