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add PHP part for new ICU-base tokenizer
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Sarah Hoffmann
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commit
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238
lib-php/tokenizer/legacy_icu_tokenizer.php
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238
lib-php/tokenizer/legacy_icu_tokenizer.php
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@ -0,0 +1,238 @@
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<?php
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namespace Nominatim;
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class Tokenizer
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{
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private $oDB;
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private $oNormalizer;
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private $oTransliterator;
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private $aCountryRestriction;
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public function __construct(&$oDB)
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{
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$this->oDB =& $oDB;
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$this->oNormalizer = \Transliterator::createFromRules(CONST_Term_Normalization_Rules);
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$this->oTransliterator = \Transliterator::createFromRules(CONST_Transliteration);
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}
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public function checkStatus()
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{
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$sSQL = "SELECT word_id FROM word WHERE word_token IN (' a')";
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$iWordID = $this->oDB->getOne($sSQL);
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if ($iWordID === false) {
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throw new Exception('Query failed', 703);
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}
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if (!$iWordID) {
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throw new Exception('No value', 704);
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}
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}
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public function setCountryRestriction($aCountries)
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{
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$this->aCountryRestriction = $aCountries;
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}
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public function normalizeString($sTerm)
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{
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if ($this->oNormalizer === null) {
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return $sTerm;
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}
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return $this->oNormalizer->transliterate($sTerm);
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}
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private function makeStandardWord($sTerm)
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{
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$sNorm = ' '.$this->oTransliterator->transliterate($sTerm).' ';
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return trim(str_replace(CONST_Abbreviations[0], CONST_Abbreviations[1], $sNorm));
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}
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public function tokensForSpecialTerm($sTerm)
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{
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$aResults = array();
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$sSQL = 'SELECT word_id, class, type FROM word ';
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$sSQL .= ' WHERE word_token = \' \' || :term';
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$sSQL .= ' AND class is not null AND class not in (\'place\')';
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Debug::printVar('Term', $sTerm);
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Debug::printSQL($sSQL);
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$aSearchWords = $this->oDB->getAll($sSQL, array(':term' => $this->makeStandardWord($sTerm)));
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Debug::printVar('Results', $aSearchWords);
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foreach ($aSearchWords as $aSearchTerm) {
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$aResults[] = new \Nominatim\Token\SpecialTerm(
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$aSearchTerm['word_id'],
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$aSearchTerm['class'],
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$aSearchTerm['type'],
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\Nominatim\Operator::TYPE
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);
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}
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Debug::printVar('Special term tokens', $aResults);
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return $aResults;
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}
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public function extractTokensFromPhrases(&$aPhrases)
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{
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$sNormQuery = '';
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$aWordLists = array();
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$aTokens = array();
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foreach ($aPhrases as $iPhrase => $oPhrase) {
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$sNormQuery .= ','.$this->normalizeString($oPhrase->getPhrase());
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$sPhrase = $this->makeStandardWord($oPhrase->getPhrase());
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if (strlen($sPhrase) > 0) {
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$aWords = explode(' ', $sPhrase);
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Tokenizer::addTokens($aTokens, $aWords);
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$aWordLists[] = $aWords;
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} else {
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$aWordLists[] = array();
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}
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}
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Debug::printVar('Tokens', $aTokens);
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Debug::printVar('WordLists', $aWordLists);
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$oValidTokens = $this->computeValidTokens($aTokens, $sNormQuery);
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foreach ($aPhrases as $iPhrase => $oPhrase) {
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$oPhrase->computeWordSets($aWordLists[$iPhrase], $oValidTokens);
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}
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return $oValidTokens;
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}
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private function computeValidTokens($aTokens, $sNormQuery)
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{
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$oValidTokens = new TokenList();
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if (!empty($aTokens)) {
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$this->addTokensFromDB($oValidTokens, $aTokens, $sNormQuery);
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// Try more interpretations for Tokens that could not be matched.
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foreach ($aTokens as $sToken) {
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if ($sToken[0] == ' ' && !$oValidTokens->contains($sToken)) {
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if (preg_match('/^ ([0-9]{5}) [0-9]{4}$/', $sToken, $aData)) {
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// US ZIP+4 codes - merge in the 5-digit ZIP code
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$oValidTokens->addToken(
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$sToken,
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new Token\Postcode(null, $aData[1], 'us')
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);
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} elseif (preg_match('/^ [0-9]+$/', $sToken)) {
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// Unknown single word token with a number.
