Parser::parseIdentifier() - Code Metrics - Inspection of "- add ability for parser to parse typed fragment" - Youshido/GraphQL - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 325209...de8c12 )

by Portey

created 2015-12-16 11:51 UTC

Parser::parseIdentifier() A

↳ Parent: Parser

Complexity

Conditions	1
Paths	1

Size

Total Lines	9
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	1

Importance

Changes	3
Bugs	0	Features	1

Metric	Value
c	3
b	0
f	1
dl	0
loc	9
ccs	7
cts	7
cp	1
rs	9.6667
cc	1
eloc	7
nc	1
nop	0
crap	1

<?php
/*
* This file is a part of graphql-youshido project.
*
* @author Portey Vasil <[email protected]>
* created: 11/23/15 1:22 AM
*/

namespace Youshido\GraphQL\Parser;

use Youshido\GraphQL\Parser\Ast\TypedFragment;
use Youshido\GraphQL\Parser\Ast\TypedFragmentReference;
use Youshido\GraphQL\Parser\Value\InputList;
use Youshido\GraphQL\Parser\Ast\Argument;
use Youshido\GraphQL\Parser\Ast\Field;
use Youshido\GraphQL\Parser\Ast\Fragment;
use Youshido\GraphQL\Parser\Ast\FragmentReference;
use Youshido\GraphQL\Parser\Value\InputObject;
use Youshido\GraphQL\Parser\Value\Literal;
use Youshido\GraphQL\Parser\Ast\Mutation;
use Youshido\GraphQL\Parser\Ast\Query;
use Youshido\GraphQL\Parser\Value\Variable;

class Parser extends Tokenizer
{

    public function parse()
    {
        $data = ['queries' => [], 'mutations' => [], 'fragments' => []];

        while (!$this->end()) {
            $tokenType = $this->peek()->getType();

            switch ($tokenType) {
                case Token::TYPE_LBRACE:
                case Token::TYPE_QUERY:
                    $data = array_merge($data, ['queries' => $this->parseBody()]);
                    break;

                case Token::TYPE_MUTATION:
                    $data = array_merge($data, ['mutations' => $this->parseBody(Token::TYPE_MUTATION)]);
                    break;

                case Token::TYPE_FRAGMENT:
                    $data['fragments'][] = $this->parseFragment();
                    break;

                default:
                    throw new SyntaxErrorException();
            }
        }

        return $data;
    }

    protected function parseBody($token = Token::TYPE_QUERY, $highLevel = true)
    {
        $fields = [];
        $first  = true;

        if ($this->peek()->getType() == $token) {
            $this->lex();
            $this->eat(Token::TYPE_IDENTIFIER);
        }

        $this->lex();

        while (!$this->match(Token::TYPE_RBRACE) && !$this->end()) {
            if ($first) {
                $first = false;
            } else {
                $this->expect(Token::TYPE_COMMA);
            }

            if ($this->match(Token::TYPE_FRAGMENT_REFERENCE)) {
                $this->lex();

                if ($this->eat(Token::TYPE_ON)) {
                    $fields[] = $this->parseBodyItem(Token::TYPE_TYPED_FRAGMENT, $highLevel);
                } else {
                    $fields[] = $this->parseFragmentReference();
                }
            } else {
                $fields[] = $this->parseBodyItem($token, $highLevel);
            }
        }

        $this->expect(Token::TYPE_RBRACE);

        return $fields;
    }

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

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

    protected function expectMulti($types)
    {
        if ($this->matchMulti($types)) {
            return $this->lex();
        }

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

    protected function parseReference()
    {
        $this->expectMulti([Token::TYPE_AMP, Token::TYPE_VARIABLE]);

        if ($this->match(Token::TYPE_NUMBER) || $this->match(Token::TYPE_IDENTIFIER)) {
            return new Variable($this->lex()->getData());
        }

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

    protected function parseFragmentReference()
    {
        $name = $this->parseIdentifier();

        return new FragmentReference($name);
    }

    protected function parseIdentifier()
    {
        return $this->expectMulti([
            Token::TYPE_IDENTIFIER,
            Token::TYPE_MUTATION,
            Token::TYPE_QUERY,
            Token::TYPE_FRAGMENT,
        ])->getData();
    }

    protected function parseBodyItem($type = Token::TYPE_QUERY, $highLevel = true)
    {
        $name  = $this->parseIdentifier();
        $alias = null;

        if ($this->eat(Token::TYPE_COLON)) {
            $alias = $name;
            $name  = $this->parseIdentifier();
        }

