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json-normalizer

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📃 Provides a composer package with generic and vendor-specific normalizers for normalizing JSON documents.

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# json-normalizer

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This project provides a [`composer`](https://getcomposer.org) package with generic and vendor-specific normalizers for normalizing [JSON documents](https://www.json.org).

## Installation

Run

```sh
composer require ergebnis/json-normalizer
```

## Usage

This project comes with

- [generic normalizers](#generic-normalizers)
- [vendor-specific normalizers](#vendor-specific-normalizers)

### Generic normalizers

This project comes with the following generic normalizers:

- [`Ergebnis\Json\Normalizer\CallableNormalizer`](#callablenormalizer)
- [`Ergebnis\Json\Normalizer\ChainNormalizer`](#chainnormalizer)
- [`Ergebnis\Json\Normalizer\FormatNormalizer`](#formatnormalizer)
- [`Ergebnis\Json\Normalizer\IndentNormalizer`](#indentnormalizer)
- [`Ergebnis\Json\Normalizer\JsonEncodeNormalizer`](#jsonencodenormalizer)
- [`Ergebnis\Json\Normalizer\SchemaNormalizer`](#schemanormalizer)
- [`Ergebnis\Json\Normalizer\WithFinalNewLineNormalizer`](#withfinalnewlinenormalizer)
- [`Ergebnis\Json\Normalizer\WithoutFinalNewLineNormalizer`](#withoutfinalnewlinenormalizer)

:bulb: All of these normalizers implement the `Ergebnis\Json\Normalizer\Normalizer`.

#### `CallableNormalizer`

When you want to normalize a JSON file with a `callable`, you can use the `CallableNormalizer`.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Json;
use Ergebnis\Json\Normalizer;

$encoded = <<<'JSON'
{
    "name": "Andreas Möller",
    "url": "https://localheinz.com"
}
JSON;

$json = Json::fromString($encoded);

$callable = function (Json $json): Json {
    $decoded = $json->decoded();

foreach (get_object_vars($decoded) as $name => $value) {
        if ('https://localheinz.com' !== $value) {
            continue;
        }

$decoded->{$name} .= '/open-source/';
    }

return Json::fromString(json_encode($decoded));
};

$normalizer = new Normalizer\CallableNormalizer($callable);

$normalized = $normalizer->normalize($json);
```

The normalized version will now have the callable applied to it.

#### `ChainNormalizer`

When you want to apply multiple normalizers in a chain, you can use the `ChainNormalizer`.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Json;
use Ergebnis\Json\Normalizer;
use Ergebnis\Json\Printer;

$encoded = <<<'JSON'
{
    "name": "Andreas Möller",
    "url": "https://localheinz.com"
}
JSON;

$json = Json::fromString($encoded);

$indent = Normalizer\Format\Indent::fromString('  ');
$jsonEncodeOptions = Normalizer\Format\JsonEncodeOptions::fromInt(JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);

$normalizer = new Normalizer\ChainNormalizer(
    new Normalizer\JsonEncodeNormalizer($jsonEncodeOptions),
    new Normalizer\IndentNormalizer(
        $indent,
        new Printer\Printer()
    ),
    new Normalizer\WithFinalNewLineNormalizer()
);

$normalized = $normalizer->normalize($json);
```

The normalized version will now contain the result of applying all normalizers in a chain, one after another.

:bulb: Be careful with the order of the normalizers, as one normalizer might override changes a previous normalizer applied.

#### `FormatNormalizer`

When you want to normalize a JSON file with a formatting, you can use the `FormatNormalizer`.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Json;
use Ergebnis\Json\Normalizer;
use Ergebnis\Json\Printer;

$encoded = <<<'JSON'
{
    "name": "Andreas Möller",
    "emoji": "🤓",
    "url": "https://localheinz.com"
}
JSON;

$json = Json::fromString($encoded);

$format = Normalizer\Format\Format::create(
    Normalizer\Format\Indent::fromString('  '),
    Normalizer\Format\JsonEncodeOptions::fromInt(JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES),
    Normalizer\Format\NewLine::fromString("\r\n")
    true
);

