vanderlee / php-sentence

classes/Sentence.php

Indentation +463 added lines, -463 removed lines

@@ -15,468 +15,468 @@
 class Sentence
 {
 
-    /**
-     * Specify this flag with the split method to trim whitespace.
-     */
-    const SPLIT_TRIM = 0x1;
-
-    /**
-     * List of characters used to terminate sentences.
-     *
-     * @var string[]
-     */
-    private $terminals = array('.', '!', '?');
-
-    /**
-     * List of characters used for abbreviations.
-     *
-     * @var string[]
-     */
-    private $abbreviators = array('.');
-
-    /**
-     * Multibyte safe version of standard trim() function.
-     *
-     * @param string $string
-     * @return string
-     */
-    private static function mbTrim($string)
-    {
-        return mb_ereg_replace('^\s*([\s\S]*?)\s*$', '\1', $string);
-    }
-
-    /**
-     * A cross between mb_split and preg_split, adding the preg_split flags
-     * to mb_split.
-     *
-     * @param string $pattern
-     * @param string $string
-     * @param int $limit
-     * @param int $flags
-     * @return array
-     */
-    private static function mbSplit($pattern, $string, $limit = -1, $flags = 0)
-    {
-        $split_no_empty = (bool)($flags & PREG_SPLIT_NO_EMPTY);
-        $offset_capture = (bool)($flags & PREG_SPLIT_OFFSET_CAPTURE);
-        $delim_capture = (bool)($flags & PREG_SPLIT_DELIM_CAPTURE);
-
-        $strlen = strlen($string); // bytes!
-        mb_ereg_search_init($string);
-
-        $lengths = array();
-        $position = 0;
-        while (($array = mb_ereg_search_pos($pattern, '')) !== false) {
-            // capture split
-            $lengths[] = array($array[0] - $position, false, null);
-
-            // move position
-            $position = $array[0] + $array[1];
-
-            // capture delimiter
-            $regs = mb_ereg_search_getregs();
-            $lengths[] = array($array[1], true, isset($regs[1]) && $regs[1]);
-
-            // Continue on?
-            if ($position >= $strlen) {
-                break;
-            }
-        }
-
-        // Add last bit, if not ending with split
-        $lengths[] = array($strlen - $position, false, null);
-
-        // Substrings
-        $parts = array();
-        $position = 0;
-        $count = 1;
-        foreach ($lengths as $length) {
-            $split_empty = $length[0] || !$split_no_empty;
-            $is_delimiter = $length[1];
-            $is_captured = $length[2];
-
-            if ($limit > 0
-                && !$is_delimiter
-                && $split_empty
-                && ++$count > $limit) {
-                if ($length[0] > 0
-                    || $split_empty) {
-                    $parts[] = $offset_capture
-                        ? array(mb_strcut($string, $position), $position)
-                        : mb_strcut($string, $position);
-                }
-                break;
-            } elseif ((!$is_delimiter
-                    || ($delim_capture
-                        && $is_captured))
-                && ($length[0]
-                    || $split_empty)) {
-                $parts[] = $offset_capture
-                    ? array(mb_strcut($string, $position, $length[0]), $position)
-                    : mb_strcut($string, $position, $length[0]);
-            }
-
-            $position += $length[0];
-        }
-
-        return $parts;
-    }
-
-    /**
-     * Breaks a piece of text into lines by linebreak.
-     * Eats up any linebreak characters as if one.
