UriTemplate::getVariableNames() - Code Metrics - Inspection of "Adding the UriTemplate class to implement RFC6570" - thephpleague/uri - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#153)

by ignace nyamagana

created 2020-01-26 09:03 UTC

UriTemplate::getVariableNames() A

↳ Parent: UriTemplate

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Importance

Changes

Metric	Value
cc	1
eloc	1
nc	1
nop	0
dl	0
loc	3
ccs	2
cts	2
cp	1
crap	1
rs	10
c	0
b	0
f	0

<?php

/**
 * League.Uri (https://uri.thephpleague.com)
 *
 * (c) Ignace Nyamagana Butera <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

declare(strict_types=1);

namespace League\Uri;

use League\Uri\Contracts\UriException;
use League\Uri\Contracts\UriInterface;
use League\Uri\Contracts\UriTemplateInterface;
use League\Uri\Exceptions\TemplateCanNotBeExpanded;
use function array_filter;
use function array_keys;
use function explode;
use function gettype;
use function implode;
use function is_array;
use function is_bool;
use function is_scalar;
use function is_string;
use function method_exists;
use function preg_match;
use function preg_match_all;
use function preg_replace;
use function preg_replace_callback;
use function rawurlencode;
use function sprintf;
use function strpos;
use function substr;
use const PREG_SET_ORDER;

/**
 * Expands URI templates.
 *
 * @link http://tools.ietf.org/html/rfc6570
 *
 * Based on GuzzleHttp\UriTemplate class which is removed from Guzzle7.
 * @see https://github.com/guzzle/guzzle/blob/6.5/src/UriTemplate.php
 */
final class UriTemplate implements UriTemplateInterface
{
    private const REGEXP_EXPRESSION = '/\{
        (?<expression>
            (?<operator>[\.\/;\?&\=,\!@\|\+#])?
            (?<variables>[^\}]*)
        )
    \}/x';

    private const REGEXP_VARSPEC = '/^
        (?<name>(?:[A-z0-9_\.]|%[0-9a-fA-F]{2})+)
        (?<modifier>\:(?<position>\d+)|\*)?
    $/x';

    private const RESERVED_OPERATOR = '=,!@|';

    private const OPERATOR_HASH_LOOKUP = [
        ''  => ['prefix' => '',  'joiner' => ',', 'query' => false],
        '+' => ['prefix' => '',  'joiner' => ',', 'query' => false],
        '#' => ['prefix' => '#', 'joiner' => ',', 'query' => false],
        '.' => ['prefix' => '.', 'joiner' => '.', 'query' => false],
        '/' => ['prefix' => '/', 'joiner' => '/', 'query' => false],
        ';' => ['prefix' => ';', 'joiner' => ';', 'query' => true],
        '?' => ['prefix' => '?', 'joiner' => '&', 'query' => true],
        '&' => ['prefix' => '&', 'joiner' => '&', 'query' => true],
    ];

    /**
     * @var string
     */
    private $template;

    /**
     * @var array
     */
    private $defaultVariables;

    /**
     * @var array
     */
    private $variableNames;

    /**
     * @var array
     */
    private $expressions;

    /**
     * @var UriInterface|null
     */
    private $uri;

    /**
     * @var array
     */
    private $variables;

    /**
     * @param object|string $template a string or an object with the __toString method
     *
     * @throws \TypeError               if the template is not a string or an object with the __toString method
     * @throws TemplateCanNotBeExpanded if the template syntax is invalid
     */
    public function __construct($template, array $defaultVariables = [])
    {
        $this->template = $this->filterTemplate($template);
        $this->defaultVariables = $defaultVariables;

        $this->parseExpressions();
    }

    /**
     * @param object|string $template a string or an object with the __toString method
     *
     * @throws \TypeError if the template is not a string or an object with the __toString method
     */
    private function filterTemplate($template): string
    {
        if (!is_string($template) && !method_exists($template, '__toString')) {
            throw new \TypeError(sprintf('The template must be a string or a stringable object %s given.', gettype($template)));
        }

        return (string) $template;
    }

    /**
     * Parse the template expressions.
     *
     * @throws TemplateCanNotBeExpanded if the template syntax is invalid
     */
    private function parseExpressions(): void
    {
        /** @var string $remainder */
        $remainder = preg_replace(self::REGEXP_EXPRESSION, '', $this->template);
        if (false !== strpos($remainder, '{') || false !== strpos($remainder, '}')) {
            throw TemplateCanNotBeExpanded::dueToMalformedExpression($this->template);
        }

