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(defvar *form-renderer* nil "The current form renderer.
Bind using WITH-FORM-RENDERER.")
(defvar *default-form-renderer* :who
"The default form renderer.
The default renderer is CL-WHO.")
(defvar *form* nil "The current form.")
(defvar *base64-encode* nil "Whether to encode form parameters in base64 or not.")
(defvar *field-required-message* nil
"The default message to displayed when a field is required.")
(defun check-duplicate-fields (fields)
(when (not (equal
(length (remove-duplicates fields
:key (alexandria:compose 'string 'car)
:test 'string=))
(length fields)))
(error "Form contains duplicate fields")))
(defmethod call-with-form-renderer (renderer function)
(let ((*form-renderer* renderer))
(funcall function)))
(defmacro with-form-renderer (renderer &body body)
"Bind *FORM-RENDERER* to RENDERER and evaluate BODY in that context."
`(call-with-form-renderer ,renderer (lambda () ,@body)))
(defun call-with-form-theme (form-theme function)
(let ((theme (if (symbolp form-theme)
(make-instance form-theme)
form-theme)))
(let ((*form-theme* theme))
(funcall function))))
(defmacro with-form-theme (form-theme &body body)
"Bind *FORM-THEME* to FORM-THEME and evaluate BODY in that context."
`(call-with-form-theme ,form-theme (lambda () ,@body)))
(defun call-with-form (form function)
(let ((*form* form))
(funcall function)))
(defmacro with-form (form &body body)
"Bind *FORM* to FORM and evaluate BODY in that context."
`(call-with-form ,form (lambda () ,@body)))
(defmacro defform (form-name args fields)
"Define a form at top-level.
ARGS are the arguments passed to FORM class via MAKE-INSTANCE.
FIELDS are the form field specs.
@lisp
(forms:defform client-validated-form (:action \"/client-validation-post\"
:client-validation t)
((name :string :value \"\" :constraints (list (clavier:is-a-string)
(clavier:not-blank)
(clavier:len :max 5))
:validation-triggers '(:focusin))
(single :boolean :value t)
(sex :choice :choices (list \"Male\" \"Female\") :value \"Male\")
(age :integer :constraints (list (clavier:is-an-integer)
(clavier:greater-than -1)
(clavier:less-than 200)))
(email :email)
(submit :submit :label \"Create\")))
@end lisp"
(check-duplicate-fields fields)
(alexandria:with-gensyms (fargs)
`(setf (get ',form-name :form)
(lambda (&rest ,fargs)
(apply #'make-instance
'form
:name ',form-name
:fields (list ,@(loop for field in fields
collect
(destructuring-bind (field-name field-type &rest field-args) field
`(cons ',field-name (make-form-field ,field-type :name ',(intern (string field-name)) ,@field-args)))))
(append ,fargs
(list ,@args)))))))
(defmacro defform-builder (form-name args &body body)
"Registers a function with arguments ARGS and body BODY as a form builder.
BODY is expected to instantiate a FORM object using ARGS in some way.
FORM-NAME is the symbol under which the FORM is registered.
Use FIND-FORM with FORM-NAME and expected arguments to obtain the registered form."
(alexandria:with-unique-names (form)
`(setf (get ',form-name :form)
(lambda ,args
(let ((,form (progn ,@body)))
(check-type ,form forms:form)
(setf (form-name ,form) ',form-name)
,form)))))
(defun make-form (name fields &rest options)
(apply #'make-instance
'form
:name name
:fields (make-form-fields fields)
options))
(defun make-form-fields (fields)
(loop for field in fields
collect
(destructuring-bind (field-name field-type &rest field-args) field
(cons field-name (apply #'make-form-field field-type
:name field-name field-args)))))
(defun find-form (name &rest args)
"Get the form named NAME.
ARGS is the list of arguments to pass to a possible form builder function.
See: DEFFORM-BUILDER macro."
(let ((form-builder (get name :form)))
(when (not form-builder)
(error "Form not found: ~A" name))
(apply form-builder args)))
(defun get-form (&rest args)
(warn "FORMS:GET-FORM is deprecated. Use FORMS:FIND-FORM instead.")
