284 lines
16 KiB
Markdown
284 lines
16 KiB
Markdown
Webmozart Assert
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================
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[](https://travis-ci.org/webmozart/assert)
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[](https://ci.appveyor.com/project/webmozart/assert/branch/master)
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[](https://scrutinizer-ci.com/g/webmozart/assert/?branch=master)
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[](https://packagist.org/packages/webmozart/assert)
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[](https://packagist.org/packages/webmozart/assert)
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This library contains efficient assertions to test the input and output of
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your methods. With these assertions, you can greatly reduce the amount of coding
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needed to write a safe implementation.
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All assertions in the [`Assert`] class throw an `\InvalidArgumentException` if
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they fail.
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FAQ
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---
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**What's the difference to [beberlei/assert]?**
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This library is heavily inspired by Benjamin Eberlei's wonderful [assert package],
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but fixes a usability issue with error messages that can't be fixed there without
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breaking backwards compatibility.
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This package features usable error messages by default. However, you can also
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easily write custom error messages:
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```
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Assert::string($path, 'The path is expected to be a string. Got: %s');
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```
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In [beberlei/assert], the ordering of the `%s` placeholders is different for
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every assertion. This package, on the contrary, provides consistent placeholder
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ordering for all assertions:
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* `%s`: The tested value as string, e.g. `"/foo/bar"`.
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* `%2$s`, `%3$s`, ...: Additional assertion-specific values, e.g. the
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minimum/maximum length, allowed values, etc.
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Check the source code of the assertions to find out details about the additional
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available placeholders.
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Installation
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------------
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Use [Composer] to install the package:
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```
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$ composer require webmozart/assert
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```
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Example
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-------
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```php
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use Webmozart\Assert\Assert;
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class Employee
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{
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public function __construct($id)
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{
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Assert::integer($id, 'The employee ID must be an integer. Got: %s');
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Assert::greaterThan($id, 0, 'The employee ID must be a positive integer. Got: %s');
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}
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}
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```
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If you create an employee with an invalid ID, an exception is thrown:
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```php
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new Employee('foobar');
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// => InvalidArgumentException:
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// The employee ID must be an integer. Got: string
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new Employee(-10);
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// => InvalidArgumentException:
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// The employee ID must be a positive integer. Got: -10
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```
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Assertions
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----------
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The [`Assert`] class provides the following assertions:
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### Type Assertions
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Method | Description
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-------------------------------------------------------- | --------------------------------------------------
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`string($value, $message = '')` | Check that a value is a string
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`stringNotEmpty($value, $message = '')` | Check that a value is a non-empty string
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`integer($value, $message = '')` | Check that a value is an integer
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`integerish($value, $message = '')` | Check that a value casts to an integer
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`float($value, $message = '')` | Check that a value is a float
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`numeric($value, $message = '')` | Check that a value is numeric
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`natural($value, $message= ''')` | Check that a value is a non-negative integer
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`boolean($value, $message = '')` | Check that a value is a boolean
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`scalar($value, $message = '')` | Check that a value is a scalar
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`object($value, $message = '')` | Check that a value is an object
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`resource($value, $type = null, $message = '')` | Check that a value is a resource
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`isCallable($value, $message = '')` | Check that a value is a callable
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`isArray($value, $message = '')` | Check that a value is an array
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`isTraversable($value, $message = '')` (deprecated) | Check that a value is an array or a `\Traversable`
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`isIterable($value, $message = '')` | Check that a value is an array or a `\Traversable`
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`isCountable($value, $message = '')` | Check that a value is an array or a `\Countable`
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`isInstanceOf($value, $class, $message = '')` | Check that a value is an `instanceof` a class
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`isInstanceOfAny($value, array $classes, $message = '')` | Check that a value is an `instanceof` at least one class on the array of classes
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`notInstanceOf($value, $class, $message = '')` | Check that a value is not an `instanceof` a class
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`isAOf($value, $class, $message = '')` | Check that a value is of the class or has one of its parents
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`isAnyOf($value, array $classes, $message = '')` | Check that a value is of at least one of the classes or has one of its parents
