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Informations about the package values

stubbles/values

Useful classes to ease the work with values.

Build status

Tests

Latest Stable Version

Installation

stubbles/values is distributed as Composer package. To install it as a dependency of your package use the following command:

composer require "stubbles/values": "^11.0"

Requirements

stubbles/values requires at least PHP 8.2.

Available classes

stubbles\values\Result

Enables to wrap a return value which might be null. In other languages or libraries this is known as an Optional. To create an instance call Result::of(someCallThatMightReturnNull()).

isPresent()

Returns true when result contains a value which is not null.

isEmpty()

Returns true when result contains an empty value. Please note that this method will always return false in case the value is an integer, even if it is 0.

value()

Returns the actual value.

filter(callable $predicate)

Allows to filter the value. In case the value fulfills the given predicate the Result instance is returned. If the value does not fulfill the predicate the equivalent of Result::of(null) is returned.

map(callable $mapper)

Maps the value using the given mapper into a different result. In case the value is null the return value still is equivalent to Result::of(null).

whenNull($other)

Returns the result if value is present, or result of other.

applyWhenNull(callable $other)

Returns the result if value is present, or the result of applied other.

whenEmpty($other)

Returns the result if value is not empty, or result of other.

applyWhenEmpty($other)

Returns the result if value is not empty, or result of applied other.

stubbles\values\Secret

Secret provides a reasonable secure storage for security-sensitive lists of characters, such as passwords.

It prevents accidentially revealing them in output, by var_dump()ing, echo()ing, or casting the object to array. All these cases will not show the password, nor the crypt of it.

However, it is not safe to consider this implementation secure in a crypto- graphically sense, because it does not care for a very strong encryption, and it does share the encryption key with all instances of it in a single PHP instance.

When using this class, you must make sure not to extract the secured string and pass it to a place where an exception might occur, as it might be exposed as method argument.

Instances of this class can not be serialized.

Create a secret

To create a secret call Secret::create('my secret value').

Please note that you can not use this function to create a secret with value null. If you explicitly want to do that use Secret::forNull().

isContained(): bool

Checks whether encryption on creation was successful. In case it failed no errors or exception is thrown, so this is the only way to check.

isNull(): bool

Checks if actual secret is null.

unveil(): string

Unveils the secret and returns it as a string. This should be called at the latest possible moment to avoid unneccessary revealing of the value to be intended stored secure.

substring(int $start, int $length = null): Secret

Creates a substring of the secret value as new Secret instance.

Please note that this method is deprecated since release 10.0.0 and will be removed with 11.0.0.

length(): int

Returns length of the secret. Allows to check if it would fit a certain place without the need to unveil it first.

stubbles\values\Parse

Provides methods for parsing strings to a target type.

Parse::toInt($value)

Parses integer value from given string.

Parse::toFloat($value)

Parses float value from given string.

Parse::toBool($string)

Parses boolean value from given string. The return value is true if the string value is either "1", "yes", "true" or "on". In any other case the return value will be false.

Parse::toList($string, string $separator = '|')

Parses string to a list of strings.

If the value is empty the return value will be an empty array. If the value is not empty it will be splitted at "|" (or any other separator provided).

Parse::toMap($string)

Parses string to a map.

If the value is empty the return value will be an empty map. If the value is not empty it will be splitted at "|". The resulting list will be splitted at the first ":", the first part becoming the key and the remainer becoming the value in the map. If no ":" is present, the whole value will be appended to the map using a numeric value for the key.

Parse::toRange($string)

Parses string to a range.

Ranges can be written as 1..5 which will return an array: [1, 2, 3, 4, 5]. Works also with letters and reverse order a..e, e..a and 5..1.

Parse::toClass($string)

Parses string to a reflection class.

String must have the format fully\qualified\Classname.class. In case the string can not be parsed the return value is null.

Parse::toClassname($string)

Parses string as existing class name.

String must have the format fully\qualified\Classname::class. In case the string can not be parsed or the class does not exist the return value is null.

stubbles\values\Properties

Provides a convenient way to read property files and make their values accessible. Properties can both be read from a string you might have in memory or from a file:

Properties consist of sections, which each has a list of key-value pairs. Suppose the following properties file:

Here, the properties consists of the sections config and other, where both have different key-value pairs, cool.stuff and interesting belong to config and the other two to other.

You can get the raw value of a property:

However, that might not be what you wanted to achieve. Rather, you would like to have a correct type. That's where the parse*() methods come into play:

parse(string $section, string $key)->asInt(): ?int

Tries to read the value and convert it to int.

