ParserInput::peek() - Code Metrics - mishal/iless - Measure and Improve Code Quality continuously with Scrutinizer

ParserInput::peek() A
last analyzed 2017-03-09 13:30 UTC

↳ Parent: ParserInput

Complexity

Conditions	3
Paths	3

Size

Total Lines	11
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	11
rs	9.4285
c	0
b	0
f	0
cc	3
eloc	6
nc	3
nop	1

<?php

/*
 * This file is part of the ILess
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace ILess\Parser;

use ILess\Exception\ParserException;
use stdClass;

/**
 * Parser input utility.
 */
final class ParserInput
{
    const CHARCODE_SPACE = 32;
    const CHARCODE_TAB = 9;
    const CHARCODE_LF = 10;
    const CHARCODE_CR = 13;
    const CHARCODE_PLUS = 43;
    const CHARCODE_COMMA = 44;
    const CHARCODE_FORWARD_SLASH = 47;
    const CHARCODE_9 = 57;

    /**
     * Current index.
     *
     * @var int
     */
    public $i = 0;

    /**
     * LeSS input string.
     *
     * @var string
     */
    private $input;

    /**
     * Current chunk.
     *
     * @var
     */
    private $j = 0;
    private $saveStack = [];
    private $furthest;
    private $furthestPossibleErrorMessage;
    private $chunks;
    private $current;
    private $currentPos;

    /**
     * @var bool
     */
    public $autoCommentAbsorb = true;

    /**
     * @var array
     */
    public $commentStore = [];

    /**
     * @var bool
     */
    public $finished = false;

    /**
     * Constructor.
     */
    public function __construct()
    {
    }

    public function save()
    {
        $this->currentPos = $this->i;
        array_push($this->saveStack, (object) [
            'current' => $this->current,
            'i' => $this->i,
            'j' => $this->j,
        ]);
    }

    /**
     * @param null $possibleErrorMessage
     */
    public function restore($possibleErrorMessage = null)
    {
        if ($this->i > $this->furthest || ($this->i === $this->furthest && $possibleErrorMessage && !$this->furthestPossibleErrorMessage)) {
            $this->furthest = $this->i;
            $this->furthestPossibleErrorMessage = $possibleErrorMessage;
        }

        $state = array_pop($this->saveStack);
        $this->current = $state->current;
        $this->currentPos = $this->i = $state->i;
        $this->j = $state->i;
    }

    public function forget()
    {
        array_pop($this->saveStack);
    }

    /**
     * @param $offset
     *
     * @return bool
     */
    public function isWhiteSpace($offset = 0)
    {
        $pos = $this->i + ($offset);

        // return preg_match('/\s/', @$this->input[$pos]);
        return ctype_space(@$this->input[$pos]);
    }

    public function re($tok)
    {
        if ($this->i > $this->currentPos) {
            $this->current = substr($this->current, $this->i - $this->currentPos);
            $this->currentPos = $this->i;
        }

        $m = preg_match($tok, $this->current, $matches);

        if (preg_last_error() !== PREG_NO_ERROR) {
            throw new ParserException("Error in processing expression $tok!");
        }

        if (!$m) {
            return;
        }

        $this->skipWhitespace(strlen($matches[0]));

        return count($matches) === 1 ? $matches[0] : $matches;
    }

    public function char($tok)
    {
        if (@$this->input[$this->i] !== $tok) {
            return;
        }

        $this->skipWhitespace(1);

        return $tok;
    }

    public function str($tok)
    {
        $tokLength = strlen($tok);
        for ($i = 0; $i < $tokLength; ++$i) {
            if (@$this->input[$this->i + $i] !== $tok[$i]) {
                return;
            }
        }

        $this->skipWhitespace($tokLength);

        return $tok;
    }

    /**
     * @return null|string
     */
    public function quoted()
    {
        $startChar = $this->input[$this->i];

        if ($startChar !== "'" && $startChar !== '"') {
            return;
        }

        $length = strlen($this->input);
        $currentPosition = $this->i;
        for ($i = 1; $i + $currentPosition < $length; ++$i) {
            $nextChar = $this->input[$i + $currentPosition];
            switch ($nextChar) {
                case '\\':
                    $i++;
                    continue;
                case "\r":
                case "\n":
                    break;
                case $startChar:
                    $str = substr($this->input, $currentPosition, $i + 1);
                    $this->skipWhitespace($i + 1);