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`isNotA($value, $class, $message = '')` | Check that a value is not of the class or has not one of its parents
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`isArrayAccessible($value, $message = '')` | Check that a value can be accessed as an array
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`uniqueValues($values, $message = '')` | Check that the given array contains unique values
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### Comparison Assertions
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Method | Description
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----------------------------------------------- | ------------------------------------------------------------------
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`true($value, $message = '')` | Check that a value is `true`
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`false($value, $message = '')` | Check that a value is `false`
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`notFalse($value, $message = '')` | Check that a value is not `false`
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`null($value, $message = '')` | Check that a value is `null`
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`notNull($value, $message = '')` | Check that a value is not `null`
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`isEmpty($value, $message = '')` | Check that a value is `empty()`
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`notEmpty($value, $message = '')` | Check that a value is not `empty()`
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`eq($value, $value2, $message = '')` | Check that a value equals another (`==`)
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`notEq($value, $value2, $message = '')` | Check that a value does not equal another (`!=`)
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`same($value, $value2, $message = '')` | Check that a value is identical to another (`===`)
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`notSame($value, $value2, $message = '')` | Check that a value is not identical to another (`!==`)
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`greaterThan($value, $value2, $message = '')` | Check that a value is greater than another
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`greaterThanEq($value, $value2, $message = '')` | Check that a value is greater than or equal to another
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`lessThan($value, $value2, $message = '')` | Check that a value is less than another
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`lessThanEq($value, $value2, $message = '')` | Check that a value is less than or equal to another
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`range($value, $min, $max, $message = '')` | Check that a value is within a range
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`inArray($value, array $values, $message = '')` | Check that a value is one of a list of values
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`oneOf($value, array $values, $message = '')` | Check that a value is one of a list of values (alias of `inArray`)
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### String Assertions
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You should check that a value is a string with `Assert::string()` before making
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any of the following assertions.
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Method | Description
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--------------------------------------------------- | -----------------------------------------------------------------
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`contains($value, $subString, $message = '')` | Check that a string contains a substring
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`notContains($value, $subString, $message = '')` | Check that a string does not contain a substring
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`startsWith($value, $prefix, $message = '')` | Check that a string has a prefix
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`notStartsWith($value, $prefix, $message = '')` | Check that a string does not have a prefix
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`startsWithLetter($value, $message = '')` | Check that a string starts with a letter
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`endsWith($value, $suffix, $message = '')` | Check that a string has a suffix
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`notEndsWith($value, $suffix, $message = '')` | Check that a string does not have a suffix
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`regex($value, $pattern, $message = '')` | Check that a string matches a regular expression
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`notRegex($value, $pattern, $message = '')` | Check that a string does not match a regular expression
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`unicodeLetters($value, $message = '')` | Check that a string contains Unicode letters only
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`alpha($value, $message = '')` | Check that a string contains letters only
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`digits($value, $message = '')` | Check that a string contains digits only
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`alnum($value, $message = '')` | Check that a string contains letters and digits only
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`lower($value, $message = '')` | Check that a string contains lowercase characters only
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`upper($value, $message = '')` | Check that a string contains uppercase characters only
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`length($value, $length, $message = '')` | Check that a string has a certain number of characters
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`minLength($value, $min, $message = '')` | Check that a string has at least a certain number of characters
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`maxLength($value, $max, $message = '')` | Check that a string has at most a certain number of characters
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`lengthBetween($value, $min, $max, $message = '')` | Check that a string has a length in the given range
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`uuid($value, $message = '')` | Check that a string is a valid UUID
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`ip($value, $message = '')` | Check that a string is a valid IP (either IPv4 or IPv6)
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`ipv4($value, $message = '')` | Check that a string is a valid IPv4
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`ipv6($value, $message = '')` | Check that a string is a valid IPv6
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`email($value, $message = '')` | Check that a string is a valid e-mail address
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`notWhitespaceOnly($value, $message = '')` | Check that a string contains at least one non-whitespace character
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### File Assertions
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Method | Description
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----------------------------------- | --------------------------------------------------
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`fileExists($value, $message = '')` | Check that a value is an existing path
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`file($value, $message = '')` | Check that a value is an existing file
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`directory($value, $message = '')` | Check that a value is an existing directory
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`readable($value, $message = '')` | Check that a value is a readable path
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`writable($value, $message = '')` | Check that a value is a writable path
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### Object Assertions
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Method | Description
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----------------------------------------------------- | --------------------------------------------------
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`classExists($value, $message = '')` | Check that a value is an existing class name
