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545 lines
17 KiB
PHP
Executable file
545 lines
17 KiB
PHP
Executable file
<?php
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/**
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* @author Mike Cochrane <mikec@mikenz.geek.nz>
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* @author Nick Pope <nick@nickpope.me.uk>
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* @copyright Copyright © 2010, Mike Cochrane, Nick Pope
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License v2.0
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*/
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namespace App\Util\Lexer;
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/**
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* Twitter Extractor Class.
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*
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* Parses tweets and extracts URLs, usernames, username/list pairs and
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* hashtags.
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*
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* Originally written by {@link http://github.com/mikenz Mike Cochrane}, this
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* is based on code by {@link http://github.com/mzsanford Matt Sanford} and
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* heavily modified by {@link http://github.com/ngnpope Nick Pope}.
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*
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* @author Mike Cochrane <mikec@mikenz.geek.nz>
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* @author Nick Pope <nick@nickpope.me.uk>
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* @copyright Copyright © 2010, Mike Cochrane, Nick Pope
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache License v2.0
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*/
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class Extractor extends Regex
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{
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/**
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* @var bool
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*/
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protected $extractURLWithoutProtocol = true;
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/**
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* Provides fluent method chaining.
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*
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* @param string $tweet The tweet to be converted.
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*
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* @see __construct()
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*
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* @return Extractor
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*/
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public static function create($tweet = null)
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{
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return new self($tweet);
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}
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/**
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* Reads in a tweet to be parsed and extracts elements from it.
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*
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* Extracts various parts of a tweet including URLs, usernames, hashtags...
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*
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* @param string $tweet The tweet to extract.
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*/
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public function __construct($tweet = null)
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{
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parent::__construct($tweet);
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}
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/**
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* Extracts all parts of a tweet and returns an associative array containing
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* the extracted elements.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The elements in the tweet.
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*/
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public function extract($tweet = null)
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{
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if (is_null($tweet)) {
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$tweet = $this->tweet;
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}
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return [
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'hashtags' => $this->extractHashtags($tweet),
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'urls' => $this->extractURLs($tweet),
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'mentions' => $this->extractMentionedUsernames($tweet),
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'replyto' => $this->extractRepliedUsernames($tweet),
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'hashtags_with_indices' => $this->extractHashtagsWithIndices($tweet),
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'urls_with_indices' => $this->extractURLsWithIndices($tweet),
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'mentions_with_indices' => $this->extractMentionedUsernamesWithIndices($tweet),
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];
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}
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/**
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* Extract URLs, @mentions, lists and #hashtag from a given text/tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array list of extracted entities
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*/
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public function extractEntitiesWithIndices($tweet = null)
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{
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if (is_null($tweet)) {
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$tweet = $this->tweet;
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}
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$entities = [];
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$entities = array_merge($entities, $this->extractURLsWithIndices($tweet));
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$entities = array_merge($entities, $this->extractHashtagsWithIndices($tweet, false));
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$entities = array_merge($entities, $this->extractMentionsOrListsWithIndices($tweet));
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$entities = $this->removeOverlappingEntities($entities);
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return $entities;
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}
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/**
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* Extracts all the hashtags from the tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The hashtag elements in the tweet.
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*/
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public function extractHashtags($tweet = null)
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{
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$hashtagsOnly = [];
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$hashtagsWithIndices = $this->extractHashtagsWithIndices($tweet);
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foreach ($hashtagsWithIndices as $hashtagWithIndex) {
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$hashtagsOnly[] = $hashtagWithIndex['hashtag'];
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}
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return $hashtagsOnly;
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}
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/**
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* Extracts all the cashtags from the tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The cashtag elements in the tweet.
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*/
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public function extractCashtags($tweet = null)
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{
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$cashtagsOnly = [];
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$cashtagsWithIndices = $this->extractCashtagsWithIndices($tweet);
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foreach ($cashtagsWithIndices as $cashtagWithIndex) {
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$cashtagsOnly[] = $cashtagWithIndex['cashtag'];
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}
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return $cashtagsOnly;
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}
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/**
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* Extracts all the URLs from the tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The URL elements in the tweet.
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*/
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public function extractURLs($tweet = null)
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{
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$urlsOnly = [];
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$urlsWithIndices = $this->extractURLsWithIndices($tweet);
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foreach ($urlsWithIndices as $urlWithIndex) {
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$urlsOnly[] = $urlWithIndex['url'];
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}
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return $urlsOnly;
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}
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/**
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* Extract all the usernames from the tweet.
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*
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* A mention is an occurrence of a username anywhere in a tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The usernames elements in the tweet.
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*/
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public function extractMentionedScreennames($tweet = null)
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{
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$usernamesOnly = [];
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$mentionsWithIndices = $this->extractMentionsOrListsWithIndices($tweet);
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foreach ($mentionsWithIndices as $mentionWithIndex) {
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$screen_name = mb_strtolower($mentionWithIndex['screen_name']);
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if (empty($screen_name) or in_array($screen_name, $usernamesOnly)) {
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continue;
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}
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$usernamesOnly[] = $screen_name;
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}
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return $usernamesOnly;
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}
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/**
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* Extract all the usernames from the tweet.
