Scanner::doCharsWhile() - Code Metrics - Inspection of "Improve Travis configuration and add PHP-CS-Fixer" - Masterminds/html5-php - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#160)

unknown

created 2018-11-25 14:14 UTC

Scanner::doCharsWhile() A

↳ Parent: Scanner

Complexity

Conditions	4
Paths	3

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	4.432

Importance

Changes

Metric	Value
dl	0
loc	17
ccs	7
cts	10
cp	0.7
rs	9.7
c	0
b	0
f	0
cc	4
nc	3
nop	2
crap	4.432

<?php

namespace Masterminds\HTML5\Parser;

use Masterminds\HTML5\Exception;

/**
 * The scanner scans over a given data input to react appropriately to characters.
 */
class Scanner
{
    const CHARS_HEX = 'abcdefABCDEF01234567890';
    const CHARS_ALNUM = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890';
    const CHARS_ALPHA = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';

    /**
     * The string data we're parsing.
     */
    private $data;

    /**
     * The current integer byte position we are in $data.
     */
    private $char;

    /**
     * Length of $data; when $char === $data, we are at the end-of-file.
     */
    private $EOF;

    /**
     * Parse errors.
     */
    public $errors = array();

    /**
     * Create a new Scanner.
     *
     * @param string $data     Data to parse.
     * @param string $encoding The encoding to use for the data.
     *
     * @throws Exception If the given data cannot be encoded to UTF-8.
     */
    public function __construct($data, $encoding = 'UTF-8')
    {
        if ($data instanceof InputStream) {
            @trigger_error('InputStream objects are deprecated since version 2.4 and will be removed in 3.0. Use strings instead.', E_USER_DEPRECATED);
            $data = (string) $data;
        }

        $data = UTF8Utils::convertToUTF8($data, $encoding);

        // There is good reason to question whether it makes sense to
        // do this here, since most of these checks are done during
        // parsing, and since this check doesn't actually *do* anything.
        $this->errors = UTF8Utils::checkForIllegalCodepoints($data);

        $data = $this->replaceLinefeeds($data);

        $this->data = $data;
        $this->char = 0;
        $this->EOF = strlen($data);
    }

    /**
     * Check if upcomming chars match the given sequence.
     *
     * This will read the stream for the $sequence. If it's
     * found, this will return true. If not, return false.
     * Since this unconsumes any chars it reads, the caller
     * will still need to read the next sequence, even if
     * this returns true.
     *
     * Example: $this->scanner->sequenceMatches('</script>') will
     * see if the input stream is at the start of a
     * '</script>' string.
     *
     * @param string $sequence
     * @param bool   $caseSensitive
     *
     * @return bool
     */
    public function sequenceMatches($sequence, $caseSensitive = true)
    {
        $portion = substr($this->data, $this->char, strlen($sequence));

        return $caseSensitive ? $portion === $sequence : 0 === strcasecmp($portion, $sequence);
    }

    /**
     * Get the current position.
     *
     * @return int The current intiger byte position.
     */
    public function position()
    {
        return $this->char;
    }

    /**
     * Take a peek at the next character in the data.
     *
     * @return string The next character.
     */
    public function peek()
    {
        if (($this->char + 1) <= $this->EOF) {
            return $this->data[$this->char + 1];
        }

        return false;
    }

    /**
     * Get the next character.
     * Note: This advances the pointer.
     *
     * @return string The next character.
     */
    public function next()
    {
        ++$this->char;

        if ($this->char < $this->EOF) {
            return $this->data[$this->char];
        }

        return false;
    }

    /**
     * Get the current character.
     * Note, this does not advance the pointer.
     *
     * @return string The current character.
     */
    public function current()
    {
        if ($this->char < $this->EOF) {
            return $this->data[$this->char];
        }

        return false;
    }

    /**
     * Silently consume N chars.
     *
     * @param int $count
     */
    public function consume($count = 1)
    {
        $this->char += $count;
    }

    /**
     * Unconsume some of the data.
     * This moves the data pointer backwards.
     *
     * @param int $howMany The number of characters to move the pointer back.
     */
    public function unconsume($howMany = 1)
    {
        if (($this->char - $howMany) >= 0) {
            $this->char -= $howMany;
        }
    }

    /**
     * Get the next group of that contains hex characters.
     * Note, along with getting the characters the pointer in the data will be
     * moved as well.
     *
     * @return string The next group that is hex characters.
     */
    public function getHex()
    {
        return $this->doCharsWhile(static::CHARS_HEX);
    }