(apply #'find-form args))
(defmacro with-form-fields (fields form &body body)
"Bind FIELDS to the form fields in FORM.
Example:
@lisp
(with-form-fields (name) form
(print (field-value name)))
@end lisp
Also see: WITH-FORM-FIELD-VALUES "
`(let ,(loop for field in fields
collect `(,field (get-field ,form ',field)))
,@body))
(defmacro with-form-field-values (fields form &body body)
"Bind the value of FIELDS in FORM.
Example:
@lisp
(with-form-field-values (name) form
(print name))
@end lisp"
`(let ,(loop for field in fields
collect `(,field (field-value (get-field ,form ',field))))
,@body))
(defun get-field (form field-name &optional (error-p t))
(or
(cdr (assoc field-name (form-fields form)))
(when error-p
(error "Field ~S not found in ~A" field-name form))))
(defun get-field-value (form field-name &optional (error-p t))
(declare (ignorable error-p))
(field-value (get-field form field-name)))
(defun set-field-value (form field-name value)
(setf (field-value (get-field form field-name)) value))
(defclass form ()
((id :initarg :id
:accessor form-id
:initform (string (gensym))
:type string
:documentation "The form id")
(name :initarg :name
:accessor form-name
:initform (error "Provide a name for the form")
:type symbol
:documentation "The form name")
(action :initarg :action
:initform nil
:type (or null string)
:accessor form-action
:documentation "The form action")
(method :initarg :method
:initform :post
:type (member :get :post)
:accessor form-method
:documentation "The form method")
(enctype :initarg :enctype
:initform nil
:type (or null string)
:accessor form-enctype
:documentation "Form encoding type. i.e. Use multipart/form-data for file uploads")
(fields :initarg :fields
:initform nil
:accessor form-fields
:documentation "Form fields")
(model :initarg :model
:initform nil
:accessor form-model
:documentation "The form model object")
(csrf-protection :initarg :csrf-protection
:initform nil
:type boolean
:accessor form-csrf-protection-p
:documentation "T when csrf protection is enabled")
(csrf-field-name :initarg :csrf-field-name
:initform "_token"
:type (or null string)
:accessor form-csrf-field-name
:documentation "csrf field name")
(errors :initform nil
:accessor form-errors
:type list
:documentation "Form errors after validation. An association list with elements (<field> . <field errors strings list>).")
(display-errors :initarg :display-errors
:initform (list :list :inline)
:type list
:accessor display-errors
:documentation "A list containing the places where to display errors. Valid options are :list and :inline")
(client-validation :initarg :client-validation
:initform nil
:type boolean
:accessor client-validation
:documentation "When T, form client validation is enabled"))
(:documentation "A form"))
(defmethod print-object ((form form) stream)
(print-unreadable-object (form stream :type t :identity t)
(format stream "~A~@{ ~A~}"
(form-name form)
(form-action form))))
(defmethod initialize-instance :after ((form form) &rest initargs)
(declare (ignorable initargs))
(loop for field in (form-fields form)
do
(setf (field-form (cdr field)) form)))
(defun post-parameters (&optional (request (backend-request)))
(let ((post-parameters (request-post-parameters request)))
(if *base64-encode*
(mapcar (lambda (param)
(cons (base64:base64-string-to-string (car param) :uri t)
(cdr param)))
post-parameters)
post-parameters)))
;; csrf api
(defgeneric set-form-session-csrf-token (form)
(:documentation "Set csrf token for FORM and return the token."))
(defclass form-field ()
((name :initarg :name
:initform (error "Provide the field name")
:accessor field-name
:type symbol
:documentation "The field name")
(label :initarg :label
:initform nil
:type (or null string)
:documentation "The field label")
(value :initarg :value
:initform nil
:documentation "Field value")
(default-value :initarg :default-value
:initform nil
:accessor field-default-value
:documentation "Value to use when the field value is nil")
(placeholder :initarg :placeholder
:accessor field-placeholder
:type (or null string)
:initform nil
:documentation "Field placeholder (text that appears when the field is empty)")
(help-text :initarg :help-text
:initform nil
:type (or null string)
:accessor field-help-text
:documentation "Field help text")
(parser :initarg :parser
:initform nil
:accessor field-parser
:type (or null symbol function)
:documentation "Custom field value parser")
(formatter :initarg :formatter
:initform nil
:type (or null symbol function)
:accessor field-formatter
:documentation "The field formatter. The function takes two arguments, a VALUE and STREAM to format it into.")
