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<?php
/**
* Data-aware form generator.
*/
class scbForms {
const TOKEN = '%input%';
/**
* Generates form field.
*
* @param array|scbFormField_I $args
* @param mixed $value
*
* @return string
*/
public static function input_with_value( $args, $value ) {
$field = scbFormField::create( $args );
return $field->render( $value );
}
/**
* Generates form field.
*
* @param array|scbFormField_I $args
* @param array $formdata (optional)
*
* @return string
*/
public static function input( $args, $formdata = null ) {
$field = scbFormField::create( $args );
return $field->render( scbForms::get_value( $args['name'], $formdata ) );
}
/**
* Generates a table wrapped in a form.
*
* @param array $rows
* @param array $formdata (optional)
*
* @return string
*/
public static function form_table( $rows, $formdata = null ) {
$output = '';
foreach ( $rows as $row ) {
$output .= self::table_row( $row, $formdata );
}
$output = self::form_table_wrap( $output );
return $output;
}
/**
* Generates a form.
*
* @param array $inputs
* @param array $formdata (optional)
* @param string $nonce
*
* @return string
*/
public static function form( $inputs, $formdata = null, $nonce ) {
$output = '';
foreach ( $inputs as $input ) {
$output .= self::input( $input, $formdata );
}
$output = self::form_wrap( $output, $nonce );
return $output;
}
/**
* Generates a table.
*
* @param array $rows
* @param array $formdata (optional)
*
* @return string
*/
public static function table( $rows, $formdata = null ) {
$output = '';
foreach ( $rows as $row ) {
$output .= self::table_row( $row, $formdata );
}
$output = self::table_wrap( $output );
return $output;
}
/**
* Generates a table row.
*
* @param array $args
* @param array $formdata (optional)
*
* @return string
*/
public static function table_row( $args, $formdata = null ) {
return self::row_wrap( $args['title'], self::input( $args, $formdata ) );
}
// ____________WRAPPERS____________
/**
* Wraps a table in a form.
*
* @param string $content
* @param string $nonce (optional)
*
* @return string
*/
public static function form_table_wrap( $content, $nonce = 'update_options' ) {
return self::form_wrap( self::table_wrap( $content ), $nonce );
}
/**
* Wraps a content in a form.
*
* @param string $content
* @param string $nonce (optional)
*
* @return string
*/
public static function form_wrap( $content, $nonce = 'update_options' ) {
return html( "form method='post' action=''",
$content,
wp_nonce_field( $nonce, '_wpnonce', $referer = true, $echo = false )
);
}
/**
* Wraps a content in a table.
*
* @param string $content
*
* @return string
*/
public static function table_wrap( $content ) {
return html( "table class='form-table'", $content );
}
/**
* Wraps a content in a table row.
*
* @param string $title
* @param string $content
*
* @return string
*/
public static function row_wrap( $title, $content ) {
return html( 'tr',
html( "th scope='row'", $title ),
html( 'td', $content )
);
}
// ____________PRIVATE METHODS____________
// Utilities
/**
* Generates the proper string for a name attribute.
*
* @param array|string $name The raw name
*
* @return string
*/
public static function get_name( $name ) {
$name = (array) $name;
$name_str = array_shift( $name );
foreach ( $name as $key ) {
$name_str .= '[' . esc_attr( $key ) . ']';
}
return $name_str;
}
/**
* Traverses the formdata and retrieves the correct value.
*
* @param string $name The name of the value
* @param array $value The data that will be traversed
* @param mixed $fallback (optional) The value returned when the key is not found
*
* @return mixed
*/
public static function get_value( $name, $value, $fallback = null ) {
foreach ( (array) $name as $key ) {
if ( ! isset( $value[ $key ] ) ) {
return $fallback;
}
$value = $value[ $key ];
}
return $value;
}
/**
* Given a list of fields, validate some data.
*
* @param array $fields List of args that would be sent to scbForms::input()
* @param array $data (optional) The data to validate. Defaults to $_POST
* @param array $to_update (optional) Existing data to populate. Necessary for nested values
*
* @return array
*/
public static function validate_post_data( $fields, $data = null, $to_update = array() ) {
if ( null === $data ) {
$data = stripslashes_deep( $_POST );
}
foreach ( $fields as $field ) {
$value = scbForms::get_value( $field['name'], $data );
$fieldObj = scbFormField::create( $field );
$value = $fieldObj->validate( $value );
if ( null !== $value ) {
self::set_value( $to_update, $field['name'], $value );
}
}
return $to_update;
}
/**
* For multiple-choice fields, we can never distinguish between "never been set" and "set to none".