    /**
     * Get the next group of characters that are ASCII Alpha characters.
     * Note, along with getting the characters the pointer in the data will be
     * moved as well.
     *
     * @return string The next group of ASCII alpha characters.
     */
    public function getAsciiAlpha()
    {
        return $this->doCharsWhile(static::CHARS_ALPHA);
    }

    /**
     * Get the next group of characters that are ASCII Alpha characters and numbers.
     * Note, along with getting the characters the pointer in the data will be
     * moved as well.
     *
     * @return string The next group of ASCII alpha characters and numbers.
     */
    public function getAsciiAlphaNum()
    {
        return $this->doCharsWhile(static::CHARS_ALNUM);
    }

    /**
     * Get the next group of numbers.
     * Note, along with getting the characters the pointer in the data will be
     * moved as well.
     *
     * @return string The next group of numbers.
     */
    public function getNumeric()
    {
        return $this->doCharsWhile('0123456789');
    }

    /**
     * Consume whitespace.
     * Whitespace in HTML5 is: formfeed, tab, newline, space.
     *
     * @return int The length of the matched whitespaces.
     */
    public function whitespace()
    {
        if ($this->char >= $this->EOF) {
            return false;
        }

        $len = strspn($this->data, "\n\t\f ", $this->char);

        $this->char += $len;

        return $len;
    }

    /**
     * Returns the current line that is being consumed.
     *
     * @return int The current line number.
     */
    public function currentLine()
    {
        if (empty($this->EOF) || 0 === $this->char) {
            return 1;
        }

        // Add one to $this->char because we want the number for the next
        // byte to be processed.
        return substr_count($this->data, "\n", 0, min($this->char, $this->EOF)) + 1;
    }

    /**
     * Read chars until something in the mask is encountered.
     *
     * @param string $mask
     *
     * @return mixed
     */
    public function charsUntil($mask)
    {
        return $this->doCharsUntil($mask);
    }

    /**
     * Read chars as long as the mask matches.
     *
     * @param string $mask
     *
     * @return int
     */
    public function charsWhile($mask)
    {
        return $this->doCharsWhile($mask);
    }

    /**
     * Returns the current column of the current line that the tokenizer is at.
     *
     * Newlines are column 0. The first char after a newline is column 1.
     *
     * @return int The column number.
     */
    public function columnOffset()
    {
        // Short circuit for the first char.
        if (0 === $this->char) {
            return 0;
        }

        // strrpos is weird, and the offset needs to be negative for what we
        // want (i.e., the last \n before $this->char). This needs to not have
        // one (to make it point to the next character, the one we want the
        // position of) added to it because strrpos's behaviour includes the
        // final offset byte.
        $backwardFrom = $this->char - 1 - strlen($this->data);
        $lastLine = strrpos($this->data, "\n", $backwardFrom);

        // However, for here we want the length up until the next byte to be
        // processed, so add one to the current byte ($this->char).
        if (false !== $lastLine) {
            $findLengthOf = substr($this->data, $lastLine + 1, $this->char - 1 - $lastLine);
        } else {
            // After a newline.
            $findLengthOf = substr($this->data, 0, $this->char);
        }

        return UTF8Utils::countChars($findLengthOf);
    }

    /**
     * Get all characters until EOF.
     *
     * This consumes characters until the EOF.
     *
     * @return int The number of characters remaining.
     */
    public function remainingChars()
    {
        if ($this->char < $this->EOF) {
            $data = substr($this->data, $this->char);
            $this->char = $this->EOF;

            return $data;
        }

        return ''; // false;
    }

    /**
     * Replace linefeed characters according to the spec.
     *
     * @param $data
     *
     * @return string
     */
    private function replaceLinefeeds($data)
    {
        /*
         * U+000D CARRIAGE RETURN (CR) characters and U+000A LINE FEED (LF) characters are treated specially.
         * Any CR characters that are followed by LF characters must be removed, and any CR characters not
         * followed by LF characters must be converted to LF characters. Thus, newlines in HTML DOMs are
         * represented by LF characters, and there are never any CR characters in the input to the tokenization
         * stage.
         */
        $crlfTable = array(
            "\0" => "\xEF\xBF\xBD",
            "\r\n" => "\n",
            "\r" => "\n",
        );

        return strtr($data, $crlfTable);
    }

    /**
     * Read to a particular match (or until $max bytes are consumed).
     *
     * This operates on byte sequences, not characters.
     *
     * Matches as far as possible until we reach a certain set of bytes
     * and returns the matched substring.
     *
     * @param string $bytes Bytes to match.
     * @param int    $max   Maximum number of bytes to scan.
     *
     * @return mixed Index or false if no match is found. You should use strong
     *               equality when checking the result, since index could be 0.
     */
    private function doCharsUntil($bytes, $max = null)
    {
        if ($this->char >= $this->EOF) {
            return false;
        }

        if (0 === $max || $max) {
            $len = strcspn($this->data, $bytes, $this->char, $max);
        } else {
            $len = strcspn($this->data, $bytes, $this->char);
        }

