ParameterJuicer::launchValidatorsFor() - Code Metrics - Inspection of "update README & tests" - chanmix51/ParameterJuicer - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( b4c757...366bee )

by grégoire

created 2017-02-10 16:58 UTC

ParameterJuicer::launchValidatorsFor() A

↳ Parent: ParameterJuicer

Complexity

Conditions	4
Paths	4

Size

Total Lines	16
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	16
c	0
b	0
f	0
rs	9.2
cc	4
eloc	9
nc	4
nop	3

<?php
/*
 * This file is part of Chanmix51’s ParameterJuicer package.
 *
 * (c) 2017 Grégoire HUBERT <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Chanmix51\ParameterJuicer;

use Chanmix51\ParameterJuicer\Exception\ValidationException;
use Chanmix51\ParameterJuicer\Exception\CleanerRemoveFieldException;
use Chanmix51\ParameterJuicer\ParameterJuicerInterface;

/**
 * ParameterJuicer
 *
 * Cleaner and validator for data set.
 *
 * A "cleaner" is a callable that takes a data and returns the data tranformed.
 * It can throw a CleanerRemoveFieldException if the field is to be unset.
 *
 * A "default value" is set when the field is NOT PRESENT. In the case the
 * field exists and has no value (null), the default value does not apply.
 *
 * A "validator" is a callable that throws a ValidationException when the given
 * data is detected as invalid.
 *
 * @package   ParameterJuicer
 * @copyright 2017 Grégoire HUBERT
 * @author    Grégoire HUBERT <[email protected]>
 * @license   X11 {@link http://opensource.org/licenses/mit-license.php}
 *
 * @see       ParameterJuicerInterface
 */
class ParameterJuicer implements ParameterJuicerInterface
{
    const STRATEGY_IGNORE_EXTRA_VALUES = 0;
    const STRATEGY_REFUSE_EXTRA_VALUES = 1;
    const STRATEGY_ACCEPT_EXTRA_VALUES = 2;

    /** @var  array     list of validators, must be callables */
    protected $validators = [];

    /** @var  array     list of cleaners, must be callables */
    protected $cleaners = [];

    /** @var  array     list of fields, this gives an information if the field
                        is mandatory or optional. */
    protected $fields = [];

    /** @var  array     list of default values */
    protected $default_values = [];

    /** @var  int       strategy of this juicer */
    public    $strategy = self::STRATEGY_IGNORE_EXTRA_VALUES;

    /**
     * getName
     *
     * @see     ParameterJuicerInterface
     */
    public function getName(): string
    {
        return 'anonymous';
    }

    /**
     * addField
     *
     * Declare a new field with no validators nor cleaner. It can be declared
     * if the field is optional or mandatory.
     * If the field already exists, it is overriden.
     */
    public function addField(string $name, bool $is_mandatory = true): self
    {
        $this->fields[$name] = $is_mandatory;

        return $this;
    }

    /**
     * addFields
     *
     * Declare several fields at once.Existing fields are overriden.
     */
    public function addFields(array $fields, $are_mandatory = true): self
    {
        array_merge($this->fields, array_fill_keys($fields, $are_mandatory));

        return $this;
    }

    /**
     * removeField
     *
     * Remove an existing field with all validators or cleaners associated to
     * it if any. It throws an exception if the field does not exist.
     *
     * @throws \InvalidArgumentException
     */
    public function removeField(string $name): self
    {
        $this->checkFieldExists($name);
        unset($this->fields[$name]);

        if (isset($this->validators[$name])) {
            unset($this->validators[$name]);
        }

        if (isset($this->cleaners[$name])) {
            unset($this->cleaners[$name]);
        }

        return $this;
    }

    /**
     * addValidator
     *
     * Add a new validator associated to a key. If the field is not already
     * declared, it is created.
     *
     * @throws \InvalidArgumentException
     */
    public function addValidator(string $name, callable $validator): self
    {
        $this
            ->checkFieldExists($name)
            ->validators[$name][] = $validator
            ;

