ParameterSpecBuilder::guessTypeFromDefault() - Code Metrics - Inspection of "Merge pull request #8 from pinepain/new-features" - pinepain/js-sandbox - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 344583...2d30d0 )

by Bogdan

created 2017-11-06 20:27 UTC

ParameterSpecBuilder::guessTypeFromDefault() B

↳ Parent: ParameterSpecBuilder

Complexity

Conditions	5
Paths	5

Size

Total Lines	22
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	10
CRAP Score	5

Importance

Changes

Metric	Value
dl	0
loc	22
ccs	10
cts	10
cp	1
rs	8.6737
c	0
b	0
f	0
cc	5
eloc	10
nc	5
nop	1
crap	5

<?php declare(strict_types=1);

/*
 * This file is part of the pinepain/js-sandbox PHP library.
 *
 * Copyright (c) 2016-2017 Bogdan Padalko <[email protected]>
 *
 * Licensed under the MIT license: http://opensource.org/licenses/MIT
 *
 * For the full copyright and license information, please view the
 * LICENSE file that was distributed with this source or visit
 * http://opensource.org/licenses/MIT
 */


namespace Pinepain\JsSandbox\Specs\Builder;


use Pinepain\JsSandbox\Extractors\ExtractorDefinitionBuilderException;
use Pinepain\JsSandbox\Extractors\ExtractorDefinitionBuilderInterface;
use Pinepain\JsSandbox\Specs\Builder\Exceptions\ArgumentValueBuilderException;
use Pinepain\JsSandbox\Specs\Builder\Exceptions\ParameterSpecBuilderException;
use Pinepain\JsSandbox\Specs\Parameters\MandatoryParameterSpec;
use Pinepain\JsSandbox\Specs\Parameters\OptionalParameterSpec;
use Pinepain\JsSandbox\Specs\Parameters\ParameterSpecInterface;
use Pinepain\JsSandbox\Specs\Parameters\VariadicParameterSpec;


class ParameterSpecBuilder implements ParameterSpecBuilderInterface
{
    protected $regexp = '/
        ^
        (?:
            (?<rest>\.{3})
            \s*
        )?
        (?<name>[_a-z]\w*)
        \s*
        (?<nullable>\?)?
        \s*
        (?:
            \s* = \s*
            (?<default>
                (?:[+-]?[0-9]+\.?[0-9]*)    # numbers (no exponential notation)
                |
                (?:\\\'[^\\\']*\\\')        # single-quoted string
                |
                (?:\"[^\"]*\")              # double-quoted string
                |
                (?:\[\s*\])                 # empty array
                |
                (?:\{\s*\})                 # empty object
                |
                true | false | null
            )
            \s*
        )?
        (?:
            \s*
            \:
            \s*
            (?<type>([\w\-]*(?:\(.*\))?(?:\[\s*\])?)(?:\s*\|\s*(?-1))*)
            \s*
        )?
        $
        /xi';
    /**
     * @var ExtractorDefinitionBuilderInterface
     */
    private $extractor;
    /**
     * @var ArgumentValueBuilderInterface
     */
    private $argument;

    /**
     * @param ExtractorDefinitionBuilderInterface $extractor
     * @param ArgumentValueBuilderInterface $argument
     */
    public function __construct(ExtractorDefinitionBuilderInterface $extractor, ArgumentValueBuilderInterface $argument)
    {
        $this->extractor = $extractor;
        $this->argument  = $argument;
    }

    /**
     * @param string $definition
     *
     * @return ParameterSpecInterface
     * @throws ParameterSpecBuilderException
     */
    public function build(string $definition): ParameterSpecInterface
    {
        $definition = trim($definition);

        if (!$definition) {
            throw new ParameterSpecBuilderException('Definition must be non-empty string');
        }

        if (preg_match($this->regexp, $definition, $matches)) {

            $matches = $this->prepareDefinition($matches);

            try {
                if ($this->hasRest($matches)) {
                    return $this->buildVariadicParameterSpec($matches);
                }

                if ($this->hasDefault($matches)) {
                    return $this->buildOptionalParameterSpec($matches, $matches['default']);
                }

                if ($this->hasNullable($matches)) {
                    return $this->buildOptionalParameterSpec($matches, null);
                }

                return $this->buildMandatoryParameterSpec($matches);
            } catch (ExtractorDefinitionBuilderException $e) {
                throw new ParameterSpecBuilderException("Unable to parse definition because of extractor failure: " . $e->getMessage());
            }
        }

        throw new ParameterSpecBuilderException("Unable to parse definition: '{$definition}'");
    }

    protected function buildVariadicParameterSpec(array $matches): VariadicParameterSpec
    {
        return new VariadicParameterSpec($matches['name'], $this->extractor->build($matches['type']));
    }

    protected function buildOptionalParameterSpec(array $matches, ?string $default): OptionalParameterSpec
    {
        if (null !== $default) {
            $default_definition = $matches['default'];
            try {
                $default = $this->argument->build($default_definition, false);
            } catch (ArgumentValueBuilderException $e) {
                throw new ParameterSpecBuilderException("Unknown or unsupported default value format '{$default_definition}'");
            }

