Sentence::trimSentences() - Code Metrics - Inspection of "Improve code quality" - vanderlee/php-sentence - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Push — master ( 9ee15e...e4f543 )

by Martijn

created 2019-04-01 09:05 UTC

Sentence::trimSentences() A

↳ Parent: Sentence

Complexity

Conditions	2
Paths	2

Size

Total Lines	7
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	2
eloc	4
c	1
b	0
f	0
nc	2
nop	1
dl	0
loc	7
rs	10

<?php

/**
 * Segments sentences.
 * Clipping may not be perfect.
 * Sentence count should be VERY close to the truth.
 *
 * Multibyte safe (atleast for UTF-8), but rules based on germanic
 * language stucture (English, Dutch, German). Should work for most
 * latin-alphabet languages.
 *
 * @author Martijn van der Lee (@vanderlee)
 * @author @marktaw
 */
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));
    }

}


1			<?php
2
3			/**
4			* Segments sentences.
5			* Clipping may not be perfect.
6			* Sentence count should be VERY close to the truth.
7			*
8			* Multibyte safe (atleast for UTF-8), but rules based on germanic
9			* language stucture (English, Dutch, German). Should work for most
10			* latin-alphabet languages.
11			*
12			* @author Martijn van der Lee (@vanderlee)
13			* @author @marktaw
14			*/
15			class Sentence
16			{
17
18			/**
19			* Specify this flag with the split method to trim whitespace.
20			*/
21			const SPLIT_TRIM = 0x1;
22
23			/**
24			* List of characters used to terminate sentences.
25			*
26			* @var string[]
27			*/
28			private $terminals = array('.', '!', '?');
29
30			/**
31			* List of characters used for abbreviations.
32			*
33			* @var string[]
34			*/
35			private $abbreviators = array('.');
36
37			/**
38			* Multibyte safe version of standard trim() function.
39			*
40			* @param string $string
41			* @return string
42			*/
43			private static function mbTrim($string)
44			{
45			return mb_ereg_replace('^\s([\s\S]?)\s*$', '\1', $string);
46			}
47
48			/**
49			* A cross between mb_split and preg_split, adding the preg_split flags
50			* to mb_split.
51			*
52			* @param string $pattern
53			* @param string $string
54			* @param int $limit
55			* @param int $flags
56			* @return array
57			*/
58			private static function mbSplit($pattern, $string, $limit = -1, $flags = 0)
59			{
60			$split_no_empty = (bool)($flags & PREG_SPLIT_NO_EMPTY);
61			$offset_capture = (bool)($flags & PREG_SPLIT_OFFSET_CAPTURE);
62			$delim_capture = (bool)($flags & PREG_SPLIT_DELIM_CAPTURE);
63
64			$strlen = strlen($string); // bytes!
65			mb_ereg_search_init($string);
66
67			$lengths = array();
68			$position = 0;
69			while (($array = mb_ereg_search_pos($pattern, '')) !== false) {
70			// capture split
71			$lengths[] = array($array[0] - $position, false, null);
72
73			// move position
74			$position = $array[0] + $array[1];
75
76			// capture delimiter
77			$regs = mb_ereg_search_getregs();
78			$lengths[] = array($array[1], true, isset($regs[1]) && $regs[1]);
79
80			// Continue on?
81			if ($position >= $strlen) {
82			break;
83			}
84			}
85
86			// Add last bit, if not ending with split
87			$lengths[] = array($strlen - $position, false, null);
88
89			// Substrings
90			$parts = array();
91			$position = 0;
92			$count = 1;
93			foreach ($lengths as $length) {
94			$split_empty = $length[0] \|\| !$split_no_empty;
95			$is_delimiter = $length[1];
96			$is_captured = $length[2];
97
98			if ($limit > 0
99			&& !$is_delimiter
100			&& $split_empty
101			&& ++$count > $limit) {
102			if ($length[0] > 0
103			\|\| $split_empty) {
104			$parts[] = $offset_capture
105			? array(mb_strcut($string, $position), $position)
106			: mb_strcut($string, $position);
107			}
108			break;
109			} elseif ((!$is_delimiter