        $arguments = $this->match(Token::TYPE_LPAREN) ? $this->parseArgumentList() : [];

        if ($this->match(Token::TYPE_LBRACE)) {
            $fields = $this->parseBody($type, false);

            if ($type == Token::TYPE_QUERY) {
                return new Query($name, $alias, $arguments, $fields);
            } elseif ($type == Token::TYPE_TYPED_FRAGMENT) {
                return new TypedFragmentReference($name, $fields);
            } else {
                return new Mutation($name, $alias, $arguments, $fields);
            }
        } else {
            if ($highLevel && $type == Token::TYPE_MUTATION) {
                return new Mutation($name, $alias, $arguments);
            }

            return new Field($name, $alias);
        }
    }

    protected function parseArgumentList()
    {
        $args  = [];
        $first = true;

        $this->expect(Token::TYPE_LPAREN);

        while (!$this->match(Token::TYPE_RPAREN) && !$this->end()) {
            if ($first) {
                $first = false;
            } else {
                $this->expect(Token::TYPE_COMMA);
            }

            $args[] = $this->parseArgument();
        }

        $this->expect(Token::TYPE_RPAREN);

        return $args;
    }

    protected function parseArgument()
    {
        $name = $this->parseIdentifier();
        $this->expect(Token::TYPE_COLON);
        $value = $this->parseValue();

        return new Argument($name, $value);
    }

    protected function parseValue()
    {
        switch ($this->lookAhead->getType()) {
            case Token::TYPE_LSQUARE_BRACE:
                return $this->parseList();

            case Token::TYPE_LBRACE:
                return $this->parseObject();

            case Token::TYPE_AMP:
            case Token::TYPE_VARIABLE:
                return $this->parseReference();

            case Token::TYPE_LT:
                return $this->parseVariable();

            case Token::TYPE_NUMBER:
            case Token::TYPE_STRING:
            case Token::TYPE_IDENTIFIER:
                return new Literal($this->lex()->getData());

            case Token::TYPE_NULL:
            case Token::TYPE_TRUE:
            case Token::TYPE_FALSE:
                return new Literal($this->lex()->getData());
        }

        throw $this->createUnexpected($this->lookAhead);
    }

    protected function parseList($createType = true)
    {
        $this->eat(Token::TYPE_LSQUARE_BRACE);

        $list = [];
        while (!$this->match(Token::TYPE_RSQUARE_BRACE) && !$this->end()) {
            $list[] = $this->parseListValue();

            if ($this->lookAhead->getType() != Token::TYPE_RSQUARE_BRACE) {
                $this->expect(Token::TYPE_COMMA);
            }
        }

        $this->expect(Token::TYPE_RSQUARE_BRACE);

        return $createType ? new InputList($list) : $list;
    }

    protected function parseListValue()
    {
        switch ($this->lookAhead->getType()) {
            case Token::TYPE_NUMBER:
                return $this->expect(Token::TYPE_NUMBER)->getData();

            case Token::TYPE_STRING:
                return $this->expect(Token::TYPE_STRING)->getData();

            case Token::TYPE_LBRACE:
                return $this->parseObject(false);

            case Token::TYPE_LSQUARE_BRACE:
                return $this->parseList(false);

            case Token::TYPE_TRUE:
                return $this->expect(Token::TYPE_TRUE)->getData();

            case Token::TYPE_FALSE:
                return $this->expect(Token::TYPE_FALSE)->getData();

            case Token::TYPE_NULL:
                return $this->expect(Token::TYPE_NULL)->getData();
        }

        throw new SyntaxErrorException('Can\'t parse argument');
    }

    protected function parseObject($createType = true)
    {
        $this->eat(Token::TYPE_LBRACE);

