Implement positive-int and negative-int types

Author: ondrejmirtes

resources/functionMap.php

@@ -11785,7 +11785,7 @@
 'strncasecmp' => ['int', 'str1'=>'string', 'str2'=>'string', 'len'=>'int'],
 'strncmp' => ['int', 'str1'=>'string', 'str2'=>'string', 'len'=>'int'],
 'strpbrk' => ['string|false', 'haystack'=>'string', 'char_list'=>'string'],
-'strpos' => ['int|false', 'haystack'=>'string', 'needle'=>'string|int', 'offset='=>'int'],
+'strpos' => ['positive-int|0|false', 'haystack'=>'string', 'needle'=>'string|int', 'offset='=>'int'],
 'strptime' => ['array|false', 'datestr'=>'string', 'format'=>'string'],
 'strrchr' => ['string|false', 'haystack'=>'string', 'needle'=>'mixed'],
 'strrev' => ['string', 'str'=>'string'],

src/PhpDoc/TypeNodeResolver.php

@@ -45,6 +45,7 @@
 use PHPStan\Type\FloatType;
 use PHPStan\Type\Generic\GenericClassStringType;
 use PHPStan\Type\Generic\GenericObjectType;
+use PHPStan\Type\IntegerRangeType;
 use PHPStan\Type\IntegerType;
 use PHPStan\Type\IntersectionType;
 use PHPStan\Type\IterableType;
@@ -129,6 +130,12 @@ private function resolveIdentifierTypeNode(IdentifierTypeNode $typeNode, NameSco
 			case 'integer':
 				return new IntegerType();
 
+			case 'positive-int':
+				return IntegerRangeType::fromInterval(1, null);
+
+			case 'negative-int':
+				return IntegerRangeType::fromInterval(null, -1);
+
 			case 'string':
 				return new StringType();
 

tests/PHPStan/Analyser/NodeScopeResolverTest.php

@@ -10199,6 +10199,11 @@ public function dataBug1924(): array
 		return $this->gatherAssertTypes(__DIR__ . '/data/bug-1924.php');
 	}
 
+	public function dataExtraIntTypes(): array
+	{
+		return $this->gatherAssertTypes(__DIR__ . '/data/extra-int-types.php');
+	}
+
 	/**
 	 * @dataProvider dataBug2574
 	 * @dataProvider dataBug2577
@@ -10281,6 +10286,7 @@ public function dataBug1924(): array
 	 * @dataProvider dataClassConstantOnExpression
 	 * @dataProvider dataBug3961
 	 * @dataProvider dataBug1924
+	 * @dataProvider dataExtraIntTypes
 	 * @param string $assertType
 	 * @param string $file
 	 * @param mixed ...$args

tests/PHPStan/Analyser/data/extra-int-types.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace ExtraIntTypes;
+
+use function PHPStan\Analyser\assertType;
+
+class Foo
+{
+
+	/**
+	 * @param positive-int $positiveInt
+	 * @param negative-int $negativeInt
+	 */
+	public function doFoo(
+		int $positiveInt,
+		int $negativeInt,
+		string $str
+	): void
+	{
+		assertType('int<1, max>', $positiveInt);
+		assertType('int<min, -1>', $negativeInt);
+		assertType('false', strpos('u', $str) === -1);
+		assertType('true', strpos('u', $str) !== -1);
+	}
+
+}