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*
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* A mention is an occurrence of a username anywhere in a tweet.
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*
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* @return array The usernames elements in the tweet.
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*
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* @deprecated since version 1.1.0
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*/
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public function extractMentionedUsernames($tweet)
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{
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$this->tweet = $tweet;
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return $this->extractMentionedScreennames($tweet);
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}
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/**
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* Extract all the usernames replied to from the tweet.
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*
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* A reply is an occurrence of a username at the beginning of a tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The usernames replied to in a tweet.
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*/
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public function extractReplyScreenname($tweet = null)
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{
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if (is_null($tweet)) {
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$tweet = $this->tweet;
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}
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$matched = preg_match(self::$patterns['valid_reply'], $tweet, $matches);
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// Check username ending in
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if ($matched && preg_match(self::$patterns['end_mention_match'], $matches[2])) {
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$matched = false;
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}
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return $matched ? $matches[1] : null;
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}
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/**
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* Extract all the usernames replied to from the tweet.
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*
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* A reply is an occurrence of a username at the beginning of a tweet.
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*
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* @return array The usernames replied to in a tweet.
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*
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* @deprecated since version 1.1.0
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*/
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public function extractRepliedUsernames()
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{
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return $this->extractReplyScreenname();
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}
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/**
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* Extracts all the hashtags and the indices they occur at from the tweet.
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*
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* @param string $tweet The tweet to extract.
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* @param bool $checkUrlOverlap if true, check if extracted hashtags overlap URLs and remove overlapping ones
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*
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* @return array The hashtag elements in the tweet.
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*/
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public function extractHashtagsWithIndices($tweet = null, $checkUrlOverlap = true)
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{
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if (is_null($tweet)) {
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$tweet = $this->tweet;
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}
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if (!preg_match('/[#＃]/iu', $tweet)) {
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return [];
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}
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preg_match_all(self::$patterns['valid_hashtag'], $tweet, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
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$tags = [];
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foreach ($matches as $match) {
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list($all, $before, $hash, $hashtag, $outer) = array_pad($match, 3, ['', 0]);
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$start_position = $hash[1] > 0 ? StringUtils::strlen(substr($tweet, 0, $hash[1])) : $hash[1];
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$end_position = $start_position + StringUtils::strlen($hash[0].$hashtag[0]);
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if (preg_match(self::$patterns['end_hashtag_match'], $outer[0])) {
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continue;
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}
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$tags[] = [
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'hashtag' => $hashtag[0],
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'indices' => [$start_position, $end_position],
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];
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}
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if (!$checkUrlOverlap) {
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return $tags;
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}
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// check url overlap
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$urls = $this->extractURLsWithIndices($tweet);
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$entities = $this->removeOverlappingEntities(array_merge($tags, $urls));
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$validTags = [];
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foreach ($entities as $entity) {
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if (empty($entity['hashtag'])) {
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continue;
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}
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$validTags[] = $entity;
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}
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return $validTags;
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}
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/**
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* Extracts all the cashtags and the indices they occur at from the tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The cashtag elements in the tweet.
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*/
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public function extractCashtagsWithIndices($tweet = null)
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{
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}
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/**
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* Extracts all the URLs and the indices they occur at from the tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The URLs elements in the tweet.
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*/
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public function extractURLsWithIndices($tweet = null)
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{
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if (is_null($tweet)) {
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$tweet = $this->tweet;
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}
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$needle = $this->extractURLWithoutProtocol() ? '.' : ':';
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if (strpos($tweet, $needle) === false) {
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return [];
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}
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$urls = [];
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preg_match_all(self::$patterns['valid_url'], $tweet, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
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foreach ($matches as $match) {
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list($all, $before, $url, $protocol, $domain, $port, $path, $query) = array_pad($match, 8, ['']);
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$start_position = $url[1] > 0 ? StringUtils::strlen(substr($tweet, 0, $url[1])) : $url[1];
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$end_position = $start_position + StringUtils::strlen($url[0]);
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$all = $all[0];
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$before = $before[0];
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$url = $url[0];
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$protocol = $protocol[0];
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$domain = $domain[0];
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$port = $port[0];
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$path = $path[0];
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$query = $query[0];
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// If protocol is missing and domain contains non-ASCII characters,
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// extract ASCII-only domains.
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if (empty($protocol)) {
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if (!$this->extractURLWithoutProtocol || preg_match(self::$patterns['invalid_url_without_protocol_preceding_chars'], $before)) {
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continue;
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}
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$last_url = null;
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$ascii_end_position = 0;
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if (preg_match(self::$patterns['valid_ascii_domain'], $domain, $asciiDomain)) {
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$asciiDomain[0] = preg_replace('/'.preg_quote($domain, '/').'/u', $asciiDomain[0], $url);
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$ascii_start_position = StringUtils::strpos($domain, $asciiDomain[0], $ascii_end_position);
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$ascii_end_position = $ascii_start_position + StringUtils::strlen($asciiDomain[0]);
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$last_url = [
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'url' => $asciiDomain[0],
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'indices' => [$start_position + $ascii_start_position, $start_position + $ascii_end_position],
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];
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if (!empty($path)
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|| preg_match(self::$patterns['valid_special_short_domain'], $asciiDomain[0])
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|| !preg_match(self::$patterns['invalid_short_domain'], $asciiDomain[0])) {
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$urls[] = $last_url;
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}
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}
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// no ASCII-only domain found. Skip the entire URL
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if (empty($last_url)) {
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continue;
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}
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// $last_url only contains domain. Need to add path and query if they exist.
