Data Mapper

Library for mapping and transforming data structures.

Defining mapper

Mapper configuration is a description of output structure defined as association:

[Key1 => Getter1, Key2 => Getter2 ...]

Key defines property name in output structure and Getter is a function that extracts value from input.

Examples

use DataMap\Getter\GetInteger;
use DataMap\Mapper;
use DataMap\Input\Input;

// Input structure is:
$input = [
    'name' => 'John',
    'surname' => 'Doe',
    'date_birth' => '1970-01-01',
    'address' => [
        'street' => 'Foo Street',
        'city' => [
            'name' => 'Bar Town',
            'country' => 'Neverland',
        ],
    ],
    'age' => '47',
];

// Required output structore is:
$output = [
    'firstName' => 'John',
    'fullName' => 'John Doe',
    'street' => 'Foo Street',
    'city' => 'Bar Town',
    'age' => 47,
    'birth' => new \DateTimeImmutable('1970-01-01'),
];

// Then mapping definition is:
$mapper = new Mapper([
    'firstName' => 'name',                          // simply get `name` from input and assign to `firstName` property
    'fullName' => function (Input $input): string {
        return $input->get('name') . ' ' . $input->get('surname');
    },                                              // use Closure as Getter function
    'street' => 'address.street',                   // get values from nested structures
    'city' => 'address.city.name',
    'age' => new GetInteger('age'),                 // use one of predefined getters
    'birth' => new GetDate('date_birth'),           // get date as `\DateTimeImmutable` object
]);

// Map $input to $output:
$output = $mapper->map($input);

// Map collection of entries:
$outputCollection = array_map($mapper, $inputCollection);

// Extend mapper definition:
$newMapper = $mapper->withAddedMap(['country' => 'address.city.country']);

Getter function

Getter generally can be described as interface:

use DataMap\Input\Input;

interface Getter
{
    /**
     * @return mixed
     */
    public function __invoke(Input $input);
}

There are 2 forms of defining map:

Getter can be string which is shorthand for new GetRaw('key').
Getter can also be a closure or any other callable. It will receive DataMap\Input\Input as first argument and original input as second argument. Getter interface is not required, it's just a hint.

Predefined Getters

`new GetRaw($key, $default)`

Get value by property path without additional transformation.

$mapper = new Mapper([
    'name' => new GetRaw('first_name'),
    // same as:  
    'name' => 'first_name',  
]);

`new GetString($key, $default)`

Gets value and casts to string (if possible) or returns $default.

$mapper = new Mapper([
    'name' => new GetString('username', 'anonymous'),
]);

`new GetInteger($key, $default)`

Gets value and casts to integer (if possible) or $default.

$mapper = new Mapper([
    'age' => new GetInteger('user.age', null),
]);

`new GetFloat($key, $default)`

Gets value and casts to float (if possible) or $default.

`new GetBoolean($key, $default)`

Gets value and casts to boolean (true, false, 0, 1, '0', '1') or $default.

`new GetDate($key, $default)`

Gets value and transform to \DateTimeImmutable (if possible) or $default.

`new GetJoinedStrings($glue, $key1, $key2, ...)`

Gets string value for given keys an join it using $glue.

$mapper = new Mapper([
    'fullname' => new GetJoinedStrings(' ', 'user.name', 'user.surname'),
]);

`new GetMappedCollection($key, $callback)`

Gets collection under given $key and maps it with $callback or return [] if entry cannot be mapped.

