1 (in-package :parenscript
)
3 ;;; reserved symbols/literals
5 (defvar *ps-reserved-symbol-names
* ()) ;; symbol names reserved for PS/JS literals
7 (defun add-ps-literal (name)
8 (push (symbol-name name
) *ps-reserved-symbol-names
*))
10 (defun ps-literal-p (symbol)
11 (find (symbol-name symbol
) *ps-reserved-symbol-names
* :test
#'equalp
))
15 (defvar *ps-special-forms
* (make-hash-table :test
'eq
))
17 (defun get-ps-special-form (name)
18 (gethash name
*ps-special-forms
*))
20 (defmacro define-ps-special-form
(name lambda-list
&rest body
)
21 "Define a special form NAME. The first argument given to the special
22 form is a keyword indicating whether the form is expected to produce
23 an :expression or a :statement. The resulting Parenscript language
24 types are appended to the ongoing javascript compilation."
25 (let ((arglist (gensym "ps-arglist-")))
26 `(setf (gethash ',name
*ps-special-forms
*)
27 (lambda (&rest
,arglist
)
28 (destructuring-bind ,lambda-list
32 (defun undefine-ps-special-form (name)
33 (remhash name
*ps-special-forms
*))
35 (defun ps-special-form-p (form)
38 (gethash (car form
) *ps-special-forms
*)))
42 (defvar *enclosing-lexical-block-declarations
* ()
43 "This special variable is expected to be bound to a fresh list by
44 special forms that introduce a new JavaScript lexical block (currently
45 function definitions and lambdas). Enclosed special forms are expected
46 to push variable declarations onto the list when the variables
47 declaration cannot be made by the enclosed form \(for example, a
48 \(x,y,z\) expression progn\). It is then the responsibility of the
49 enclosing special form to introduce the variable bindings in its
52 (defvar *ps-special-variables
* ())
56 (defun op-form-p (form)
58 (not (ps-special-form-p form
))
59 (not (null (op-precedence (first form
))))))
61 (defun funcall-form-p (form)
63 (not (op-form-p form
))
64 (not (ps-special-form-p form
))))
66 (defun method-call-p (form)
67 (and (funcall-form-p form
)
68 (symbolp (first form
))
69 (eql (char (symbol-name (first form
)) 0) #\.
)))
72 (eval-when (:compile-toplevel
:load-toplevel
:execute
)
73 (defun make-macro-env-dictionary ()
74 (make-hash-table :test
'eq
))
75 (defvar *ps-macro-toplevel
* (make-macro-env-dictionary)
76 "Toplevel macro environment dictionary. Key is the symbol name of
77 the macro, value is (symbol-macro-p . expansion-function).")
78 (defvar *ps-macro-env
* (list *ps-macro-toplevel
*)
79 "Current macro environment.")
81 (defvar *ps-setf-expanders
* (make-macro-env-dictionary)
82 "Setf expander dictionary. Key is the symbol of the access
83 function of the place, value is an expansion function that takes the
84 arguments of the access functions as a first value and the form to be
85 stored as the second value.")
87 (defun get-macro-spec (name env-dict
)
88 "Retrieves the macro spec of the given name with the given environment dictionary.
89 SPEC is of the form (symbol-macro-p . expansion-function)."
90 (gethash name env-dict
))
91 (defsetf get-macro-spec
(name env-dict
)
93 `(setf (gethash ,name
,env-dict
) ,spec
)))
95 (defun lookup-macro-spec (name &optional
(environment *ps-macro-env
*))
96 "Looks up the macro spec associated with NAME in the given environment. A
97 macro spec is of the form (symbol-macro-p . function). Returns two values:
98 the SPEC and the parent macro environment.
100 NAME must be a symbol."
102 (do ((env environment
(cdr env
)))
104 (let ((val (get-macro-spec name
(car env
))))
106 (return-from lookup-macro-spec
107 (values val
(or (cdr env
)
108 (list *ps-macro-toplevel
*)))))))))
110 (defun ps-symbol-macro-p (name &optional
(environment *ps-macro-env
*))
111 "True if there is a Parenscript symbol macro named by the symbol NAME."
112 (and (symbolp name
) (car (lookup-macro-spec name environment
))))
114 (defun ps-macro-p (name &optional
(environment *ps-macro-env
*))
115 "True if there is a Parenscript macro named by the symbol NAME."
117 (let ((macro-spec (lookup-macro-spec name environment
)))
118 (and macro-spec
(not (car macro-spec
))))))
120 (defun lookup-macro-expansion-function (name &optional
(environment *ps-macro-env
*))
121 "Lookup NAME in the given macro expansion environment (which
122 defaults to the current macro environment). Returns the expansion
123 function and the parent macro environment of the macro."
