Commit | Line | Data |
---|---|---|
e8fdcce7 | 1 | (in-package "PARENSCRIPT") |
cc4f1551 | 2 | |
72044f33 | 3 | ;;; reserved symbols/literals |
c88be949 | 4 | |
72044f33 | 5 | (defvar *ps-reserved-symbol-names* ()) ;; symbol names reserved for PS/JS literals |
c88be949 | 6 | |
72044f33 VS |
7 | (defun add-ps-literal (name) |
8 | (push (symbol-name name) *ps-reserved-symbol-names*)) | |
c88be949 | 9 | |
72044f33 VS |
10 | (defun ps-literal-p (symbol) |
11 | (find (symbol-name symbol) *ps-reserved-symbol-names* :test #'equalp)) | |
8cf7de80 | 12 | |
72044f33 | 13 | ;;; special forms |
f326f929 | 14 | |
72044f33 | 15 | (defvar *ps-special-forms* (make-hash-table :test 'eq)) |
4577df1c | 16 | |
72044f33 VS |
17 | (defun get-ps-special-form (name) |
18 | (gethash name *ps-special-forms*)) | |
cc4f1551 | 19 | |
4a987e2b | 20 | (defmacro define-ps-special-form (name lambda-list &rest body) |
e8fdcce7 VS |
21 | "Define a special form NAME. The first argument (an anaphor called |
22 | 'expecting' automatically added to the arglist) to the special form is | |
23 | a keyword indicating whether the form is expected to produce | |
24 | an :expression or a :statement." | |
a8b6752e | 25 | (let ((args (gensym "ps-arglist-"))) |
72044f33 | 26 | `(setf (gethash ',name *ps-special-forms*) |
e8fdcce7 VS |
27 | (lambda (&rest ,args) |
28 | (destructuring-bind ,(cons 'expecting lambda-list) | |
29 | ,args | |
a8b6752e | 30 | (declare (ignorable expecting)) |
c88be949 | 31 | ,@body))))) |
9da682ca | 32 | |
72044f33 VS |
33 | (defun undefine-ps-special-form (name) |
34 | (remhash name *ps-special-forms*)) | |
35 | ||
36 | (defun ps-special-form-p (form) | |
37 | (and (consp form) | |
38 | (symbolp (car form)) | |
39 | (gethash (car form) *ps-special-forms*))) | |
40 | ||
41 | ;;; scoping | |
42 | ||
e0032a96 VS |
43 | (defvar *enclosing-lexical-block-declarations* () |
44 | "This special variable is expected to be bound to a fresh list by | |
45 | special forms that introduce a new JavaScript lexical block (currently | |
46 | function definitions and lambdas). Enclosed special forms are expected | |
47 | to push variable declarations onto the list when the variables | |
83b5a0cc TC |
48 | declaration cannot be made by the enclosed form \(for example, a |
49 | \(x,y,z\) expression progn\). It is then the responsibility of the | |
e0032a96 VS |
50 | enclosing special form to introduce the variable bindings in its |
51 | lexical block.") | |
52 | ||
58c4ef4f VS |
53 | (defvar *ps-special-variables* ()) |
54 | ||
72044f33 | 55 | ;;; form predicates |
4a987e2b VS |
56 | |
57 | (defun op-form-p (form) | |
58 | (and (listp form) | |
59 | (not (ps-special-form-p form)) | |
60 | (not (null (op-precedence (first form)))))) | |
cc4f1551 | 61 | |
9da682ca RD |
62 | (defun funcall-form-p (form) |
63 | (and (listp form) | |
4a987e2b VS |
64 | (not (op-form-p form)) |
65 | (not (ps-special-form-p form)))) | |
cc4f1551 | 66 | |
9da682ca | 67 | ;;; macro expansion |
cc4f1551 RD |
68 | (eval-when (:compile-toplevel :load-toplevel :execute) |
69 | (defun make-macro-env-dictionary () | |
72044f33 | 70 | (make-hash-table :test 'eq)) |