$characterMapper = new Mapper([
    'fullname' => new GetJoinedStrings(' ', 'name', 'surname'),
] );

$movieMapper = new Mapper([
    'movie' => 'name',
    'characters' => new GetMappedCollection('characters', $characterMapper),
]);

$mapper->map([
    'name' => 'Lucky Luke',
    'characters' => [
        ['name' => 'Lucky', 'surname' => 'Luke'],
        ['name' => 'Joe', 'surname' => 'Dalton'],
        ['name' => 'William', 'surname' => 'Dalton'],
        ['name' => 'Jack', 'surname' => 'Dalton'],
        ['name' => 'Averell', 'surname' => 'Dalton'],
    ],
]);

// result:
[
   'movie' => 'Lucky Luke',
   'characters' => [
       ['fullname' => 'Lucky Luke'],
       ['fullname' => 'Joe Dalton'],
       ['fullname' => 'William Dalton'],
       ['fullname' => 'Jack Dalton'],
       ['fullname' => 'Averell Dalton'],
   ],
];

`new GetMappedFlatCollection($key, $callback)`

Similar to GetMappedCollection but result is flattened.

`new GetTranslated($key, $map, $default)`

Gets value and translates it using provided associative array ($map) or $default when translation for value is not available.

$mapper = new Mapper([
    'agree' => new GetTranslated('agree', ['yes' => true, 'no' => false], false), 
]);

$mapper->map(['agree' => 'yes']) === ['agree' => true];
$mapper->map(['agree' => 'no']) === ['agree' => false];
$mapper->map(['agree' => 'maybe']) === ['agree' => false];

`GetFiltered::from('key')->...`

Gets value and transforms it through filters pipeline.

$mapper = new Mapper([
    'text' => GetFiltered::from('html')->string()->stripTags()->trim()->ifNull('[empty]'),
    'time' => GetFiltered::from('datetime')->dateFormat('H:i:s'),
    'date' => GetFiltered::from('time_string')->date(),
    'amount' => GetFiltered::from('amount_string')->float()->round(2),
    'amount_int' => GetFiltered::from('amount_string')->round()->int()->ifNull(0),
]);

Using function as filter:

$greeting = function (string $name): string {
    return "Hello {$name}!";
};

$mapper = new Mapper([
    'greet' => GetFiltered::from('name')->string()->with($greeting),
]);

$mapper->map(['name' => 'John']); // result: ['greet' => 'Hello John!']

Regular filters will not be called when value becomes null, with exceptions of ifNull, ifEmpty and withNullable.

Custom null handling filter:

$requireInt = function ($value): int {
    if (!is_int($value)) {
        throw new InvalidArgumentException('I require int!');
    }

    return $value;
};

$mapper = new Mapper([
    'must_be_int' => GetFiltered::from('number')->int()->withNullable($requireInt),
]);

$mapper->map(['number' => 'x']); // throws InvalidArgumentException
$mapper->map(['number' => 1]); // returns ['required_int' => 1]

GetFiltered has set of built-in filters similar to FilteredInput.

with(callable $filter): add to pipeline custom filter functions
withNullable(callable $filter): add to pipeline custom filter functions that will be called even when value has become null
string(): try cast to string
int(): try cast to int
float(): try cast to float
bool(): try cast to bool
array(): try cast to array
explode(string $delimiter)
implode(string $glue)
upper()
lower()
trim()
format(string $template): format value with sprintf template
replace(string $search, string $replace)
stripTags()
numberFormat(int $decimals = 0, string $decimalPoint = '.', string $thousandsSeparator = ',')
round(int $precision = 0)
floor()
ceil()
date(): try cast to DateTimeImmutable
dateFormat(string $format)
count()
ifNull($default)
ifEmpty($default)

Input abstraction

Input interface defines common abstraction for accessing data from different data structures, so mapping and getters must not depend of underlying data type.

It also allows to create input decorators for additional input processing, like data filtering, transformation, traversing etc.

`ArrayInput`

Wraps associative arrays and ArrayAccess objects.

$array = ['one' => 1];
$input = new ArrayInput($array);

$input->get('key'); // is translated to: $array['key'] ?? null
$input->get('one'); // 1
$input->get('two'); // null
$input->get('two', 'default'); // 'default'

$input->has('one'); // true
$input->has('two'); // false

`ObjectInput`

Wraps generic object and fetches data using object public interface: public properties or getters (a public method without parameters that returns some value).