If you want to have a default value in case the section or key is not set, use parse($section, $key)->defaultingTo(42)->asInt(). Please note that the given default value must be of type int.

parse(string $section, string $key)->asFloat(): ?float

Tries to read the value and convert it to float.

If you want to have a default value in case the section or key is not set, use parse($section, $key)->defaultingTo(3.03)->asFloat(). Please note that the given default value must be of type float.

parse(string $section, string $key)->asBool(): ?bool

Tries to read the value and convert it to boolean.

The following value contents will be converted to true:

All other values will evaluate to false.

If you want to have a default value of true in case the section or key is not set, use parse($section, $key)->defaultingTo(true)->asBool(). Please note that the given default value must be of type bool. It is not required to explicitly specify false as default value. In case the section or key is not set false will be the return default value if not specified otherwise.

parse(string $section, string $key)->asList(): ?array

Tries to read the value and convert it to a list (array with integers as key).

If the value is empty the return value will be an empty array. If the value is not empty it will be splitted at |. So if the value would be key = foo|bar|baz it gets converted to ['foo', 'bar', 'baz'].

If you want to have a default value in case the section or key is not set, use parse($section, $key)->defaultingTo(['foo', 'bar'])->asList(). Please note that the given default value must be of type array.

parse(string $section, string $key)->asMap(): ?array

Tries to read the value and convert it to a hashmap.

If the value is empty the return value will be an empty hash. If the value is not empty it will be splitted at |. The resulting array will be splitted at the first :, the first part becoming the key and the remaining part becoming the value in the hash. If no : is present, the whole value will be appended to the hash using a numeric value. So key = foo:bar|baz results in ['foo' => 'bar', 'baz'].

If you want to have a default value in case the section or key is not set, use parse($section, $key)->defaultingTo(['foo' => 'bar'])->asMap(). Please note that the given default value must be of type array.

parse(string $section, string $key)->asRange(): ?array

Tries to read the value and convert it to a range.

Ranges in properties should be written as key = 1..5 the resulting value is [1, 2, 3, 4, 5].

This works also with letters and reverse order:

letters = a..e
letter_reverse = e..a
numbers_reverse = 5..1

If you want to have a default value in case the section or key is not set, use parse($section, $key)->defaultingTo([1, 2, 3])->asRange(). Please note that the given default value must be of type array.

parse(string $section, string $key)->asClass(): ?ReflectionClass

Tries to read the value and convert it to an instance of ReflectionClass for the class name.

Classes in properties should be written as _key = foo\bar\Baz.class.

If you want to have a default value in case the section or key is not set, use parse($section, $key)->defaultingTo(new ReflectionClass(stdClass::class))->asClass(). Please note that the given default value must be of type ReflectionClass.

Passwords

Available since release 4.0.0

Since release 4.0.0, properties with key password will be stored as an instance of stubbles|values\Secret. This will also be the return value when requesting the value of such a property.

Modifiable properties

Available since release 1.7.0

By default properties are read only. In case you need modifiable properties use the stubbles\values\ModifiableProperties class. It provides means to set property values:

setSection(string $section, array $data)

Sets a complete section with given section name. In case this section already exists it will be replaced.

setValue(string $section, string $name, $value)

Sets a single property value.

setBooleanValue(string $section, string $name, $value)

Sets a single property to a boolean value in a way that it can be read properly by parseBool().

setArrayValue(string $section, string $name, array $value)

Sets an array property to a value in a way that it can be read properly by parseArray().

setHashValue(string $section, string $name, array $hash)

Sets a map property to a value in a way that it can be read properly by parseHash().

setRangeValue(string $section, string $name, array $range)

Sets a range property to a value in a way that it can be read properly by parseRange().

unmodifiable()

Available since release 4.0.0

Returns an unmodifiable instance from the modifiable properties.

stubbles\values\ResourceLoader

Available since release 7.1.0

Description

The stubbles\values\ResourceLoader allows to load resources from different locations. It relies on the root path as described below.

In stubbles/values, a resource is defined as any kind of file which is located in the path src/main/resources of the current project, or in src/main/resources of any other Composer package located in vendor.

open(string $resource, string $withClass = 'stubbles\streams\file\FileInputStream')

Opens the given resource to read its contents using the given $withClass. This class must accept the resource path as constructor argument. By default the class stubbles\streams\file\FileInputStream will be used, but the package stubbles/streams which provides this class must be required in your project.

