Rule/date time diff

docs/rules/DateTimeDiff.md

@@ -0,0 +1,63 @@
+# DateTimeDiff
+
+- `DateTimeDiff(Validatable $rule)`
+- `DateTimeDiff(Validatable $rule, string $type)`
+- `DateTimeDiff(Validatable $rule, string $type, string $format)`
+
+Validates the difference of date/time against a specific rule.
+
+The `$format` argument should follow PHP's [date()][] function. When the `$format` is not given, this rule accepts
+[Supported Date and Time Formats][] by PHP (see [strtotime()][]).
+
+The `$type` argument should follow PHP's [DateInterval] properties. When the `$type` is not given, its default value is `y`.
+
+```php
+v::dateTimeDiff(v::equal(7))->validate('7 years ago - 1 minute'); // true
+v::dateTimeDiff(v::equal(7))->validate('7 years ago + 1 minute'); // false
+
+v::dateTimeDiff(v::greaterThan(18), 'y', 'd/m/Y')->validate('09/12/1990'); // true
+v::dateTimeDiff(v::greaterThan(18), 'y', 'd/m/Y')->validate('09/12/2023'); // false
+
+v::dateTimeDiff(v::between(1, 18), 'm')->validate('5 months ago'); // true
+```
+
+The supported types are:
+
+* `years` as `y`
+* `months` as `m`
+* `days` as `days` and `d`
+* `hours` as `h`
+* `minutes` as `i`
+* `seconds` as `s`
+* `microseconds` as `f`
+
+Difference between `d` and `days`
+
+`d` (days): Represents the difference in days within the same month or year. For example, if the difference between two dates is 1 month and 10 days, the value of d will be 10.
+
+`days` (full days): Represents the total difference in days between two dates, regardless of months or years. For example, if the difference between two dates is 1 month and 10 days, the value of days will be the total number of days between these dates.
+
+## Categorization
+
+- Date and Time
+
+## Changelog
+
+| Version | Description                                |
+| ------: |--------------------------------------------|
+|   3.0.0 | Created from `Age`, `MinAge`, and `MaxAge` |
+
+***
+See also:
+
+- [Date](Date.md)
+- [DateTime](DateTime.md)
+- [Max](Max.md)
+- [Min](Min.md)
+- [Time](Time.md)
+
+[date()]: http://php.net/date
+[DateTimeInterface]: http://php.net/DateTimeInterface
+[strtotime()]: http://php.net/strtotime
+[Supported Date and Time Formats]: http://php.net/datetime.formats
+[DateInterval]: https://www.php.net/manual/en/class.dateinterval.php

library/Helpers/CanExtractRules.php

@@ -10,8 +10,11 @@
 namespace Respect\Validation\Helpers;
 
 use Respect\Validation\Exceptions\ComponentException;
+use Respect\Validation\Rules\Core\Composite;
+use Respect\Validation\Rules\Not;
 use Respect\Validation\Validatable;
 use Respect\Validation\Validator;
+use Throwable;
 
 use function array_map;
 use function count;
@@ -37,6 +40,40 @@
         return $rule;
     }
 
+    private function extractSiblingSuitableRule(Validatable $rule, Throwable $throwable): Validatable
+    {
+        $this->assertSingleRule($rule, $throwable);
+
+        if ($rule instanceof Validator) {
+            return $rule->getRules()[0];
+        }
+
+        return $rule;
+    }
+
+    private function assertSingleRule(Validatable $rule, Throwable $throwable): void
+    {
+        if ($rule instanceof Not) {
+            $this->assertSingleRule($rule->getRule(), $throwable);
+
+            return;
+        }
+
+        if ($rule instanceof Validator) {
+            if (count($rule->getRules()) !== 1) {
+                throw $throwable;
+            }
+
+            $this->assertSingleRule($rule->getRules()[0], $throwable);
+
+            return;
+        }
+
+        if ($rule instanceof Composite) {
+            throw $throwable;
+        }
+    }
+
     /**
      * @param array<Validatable> $rules
      *

library/Helpers/CanValidateDateTime.php

@@ -9,22 +9,24 @@
 
 namespace Respect\Validation\Helpers;
 
+use DateInterval;
 use DateTime;
 use DateTimeZone;
 
 use function checkdate;
 use function date_default_timezone_get;
 use function date_parse_from_format;
 use function preg_match;
+use function array_keys;
+use function in_array;
+use function get_object_vars;
+
 
 trait CanValidateDateTime
 {
     private function isDateTime(string $format, string $value): bool
     {
-        $exceptionalFormats = [
-            'c' => 'Y-m-d\TH:i:sP',
-            'r' => 'D, d M Y H:i:s O',
-        ];
+        $exceptionalFormats = $this->getExceptionalFormats();
 
         $format = $exceptionalFormats[$format] ?? $format;
 
@@ -59,6 +61,17 @@ private function isDateTimeParsable(array $info): bool
         return $info['error_count'] === 0 && $info['warning_count'] === 0;
     }
 
