Tokenizer::checkFragment() - Code Metrics - Inspection of "versions" - Youshido/GraphQL - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( d52ee7...e7842c )

by Alexandr

created 2016-05-21 01:15 UTC

Tokenizer::checkFragment() A

↳ Parent: Tokenizer

Complexity

Conditions	3
Paths	4

Size

Total Lines	18
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	10
CRAP Score	3

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	18
rs	9.4285
ccs	10
cts	10
cp	1
cc	3
eloc	10
nc	4
nop	0
crap	3

<?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;

    protected function initTokenizer($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_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_REQUIRED:
                ++$this->pos;

                return new Token(Token::TYPE_REQUIRED);
            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);
                } else {
                    return new Token(Token::TYPE_POINT);
                }

            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->createException('Can\t recognize token type');
    }

    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 expect($type)
    {
        if ($this->match($type)) {
            return $this->lex();
        }

        throw $this->createUnexpectedException($this->peek());
    }

    protected function match($type)
    {
        return $this->peek()->getType() === $type;
    }

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

        $this->skipInteger();

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

    protected function createException($message)
    {
        return new SyntaxErrorException(sprintf('%s at (%s:%s)', $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->createUnexpectedTokenTypeException(Token::TYPE_END);
    }

    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 createUnexpectedException(Token $token)
    {
        return $this->createUnexpectedTokenTypeException($token->getType());
    }

    protected function createUnexpectedTokenTypeException($tokenType)
    {
        return $this->createException(sprintf('Unexpected token "%s"', Token::tokenName($tokenType)));
    }
}