        $object = [];
        while (!$this->match(Token::TYPE_RBRACE) && !$this->end()) {
            $key = $this->expect(Token::TYPE_STRING)->getData();
            $this->expect(Token::TYPE_COLON);
            $value = $this->parseListValue();

            if ($this->peek()->getType() != Token::TYPE_RBRACE) {
                $this->expect(Token::TYPE_COMMA);
            }

            $object[$key] = $value;
        }

        $this->eat(Token::TYPE_RBRACE);

        return $createType ? new InputObject($object) : $object;
    }

    protected function parseVariable()
    {
        $this->expect(Token::TYPE_LT);
        $name = $this->expect(Token::TYPE_IDENTIFIER)->getData();
        $this->expect(Token::TYPE_GT);

        return new Variable($name);
    }

    protected function parseFragment()
    {
        $this->lex();
        $name = $this->parseIdentifier();

        $this->eat(Token::TYPE_ON);

        $model  = $this->parseIdentifier();
        $fields = $this->parseBody();

        return new Fragment($name, $model, $fields);
    }

    protected function eat($type)
    {
        if ($this->match($type)) {
            return $this->lex();
        }

        return null;
    }

    protected function matchMulti($types)
    {
        foreach ($types as $type) {
            if ($this->peek()->getType() == $type) {
                return true;
            }
        }