* For single-choice fields, we can't distinguish either, because of how self::update_meta() works.
* Therefore, the 'default' parameter is always ignored.
*
* @param array $args Field arguments.
* @param int $object_id The object ID the metadata is attached to
* @param string $meta_type (optional)
*
* @return string
*/
public static function input_from_meta( $args, $object_id, $meta_type = 'post' ) {
$single = ( 'checkbox' != $args['type'] );
$key = (array) $args['name'];
$key = end( $key );
$value = get_metadata( $meta_type, $object_id, $key, $single );
return self::input_with_value( $args, $value );
}
/**
* Updates metadata for passed list of fields.
*
* @param array $fields
* @param array $data
* @param int $object_id The object ID the metadata is attached to
* @param string $meta_type (optional) Defaults to 'post'
*
* @return void
*/
public static function update_meta( $fields, $data, $object_id, $meta_type = 'post' ) {
foreach ( $fields as $field_args ) {
$key = $field_args['name'];
if ( 'checkbox' == $field_args['type'] ) {
$new_values = isset( $data[ $key ] ) ? $data[ $key ] : array();
$old_values = get_metadata( $meta_type, $object_id, $key );
foreach ( array_diff( $new_values, $old_values ) as $value ) {
add_metadata( $meta_type, $object_id, $key, $value );
}
foreach ( array_diff( $old_values, $new_values ) as $value ) {
delete_metadata( $meta_type, $object_id, $key, $value );
}
} else {
$value = isset( $data[ $key ] ) ? $data[ $key ] : '';
if ( '' === $value ) {
delete_metadata( $meta_type, $object_id, $key );
} else {
update_metadata( $meta_type, $object_id, $key, $value );
}
}
}
}
/**
* Sets value using a reference.
*
* @param array $arr
* @param string $name
* @param mixed $value
*
* @return void
*/
private static function set_value( &$arr, $name, $value ) {
$name = (array) $name;
$final_key = array_pop( $name );
while ( ! empty( $name ) ) {
$key = array_shift( $name );
if ( ! isset( $arr[ $key ] ) ) {
$arr[ $key ] = array();
}
$arr =& $arr[ $key ];
}
$arr[ $final_key ] = $value;
}
}
/**
* A wrapper for scbForms, containing the formdata.
*/
class scbForm {
protected $data = array();
protected $prefix = array();
/**
* Constructor.
*
* @param array $data
* @param string|boolean $prefix (optional)
*
* @return void
*/
public function __construct( $data, $prefix = false ) {
if ( is_array( $data ) ) {
$this->data = $data;
}
if ( $prefix ) {
$this->prefix = (array) $prefix;
}
}
/**
* Traverses the form.
*
* @param string $path
*
* @return object A scbForm
*/
public function traverse_to( $path ) {
$data = scbForms::get_value( $path, $this->data );
$prefix = array_merge( $this->prefix, (array) $path );
return new scbForm( $data, $prefix );
}
/**
* Generates form field.
*
* @param array $args
*
* @return string
*/
public function input( $args ) {
$value = scbForms::get_value( $args['name'], $this->data );
if ( ! empty( $this->prefix ) ) {
$args['name'] = array_merge( $this->prefix, (array) $args['name'] );
}
return scbForms::input_with_value( $args, $value );
}
}
/**
* Interface for form fields.
*/
interface scbFormField_I {
/**
* Generate the corresponding HTML for a field.
*
* @param mixed $value (optional) The value to use.
*
* @return string
*/
function render( $value = null );
/**
* Validates a value against a field.
*
* @param mixed $value The value to check.
*
* @return mixed null if the validation failed, sanitized value otherwise.
*/
function validate( $value );
}
/**
* Base class for form fields implementations.
*/
abstract class scbFormField implements scbFormField_I {
protected $args;
/**
* Creates form field.
