Tokenizer::lex() - Code Metrics - Inspection of "finished beta version of documentation" - Youshido/GraphQL - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( f8702a...461e07 )

by Alexandr

created 2016-05-06 05:45 UTC

Tokenizer::lex() A

↳ Parent: Tokenizer

Complexity

Conditions	1
Paths	1

Size

Total Lines	7
Code Lines	4

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	4
CRAP Score	1

Importance

Changes	2
Bugs	0	Features	0

Metric	Value
c	2
b	0
f	0
dl	0
loc	7
ccs	4
cts	4
cp	1
rs	9.4285
cc	1
eloc	4
nc	1
nop	0
crap	1

<?php
/**
 * Date: 23.11.15
 *
 * @author Portey Vasil <[email protected]>
 */

namespace Youshido\GraphQL\Parser;

use Youshido\GraphQL\Parser\Exception\SyntaxErrorException;

class Tokenizer
{
    protected $source;
    protected $pos       = 0;
    protected $line      = 1;
    protected $lineStart = 0;

    /** @var  Token */
    protected $lookAhead;

    public function setSource($source)
    {
        $this->source    = $source;
        $this->lookAhead = $this->next();
    }

    protected function next()
    {
        $this->skipWhitespace();

        /** @var Token $token */
        $token = $this->scan();

        return $token;
    }

    protected function skipWhitespace()
    {
        while ($this->pos < strlen($this->source)) {
            $ch = $this->source[$this->pos];
            if ($ch === ' ' || $ch === "\t") {
                $this->pos++;
            } elseif ($ch === '#') {
                $this->pos++;
                while (
                    $this->pos < strlen($this->source) &&
                    ($code = ord($this->source[$this->pos])) &&
                    $code !== 10 && $code !== 13 && $code !== 0x2028 && $code !== 0x2029
                ) {
                    $this->pos++;
                }
            } elseif ($ch === "\r") {
                $this->pos++;
                if ($this->source[$this->pos] === "\n") {
                    $this->pos++;
                }
                $this->line++;
                $this->lineStart = $this->pos;
            } elseif ($ch === "\n") {
                $this->pos++;
                $this->line++;
                $this->lineStart = $this->pos;
            } else {
                break;
            }
        }
    }

    /**
     * @return Token
     */
    protected function scan()
    {
        if ($this->pos >= strlen($this->source)) {
            return new Token(Token::TYPE_END);
        }

        $ch = $this->source[$this->pos];
        switch ($ch) {
            case Token::TYPE_LPAREN:
                ++$this->pos;

                return new Token(Token::TYPE_LPAREN);
            case Token::TYPE_RPAREN:
                ++$this->pos;

                return new Token(Token::TYPE_RPAREN);
            case Token::TYPE_LBRACE:
                ++$this->pos;

                return new Token(Token::TYPE_LBRACE);
            case Token::TYPE_RBRACE:
                ++$this->pos;

                return new Token(Token::TYPE_RBRACE);
            case Token::TYPE_LT:
                ++$this->pos;

                return new Token(Token::TYPE_LT);
            case Token::TYPE_GT:
                ++$this->pos;

                return new Token(Token::TYPE_GT);
            case Token::TYPE_AMP:
                ++$this->pos;

                return new Token(Token::TYPE_AMP);
            case Token::TYPE_COMMA:
                ++$this->pos;

                return new Token(Token::TYPE_COMMA);
            case Token::TYPE_LSQUARE_BRACE:
                ++$this->pos;

                return new Token(Token::TYPE_LSQUARE_BRACE);
            case Token::TYPE_RSQUARE_BRACE:
                ++$this->pos;

                return new Token(Token::TYPE_RSQUARE_BRACE);
            case Token::TYPE_COLON:
                ++$this->pos;

                return new Token(Token::TYPE_COLON);

            case Token::TYPE_POINT:
                if ($this->checkFragment()) {
                    return new Token(Token::TYPE_FRAGMENT_REFERENCE);
                }

                break;

            case Token::TYPE_VARIABLE:
                ++$this->pos;

                return new Token(Token::TYPE_VARIABLE);
        }

        if ($ch === '_' || 'a' <= $ch && $ch <= 'z' || 'A' <= $ch && $ch <= 'Z') {
            return $this->scanWord();
        }

        if ($ch === '-' || '0' <= $ch && $ch <= '9') {
            return $this->scanNumber();
        }

        if ($ch === '"') {
            return $this->scanString();
        }

        throw $this->createIllegal();
    }

    protected function checkFragment()
    {
        $this->pos++;
        $ch = $this->source[$this->pos];

