ygdc/kirby/config/fields/text.php

<?php

use Kirby\Exception\InvalidArgumentException;
use Kirby\Toolkit\Str;

return [
	'props' => [

		/**
		 * The field value will be converted with the selected converter before the value gets saved. Available converters: `lower`, `upper`, `ucfirst`, `slug`
		 */
		'converter' => function ($value = null) {
			if ($value !== null && array_key_exists($value, $this->converters()) === false) {
				throw new InvalidArgumentException([
					'key'  => 'field.converter.invalid',
					'data' => ['converter' => $value]
				]);
			}

			return $value;
		},

		/**
		 * Shows or hides the character counter in the top right corner
		 */
		'counter' => function (bool $counter = true) {
			return $counter;
		},

		/**
		 * Sets the font family (sans or monospace)
		 */
		'font' => function (string $font = null) {
			return $font === 'monospace' ? 'monospace' : 'sans-serif';
		},

		/**
		 * Maximum number of allowed characters
		 */
		'maxlength' => function (int $maxlength = null) {
			return $maxlength;
		},

		/**
		 * Minimum number of required characters
		 */
		'minlength' => function (int $minlength = null) {
			return $minlength;
		},

		/**
		 * A regular expression, which will be used to validate the input
		 */
		'pattern' => function (string $pattern = null) {
			return $pattern;
		},

		/**
		 * If `false`, spellcheck will be switched off
		 */
		'spellcheck' => function (bool $spellcheck = false) {
			return $spellcheck;
		},
	],
	'computed' => [
		'default' => function () {
			return $this->convert($this->default);
		},
		'value' => function () {
			return (string)$this->convert($this->value);
		}
	],
	'methods' => [
		'convert' => function ($value) {
			if ($this->converter() === null) {
				return $value;
			}

			$converter = $this->converters()[$this->converter()];

			if (is_array($value) === true) {
				return array_map($converter, $value);
			}

			return call_user_func($converter, trim($value ?? ''));
		},
		'converters' => function (): array {
			return [
				'lower' => function ($value) {
					return Str::lower($value);
				},
				'slug' => function ($value) {
					return Str::slug($value);
				},
				'ucfirst' => function ($value) {
					return Str::ucfirst($value);
				},
				'upper' => function ($value) {
					return Str::upper($value);
				},
			];
		},
	],
	'validations' => [
		'minlength',
		'maxlength',
		'pattern'
	]
];