-     *
-     * Multibyte safe
-     *
-     * @param string $text
-     * @return string[]
-     */
-    private static function linebreakSplit($text)
-    {
-        $lines = array();
-        $line = '';
-
-        foreach (self::mbSplit('([\r\n]+)', $text, -1, PREG_SPLIT_DELIM_CAPTURE) as $part) {
-            $line .= $part;
-            if (self::mbTrim($part) === '') {
-                $lines[] = $line;
-                $line = '';
-            }
-        }
-        $lines[] = $line;
-
-        return $lines;
-    }
-
-    /**
-     * Replace
-     *
-     * @staticvar array $chr_map
-     * @param string $string
-     * @return string
-     */
-    private static function cleanUnicode($string)
-    {
-        //https://stackoverflow.com/questions/20025030/convert-all-types-of-smart-quotes-with-php
-        static $character_map = array(
-            // Windows codepage 1252
-            "\xC2\x82" => "'", // U+0082⇒U+201A single low-9 quotation mark
-            "\xC2\x84" => '"', // U+0084⇒U+201E double low-9 quotation mark
-            "\xC2\x8B" => "'", // U+008B⇒U+2039 single left-pointing angle quotation mark
-            "\xC2\x91" => "'", // U+0091⇒U+2018 left single quotation mark
-            "\xC2\x92" => "'", // U+0092⇒U+2019 right single quotation mark
-            "\xC2\x93" => '"', // U+0093⇒U+201C left double quotation mark
-            "\xC2\x94" => '"', // U+0094⇒U+201D right double quotation mark
-            "\xC2\x9B" => "'", // U+009B⇒U+203A single right-pointing angle quotation mark
-            // Regular Unicode     // U+0022 quotation mark (")
-            // U+0027 apostrophe     (')
-            "\xC2\xAB" => '"', // U+00AB left-pointing double angle quotation mark
-            "\xC2\xBB" => '"', // U+00BB right-pointing double angle quotation mark
-            "\xE2\x80\x98" => "'", // U+2018 left single quotation mark
-            "\xE2\x80\x99" => "'", // U+2019 right single quotation mark
-            "\xE2\x80\x9A" => "'", // U+201A single low-9 quotation mark
-            "\xE2\x80\x9B" => "'", // U+201B single high-reversed-9 quotation mark
-            "\xE2\x80\x9C" => '"', // U+201C left double quotation mark
-            "\xE2\x80\x9D" => '"', // U+201D right double quotation mark
-            "\xE2\x80\x9E" => '"', // U+201E double low-9 quotation mark
-            "\xE2\x80\x9F" => '"', // U+201F double high-reversed-9 quotation mark
-            "\xE2\x80\xB9" => "'", // U+2039 single left-pointing angle quotation mark
-            "\xE2\x80\xBA" => "'", // U+203A single right-pointing angle quotation mark
-        );
-
-        $character = array_keys($character_map); // but: for efficiency you should
-        $replace = array_values($character_map); // pre-calculate these two arrays
-        return str_replace($character, $replace, html_entity_decode($string, ENT_QUOTES, "UTF-8"));
-    }
-
-    /**
-     * Splits an array of lines by (consecutive sequences of)
-     * terminals, keeping terminals.
-     *
-     * Multibyte safe (atleast for UTF-8)
-     *
-     * For example:
-     *    "There ... is. More!"
-     *        ... becomes ...
-     *    [ "There ", "...", " is", ".", " More", "!" ]
-     *
-     * @param string $line
-     * @return string[]
-     */
-    private function punctuationSplit($line)
-    {
-        $parts = array();
-
-        $chars = preg_split('//u', $line, -1, PREG_SPLIT_NO_EMPTY); // This is UTF8 multibyte safe!
-        $is_terminal = in_array($chars[0], $this->terminals);
-
-        $part = '';
-        foreach ($chars as $index => $char) {
-            if (in_array($char, $this->terminals) !== $is_terminal) {
-                $parts[] = $part;
-                $part = '';
-                $is_terminal = !$is_terminal;
-            }
-            $part .= $char;
-        }
-
-        if (!empty($part)) {
-            $parts[] = $part;
-        }
-
-        return $parts;
-    }
-
-    /**
-     * Appends each terminal item after it's preceding
-     * non-terminals.
-     *
-     * Multibyte safe (atleast for UTF-8)
-     *
-     * For example:
-     *    [ "There ", "...", " is", ".", " More", "!" ]
-     *        ... becomes ...
-     *    [ "There ... is.", "More!" ]
-     *
-     * @param string[] $punctuations
-     * @return string[]
-     */
-    private function punctuationMerge($punctuations)
-    {
-        $definite_terminals = array_diff($this->terminals, $this->abbreviators);
-
-        $merges = array();
-        $merge = '';
-
-        foreach ($punctuations as $punctuation) {
-            if ($punctuation !== '') {
-                $merge .= $punctuation;
-                if (mb_strlen($punctuation) === 1
-                    && in_array($punctuation, $this->terminals)) {
-                    $merges[] = $merge;
-                    $merge = '';
-                } else {
-                    foreach ($definite_terminals as $terminal) {
-                        if (mb_strpos($punctuation, $terminal) !== false) {
-                            $merges[] = $merge;
-                            $merge = '';
-                            break;
-                        }
-                    }
-                }
-            }
-        }
-        if (!empty($merge)) {
-            $merges[] = $merge;
-        }
-
-        return $merges;
-    }
-
-    /**
-     * Looks for capitalized abbreviations & includes them with the following fragment.