            if (!$this->hasType($matches)) {
                $matches['type'] = $this->guessTypeFromDefault($default);
            }
        }

        if ($this->hasNullable($matches)) {
            // nullable means that null is a valid value and thus we should explicitly enable null extractor here
            $matches['type'] = 'null|' . $matches['type'];
        }

        return new OptionalParameterSpec($matches['name'], $this->extractor->build($matches['type']), $default);
    }

    protected function buildMandatoryParameterSpec(array $matches): MandatoryParameterSpec
    {
        return new MandatoryParameterSpec($matches['name'], $this->extractor->build($matches['type']));
    }

    protected function prepareDefinition(array $matches): array
    {
        if ($this->hasNullable($matches) && $this->hasRest($matches)) {
            throw new ParameterSpecBuilderException("Variadic parameter could not be nullable");
        }

        if ($this->hasNullable($matches) && $this->hasDefault($matches)) {
            throw new ParameterSpecBuilderException("Nullable parameter could not have default value");
        }

        if ($this->hasRest($matches) && $this->hasDefault($matches)) {
            throw new ParameterSpecBuilderException('Variadic parameter could have no default value');
        }

        if (!$this->hasDefault($matches) && !$this->hasType($matches)) {
            // special case when no default value set and no type provided
            $matches['type'] = 'any';
        }

        return $matches;
    }

    private function hasType(array $matches): bool
    {
        return isset($matches['type']) && '' !== $matches['type'];
    }

    private function hasNullable(array $matches): bool
    {
        return isset($matches['nullable']) && '' !== $matches['nullable'];
    }

    private function hasRest(array $matches): bool
    {
        return isset($matches['rest']) && '' !== $matches['rest'];
    }

    private function hasDefault(array $matches): bool
    {
        return isset($matches['default']) && '' !== $matches['default'];
    }

    private function guessTypeFromDefault($default): string
    {
        if (is_array($default)) {
            return '[]';
        }