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if (!empty($path)) {
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// last_url was not added. Add it to urls here.
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$last_url['url'] = preg_replace('/'.preg_quote($domain, '/').'/u', $last_url['url'], $url);
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$last_url['indices'][1] = $end_position;
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}
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} else {
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// In the case of t.co URLs, don't allow additional path characters
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if (preg_match(self::$patterns['valid_tco_url'], $url, $tcoUrlMatches)) {
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$url = $tcoUrlMatches[0];
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$end_position = $start_position + StringUtils::strlen($url);
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}
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$urls[] = [
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'url' => $url,
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'indices' => [$start_position, $end_position],
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];
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}
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}
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return $urls;
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}
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/**
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* Extracts all the usernames and the indices they occur at from the tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The username elements in the tweet.
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*/
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public function extractMentionedScreennamesWithIndices($tweet = null)
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{
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if (is_null($tweet)) {
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$tweet = $this->tweet;
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}
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$usernamesOnly = [];
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$mentions = $this->extractMentionsOrListsWithIndices($tweet);
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foreach ($mentions as $mention) {
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if (isset($mention['list_slug'])) {
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unset($mention['list_slug']);
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}
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$usernamesOnly[] = $mention;
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}
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return $usernamesOnly;
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}
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/**
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* Extracts all the usernames and the indices they occur at from the tweet.
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*
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* @return array The username elements in the tweet.
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*
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* @deprecated since version 1.1.0
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*/
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public function extractMentionedUsernamesWithIndices()
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{
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return $this->extractMentionedScreennamesWithIndices();
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}
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/**
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* Extracts all the usernames and the indices they occur at from the tweet.
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*
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* @param string $tweet The tweet to extract.
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*
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* @return array The username elements in the tweet.
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*/
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public function extractMentionsOrListsWithIndices($tweet = null)
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{
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if (is_null($tweet)) {
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$tweet = $this->tweet;
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}
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if (!preg_match('/[@＠]/iu', $tweet)) {
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return [];
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}
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preg_match_all(self::$patterns['valid_mentions_or_lists'], $tweet, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE);
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$results = [];
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foreach ($matches as $match) {
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list($all, $before, $at, $username, $list_slug, $outer) = array_pad($match, 6, ['', 0]);
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$start_position = $at[1] > 0 ? StringUtils::strlen(substr($tweet, 0, $at[1])) : $at[1];
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$end_position = $start_position + StringUtils::strlen($at[0]) + StringUtils::strlen($username[0]);
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$entity = [
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'screen_name' => $username[0],
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'list_slug' => $list_slug[0],
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'indices' => [$start_position, $end_position],
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];
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if (preg_match(self::$patterns['end_mention_match'], $outer[0])) {
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continue;
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}
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if (!empty($list_slug[0])) {
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$entity['indices'][1] = $end_position + StringUtils::strlen($list_slug[0]);
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}
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$results[] = $entity;
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}
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return $results;
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}
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/**
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* Extracts all the usernames and the indices they occur at from the tweet.
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*
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* @return array The username elements in the tweet.
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*
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* @deprecated since version 1.1.0
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*/
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public function extractMentionedUsernamesOrListsWithIndices()
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{
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return $this->extractMentionsOrListsWithIndices();
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}
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/**
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* setter/getter for extractURLWithoutProtocol.
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*
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* @param bool $flag
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*
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* @return Extractor
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*/
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public function extractURLWithoutProtocol($flag = null)
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{
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if (is_null($flag)) {
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return $this->extractURLWithoutProtocol;
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}
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$this->extractURLWithoutProtocol = (bool) $flag;
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return $this;
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}
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/**
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* Remove overlapping entities.
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* This returns a new array with no overlapping entities.
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*
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* @param array $entities
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*
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* @return array
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*/
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public function removeOverlappingEntities($entities)
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{
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$result = [];
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usort($entities, [$this, 'sortEntites']);
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$prev = null;
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foreach ($entities as $entity) {
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if (isset($prev) && $entity['indices'][0] < $prev['indices'][1]) {
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continue;
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}
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$prev = $entity;
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$result[] = $entity;
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}
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return $result;
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}
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/**
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* sort by entity start index.
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*
|
||
* @param array $a
|
||
* @param array $b
|
||
*
|
||
* @return int
|
||
*/
|
||
protected function sortEntites($a, $b)
|
||
{
|
||
if ($a['indices'][0] == $b['indices'][0]) {
|
||
return 0;
|
||
}
|
||
|
||
return ($a['indices'][0] < $b['indices'][0]) ? -1 : 1;
|
||
}
|
||
}
|