Access method for key example name is resolved in the following order:

check for public property name
check for getter name()
check for getter getName()
check for getter isName()

class Example
{
    public $one = 1;
    private $two = 2;
    private $three = 3;
    
    public function two(): int
    {
        return $this->two;
    }
    
    public function getThree(): int
    {
        return $this->three;
    }
}

$object = new Example();
$input = new ObjectInput($object);

$input->get('one'); // 1 (public property $object->one)
$input->get('two'); // 2 (getter $object->())
$input->get('three'); // 3 (getter $object->getThree())
$input->get('four'); // null (no property, no getter)
$input->get('four', 'default'); // 'default'

$input->has('one'); // true
$input->has('four'); // false

`RecursiveInput`

RecursiveInput allows to traverse trees od data using dot notation ($input->get('root.branch.leaf')). It decorates Input (current leaf) and requires Wrapper to wrap with proper Input next visited leafs (which can be arrays or objects).

class Example
{
    public $one = ['nested' => 'nested one'];
    
    public function two(): object
    {
        return (object)['nested' => 'nested two'];
    }
};

$innerInput = new ObjectInput(new Example());
$input = new RecursiveInput($innerInput, MixedWrapper::default());

$input->get('one'); // ['nested' => 'nested one']
$input->get('one.nested'); // 'nested one'
$input->get('one.other'); // null
$input->get('two.nested'); // 'nested two'

$input->has('one'); // true
$input->has('one.nested'); // true
$input->has('one.other'); // false

`FilteredInput`

FilteredInput is another Input decorator that allows to transform data after it is extracted from inner structure.

$innerInput = new ArrayInput([
    'amount' => 123,
    'description' => '  string  ',
    'price' => 123.1234,
]);

$input = new FilteredInput($innerInput, InputFilterParser::default());

$input->get('amount | string'); // '123'
$input->get('description | trim | upper'); // 'STRING'
$input->get('description | integer'); // null
$input->get('price | round'); // 123.0
$input->get('description | round'); // null
$input->get('price | round 2'); // 123.12
$input->get('price | ceil | integer'); // 124

Default input parser supports given filters:

string: cast value to string if possible or return null |
int, integer: cast to integer or return null
float: cast to float or return null
bool, boolean: resolve value as boolean or return null
array: cast value to array if possible (from array or iterable) or return null
explode [delimiter=","]: explode string using delimiter (, by default)
implode [delimiter=","]: implode array of strings using delimiter (, by default)
upper: upper case string
lower: lower case string
trim, ltrim, rtrim: trim string
format: format value as string using sprintf
replace [search] [replace=""]: replace substring in string like str_replace function
strip_tags: same as strip_tags function
number_format [decimals=2] [decimal_point="."] [thousands_separator=","]: same as number_format function
round [precision=0]: same as round function
floor: floor value, returns float|null
ceil: floor value, returns float|null
datetime: try to transform value to DateTimeImmutable or return null
date_format [format="Y-m-d H:i:s"]: try to transform value to datetime and format as string or return null when value cannot be transformed
date_modify [modifier]: try to transform value to DateTimeImmutable and then transform it using modifier $datetime->modify($modifier)
timestamp: try to transform value to datetime and then to timestamp or return null
json_encode: encode value to json or return null
json_decode: decode array from json string or return null when failed
count: return count for array or Countable or null when not countable
if_null [then]: return default value when mapped value is null
if_empty [then]: return default value when mapped value is empty

Examples

default explode by comma: string | explode
explode by custom string: string | explode "-"
default implode by comma: array | implode
implode by custom string: array | implode "-"
format string like sprintf: string | format "string: %s"
format money from float: float | format "price: $%01.2f" - transforms 12.3499 to 'price: $12.35'
cast to string with default value: maybe_string | string | if_null "default"
cast to date and modify: date_string | date_modify "+1 day"
calculate md5 of mapped value: key | string | md5
wrap string after 20 characters: key | string | wordwrap 20
using native function with custom argument position of mapped value key | string | preg_replace "/\s+/" " " $$

Function as transformation

Default configuration of InputFilterParser allows use any PHP function as transformation. By default mapped value is passed as first argument to that function optionally followed by other arguments defined in filter config. It is also possible to define different argument position of mapped value using $$ as a placeholder.