        return false;
    }

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

1		<?php
2		/*
3		* This file is a part of graphql-youshido project.
4		*
5		* @author Portey Vasil <[email protected]>
6		* created: 11/23/15 1:22 AM
7		*/
8
9		namespace Youshido\GraphQL\Parser;
10
11		use Youshido\GraphQL\Parser\Ast\TypedFragment;
12		use Youshido\GraphQL\Parser\Ast\TypedFragmentReference;
13		use Youshido\GraphQL\Parser\Value\InputList;
14		use Youshido\GraphQL\Parser\Ast\Argument;
15		use Youshido\GraphQL\Parser\Ast\Field;
16		use Youshido\GraphQL\Parser\Ast\Fragment;
17		use Youshido\GraphQL\Parser\Ast\FragmentReference;
18		use Youshido\GraphQL\Parser\Value\InputObject;
19		use Youshido\GraphQL\Parser\Value\Literal;
20		use Youshido\GraphQL\Parser\Ast\Mutation;
21		use Youshido\GraphQL\Parser\Ast\Query;
22		use Youshido\GraphQL\Parser\Value\Variable;
23
24		class Parser extends Tokenizer
25		{
26
27	40	public function parse()
28		{
29	40	$data = ['queries' => [], 'mutations' => [], 'fragments' => []];
30
31	40	while (!$this->end()) {
32	40	$tokenType = $this->peek()->getType();
33
34		switch ($tokenType) {
35	40	case Token::TYPE_LBRACE:
36	40	case Token::TYPE_QUERY:
37	34	$data = array_merge($data, ['queries' => $this->parseBody()]);
38	28	break;
39
40	7	case Token::TYPE_MUTATION:
41	5	$data = array_merge($data, ['mutations' => $this->parseBody(Token::TYPE_MUTATION)]);
42	3	break;
43
44	2	case Token::TYPE_FRAGMENT:
45	1	$data['fragments'][] = $this->parseFragment();
46	1	break;
47
48	1	default:
49	1	throw new SyntaxErrorException();
50	1	}
51	31	}
52
53	31	return $data;
54		}
55
56	39	protected function parseBody($token = Token::TYPE_QUERY, $highLevel = true)
57		{
58	39	$fields = [];
59	39	$first = true;
60
61	39	if ($this->peek()->getType() == $token) {
62	11	$this->lex();
63	11	$this->eat(Token::TYPE_IDENTIFIER);
64	11	}
65
66	39	$this->lex();
67
68	39	while (!$this->match(Token::TYPE_RBRACE) && !$this->end()) {
69	36	if ($first) {
70	36	$first = false;
71	36	} else {
72	14	$this->expect(Token::TYPE_COMMA);
73		}
74
75	36	if ($this->match(Token::TYPE_FRAGMENT_REFERENCE)) {
76	2	$this->lex();
77
78	2	if ($this->eat(Token::TYPE_ON)) {
79	1	$fields[] = $this->parseBodyItem(Token::TYPE_TYPED_FRAGMENT, $highLevel);
80	1	} else {
81	1	$fields[] = $this->parseFragmentReference();
82		}
83	2	} else {
84	36	$fields[] = $this->parseBodyItem($token, $highLevel);
85		}
86	31	}
87
88	32	$this->expect(Token::TYPE_RBRACE);
89
90	32	return $fields;
91		}
92
93	39	protected function expect($type)
94		{
95	39	if ($this->match($type)) {
96	39	return $this->lex();
97		}
98
99	3	throw $this->createUnexpected($this->peek());
100		}
101
102	36	protected function expectMulti($types)
103		{
104	36	if ($this->matchMulti($types)) {
105	36	return $this->lex();
106		}
107
108	2	throw $this->createUnexpected($this->peek());
109		}
110
111	4	protected function parseReference()
112		{
113	4	$this->expectMulti([Token::TYPE_AMP, Token::TYPE_VARIABLE]);
114
115	4	if ($this->match(Token::TYPE_NUMBER) \|\| $this->match(Token::TYPE_IDENTIFIER)) {
116	3	return new Variable($this->lex()->getData());
117		}
118
119	1	throw $this->createUnexpected($this->peek());
120		}
121
122	1	protected function parseFragmentReference()
123		{
124	1	$name = $this->parseIdentifier();
125
126	1	return new FragmentReference($name);
127		}
128
129	36	protected function parseIdentifier()
130		{
131	36	return $this->expectMulti([
132	36	Token::TYPE_IDENTIFIER,
133	36	Token::TYPE_MUTATION,
134	36	Token::TYPE_QUERY,
135	36	Token::TYPE_FRAGMENT,
136	36	])->getData();
137		}
138
139	36	protected function parseBodyItem($type = Token::TYPE_QUERY, $highLevel = true)
140		{
141	36	$name = $this->parseIdentifier();
142	36	$alias = null;
143
144	36	if ($this->eat(Token::TYPE_COLON)) {
145	9	$alias = $name;
146	9	$name = $this->parseIdentifier();
147	9	}
148
149	36	$arguments = $this->match(Token::TYPE_LPAREN) ? $this->parseArgumentList() : [];
150
151	31	if ($this->match(Token::TYPE_LBRACE)) {
152	29	$fields = $this->parseBody($type, false);
153
154	27	if ($type == Token::TYPE_QUERY) {
155	26	return new Query($name, $alias, $arguments, $fields);
156	2	} elseif ($type == Token::TYPE_TYPED_FRAGMENT) {
157	1	return new TypedFragmentReference($name, $fields);
158		} else {
159	1	return new Mutation($name, $alias, $arguments, $fields);
160		}
161		} else {
162	31	if ($highLevel && $type == Token::TYPE_MUTATION) {
163	2	return new Mutation($name, $alias, $arguments);
164		}
165
166	29	return new Field($name, $alias);
