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<?php |
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/****************************************************************************** |
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* An implementation of dicto (scg.unibe.ch/dicto) in and for PHP. |
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* |
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* Copyright (c) 2016 Richard Klees <[email protected]> |
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* |
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* This software is licensed under The MIT License. You should have received |
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* a copy of the licence along with the code. |
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*/ |
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namespace Lechimp\Dicto\Definition; |
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use Lechimp\Dicto\Rules\Schema; |
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use Lechimp\Dicto\Rules\Invoke; |
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use Lechimp\Dicto\Rules\DependOn; |
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use Lechimp\Dicto\Rules\ContainText; |
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use Lechimp\Dicto\Rules\Rule; |
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use Lechimp\Dicto\Rules\Ruleset; |
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use Lechimp\Dicto\Variables\Variable; |
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/** |
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* Runtime for one rule definition. A rule definition starts with |
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* Dicto::startDefinition() and ends with Dicto::endDefinition(). |
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* This class provides the functionality that is accessed via the |
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* Dicto class during the definition. |
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*/ |
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class RT { |
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/** |
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* @var array $name => $definition |
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*/ |
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private $vars; |
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/** |
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* ToDo: I think, this is not necessary and current_var is sufficient. |
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* |
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* @var string|null |
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*/ |
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private $current_var_name; |
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/** |
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* @var Variable|null |
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*/ |
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private $current_var; |
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/** |
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* @var Rule[] |
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*/ |
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private $rules; |
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/** |
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* @var array|null |
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*/ |
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private $config; |
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/** |
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* @var array<string,Schema> |
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*/ |
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private $known_schemas; |
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283 |
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public function __construct() { |
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283 |
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$this->vars = array(); |
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$this->current_var_name = null; |
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$this->current_var = null; |
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$this->rules = array(); |
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$this->config = null; |
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// TODO: This needs to go somewhere else and must be more dynamic. |
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283 |
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$d = new DependOn(); |
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283 |
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$i = new Invoke(); |
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283 |
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$c = new ContainText(); |
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// TODO: There need to be checks on the name then as well. |
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$this->known_schemas = array |
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( $d->name() => $d |
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, $i->name() => $i |
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, $c->name() => $c |
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); |
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} |
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/** |
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* Set a configuration to be used with the rules. |
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* |
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* @param array|null $config |
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* @return null|array |
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*/ |
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public function configuration(array $config = null) { |
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if ($config === null) { |
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return $this->config; |
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} |
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if ($this->config !== null) { |
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throw new \RuntimeException("Already set configuration."); |
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} |
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$this->config = $config; |
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} |
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/** |
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* Get the rule set that was currently created. |
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* |
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* @return Ruleset |
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*/ |
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public function ruleset() { |
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$this->maybe_save_current_var(); |
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return new Ruleset($this->vars, $this->rules); |
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} |
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/** |
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* Define a new variable or reference an already defined variable to define |
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* a rule. |
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* |
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* @throws \RuntimeException if previous variable declaration was not finished |
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* @return NewVar|RuleVar |
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*/ |
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public function variable($name) { |
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$this->maybe_save_current_var(); |
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if (!array_key_exists($name, $this->vars)) { |
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$this->current_var_name = $name; |
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return new Fluid\NewVar($this); |
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} |
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else { |
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$this->throw_on_missing_var($name); |
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return new Fluid\RuleVar($this, $name); |
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} |
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} |
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/** |
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* Define a only-rule. |
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* |
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* @return Fluid\Only |
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*/ |
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public function only() { |
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$this->maybe_save_current_var(); |
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return new Fluid\Only($this); |
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} |
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/** |
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* Save the currently defined variable, if there is any. |
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* |
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* @throws \RuntimeException if previous variable declaration was not finished |
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*/ |
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protected function maybe_save_current_var() { |
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if ($this->current_var_name !== null) { |
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if ($this->current_var === null) { |
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throw new \RuntimeException( |
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"The declaration of ".$this->current_var_name. |
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" was not finished."); |
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} |
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$this->vars[$this->current_var_name] = $this->current_var; |
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$this->current_var_name = null; |
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$this->current_var = null; |
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} |
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} |
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/** |
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* Get the name of the current var. |
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* |
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* @return string |
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*/ |
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public function get_current_var_name() { |
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assert('is_string($this->current_var_name)'); |
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return $this->current_var_name; |
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} |
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/** |
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* Get the name of the current var. |
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* |
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* @return Variables\Variable |
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*/ |
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public function get_current_var() { |
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assert('$this->current_var !== null'); |
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return $this->current_var; |
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} |
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/** |
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* Get an already defined variable. |
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* |
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* @param string $name |
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* @return Variables\Variable |
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*/ |
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public function get_var($name) { |
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assert('array_key_exists($name, $this->vars)'); |
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return $this->vars[$name]; |
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} |
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/** |
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* Announce what the current variable is atm. |
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* |
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* @param Variable $var |
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*/ |
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public function current_var_is(Variable $var) { |
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assert('$this->current_var_name !== null'); |
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$this->current_var = $var; |
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} |
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/** |
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* Throws a RuntimeException on missing variable $var. |
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*/ |
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public function throw_on_missing_var($var) { |
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if (!array_key_exists($var, $this->vars)) { |
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throw new \RuntimeException("Missing variable $var"); |
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} |
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} |
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/** |
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* Add a rule to the set. |
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*/ |
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public function add_rule(Rule $rule) { |
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$this->rules[] = $rule; |
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} |
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/** |
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* Try to get a rule schema by name. |
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* |
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* @param string $name |
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* @return Schema|null |
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*/ |
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public function get_schema($name) { |
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assert('is_string($name)'); |
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if (array_key_exists($name, $this->known_schemas)) { |
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return $this->known_schemas[$name]; |
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} |
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return null; |
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} |
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} |
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