field_default_form in core/modules/field/field.form.inc

Creates a form element for a field and can populate it with a default value.

field_multiple_value_form in core/modules/field/field.form.inc

Special handling to create form elements for multiple values.

image_field_widget_form in core/modules/image/image.field.inc

Implements hook_field_widget_form().

list_field_formatter_view in core/modules/field/modules/list/list.module

Implements hook_field_formatter_view().

number_field_widget_form in core/modules/field/modules/number/number.module

Implements hook_field_widget_form().

theme_date_combo in core/modules/date/date.theme.inc

Returns HTML for a start/end date combination on form.

views_handler_argument_field_list::summary_name in core/modules/field/views/views_handler_argument_field_list.inc

Provides the name to use for the summary. By default this is just the name field.

views_handler_argument_field_list_string::summary_name in core/modules/field/views/views_handler_argument_field_list_string.inc

Provides the name to use for the summary. By default this is just the name field.

_date_html5_field_widget_form in core/modules/date/date.elements.inc

Helper for the HTML5 widget form.

_options_prepare_options in core/modules/field/modules/options/options.module

Sanitizes the options.