			0 ignored issues – show introduced 2019-04-01 09:07 UTC by Report Bug Copy Issue Report Consider adding parentheses for clarity. Current Interpretation: `(! $is_delimiter \|\| $del...ngth[0] \|\| $split_empty`, Probably Intended Meaning: `! $is_delimiter \|\| ($del...gth[0] \|\| $split_empty)` Loading history...
110			\|\| ($delim_capture
111			&& $is_captured))
112			&& ($length[0]
113			\|\| $split_empty)) {
114			$parts[] = $offset_capture
115			? array(mb_strcut($string, $position, $length[0]), $position)
116			: mb_strcut($string, $position, $length[0]);
117			}
118
119			$position += $length[0];
120			}
121
122			return $parts;
123			}
124
125			/**
126			* Breaks a piece of text into lines by linebreak.
127			* Eats up any linebreak characters as if one.
128			*
129			* Multibyte safe
130			*
131			* @param string $text
132			* @return string[]
133			*/
134			private static function linebreakSplit($text)
135			{
136			$lines = array();
137			$line = '';
138
139			foreach (self::mbSplit('([\r\n]+)', $text, -1, PREG_SPLIT_DELIM_CAPTURE) as $part) {
140			$line .= $part;
141			if (self::mbTrim($part) === '') {
142			$lines[] = $line;
143			$line = '';
144			}
145			}
146			$lines[] = $line;
147
148			return $lines;
149			}
150
151			/**
152			* Replace
153			*
154			* @staticvar array $chr_map
155			* @param string $string
156			* @return string
157			*/
158			private static function cleanUnicode($string)
159			{
160			//https://stackoverflow.com/questions/20025030/convert-all-types-of-smart-quotes-with-php
161			static $character_map = array(
162			// Windows codepage 1252
163			"\xC2\x82" => "'", // U+0082⇒U+201A single low-9 quotation mark
164			"\xC2\x84" => '"', // U+0084⇒U+201E double low-9 quotation mark
165			"\xC2\x8B" => "'", // U+008B⇒U+2039 single left-pointing angle quotation mark
166			"\xC2\x91" => "'", // U+0091⇒U+2018 left single quotation mark
167			"\xC2\x92" => "'", // U+0092⇒U+2019 right single quotation mark
168			"\xC2\x93" => '"', // U+0093⇒U+201C left double quotation mark
169			"\xC2\x94" => '"', // U+0094⇒U+201D right double quotation mark
170			"\xC2\x9B" => "'", // U+009B⇒U+203A single right-pointing angle quotation mark
171			// Regular Unicode // U+0022 quotation mark (")
172			// U+0027 apostrophe (')
173			"\xC2\xAB" => '"', // U+00AB left-pointing double angle quotation mark
174			"\xC2\xBB" => '"', // U+00BB right-pointing double angle quotation mark
175			"\xE2\x80\x98" => "'", // U+2018 left single quotation mark
176			"\xE2\x80\x99" => "'", // U+2019 right single quotation mark
177			"\xE2\x80\x9A" => "'", // U+201A single low-9 quotation mark
178			"\xE2\x80\x9B" => "'", // U+201B single high-reversed-9 quotation mark
179			"\xE2\x80\x9C" => '"', // U+201C left double quotation mark
180			"\xE2\x80\x9D" => '"', // U+201D right double quotation mark
181			"\xE2\x80\x9E" => '"', // U+201E double low-9 quotation mark
182			"\xE2\x80\x9F" => '"', // U+201F double high-reversed-9 quotation mark
183			"\xE2\x80\xB9" => "'", // U+2039 single left-pointing angle quotation mark
184			"\xE2\x80\xBA" => "'", // U+203A single right-pointing angle quotation mark
185			);
186
187			$character = array_keys($character_map); // but: for efficiency you should
188			$replace = array_values($character_map); // pre-calculate these two arrays
189			return str_replace($character, $replace, html_entity_decode($string, ENT_QUOTES, "UTF-8"));
190			}
191
192			/**
193			* Splits an array of lines by (consecutive sequences of)
194			* terminals, keeping terminals.
195			*
196			* Multibyte safe (atleast for UTF-8)
197			*
198			* For example:
199			* "There ... is. More!"
200			* ... becomes ...
201			* [ "There ", "...", " is", ".", " More", "!" ]
202			*
203			* @param string $line
204			* @return string[]
205			*/
206			private function punctuationSplit($line)
207			{
208			$parts = array();
209
210			$chars = preg_split('//u', $line, -1, PREG_SPLIT_NO_EMPTY); // This is UTF8 multibyte safe!