        $this->uri = null;
        $this->expressions = [];
        preg_match_all(self::REGEXP_EXPRESSION, $this->template, $expressions, PREG_SET_ORDER);
        $foundVariables = [];
        foreach ($expressions as $expression) {
            $expression = $expression + ['operator' => ''];
            [$parsedVariables, $foundVariables] = $this->parseVariableSpecification($expression, $foundVariables);
            $hashLookUp = self::OPERATOR_HASH_LOOKUP[$expression['operator']];
            $this->expressions[$expression['expression']] = [
                'operator' => $expression['operator'],
                'variables' => $parsedVariables,
                'joiner' => $hashLookUp['joiner'],
                'prefix' => $hashLookUp['prefix'],
                'query' => $hashLookUp['query'],
            ];
        }

        $this->variableNames = array_keys($foundVariables);
    }

    /**
     * Parses a variable specification in conformance to RFC6570.
     *
     * @throws TemplateCanNotBeExpanded if the expression does not conform to RFC6570
     */
    private function parseVariableSpecification(array $expression, array $foundVariables): array
    {
        $parsedVariableSpecification = [];
        if ('' !== $expression['operator'] && false !== strpos(self::RESERVED_OPERATOR, $expression['operator'])) {
            throw TemplateCanNotBeExpanded::dueToUsingReservedOperator($expression['expression']);
        }

        foreach (explode(',', $expression['variables']) as $varSpec) {
            if (1 !== preg_match(self::REGEXP_VARSPEC, $varSpec, $parsed)) {
                throw TemplateCanNotBeExpanded::dueToMalformedVariableSpecification($varSpec, $expression['expression']);
            }

            $parsed += ['modifier' => '', 'position' => ''];
            if ('' !== $parsed['position']) {
                $parsed['position'] = (int) $parsed['position'];
                $parsed['modifier'] = ':';
            }

            $foundVariables[$parsed['name']] = 1;
            $parsedVariableSpecification[] = $parsed;
        }

        return [$parsedVariableSpecification, $foundVariables];
    }

    /**
     * {@inheritDoc}
     */
    public function getTemplate(): string
    {
        return $this->template;
    }

    /**
     * {@inheritDoc}
     */
    public function getVariableNames(): array
    {
        return $this->variableNames;
    }

    /**
     * {@inheritDoc}
     */
    public function withTemplate($template): UriTemplateInterface
    {
        $template = $this->filterTemplate($template);
        if ($template === $this->template) {
            return $this;
        }

        $clone = clone $this;
        $clone->template = $template;
        $clone->parseExpressions();

        return $clone;
    }

    /**
     * {@inheritDoc}
     */
    public function getDefaultVariables(): array
    {
        return $this->defaultVariables;
    }

    /**
     * {@inheritDoc}
     */
    public function withDefaultVariables(array $defaultDefaultVariables): UriTemplateInterface
    {
        if ($defaultDefaultVariables === $this->defaultVariables) {
            return $this;
        }

        $clone = clone $this;
        $clone->defaultVariables = $defaultDefaultVariables;

        return $clone;
    }

    /**
     * @throws TemplateCanNotBeExpanded if the variable contains nested array values
     * @throws UriException             if the resulting expansion can not be converted to a UriInterface instance
     */
    public function expand(array $variables = []): UriInterface
    {
        if ([] === $this->expressions) {
            $this->uri = $this->uri ?? Uri::createFromString($this->template);

            return $this->uri;
        }

        $this->variables = $variables + $this->defaultVariables;

        /** @var string $uri */
        $uri = preg_replace_callback(self::REGEXP_EXPRESSION, [$this, 'expandExpression'], $this->template);

        return Uri::createFromString($uri);
    }

    /**
     * Expands the found expressions.
     *
     * @throws TemplateCanNotBeExpanded if the variables is an array and a ":" modifier needs to be applied
     * @throws TemplateCanNotBeExpanded if the variables contains nested array values
     */
    private function expandExpression(array $matches): string
    {
        $expression = $this->expressions[$matches['expression']];