-     *
-     * For example:
-     *    [ "Last week, former director of the F.B.I. James B. Comey was fired. Mr. Comey was not available for comment." ]
-     *        ... becomes ...
-     *    [ "Last week, former director of the F.B.I. James B. Comey was fired." ]
-     *  [ "Mr. Comey was not available for comment." ]
-     *
-     * @param string[] $fragments
-     * @return string[]
-     */
-    private function abbreviationMerge($fragments)
-    {
-        $return_fragment = array();
-
-        $previous_string = '';
-        $previous_is_abbreviation = false;
-        $i = 0;
-
-        foreach ($fragments as $fragment) {
-            $current_string = $fragment;
-            $words = mb_split('\s+', self::mbTrim($fragment));
-
-            $word_count = count($words);
-
-            // if last word of fragment starts with a Capital, ends in "." & has less than 3 characters, trigger "is abbreviation"
-            $last_word = trim($words[$word_count - 1]);
-            $last_is_capital = preg_match('#^\p{Lu}#u', $last_word);
-            $last_is_abbreviation = substr(trim($fragment), -1) === '.';
-            $is_abbreviation = $last_is_capital > 0
-                && $last_is_abbreviation > 0
-                && mb_strlen($last_word) <= 3;
-
-            // merge previous fragment with this
-            if ($previous_is_abbreviation === true) {
-                $current_string = $previous_string . $current_string;
-            }
-            $return_fragment[$i] = $current_string;
-
-            $previous_is_abbreviation = $is_abbreviation;
-            $previous_string = $current_string;
-            // only increment if this isn't an abbreviation
-            if ($is_abbreviation === false) {
-                $i++;
-            }
-        }
-        return $return_fragment;
-    }
-
-    /**
-     * Merges any part starting with a closing parenthesis ')' to the previous
-     * part.
-     *
-     * @param string[] $parts
-     * @return string[]
-     */
-    private function parenthesesMerge($parts)
-    {
-        $subsentences = array();
-
-        foreach ($parts as $part) {
-            if ($part[0] === ')') {
-                $subsentences[count($subsentences) - 1] .= $part;
-            } else {
-                $subsentences[] = $part;
-            }
-        }
-
-        return $subsentences;
-    }
-
-    /**
-     * Looks for closing quotes to include them with the previous statement.
-     * "That was very interesting," he said.
-     * "That was very interesting."
-     *
-     * @param string[] $statements
-     * @return string[]
-     */
-    private function closeQuotesMerge($statements)
-    {
-        $i = 0;
-        $previous_statement = "";
-        $return = array();
-        foreach ($statements as $statement) {
-            // detect end quote - if the entire string is a quotation mark, or it's [quote, space, lowercase]
-            if (trim($statement) === '"'
-                || trim($statement) === "'"
-                || (
-                    (substr($statement, 0, 1) === '"'
-                        || substr($statement, 0, 1) === "'")
-                    && substr($statement, 1, 1) === ' '
-                    && ctype_lower(substr($statement, 2, 1)) === true
-                )
-            ) {
-                $statement = $previous_statement . $statement;
-            } else {
-                $i++;
-            }
-
-            $return[$i] = $statement;
-            $previous_statement = $statement;
-        }
-
-        return $return;
-    }
-
-    /**
-     * Merges items into larger sentences.
-     * Multibyte safe
-     *
-     * @param string[] $shorts
-     * @return string[]
-     */
-    private function sentenceMerge($shorts)
-    {
-        $non_abbreviating_terminals = array_diff($this->terminals, $this->abbreviators);
-
-        $sentences = array();
-
-        $sentence = '';
-        $has_words = false;
-        $previous_word_ending = null;
-        foreach ($shorts as $short) {
-            $word_count = count(mb_split('\s+', self::mbTrim($short)));
-            $after_non_abbreviating_terminal = in_array($previous_word_ending, $non_abbreviating_terminals);
-
-            if ($after_non_abbreviating_terminal
-                || ($has_words && $word_count > 1)) {
-                $sentences[] = $sentence;
-                $sentence = '';
-                $has_words = $word_count > 1;
-            } else {
-                $has_words = ($has_words
-                    || $word_count > 1);
-            }
-
-            $sentence .= $short;
-            $previous_word_ending = mb_substr($short, -1);
-        }
-        if (!empty($sentence)) {
-            $sentences[] = $sentence;
-        }
-
-        return $sentences;
-    }
-
-    /**
-     * Return the sentences sentences detected in the provided text.