        return $this;
    }

    /**
     * addCleaner
     *
     * Add a new cleaner associated to a key.
     *
     * @throws \InvalidArgumentException
     */
    public function addCleaner(string $name, callable $cleaner): self
    {
        $this
            ->checkFieldExists($name)
            ->cleaners[$name][] = $cleaner
            ;

        return $this;
    }

    /**
     * setDefaultValue
     *
     * Set a default value for a field. If the field is not set or its value is
     * null, this value will be set instead. This is triggered AFTER the
     * cleaners which is useful because some cleanders can return null and then
     * default value is applied.
     *
     * @throws \InvalidArgumentException
     */
    public function setDefaultValue(string $name, $value): self
    {
        $this
            ->checkFieldExists($name)
            ->default_values[$name] = $value
            ;

        return $this;
    }

    /**
     * addJuicer
     *
     * Add a juicer to clean a validate a subset of data.
     *
     * @throws \InvalidArgumentException
     */
    public function addJuicer(string $name, ParameterJuicerInterface $juicer): self
    {
        return $this
            ->addCleaner($name, [$juicer, 'clean'])
            ->addValidator($name, [$juicer, 'validate'])
            ;
    }

    /**
     * setStrategy
     *
     * Set the extra fields strategy for this juicer.
     */
    public function setStrategy(int $strategy): self
    {
        $this->strategy = $strategy;

        return $this;
    }

    /**
     * squash
     *
     * Clean & validate the given data according to the definition.
     */
    public function squash(array $values): array
    {
        $values = $this->clean($values);
        $this->validate($this->getName(), $values);

        return $values;
    }

    /**
     * validate
     *
     * Trigger validation on values.
     *
     * @see     ParameterJuicerInterface
     */
    public function validate(string $name, array $values): ParameterJuicerInterface
    {
        $exception = new ValidationException;

        if ($this->strategy === self::STRATEGY_REFUSE_EXTRA_VALUES) {
            $this->refuseExtraFields($values, $exception);
        }
        $this->validateFields($values, $exception);

        if ($exception->hasExceptions()) {
            throw $exception;
        }

        return $this;
    }

    /**
     * refuseExtraFields
     *
     * Fill the exception with refused extra fields if any.
     */
    private function refuseExtraFields(array $values, ValidationException $exception): self
    {
        $diff = array_keys(array_diff_key($values, $this->fields));

        foreach ($diff as $fied_name) {
            $exception->addException(new ValidationException(
                sprintf("Extra field '%s' is refused by validation strategy.", $fied_name)
            ));
        }

        return $this;
    }

    /**
     * validateFields
     *
     * Check mandatory fields and launch validators.
     */
    private function validateFields(array $values, ValidationException $exception): self
    {
        foreach ($this->fields as $field => $is_mandatory) {
            $is_set = isset($values[$field]) || array_key_exists($field, $values);

            if ($is_mandatory && !$is_set) {
                $exception->addException(
                    new ValidationException(
                        sprintf(
                            "Missing field '%s' is mandatory.",
                            $field
                        )
                    )
                );

            } elseif ($is_set && isset($this->validators[$field])) {
                $this->launchValidatorsFor(
                    $field,
                    $values[$field],
                    $exception
                );
            }
        }

        return $this;
    }

    /**
     * setDefaultValues
     *
     * Apply default values. When a field is not present in the values, the
     * default value is set.
     */
    private function setDefaultValues(array $values): array
    {
        foreach ($this->default_values as $field => $default_value) {
            if (!isset($values[$field]) && !array_key_exists($field, $values)) {
                $values[$field] = $default_value;
            }
        }

        return $values;
    }

    /**
     * clean
     *
     * Clean and return values.
     *
     * @see     ParameterJuicerInterface
     */
    public function clean(array $values): array
    {
        if ($this->strategy === self::STRATEGY_IGNORE_EXTRA_VALUES) {
            $values = array_intersect_key($values, $this->fields);
        }