        $joiner = $expression['joiner'];
        $useQuery = $expression['query'];

        $parts = [];
        foreach ($expression['variables'] as $variable) {
            $parts[] = $this->expandVariable($variable, $expression['operator'], $joiner, $useQuery);
        }

        $expanded = implode($joiner, array_filter($parts));
        $prefix = $expression['prefix'];
        if ('' !== $expanded && '' !== $prefix) {
            return $prefix.$expanded;
        }

        return $expanded;
    }

    /**
     * Expands an expression.
     *
     * @throws TemplateCanNotBeExpanded if the variables is an array and a ":" modifier needs to be applied
     * @throws TemplateCanNotBeExpanded if the variables contains nested array values
     */
    private function expandVariable(array $value, string $operator, string $joiner, bool $useQuery): string
    {
        $expanded = '';
        if (!isset($this->variables[$value['name']])) {
            return $expanded;
        }

        $variable = $this->normalizeVariable($this->variables[$value['name']]);
        $arguments = [$variable, $value, $operator];
        $method = 'expandString';
        $actualQuery = $useQuery;
        if (is_array($variable)) {
            $arguments[] = $joiner;
            $arguments[] = $useQuery;
            $method = 'expandList';
        }

        $expanded = $this->$method(...$arguments);
        if (is_array($expanded)) {
            [$expanded, $actualQuery] = $expanded;
        }

        if (!$actualQuery) {
            return $expanded;
        }

        if ('&' !== $joiner && '' === $expanded) {
            return $value['name'];
        }

        return $value['name'].'='.$expanded;
    }

    /**
     * @param mixed $var the value to be expanded
     *
     * @throws \TypeError if the type is not supported
     */
    private function normalizeVariable($var)
    {
        if (is_array($var)) {
            return $var;
        }

        if (is_bool($var)) {
            return true === $var ? '1' : '0';
        }

        if (is_scalar($var) || method_exists($var, '__toString')) {
            return (string) $var;
        }

        throw new \TypeError(sprintf('The variables must be a scalar or a stringable object `%s` given', gettype($var)));
    }

    /**
     * Expands an expression using a string value.
     */
    private function expandString(string $variable, array $value, string $operator): string
    {
        if (':' === $value['modifier']) {
            $variable = substr($variable, 0, $value['position']);
        }

        $expanded = rawurlencode($variable);
        if ('+' === $operator || '#' === $operator) {
            return $this->decodeReserved($expanded);
        }

        return $expanded;
    }

    /**
     * Expands an expression using a list of values.
     *
     * @throws TemplateCanNotBeExpanded if the variables is an array and a ":" modifier needs to be applied
     * @throws TemplateCanNotBeExpanded if the variables contains nested array values
     *
     * @return array{0:string, 1:bool}
     */
    private function expandList(array $variable, array $value, string $operator, string $joiner, bool $useQuery): array
    {
        if ([] === $variable) {
            return ['', false];
        }

        $isAssoc = $this->isAssoc($variable);
        $pairs = [];
        if (':' === $value['modifier']) {
            throw TemplateCanNotBeExpanded::dueToUnableToProcessValueListWithPrefix($value['name']);
        }

        /** @var string $key */
        foreach ($variable as $key => $var) {
            if ($isAssoc) {
                if (is_array($var)) {
                    throw TemplateCanNotBeExpanded::dueToNestedListOfValue($key);
                }

                $key = rawurlencode((string) $key);
            }

            $var = rawurlencode((string) $var);
            if ('+' === $operator || '#' === $operator) {
                $var = $this->decodeReserved($var);
            }

            if ('*' === $value['modifier']) {
                if ($isAssoc) {
                    $var = $key.'='.$var;
                } elseif ($key > 0 && $useQuery) {
                    $var = $value['name'].'='.$var;
                }
            }

            $pairs[$key] = $var;
        }

        if ('*' === $value['modifier']) {
            if ($isAssoc) {
                // Don't prepend the value name when using the explode
                // modifier with an associative array.
                $useQuery = false;
            }

            return [implode($joiner, $pairs), $useQuery];
        }

        if ($isAssoc) {
            // When an associative array is encountered and the
            // explode modifier is not set, then the result must be
            // a comma separated list of keys followed by their
            // respective values.
            foreach ($pairs as $offset => &$data) {
                $data = $offset.','.$data;
            }

            unset($data);
        }

        return [implode(',', $pairs), $useQuery];
    }

    /**
     * Determines if an array is associative.
     *
     * This makes the assumption that input arrays are sequences or hashes.
     * This assumption is a tradeoff for accuracy in favor of speed, but it
     * should work in almost every case where input is supplied for a URI
     * template.
     */
    private function isAssoc(array $array): bool
    {
        return [] !== $array && 0 !== array_keys($array)[0];
    }

