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Current File : /home/utripoli/www/alqalam/lib/pkp/classes/components/forms/Field.php
<?php
/**
 * @file classes/components/form/Field.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @class Field
 *
 * @ingroup classes_controllers_form
 *
 * @brief A base class representing a single field in a form.
 */

namespace PKP\components\forms;

abstract class Field
{
    /** @var string Which UI Library component this field represents */
    public $component;

    /** @var string The form input name for this field */
    public $name;

    /** @var string|object Field label or multilingual object matching locales to labels, eg  ['en' => 'Label', 'fr_CA' => 'Étiquette'] */
    public $label = '';

    /** @var string Field description */
    public $description;

    /** @var string Field tooltip */
    public $tooltip;

    /** @var string Field help topic. Refers to the /dev/docs file name without .md */
    public $helpTopic;

    /** @var string Field help section. An optional anchor link to open to when loading the helpTopic. */
    public $helpSection;

    /** @var string Which group should this field be placed in? */
    public $groupId;

    /** @var bool Is this field required? */
    public $isRequired = false;

    /** @var bool Is this field multilingual? */
    public $isMultilingual = false;

    /** @var mixed The value of this field. If multilingual, expects a key/value array: ['en', => 'English value', 'fr_CA' => 'French value'] */
    public $value;

    /** @var mixed A default for this field when no value is specified. */
    public $default;

    /**
     * Only show this field when the field named here is not empty. Match an exact
     * value by passing an array:
     *
     * $this->showWhen = ['fieldName', 'expectedValue'];
     *
     * @var string|array
     */
    public $showWhen;

    /** @var array List of required properties for this field. */
    private $_requiredProperties = ['name', 'component'];

    /**
     * Initialize the form field
     *
     * @param string $name
     * @param array $args [
     *
     *  @option label string|object
     *  @option groupId string
     *  @option isRequired boolean
     *  @option isMultilingual boolean
     * ]
     */
    public function __construct($name, $args = [])
    {
        $this->name = $name;
        foreach ($args as $key => $value) {
            if (property_exists($this, $key)) {
                $this->{$key} = $value;
            }
        }
    }

    /**
     * Get a configuration object representing this field to be passed to the UI
     * Library
     *
     * @return array
     */
    public function getConfig()
    {
        if (!$this->validate()) {
            throw new \Exception('Form field configuration did not pass validation: ' . print_r($this, true));
        }
        $config = [
            'name' => $this->name,
            'component' => $this->component,
            'label' => $this->label,
        ];
        if (isset($this->description)) {
            $config['description'] = $this->description;
        }
        if (isset($this->tooltip)) {
            $config['tooltip'] = $this->tooltip;
        }
        if (isset($this->helpTopic)) {
            $config['helpTopic'] = $this->helpTopic;
            if ($this->helpSection) {
                $config['helpSection'] = $this->helpSection;
            }
        }
        if (isset($this->groupId)) {
            $config['groupId'] = $this->groupId;
        }
        if (isset($this->isRequired)) {
            $config['isRequired'] = $this->isRequired;
        }
        if (isset($this->isMultilingual)) {
            $config['isMultilingual'] = $this->isMultilingual;
        }
        if (isset($this->showWhen)) {
            $config['showWhen'] = $this->showWhen;
        }

        $config['value'] = $this->value ?? $this->default ?? null;

        return $config;
    }

    /**
     * Validate the field configuration
     *
     * Check that no required fields are missing
     *
     * @return bool
     */
    public function validate()
    {
        foreach ($this->_requiredProperties as $property) {
            if (!isset($this->{$property})) {
                return false;
            }
        }
        return true;
    }

    /**
     * Get a default empty value for this field type
     *
     * The UI Library expects to receive a value property for each field. If it's
     * a multilingual field, it expects the value property to contain keys for
     * each locale in the form.
     *
     * This function will provide a default empty value so that a form can fill
     * in the empty values automatically.
     *
     */
    public function getEmptyValue()
    {
        return '';
    }
}

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