convert phrase array to class

2017-10-12 22:37:44 +02:00
parent 7ea1ef3feb
commit 023f94b066
3 changed files with 112 additions and 78 deletions
--- a/lib/Phrase.php
+++ b/lib/Phrase.php
@@ -0,0 +1,92 @@
+<?php
+
+namespace Nominatim;
+
+/**
+ * Segment of a query string.
+ *
+ * The parts of a query strings are usually separated by commas.
+ */
+class Phrase
+{
+    CONST MAX_DEPTH = 7;
+
+    // Complete phrase as a string.
+    private $sPhrase;
+    // Element type for structured searches.
+    private $sPhraseType;
+    // Space-separated words of the phrase.
+    private $aWords;
+    // Possible segmentations of the phrase.
+    private $aWordSets;
+
+
+    public function __construct($sPhrase, $sPhraseType)
+    {
+        $this->sPhrase = trim($sPhrase);
+        $this->sPhraseType = $sPhraseType;
+        $this->aWords = explode(' ', $this->sPhrase);
+        $this->aWordSets = $this->createWordSets($this->aWords, 0);
+    }
+
+    public function getPhraseType()
+    {
+        return $this->sPhraseType;
+    }
+
+    public function getWordSets()
+    {
+        return $this->aWordSets;
+    }
+
+    public function addTokens(&$aTokens)
+    {
+        foreach ($this->aWordSets as $aSet) {
+            foreach ($aSet as $sWord) {
+                $aTokens[' '.$sWord] = ' '.$sWord;
+                $aTokens[$sWord] = $sWord;
+            }
+        }
+    }
+
+    public function invertWordSets()
+    {
+        $this->aWordSets = $this->createInverseWordSets($this->aWords, 0);
+    }
+
+    private function createWordSets($aWords, $iDepth)
+    {
+        $aResult = array(array(join(' ', $aWords)));
+        $sFirstToken = '';
+        if ($iDepth < Phrase::MAX_DEPTH) {
+            while (sizeof($aWords) > 1) {
+                $sWord = array_shift($aWords);
+                $sFirstToken .= ($sFirstToken?' ':'').$sWord;
+                $aRest = $this->createWordSets($aWords, $iDepth + 1);
+                foreach ($aRest as $aSet) {
+                    $aResult[] = array_merge(array($sFirstToken), $aSet);
+                }
+            }
+        }
+
+        return $aResult;
+    }
+
+    public function createInverseWordSets($aWords, $iDepth)
+    {
+        $aResult = array(array(join(' ', $aWords)));
+        $sFirstToken = '';
+        if ($iDepth < Phrase::MAX_DEPTH) {
+            while (sizeof($aWords) > 1) {
+                $sWord = array_pop($aWords);
+                $sFirstToken = $sWord.($sFirstToken?' ':'').$sFirstToken;
+                $aRest = $this->createInverseWordSets($aWords, $iDepth + 1);
+                foreach ($aRest as $aSet) {
+                    $aResult[] = array_merge(array($sFirstToken), $aSet);
+                }
+            }
+        }
+
+        return $aResult;
+    }
+};