        $this->pos++;
        $nextCh = $this->source[$this->pos];

        $isset = $ch == Token::TYPE_POINT && $nextCh == Token::TYPE_POINT;

        if ($isset) {
            $this->pos++;

            return true;
        }

        return false;
    }

    protected function scanWord()
    {
        $start = $this->pos;
        $this->pos++;

        while ($this->pos < strlen($this->source)) {
            $ch = $this->source[$this->pos];

            if ($ch === '_' || $ch === '$' || 'a' <= $ch && $ch <= ('z') || 'A' <= $ch && $ch <= 'Z' || '0' <= $ch && $ch <= '9') {
                $this->pos++;
            } else {
                break;
            }
        }

        $value = substr($this->source, $start, $this->pos - $start);

        return new Token($this->getKeyword($value), $value);
    }

    protected function getKeyword($name)
    {
        switch ($name) {
            case 'null':
                return Token::TYPE_NULL;

            case 'true':
                return Token::TYPE_TRUE;

            case 'false':
                return Token::TYPE_FALSE;

            case 'query':
                return Token::TYPE_QUERY;

            case 'fragment':
                return Token::TYPE_FRAGMENT;

            case 'mutation':
                return Token::TYPE_MUTATION;

            case 'on':
                return Token::TYPE_ON;
        }

        return Token::TYPE_IDENTIFIER;
    }

    protected function scanNumber()
    {
        $start = $this->pos;
        if ($this->source[$this->pos] === '-') {
            ++$this->pos;
        }

        $this->skipInteger();

        if ($this->source[$this->pos] === '.') {
            $this->pos++;
            $this->skipInteger();
        }

        $value = substr($this->source, $start, $this->pos - $start);

        if (strpos($value, '.') === false) {
            $value = (int)$value;
        } else {
            $value = (float)$value;
        }

        return new Token(Token::TYPE_NUMBER, $value);
    }

    protected function skipInteger()
    {
        $start = $this->pos;

        while ($this->pos < strlen($this->source)) {
            $ch = $this->source[$this->pos];
            if ('0' <= $ch && $ch <= '9') {
                $this->pos++;
            } else {
                break;
            }
        }

        if ($this->pos - $start === 0) {
            throw $this->createIllegal();
        }
    }

    protected function createIllegal()
    {
        return $this->pos < strlen($this->source)
            ? $this->createError("Unexpected {$this->source[$this->pos]}")
            : $this->createError('Unexpected end of input');
    }

    protected function createError($message)
    {
        return new SyntaxErrorException($message . " ({$this->line}:{$this->getColumn()})");
    }

    protected function getColumn()
    {
        return $this->pos - $this->lineStart;
    }

    protected function scanString()
    {
        $this->pos++;

        $value = '';
        while ($this->pos < strlen($this->source)) {
            $ch = $this->source[$this->pos];
            if ($ch === '"' && $this->source[$this->pos - 1] != '\\') {
                $this->pos++;

                return new Token(Token::TYPE_STRING, $value);
            }

            $value .= $ch;
            $this->pos++;
        }

        throw $this->createIllegal();
    }

    protected function end()
    {
        return $this->lookAhead->getType() === Token::TYPE_END;
    }

    protected function peek()
    {
        return $this->lookAhead;
    }

    protected function lex()
    {
        $prev            = $this->lookAhead;
        $this->lookAhead = $this->next();

        return $prev;
    }

    protected function createUnexpected(Token $token)
    {
        switch ($token->getType()) {
            case Token::TYPE_END:
                return $this->createError('Unexpected end of input');
            case Token::TYPE_NUMBER:
                return $this->createError('Unexpected number');
            case Token::TYPE_STRING:
                return $this->createError('Unexpected string');
            case Token::TYPE_IDENTIFIER:
                return $this->createError('Unexpected identifier');
        }