*
* @param array|scbFormField_I $args
*
* @return mixed false on failure or instance of form class
*/
public static function create( $args ) {
if ( is_a( $args, 'scbFormField_I' ) ) {
return $args;
}
if ( empty( $args['name'] ) ) {
return trigger_error( 'Empty name', E_USER_WARNING );
}
if ( isset( $args['value'] ) && is_array( $args['value'] ) ) {
$args['choices'] = $args['value'];
unset( $args['value'] );
}
if ( isset( $args['values'] ) ) {
$args['choices'] = $args['values'];
unset( $args['values'] );
}
if ( isset( $args['extra'] ) && ! is_array( $args['extra'] ) ) {
$args['extra'] = shortcode_parse_atts( $args['extra'] );
}
$args = wp_parse_args( $args, array(
'desc' => '',
'desc_pos' => 'after',
'wrap' => scbForms::TOKEN,
'wrap_each' => scbForms::TOKEN,
) );
// depends on $args['desc']
if ( isset( $args['choices'] ) ) {
self::_expand_choices( $args );
}
switch ( $args['type'] ) {
case 'radio':
return new scbRadiosField( $args );
case 'select':
return new scbSelectField( $args );
case 'checkbox':
if ( isset( $args['choices'] ) ) {
return new scbMultipleChoiceField( $args );
} else {
return new scbSingleCheckboxField( $args );
}
case 'custom':
return new scbCustomField( $args );
default:
return new scbTextField( $args );
}
}
/**
* Constructor.
*
* @param array $args
*
* @return void
*/
protected function __construct( $args ) {
$this->args = $args;
}
/**
* Magic method: $field->arg
*
* @param string $key
*
* @return mixed
*/
public function __get( $key ) {
return $this->args[ $key ];
}
/**
* Magic method: isset( $field->arg )
*
* @param string $key
*
* @return bool
*/
public function __isset( $key ) {
return isset( $this->args[ $key ] );
}
/**
* Generate the corresponding HTML for a field.
*
* @param mixed $value (optional)
*
* @return string
*/
public function render( $value = null ) {
if ( null === $value && isset( $this->default ) ) {
$value = $this->default;
}
$args = $this->args;
if ( null !== $value ) {
$this->_set_value( $args, $value );
}
$args['name'] = scbForms::get_name( $args['name'] );
return str_replace( scbForms::TOKEN, $this->_render( $args ), $this->wrap );
}
/**
* Mutate the field arguments so that the value passed is rendered.
*
* @param array $args
* @param mixed $value
*/
abstract protected function _set_value( &$args, $value );
/**
* The actual rendering.
*
* @param array $args
*/
abstract protected function _render( $args );
/**
* Handle args for a single checkbox or radio input.
*
* @param array $args
*
* @return string
*/
protected static function _checkbox( $args ) {
$args = wp_parse_args( $args, array(
'value' => true,
'desc' => null,
'checked' => false,
'extra' => array(),
) );
$args['extra']['checked'] = $args['checked'];
if ( is_null( $args['desc'] ) && ! is_bool( $args['value'] ) ) {
$args['desc'] = str_replace( '[]', '', $args['value'] );
}
return self::_input_gen( $args );
}
/**
* Generate html with the final args.
*
* @param array $args
*
* @return string
*/
protected static function _input_gen( $args ) {
$args = wp_parse_args( $args, array(
'value' => null,
'desc' => null,
'extra' => array(),
) );
$args['extra']['name'] = $args['name'];
if ( 'textarea' == $args['type'] ) {
$input = html( 'textarea', $args['extra'], esc_textarea( $args['value'] ) );
} else {
$args['extra']['value'] = $args['value'];
$args['extra']['type'] = $args['type'];
$input = html( 'input', $args['extra'] );
}
return self::add_label( $input, $args['desc'], $args['desc_pos'] );
}
/**
* Wraps a form field in a label, and position field description.
*
* @param string $input
* @param string $desc
* @param string $desc_pos
*
* @return string
*/
protected static function add_label( $input, $desc, $desc_pos ) {
return html( 'label', self::add_desc( $input, $desc, $desc_pos ) ) . "\n";
}
/**
* Adds description before/after the form field.