-     * Set the Sentence::SPLIT_TRIM flag to trim whitespace.
-     * @param string $text
-     * @param integer $flags
-     * @return string[]
-     */
-    public function split($text, $flags = 0)
-    {
-        $sentences = array();
-
-        // clean funny quotes
-        $text = self::cleanUnicode($text);
-
-        // Split
-        foreach (self::linebreakSplit($text) as $line) {
-            if (self::mbTrim($line) !== '') {
-                $punctuations = $this->punctuationSplit($line);
-                $parentheses = $this->parenthesesMerge($punctuations); // also works after punctuationMerge or abbreviationMerge
-                $merges = $this->punctuationMerge($parentheses);
-                $shorts = $this->abbreviationMerge($merges);
-                $quotes = $this->closeQuotesMerge($shorts);
-                $sentences = array_merge($sentences, $this->sentenceMerge($quotes));
-            }
-        }
-
-        // Post process
-        if ($flags & self::SPLIT_TRIM) {
-            return self::trimSentences($sentences);
-        }
-
-        return $sentences;
-    }
-
-    /**
-     * Multibyte trim each string in an array.
-     * @param string[] $sentences
-     * @return string[]
-     */
-    private static function trimSentences($sentences)
-    {
-        $trimmed = array();
-        foreach ($sentences as $sentence) {
-            $trimmed[] = self::mbTrim($sentence);
-        }
-        return $trimmed;
-    }
-
-    /**
-     * Return the number of sentences detected in the provided text.
-     * @param string $text
-     * @return integer
-     */
-    public function count($text)
-    {
-        return count($this->split($text));
-    }
+	/**
+	 * Specify this flag with the split method to trim whitespace.
+	 */
+	const SPLIT_TRIM = 0x1;
+
+	/**
+	 * List of characters used to terminate sentences.
+	 *
+	 * @var string[]
+	 */
+	private $terminals = array('.', '!', '?');
+
+	/**
+	 * List of characters used for abbreviations.
+	 *
+	 * @var string[]
+	 */
+	private $abbreviators = array('.');
+
+	/**
+	 * Multibyte safe version of standard trim() function.
+	 *
+	 * @param string $string
+	 * @return string
+	 */
+	private static function mbTrim($string)
+	{
+		return mb_ereg_replace('^\s*([\s\S]*?)\s*$', '\1', $string);
+	}
+
+	/**
+	 * A cross between mb_split and preg_split, adding the preg_split flags
+	 * to mb_split.
+	 *
+	 * @param string $pattern
+	 * @param string $string
+	 * @param int $limit
+	 * @param int $flags
+	 * @return array
+	 */
+	private static function mbSplit($pattern, $string, $limit = -1, $flags = 0)
+	{
+		$split_no_empty = (bool)($flags & PREG_SPLIT_NO_EMPTY);
+		$offset_capture = (bool)($flags & PREG_SPLIT_OFFSET_CAPTURE);
+		$delim_capture = (bool)($flags & PREG_SPLIT_DELIM_CAPTURE);
+
+		$strlen = strlen($string); // bytes!
+		mb_ereg_search_init($string);
+
+		$lengths = array();
+		$position = 0;
+		while (($array = mb_ereg_search_pos($pattern, '')) !== false) {
+			// capture split
+			$lengths[] = array($array[0] - $position, false, null);
+
+			// move position
+			$position = $array[0] + $array[1];
+
+			// capture delimiter
+			$regs = mb_ereg_search_getregs();
+			$lengths[] = array($array[1], true, isset($regs[1]) && $regs[1]);
+
+			// Continue on?