        return $this->setDefaultValues($this->triggerCleaning($values));
    }

    /**
     * triggerCleaning
     *
     * Launch cleaners on the values.
     */
    private function triggerCleaning(array $values): array
    {
        foreach ($this->cleaners as $field_name => $cleaners) {
            if (isset($values[$field_name]) || array_key_exists($field_name, $values)) {
                foreach ($cleaners as $cleaner) {
                    try {
                        $values[$field_name] =
                            call_user_func($cleaner, $values[$field_name])
                            ;
                    } catch (CleanerRemoveFieldException $e) {
                        unset($values[$field_name]);
                    }
                }
            }
        }

        return $values;
    }

    /**
     * checkFieldExists
     *
     * Throw an exception if the field does not exist.
     *
     * @throws  \InvalidArgumentException
     */
    private function checkFieldExists(string $name): self
    {
        if (!isset($this->fields[$name])) {
            throw new \InvalidArgumentException(
                sprintf(
                    "Field '%s' is not declared, fields are {%s}.",
                    $name,
                    join(', ', array_keys($this->fields))
                )
            );
        }

        return $this;
    }

    /**
     * launchValidatorsFor
     *
     * Triger validators for the given field if any.
     *
     * @throws  \RuntimeException if the callable fails.
     */
    private function launchValidatorsFor(string $field, $value, ValidationException $exception): self
    {
        foreach ($this->validators[$field] as $validator) {
            try {
                if (call_user_func($validator, $field, $value) === false) {
                    throw new \RuntimeException(
                        sprintf("One of the validators for the field '%s' has a PHP error.", $field)
                    );
                }
            } catch (ValidationException $e) {
                $exception->addException($e);
            }
        }

