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✏️ Editing: ValidationRuleParser.php

<?php

namespace Illuminate\Validation;

use Closure;
use Illuminate\Contracts\Validation\InvokableRule;
use Illuminate\Contracts\Validation\Rule as RuleContract;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Illuminate\Validation\Rules\Exists;
use Illuminate\Validation\Rules\Unique;

class ValidationRuleParser
{
    /**
     * The data being validated.
     *
     * @var array
     */
    public $data;

/**
     * The implicit attributes.
     *
     * @var array
     */
    public $implicitAttributes = [];

/**
     * Create a new validation rule parser.
     *
     * @param  array  $data
     * @return void
     */
    public function __construct(array $data)
    {
        $this->data = $data;
    }

/**
     * Parse the human-friendly rules into a full rules array for the validator.
     *
     * @param  array  $rules
     * @return \stdClass
     */
    public function explode($rules)
    {
        $this->implicitAttributes = [];

$rules = $this->explodeRules($rules);

return (object) [
            'rules' => $rules,
            'implicitAttributes' => $this->implicitAttributes,
        ];
    }

/**
     * Explode the rules into an array of explicit rules.
     *
     * @param  array  $rules
     * @return array
     */
    protected function explodeRules($rules)
    {
        foreach ($rules as $key => $rule) {
            if (str_contains($key, '*')) {
                $rules = $this->explodeWildcardRules($rules, $key, [$rule]);

unset($rules[$key]);
            } else {
                $rules[$key] = $this->explodeExplicitRule($rule, $key);
            }
        }

return $rules;
    }

/**
     * Explode the explicit rule into an array if necessary.
     *
     * @param  mixed  $rule
     * @param  string  $attribute
     * @return array
     */
    protected function explodeExplicitRule($rule, $attribute)
    {
        if (is_string($rule)) {
            return explode('|', $rule);
        }

if (is_object($rule)) {
            return Arr::wrap($this->prepareRule($rule, $attribute));
        }

return array_map(
            [$this, 'prepareRule'],
            $rule,
            array_fill((int) array_key_first($rule), count($rule), $attribute)
        );
    }

/**
     * Prepare the given rule for the Validator.
     *
     * @param  mixed  $rule
     * @param  string  $attribute
     * @return mixed
     */
    protected function prepareRule($rule, $attribute)
    {
        if ($rule instanceof Closure) {
            $rule = new ClosureValidationRule($rule);
        }

if ($rule instanceof InvokableRule) {
            $rule = InvokableValidationRule::make($rule);
        }

if (! is_object($rule) ||
            $rule instanceof RuleContract ||
            ($rule instanceof Exists && $rule->queryCallbacks()) ||
            ($rule instanceof Unique && $rule->queryCallbacks())) {
            return $rule;
        }

if ($rule instanceof NestedRules) {
            return $rule->compile(
                $attribute, $this->data[$attribute] ?? null, Arr::dot($this->data)
            )->rules[$attribute];
        }

return (string) $rule;
    }

/**
     * Define a set of rules that apply to each element in an array attribute.
     *
     * @param  array  $results
     * @param  string  $attribute
     * @param  string|array  $rules
     * @return array
     */
    protected function explodeWildcardRules($results, $attribute, $rules)
    {
        $pattern = str_replace('\*', '[^\.]*', preg_quote($attribute));

$data = ValidationData::initializeAndGatherData($attribute, $this->data);

foreach ($data as $key => $value) {
            if (Str::startsWith($key, $attribute) || (bool) preg_match('/^'.$pattern.'\z/', $key)) {
                foreach ((array) $rules as $rule) {
                    if ($rule instanceof NestedRules) {
                        $compiled = $rule->compile($key, $value, $data);

$this->implicitAttributes = array_merge_recursive(
                            $compiled->implicitAttributes,
                            $this->implicitAttributes,
                            [$attribute => [$key]]
                        );

$results = $this->mergeRules($results, $compiled->rules);
                    } else {
                        $this->implicitAttributes[$attribute][] = $key;

