# Formatters <!-- omit in toc -->

## Table of Contents <!-- omit in toc -->

-   [How to use them](#how-to-use-them)
-   [MoneyFormatter](#moneyformatter)
    -   [Arguments](#arguments)
    -   [Example use and returned value](#example-use-and-returned-value)
-   [CurrencyFormatter](#currencyformatter)
    -   [Arguments](#arguments-1)
    -   [Example use and returned value](#example-use-and-returned-value-1)
-   [HtmlFormatter](#htmlformatter)
    -   [Arguments](#arguments-2)
    -   [Example use and returned value](#example-use-and-returned-value-2)

`Formatters` are utility classes that allow you to format values to so that they are compatible with the StoreAPI, values such as money, currency, or HTML.

## How to use them

To get a formatter, you can use the `get_formatter` method of the `ExtendSchema` class. This method accepts a string, which is the name of the formatter you want to use, e.g. (money, html, currency).

```php
get_formatter('money'); // For the MoneyFormatter
get_formatter('html'); // For the HtmlFormatter
get_formatter('currency'); // CurrencyFormatter
```

This returns a `FormatterInterface` which has the `format` method.

The `format` method signature is:

```php
format( $value, array $options = [] );
```

Only `MoneyFormatter`'s behaviour can be controlled by the `$options` parameter.

## MoneyFormatter

The [`MoneyFormatter`](https://github.com/woocommerce/woocommerce-gutenberg-products-block/blob/trunk/src/StoreApi/Formatters/MoneyFormatter.php) class can be used to format a monetary value using the store settings. The store settings may be overriden by passing options to this formatter's `format` method.

### Arguments

| Argument                    | Type     | Description                                                                                                                                                                                                                      |
| --------------------------- | -------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `$value`                    | `number` | The number you want to format into a monetary value                                                                                                                                                                              |
| `$options`                  | `array`  | Should contain two keys, `decimals` which should be an `integer`,                                                                                                                                                                |
| `$options['decimals']`      | `number` | Used to control how many decimal places should be displayed in the monetary value. Defaults to the store setting.                                                                                                                |
| `$options['rounding_mode']` | `number` | Used to determine how to round the monetary value. This should be one of the PHP rounding modes described in the [PHP round() documentation](https://www.php.net/manual/en/function.round.php). Defaults to `PHP_ROUND_HALF_UP`. |

### Example use and returned value

```php
get_formatter( 'money' )->format( 10.443, [
  'rounding_mode' => PHP_ROUND_HALF_DOWN,
  'decimals'      => 2
] );
```

returns `1044`

## CurrencyFormatter

This formatter takes an array of prices, and returns the same array but with currency data added. The currency data added is:

| Key                           | Type     | Description                                                                                       |
| ----------------------------- | -------- | ------------------------------------------------------------------------------------------------- |
| `currency_code`               | `string` | The string representation of the currency, e.g. GPB or USD                                        |
| `currency_symbol`             | `string` | The symbol of the currency, e.g. &pound; or \$                                                    |
| `currency_minor_unit`         | `number` | How many decimal places will be shown in the currency                                             |
| `currency_decimal_separator`  | `string` | The string used to separate the whole value and the decimal value in the currency.                |
| `currency_thousand_separator` | `string` | The string used to separate thousands in the currency, for example: &pound;10,000 or &euro;10.000 |
| `currency_prefix`             | `string` | A string that should appear before the currency value.                                            |
| `currency_suffix`             | `string` | A string that should appear after the currency value.                                             |

### Arguments

| Argument | Type       | Description                                                                  |
| -------- | ---------- | ---------------------------------------------------------------------------- |
| `$value` | `number[]` | An array of prices that you want to merge with the store's currency settings |

### Example use and returned value

```php
get_formatter( 'currency' )->format( [
  'price'         => 1800,
  'regular_price' => 1800,
  'sale_price'    => 1800,
] );
```

returns

```text
'price' => '1800'
'regular_price' => '1800'
'sale_price' => '1800'
'price_range' => null
'currency_code' => 'GBP'
'currency_symbol' => '£'
'currency_minor_unit' => 2
'currency_decimal_separator' => '.'
'currency_thousand_separator' => ','
'currency_prefix' => '£'
'currency_suffix' => ''
```

## HtmlFormatter

This formatter will take an HTML value, run it through: [`wptexturize`](https://developer.wordpress.org/reference/functions/wptexturize/),
[`convert_chars`](https://developer.wordpress.org/reference/functions/convert_chars/),
[`trim`](https://www.php.net/manual/en/function.trim.php), and [`wp_kses_post`](https://developer.wordpress.org/reference/functions/wp_kses_post/)
before returning it. The purpose of this formatter is to make HTML "safe" (in terms of correctly formatted characters).
`wp_kses_post` will ensure only HTML tags allowed in the context of a `post` are present in the string.

### Arguments

| Argument | Type     | Description                                     |
| -------- | -------- | ----------------------------------------------- |
| `$value` | `string` | The string you want to format into "safe" HTML. |

### Example use and returned value

```php
get_formatter( 'html' )->format(
  "<script>alert('bad script!')</script> This \"coffee\" is <strong>very strong</strong>."
);
```

returns

```text
alert('bad script!') This &#8220;coffee&#8221; is <strong>very strong</strong>.
```

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