+			if ($position >= $strlen) {
+				break;
+			}
+		}
+
+		// Add last bit, if not ending with split
+		$lengths[] = array($strlen - $position, false, null);
+
+		// Substrings
+		$parts = array();
+		$position = 0;
+		$count = 1;
+		foreach ($lengths as $length) {
+			$split_empty = $length[0] || !$split_no_empty;
+			$is_delimiter = $length[1];
+			$is_captured = $length[2];
+
+			if ($limit > 0
+				&& !$is_delimiter
+				&& $split_empty
+				&& ++$count > $limit) {
+				if ($length[0] > 0
+					|| $split_empty) {
+					$parts[] = $offset_capture
+						? array(mb_strcut($string, $position), $position)
+						: mb_strcut($string, $position);
+				}
+				break;
+			} elseif ((!$is_delimiter
+					|| ($delim_capture
+						&& $is_captured))
+				&& ($length[0]
+					|| $split_empty)) {
+				$parts[] = $offset_capture
+					? array(mb_strcut($string, $position, $length[0]), $position)
+					: mb_strcut($string, $position, $length[0]);
+			}
+
+			$position += $length[0];
+		}
+
+		return $parts;
+	}
+
+	/**
+	 * Breaks a piece of text into lines by linebreak.
+	 * Eats up any linebreak characters as if one.
+	 *
+	 * Multibyte safe
+	 *
+	 * @param string $text
+	 * @return string[]
+	 */
+	private static function linebreakSplit($text)
+	{
+		$lines = array();
+		$line = '';
+
+		foreach (self::mbSplit('([\r\n]+)', $text, -1, PREG_SPLIT_DELIM_CAPTURE) as $part) {
+			$line .= $part;
+			if (self::mbTrim($part) === '') {
+				$lines[] = $line;
+				$line = '';
+			}
+		}
+		$lines[] = $line;
+
+		return $lines;
+	}
+
+	/**
+	 * Replace
+	 *
+	 * @staticvar array $chr_map
+	 * @param string $string
+	 * @return string
+	 */
+	private static function cleanUnicode($string)
+	{
+		//https://stackoverflow.com/questions/20025030/convert-all-types-of-smart-quotes-with-php
+		static $character_map = array(
+			// Windows codepage 1252
+			"\xC2\x82" => "'", // U+0082⇒U+201A single low-9 quotation mark
+			"\xC2\x84" => '"', // U+0084⇒U+201E double low-9 quotation mark
+			"\xC2\x8B" => "'", // U+008B⇒U+2039 single left-pointing angle quotation mark
+			"\xC2\x91" => "'", // U+0091⇒U+2018 left single quotation mark
+			"\xC2\x92" => "'", // U+0092⇒U+2019 right single quotation mark
+			"\xC2\x93" => '"', // U+0093⇒U+201C left double quotation mark
+			"\xC2\x94" => '"', // U+0094⇒U+201D right double quotation mark
+			"\xC2\x9B" => "'", // U+009B⇒U+203A single right-pointing angle quotation mark
+			// Regular Unicode     // U+0022 quotation mark (")
+			// U+0027 apostrophe     (')
+			"\xC2\xAB" => '"', // U+00AB left-pointing double angle quotation mark
+			"\xC2\xBB" => '"', // U+00BB right-pointing double angle quotation mark
+			"\xE2\x80\x98" => "'", // U+2018 left single quotation mark
+			"\xE2\x80\x99" => "'", // U+2019 right single quotation mark
+			"\xE2\x80\x9A" => "'", // U+201A single low-9 quotation mark
+			"\xE2\x80\x9B" => "'", // U+201B single high-reversed-9 quotation mark
+			"\xE2\x80\x9C" => '"', // U+201C left double quotation mark
+			"\xE2\x80\x9D" => '"', // U+201D right double quotation mark
+			"\xE2\x80\x9E" => '"', // U+201E double low-9 quotation mark
+			"\xE2\x80\x9F" => '"', // U+201F double high-reversed-9 quotation mark
+			"\xE2\x80\xB9" => "'", // U+2039 single left-pointing angle quotation mark
+			"\xE2\x80\xBA" => "'", // U+203A single right-pointing angle quotation mark
+		);
+
+		$character = array_keys($character_map); // but: for efficiency you should
+		$replace = array_values($character_map); // pre-calculate these two arrays
+		return str_replace($character, $replace, html_entity_decode($string, ENT_QUOTES, "UTF-8"));
+	}
+
+	/**
+	 * Splits an array of lines by (consecutive sequences of)
+	 * terminals, keeping terminals.
