Feature: add Option::ify() & Option::tryIfy()

src/functions/option.php

@@ -108,6 +108,61 @@ function tryOf(
     }
 }
 
+/**
+ * Wrap a callable into one that return transform its result into an `Option`.
+ * It will be a `Some` option containing the result if it is different from `$noneValue` (default `null`).
+ *
+ * # Examples
+ *
+ * ```
+ * self::assertEq(Option\ify(strtotime(...), noneValue: false)("nope"), Option\none());
+ * self::assertEq(Option\ify(strtotime(...))("2015-09-21 UTC at midnight"), Option\some(1_442_793_600));
+ * ```
+ *
+ * @template U
+ * @param callable():U $callback
+ * @return \Closure(mixed...):Option<U>
+ */
+function ify(callable $callback, mixed $noneValue = null, bool $strict = true): \Closure
+{
+    return static fn (...$args) => Option\fromValue($callback(...$args), $noneValue, $strict);
+}
+
+/**
+ * Wrap a callable into one that return transform its result into an `Option` like `Option\ify()` does
+ * but also return `Option\None` if it an exception matching $exceptionClass was thrown.
+ *
+ * # Examples
+ *
+ * ```
+ * self::assertEq(Option\ify(strtotime(...), noneValue: false)("nope"), Option\none());
+ * self::assertEq(Option\ify(strtotime(...))("2015-09-21 UTC at midnight"), Option\some(1_442_793_600));
+ * ```
+ *
+ * @template U
+ * @param callable():U $callback
+ * @return \Closure(mixed...):Option<U>
+ */
+function tryIfy(
+    callable $callback,
+    mixed $noneValue = null,
+    bool $strict = true,
+    string $exceptionClass = \Exception::class,
+): \Closure
+{
+    return static function (...$args) use ($callback, $noneValue, $strict, $exceptionClass): mixed {
+        try {
+            return Option\fromValue($callback(...$args), $noneValue, $strict);
+        } catch (\Throwable $th) {
+            if (\is_a($th, $exceptionClass)) {
+                return Option\none();
+            }
+
+            throw $th;
+        }
+    };
+}
+
 /**
  * Converts from `Option<Option<T>>` to `Option<T>`.
  *

tests/Unit/Option/IfyTest.php

@@ -0,0 +1,72 @@
+<?php declare(strict_types=1);
+
+namespace TH\Maybe\Tests\Unit\Option;
+
+use PHPUnit\Framework\Assert;
+use PHPUnit\Framework\TestCase;
+use TH\Maybe\Option;
+use TH\Maybe\Tests\Provider;
+
+final class IfyTest extends TestCase
+{
+    use Provider\Values;
+
+    /**
+     * @dataProvider fromValueMatrix
+     * @param Option<mixed> $expected
+     */
+    public function testIfy(Option $expected, mixed $value, mixed $noneValue, bool $strict = true): void
+    {
+        Assert::assertEquals($expected, Option\ify(static fn () => $value, $noneValue, strict: $strict)());
+    }
+
+    /**
+     * @dataProvider fromValueMatrix
+     * @param Option<mixed> $expected
+     */
+    public function testTryOf(Option $expected, mixed $value, mixed $noneValue, bool $strict = true): void
+    {
+        Assert::assertEquals($expected, Option\tryIfy(static fn () => $value, $noneValue, strict: $strict)());
+    }
+
+    public function testOfDefaultToNull(): void
+    {
+        Assert::assertEquals(Option\none(), Option\ify(static fn () => null)());
+        Assert::assertEquals(Option\some(1), Option\ify(static fn () => 1)());
+    }
+
+    public function testTryOfDefaultToNull(): void
+    {
+        Assert::assertEquals(Option\none(), Option\tryIfy(static fn () => null)());
+        Assert::assertEquals(Option\some(1), Option\tryIfy(static fn () => 1)());
+    }
+
+    public function testOfDefaultToStrict(): void
+    {
+        $o = (object)[];
+
+        Assert::assertEquals(Option\none(), Option\ify(static fn () => $o, (object)[], strict: false)());
+        Assert::assertEquals($o, Option\ify(static fn () => $o, (object)[])()->unwrap());
+    }
+
+    public function testTryOfDefaultToStrict(): void
+    {
+        $o = (object)[];
+
+        Assert::assertEquals(Option\none(), Option\tryIfy(static fn () => $o, (object)[], strict: false)());
+        Assert::assertEquals($o, Option\tryIfy(static fn () => $o, (object)[])()->unwrap());
+    }
+
+    public function testTryOfExeptions(): void
+    {
+        // @phpstan-ignore-next-line
+        Assert::assertEquals(Option\tryIfy(static fn () => new \DateTimeImmutable("none"))(), Option\none());
+
+        try {
+            // @phpstan-ignore-next-line
+            Assert::assertEquals(Option\tryIfy(static fn () => 1 / 0)(), Option\none());
+            Assert::fail("An exception should have been thrown");
+        } catch (\DivisionByZeroError) {
+        }
+    }
+}