124 (multiple-value-bind (macro-spec parent-env
)
125 (lookup-macro-spec name environment
)
126 (values (cdr macro-spec
) parent-env
)))
128 (defun make-ps-macro-function (args body
)
129 (let* ((whole-var (when (eql '&whole
(first args
)) (second args
)))
130 (effective-lambda-list (if whole-var
(cddr args
) args
))
131 (whole-arg (or whole-var
(gensym "ps-macro-form-arg-"))))
132 `(lambda (,whole-arg
)
133 (destructuring-bind ,effective-lambda-list
137 (defmacro defpsmacro
(name args
&body body
)
138 `(progn (undefine-ps-special-form ',name
)
139 (setf (get-macro-spec ',name
*ps-macro-toplevel
*)
140 (cons nil
,(make-ps-macro-function args body
)))
143 (defmacro define-ps-symbol-macro
(symbol expansion
)
144 `(progn (undefine-ps-special-form ',symbol
)
145 (setf (get-macro-spec ',symbol
*ps-macro-toplevel
*) (cons t
(lambda () ',expansion
)))
148 (defun import-macros-from-lisp (&rest names
)
149 "Import the named Lisp macros into the ParenScript macro
150 environment. When the imported macro is macroexpanded by ParenScript,
151 it is first fully macroexpanded in the Lisp macro environment, and
152 then that expansion is further expanded by ParenScript."
154 (eval `(defpsmacro ,name
(&rest args
)
155 (macroexpand `(,',name
,@args
))))))
157 (defmacro defmacro
/ps
(name args
&body body
)
158 "Define a Lisp macro and import it into the ParenScript macro environment."
159 `(progn (defmacro ,name
,args
,@body
)
160 (import-macros-from-lisp ',name
)))
162 (defmacro defmacro
+ps
(name args
&body body
)
163 "Define a Lisp macro and a ParenScript macro with the same macro
164 function (ie - the same result from macroexpand-1), for cases when the
165 two have different full macroexpansions (for example if the CL macro
166 contains implementation-specific code when macroexpanded fully in the
168 `(progn (defmacro ,name
,args
,@body
)
169 (defpsmacro ,name
,args
,@body
)))
171 (defun ps-macroexpand (form)
172 "Recursively macroexpands ParenScript macros and symbol-macros in
173 the given ParenScript form. Returns two values: the expanded form, and
174 whether any expansion was performed on the form or not."
176 (let ((op (car form
))
178 (cond ((equal op
'quote
) (values (if (equalp '(nil) args
) nil form
) ; leave quotes alone, unless it's a quoted nil
180 ((ps-macro-p op
) (values (ps-macroexpand (funcall (lookup-macro-expansion-function op
) form
)) t
))
181 (t (values form nil
))))
182 (cond ((ps-symbol-macro-p form
) (values (ps-macroexpand (funcall (lookup-macro-expansion-function form
))) t
))
183 (t (values form nil
)))))
185 ;;;; compiler interface
186 (defgeneric compile-parenscript-form
(form &key expecting
)
187 (:documentation
"Compiles a ParenScript form to the intermediate
188 ParenScript representation. :expecting determines whether the form is
189 compiled to an :expression (the default), a :statement, or a
192 (defmethod compile-parenscript-form :around
(form &key expecting
)
193 (assert (if expecting
(member expecting
'(:expression
:statement
:symbol
)) t
))
194 (if (eql expecting
:symbol
)
195 (compile-to-symbol form
)
196 (multiple-value-bind (expanded-form expanded-p
)
197 (ps-macroexpand form
)
199 (compile-parenscript-form expanded-form
:expecting expecting
)
200 (call-next-method)))))
202 (defun compile-to-symbol (form)
203 "Compiles the given Parenscript form and guarantees that the
204 resultant symbol has an associated script-package. Raises an error if
205 the form cannot be compiled to a symbol."