(constraints :initarg :constraints
:initform nil
:accessor field-constraints
:documentation "A list of CLAVIER validators.")
(required :initarg :required-p
:initform t
:type boolean
:accessor field-required-p
:documentation "Whether the field is required")
(required-message :initarg :required-message
:initform *field-required-message*
:accessor field-required-message
:type (or null string)
:documentation "Message to display when field is required")
(invalid-message :initarg :invalid-message
:initform nil
:accessor field-invalid-message
:type (or null string function)
:documentation "Message to display when field is invalid")
(read-only :initarg :read-only-p
:initform nil
:type boolean
:accessor field-read-only-p
:documentation "Whether the field is read only")
(disabled :initarg :disabled-p
:initform nil
:type boolean
:accessor field-disabled-p
:documentation "Whether the field is disabled")
(accessor :initarg :accessor
:initform nil
:type (or null symbol)
:accessor field-accessor
:documentation "The field accessor to the underlying model")
(reader :initarg :reader
:initform nil
:type (or null symbol function)
:documentation "The function to use to read from the underlying model")
(writer :initarg :writer
:initform nil
:type (or null symbol function)
:documentation "The function to use to write to underlying model")
(trim :initarg :trim-p
:initform t
:type boolean
:accessor field-trim-p
:documentation "Trim the input")
(validation-triggers :initarg :validation-triggers
:initform nil
:accessor field-validation-triggers
:documentation "Client side validation triggers. A list of :change, :focus, :focusout, :focusin, etc")
(html-name :initarg :html-name
:type string
:documentation "The name to use in HTML. Unbound by default. If unbound, a string representation of FIELD-NAME is used. See FIELD-REQUEST-NAME.")
(form :initarg :form
:initform nil
:type (or null form)
:accessor field-form
:documentation "The form the field belongs to"))
(:documentation "A form field"))
(defmethod print-object ((field form-field) stream)
(print-unreadable-object (field stream :type t :identity t)
(format stream "~S value: ~A"
(field-name field)
(field-value field))))
(defmethod field-label ((field form-field))
(or (slot-value field 'label)
(str:sentence-case (princ-to-string (field-name field)))))
(defun add-field (form field)
(setf (form-fields form)
(append (form-fields form)
(list (cons (field-name field) field)))))
(defun remove-field (form field)
(setf (form-fields form)
(remove (if (not (symbolp field))
(field-name field)
field)
(form-fields form)
:key 'car)))
(defmethod field-render-label-p ((field form-field))
t)
(defvar *field-path* nil
"This is the path in a tree of forms (subform fields) used to calculate its request name.")
(defgeneric field-add-to-path (form-field form &optional path)
(:method (form-field form &optional (path *field-path*))
(let ((html-name (if (slot-boundp form-field 'html-name)
(slot-value form-field 'html-name)
(string-downcase (string (field-name form-field))))))
(cons html-name path))))
(defun field-request-name (form-field form)
(declare (ignorable form form-field))
(str:join #\. (remove-if #'str:emptyp (mapcar #'princ-to-string (reverse *field-path*)))))
(defun render-field-request-name (form-field form)
(let ((request-name (field-request-name form-field form)))
(if *base64-encode*
(base64:string-to-base64-string request-name :uri t)
request-name)))
(defmethod field-reader ((field form-field))
(or (slot-value field 'reader)
(field-accessor field)))
(defmethod field-writer ((field form-field))
(or (slot-value field 'writer)
(and (field-accessor field)
(fdefinition `(setf ,(field-accessor field))))))
(defmethod field-value ((field form-field))
(if (and (field-reader field) (form-model (field-form field)))
(funcall (field-reader field)
(form-model (field-form field)))
(slot-value field 'value)))
(defmethod field-value :around ((field form-field))
(or (call-next-method)
(field-default-value field)))
(defmethod (setf field-value) (value (field form-field))
(if (and (field-writer field) (form-model (field-form field)))
(funcall (field-writer field)
value
(form-model (field-form field)))
(setf (slot-value field 'value) value)))
(defun fill-form-from-model (form model)
"Fill a FORM from a MODEL.