*
* @param string $input
* @param string $desc
* @param string $desc_pos
*
* @return string
*/
protected static function add_desc( $input, $desc, $desc_pos ) {
if ( empty( $desc ) ) {
return $input;
}
if ( 'before' == $desc_pos ) {
return $desc . ' ' . $input;
} else {
return $input . ' ' . $desc;
}
}
/**
* @param array $args
*/
private static function _expand_choices( &$args ) {
$choices =& $args['choices'];
if ( ! empty( $choices ) && ! self::is_associative( $choices ) ) {
if ( is_array( $args['desc'] ) ) {
$choices = array_combine( $choices, $args['desc'] ); // back-compat
$args['desc'] = false;
} else if ( ! isset( $args['numeric'] ) || ! $args['numeric'] ) {
$choices = array_combine( $choices, $choices );
}
}
}
/**
* Checks if passed array is associative.
*
* @param array $array
*
* @return bool
*/
private static function is_associative( $array ) {
$keys = array_keys( $array );
return array_keys( $keys ) !== $keys;
}
}
/**
* Text form field.
*/
class scbTextField extends scbFormField {
/**
* Sanitizes value.
*
* @param string $value
*
* @return string
*/
public function validate( $value ) {
$sanitize = isset( $this->sanitize ) ? $this->sanitize : 'wp_kses_data';
return call_user_func( $sanitize, $value, $this );
}
/**
* Generate the corresponding HTML for a field.
*
* @param array $args
*
* @return string
*/
protected function _render( $args ) {
$args = wp_parse_args( $args, array(
'value' => '',
'desc_pos' => 'after',
'extra' => array( 'class' => 'regular-text' ),
) );
if ( ! isset( $args['extra']['id'] ) && ! is_array( $args['name'] ) && false === strpos( $args['name'], '[' ) ) {
$args['extra']['id'] = $args['name'];
}
return scbFormField::_input_gen( $args );
}
/**
* Sets value using a reference.
*
* @param array $args
* @param string $value
*
* @return void
*/
protected function _set_value( &$args, $value ) {
$args['value'] = $value;
}
}
/**
* Base class for form fields with single choice.
*/
abstract class scbSingleChoiceField extends scbFormField {
/**
* Validates a value against a field.
*
* @param mixed $value
*
* @return mixed|null
*/
public function validate( $value ) {
if ( isset( $this->choices[ $value ] ) ) {
return $value;
}
return null;
}
/**
* Generate the corresponding HTML for a field.
*
* @param array $args
*
* @return string
*/
protected function _render( $args ) {
$args = wp_parse_args( $args, array(
'numeric' => false, // use numeric array instead of associative
) );
if ( isset( $args['selected'] ) ) {
$args['selected'] = (string) $args['selected'];
} else {
$args['selected'] = array( 'foo' ); // hack to make default blank
}
return $this->_render_specific( $args );
}
/**
* Sets value using a reference.
*
* @param array $args
* @param string $value
*
* @return void
*/
protected function _set_value( &$args, $value ) {
$args['selected'] = $value;
}
/**
* Generate the corresponding HTML for a field.
*
* @param array $args
*
* @return string
*/
abstract protected function _render_specific( $args );
}
/**
* Dropdown field.
*/
class scbSelectField extends scbSingleChoiceField {
/**
* Generate the corresponding HTML for a field.
*
* @param array $args
*
* @return string
*/
protected function _render_specific( $args ) {
$args = wp_parse_args( $args, array(
'text' => false,
'extra' => array(),
) );
$options = array();
if ( false !== $args['text'] ) {
$options[] = array(
'value' => '',
'selected' => ( $args['selected'] === array( 'foo' ) ),
'title' => $args['text'],
);
}
foreach ( $args['choices'] as $value => $title ) {
$value = (string) $value;
$options[] = array(
'value' => $value,
'selected' => ( $value == $args['selected'] ),
'title' => $title,
);
}
$opts = '';
foreach ( $options as $option ) {
$opts .= html( 'option', array( 'value' => $option['value'], 'selected' => $option['selected'] ), $option['title'] );
}
$args['extra']['name'] = $args['name'];
$input = html( 'select', $args['extra'], $opts );
return scbFormField::add_label( $input, $args['desc'], $args['desc_pos'] );
}
}
/**
* Radio field.
*/
class scbRadiosField extends scbSelectField {
/**
* Generate the corresponding HTML for a field.