Resource can either be a complete path to a resource or a local path. In case it is a local path it is searched within the src/main/resources folder of the current project.

It is not possible to open resources outside of the root path by providing a complete path, a complete path must always lead to a resource located within the root path.

load(string $resource)

Loads resource contents. Resource can either be a complete path to a resource or a local path. In case it is a local path it is searched within the src/main/resources folder of the current project.

It is not possible to load resources outside of the root path by providing a complete path, a complete path must always lead to a resource located within the root path.

loadWith(string $resource, callable $loader)

Loads resource contents. Resource can either be a complete path to a resource or a local path. In case it is a local path it is searched within the src/main/resources folder of the current project.

It is not possible to load resources outside of the root path by providing a complete path, a complete path must always lead to a resource located within the root path.

The given $loader must accept a path and return the result from the load operation:

availableResourceUris(string $resourceName): array

Returns a list of all available URIs for a resource. The returned list is sorted alphabetically, meaning that local resources of the current project are always returned as first entry if they exist, and all vendor resources after. Order of vendor resources is also in alphabetical order of vendor/package names.

stubbles\values\Rootpath

Available since release 7.1.0

Description

The root path within a project is represented by stubbles\values\Rootpath. It is defined as the path in which the whole application resides. When an instance is created and no argument is provided, the class will calculate the root path by checking the following locations:

For unit tests it can be useful to supply the actual root path to be used for the test directly when constructing the class.

to(string ...$path): string

Returns absolute path to given local path. Supports arbitrary lists of arguments, e.g. $rootpath->to('src', 'main', 'php', 'Example.php') will return /absolute/path/to/root/src/main/php/Example.php.

contains(string $path): bool

Checks if given path is located within root path.

sourcePathes(): array

Returns a list of all source pathes defined for the autoloader. It relies on autoloader files generated by Composer. If no such autoloader is present the list of source pathes will be empty.

Rootpath::default(): string

Available since release 8.1.0

A static method which returns the rootpath directly as string when not instance is required.

stubbles\values\Value

Available since release 7.2.0

Description

Represents a single value, mostly scalar ones, on which certain checks can be done. Some of the checks are built-in, but additional checks can be defined.

Create an instance with Value::of($someValue). In case $someValue is null a fixed value instance will be used. For all times there is only one instance of Value::of(null) - each creation with null will return the same instance.

To access the stored value call $actualValue = $value->value().

contains($needle): bool

Checks if the value contains the needle. In case the value is a string it is checked whether $needle is a substring within the value. In case the value is an array or an instance of \Traversable the given $needle must be an element within the array or traversable.

containsAnyOf(array $elements): bool

Checks if the value contains any of the given elements.

equals($expected): bool

Checks if the value equals the expected value. Expected value must be a non-null scalar value. Comparison is done using ===.

isOneOf(array $allowedValues, bool $strict = false): bool

Checks if the value equals one of the allowed values. In case the value itself is an array this method returns false if it contains a value which is not in the list of allowed values.

Sometimes it is necessary that the value type must also be equal. In such cases the flag $strict should be set to true.

isMatchedBy(string $regex): bool

Checks if the value can be matched by the given regular expression.

satisfies(callable $check): bool

Checks if the value satisfies the given callable. The given callable must accept a single value, its return value is returned.

isNull(): bool

Available since release 8.1.0

Checks if the value is null.

isEmpty(): bool

Available since release 8.1.0

Checks if the value is empty. A value is empty if it is null, an empty string or an empty array.

Define additional checks

Additional checks can be defined: Values::defineCheck('hasPower', function($value) { return 6100 == $value; });

After the definition this check can be used as follows: Value::of($someValue)->hasPower()

Existing PHP functions must not be defined, they are available automatically: Value::of($someValue)->is_int()

Available functions

stubbles\values\lastErrorMessage(): Result

Returns the message of the native PHP function error_get_last()['message'] as instance of stubbles\values\Result.

stubbles\values\typeOf(&$value): string

Returns the correct type of given value.

For objects the actual class name will be returned. In case of resources the return value will be _resource[type_ofresource], e.g. resource[stream]. For all other types the result is call to PHP's native gettype() function.

stubbles\values\pattern($pattern): Pattern

Available since release 7.1.0.

Creates a pattern from regular expression which can be used to match other string values.

The pattern uses preg_match() and checks if the value occurs exactly one time. Please make sure that the supplied regular expression contains correct delimiters, they will not be applied automatically. The matches() method throws a \RuntimeException in case the regular expression is invalid.


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