        return new SyntaxErrorException('Unexpected token');
    }
}


1		<?php
2		/**
3		* Date: 23.11.15
4		*
5		* @author Portey Vasil <[email protected]>
6		*/
7
8		namespace Youshido\GraphQL\Parser;
9
10		use Youshido\GraphQL\Parser\Exception\SyntaxErrorException;
11
12		class Tokenizer
13		{
14		protected $source;
15		protected $pos = 0;
16		protected $line = 1;
17		protected $lineStart = 0;
18
19		/** @var Token */
20		protected $lookAhead;
21
22	49	public function setSource($source)
23		{
24	49	$this->source = $source;
25	49	$this->lookAhead = $this->next();
26	49	}
27
28	49	protected function next()
29		{
30	49	$this->skipWhitespace();
31
32		/** @var Token $token */
33	49	$token = $this->scan();
34
35	49	return $token;
36		}
37
38	49	protected function skipWhitespace()
39		{
40	49	while ($this->pos < strlen($this->source)) {
41	49	$ch = $this->source[$this->pos];
42	49	if ($ch === ' ' \|\| $ch === "\t") {
43	47	$this->pos++;
44	49	} elseif ($ch === '#') {
45	1	$this->pos++;
46		while (
47	1	$this->pos < strlen($this->source) &&
48	1	($code = ord($this->source[$this->pos])) &&
49	1	$code !== 10 && $code !== 13 && $code !== 0x2028 && $code !== 0x2029
50		) {
51	1	$this->pos++;
52		}
53	49	} elseif ($ch === "\r") {
54		$this->pos++;
55		if ($this->source[$this->pos] === "\n") {
56		$this->pos++;
57		}
58		$this->line++;
59		$this->lineStart = $this->pos;
60	49	} elseif ($ch === "\n") {
61	21	$this->pos++;
62	21	$this->line++;
63	21	$this->lineStart = $this->pos;
64		} else {
65	49	break;
66		}
67		}
68	49	}
69
70		/**
71		* @return Token
72		*/
73	49	protected function scan()
74		{
75	49	if ($this->pos >= strlen($this->source)) {
76	39	return new Token(Token::TYPE_END);
77		}
78
79	49	$ch = $this->source[$this->pos];
80		switch ($ch) {
81	49	case Token::TYPE_LPAREN:
82	24	++$this->pos;
83
84	24	return new Token(Token::TYPE_LPAREN);
85	49	case Token::TYPE_RPAREN:
86	19	++$this->pos;
87
88	19	return new Token(Token::TYPE_RPAREN);
89	49	case Token::TYPE_LBRACE:
90	47	++$this->pos;
91
92	47	return new Token(Token::TYPE_LBRACE);
93	49	case Token::TYPE_RBRACE:
94	39	++$this->pos;
95
96	39	return new Token(Token::TYPE_RBRACE);
97	48	case Token::TYPE_LT:
98	1	++$this->pos;
99
100	1	return new Token(Token::TYPE_LT);
101	48	case Token::TYPE_GT:
102		++$this->pos;
103
104		return new Token(Token::TYPE_GT);
105	48	case Token::TYPE_AMP:
106		++$this->pos;
107
108		return new Token(Token::TYPE_AMP);
109	48	case Token::TYPE_COMMA:
110	26	++$this->pos;
111
112	26	return new Token(Token::TYPE_COMMA);
113	48	case Token::TYPE_LSQUARE_BRACE:
114	4	++$this->pos;
115
116	4	return new Token(Token::TYPE_LSQUARE_BRACE);
117	48	case Token::TYPE_RSQUARE_BRACE:
118	3	++$this->pos;
119
120	3	return new Token(Token::TYPE_RSQUARE_BRACE);
121	48	case Token::TYPE_COLON:
122	29	++$this->pos;
123
124	29	return new Token(Token::TYPE_COLON);
125
126	48	case Token::TYPE_POINT:
127	8	if ($this->checkFragment()) {
128	8	return new Token(Token::TYPE_FRAGMENT_REFERENCE);
129		}
130
131		break;
132
133	48	case Token::TYPE_VARIABLE:
134	7	++$this->pos;
135
136	7	return new Token(Token::TYPE_VARIABLE);
137		}
138
139	48	if ($ch === '_' \|\| 'a' <= $ch && $ch <= 'z' \|\| 'A' <= $ch && $ch <= 'Z') {
140	48	return $this->scanWord();
141		}
142
143	15	if ($ch === '-' \|\| '0' <= $ch && $ch <= '9') {
144	10	return $this->scanNumber();
145		}
146
147	9	if ($ch === '"') {
148	9	return $this->scanString();
149		}
150
151		throw $this->createIllegal();
152		}
153
154	8	protected function checkFragment()
155		{
156	8	$this->pos++;
157	8	$ch = $this->source[$this->pos];
158
159	8	$this->pos++;
160	8	$nextCh = $this->source[$this->pos];
161
162	8	$isset = $ch == Token::TYPE_POINT && $nextCh == Token::TYPE_POINT;
163
164	8	if ($isset) {
165	8	$this->pos++;
166
167	8	return true;
168		}
169
170		return false;
171		}
172
173	48	protected function scanWord()
174		{