$normalizer = new Normalizer\FormatNormalizer(
    new Printer\Printer(),
    $format,
);

$normalized = $normalizer->normalize($json);
```

The normalized version will now have formatting applied according to `$format`.

#### `IndentNormalizer`

When you need to adjust the indentation of a JSON file, you can use the `IndentNormalizer`.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Json;
use Ergebnis\Json\Normalizer;
use Ergebnis\Json\Printer;

$encoded = <<<'JSON'
{
    "name": "Andreas Möller",
    "url": "https://localheinz.com"
}
JSON;

$json = Json::fromString($encoded);

$indent = Normalizer\Format\Indent::fromString('  ');

$normalizer = new Normalizer\IndentNormalizer(
    $indent,
    new Printer\Printer()
);

$normalized = $normalizer->normalize($json);
```

The normalized version will now be indented with 2 spaces.

#### `JsonEncodeNormalizer`

When you need to adjust the encoding of a JSON file, you can use the `JsonEncodeNormalizer`.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Json;
use Ergebnis\Json\Normalizer;

$encoded = <<<'JSON'
{
    "name": "Andreas M\u00f6ller",
    "url": "https:\/\/localheinz.com"
}
JSON;

$json = Json::fromString($encoded);

$jsonEncodeOptions = Normalizer\Format\JsonEncodeOptions::fromInt(JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE);

$normalizer = new Normalizer\JsonEncodeNormalizer($jsonEncodeOptions);

$normalized = $normalizer->normalize($json);
```

The normalized version will now be encoded with `$jsonEncodeOptions`.

:bulb: For reference, see [`json_encode()`](http://php.net/manual/en/function.json-encode.php) and the corresponding [JSON constants](http://php.net/manual/en/json.constants.php).

#### `SchemaNormalizer`

When you want to rebuild a JSON file according to a JSON schema, you can use the `SchemaNormalizer`.

Let's assume the following schema

```json
{
    "type": "object",
    "additionalProperties": true,
    "properties": {
        "name" : {
            "type" : "string"
        },
        "role" : {
            "type" : "string"
        }
    }
}
```

exists at `/schema/example.json`.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Normalizer;
use Ergebnis\Json\Pointer;
use Ergebnis\Json\SchemaValidator;
use JsonSchema\SchemaStorage;

$encoded = <<<'JSON'
{
    "url": "https://localheinz.com",
    "name": "Andreas Möller",
    "open-source-projects": {
        "ergebnis/data-provider": {
            "downloads": {
                "total": 2,
                "monthly": 1
            }
        },
        "ergebnis/composer-normalize": {
            "downloads": {
                "total": 5,
                "monthly": 2
            }
        }
    }
}
JSON;

$json = Json::fromString($encoded);

$normalizer = new Normalizer\SchemaNormalizer(
    'file:///schema/example.json',
    new SchemaStorage(),
    new SchemaValidator\SchemaValidator(),
    Pointer\Specification::never()
);

$normalized = $normalizer->normalize($json);
```

The normalized version will now be structured according to the JSON schema (in this simple case, properties will be reordered as found in the schema and additional properties will be ordered by name). Internally, the `SchemaNormalizer` uses [`justinrainbow/json-schema`](https://github.com/justinrainbow/json-schema) to resolve schemas, as well as to ensure (before and after normalization) that the JSON document is valid.

If you have properties that you do not want to be reordered, you can use a `Pointer\Specification` to specify which properties should not be reordered.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Normalizer;
use Ergebnis\Json\Pointer;
use Ergebnis\Json\SchemaValidator;
use JsonSchema\SchemaStorage;

$encoded = <<<'JSON'
{
    "url": "https://localheinz.com",
    "name": "Andreas Möller",
    "open-source-projects": {
        "ergebnis/data-provider": {
            "downloads": {
                "total": 2,
                "monthly": 1
            }
        },
        "ergebnis/composer-normalize": {
            "downloads": {
                "total": 5,
                "monthly": 2
            }
        }
    }
}
JSON;

$json = Json::fromString($encoded);