    /**
     * Removes percent encoding on reserved characters (used with + and # modifiers).
     */
    private function decodeReserved(string $str): string
    {
        static $delimiters = [
            ':', '/', '?', '#', '[', ']', '@', '!', '$',
            '&', '\'', '(', ')', '*', '+', ',', ';', '=',
        ];

        static $delimiters_encoded = [
            '%3A', '%2F', '%3F', '%23', '%5B', '%5D', '%40', '%21', '%24',
            '%26', '%27', '%28', '%29', '%2A', '%2B', '%2C', '%3B', '%3D',
        ];

        return str_replace($delimiters_encoded, $delimiters, $str);
    }
}


1		<?php
2
3		/**
4		* League.Uri (https://uri.thephpleague.com)
5		*
6		* (c) Ignace Nyamagana Butera <[email protected]>
7		*
8		* For the full copyright and license information, please view the LICENSE
9		* file that was distributed with this source code.
10		*/
11
12		declare(strict_types=1);
13
14		namespace League\Uri;
15
16		use League\Uri\Contracts\UriException;
17		use League\Uri\Contracts\UriInterface;
18		use League\Uri\Contracts\UriTemplateInterface;
19		use League\Uri\Exceptions\TemplateCanNotBeExpanded;
20		use function array_filter;
21		use function array_keys;
22		use function explode;
23		use function gettype;
24		use function implode;
25		use function is_array;
26		use function is_bool;
27		use function is_scalar;
28		use function is_string;
29		use function method_exists;
30		use function preg_match;
31		use function preg_match_all;
32		use function preg_replace;
33		use function preg_replace_callback;
34		use function rawurlencode;
35		use function sprintf;
36		use function strpos;
37		use function substr;
38		use const PREG_SET_ORDER;
39
40		/**
41		* Expands URI templates.
42		*
43		* @link http://tools.ietf.org/html/rfc6570
44		*
45		* Based on GuzzleHttp\UriTemplate class which is removed from Guzzle7.
46		* @see https://github.com/guzzle/guzzle/blob/6.5/src/UriTemplate.php
47		*/
48		final class UriTemplate implements UriTemplateInterface
49		{
50		private const REGEXP_EXPRESSION = '/\{
51		(?<expression>
52		(?<operator>[\.\/;\?&\=,\!@\\|\+#])?
53		(?<variables>[^\}]*)
54		)
55		\}/x';
56
57		private const REGEXP_VARSPEC = '/^
58		(?<name>(?:[A-z0-9_\.]\|%[0-9a-fA-F]{2})+)
59		(?<modifier>\:(?<position>\d+)\|\*)?
60		$/x';
61
62		private const RESERVED_OPERATOR = '=,!@\|';
63
64		private const OPERATOR_HASH_LOOKUP = [
65		'' => ['prefix' => '', 'joiner' => ',', 'query' => false],
66		'+' => ['prefix' => '', 'joiner' => ',', 'query' => false],
67		'#' => ['prefix' => '#', 'joiner' => ',', 'query' => false],
68		'.' => ['prefix' => '.', 'joiner' => '.', 'query' => false],
69		'/' => ['prefix' => '/', 'joiner' => '/', 'query' => false],
70		';' => ['prefix' => ';', 'joiner' => ';', 'query' => true],
71		'?' => ['prefix' => '?', 'joiner' => '&', 'query' => true],
72		'&' => ['prefix' => '&', 'joiner' => '&', 'query' => true],
73		];
74
75		/**
76		* @var string
77		*/
78		private $template;
79
80		/**
81		* @var array
82		*/
83		private $defaultVariables;
84
85		/**
86		* @var array
87		*/
88		private $variableNames;
89
90		/**
91		* @var array
92		*/
93		private $expressions;
94
95		/**
96		* @var UriInterface\|null
97		*/
98		private $uri;
99
100		/**
101		* @var array
102		*/
103		private $variables;
104
105		/**
106		* @param object\|string $template a string or an object with the __toString method
107		*
108		* @throws \TypeError if the template is not a string or an object with the __toString method
109		* @throws TemplateCanNotBeExpanded if the template syntax is invalid
110		*/
111	242	public function __construct($template, array $defaultVariables = [])
112		{
113	242	$this->template = $this->filterTemplate($template);
114	240	$this->defaultVariables = $defaultVariables;
115