        if (is_numeric($default)) {
            return 'number';
        }

        if (is_bool($default)) {
            return 'bool';
        }

        if (is_string($default)) {
            return 'string';
        }

        // it looks like we have nullable parameter which could be anything

        return 'any';
    }
}


1		<?php declare(strict_types=1);
2
3		/*
4		* This file is part of the pinepain/js-sandbox PHP library.
5		*
6		* Copyright (c) 2016-2017 Bogdan Padalko <[email protected]>
7		*
8		* Licensed under the MIT license: http://opensource.org/licenses/MIT
9		*
10		* For the full copyright and license information, please view the
11		* LICENSE file that was distributed with this source or visit
12		* http://opensource.org/licenses/MIT
13		*/
14
15
16		namespace Pinepain\JsSandbox\Specs\Builder;
17
18
19		use Pinepain\JsSandbox\Extractors\ExtractorDefinitionBuilderException;
20		use Pinepain\JsSandbox\Extractors\ExtractorDefinitionBuilderInterface;
21		use Pinepain\JsSandbox\Specs\Builder\Exceptions\ArgumentValueBuilderException;
22		use Pinepain\JsSandbox\Specs\Builder\Exceptions\ParameterSpecBuilderException;
23		use Pinepain\JsSandbox\Specs\Parameters\MandatoryParameterSpec;
24		use Pinepain\JsSandbox\Specs\Parameters\OptionalParameterSpec;
25		use Pinepain\JsSandbox\Specs\Parameters\ParameterSpecInterface;
26		use Pinepain\JsSandbox\Specs\Parameters\VariadicParameterSpec;
27
28
29		class ParameterSpecBuilder implements ParameterSpecBuilderInterface
30		{
31		protected $regexp = '/
32		^
33		(?:
34		(?<rest>\.{3})
35		\s*
36		)?
37		(?<name>[_a-z]\w*)
38		\s*
39		(?<nullable>\?)?
40		\s*
41		(?:
42		\s* = \s*
43		(?<default>
44		(?:[+-]?[0-9]+\.?[0-9]*) # numbers (no exponential notation)
45		\|
46		(?:\\\'[^\\\']*\\\') # single-quoted string
47		\|
48		(?:\"[^\"]*\") # double-quoted string
49		\|
50		(?:\[\s*\]) # empty array
51		\|
52		(?:\{\s*\}) # empty object
53		\|
54		true \| false \| null
55		)
56		\s*
57		)?
58		(?:
59		\s*
60		\:
61		\s*
62		(?<type>([\w\-](?:\(.\))?(?:\[\s\])?)(?:\s\\|\s(?-1)))
63		\s*
64		)?
65		$
66		/xi';
67		/**
68		* @var ExtractorDefinitionBuilderInterface
69		*/
70		private $extractor;
71		/**
72		* @var ArgumentValueBuilderInterface
73		*/
74		private $argument;
75
76		/**
77		* @param ExtractorDefinitionBuilderInterface $extractor
78		* @param ArgumentValueBuilderInterface $argument
79		*/
80	23	public function __construct(ExtractorDefinitionBuilderInterface $extractor, ArgumentValueBuilderInterface $argument)
81		{
82	23	$this->extractor = $extractor;
83	23	$this->argument = $argument;
84	23	}
85
86		/**
87		* @param string $definition
88		*
89		* @return ParameterSpecInterface
90		* @throws ParameterSpecBuilderException
91		*/
92	23	public function build(string $definition): ParameterSpecInterface
93		{
94	23	$definition = trim($definition);
95
96	23	if (!$definition) {
97	1	throw new ParameterSpecBuilderException('Definition must be non-empty string');
98		}
99
100	22	if (preg_match($this->regexp, $definition, $matches)) {
101
102	21	$matches = $this->prepareDefinition($matches);
103
104		try {
105	18	if ($this->hasRest($matches)) {
106	1	return $this->buildVariadicParameterSpec($matches);
107		}
108
109	17	if ($this->hasDefault($matches)) {
110	9	return $this->buildOptionalParameterSpec($matches, $matches['default']);
111		}
112
113	8	if ($this->hasNullable($matches)) {
114	2	return $this->buildOptionalParameterSpec($matches, null);
115		}
116
117	6	return $this->buildMandatoryParameterSpec($matches);
118	2	} catch (ExtractorDefinitionBuilderException $e) {
119	1	throw new ParameterSpecBuilderException("Unable to parse definition because of extractor failure: " . $e->getMessage());
120		}
121		}
122
123	1	throw new ParameterSpecBuilderException("Unable to parse definition: '{$definition}'");
124		}
125
126	1	protected function buildVariadicParameterSpec(array $matches): VariadicParameterSpec
127		{
128	1	return new VariadicParameterSpec($matches['name'], $this->extractor->build($matches['type']));
129		}
130
131	11	protected function buildOptionalParameterSpec(array $matches, ?string $default): OptionalParameterSpec
132		{
133	11	if (null !== $default) {
134	9	$default_definition = $matches['default'];
135		try {
136	9	$default = $this->argument->build($default_definition, false);
137	1	} catch (ArgumentValueBuilderException $e) {
138	1	throw new ParameterSpecBuilderException("Unknown or unsupported default value format '{$default_definition}'");
139		}
140
141	8	if (!$this->hasType($matches)) {
142	8	$matches['type'] = $this->guessTypeFromDefault($default);
143		}
144		}
145
146	10	if ($this->hasNullable($matches)) {
147		// nullable means that null is a valid value and thus we should explicitly enable null extractor here
148	2	$matches['type'] = 'null\|' . $matches['type'];
149		}
150
151	10	return new OptionalParameterSpec($matches['name'], $this->extractor->build($matches['type']), $default);
152		}
153
154	6	protected function buildMandatoryParameterSpec(array $matches): MandatoryParameterSpec
155		{
156	6	return new MandatoryParameterSpec($matches['name'], $this->extractor->build($matches['type']));
157		}
158
159	21	protected function prepareDefinition(array $matches): array
160		{
161	21	if ($this->hasNullable($matches) && $this->hasRest($matches)) {
162	1	throw new ParameterSpecBuilderException("Variadic parameter could not be nullable");
163		}
164
165	20	if ($this->hasNullable($matches) && $this->hasDefault($matches)) {
166	1	throw new ParameterSpecBuilderException("Nullable parameter could not have default value");
167		}
168
169	19	if ($this->hasRest($matches) && $this->hasDefault($matches)) {
170	1	throw new ParameterSpecBuilderException('Variadic parameter could have no default value');
171		}
172
173	18	if (!$this->hasDefault($matches) && !$this->hasType($matches)) {
174		// special case when no default value set and no type provided
175	2	$matches['type'] = 'any';
176		}
177
178	18	return $matches;
179		}
180
181	17	private function hasType(array $matches): bool
182		{
183	17	return isset($matches['type']) && '' !== $matches['type'];
184		}
185
186	21	private function hasNullable(array $matches): bool
187		{
188	21	return isset($matches['nullable']) && '' !== $matches['nullable'];
189		}
190
191	21	private function hasRest(array $matches): bool
192		{
193	21	return isset($matches['rest']) && '' !== $matches['rest'];
194		}
195
196	20	private function hasDefault(array $matches): bool
197		{
198	20	return isset($matches['default']) && '' !== $matches['default'];
199		}
200
201	8	private function guessTypeFromDefault($default): string
202		{
203	8	if (is_array($default)) {
204	1	return '[]';
205		}
206
207	7	if (is_numeric($default)) {
208	2	return 'number';
209		}
210
211	5	if (is_bool($default)) {
212	2	return 'bool';
213		}
214
215	3	if (is_string($default)) {
216	2	return 'string';
217		}
218
219		// it looks like we have nullable parameter which could be anything
220
221	1	return 'any';
222		}
223		}
224

pinepain / js-sandbox

Push — master ( 344583...2d30d0 )

ParameterSpecBuilder::guessTypeFromDefault() B

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