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// Assume it is a house number.
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$oValidTokens->addToken(
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$sToken,
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new Token\HouseNumber(null, trim($sToken))
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);
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}
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}
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}
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}
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return $oValidTokens;
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}
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private function addTokensFromDB(&$oValidTokens, $aTokens, $sNormQuery)
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{
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// Check which tokens we have, get the ID numbers
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$sSQL = 'SELECT word_id, word_token, word, class, type, country_code,';
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$sSQL .= ' operator, coalesce(search_name_count, 0) as count';
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$sSQL .= ' FROM word WHERE word_token in (';
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$sSQL .= join(',', $this->oDB->getDBQuotedList($aTokens)).')';
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Debug::printSQL($sSQL);
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$aDBWords = $this->oDB->getAll($sSQL, null, 'Could not get word tokens.');
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foreach ($aDBWords as $aWord) {
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$oToken = null;
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$iId = (int) $aWord['word_id'];
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if ($aWord['class']) {
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// Special terms need to appear in their normalized form.
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// (postcodes are not normalized in the word table)
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$sNormWord = $this->normalizeString($aWord['word']);
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if ($aWord['word'] && strpos($sNormQuery, $sNormWord) === false) {
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continue;
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}
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if ($aWord['class'] == 'place' && $aWord['type'] == 'house') {
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$oToken = new Token\HouseNumber($iId, trim($aWord['word_token']));
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} elseif ($aWord['class'] == 'place' && $aWord['type'] == 'postcode') {
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if ($aWord['word']
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&& pg_escape_string($aWord['word']) == $aWord['word']
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) {
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$oToken = new Token\Postcode(
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$iId,
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$aWord['word'],
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$aWord['country_code']
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);
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}
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} else {
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// near and in operator the same at the moment
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$oToken = new Token\SpecialTerm(
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$iId,
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$aWord['class'],
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$aWord['type'],
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$aWord['operator'] ? Operator::NEAR : Operator::NONE
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);
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}
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} elseif ($aWord['country_code']) {
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// Filter country tokens that do not match restricted countries.
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if (!$this->aCountryRestriction
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|| in_array($aWord['country_code'], $this->aCountryRestriction)
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) {
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$oToken = new Token\Country($iId, $aWord['country_code']);
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}
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} else {
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$oToken = new Token\Word(
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$iId,
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$aWord['word_token'][0] != ' ',
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(int) $aWord['count'],
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substr_count($aWord['word_token'], ' ')
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);
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}
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if ($oToken) {
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$oValidTokens->addToken($aWord['word_token'], $oToken);
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}
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}
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}
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/**
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* Add the tokens from this phrase to the given list of tokens.
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*
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* @param string[] $aTokens List of tokens to append.
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*
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* @return void
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*/
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private static function addTokens(&$aTokens, $aWords)
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{
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$iNumWords = count($aWords);
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for ($i = 0; $i < $iNumWords; $i++) {
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$sPhrase = $aWords[$i];
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$aTokens[' '.$sPhrase] = ' '.$sPhrase;
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$aTokens[$sPhrase] = $sPhrase;
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for ($j = $i + 1; $j < $iNumWords; $j++) {
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$sPhrase .= ' '.$aWords[$j];
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$aTokens[' '.$sPhrase] = ' '.$sPhrase;
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$aTokens[$sPhrase] = $sPhrase;
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}
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}
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}
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}
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@ -133,15 +133,18 @@ class LegacyICUTokenizer:
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def _install_php(self, config):
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""" Install the php script for the tokenizer.
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"""
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abbr_inverse = list(zip(*self.abbreviations))
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php_file = self.data_dir / "tokenizer.php"
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php_file.write_text(dedent("""\
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<?php
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@define('CONST_Max_Word_Frequency', {1.MAX_WORD_FREQUENCY});
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@define('CONST_Term_Normalization_Rules', "{0.normalization}");
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@define('CONST_Transliteration'. "{0.transliteration}");
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# XXX abreviations
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@define('CONST_Transliteration', "{0.transliteration}");
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@define('CONST_Abbreviations', array(array('{2}'), array('{3}')));
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require_once('{1.lib_dir.php}/tokenizer/legacy_icu_tokenizer.php');
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""".format(self, config)))
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""".format(self, config,
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"','".join(abbr_inverse[0]),
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"','".join(abbr_inverse[1]))))
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def _save_config(self, config):
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