167		}
168		}
169
170	19	protected function parseArgumentList()
171		{
172	19	$args = [];
173	19	$first = true;
174
175	19	$this->expect(Token::TYPE_LPAREN);
176
177	19	while (!$this->match(Token::TYPE_RPAREN) && !$this->end()) {
178	19	if ($first) {
179	19	$first = false;
180	19	} else {
181	3	$this->expect(Token::TYPE_COMMA);
182		}
183
184	19	$args[] = $this->parseArgument();
185	14	}
186
187	14	$this->expect(Token::TYPE_RPAREN);
188
189	14	return $args;
190		}
191
192	19	protected function parseArgument()
193		{
194	19	$name = $this->parseIdentifier();
195	19	$this->expect(Token::TYPE_COLON);
196	19	$value = $this->parseValue();
197
198	14	return new Argument($name, $value);
199		}
200
201	19	protected function parseValue()
202		{
203	19	switch ($this->lookAhead->getType()) {
204	19	case Token::TYPE_LSQUARE_BRACE:
205	3	return $this->parseList();
206
207	16	case Token::TYPE_LBRACE:
208	3	return $this->parseObject();
209
210	13	case Token::TYPE_AMP:
211	13	case Token::TYPE_VARIABLE:
212	4	return $this->parseReference();
213
214	10	case Token::TYPE_LT:
215	1	return $this->parseVariable();
216
217	9	case Token::TYPE_NUMBER:
218	9	case Token::TYPE_STRING:
219	9	case Token::TYPE_IDENTIFIER:
220	8	return new Literal($this->lex()->getData());
221
222	2	case Token::TYPE_NULL:
223	2	case Token::TYPE_TRUE:
224	2	case Token::TYPE_FALSE:
225	1	return new Literal($this->lex()->getData());
226	1	}
227
228	1	throw $this->createUnexpected($this->lookAhead);
229		}
230
231	4	protected function parseList($createType = true)
232		{
233	4	$this->eat(Token::TYPE_LSQUARE_BRACE);
234
235	4	$list = [];
236	4	while (!$this->match(Token::TYPE_RSQUARE_BRACE) && !$this->end()) {
237	4	$list[] = $this->parseListValue();
238
239	3	if ($this->lookAhead->getType() != Token::TYPE_RSQUARE_BRACE) {
240	3	$this->expect(Token::TYPE_COMMA);
241	3	}
242	3	}
243
244	3	$this->expect(Token::TYPE_RSQUARE_BRACE);
245
246	3	return $createType ? new InputList($list) : $list;
247		}
248
249	6	protected function parseListValue()
250		{
251	6	switch ($this->lookAhead->getType()) {
252	6	case Token::TYPE_NUMBER:
253	5	return $this->expect(Token::TYPE_NUMBER)->getData();
254
255	4	case Token::TYPE_STRING:
256	2	return $this->expect(Token::TYPE_STRING)->getData();
257
258	4	case Token::TYPE_LBRACE:
259	1	return $this->parseObject(false);
260
261	4	case Token::TYPE_LSQUARE_BRACE:
262	1	return $this->parseList(false);
263
264	3	case Token::TYPE_TRUE:
265	1	return $this->expect(Token::TYPE_TRUE)->getData();
266
267	3	case Token::TYPE_FALSE:
268	1	return $this->expect(Token::TYPE_FALSE)->getData();
269
270	3	case Token::TYPE_NULL:
271	2	return $this->expect(Token::TYPE_NULL)->getData();
272	1	}
273
274	1	throw new SyntaxErrorException('Can\'t parse argument');
275		}
276
277	3	protected function parseObject($createType = true)
278		{
279	3	$this->eat(Token::TYPE_LBRACE);
280
281	3	$object = [];
282	3	while (!$this->match(Token::TYPE_RBRACE) && !$this->end()) {
283	3	$key = $this->expect(Token::TYPE_STRING)->getData();
284	3	$this->expect(Token::TYPE_COLON);
285	3	$value = $this->parseListValue();
286
287	3	if ($this->peek()->getType() != Token::TYPE_RBRACE) {
288	3	$this->expect(Token::TYPE_COMMA);
289	3	}
290
291	3	$object[$key] = $value;
292	3	}
293
294	1	$this->eat(Token::TYPE_RBRACE);
295
296	1	return $createType ? new InputObject($object) : $object;
297		}
298
299	1	protected function parseVariable()
300		{
301	1	$this->expect(Token::TYPE_LT);
302	1	$name = $this->expect(Token::TYPE_IDENTIFIER)->getData();
303	1	$this->expect(Token::TYPE_GT);
304
305	1	return new Variable($name);
306		}
307
308	1	protected function parseFragment()
309		{
310	1	$this->lex();
311	1	$name = $this->parseIdentifier();
312
313	1	$this->eat(Token::TYPE_ON);
314
315	1	$model = $this->parseIdentifier();
316	1	$fields = $this->parseBody();
317
318	1	return new Fragment($name, $model, $fields);
319		}
320
321	38	protected function eat($type)
322		{
323	38	if ($this->match($type)) {
324	17	return $this->lex();
325		}
326
327	37	return null;
328		}
329
330	36	protected function matchMulti($types)
331		{
332	36	foreach ($types as $type) {
333	36	if ($this->peek()->getType() == $type) {
334	36	return true;
335		}
336	7	}
337
338	2	return false;
339		}
340
341	39	protected function match($type)
342		{
343	39	return $this->peek()->getType() === $type;
344		}
345		}

Youshido / GraphQL

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Parser::parseIdentifier() A

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