                    return $str;
            }
        }

        return;
    }

    private function skipWhitespace($length)
    {
        $oldi = $this->i;
        $oldj = $this->j;
        $curr = $this->i - $this->currentPos;
        $endIndex = $this->i + strlen($this->current) - $curr;
        $mem = ($this->i += $length);
        $inp = $this->input;

        for (; $this->i < $endIndex; ++$this->i) {
            $c = ord($inp[$this->i]);
            if ($this->autoCommentAbsorb && $c === self::CHARCODE_FORWARD_SLASH) {
                $nextChar = $inp[$this->i + 1];
                if ($nextChar === '/') {
                    $comment = [
                        'index' => $this->i,
                        'isLineComment' => true,
                    ];
                    $nextNewLine = strpos($inp, "\n", $this->i + 2);
                    if ($nextNewLine === false) {
                        $nextNewLine = $endIndex;
                    }
                    $this->i = $nextNewLine;
                    $comment['text'] = substr($inp, $comment['index'], $this->i - $comment['index']);
                    $this->commentStore[] = $comment;

                    continue;
                } elseif ($nextChar === '*') {
                    $nextStarSlash = strpos($inp, '*/', $this->i + 2);
                    if ($nextStarSlash >= 0) {
                        $comment = [
                            'index' => $this->i,
                            'text' => substr($inp, $this->i, $nextStarSlash + 2 - $this->i),
                        ];
                        $this->i += strlen($comment['text']) - 1;
                        $this->commentStore[] = $comment;
                        continue;
                    }
                }
                break;
            }

            if ($c !== self::CHARCODE_SPACE && ($c !== self::CHARCODE_LF) && ($c !== self::CHARCODE_TAB) && ($c !== self::CHARCODE_CR)) {
                break;
            }
        }

        $this->current = substr($this->current, $length + $this->i - $mem + $curr);
        $this->currentPos = $this->i;

        if (!$this->current) {
            if ($this->j < count($this->chunks) - 1) {
                $this->current = $this->chunks[++$this->j];
                $this->skipWhitespace(0);

                return true;
            }
            $this->finished = true;
        }

        return $oldi !== $this->i || $oldj !== $this->j;
    }

    /**
     * Original less.js function handles string and regexp here, I have to create
     * additional method for regexp, see `peekReg`.
     *
     * @param $tok
     *
     * @return bool
     */
    public function peek($tok)
    {
        $tokLength = strlen($tok);
        for ($i = 0; $i < $tokLength; ++$i) {
            if (@$this->input[$this->i + $i] !== $tok[$i]) {
                return false;
            }
        }

        return true;
    }

    public function peekReg($regexp)
    {
        if (preg_match($regexp, $this->current, $matches)) {
            return $matches;
        }
    }

    public function peekChar($tok)
    {
        return $this->input[$this->i] === $tok;
    }

    public function currentChar()
    {
        return @$this->input[$this->i];
    }

    public function getInput()
    {
        return $this->input;
    }

    public function peekNotNumeric()
    {
        $c = ord($this->input[$this->i]);

        // Is the first char of the dimension 0-9, '.', '+' or '-'
        return ($c > self::CHARCODE_9 || $c < self::CHARCODE_PLUS) || $c === self::CHARCODE_FORWARD_SLASH || $c === self::CHARCODE_COMMA;
    }

    /**
     * @param $string
     */
    public function start($string)
    {
        $this->input = $string;
        $this->i = $this->j = $this->currentPos = $this->furthest = 0;
        $this->chunks = [$string];
        $this->current = $this->chunks[0];
        $this->skipWhitespace(0);
    }

    /**
     * @return stdClass
     */
    public function end()
    {
        $isFinished = $this->i >= strlen($this->input);
        $message = null;
        if ($this->i < $this->furthest) {
            $message = $this->furthestPossibleErrorMessage;
            $this->i = $this->furthest;
        }

        return (object) [
            'isFinished' => $isFinished,
            'furthest' => $this->i,
            'furthestPossibleErrorMessage' => $message,
            'furthestReachedEnd' => $this->i >= strlen($this->input) - 1,
            'furthestChar' => @$this->input[$this->i],
        ];
    }
}