+	 *
+	 * Multibyte safe (atleast for UTF-8)
+	 *
+	 * For example:
+	 *    "There ... is. More!"
+	 *        ... becomes ...
+	 *    [ "There ", "...", " is", ".", " More", "!" ]
+	 *
+	 * @param string $line
+	 * @return string[]
+	 */
+	private function punctuationSplit($line)
+	{
+		$parts = array();
+
+		$chars = preg_split('//u', $line, -1, PREG_SPLIT_NO_EMPTY); // This is UTF8 multibyte safe!
+		$is_terminal = in_array($chars[0], $this->terminals);
+
+		$part = '';
+		foreach ($chars as $index => $char) {
+			if (in_array($char, $this->terminals) !== $is_terminal) {
+				$parts[] = $part;
+				$part = '';
+				$is_terminal = !$is_terminal;
+			}
+			$part .= $char;
+		}
+
+		if (!empty($part)) {
+			$parts[] = $part;
+		}
+
+		return $parts;
+	}
+
+	/**
+	 * Appends each terminal item after it's preceding
+	 * non-terminals.
+	 *
+	 * Multibyte safe (atleast for UTF-8)
+	 *
+	 * For example:
+	 *    [ "There ", "...", " is", ".", " More", "!" ]
+	 *        ... becomes ...
+	 *    [ "There ... is.", "More!" ]
+	 *
+	 * @param string[] $punctuations
+	 * @return string[]
+	 */
+	private function punctuationMerge($punctuations)
+	{
+		$definite_terminals = array_diff($this->terminals, $this->abbreviators);
+
+		$merges = array();
+		$merge = '';
+
+		foreach ($punctuations as $punctuation) {
+			if ($punctuation !== '') {
+				$merge .= $punctuation;
+				if (mb_strlen($punctuation) === 1
+					&& in_array($punctuation, $this->terminals)) {
+					$merges[] = $merge;
+					$merge = '';
+				} else {
+					foreach ($definite_terminals as $terminal) {
+						if (mb_strpos($punctuation, $terminal) !== false) {
+							$merges[] = $merge;
+							$merge = '';
+							break;
+						}
+					}
+				}
+			}
+		}
+		if (!empty($merge)) {
+			$merges[] = $merge;
+		}
+
+		return $merges;
+	}
+
+	/**
+	 * Looks for capitalized abbreviations & includes them with the following fragment.
+	 *
+	 * For example:
+	 *    [ "Last week, former director of the F.B.I. James B. Comey was fired. Mr. Comey was not available for comment." ]
+	 *        ... becomes ...
+	 *    [ "Last week, former director of the F.B.I. James B. Comey was fired." ]
+	 *  [ "Mr. Comey was not available for comment." ]
+	 *
+	 * @param string[] $fragments
+	 * @return string[]
+	 */
+	private function abbreviationMerge($fragments)
+	{
+		$return_fragment = array();
+
+		$previous_string = '';
+		$previous_is_abbreviation = false;
+		$i = 0;
+
+		foreach ($fragments as $fragment) {
+			$current_string = $fragment;
+			$words = mb_split('\s+', self::mbTrim($fragment));
+
+			$word_count = count($words);
+
+			// if last word of fragment starts with a Capital, ends in "." & has less than 3 characters, trigger "is abbreviation"
+			$last_word = trim($words[$word_count - 1]);
+			$last_is_capital = preg_match('#^\p{Lu}#u', $last_word);
+			$last_is_abbreviation = substr(trim($fragment), -1) === '.';
+			$is_abbreviation = $last_is_capital > 0
+				&& $last_is_abbreviation > 0
+				&& mb_strlen($last_word) <= 3;
+
+			// merge previous fragment with this
+			if ($previous_is_abbreviation === true) {
+				$current_string = $previous_string . $current_string;
+			}
+			$return_fragment[$i] = $current_string;
+
+			$previous_is_abbreviation = $is_abbreviation;
+			$previous_string = $current_string;
+			// only increment if this isn't an abbreviation
+			if ($is_abbreviation === false) {
+				$i++;
+			}
+		}
+		return $return_fragment;
+	}
+
+	/**
+	 * Merges any part starting with a closing parenthesis ')' to the previous
+	 * part.