        return $this;
    }
}



1			<?php
2			/*
3			* This file is part of Chanmix51’s ParameterJuicer package.
4			*
5			* (c) 2017 Grégoire HUBERT <[email protected]>
6			*
7			* For the full copyright and license information, please view the LICENSE
8			* file that was distributed with this source code.
9			*/
10			namespace Chanmix51\ParameterJuicer;
11
12			use Chanmix51\ParameterJuicer\Exception\ValidationException;
13			use Chanmix51\ParameterJuicer\Exception\CleanerRemoveFieldException;
14			use Chanmix51\ParameterJuicer\ParameterJuicerInterface;
15
16			/**
17			* ParameterJuicer
18			*
19			* Cleaner and validator for data set.
20			*
21			* A "cleaner" is a callable that takes a data and returns the data tranformed.
22			* It can throw a CleanerRemoveFieldException if the field is to be unset.
23			*
24			* A "default value" is set when the field is NOT PRESENT. In the case the
25			* field exists and has no value (null), the default value does not apply.
26			*
27			* A "validator" is a callable that throws a ValidationException when the given
28			* data is detected as invalid.
29			*
30			* @package ParameterJuicer
31			* @copyright 2017 Grégoire HUBERT
32			* @author Grégoire HUBERT <[email protected]>
33			* @license X11 {@link http://opensource.org/licenses/mit-license.php}
34			*
35			* @see ParameterJuicerInterface
36			*/
37			class ParameterJuicer implements ParameterJuicerInterface
38			{
39			const STRATEGY_IGNORE_EXTRA_VALUES = 0;
40			const STRATEGY_REFUSE_EXTRA_VALUES = 1;
41			const STRATEGY_ACCEPT_EXTRA_VALUES = 2;
42
43			/** @var array list of validators, must be callables */
44			protected $validators = [];
45
46			/** @var array list of cleaners, must be callables */
47			protected $cleaners = [];
48
49			/** @var array list of fields, this gives an information if the field
50			is mandatory or optional. */
51			protected $fields = [];
52
53			/** @var array list of default values */
54			protected $default_values = [];
55
56			/** @var int strategy of this juicer */
57			public $strategy = self::STRATEGY_IGNORE_EXTRA_VALUES;
58
59			/**
60			* getName
61			*
62			* @see ParameterJuicerInterface
63			*/
64			public function getName(): string
65			{
66			return 'anonymous';
67			}
68
69			/**
70			* addField
71			*
72			* Declare a new field with no validators nor cleaner. It can be declared
73			* if the field is optional or mandatory.
74			* If the field already exists, it is overriden.
75			*/
76			public function addField(string $name, bool $is_mandatory = true): self
77			{
78			$this->fields[$name] = $is_mandatory;
79
80			return $this;
81			}
82
83			/**
84			* addFields
85			*
86			* Declare several fields at once.Existing fields are overriden.
87			*/
88			public function addFields(array $fields, $are_mandatory = true): self
89			{
90			array_merge($this->fields, array_fill_keys($fields, $are_mandatory));
91
92			return $this;
93			}
94
95			/**
96			* removeField
97			*
98			* Remove an existing field with all validators or cleaners associated to
99			* it if any. It throws an exception if the field does not exist.
100			*
101			* @throws \InvalidArgumentException
102			*/
103			public function removeField(string $name): self
104			{
105			$this->checkFieldExists($name);
106			unset($this->fields[$name]);
107
108			if (isset($this->validators[$name])) {
109			unset($this->validators[$name]);
110			}
111
112			if (isset($this->cleaners[$name])) {
113			unset($this->cleaners[$name]);
114			}
115
116			return $this;
117			}
118
119			/**
120			* addValidator
121			*
122			* Add a new validator associated to a key. If the field is not already
123			* declared, it is created.
124			*
125			* @throws \InvalidArgumentException
126			*/
127			public function addValidator(string $name, callable $validator): self
128			{
129			$this
130			->checkFieldExists($name)
131			->validators[$name][] = $validator
132			;
133
134			return $this;
135			}
136
137			/**
138			* addCleaner
139			*
140			* Add a new cleaner associated to a key.
141			*
142			* @throws \InvalidArgumentException
143			*/
144			public function addCleaner(string $name, callable $cleaner): self
145			{
146			$this
147			->checkFieldExists($name)
148			->cleaners[$name][] = $cleaner
149			;
150
151			return $this;
152			}
153
154			/**
155			* setDefaultValue
156			*
157			* Set a default value for a field. If the field is not set or its value is
158			* null, this value will be set instead. This is triggered AFTER the
159			* cleaners which is useful because some cleanders can return null and then
160			* default value is applied.
161			*
162			* @throws \InvalidArgumentException
163			*/
164			public function setDefaultValue(string $name, $value): self
165			{
166			$this
167			->checkFieldExists($name)
168			->default_values[$name] = $value
169			;
170
171			return $this;
172			}
173
174			/**
175			* addJuicer
176			*
177			* Add a juicer to clean a validate a subset of data.
178			*
179			* @throws \InvalidArgumentException
180			*/
181			public function addJuicer(string $name, ParameterJuicerInterface $juicer): self
182			{
183			return $this
184			->addCleaner($name, [$juicer, 'clean'])
185			->addValidator($name, [$juicer, 'validate'])