Output formatting

Mapping output type depends on Formatter used by Mapper.

Built-in formatters:

`ArrayFormatter`

Returns associative array which is raw result of Mapper transformation.

$mapper = new Mapper($map);
// same as:
$mapper = new Mapper($map, new ArrayFormatter());

`ObjectConstructor`

Tries to create new instance of object using regular constructor. Keys are matched with constructor parameters by variable name.

There is no value type and correctness checking, so you will get TypeError when mapped types does not match. It also fallback to null value when object constructor has parameter that is not in the mapping.

// by class constructor:
$mapper = new Mapper($map, new ObjectConstructor(SomeClass::class));

// by static method:
$mapper = new Mapper($map, new ObjectConstructor(SomeClass::class, 'method'));

`ObjectHydrator`

Tries to hydrate instance of object using his public interface, that is:

by setting public properties values
by using setters (setSomething or withSomething assuming immutability)

// hydrate instance clone
$mapper = new Mapper($map, new ObjectHydrator(new SomeClass()));

// new instance from class name
$mapper = new Mapper($map, new ObjectHydrator(SomeClass::class));

Customizing and extending

Mapper consists of 3 components:

GetterMap that describes mapping as string => Getter association,
Wrapper that wraps input mixed structure with proper Input implementation,
Formatter that formats raw mapping result (associative array) to array, object, XML, JSON and so on.

$mapper = new Mapper($getterMap);

// which is equivalent of:
$mapper = new Mapper(
    $getterMap, 
    ArrayFormatter::default(), 
    FilteredWrapper::default()
);

Implement `Input` and `Wrapper` to extract data from specific sources

It is possible to define data extracting for some object type explicitly.

interface Attributes
{
    public function getAttribute($key, $default = null);
}

class AttributesInput implements Input
{
    /** @var Attribiutes */
    private $attributes;
  
    public function get(string $key, $default = null)
    {
        return $this->attributes->getAttribute($key, $default);
    }
    // ...    
}

class AttributesWrapper implements Wrapper
{
    public function supportedTypes(): array
    {
        return [Attributes::class]
    }
  
    public function wrap($data): Input
    {
        return new AttributesInput($data);
    }
}

$mapper = new Mapper(
    $getterMap, 
    ArrayFormatter::default(), 
    FilteredWrapper::default()->withWrappers(new AttributesWrapper())
);

Use only `MixedWrapper` for better performance

By default Mapper supports nested structure fetching and value filters, which is nice but has some expense in performance (see BENCHMARK.md). But it is possible to create Mapper only with MixedWrapper when these feature are not needed.

$mapper = new Mapper(
    $getterMap, 
    ArrayFormatter::default(), 
    MixedWrapper::default()
);

Custom filters for `FilteredInput`

Filter functions list can be extended or overwritten with own implementation.

$mapper = new Mapper(
    [
        'slug' => 'title | my_replace "/[\PL]+/u" "-" | trim "-"'
    ], 
    ArrayFormatter::default(), 
    FilteredWrapper::default()->withFilters([
        'my_replace' => new Filter('preg_replace', ['//', '', '$$'])
    ])
);

Custom `Formatter`

Custom formatter can be used to achieve better object construction performance than generic object formatters. It is also possible to create formatters creating different result types like XML, JSON etc.

class Person
{
    /** @var string */
    private $name;