        $string = (string) substr($this->data, $this->char, $len);
        $this->char += $len;

        return $string;
    }

    /**
     * Returns the string so long as $bytes matches.
     *
     * Matches as far as possible with a certain set of bytes
     * and returns the matched substring.
     *
     * @param string $bytes A mask of bytes to match. If ANY byte in this mask matches the
     *                      current char, the pointer advances and the char is part of the
     *                      substring.
     * @param int    $max   The max number of chars to read.
     *
     * @return string
     */
    private function doCharsWhile($bytes, $max = null)
    {
        if ($this->char >= $this->EOF) {
            return false;
        }

        if (0 === $max || $max) {
            $len = strspn($this->data, $bytes, $this->char, $max);
        } else {
            $len = strspn($this->data, $bytes, $this->char);
        }

        $string = (string) substr($this->data, $this->char, $len);
        $this->char += $len;

        return $string;
    }
}


1		<?php
2
3		namespace Masterminds\HTML5\Parser;
4
5		use Masterminds\HTML5\Exception;
6
7		/**
8		* The scanner scans over a given data input to react appropriately to characters.
9		*/
10		class Scanner
11		{
12		const CHARS_HEX = 'abcdefABCDEF01234567890';
13		const CHARS_ALNUM = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890';
14		const CHARS_ALPHA = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
15
16		/**
17		* The string data we're parsing.
18		*/
19		private $data;
20
21		/**
22		* The current integer byte position we are in $data.
23		*/
24		private $char;
25
26		/**
27		* Length of $data; when $char === $data, we are at the end-of-file.
28		*/
29		private $EOF;
30
31		/**
32		* Parse errors.
33		*/
34		public $errors = array();
35
36		/**
37		* Create a new Scanner.
38		*
39		* @param string $data Data to parse.
40		* @param string $encoding The encoding to use for the data.
41		*
42		* @throws Exception If the given data cannot be encoded to UTF-8.
43		*/
44	142	public function __construct($data, $encoding = 'UTF-8')
45		{
46	142	if ($data instanceof InputStream) {
47	4	@trigger_error('InputStream objects are deprecated since version 2.4 and will be removed in 3.0. Use strings instead.', E_USER_DEPRECATED);
48	4	$data = (string) $data;
49	4	}
50
51	142	$data = UTF8Utils::convertToUTF8($data, $encoding);
52
53		// There is good reason to question whether it makes sense to
54		// do this here, since most of these checks are done during
55		// parsing, and since this check doesn't actually do anything.
56	142	$this->errors = UTF8Utils::checkForIllegalCodepoints($data);
57
58	142	$data = $this->replaceLinefeeds($data);
59
60	142	$this->data = $data;
61	142	$this->char = 0;
62	142	$this->EOF = strlen($data);
63	142	}
64
65		/**
66		* Check if upcomming chars match the given sequence.
67		*
68		* This will read the stream for the $sequence. If it's
69		* found, this will return true. If not, return false.
70		* Since this unconsumes any chars it reads, the caller
71		* will still need to read the next sequence, even if
72		* this returns true.
73		*
74		* Example: $this->scanner->sequenceMatches('</script>') will
75		* see if the input stream is at the start of a
76		* '</script>' string.
77		*
78		* @param string $sequence
79		* @param bool $caseSensitive
80		*
81		* @return bool
82		*/
83	51	public function sequenceMatches($sequence, $caseSensitive = true)
84		{
85	51	$portion = substr($this->data, $this->char, strlen($sequence));
86
87	51	return $caseSensitive ? $portion === $sequence : 0 === strcasecmp($portion, $sequence);
88		}
89
90		/**
91		* Get the current position.
92		*
93		* @return int The current intiger byte position.
94		*/
95	14	public function position()
96		{
97	14	return $this->char;
98		}
99
100		/**
101		* Take a peek at the next character in the data.
102		*
103		* @return string The next character.
104		*/
105	13	public function peek()
106		{
107	13	if (($this->char + 1) <= $this->EOF) {
108	13	return $this->data[$this->char + 1];
109		}
110
111		return false;
112		}
113
114		/**
115		* Get the next character.