211			$is_terminal = in_array($chars[0], $this->terminals);
212
213			$part = '';
214			foreach ($chars as $index => $char) {
215			if (in_array($char, $this->terminals) !== $is_terminal) {
216			$parts[] = $part;
217			$part = '';
218			$is_terminal = !$is_terminal;
219			}
220			$part .= $char;
221			}
222
223			if (!empty($part)) {
224			$parts[] = $part;
225			}
226
227			return $parts;
228			}
229
230			/**
231			* Appends each terminal item after it's preceding
232			* non-terminals.
233			*
234			* Multibyte safe (atleast for UTF-8)
235			*
236			* For example:
237			* [ "There ", "...", " is", ".", " More", "!" ]
238			* ... becomes ...
239			* [ "There ... is.", "More!" ]
240			*
241			* @param string[] $punctuations
242			* @return string[]
243			*/
244			private function punctuationMerge($punctuations)
245			{
246			$definite_terminals = array_diff($this->terminals, $this->abbreviators);
247
248			$merges = array();
249			$merge = '';
250
251			foreach ($punctuations as $punctuation) {
252			if ($punctuation !== '') {
253			$merge .= $punctuation;
254			if (mb_strlen($punctuation) === 1
255			&& in_array($punctuation, $this->terminals)) {
256			$merges[] = $merge;
257			$merge = '';
258			} else {
259			foreach ($definite_terminals as $terminal) {
260			if (mb_strpos($punctuation, $terminal) !== false) {
261			$merges[] = $merge;
262			$merge = '';
263			break;
264			}
265			}
266			}
267			}
268			}
269			if (!empty($merge)) {
270			$merges[] = $merge;
271			}
272
273			return $merges;
274			}
275
276			/**
277			* Looks for capitalized abbreviations & includes them with the following fragment.
278			*
279			* For example:
280			* [ "Last week, former director of the F.B.I. James B. Comey was fired. Mr. Comey was not available for comment." ]
281			* ... becomes ...
282			* [ "Last week, former director of the F.B.I. James B. Comey was fired." ]
283			* [ "Mr. Comey was not available for comment." ]
284			*
285			* @param string[] $fragments
286			* @return string[]
287			*/
288			private function abbreviationMerge($fragments)
289			{
290			$return_fragment = array();
291
292			$previous_string = '';
293			$previous_is_abbreviation = false;
294			$i = 0;
295
296			foreach ($fragments as $fragment) {
297			$current_string = $fragment;
298			$words = mb_split('\s+', self::mbTrim($fragment));
299
300			$word_count = count($words);
301
302			// if last word of fragment starts with a Capital, ends in "." & has less than 3 characters, trigger "is abbreviation"
303			$last_word = trim($words[$word_count - 1]);
304			$last_is_capital = preg_match('#^\p{Lu}#u', $last_word);
305			$last_is_abbreviation = substr(trim($fragment), -1) === '.';
306			$is_abbreviation = $last_is_capital > 0
307			&& $last_is_abbreviation > 0
308			&& mb_strlen($last_word) <= 3;
309
310			// merge previous fragment with this
311			if ($previous_is_abbreviation === true) {
312			$current_string = $previous_string . $current_string;
313			}
314			$return_fragment[$i] = $current_string;
315
316			$previous_is_abbreviation = $is_abbreviation;
317			$previous_string = $current_string;
318			// only increment if this isn't an abbreviation
319			if ($is_abbreviation === false) {
320			$i++;
321			}
322			}
323			return $return_fragment;
324			}
325
326			/**
327			* Merges any part starting with a closing parenthesis ')' to the previous
328			* part.
329			*
330			* @param string[] $parts
331			* @return string[]
332			*/
333			private function parenthesesMerge($parts)
334			{
335			$subsentences = array();
336
337			foreach ($parts as $part) {
338			if ($part[0] === ')') {
339			$subsentences[count($subsentences) - 1] .= $part;
340			} else {
341			$subsentences[] = $part;
342			}
343			}
344
345			return $subsentences;
346			}
347
348			/**
349			* Looks for closing quotes to include them with the previous statement.