$normalizer = new Normalizer\SchemaNormalizer(
    'file:///schema/example.json',
    new SchemaStorage(),
    new SchemaValidator\SchemaValidator(),
    Pointer\Specification::equals(Pointer\JsonPointer::fromJsonString('/open-source-projects'))
);

$normalized = $normalizer->normalize($json);
```

:bulb: For more information about JSON schema, visit [json-schema.org](http://json-schema.org).

#### `WithFinalNewLineNormalizer`

When you want to ensure that a JSON file has a single final new line, you can use the `WithFinalNewLineNormalizer`.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Normalizer;

$encoded = <<<'JSON'
{
    "name": "Andreas Möller",
    "url": "https://localheinz.com"
}

JSON;

$json = Json::fromString($encoded);

$normalizer = new Normalizer\WithFinalNewLineNormalizer();

$normalized = $normalizer->normalize($json);
```

The normalized version will now have a single final new line.

#### `WithoutFinalNewLineNormalizer`

When you want to ensure that a JSON file does not have a final new line, you can use the `WithoutFinalNewLineNormalizer`.

```php
<?php

declare(strict_types=1);

use Ergebnis\Json\Normalizer;

$encoded = <<<'JSON'
{
    "name": "Andreas Möller",
    "url": "https://localheinz.com"
}

JSON;

$json = Json::fromString($encoded);

$normalizer = new Normalizer\WithoutFinalNewLineNormalizer();

$normalized = $normalizer->normalize($json);
```

The normalized version will now not have a final new line or any whitespace at the end.

### Vendor-specific normalizers

This project comes with the following vendor-specific normalizers:

- [`Ergebnis\Json\Normalizer\Vendor\Composer\JsonNormalizer`](#vendorcomposercomposerjsonnormalizer)

#### `Vendor\Composer\ComposerJsonNormalizer`

The `Vendor\Composer\ComposerJsonNormalizer` can be used to normalize a `composer.json` file according to its underlying JSON schema.

It composes the following normalizers:

- [`Ergebnis\Composer\Json\Normalizer\Vendor\Composer\BinNormalizer`](#vendorcomposerbinnormalizer)
- [`Ergebnis\Composer\Json\Normalizer\Vendor\Composer\ConfigHashNormalizer`](#vendorcomposerconfighashnormalizer)
- [`Ergebnis\Composer\Json\Normalizer\Vendor\Composer\PackageHashNormalizer`](#vendorcomposerpackagehashnormalizer)
- [`Ergebnis\Composer\Json\Normalizer\Vendor\Composer\RepositoriesHashNormalizer`](#vendorcomposerrepositorieshashnormalizer)
- [`Ergebnis\Composer\Json\Normalizer\Vendor\Composer\VersionConstraintNormalizer`](#vendorcomposerversionconstraintnormalizer)
- [`Ergebnis\Composer\Json\Normalizer\Vendor\WithFinalNewLineNormalizer`](#withfinalnewlinenormalizer)

#### `Vendor\Composer\BinNormalizer`

When `composer.json` contains an array of scripts in the [`bin`](https://getcomposer.org/doc/04-schema.md#bin) section, the `Vendor\Composer\BinNormalizer` will sort the elements of the `bin` section by value in ascending order.

#### `Vendor\Composer\ConfigHashNormalizer`

When `composer.json` contains configuration in the [`config`](https://getcomposer.org/doc/06-config.md#config) section, the `Vendor\Composer\ConfigHashNormalizer` will sort the content of these sections by key in ascending order.

The [`allow-plugins`](https://getcomposer.org/doc/06-config.md#allow-plugins) and [`preferred-install`](https://getcomposer.org/doc/06-config.md#preferred-install) configuration options support keys with wildcards and require special handling.

When these keys do not use wildcards, then these keys are sorted in ascending order. When these keys use wildcards, these keys are sorted when the wildcards are at the end of package names. Due to internal implementation details of the wildcard feature within `composer`, sorting keys with wildcards in the middle is not feasible.