116		* Note: This advances the pointer.
117		*
118		* @return string The next character.
119		*/
120	137	public function next()
121		{
122	137	++$this->char;
123
124	137	if ($this->char < $this->EOF) {
125	137	return $this->data[$this->char];
126		}
127
128	124	return false;
129		}
130
131		/**
132		* Get the current character.
133		* Note, this does not advance the pointer.
134		*
135		* @return string The current character.
136		*/
137	128	public function current()
138		{
139	128	if ($this->char < $this->EOF) {
140	126	return $this->data[$this->char];
141		}
142
143	127	return false;
144		}
145
146		/**
147		* Silently consume N chars.
148		*
149		* @param int $count
150		*/
151	42	public function consume($count = 1)
152		{
153	42	$this->char += $count;
154	42	}
155
156		/**
157		* Unconsume some of the data.
158		* This moves the data pointer backwards.
159		*
160		* @param int $howMany The number of characters to move the pointer back.
161		*/
162	47	public function unconsume($howMany = 1)
163		{
164	47	if (($this->char - $howMany) >= 0) {
165	47	$this->char -= $howMany;
166	47	}
167	47	}
168
169		/**
170		* Get the next group of that contains hex characters.
171		* Note, along with getting the characters the pointer in the data will be
172		* moved as well.
173		*
174		* @return string The next group that is hex characters.
175		*/
176	3	public function getHex()
177		{
178	3	return $this->doCharsWhile(static::CHARS_HEX);
179		}
180
181		/**
182		* Get the next group of characters that are ASCII Alpha characters.
183		* Note, along with getting the characters the pointer in the data will be
184		* moved as well.
185		*
186		* @return string The next group of ASCII alpha characters.
187		*/
188	9	public function getAsciiAlpha()
189		{
190	9	return $this->doCharsWhile(static::CHARS_ALPHA);
191		}
192
193		/**
194		* Get the next group of characters that are ASCII Alpha characters and numbers.
195		* Note, along with getting the characters the pointer in the data will be
196		* moved as well.
197		*
198		* @return string The next group of ASCII alpha characters and numbers.
199		*/
200	15	public function getAsciiAlphaNum()
201		{
202	15	return $this->doCharsWhile(static::CHARS_ALNUM);
203		}
204
205		/**
206		* Get the next group of numbers.
207		* Note, along with getting the characters the pointer in the data will be
208		* moved as well.
209		*
210		* @return string The next group of numbers.
211		*/
212	2	public function getNumeric()
213		{
214	2	return $this->doCharsWhile('0123456789');
215		}
216
217		/**
218		* Consume whitespace.
219		* Whitespace in HTML5 is: formfeed, tab, newline, space.
220		*
221		* @return int The length of the matched whitespaces.
222		*/
223	121	public function whitespace()
224		{
225	121	if ($this->char >= $this->EOF) {
226	3	return false;
227		}
228
229	121	$len = strspn($this->data, "\n\t\f ", $this->char);
230
231	121	$this->char += $len;
232
233	121	return $len;
234		}
235
236		/**
237		* Returns the current line that is being consumed.
238		*
239		* @return int The current line number.
240		*/
241	16	public function currentLine()
242		{
243	16	if (empty($this->EOF) \|\| 0 === $this->char) {
244	1	return 1;
245		}
246
247		// Add one to $this->char because we want the number for the next
248		// byte to be processed.
249	16	return substr_count($this->data, "\n", 0, min($this->char, $this->EOF)) + 1;
250		}
251
252		/**
253		* Read chars until something in the mask is encountered.
254		*
255		* @param string $mask
256		*
257		* @return mixed
258		*/
259	116	public function charsUntil($mask)
260		{
261	116	return $this->doCharsUntil($mask);
262		}
263
264		/**
265		* Read chars as long as the mask matches.
266		*
267		* @param string $mask
268		*
269		* @return int
270		*/
271	117	public function charsWhile($mask)
272		{
273	117	return $this->doCharsWhile($mask);
274		}
275
276		/**
277		* Returns the current column of the current line that the tokenizer is at.
278		*
279		* Newlines are column 0. The first char after a newline is column 1.
280		*
281		* @return int The column number.
282		*/
283	16	public function columnOffset()
284		{
285		// Short circuit for the first char.
286	16	if (0 === $this->char) {