116	240	$this->parseExpressions();
117	180	}
118
119		/**
120		* @param object\|string $template a string or an object with the __toString method
121		*
122		* @throws \TypeError if the template is not a string or an object with the __toString method
123		*/
124	242	private function filterTemplate($template): string
125		{
126	242	if (!is_string($template) && !method_exists($template, '__toString')) {
127	2	throw new \TypeError(sprintf('The template must be a string or a stringable object %s given.', gettype($template)));
128		}
129
130	240	return (string) $template;
131		}
132
133		/**
134		* Parse the template expressions.
135		*
136		* @throws TemplateCanNotBeExpanded if the template syntax is invalid
137		*/
138	240	private function parseExpressions(): void
139		{
140		/** @var string $remainder */
141	240	$remainder = preg_replace(self::REGEXP_EXPRESSION, '', $this->template);
142	240	if (false !== strpos($remainder, '{') \|\| false !== strpos($remainder, '}')) {
143	6	throw TemplateCanNotBeExpanded::dueToMalformedExpression($this->template);
144		}
145
146	234	$this->uri = null;
147	234	$this->expressions = [];
148	234	preg_match_all(self::REGEXP_EXPRESSION, $this->template, $expressions, PREG_SET_ORDER);
149	234	$foundVariables = [];
150	234	foreach ($expressions as $expression) {
151	230	$expression = $expression + ['operator' => ''];
152	230	[$parsedVariables, $foundVariables] = $this->parseVariableSpecification($expression, $foundVariables);
153	180	$hashLookUp = self::OPERATOR_HASH_LOOKUP[$expression['operator']];
154	180	$this->expressions[$expression['expression']] = [
155	180	'operator' => $expression['operator'],
156	180	'variables' => $parsedVariables,
157	180	'joiner' => $hashLookUp['joiner'],
158	180	'prefix' => $hashLookUp['prefix'],
159	180	'query' => $hashLookUp['query'],
160		];
161		}
162
163	180	$this->variableNames = array_keys($foundVariables);
164	180	}
165
166		/**
167		* Parses a variable specification in conformance to RFC6570.
168		*
169		* @throws TemplateCanNotBeExpanded if the expression does not conform to RFC6570
170		*/
171	230	private function parseVariableSpecification(array $expression, array $foundVariables): array
172		{
173	230	$parsedVariableSpecification = [];
174	230	if ('' !== $expression['operator'] && false !== strpos(self::RESERVED_OPERATOR, $expression['operator'])) {
175	6	throw TemplateCanNotBeExpanded::dueToUsingReservedOperator($expression['expression']);
176		}
177
178	224	foreach (explode(',', $expression['variables']) as $varSpec) {
179	224	if (1 !== preg_match(self::REGEXP_VARSPEC, $varSpec, $parsed)) {
180	48	throw TemplateCanNotBeExpanded::dueToMalformedVariableSpecification($varSpec, $expression['expression']);
181		}
182
183	184	$parsed += ['modifier' => '', 'position' => ''];
184	184	if ('' !== $parsed['position']) {
185	28	$parsed['position'] = (int) $parsed['position'];
186	28	$parsed['modifier'] = ':';
187		}
188
189	184	$foundVariables[$parsed['name']] = 1;
190	184	$parsedVariableSpecification[] = $parsed;
191		}
192
193	180	return [$parsedVariableSpecification, $foundVariables];
194		}
195
196		/**
197		* {@inheritDoc}
198		*/
199	4	public function getTemplate(): string
200		{
201	4	return $this->template;
202		}
203
204		/**
205		* {@inheritDoc}
206		*/
207	8	public function getVariableNames(): array
208		{
209	8	return $this->variableNames;
210		}
211
212		/**
213		* {@inheritDoc}
214		*/
215	2	public function withTemplate($template): UriTemplateInterface
216		{
217	2	$template = $this->filterTemplate($template);
218	2	if ($template === $this->template) {
219	2	return $this;
220		}
221
222	2	$clone = clone $this;
223	2	$clone->template = $template;
224	2	$clone->parseExpressions();
225
226	2	return $clone;
227		}
228
229		/**