Read MODEL using FORM accessors and set the FORM field values."
(loop for field in (mapcar 'cdr (forms::form-fields form))
when (forms:field-reader field)
do (setf (forms:field-value field)
(funcall (forms:field-reader field) model)))
form)
(defun fill-model-from-form (form model)
"Set a MODEL's values from FORM field values."
(loop for field in (mapcar 'cdr (forms::form-fields form))
when (forms:field-writer field)
do (funcall (forms:field-writer field)
(forms:field-value field)
model)))
(defclass field-validator (clavier::validator)
((field :initarg :field
:initform (error "Provide the field")
:accessor validator-field
:documentation "The validator field"))
(:metaclass closer-mop:funcallable-standard-class)
(:documentation "Generic field validator. Needs a field to be initialized."))
(defun empty-value-p (val)
(or (null val)
(and (stringp val)
(zerop (length val)))))
(defgeneric validate-form-field (form-field))
(defmethod validate-form-field :around ((form-field form-field))
(cond
((and (field-required-p form-field)
(empty-value-p (field-value form-field)))
(values nil
(list (format nil (or (field-required-message form-field)
"~A is required")
(or (field-label form-field)
(field-name form-field))))))
((and (not (field-required-p form-field))
(empty-value-p (field-value form-field)))
(values t nil))
(t (call-next-method))))
(defmethod validate-form-field ((form-field form-field))
(let ((errors nil))
(loop for constraint in (field-constraints form-field)
do
(multiple-value-bind (valid-p error-msg)
(funcall constraint
(field-value form-field))
(when (not valid-p)
(push error-msg errors))))
(values (not errors)
errors)))
(defmethod field-valid-p ((form-field form-field) &optional (form *form*))
"Determines if a field is valid. This method assumes the form has already
been validated via validate-form."
(not (find form-field (form-errors form) :key 'car)))
(defgeneric format-field-value (form-field field-value &optional stream))
(defmethod format-field-value :around ((form-field form-field) field-value &optional (stream *standard-output*))
(if (field-formatter form-field)
(funcall (field-formatter form-field)
field-value stream)
(call-next-method)))
(defmethod format-field-value ((form-field form-field) field-value &optional (stream *standard-output*))
(format stream "~A" field-value))
(defun format-field-value-to-string (form-field &optional (field-value (field-value form-field)))
(with-output-to-string (s)
(format-field-value form-field field-value s)))
(defmethod form-session-csrf-entry ((form form))
(alexandria:make-keyword (format nil "~A-CSRF-TOKEN" (form-name form))))
(defun validate-form (&optional (form *form*))
"Validates a form. Usually called after HANDLE-REQUEST. Returns multiple values; first value is true if the form is valid; second value a list of errors.
The list of errors is an association list with elements (<field> . <field errors strings list>)."
(setf (form-errors form)
(loop for field in (form-fields form)
appending
(multiple-value-bind (valid-p errors)
(validate-form-field (cdr field))
(when (not valid-p)
(list (cons (cdr field) errors))))))
(values (null (form-errors form))
(form-errors form)))
(defun form-valid-p (form)
(null (form-errors form)))
(defun add-form-error (field error-msg &optional (form *form*))
"Add an error on FIELD"
(let ((field (if (symbolp field)
(forms::get-field form field)
field)))
(if (assoc field (form-errors form))
(push error-msg (cdr (assoc field (form-errors form))))
(push (cons field (list error-msg))
(form-errors form)))))
(defun render-form (&optional (form *form*) &rest args)
"Top level function to render the web form FORM.