$results = $this->mergeRules($results, $key, $rule);
                    }
                }
            }
        }

return $results;
    }

/**
     * Merge additional rules into a given attribute(s).
     *
     * @param  array  $results
     * @param  string|array  $attribute
     * @param  string|array  $rules
     * @return array
     */
    public function mergeRules($results, $attribute, $rules = [])
    {
        if (is_array($attribute)) {
            foreach ((array) $attribute as $innerAttribute => $innerRules) {
                $results = $this->mergeRulesForAttribute($results, $innerAttribute, $innerRules);
            }

return $results;
        }

return $this->mergeRulesForAttribute(
            $results, $attribute, $rules
        );
    }

/**
     * Merge additional rules into a given attribute.
     *
     * @param  array  $results
     * @param  string  $attribute
     * @param  string|array  $rules
     * @return array
     */
    protected function mergeRulesForAttribute($results, $attribute, $rules)
    {
        $merge = head($this->explodeRules([$rules]));

$results[$attribute] = array_merge(
            isset($results[$attribute]) ? $this->explodeExplicitRule($results[$attribute], $attribute) : [], $merge
        );

return $results;
    }

/**
     * Extract the rule name and parameters from a rule.
     *
     * @param  array|string  $rule
     * @return array
     */
    public static function parse($rule)
    {
        if ($rule instanceof RuleContract || $rule instanceof NestedRules) {
            return [$rule, []];
        }

if (is_array($rule)) {
            $rule = static::parseArrayRule($rule);
        } else {
            $rule = static::parseStringRule($rule);
        }

$rule[0] = static::normalizeRule($rule[0]);

return $rule;
    }

/**
     * Parse an array based rule.
     *
     * @param  array  $rule
     * @return array
     */
    protected static function parseArrayRule(array $rule)
    {
        return [Str::studly(trim(Arr::get($rule, 0, ''))), array_slice($rule, 1)];
    }

/**
     * Parse a string based rule.
     *
     * @param  string  $rule
     * @return array
     */
    protected static function parseStringRule($rule)
    {
        $parameters = [];

// The format for specifying validation rules and parameters follows an
        // easy {rule}:{parameters} formatting convention. For instance the
        // rule "Max:3" states that the value may only be three letters.
        if (str_contains($rule, ':')) {
            [$rule, $parameter] = explode(':', $rule, 2);

$parameters = static::parseParameters($rule, $parameter);
        }

return [Str::studly(trim($rule)), $parameters];
    }

/**
     * Parse a parameter list.
     *
     * @param  string  $rule
     * @param  string  $parameter
     * @return array
     */
    protected static function parseParameters($rule, $parameter)
    {
        return static::ruleIsRegex($rule) ? [$parameter] : str_getcsv($parameter);
    }

/**
     * Determine if the rule is a regular expression.
     *
     * @param  string  $rule
     * @return bool
     */
    protected static function ruleIsRegex($rule)
    {
        return in_array(strtolower($rule), ['regex', 'not_regex', 'notregex'], true);
    }

/**
     * Normalizes a rule so that we can accept short types.
     *
     * @param  string  $rule
     * @return string
     */
    protected static function normalizeRule($rule)
    {
        return match ($rule) {
            'Int' => 'Integer',
            'Bool' => 'Boolean',
            default => $rule,
        };
    }

/**
     * Expand and conditional rules in the given array of rules.
     *
     * @param  array  $rules
     * @param  array  $data
     * @return array
     */
    public static function filterConditionalRules($rules, array $data = [])
    {
        return collect($rules)->mapWithKeys(function ($attributeRules, $attribute) use ($data) {
            if (! is_array($attributeRules) &&
                ! $attributeRules instanceof ConditionalRules) {
                return [$attribute => $attributeRules];
            }

if ($attributeRules instanceof ConditionalRules) {
                return [$attribute => $attributeRules->passes($data)
                                ? array_filter($attributeRules->rules($data))
                                : array_filter($attributeRules->defaultRules($data)), ];
            }

return [$attribute => collect($attributeRules)->map(function ($rule) use ($data) {
                if (! $rule instanceof ConditionalRules) {
                    return [$rule];
                }

return $rule->passes($data) ? $rule->rules($data) : $rule->defaultRules($data);
            })->filter()->flatten(1)->values()->all()];
        })->all();
    }
}

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