206 (let ((exp (compile-parenscript-form form
)))
207 (when (or (eql (first exp
) 'js-variable
)
208 (eql (first exp
) 'ps-quote
))
209 (setf exp
(second exp
)))
210 (assert (symbolp exp
) ()
211 "~a is expected to be a symbol, but compiles to ~a (the ParenScript output for ~a alone is \"~a\"). This could be due to ~a being a special form." form exp form
(ps* form
) form
)
214 (defmethod compile-parenscript-form (form &key expecting
)
215 (declare (ignore expecting
))
216 (error "The object ~S cannot be compiled by ParenScript." form
))
218 (defmethod compile-parenscript-form ((form number
) &key expecting
)
219 (declare (ignore expecting
))
222 (defmethod compile-parenscript-form ((form string
) &key expecting
)
223 (declare (ignore expecting
))
226 (defmethod compile-parenscript-form ((form character
) &key expecting
)
227 (declare (ignore expecting
))
228 (compile-parenscript-form (string form
)))
230 (defmethod compile-parenscript-form ((symbol symbol
) &key expecting
)
231 (declare (ignore expecting
))
232 (cond ((keywordp symbol
) symbol
)
233 ((ps-special-form-p (list symbol
))
234 (if (ps-literal-p symbol
)
235 (funcall (get-ps-special-form symbol
) :symbol
)
236 (error "Attempting to use Parenscript special form ~a as variable" symbol
)))
237 (t (list 'js-variable symbol
))))
239 (defun compile-function-argument-forms (arg-forms)
240 "Compiles a bunch of Parenscript forms from a funcall form to an effective set of
241 Javascript arguments. The only extra processing this does is makes :keyword arguments
242 into a single options argument via CREATE."
243 (let ((compiled-args (mapcar (lambda (arg) (compile-parenscript-form arg
:expecting
:expression
))
245 (do ((effective-expressions nil
)
246 (expressions-subl compiled-args
))
247 ((not expressions-subl
) (reverse effective-expressions
))
248 (let ((arg-expr (first expressions-subl
)))
249 (if (keywordp arg-expr
)
250 (progn (when (oddp (length expressions-subl
))
251 (error "Odd number of keyword arguments: ~A." arg-forms
))
252 (push (list 'js-object
(loop for
(name val
) on expressions-subl by
#'cddr
253 collect
(list (list 'js-variable name
) val
)))
254 effective-expressions
)
255 (setf expressions-subl nil
))
256 (progn (push arg-expr effective-expressions
)
257 (setf expressions-subl
(rest expressions-subl
))))))))
259 (defun ps-convert-op-name (op)
260 (case (ensure-ps-symbol op
)
268 (defmethod compile-parenscript-form ((form cons
) &key
(expecting :statement
))
269 (let* ((name (car form
))
271 (cond ((eql name
'quote
)
272 (assert (= 1 (length args
)) () "Wrong number of arguments to quote: ~s" args
)
273 (list 'ps-quote
(first args
)))
274 ((ps-special-form-p form
) (apply (get-ps-special-form name
) (cons expecting args
)))
277 (ps-convert-op-name (compile-parenscript-form (first form
) :expecting
:symbol
))
278 (mapcar (lambda (form) (compile-parenscript-form form
:expecting
:expression
)) (rest form
))))
279 ((method-call-p form
)
280 (list 'js-method-call
281 (compile-parenscript-form name
:expecting
:symbol
)
282 (compile-parenscript-form (first args
) :expecting
:expression
)
283 (compile-function-argument-forms (rest args
))))
284 ((funcall-form-p form
)
286 (compile-parenscript-form name
:expecting
:expression
)
287 (compile-function-argument-forms args
)))
288 (t (error "Cannot compile ~S to a ParenScript form." form
)))))
290 (defvar *ps-gensym-counter
* 0)
292 (defun ps-gensym (&optional
(prefix "_js"))
293 (make-symbol (format nil
"~A~A" prefix
(incf *ps-gensym-counter
*))))
295 (defmacro with-ps-gensyms
(symbols &body body
)
296 "Evaluate BODY with SYMBOLS bound to unique ParenScript identifiers.
298 Each element of SYMBOLS is either a symbol or a list of (symbol
299 gensym-prefix-string)."
300 `(let* ,(mapcar (lambda (symbol)
301 (destructuring-bind (symbol &optional prefix
)
306 `(,symbol
(ps-gensym ,prefix
))
307 `(,symbol
(ps-gensym ,(symbol-to-js-string symbol
))))))
311 (defun %check-once-only-vars
(vars)
312 (let ((bad-var (find-if (lambda (x) (or (not (symbolp x
)) (keywordp x
))) vars
)))
314 (error "PS-ONLY-ONCE expected a non-keyword symbol but got ~s" bad-var
))))
316 (defmacro ps-once-only
((&rest vars
) &body body
)
317 (%check-once-only-vars vars
)
318 (let ((gensyms (mapcar (lambda (x) (ps-gensym (string x
))) vars
)))
319 `(let ,(mapcar (lambda (g v
) `(,g
(ps-gensym ,(string v
)))) gensyms vars
)
320 `(let* (,,@(mapcar (lambda (g v
) ``(,,g
,,v
)) gensyms vars
))
321 ,(let ,(mapcar (lambda (g v
) `(,v
,g
)) gensyms vars
)