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<?php |
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namespace Rexlabs\Smokescreen\Definition; |
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use Rexlabs\Smokescreen\Exception\ParseDefinitionException; |
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use Rexlabs\Smokescreen\Helpers\StrHelper; |
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class DefinitionParser |
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{ |
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/** |
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* A list of keys that are allowed to be present. |
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* |
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* @var array |
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*/ |
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protected $allowedKeys = []; |
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/** |
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* Short keys map a shortcut key to a specific directive. |
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* |
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* @var array |
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*/ |
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protected $shortKeys = []; |
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/** |
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* Parses a definition string into an array. |
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* Supports a value like integer|arg1:val|arg2:val|arg3. |
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* |
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* @param string $str |
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* |
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* @throws \Rexlabs\Smokescreen\Exception\ParseDefinitionException |
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* |
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* @return array |
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*/ |
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public function parse($str): array |
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{ |
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$definition = []; |
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if (empty($str)) { |
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// Return empty definition |
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return $definition; |
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} |
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// Directives are delimited with a pipe operator |
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foreach (preg_split('/\s*\|\s*/', $str) as $directive) { |
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// May consist of "directive:value" or it may just be "directive". |
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$parts = explode(':', $directive, 2); |
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$key = $parts[0]; |
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$value = $parts[1] ?? null; |
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if (isset($this->shortKeys[$key])) { |
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if ($value !== null) { |
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// If a value was also provided, we'll store that in a separate entry. |
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$definition[$this->normalizeKey($key)] = $value; |
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} |
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$value = $key; |
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$key = $this->shortKeys[$key]; |
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} |
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if (!$this->isAllowedKey($key)) { |
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throw new ParseDefinitionException("Unsupported key '$key'"); |
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} |
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// Normalise our directive (as snake_case) and store the value. |
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$definition[$this->normalizeKey($key)] = $value; |
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} |
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return $definition; |
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} |
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/** |
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* Normalize a directive key. |
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* |
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* @param string $key |
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* |
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* @return string |
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*/ |
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protected function normalizeKey($key): string |
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{ |
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return StrHelper::snakeCase(strtolower($key)); |
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} |
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/** |
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* Set a list of keys which are allowed. |
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* An empty array will allow any key. |
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* An exception will be thrown while parsing when the allowed keys are not empty, and the |
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* directive key is not present in this list. |
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* |
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* @param array $keys |
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* |
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* @return $this |
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*/ |
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public function setAllowedKeys(array $keys) |
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{ |
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$this->allowedKeys = $keys; |
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return $this; |
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} |
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/** |
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* Determine if a given key is permitted. |
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* |
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* @param $key |
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* |
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* @return bool |
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*/ |
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protected function isAllowedKey($key): bool |
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{ |
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return empty($this->allowedKeys) || \in_array($key, $this->allowedKeys, true); |
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} |
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/** |
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* Register one or more shortcut keys which map to a directive. |
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* For example a shortcut key of 'integer' can mapped to a directive of 'type'. |
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* This would allow a user to specify a directive of simply 'integer', instead |
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* of 'type:integer'. |
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* |
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* @param string $directive |
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* @param array $keys |
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* |
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* @return $this |
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*/ |
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public function addShortKeys(string $directive, array $keys) |
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{ |
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foreach ($keys as $key) { |
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$this->shortKeys[$key] = $directive; |
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} |
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return $this; |
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} |
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} |
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rexlabsio /
smokescreen-php