1			<?php
2
3			/*
4			* This file is part of the ILess
5			*
6			* For the full copyright and license information, please view the LICENSE
7			* file that was distributed with this source code.
8			*/
9
10			namespace ILess\Parser;
11
12			use ILess\Exception\ParserException;
13			use stdClass;
14
15			/**
16			* Parser input utility.
17			*/
18			final class ParserInput
19			{
20			const CHARCODE_SPACE = 32;
21			const CHARCODE_TAB = 9;
22			const CHARCODE_LF = 10;
23			const CHARCODE_CR = 13;
24			const CHARCODE_PLUS = 43;
25			const CHARCODE_COMMA = 44;
26			const CHARCODE_FORWARD_SLASH = 47;
27			const CHARCODE_9 = 57;
28
29			/**
30			* Current index.
31			*
32			* @var int
33			*/
34			public $i = 0;
35
36			/**
37			* LeSS input string.
38			*
39			* @var string
40			*/
41			private $input;
42
43			/**
44			* Current chunk.
45			*
46			* @var
47			*/
48			private $j = 0;
49			private $saveStack = [];
50			private $furthest;
51			private $furthestPossibleErrorMessage;
52			private $chunks;
53			private $current;
54			private $currentPos;
55
56			/**
57			* @var bool
58			*/
59			public $autoCommentAbsorb = true;
60
61			/**
62			* @var array
63			*/
64			public $commentStore = [];
65
66			/**
67			* @var bool
68			*/
69			public $finished = false;
70
71			/**
72			* Constructor.
73			*/
74			public function __construct()
75			{
76			}
77
78			public function save()
79			{
80			$this->currentPos = $this->i;
81			array_push($this->saveStack, (object) [
82			'current' => $this->current,
83			'i' => $this->i,
84			'j' => $this->j,
85			]);
86			}
87
88			/**
89			* @param null $possibleErrorMessage
90			*/
91			public function restore($possibleErrorMessage = null)
92			{
93			if ($this->i > $this->furthest \|\| ($this->i === $this->furthest && $possibleErrorMessage && !$this->furthestPossibleErrorMessage)) {
94			$this->furthest = $this->i;
95			$this->furthestPossibleErrorMessage = $possibleErrorMessage;
96			}
97
98			$state = array_pop($this->saveStack);
99			$this->current = $state->current;
100			$this->currentPos = $this->i = $state->i;
101			$this->j = $state->i;
102			}
103
104			public function forget()
105			{
106			array_pop($this->saveStack);
107			}
108
109			/**
110			* @param $offset
111			*
112			* @return bool
113			*/
114			public function isWhiteSpace($offset = 0)
115			{
116			$pos = $this->i + ($offset);
117
118			// return preg_match('/\s/', @$this->input[$pos]);
119			return ctype_space(@$this->input[$pos]);
120			}
121
122			public function re($tok)
123			{
124			if ($this->i > $this->currentPos) {
125			$this->current = substr($this->current, $this->i - $this->currentPos);
126			$this->currentPos = $this->i;
127			}
128
129			$m = preg_match($tok, $this->current, $matches);
130
131			if (preg_last_error() !== PREG_NO_ERROR) {
132			throw new ParserException("Error in processing expression $tok!");
133			}
134
135			if (!$m) {
136			return;
137			}
138
139			$this->skipWhitespace(strlen($matches[0]));
140
141			return count($matches) === 1 ? $matches[0] : $matches;
142			}
143
144			public function char($tok)
145			{
146			if (@$this->input[$this->i] !== $tok) {
147			return;
148			}
149
150			$this->skipWhitespace(1);
151
152			return $tok;
153			}
154
155			public function str($tok)
156			{
157			$tokLength = strlen($tok);
158			for ($i = 0; $i < $tokLength; ++$i) {
159			if (@$this->input[$this->i + $i] !== $tok[$i]) {
160			return;
161			}
162			}
163
164			$this->skipWhitespace($tokLength);
165
166			return $tok;
167			}
168
169			/**
170			* @return null\|string
171			*/
172			public function quoted()
173			{
174			$startChar = $this->input[$this->i];
175
176			if ($startChar !== "'" && $startChar !== '"') {
177			return;
178			}
179
180			$length = strlen($this->input);
181			$currentPosition = $this->i;
182			for ($i = 1; $i + $currentPosition < $length; ++$i) {
183			$nextChar = $this->input[$i + $currentPosition];
184			switch ($nextChar) {
185			case '\\':
186			$i++;
187			continue;
188			case "\r":
189			case "\n":
190			break;
191			case $startChar:
192			$str = substr($this->input, $currentPosition, $i + 1);
193			$this->skipWhitespace($i + 1);
194
195			return $str;