*FORM-RENDERER* and *FORM-THEME* need to be bound.
See: WITH-FORM-RENDERER, WITH-FORM-THEME"
(apply #'renderer-render-form
(or *form-renderer* (error "Form renderer is unbound. See *FORM-RENDERER* and WITH-FORM-RENDERER."))
*form-theme* form args))
(defun render-form-start (&optional (form *form*) &rest args)
"Render only the beggining of the web form FORM.
Use RENDER-FIELD, RENDER-FIELD-LABEL, etc manually, after."
(apply #'renderer-render-form-start
(or *form-renderer*
(error "Form renderer is unbound. See *FORM-RENDERER* and WITH-FORM-RENDERER."))
*form-theme* form args))
(defun render-form-end (&optional (form *form*))
"Render the end of the web form FORM."
(renderer-render-form-end *form-renderer* *form-theme* form))
(defun render-form-errors (&optional (form *form*) &rest args)
"Render a section for displaying form validation errors."
(when (member :list (display-errors form))
(apply #'renderer-render-form-errors *form-renderer* *form-theme* form args)))
(defun render-field (field &optional (form *form*) &rest args)
"Render form FIELD, both label and widget."
(let ((field (if (symbolp field)
(get-field form field)
field)))
(apply #'renderer-render-field *form-renderer* *form-theme* field form args)))
(defun render-field-label (field &optional (form *form*) &rest args)
"Render the label of FIELD."
(let ((field (if (symbolp field)
(get-field form field)
field)))
(unless (typep field 'submit-form-field)
(apply #'renderer-render-field-label *form-renderer* *form-theme* field form args))))
(defun render-field-errors (field &optional (form *form*) &rest args)
"Render the validation errors associated with FIELD."
(let ((field (if (symbolp field)
(get-field form field)
field)))
(apply #'renderer-render-field-errors *form-renderer* *form-theme* field form args)))
(defun render-field-widget (field &optional (form *form*) &rest args)
"Render FIELD widget."
(let ((field (if (symbolp field)
(get-field form field)
field)))
(apply #'renderer-render-field-widget *form-renderer* *form-theme* field form args)))
(defgeneric renderer-render-form (renderer theme form &rest args))
(defgeneric renderer-render-form-start (renderer theme form &rest args))
(defgeneric renderer-render-form-end (renderer theme form))
(defgeneric renderer-render-form-errors (renderer theme form &rest args))
(defgeneric renderer-render-field (renderer theme field form &rest args))
(defgeneric renderer-render-field-label (renderer theme field form &rest args))
(defgeneric renderer-render-field-errors (renderer theme field form &rest args))
(defgeneric renderer-render-field-widget (renderer theme field form &rest argss))
(defmethod renderer-render-field-errors :around (renderer theme field form &rest args)
(declare (ignorable args))
;; Render field errors inline only when :inline is specified on form
(when (member :inline (forms::display-errors form))
(call-next-method)))
(defmethod renderer-render-form-errors :around (renderer theme form &rest args)
(declare (ignorable args))
;; Render form errors only when :list is specified on form
(when (member :list (forms::display-errors form))
(call-next-method)))
(defmethod renderer-render-field-widget :around (renderer theme field form &rest args)
(declare (ignorable args))
(let ((*field-path* (field-add-to-path field form *field-path*)))
(call-next-method)))
(defgeneric backend-request ()
(:documentation "Return current request object for backend"))
(defgeneric backend-handle-request (form request)
(:documentation "Handle REQUEST for FORM.
Populates FORM from parameters in HTTP request. After this, the form field contains values, but they are not validated. To validate call VALIDATE-FORM after."))
;; Abstract away the HTTP request, so we can make cl-forms testable
(defgeneric request-post-parameters (request))
(defun handle-request (&optional (form *form*) (request (backend-request)))
"Populates FORM from parameters in HTTP request. After this, the form field contains values, but they are not validated. To validate call VALIDATE-FORM after."