+    /**
+     * Validates if the given string is a valid DateInterval type.
+     * 
+     * @param string $age
+     * @return bool
+     */
+    private function isDateIntervalType(string $age): bool
+    {
+        return in_array($age, array_keys(get_object_vars((new DateInterval('P1Y')))));
+    }
+
     private function isDateFormat(string $format): bool
     {
         return preg_match('/[djSFmMnYy]/', $format) > 0;
@@ -75,4 +88,13 @@ private function isDateInformation(array $info): bool
 
         return checkdate($info['month'] ?: 1, 1, $info['year'] ?: 1);
     }
+
+    /** @return array<string, string> */
+    private function getExceptionalFormats(): array
+    {
+        return [
+            'c' => 'Y-m-d\TH:i:sP',
+            'r' => 'D, d M Y H:i:s O',
+        ];
+    }
 }

library/Rules/Core/Wrapper.php

@@ -50,4 +50,9 @@ public function setTemplate(string $template): static
 
         return $this;
     }
+
+    public function getRule(): Validatable
+    {
+        return $this->rule;
+    }
 }

library/Rules/DateTimeDiff.php

@@ -0,0 +1,152 @@
+<?php
+
+/*
+ * Copyright (c) Alexandre Gomes Gaigalas <[email protected]>
+ * SPDX-License-Identifier: MIT
+ */
+
+declare(strict_types=1);
+
+namespace Respect\Validation\Rules;
+
+use DateTimeImmutable;
+use DateTimeInterface;
+use Respect\Validation\Exceptions\InvalidRuleConstructorException;
+use Respect\Validation\Helpers\CanBindEvaluateRule;
+use Respect\Validation\Helpers\CanExtractRules;
+use Respect\Validation\Helpers\CanValidateDateTime;
+use Respect\Validation\Message\Template;
+use Respect\Validation\Result;
+use Respect\Validation\Rules\Core\Standard;
+use Respect\Validation\Validatable;
+
+use function is_scalar;
+
+#[Template(
+    'The number of {{type|raw}} between {{now|raw}} and',
+    'The number of {{type|raw}} between {{now|raw}} and',
+)]
+final class DateTimeDiff extends Standard
+{
+    use CanBindEvaluateRule;
+    use CanValidateDateTime;
+    use CanExtractRules;
+
+    private readonly Validatable $rule;
+
+    /** 
+     * @param string $type DateInterval format examples:
+     *  - 'y': years
+     *  - 'm': months
+     *  - 'd': days (within the same month or year)
+     *  - 'days': full days (total difference in days)
+     *  - 'h': hours
+     *  - 'i': minutes
+     *  - 's': seconds
+     *  - 'f': microseconds
+     * @param DateTimeImmutable|null $now The value that will be compared to the input
+    */
+    public function __construct(
+        Validatable $rule,
+        private readonly string $type = 'y',
+        private readonly ?string $format = null,
+        private readonly ?DateTimeImmutable $now = null,
+    ) {
+        if (!$this->isDateIntervalType($this->type)) {
+            throw new InvalidRuleConstructorException(
+                '"%s" is not a valid type of age (Available: %s)',
+                $this->type,
+                ['y', 'm', 'd', 'days', 'h', 'i', 's', 'f']
+            );
+        }
+        $this->rule = $this->extractSiblingSuitableRule(
+            $rule,
+            new InvalidRuleConstructorException('DateTimeDiff must contain exactly one rule')
+        );
+    }
+
+    public function evaluate(mixed $input): Result
+    {
+        $compareTo = $this->createDateTimeObject($input);
+        if ($compareTo === null) {
+            return Result::failed($input, $this);
+        }
+
+        $dateTimeResult = $this->bindEvaluate(
+            binded: new DateTime($this->format), 
+            binder: $this, 
+            input: $input
+        );
+        if (!$dateTimeResult->isValid) {
+            return $dateTimeResult;
+        }
+
+        $now = $this->now ?? new DateTimeImmutable();
+
+        $nextSibling = $this->rule
+            ->evaluate($this->comparisonValue($now, $compareTo))
+            ->withNameIfMissing($input instanceof DateTimeInterface ? $input->format('c') : $input);
+
+        $parameters = [
+            'type' => $this->getTranslatedType($this->type), 
+            'now' => $this->nowParameter($now)
+        ];
+
+        return (new Result($nextSibling->isValid, $input, $this, $parameters))->withNextSibling($nextSibling);
+    }
+
+    private function comparisonValue(DateTimeInterface $now, DateTimeInterface $compareTo)
+    {
+        return $compareTo->diff($now)->{$this->type};
+    }
+
+    private function nowParameter(DateTimeInterface $now): string
+    {
+        if ($this->format === null && $this->now === null) {
+            return 'now';
+        }
+
+        if ($this->format === null) {
+            return $now->format('Y-m-d H:i:s.u');
+        }
+
+        return $now->format($this->format);
+    }
+
+    private function createDateTimeObject(mixed $input): ?DateTimeInterface
+    {
+        if ($input instanceof DateTimeInterface) {
+            return $input;
+        }
+
+        if (!is_scalar($input)) {
+            return null;
+        }
+
+        if ($this->format === null) {
+            return new DateTimeImmutable((string) $input);
+        }
+
+        $format = $this->getExceptionalFormats()[$this->format] ?? $this->format;
+        $dateTime = DateTimeImmutable::createFromFormat($format, (string) $input);
+        if ($dateTime === false) {
+            return null;
+        }
+
+        return $dateTime;
+    }
+
+    private function getTranslatedType(string $type): string
+    {
+        return match ($type) {
+            'y' => 'years',
+            'm' => 'months',
+            'd' => 'days',
+            'days' => 'full days',
+            'h' => 'hours',
+            'i' => 'minutes',
+            's' => 'seconds',
+            'f' => 'microseconds',
+        };
+    }
+}