287		return 0;
288		}
289
290		// strrpos is weird, and the offset needs to be negative for what we
291		// want (i.e., the last \n before $this->char). This needs to not have
292		// one (to make it point to the next character, the one we want the
293		// position of) added to it because strrpos's behaviour includes the
294		// final offset byte.
295	16	$backwardFrom = $this->char - 1 - strlen($this->data);
296	16	$lastLine = strrpos($this->data, "\n", $backwardFrom);
297
298		// However, for here we want the length up until the next byte to be
299		// processed, so add one to the current byte ($this->char).
300	16	if (false !== $lastLine) {
301	3	$findLengthOf = substr($this->data, $lastLine + 1, $this->char - 1 - $lastLine);
302	3	} else {
303		// After a newline.
304	14	$findLengthOf = substr($this->data, 0, $this->char);
305		}
306
307	16	return UTF8Utils::countChars($findLengthOf);
308		}
309
310		/**
311		* Get all characters until EOF.
312		*
313		* This consumes characters until the EOF.
314		*
315		* @return int The number of characters remaining.
316		*/
317	1	public function remainingChars()
318		{
319	1	if ($this->char < $this->EOF) {
320	1	$data = substr($this->data, $this->char);
321	1	$this->char = $this->EOF;
322
323	1	return $data;
324		}
325
326		return ''; // false;
327		}
328
329		/**
330		* Replace linefeed characters according to the spec.
331		*
332		* @param $data
333		*
334		* @return string
335		*/
336	142	private function replaceLinefeeds($data)
337		{
338		/*
339		* U+000D CARRIAGE RETURN (CR) characters and U+000A LINE FEED (LF) characters are treated specially.
340		* Any CR characters that are followed by LF characters must be removed, and any CR characters not
341		* followed by LF characters must be converted to LF characters. Thus, newlines in HTML DOMs are
342		* represented by LF characters, and there are never any CR characters in the input to the tokenization
343		* stage.
344		*/
345		$crlfTable = array(
346	142	"\0" => "\xEF\xBF\xBD",
347	142	"\r\n" => "\n",
348	142	"\r" => "\n",
349	142	);
350
351	142	return strtr($data, $crlfTable);
352		}
353
354		/**
355		* Read to a particular match (or until $max bytes are consumed).
356		*
357		* This operates on byte sequences, not characters.
358		*
359		* Matches as far as possible until we reach a certain set of bytes
360		* and returns the matched substring.
361		*
362		* @param string $bytes Bytes to match.
363		* @param int $max Maximum number of bytes to scan.
364		*
365		* @return mixed Index or false if no match is found. You should use strong
366		* equality when checking the result, since index could be 0.
367		*/
368	116	private function doCharsUntil($bytes, $max = null)
369		{
370	116	if ($this->char >= $this->EOF) {
371	4	return false;
372		}
373
374	116	if (0 === $max \|\| $max) {
375		$len = strcspn($this->data, $bytes, $this->char, $max);
376		} else {
377	116	$len = strcspn($this->data, $bytes, $this->char);
378		}
379
380	116	$string = (string) substr($this->data, $this->char, $len);
381	116	$this->char += $len;
382
383	116	return $string;
384		}
385
386		/**
387		* Returns the string so long as $bytes matches.
388		*
389		* Matches as far as possible with a certain set of bytes
390		* and returns the matched substring.
391		*
392		* @param string $bytes A mask of bytes to match. If ANY byte in this mask matches the
393		* current char, the pointer advances and the char is part of the
394		* substring.
395		* @param int $max The max number of chars to read.
396		*
397		* @return string
398		*/
399	129	private function doCharsWhile($bytes, $max = null)
400		{
401	129	if ($this->char >= $this->EOF) {
402		return false;
403		}
404
405	129	if (0 === $max \|\| $max) {
406		$len = strspn($this->data, $bytes, $this->char, $max);
407		} else {
408	129	$len = strspn($this->data, $bytes, $this->char);
409		}
410
411	129	$string = (string) substr($this->data, $this->char, $len);
412	129	$this->char += $len;
413
414	129	return $string;
415		}
416		}
417

Masterminds / html5-php

Pull Request — master (#160)

Scanner::doCharsWhile() A

Complexity

Size

Duplication

Code Coverage

Importance

Duplication Side-by-Side

Filter issues like