230		* {@inheritDoc}
231		*/
232	6	public function getDefaultVariables(): array
233		{
234	6	return $this->defaultVariables;
235		}
236
237		/**
238		* {@inheritDoc}
239		*/
240	2	public function withDefaultVariables(array $defaultDefaultVariables): UriTemplateInterface
241		{
242	2	if ($defaultDefaultVariables === $this->defaultVariables) {
243	2	return $this;
244		}
245
246	2	$clone = clone $this;
247	2	$clone->defaultVariables = $defaultDefaultVariables;
248
249	2	return $clone;
250		}
251
252		/**
253		* @throws TemplateCanNotBeExpanded if the variable contains nested array values
254		* @throws UriException if the resulting expansion can not be converted to a UriInterface instance
255		*/
256	164	public function expand(array $variables = []): UriInterface
257		{
258	164	if ([] === $this->expressions) {
259	2	$this->uri = $this->uri ?? Uri::createFromString($this->template);
260
261	2	return $this->uri;
262		}
263
264	162	$this->variables = $variables + $this->defaultVariables;
265
266		/** @var string $uri */
267	162	$uri = preg_replace_callback(self::REGEXP_EXPRESSION, [$this, 'expandExpression'], $this->template);
268
269	154	return Uri::createFromString($uri);
270		}
271
272		/**
273		* Expands the found expressions.
274		*
275		* @throws TemplateCanNotBeExpanded if the variables is an array and a ":" modifier needs to be applied
276		* @throws TemplateCanNotBeExpanded if the variables contains nested array values
277		*/
278	162	private function expandExpression(array $matches): string
279		{
280	162	$expression = $this->expressions[$matches['expression']];
281
282	162	$joiner = $expression['joiner'];
283	162	$useQuery = $expression['query'];
284
285	162	$parts = [];
286	162	foreach ($expression['variables'] as $variable) {
287	162	$parts[] = $this->expandVariable($variable, $expression['operator'], $joiner, $useQuery);
288		}
289
290	154	$expanded = implode($joiner, array_filter($parts));
291	154	$prefix = $expression['prefix'];
292	154	if ('' !== $expanded && '' !== $prefix) {
293	102	return $prefix.$expanded;
294		}
295
296	62	return $expanded;
297		}
298
299		/**
300		* Expands an expression.
301		*
302		* @throws TemplateCanNotBeExpanded if the variables is an array and a ":" modifier needs to be applied
303		* @throws TemplateCanNotBeExpanded if the variables contains nested array values
304		*/
305	162	private function expandVariable(array $value, string $operator, string $joiner, bool $useQuery): string
306		{
307	162	$expanded = '';
308	162	if (!isset($this->variables[$value['name']])) {
309	6	return $expanded;
310		}
311
312	158	$variable = $this->normalizeVariable($this->variables[$value['name']]);
313	156	$arguments = [$variable, $value, $operator];
314	156	$method = 'expandString';
315	156	$actualQuery = $useQuery;
316	156	if (is_array($variable)) {
317	86	$arguments[] = $joiner;
318	86	$arguments[] = $useQuery;
319	86	$method = 'expandList';
320		}
321
322	156	$expanded = $this->$method(...$arguments);
323	152	if (is_array($expanded)) {
324	80	[$expanded, $actualQuery] = $expanded;
325		}
326
327	152	if (!$actualQuery) {
328	114	return $expanded;
329		}
330
331	46	if ('&' !== $joiner && '' === $expanded) {
332	2	return $value['name'];
333		}
334
335	46	return $value['name'].'='.$expanded;
336		}
337
338		/**
339		* @param mixed $var the value to be expanded
340		*
341		* @throws \TypeError if the type is not supported
342		*/
343	158	private function normalizeVariable($var)
344		{
345	158	if (is_array($var)) {
346	86	return $var;
347		}
348
349	86	if (is_bool($var)) {
350	2	return true === $var ? '1' : '0';
351		}
352
353	84	if (is_scalar($var) \|\| method_exists($var, '__toString')) {
354	82	return (string) $var;
355		}
356