    /** @var string */
    private $surname;

    public function __construct(string $name, string $surname)
    {
        $this->name = $name;
        $this->surname = $surname;
    }
    // ...
}

class PersonFormatter implements Formatter
{
    public function format(array $output): Person
    {
        return new Person($output['name'], $output['surname']);
    }
}

class JsonFormatter implements Formatter
{
    public function format(array $output): string
    {
        return json_encode($output);
    }
}

$map = [
    'name' => 'person.name | string',
    'surname' => 'person.surname | string',
];

$toPerson = new Mapper($map, new PersonFormatter());
$toPerson->map(['person' => ['name' => 'John', 'surname' => 'Doe']]); 
// result: new Person('John', 'Doe');

$toJson = new Mapper($map, new JsonFormatter());
$toJson->map(['person' => ['name' => 'John', 'surname' => 'Doe']]); 
// result: {"name":"John","surname":"Doe"};

Name		Name	Last commit message	Last commit date
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benchmarks		benchmarks
spec		spec
src		src
.gitignore		.gitignore
.travis.yml		.travis.yml
BENCHMARKS.md		BENCHMARKS.md
LICENSE		LICENSE
README.md		README.md
composer.json		composer.json
phpbench.json		phpbench.json
phpspec.yml		phpspec.yml

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Data Mapper

Defining mapper

Examples

Getter function

Predefined Getters

`new GetRaw($key, $default)`

`new GetString($key, $default)`

`new GetInteger($key, $default)`

`new GetFloat($key, $default)`

`new GetBoolean($key, $default)`

`new GetDate($key, $default)`

`new GetJoinedStrings($glue, $key1, $key2, ...)`

`new GetMappedCollection($key, $callback)`

`new GetMappedFlatCollection($key, $callback)`

`new GetTranslated($key, $map, $default)`

`GetFiltered::from('key')->...`

Input abstraction

`ArrayInput`

`ObjectInput`

`RecursiveInput`

`FilteredInput`

Function as transformation

Output formatting

`ArrayFormatter`

`ObjectConstructor`

`ObjectHydrator`

Customizing and extending

Implement `Input` and `Wrapper` to extract data from specific sources

Use only `MixedWrapper` for better performance

Custom filters for `FilteredInput`

Custom `Formatter`

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Data Mapper

Defining mapper

Examples

Getter function

Predefined Getters

new GetRaw($key, $default)

new GetString($key, $default)

new GetInteger($key, $default)

new GetFloat($key, $default)

new GetBoolean($key, $default)

new GetDate($key, $default)

new GetJoinedStrings($glue, $key1, $key2, ...)

new GetMappedCollection($key, $callback)

new GetMappedFlatCollection($key, $callback)

new GetTranslated($key, $map, $default)

GetFiltered::from('key')->...

Input abstraction

ArrayInput

ObjectInput

RecursiveInput

FilteredInput

Function as transformation

Output formatting

ArrayFormatter

ObjectConstructor

ObjectHydrator

Customizing and extending

Implement Input and Wrapper to extract data from specific sources

Use only MixedWrapper for better performance

Custom filters for FilteredInput

Custom Formatter

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`new GetRaw($key, $default)`

`new GetString($key, $default)`

`new GetInteger($key, $default)`

`new GetFloat($key, $default)`

`new GetBoolean($key, $default)`

`new GetDate($key, $default)`

`new GetJoinedStrings($glue, $key1, $key2, ...)`

`new GetMappedCollection($key, $callback)`

`new GetMappedFlatCollection($key, $callback)`

`new GetTranslated($key, $map, $default)`

`GetFiltered::from('key')->...`

`ArrayInput`

`ObjectInput`

`RecursiveInput`

`FilteredInput`

`ArrayFormatter`

`ObjectConstructor`

`ObjectHydrator`

Implement `Input` and `Wrapper` to extract data from specific sources

Use only `MixedWrapper` for better performance

Custom filters for `FilteredInput`

Custom `Formatter`

Packages