+	 *
+	 * @param string[] $parts
+	 * @return string[]
+	 */
+	private function parenthesesMerge($parts)
+	{
+		$subsentences = array();
+
+		foreach ($parts as $part) {
+			if ($part[0] === ')') {
+				$subsentences[count($subsentences) - 1] .= $part;
+			} else {
+				$subsentences[] = $part;
+			}
+		}
+
+		return $subsentences;
+	}
+
+	/**
+	 * Looks for closing quotes to include them with the previous statement.
+	 * "That was very interesting," he said.
+	 * "That was very interesting."
+	 *
+	 * @param string[] $statements
+	 * @return string[]
+	 */
+	private function closeQuotesMerge($statements)
+	{
+		$i = 0;
+		$previous_statement = "";
+		$return = array();
+		foreach ($statements as $statement) {
+			// detect end quote - if the entire string is a quotation mark, or it's [quote, space, lowercase]
+			if (trim($statement) === '"'
+				|| trim($statement) === "'"
+				|| (
+					(substr($statement, 0, 1) === '"'
+						|| substr($statement, 0, 1) === "'")
+					&& substr($statement, 1, 1) === ' '
+					&& ctype_lower(substr($statement, 2, 1)) === true
+				)
+			) {
+				$statement = $previous_statement . $statement;
+			} else {
+				$i++;
+			}
+
+			$return[$i] = $statement;
+			$previous_statement = $statement;
+		}
+
+		return $return;
+	}
+
+	/**
+	 * Merges items into larger sentences.
+	 * Multibyte safe
+	 *
+	 * @param string[] $shorts
+	 * @return string[]
+	 */
+	private function sentenceMerge($shorts)
+	{
+		$non_abbreviating_terminals = array_diff($this->terminals, $this->abbreviators);
+
+		$sentences = array();
+
+		$sentence = '';
+		$has_words = false;
+		$previous_word_ending = null;
+		foreach ($shorts as $short) {
+			$word_count = count(mb_split('\s+', self::mbTrim($short)));
+			$after_non_abbreviating_terminal = in_array($previous_word_ending, $non_abbreviating_terminals);
+
+			if ($after_non_abbreviating_terminal
+				|| ($has_words && $word_count > 1)) {
+				$sentences[] = $sentence;
+				$sentence = '';
+				$has_words = $word_count > 1;
+			} else {
+				$has_words = ($has_words
+					|| $word_count > 1);
+			}
+
+			$sentence .= $short;
+			$previous_word_ending = mb_substr($short, -1);
+		}
+		if (!empty($sentence)) {
+			$sentences[] = $sentence;
+		}
+
+		return $sentences;
+	}
+
+	/**
+	 * Return the sentences sentences detected in the provided text.
+	 * Set the Sentence::SPLIT_TRIM flag to trim whitespace.
+	 * @param string $text
+	 * @param integer $flags
+	 * @return string[]
+	 */
+	public function split($text, $flags = 0)
+	{
+		$sentences = array();
+
+		// clean funny quotes
+		$text = self::cleanUnicode($text);
+
+		// Split
+		foreach (self::linebreakSplit($text) as $line) {
+			if (self::mbTrim($line) !== '') {
+				$punctuations = $this->punctuationSplit($line);
+				$parentheses = $this->parenthesesMerge($punctuations); // also works after punctuationMerge or abbreviationMerge
+				$merges = $this->punctuationMerge($parentheses);
+				$shorts = $this->abbreviationMerge($merges);
+				$quotes = $this->closeQuotesMerge($shorts);
+				$sentences = array_merge($sentences, $this->sentenceMerge($quotes));
+			}
+		}
+
+		// Post process
+		if ($flags & self::SPLIT_TRIM) {
+			return self::trimSentences($sentences);
+		}
+
+		return $sentences;
+	}
+
+	/**
+	 * Multibyte trim each string in an array.
+	 * @param string[] $sentences
+	 * @return string[]
+	 */
+	private static function trimSentences($sentences)
+	{
+		$trimmed = array();
+		foreach ($sentences as $sentence) {
+			$trimmed[] = self::mbTrim($sentence);
+		}
+		return $trimmed;
+	}
+
+	/**
+	 * Return the number of sentences detected in the provided text.
+	 * @param string $text
+	 * @return integer
+	 */
+	public function count($text)
+	{
+		return count($this->split($text));
+	}
 
 }