only print non-empty search tables

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

diff --git a/lib-php/TokenWord.php b/lib-php/TokenWord.php
index fc28535d4582e459f5d88c72b8977efaf1930fa9..a7557d38b51c8c97a2cf12baf1c7776cb5bc25c8 100644 (file)
--- a/lib-php/TokenWord.php
+++ b/lib-php/TokenWord.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;
 
@@ -8,31 +16,95 @@ namespace Nominatim\Token;
 class Word
 {
     /// Database word id, if applicable.
-    public $iId;
-    /// If true, the word may represent only part of a place name.
-    public $bPartial;
+    private $iId;
     /// Number of appearances in the database.
-    public $iSearchNameCount;
+    private $iSearchNameCount;
     /// Number of terms in the word.
-    public $iTermCount;
+    private $iTermCount;
 
-    public function __construct($iId, $bPartial, $iSearchNameCount, $iTermCount)
+    public function __construct($iId, $iSearchNameCount, $iTermCount)
     {
         $this->iId = $iId;
-        $this->bPartial = $bPartial;
         $this->iSearchNameCount = $iSearchNameCount;
         $this->iTermCount = $iTermCount;
     }
 
+    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, $oPosition)
+    {
+        // Full words can only be a name if they appear at the beginning
+        // of the phrase. In structured search the name must forcibly in
+        // the first phrase. In unstructured search it may be in a later
+        // phrase when the first phrase is a house number.
+        if ($oSearch->hasName()
+            || !($oPosition->isFirstPhrase() || $oPosition->isPhrase(''))
+        ) {
+            if ($this->iTermCount > 1
+                && ($oPosition->isPhrase('') || !$oPosition->isFirstPhrase())
+            ) {
+                $oNewSearch = $oSearch->clone(1);
+                $oNewSearch->addAddressToken($this->iId);
+
+                return array($oNewSearch);
+            }
+        } elseif (!$oSearch->hasName(true)) {
+            $oNewSearch = $oSearch->clone(1);
+            $oNewSearch->addNameToken(
+                $this->iId,
+                CONST_Search_NameOnlySearchFrequencyThreshold
+                && $this->iSearchNameCount
+                          < CONST_Search_NameOnlySearchFrequencyThreshold
+            );
+
+            return array($oNewSearch);
+        }
+
+        return array();
+    }
+
     public function debugInfo()
     {
         return array(
                 'ID' => $this->iId,
                 'Type' => 'word',
                 'Info' => array(
-                           'partial' => $this->bPartial,
-                           'count' => $this->iSearchNameCount
+                           'count' => $this->iSearchNameCount,
+                           'terms' => $this->iTermCount
                           )
                );
     }
+
+    public function debugCode()
+    {
+        return 'W';
+    }
 }