175	48	$start = $this->pos;
176	48	$this->pos++;
177
178	48	while ($this->pos < strlen($this->source)) {
179	48	$ch = $this->source[$this->pos];
180
181	48	if ($ch === '_' \|\| $ch === '$' \|\| 'a' <= $ch && $ch <= ('z') \|\| 'A' <= $ch && $ch <= 'Z' \|\| '0' <= $ch && $ch <= '9') {
182	48	$this->pos++;
183		} else {
184	47	break;
185		}
186		}
187
188	48	$value = substr($this->source, $start, $this->pos - $start);
189
190	48	return new Token($this->getKeyword($value), $value);
191		}
192
193	48	protected function getKeyword($name)
194		{
195		switch ($name) {
196	48	case 'null':
197	2	return Token::TYPE_NULL;
198
199	48	case 'true':
200	2	return Token::TYPE_TRUE;
201
202	48	case 'false':
203	1	return Token::TYPE_FALSE;
204
205	48	case 'query':
206	16	return Token::TYPE_QUERY;
207
208	47	case 'fragment':
209	3	return Token::TYPE_FRAGMENT;
210
211	47	case 'mutation':
212	5	return Token::TYPE_MUTATION;
213
214	47	case 'on':
215	6	return Token::TYPE_ON;
216		}
217
218	47	return Token::TYPE_IDENTIFIER;
219		}
220
221	10	protected function scanNumber()
222		{
223	10	$start = $this->pos;
224	10	if ($this->source[$this->pos] === '-') {
225	1	++$this->pos;
226		}
227
228	10	$this->skipInteger();
229
230	10	if ($this->source[$this->pos] === '.') {
231	1	$this->pos++;
232	1	$this->skipInteger();
233		}
234
235	10	$value = substr($this->source, $start, $this->pos - $start);
236
237	10	if (strpos($value, '.') === false) {
238	10	$value = (int)$value;
239		} else {
240	1	$value = (float)$value;
241		}
242
243	10	return new Token(Token::TYPE_NUMBER, $value);
244		}
245
246	10	protected function skipInteger()
247		{
248	10	$start = $this->pos;
249
250	10	while ($this->pos < strlen($this->source)) {
251	10	$ch = $this->source[$this->pos];
252	10	if ('0' <= $ch && $ch <= '9') {
253	10	$this->pos++;
254		} else {
255	10	break;
256		}
257		}
258
259	10	if ($this->pos - $start === 0) {
260		throw $this->createIllegal();
261		}
262	10	}
263
264		protected function createIllegal()
265		{
266		return $this->pos < strlen($this->source)
267		? $this->createError("Unexpected {$this->source[$this->pos]}")
268		: $this->createError('Unexpected end of input');
269		}
270
271	1	protected function createError($message)
272		{
273	1	return new SyntaxErrorException($message . " ({$this->line}:{$this->getColumn()})");
274		}
275
276	1	protected function getColumn()
277		{
278	1	return $this->pos - $this->lineStart;
279		}
280
281	9	protected function scanString()
282		{
283	9	$this->pos++;
284
285	9	$value = '';
286	9	while ($this->pos < strlen($this->source)) {
287	9	$ch = $this->source[$this->pos];
288	9	if ($ch === '"' && $this->source[$this->pos - 1] != '\\') {
289	9	$this->pos++;
290
291	9	return new Token(Token::TYPE_STRING, $value);
292		}
293
294	9	$value .= $ch;
295	9	$this->pos++;
296		}
297
298		throw $this->createIllegal();
299		}
300
301	49	protected function end()
302		{
303	49	return $this->lookAhead->getType() === Token::TYPE_END;
304		}
305
306	49	protected function peek()
307		{
308	49	return $this->lookAhead;
309		}
310
311	48	protected function lex()
312		{
313	48	$prev = $this->lookAhead;
314	48	$this->lookAhead = $this->next();
315
316	48	return $prev;
317		}
318
319	6	protected function createUnexpected(Token $token)
320		{
321	6	switch ($token->getType()) {
322	6	case Token::TYPE_END:
323		return $this->createError('Unexpected end of input');
324	6	case Token::TYPE_NUMBER:
325		return $this->createError('Unexpected number');
326	6	case Token::TYPE_STRING:
327	1	return $this->createError('Unexpected string');
328	5	case Token::TYPE_IDENTIFIER:
329		return $this->createError('Unexpected identifier');
330		}
331
332	5	return new SyntaxErrorException('Unexpected token');
333		}
334		}
335

Youshido / GraphQL

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Tokenizer::lex() A

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