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`subclassOf($value, $class, $message = '')` | Check that a class is a subclass of another
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`interfaceExists($value, $message = '')` | Check that a value is an existing interface name
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`implementsInterface($value, $class, $message = '')` | Check that a class implements an interface
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`propertyExists($value, $property, $message = '')` | Check that a property exists in a class/object
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`propertyNotExists($value, $property, $message = '')` | Check that a property does not exist in a class/object
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`methodExists($value, $method, $message = '')` | Check that a method exists in a class/object
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`methodNotExists($value, $method, $message = '')` | Check that a method does not exist in a class/object
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### Array Assertions
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Method | Description
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-------------------------------------------------- | ------------------------------------------------------------------
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`keyExists($array, $key, $message = '')` | Check that a key exists in an array
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`keyNotExists($array, $key, $message = '')` | Check that a key does not exist in an array
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`validArrayKey($key, $message = '')` | Check that a value is a valid array key (int or string)
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`count($array, $number, $message = '')` | Check that an array contains a specific number of elements
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`minCount($array, $min, $message = '')` | Check that an array contains at least a certain number of elements
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`maxCount($array, $max, $message = '')` | Check that an array contains at most a certain number of elements
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`countBetween($array, $min, $max, $message = '')` | Check that an array has a count in the given range
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`isList($array, $message = '')` | Check that an array is a non-associative list
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`isNonEmptyList($array, $message = '')` | Check that an array is a non-associative list, and not empty
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`isMap($array, $message = '')` | Check that an array is associative and has strings as keys
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`isNonEmptyMap($array, $message = '')` | Check that an array is associative and has strings as keys, and is not empty
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### Function Assertions
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Method | Description
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------------------------------------------- | -----------------------------------------------------------------------------------------------------
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`throws($closure, $class, $message = '')` | Check that a function throws a certain exception. Subclasses of the exception class will be accepted.
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### Collection Assertions
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All of the above assertions can be prefixed with `all*()` to test the contents
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of an array or a `\Traversable`:
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```php
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Assert::allIsInstanceOf($employees, 'Acme\Employee');
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```
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### Nullable Assertions
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All of the above assertions can be prefixed with `nullOr*()` to run the
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assertion only if it the value is not `null`:
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```php
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Assert::nullOrString($middleName, 'The middle name must be a string or null. Got: %s');
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```
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### Extending Assert
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The `Assert` class comes with a few methods, which can be overridden to change the class behaviour. You can also extend it to
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add your own assertions.
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#### Overriding methods
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Overriding the following methods in your assertion class allows you to change the behaviour of the assertions:
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* `public static function __callStatic($name, $arguments)`
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* This method is used to 'create' the `nullOr` and `all` versions of the assertions.
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* `protected static function valueToString($value)`
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* This method is used for error messages, to convert the value to a string value for displaying. You could use this for representing a value object with a `__toString` method for example.
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* `protected static function typeToString($value)`
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* This method is used for error messages, to convert the a value to a string representing its type.
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* `protected static function strlen($value)`
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* This method is used to calculate string length for relevant methods, using the `mb_strlen` if available and useful.
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* `protected static function reportInvalidArgument($message)`
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* This method is called when an assertion fails, with the specified error message. Here you can throw your own exception, or log something.
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Authors
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-------
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* [Bernhard Schussek] a.k.a. [@webmozart]
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* [The Community Contributors]
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Contribute
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----------
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Contributions to the package are always welcome!
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* Report any bugs or issues you find on the [issue tracker].
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* You can grab the source code at the package's [Git repository].
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License
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-------
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All contents of this package are licensed under the [MIT license].
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[beberlei/assert]: https://github.com/beberlei/assert
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[assert package]: https://github.com/beberlei/assert
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[Composer]: https://getcomposer.org
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[Bernhard Schussek]: https://webmozarts.com
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[The Community Contributors]: https://github.com/webmozart/assert/graphs/contributors
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[issue tracker]: https://github.com/webmozart/assert/issues
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[Git repository]: https://github.com/webmozart/assert
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[@webmozart]: https://twitter.com/webmozart
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[MIT license]: LICENSE
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[`Assert`]: src/Assert.php
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