#### `Vendor\Composer\PackageHashNormalizer`

When `composer.json` contains any configuration in the

- [`conflict`](https://getcomposer.org/doc/04-schema.md#conflict)
- [`provide`](https://getcomposer.org/doc/04-schema.md#provide)
- [`replace`](https://getcomposer.org/doc/04-schema.md#replace)
- [`require`](https://getcomposer.org/doc/04-schema.md#require)
- [`require-dev`](https://getcomposer.org/doc/04-schema.md#require-dev)
- [`suggest`](https://getcomposer.org/doc/04-schema.md#suggest)

sections, the `Vendor\Composer\PackageHashNormalizer` will sort the packages in these sections.

:bulb: This transfers the behaviour from using the [`--sort-packages`](https://getcomposer.org/doc/03-cli.md#require) or [`sort-packages`](https://getcomposer.org/doc/06-config.md#sort-packages) configuration flag in `require` and `require-dev` to other sections.

#### `Vendor\Composer\RepositoriesHashNormalizer`

When `composer.json` contains any configuration in the

- [`repositories`](https://getcomposer.org/doc/04-schema.md#repositories)

section, the `Vendor\Composer\RepositoriesHashNormalizer` will sort the repositories listed in the [`exclude` and `only` properties of repositories](https://getcomposer.org/doc/articles/repository-priorities.md#filtering-packages).

#### `Vendor\Composer\VersionConstraintNormalizer`

When `composer.json` contains version constraints in the

- [`conflict`](https://getcomposer.org/doc/04-schema.md#conflict)
- [`provide`](https://getcomposer.org/doc/04-schema.md#provide)
- [`replace`](https://getcomposer.org/doc/04-schema.md#replace)
- [`require`](https://getcomposer.org/doc/04-schema.md#require)
- [`require-dev`](https://getcomposer.org/doc/04-schema.md#require-dev)

sections, the `Vendor\Composer\VersionConstraintNormalizer` will ensure that

- all version constraints are trimmed

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#version-range",
     "require": {
  -    "php": " ^8.2 "
  +    "php": "^8.2"
   }
  ```

- version constraints separated by a space (` `) or comma (`,`) - treated as a logical and - are separated by a space (` `) instead

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#version-range",
     "require": {
  -    "foo/bar": "1.2.3,2.3.4",
  -    "foo/baz": "2.3.4   3.4.5"
  +    "foo/bar": "1.2.3 2.3.4",
  +    "foo/baz": "2.3.4 3.4.5"
   }
  ```

- version constraints separated by a single- (`|`) or double-pipe (`||`) and any number of spaces before and after - treated as a logical or - are separated by a double pipe with a single space before and after (` || `)

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#version-range",
     "require": {
  -    "php": "^8.1|^8.2",
  -    "foo/bar": "^1.2.3  ||  ^2.3.4"
  +    "php": "^8.1 || ^8.2",
  +    "foo/bar": "^1.2.3 || ^2.3.4"
   }
  ```

- [hyphenated version ranges](https://getcomposer.org/doc/articles/versions.md#hyphenated-version-range-) separated by dash (` - `) and any positive number of spaces before and after are separated by a dash with a single space before and after (` - `)

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#hyphenated-version-range-",
     "require": {
  -    "foo/bar": "1.2.3  -  2.3.4"
  +    "foo/bar": "1.2.3 - 2.3.4"
   }
  ```

- duplicate constraints are removed

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#version-range",
     "require": {
  -    "foo/bar": "^1.0 || ^1.0 || ^2.0"
  +    "foo/bar": "^1.0 || ^2.0"
   }
  ```

- overlapping constraints are removed

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#version-range",
     "require": {
  -    "foo/bar": "^1.0 || ^1.1 || ^2.0 || ~2.1.0 || 2.4.5"
  +    "foo/bar": "^1.0 || ^2.0"
   }
  ```

- [tilde version ranges (`~`)](https://getcomposer.org/doc/articles/versions.md#tilde-version-range-) are preferred over [wildcard (`*`) version ranges](https://getcomposer.org/doc/articles/versions.md#wildcard-version-range-)