186			;
187			}
188
189			/**
190			* setStrategy
191			*
192			* Set the extra fields strategy for this juicer.
193			*/
194			public function setStrategy(int $strategy): self
195			{
196			$this->strategy = $strategy;
197
198			return $this;
199			}
200
201			/**
202			* squash
203			*
204			* Clean & validate the given data according to the definition.
205			*/
206			public function squash(array $values): array
207			{
208			$values = $this->clean($values);
209			$this->validate($this->getName(), $values);
210
211			return $values;
212			}
213
214			/**
215			* validate
216			*
217			* Trigger validation on values.
218			*
219			* @see ParameterJuicerInterface
220			*/
221			public function validate(string $name, array $values): ParameterJuicerInterface
222			{
223			$exception = new ValidationException;
224
225			if ($this->strategy === self::STRATEGY_REFUSE_EXTRA_VALUES) {
226			$this->refuseExtraFields($values, $exception);
227			}
228			$this->validateFields($values, $exception);
229
230			if ($exception->hasExceptions()) {
231			throw $exception;
232			}
233
234			return $this;
235			}
236
237			/**
238			* refuseExtraFields
239			*
240			* Fill the exception with refused extra fields if any.
241			*/
242			private function refuseExtraFields(array $values, ValidationException $exception): self
243			{
244			$diff = array_keys(array_diff_key($values, $this->fields));
245
246			foreach ($diff as $fied_name) {
247			$exception->addException(new ValidationException(
248			sprintf("Extra field '%s' is refused by validation strategy.", $fied_name)
249			));
250			}
251
252			return $this;
253			}
254
255			/**
256			* validateFields
257			*
258			* Check mandatory fields and launch validators.
259			*/
260			private function validateFields(array $values, ValidationException $exception): self
261			{
262			foreach ($this->fields as $field => $is_mandatory) {
263			$is_set = isset($values[$field]) \|\| array_key_exists($field, $values);
264
265			if ($is_mandatory && !$is_set) {
266			$exception->addException(
267			new ValidationException(
268			sprintf(
269			"Missing field '%s' is mandatory.",
270			$field
271			)
272			)
273			);
274
275			} elseif ($is_set && isset($this->validators[$field])) {
276			$this->launchValidatorsFor(
277			$field,
278			$values[$field],
279			$exception
280			);
281			}
282			}
283
284			return $this;
285			}
286
287			/**
288			* setDefaultValues
289			*
290			* Apply default values. When a field is not present in the values, the
291			* default value is set.
292			*/
293			private function setDefaultValues(array $values): array
294			{
295			foreach ($this->default_values as $field => $default_value) {
296			if (!isset($values[$field]) && !array_key_exists($field, $values)) {
297			$values[$field] = $default_value;
298			}
299			}
300
301			return $values;
302			}
303
304			/**
305			* clean
306			*
307			* Clean and return values.
308			*
309			* @see ParameterJuicerInterface
310			*/
311			public function clean(array $values): array
312			{
313			if ($this->strategy === self::STRATEGY_IGNORE_EXTRA_VALUES) {
314			$values = array_intersect_key($values, $this->fields);
315			}
316
317			return $this->setDefaultValues($this->triggerCleaning($values));
318			}
319
320			/**
321			* triggerCleaning
322			*
323			* Launch cleaners on the values.
324			*/
325			private function triggerCleaning(array $values): array
326			{
327			foreach ($this->cleaners as $field_name => $cleaners) {
328			if (isset($values[$field_name]) \|\| array_key_exists($field_name, $values)) {
329			foreach ($cleaners as $cleaner) {
330			try {
331			$values[$field_name] =
332			call_user_func($cleaner, $values[$field_name])
333			;
334			} catch (CleanerRemoveFieldException $e) {
335			unset($values[$field_name]);
336			}
337			}
338			}
339			}
340
341			return $values;
342			}
343
344			/**
345			* checkFieldExists
346			*
347			* Throw an exception if the field does not exist.
348			*
349			* @throws \InvalidArgumentException
350			*/
351			private function checkFieldExists(string $name): self
352			{
353			if (!isset($this->fields[$name])) {
354			throw new \InvalidArgumentException(
355			sprintf(
356			"Field '%s' is not declared, fields are {%s}.",
357			$name,
358			join(', ', array_keys($this->fields))
359			)
360			);
361			}
362
363			return $this;
364			}
365
366			/**
367			* launchValidatorsFor
368			*
369			* Triger validators for the given field if any.
370			*
371			* @throws \RuntimeException if the callable fails.
372			*/
373			private function launchValidatorsFor(string $field, $value, ValidationException $exception): self
374			{
375			foreach ($this->validators[$field] as $validator) {
376			try {
377			if (call_user_func($validator, $field, $value) === false) {
378			throw new \RuntimeException(
379			sprintf("One of the validators for the field '%s' has a PHP error.", $field)
380			);
381			}
382			} catch (ValidationException $e) {
383			$exception->addException($e);
384			}
385			}
386
387			return $this;
388			}
389			}
390
391

chanmix51 / ParameterJuicer

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ParameterJuicer::launchValidatorsFor() A

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