350			* "That was very interesting," he said.
351			* "That was very interesting."
352			*
353			* @param string[] $statements
354			* @return string[]
355			*/
356			private function closeQuotesMerge($statements)
357			{
358			$i = 0;
359			$previous_statement = "";
360			$return = array();
361			foreach ($statements as $statement) {
362			// detect end quote - if the entire string is a quotation mark, or it's [quote, space, lowercase]
363			if (trim($statement) === '"'
364			\|\| trim($statement) === "'"
365			\|\| (
366			(substr($statement, 0, 1) === '"'
367			\|\| substr($statement, 0, 1) === "'")
368			&& substr($statement, 1, 1) === ' '
369			&& ctype_lower(substr($statement, 2, 1)) === true
370			)
371			) {
372			$statement = $previous_statement . $statement;
373			} else {
374			$i++;
375			}
376
377			$return[$i] = $statement;
378			$previous_statement = $statement;
379			}
380
381			return $return;
382			}
383
384			/**
385			* Merges items into larger sentences.
386			* Multibyte safe
387			*
388			* @param string[] $shorts
389			* @return string[]
390			*/
391			private function sentenceMerge($shorts)
392			{
393			$non_abbreviating_terminals = array_diff($this->terminals, $this->abbreviators);
394
395			$sentences = array();
396
397			$sentence = '';
398			$has_words = false;
399			$previous_word_ending = null;
400			foreach ($shorts as $short) {
401			$word_count = count(mb_split('\s+', self::mbTrim($short)));
402			$after_non_abbreviating_terminal = in_array($previous_word_ending, $non_abbreviating_terminals);
403
404			if ($after_non_abbreviating_terminal
405			\|\| ($has_words && $word_count > 1)) {
406			$sentences[] = $sentence;
407			$sentence = '';
408			$has_words = $word_count > 1;
409			} else {
410			$has_words = ($has_words
411			\|\| $word_count > 1);
412			}
413
414			$sentence .= $short;
415			$previous_word_ending = mb_substr($short, -1);
416			}
417			if (!empty($sentence)) {
418			$sentences[] = $sentence;
419			}
420
421			return $sentences;
422			}
423
424			/**
425			* Return the sentences sentences detected in the provided text.
426			* Set the Sentence::SPLIT_TRIM flag to trim whitespace.
427			* @param string $text
428			* @param integer $flags
429			* @return string[]
430			*/
431			public function split($text, $flags = 0)
432			{
433			$sentences = array();
434
435			// clean funny quotes
436			$text = self::cleanUnicode($text);
437
438			// Split
439			foreach (self::linebreakSplit($text) as $line) {
440			if (self::mbTrim($line) !== '') {
441			$punctuations = $this->punctuationSplit($line);
442			$parentheses = $this->parenthesesMerge($punctuations); // also works after punctuationMerge or abbreviationMerge
443			$merges = $this->punctuationMerge($parentheses);
444			$shorts = $this->abbreviationMerge($merges);
445			$quotes = $this->closeQuotesMerge($shorts);
446			$sentences = array_merge($sentences, $this->sentenceMerge($quotes));
447			}
448			}
449
450			// Post process
451			if ($flags & self::SPLIT_TRIM) {
452			return self::trimSentences($sentences);
453			}
454
455			return $sentences;
456			}
457
458			/**
459			* Multibyte trim each string in an array.
460			* @param string[] $sentences
461			* @return string[]
462			*/
463			private static function trimSentences($sentences)
464			{
465			$trimmed = array();
466			foreach ($sentences as $sentence) {
467			$trimmed[] = self::mbTrim($sentence);
468			}
469			return $trimmed;
470			}
471
472			/**
473			* Return the number of sentences detected in the provided text.
474			* @param string $text
475			* @return integer
476			*/
477			public function count($text)
478			{
479			return count($this->split($text));
480			}
481
482			}
483

vanderlee / php-sentence

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Sentence::trimSentences() A

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