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#version-range",
     "require": {
       "foo/bar": "*",
  -    "foo/baz": "1.0.*"
  +    "foo/baz": "~1.0.0"
   }
  ```

- [caret version ranges (`^`)](https://getcomposer.org/doc/articles/versions.md#caret-version-range-) are preferred over [tilde version ranges (`~`)](https://getcomposer.org/doc/articles/versions.md#tilde-version-range-)

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#version-range",
     "require": {
  -    "foo/bar": "~1",
  -    "foo/baz": "~1.3"
  +    "foo/bar": "^1.0",
  +    "foo/baz": "^1.3"
   }
  ```

- version numbers are sorted in ascending order

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/versions.md#version-range",
     "require": {
  -    "foo/bar": "^2.0 || ^1.4"
  +    "foo/bar": "^1.4 || ^2.0"
   }
  ```

- extra spaces in [inline aliases](https://getcomposer.org/doc/articles/aliases.md#require-inline-alias) are removed

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/aliases.md#require-inline-alias",
     "require": {
  -    "foo/bar": "dev-2.x  as  2.0"
  +    "foo/bar": "dev-2.x as 2.0"
   }
  ```

- useless [inline aliases](https://getcomposer.org/doc/articles/aliases.md#require-inline-alias) are removed

```diff
   {
     "homepage": "https://getcomposer.org/doc/articles/aliases.md#require-inline-alias",
     "require": {
  -    "foo/bar": "2.0 as 2.0"
  +    "foo/bar": "2.0"
   }
  ```

- leading `v` prefixes in version constraints are removed

```diff
   {
     "require": {
  -    "foo/bar": "^v1.2",
  -    "foo/baz": "v1.3.7"
  +    "foo/bar": "^1.2",
  +    "foo/baz": "1.3.7"
   }
  ```

- use of `x` or `X` for wildcards is replaced with `*`

```diff
   {
     "require": {
  -    "foo/bar": "1.x",
  -    "foo/baz": "2.3.X",
  -    "foo/qux": "x"
  +    "foo/bar": "^1.0",
  +    "foo/baz": "~2.3.0",
  +    "foo/qux": "*"
   }
  ```

- empty sections (which are defined as optional in the schema) are automatically removed

```diff
   {
      "require": {
          "foo/bar": "^2.3.4"
      }
  -   "config": {
  -       "preferred-install": {}
  -   }
   }
  ```

## Changelog

The maintainers of this project record notable changes to this project in a [changelog](CHANGELOG.md).

## Contributing

The maintainers of this project suggest following the [contribution guide](.github/CONTRIBUTING.md).

## Code of Conduct

The maintainers of this project ask contributors to follow the [code of conduct](https://github.com/ergebnis/.github/blob/main/CODE_OF_CONDUCT.md).

## General Support Policy

The maintainers of this project provide limited support.

You can support the maintenance of this project by [sponsoring @ergebnis](https://github.com/sponsors/ergebnis).

## PHP Version Support Policy

This project supports PHP versions with [active and security support](https://www.php.net/supported-versions.php).

The maintainers of this project add support for a PHP version following its initial release and drop support for a PHP version when it has reached the end of security support.

## Security Policy

This project has a [security policy](.github/SECURITY.md).

## License

This project uses the [MIT license](LICENSE.md).

## Credits

The algorithm for sorting packages in the [`Vendor\Composer\PackageHashNormalizer`](src/Vendor/Composer/PackageHashNormalizer.php) has been adopted from [`Composer\Json\JsonManipulator::sortPackages()`](https://github.com/composer/composer/blob/1.6.2/src/Composer/Json/JsonManipulator.php#L110-L146) (originally licensed under MIT by [Nils Adermann](https://github.com/naderman) and [Jordi Boggiano](https://github.com/seldaek)), which I initially contributed to `composer/composer` with [`composer/composer#3549`](https://github.com/composer/composer/pull/3549) and [`composer/composer#3872`](https://github.com/composer/composer/pull/3872).

## Social

Follow [@localheinz](https://twitter.com/intent/follow?screen_name=localheinz) and [@ergebnis](https://twitter.com/intent/follow?screen_name=ergebnis) on Twitter.

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