357	2	throw new \TypeError(sprintf('The variables must be a scalar or a stringable object `%s` given', gettype($var)));
358		}
359
360		/**
361		* Expands an expression using a string value.
362		*/
363	84	private function expandString(string $variable, array $value, string $operator): string
364		{
365	84	if (':' === $value['modifier']) {
366	22	$variable = substr($variable, 0, $value['position']);
367		}
368
369	84	$expanded = rawurlencode($variable);
370	84	if ('+' === $operator \|\| '#' === $operator) {
371	32	return $this->decodeReserved($expanded);
372		}
373
374	60	return $expanded;
375		}
376
377		/**
378		* Expands an expression using a list of values.
379		*
380		* @throws TemplateCanNotBeExpanded if the variables is an array and a ":" modifier needs to be applied
381		* @throws TemplateCanNotBeExpanded if the variables contains nested array values
382		*
383		* @return array{0:string, 1:bool}
384		*/
385	86	private function expandList(array $variable, array $value, string $operator, string $joiner, bool $useQuery): array
386		{
387	86	if ([] === $variable) {
388	4	return ['', false];
389		}
390
391	82	$isAssoc = $this->isAssoc($variable);
392	82	$pairs = [];
393	82	if (':' === $value['modifier']) {
394	4	throw TemplateCanNotBeExpanded::dueToUnableToProcessValueListWithPrefix($value['name']);
395		}
396
397		/** @var string $key */
398	78	foreach ($variable as $key => $var) {
399	78	if ($isAssoc) {
400	38	if (is_array($var)) {
401	2	throw TemplateCanNotBeExpanded::dueToNestedListOfValue($key);
402		}
403
404	36	$key = rawurlencode((string) $key);
405		}
406
407	76	$var = rawurlencode((string) $var);
408	76	if ('+' === $operator \|\| '#' === $operator) {
409	16	$var = $this->decodeReserved($var);
410		}
411
412	76	if ('*' === $value['modifier']) {
413	44	if ($isAssoc) {
414	20	$var = $key.'='.$var;
415	24	} elseif ($key > 0 && $useQuery) {
416	12	$var = $value['name'].'='.$var;
417		}
418		}
419
420	76	$pairs[$key] = $var;
421		}
422
423	76	if ('*' === $value['modifier']) {
424	44	if ($isAssoc) {
425		// Don't prepend the value name when using the explode
426		// modifier with an associative array.
427	20	$useQuery = false;
428		}
429
430	44	return [implode($joiner, $pairs), $useQuery];
431		}
432
433	38	if ($isAssoc) {
434		// When an associative array is encountered and the
435		// explode modifier is not set, then the result must be
436		// a comma separated list of keys followed by their
437		// respective values.
438	16	foreach ($pairs as $offset => &$data) {
439	16	$data = $offset.','.$data;
440		}
441
442	16	unset($data);
443		}
444
445	38	return [implode(',', $pairs), $useQuery];
446		}
447
448		/**
449		* Determines if an array is associative.
450		*
451		* This makes the assumption that input arrays are sequences or hashes.
452		* This assumption is a tradeoff for accuracy in favor of speed, but it
453		* should work in almost every case where input is supplied for a URI
454		* template.
455		*/
456	82	private function isAssoc(array $array): bool
457		{
458	82	return [] !== $array && 0 !== array_keys($array)[0];
459		}
460
461		/**
462		* Removes percent encoding on reserved characters (used with + and # modifiers).
463		*/
464	48	private function decodeReserved(string $str): string
465		{
466	48	static $delimiters = [
467		':', '/', '?', '#', '[', ']', '@', '!', '$',
468		'&', '\'', '(', ')', '*', '+', ',', ';', '=',
469		];
470
471	48	static $delimiters_encoded = [
472		'%3A', '%2F', '%3F', '%23', '%5B', '%5D', '%40', '%21', '%24',
473		'%26', '%27', '%28', '%29', '%2A', '%2B', '%2C', '%3B', '%3D',
474		];
475
476	48	return str_replace($delimiters_encoded, $delimiters, $str);
477		}
478		}
479

thephpleague / uri

Pull Request — master (#153)

UriTemplate::getVariableNames() A

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