196			}
197			}
198
199			return;
200			}
201
202			private function skipWhitespace($length)
203			{
204			$oldi = $this->i;
205			$oldj = $this->j;
206			$curr = $this->i - $this->currentPos;
207			$endIndex = $this->i + strlen($this->current) - $curr;
208			$mem = ($this->i += $length);
209			$inp = $this->input;
210
211			for (; $this->i < $endIndex; ++$this->i) {
212			$c = ord($inp[$this->i]);
213			if ($this->autoCommentAbsorb && $c === self::CHARCODE_FORWARD_SLASH) {
214			$nextChar = $inp[$this->i + 1];
215			if ($nextChar === '/') {
216			$comment = [
217			'index' => $this->i,
218			'isLineComment' => true,
219			];
220			$nextNewLine = strpos($inp, "\n", $this->i + 2);
221			if ($nextNewLine === false) {
222			$nextNewLine = $endIndex;
223			}
224			$this->i = $nextNewLine;
225			$comment['text'] = substr($inp, $comment['index'], $this->i - $comment['index']);
226			$this->commentStore[] = $comment;
227
228			continue;
229			} elseif ($nextChar === '*') {
230			$nextStarSlash = strpos($inp, '*/', $this->i + 2);
231			if ($nextStarSlash >= 0) {
232			$comment = [
233			'index' => $this->i,
234			'text' => substr($inp, $this->i, $nextStarSlash + 2 - $this->i),
235			];
236			$this->i += strlen($comment['text']) - 1;
237			$this->commentStore[] = $comment;
238			continue;
239			}
240			}
241			break;
242			}
243
244			if ($c !== self::CHARCODE_SPACE && ($c !== self::CHARCODE_LF) && ($c !== self::CHARCODE_TAB) && ($c !== self::CHARCODE_CR)) {
245			break;
246			}
247			}
248
249			$this->current = substr($this->current, $length + $this->i - $mem + $curr);
250			$this->currentPos = $this->i;
251
252			if (!$this->current) {
253			if ($this->j < count($this->chunks) - 1) {
254			$this->current = $this->chunks[++$this->j];
255			$this->skipWhitespace(0);
256
257			return true;
258			}
259			$this->finished = true;
260			}
261
262			return $oldi !== $this->i \|\| $oldj !== $this->j;
263			}
264
265			/**
266			* Original less.js function handles string and regexp here, I have to create
267			* additional method for regexp, see `peekReg`.
268			*
269			* @param $tok
270			*
271			* @return bool
272			*/
273			public function peek($tok)
274			{
275			$tokLength = strlen($tok);
276			for ($i = 0; $i < $tokLength; ++$i) {
277			if (@$this->input[$this->i + $i] !== $tok[$i]) {
278			return false;
279			}
280			}
281
282			return true;
283			}
284
285			public function peekReg($regexp)
286			{
287			if (preg_match($regexp, $this->current, $matches)) {
288			return $matches;
289			}
290			}
291
292			public function peekChar($tok)
293			{
294			return $this->input[$this->i] === $tok;
295			}
296
297			public function currentChar()
298			{
299			return @$this->input[$this->i];
300			}
301
302			public function getInput()
303			{
304			return $this->input;
305			}
306
307			public function peekNotNumeric()
308			{
309			$c = ord($this->input[$this->i]);
310
311			// Is the first char of the dimension 0-9, '.', '+' or '-'
312			return ($c > self::CHARCODE_9 \|\| $c < self::CHARCODE_PLUS) \|\| $c === self::CHARCODE_FORWARD_SLASH \|\| $c === self::CHARCODE_COMMA;
313			}
314
315			/**
316			* @param $string
317			*/
318			public function start($string)
319			{
320			$this->input = $string;
321			$this->i = $this->j = $this->currentPos = $this->furthest = 0;
322			$this->chunks = [$string];
323			$this->current = $this->chunks[0];
324			$this->skipWhitespace(0);
325			}
326
327			/**
328			* @return stdClass
329			*/
330			public function end()
331			{
332			$isFinished = $this->i >= strlen($this->input);
333			$message = null;
334			if ($this->i < $this->furthest) {
335			$message = $this->furthestPossibleErrorMessage;
336			$this->i = $this->furthest;
337			}
338
339			return (object) [
340			'isFinished' => $isFinished,
341			'furthest' => $this->i,
342			'furthestPossibleErrorMessage' => $message,
343			'furthestReachedEnd' => $this->i >= strlen($this->input) - 1,
344			'furthestChar' => @$this->input[$this->i],
345			];
346			}
347			}
348

mishal / iless

ParserInput::peek() A last analyzed 2017-03-09 13:30 UTC

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ParserInput::peek() A
last analyzed 2017-03-09 13:30 UTC