*
* @param array $args
*
* @return string
*/
protected function _render_specific( $args ) {
if ( array( 'foo' ) === $args['selected'] ) {
// radio buttons should always have one option selected
$args['selected'] = key( $args['choices'] );
}
$opts = '';
foreach ( $args['choices'] as $value => $title ) {
$value = (string) $value;
$single_input = scbFormField::_checkbox( array(
'name' => $args['name'],
'type' => 'radio',
'value' => $value,
'checked' => ( $value == $args['selected'] ),
'desc' => $title,
'desc_pos' => 'after',
) );
$opts .= str_replace( scbForms::TOKEN, $single_input, $args['wrap_each'] );
}
return scbFormField::add_desc( $opts, $args['desc'], $args['desc_pos'] );
}
}
/**
* Checkbox field with multiple choices.
*/
class scbMultipleChoiceField extends scbFormField {
/**
* Validates a value against a field.
*
* @param mixed $value
*
* @return array
*/
public function validate( $value ) {
return array_intersect( array_keys( $this->choices ), (array) $value );
}
/**
* Generate the corresponding HTML for a field.
*
* @param array $args
*
* @return string
*/
protected function _render( $args ) {
$args = wp_parse_args( $args, array(
'numeric' => false, // use numeric array instead of associative
'checked' => null,
) );
if ( ! is_array( $args['checked'] ) ) {
$args['checked'] = array();
}
$opts = '';
foreach ( $args['choices'] as $value => $title ) {
$single_input = scbFormField::_checkbox( array(
'name' => $args['name'] . '[]',
'type' => 'checkbox',
'value' => $value,
'checked' => in_array( $value, $args['checked'] ),
'desc' => $title,
'desc_pos' => 'after',
) );
$opts .= str_replace( scbForms::TOKEN, $single_input, $args['wrap_each'] );
}
return scbFormField::add_desc( $opts, $args['desc'], $args['desc_pos'] );
}
/**
* Sets value using a reference.
*
* @param array $args
* @param string $value
*
* @return void
*/
protected function _set_value( &$args, $value ) {
$args['checked'] = (array) $value;
}
}
/**
* Checkbox field.
*/
class scbSingleCheckboxField extends scbFormField {
/**
* Validates a value against a field.
*
* @param mixed $value
*
* @return boolean
*/
public function validate( $value ) {
return (bool) $value;
}
/**
* Generate the corresponding HTML for a field.
*
* @param array $args
*
* @return string
*/
protected function _render( $args ) {
$args = wp_parse_args( $args, array(
'value' => true,
'desc' => null,
'checked' => false,
'extra' => array(),
) );
$args['extra']['checked'] = $args['checked'];
if ( is_null( $args['desc'] ) && ! is_bool( $args['value'] ) ) {
$args['desc'] = str_replace( '[]', '', $args['value'] );
}
return scbFormField::_input_gen( $args );
}
/**
* Sets value using a reference.
*
* @param array $args
* @param string $value
*
* @return void
*/
protected function _set_value( &$args, $value ) {
$args['checked'] = ( $value || ( isset( $args['value'] ) && $value == $args['value'] ) );
}
}
/**
* Wrapper field for custom callbacks.
*/
class scbCustomField implements scbFormField_I {
protected $args;
/**
* Constructor.
*
* @param array $args
*
* @return void
*/
function __construct( $args ) {
$this->args = wp_parse_args( $args, array(
'render' => 'var_dump',
'sanitize' => 'wp_filter_kses',
) );
}
/**
* Magic method: $field->arg
*
* @param string $key
*
* @return mixed
*/
public function __get( $key ) {
return $this->args[ $key ];
}
/**
* Magic method: isset( $field->arg )
*
* @param string $key
*
* @return boolean
*/
public function __isset( $key ) {
return isset( $this->args[ $key ] );
}
/**
* Generate the corresponding HTML for a field.
*
* @param mixed $value (optional)
*
* @return string
*/
public function render( $value = null ) {
return call_user_func( $this->render, $value, $this );
}
/**
* Sanitizes value.
*
* @param mixed $value
*
* @return mixed
*/
public function validate( $value ) {
return call_user_func( $this->sanitize, $value, $this );
}
}