(backend-handle-request form request))
(defgeneric field-read-from-request (field form parameters))
(defmethod field-read-from-request :around (field form parameters)
(let ((*field-path* (field-add-to-path field form *field-path*)))
(call-next-method)))
(defmethod field-read-from-request :after (field form parameters)
"Use the parser function after reading the value from the request"
(when (field-parser field)
(setf (field-value field)
(funcall (field-parser field)
(field-value field)))))
(defgeneric make-form-field (field-type &rest args))
(defmethod make-form-field (field-type &rest args)
"Provide a good error message when a field cannot be built"
(if (and (symbolp field-type) (not (keywordp field-type)))
(apply #'make-instance field-type args)
;; else
(error "Form field of type ~s not defined. Check that ~s is a correct field type." field-type field-type)))
;; Form templates
(defun collect-replace-fields (form)
(let (fields)
(let ((new-form (%collect-replace-fields
form
(lambda (field) (push field fields)))))
(values new-form fields))))
(defun %collect-replace-fields (form collect-field)
(if (atom form)
form
(if (eql (first form) 'forms:form-field)
(progn
(funcall collect-field (cdr form))
`(forms:render-field ',(second form)))
(loop for part in form
collect
(%collect-replace-fields part collect-field)))))
(defmacro with-form-template ((&optional form-var) form-name args &body body)
"Define a FORM named FORM-NAME and render it at the same time."
(multiple-value-bind (new-body fields) (collect-replace-fields body)
(let ((form-bind (or form-var (gensym "FORM"))))
`(progn
(defform ,form-name ,args
,fields)
(let ((,form-bind (or ,form-var (find-form ',form-name))))
(with-form ,form-bind
(render-form-start)
,@new-body
(render-form-end)))))))
(defun make-formatter (symbol)
"Create a field formatter. SYMBOL is the function to call."
(lambda (x stream)
(format stream "~A" (funcall symbol x))))
;; Type declarations
(declaim
(ftype (function (form t) (values t &optional)) fill-form-from-model)
(ftype (function (form t) (values null &optional)) fill-model-from-form)
(ftype (function (form) list) form-fields)
(ftype (function (&optional form &rest t) string) render-form)
(ftype (function (&optional form &rest t) string) render-form-errors)
(ftype (function (form-field &optional form &rest t) string) render-field-errors)
(ftype (function (form-field) *) field-value)
(ftype (function (form-field) (or null symbol)) field-accessor)
(ftype (function ((or symbol form-field) &optional form &rest t) string) render-field)
(ftype (function (form-field) string) field-label)
(ftype (function (form symbol &optional boolean) (or form-field null)) get-field)
(ftype (function (form-field) (or null symbol function)) field-parser)
(ftype (function (form-field &optional t) (values simple-string &optional))
cl-forms:format-field-value-to-string)
(ftype (function (form (or symbol form-field) &optional boolean) *) cl-forms:get-field-value)
(ftype function cl-forms:render-form-start)
(ftype (function (&optional t) *) cl-forms:render-form-end)
(ftype (function (t) (values function &optional)) cl-forms:make-formatter)
(ftype (function (&optional form) (values boolean t &optional))
cl-forms:validate-form)
(ftype (function (form-field t &optional t) *) cl-forms:format-field-value)
(ftype (function (form) boolean) cl-forms:form-valid-p)
(ftype (function (t) *) cl-forms:field-formatter)
(ftype (function (form) list) form-errors)
(ftype (function (symbol &rest t) form) get-form find-form)
(ftype (function (t &rest t) *) cl-forms:render-field-widget)
(ftype (function (t) *) cl-forms:field-reader)
(ftype (function (t) *) cl-forms:field-writer)
(ftype (function ((or symbol form-field) &optional form) boolean) cl-forms:field-valid-p)
(ftype (function ((or symbol form-field) &optional form &rest t) *) cl-forms:render-field-label)
(ftype (function (t t &optional t) *) cl-forms:add-form-error)
(ftype (function (t t t) *) cl-forms:set-field-value)
(ftype (function (form (or symbol form-field)) *) remove-field)
(ftype (function (form form-field) *) cl-forms:add-field))
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