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 $lookAhead;
21
22	61	protected function initTokenizer($source)
23		{
24	61	$this->source = $source;
25	61	$this->lookAhead = $this->next();
26	61	}
27
28	61	protected function next()
29		{
30	61	$this->skipWhitespace();
31
32		/** @var Token $token */
33	61	$token = $this->scan();
34
35	61	return $token;
36		}
37
38	61	protected function skipWhitespace()
39		{
40	61	while ($this->pos < strlen($this->source)) {
41	60	$ch = $this->source[$this->pos];
42	60	if ($ch === ' ' \|\| $ch === "\t") {
43	58	$this->pos++;
44	60	} elseif ($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	1	) {
51	1	$this->pos++;
52	1	}
53	60	} elseif ($ch === "\r") {
54	1	$this->pos++;
55	1	if ($this->source[$this->pos] === "\n") {
56	1	$this->pos++;
57	1	}
58	1	$this->line++;
59	1	$this->lineStart = $this->pos;
60	60	} elseif ($ch === "\n") {
61	20	$this->pos++;
62	20	$this->line++;
63	20	$this->lineStart = $this->pos;
64	20	} else {
65	60	break;
66		}
67	58	}
68	61	}
69
70		/**
71		* @return Token
72		*/
73	61	protected function scan()
74		{
75	61	if ($this->pos >= strlen($this->source)) {
76	48	return new Token(Token::TYPE_END);
77		}
78
79	60	$ch = $this->source[$this->pos];
80		switch ($ch) {
81	60	case Token::TYPE_LPAREN:
82	31	++$this->pos;
83
84	31	return new Token(Token::TYPE_LPAREN);
85	60	case Token::TYPE_RPAREN:
86	23	++$this->pos;
87
88	23	return new Token(Token::TYPE_RPAREN);
89	60	case Token::TYPE_LBRACE:
90	58	++$this->pos;
91
92	58	return new Token(Token::TYPE_LBRACE);
93	60	case Token::TYPE_RBRACE:
94	46	++$this->pos;
95
96	46	return new Token(Token::TYPE_RBRACE);
97	59	case Token::TYPE_COMMA:
98	26	++$this->pos;
99
100	26	return new Token(Token::TYPE_COMMA);
101	59	case Token::TYPE_LSQUARE_BRACE:
102	5	++$this->pos;
103
104	5	return new Token(Token::TYPE_LSQUARE_BRACE);
105	59	case Token::TYPE_RSQUARE_BRACE:
106	4	++$this->pos;
107
108	4	return new Token(Token::TYPE_RSQUARE_BRACE);
109	59	case Token::TYPE_REQUIRED:
110	1	++$this->pos;
111
112	1	return new Token(Token::TYPE_REQUIRED);
113	59	case Token::TYPE_COLON:
114	35	++$this->pos;
115
116	35	return new Token(Token::TYPE_COLON);
117
118	59	case Token::TYPE_POINT:
		0 ignored issues – show Coding Style introduced 2016-05-21 01:18 UTC by Report Bug Copy Issue Report There must be a comment when fall-through is intentional in a non-empty case body Loading history...
119	10	if ($this->checkFragment()) {
120	9	return new Token(Token::TYPE_FRAGMENT_REFERENCE);
121		} else {
122	1	return new Token(Token::TYPE_POINT);
123		}
124
125	59	case Token::TYPE_VARIABLE:
126	8	++$this->pos;
127
128	8	return new Token(Token::TYPE_VARIABLE);
129		}
130
131	59	if ($ch === '_' \|\| 'a' <= $ch && $ch <= 'z' \|\| 'A' <= $ch && $ch <= 'Z') {
132	59	return $this->scanWord();
133		}
134
135	22	if ($ch === '-' \|\| '0' <= $ch && $ch <= '9') {
136	14	return $this->scanNumber();
137		}
138
139	14	if ($ch === '"') {
140	14	return $this->scanString();
141		}
142
143	1	throw $this->createException('Can\t recognize token type');
144		}
145
146	10	protected function checkFragment()
147		{
148	10	$this->pos++;
149	10	$ch = $this->source[$this->pos];
150
151	10	$this->pos++;
152	10	$nextCh = $this->source[$this->pos];
153
154	10	$isset = $ch == Token::TYPE_POINT && $nextCh == Token::TYPE_POINT;
155
156	10	if ($isset) {
157	9	$this->pos++;
158
159	9	return true;
160		}
161
162	1	return false;
163		}
164
165	59	protected function scanWord()
166		{
167	59	$start = $this->pos;
168	59	$this->pos++;
169
170	59	while ($this->pos < strlen($this->source)) {
171	59	$ch = $this->source[$this->pos];
172
173	59	if ($ch === '_' \|\| $ch === '$' \|\| 'a' <= $ch && $ch <= ('z') \|\| 'A' <= $ch && $ch <= 'Z' \|\| '0' <= $ch && $ch <= '9') {
174	59	$this->pos++;
175	59	} else {
176	58	break;
177		}
178	59	}
179
180	59	$value = substr($this->source, $start, $this->pos - $start);
181
182	59	return new Token($this->getKeyword($value), $value);
183		}
184
185	59	protected function getKeyword($name)
186		{
187		switch ($name) {
188	59	case 'null':
189	2	return Token::TYPE_NULL;
190
191	59	case 'true':
192	3	return Token::TYPE_TRUE;
193
194	59	case 'false':
195	1	return Token::TYPE_FALSE;
196
197	59	case 'query':
198	18	return Token::TYPE_QUERY;
199
200	58	case 'fragment':
201	6	return Token::TYPE_FRAGMENT;
202
203	58	case 'mutation':
204	10	return Token::TYPE_MUTATION;
205
206	58	case 'on':
207	8	return Token::TYPE_ON;
208		}
209
210	58	return Token::TYPE_IDENTIFIER;
211		}
212
213	56	protected function expect($type)
214		{
215	56	if ($this->match($type)) {
216	56	return $this->lex();
217		}
218
219	3	throw $this->createUnexpectedException($this->peek());
220		}
221
222	59	protected function match($type)
223		{
224	59	return $this->peek()->getType() === $type;
225		}
226
227	14	protected function scanNumber()
228		{
229	14	$start = $this->pos;
230	14	if ($this->source[$this->pos] === '-') {
231	2	++$this->pos;
232	2	}
233
234	14	$this->skipInteger();
235
236	14	if (isset($this->source[$this->pos]) && $this->source[$this->pos] === '.') {
237	1	$this->pos++;
238	1	$this->skipInteger();
239	1	}
240
241	14	$value = substr($this->source, $start, $this->pos - $start);
242
243	14	if (strpos($value, '.') === false) {
244	14	$value = (int)$value;
245	14	} else {
246	1	$value = (float)$value;
247		}
248
249	14	return new Token(Token::TYPE_NUMBER, $value);
250		}
251
252	14	protected function skipInteger()
253		{
254	14	while ($this->pos < strlen($this->source)) {
255	14	$ch = $this->source[$this->pos];
256	14	if ('0' <= $ch && $ch <= '9') {
257	14	$this->pos++;
258	14	} else {
259	13	break;
260		}
261	14	}
262	14	}
263
264	10	protected function createException($message)
265		{
266	10	return new SyntaxErrorException(sprintf('%s at (%s:%s)', $message, $this->line, $this->getColumn()));
267		}
268
269	10	protected function getColumn()
270		{
271	10	return $this->pos - $this->lineStart;
272		}
273
274	14	protected function scanString()
275		{
276	14	$this->pos++;
277
278	14	$value = '';
279	14	while ($this->pos < strlen($this->source)) {
280	14	$ch = $this->source[$this->pos];
281	14	if ($ch === '"' && $this->source[$this->pos - 1] != '\\') {
282	13	$this->pos++;
283
284	13	return new Token(Token::TYPE_STRING, $value);
285		}
286
287	14	$value .= $ch;
288	14	$this->pos++;
289	14	}
290
291	1	throw $this->createUnexpectedTokenTypeException(Token::TYPE_END);
292		}
293
294	61	protected function end()
295		{
296	61	return $this->lookAhead->getType() === Token::TYPE_END;
297		}
298
299	60	protected function peek()
300		{
301	60	return $this->lookAhead;
302		}
303
304	59	protected function lex()
305		{
306	59	$prev = $this->lookAhead;
307	59	$this->lookAhead = $this->next();
308
309	59	return $prev;
310		}
311
312	8	protected function createUnexpectedException(Token $token)
313		{
314	8	return $this->createUnexpectedTokenTypeException($token->getType());
315		}
316
317	9	protected function createUnexpectedTokenTypeException($tokenType)
318		{
319	9	return $this->createException(sprintf('Unexpected token "%s"', Token::tokenName($tokenType)));
320		}
321		}
322

Youshido / GraphQL

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Tokenizer::checkFragment() A

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