462ca010 | 71 | (defvar *ps-macro-toplevel* (make-macro-env-dictionary) |
72044f33 VS |
72 | "Toplevel macro environment dictionary. Key is the symbol name of |
73 | the macro, value is (symbol-macro-p . expansion-function).") | |
462ca010 | 74 | (defvar *ps-macro-env* (list *ps-macro-toplevel*) |
171bbab3 | 75 | "Current macro environment.") |
72332f2a | 76 | |
462ca010 | 77 | (defvar *ps-setf-expanders* (make-macro-env-dictionary) |
72332f2a VS |
78 | "Setf expander dictionary. Key is the symbol of the access |
79 | function of the place, value is an expansion function that takes the | |
80 | arguments of the access functions as a first value and the form to be | |
81 | stored as the second value.") | |
171bbab3 | 82 | |
06babcf5 VS |
83 | (defun get-macro-spec (name env-dict) |
84 | "Retrieves the macro spec of the given name with the given environment dictionary. | |
72332f2a | 85 | SPEC is of the form (symbol-macro-p . expansion-function)." |
72044f33 | 86 | (gethash name env-dict)) |
06babcf5 VS |
87 | (defsetf get-macro-spec (name env-dict) |
88 | (spec) | |
72044f33 | 89 | `(setf (gethash ,name ,env-dict) ,spec))) |
9da682ca | 90 | |
462ca010 | 91 | (defun lookup-macro-spec (name &optional (environment *ps-macro-env*)) |
9da682ca | 92 | "Looks up the macro spec associated with NAME in the given environment. A |
905f534e | 93 | macro spec is of the form (symbol-macro-p . function). Returns two values: |
9da682ca | 94 | the SPEC and the parent macro environment. |
cc4f1551 | 95 | |
9da682ca | 96 | NAME must be a symbol." |
cc4f1551 RD |
97 | (when (symbolp name) |
98 | (do ((env environment (cdr env))) | |
99 | ((null env) nil) | |
100 | (let ((val (get-macro-spec name (car env)))) | |
101 | (when val | |
102 | (return-from lookup-macro-spec | |
103 | (values val (or (cdr env) | |
462ca010 | 104 | (list *ps-macro-toplevel*))))))))) |
cc4f1551 | 105 | |
462ca010 | 106 | (defun ps-symbol-macro-p (name &optional (environment *ps-macro-env*)) |
9da682ca | 107 | "True if there is a Parenscript symbol macro named by the symbol NAME." |
cc4f1551 RD |
108 | (and (symbolp name) (car (lookup-macro-spec name environment)))) |
109 | ||
462ca010 | 110 | (defun ps-macro-p (name &optional (environment *ps-macro-env*)) |
9da682ca RD |
111 | "True if there is a Parenscript macro named by the symbol NAME." |
112 | (and (symbolp name) | |
113 | (let ((macro-spec (lookup-macro-spec name environment))) | |
b508414b | 114 | (and macro-spec (not (car macro-spec)))))) |
cc4f1551 | 115 | |
462ca010 | 116 | (defun lookup-macro-expansion-function (name &optional (environment *ps-macro-env*)) |
cc4f1551 RD |
117 | "Lookup NAME in the given macro expansion environment (which |
118 | defaults to the current macro environment). Returns the expansion | |
119 | function and the parent macro environment of the macro." | |
120 | (multiple-value-bind (macro-spec parent-env) | |
121 | (lookup-macro-spec name environment) | |
122 | (values (cdr macro-spec) parent-env))) | |
123 | ||
8cfc6fe9 VS |
124 | (defun make-ps-macro-function (args body) |
125 | (let* ((whole-var (when (eql '&whole (first args)) (second args))) | |
126 | (effective-lambda-list (if whole-var (cddr args) args)) | |
127 | (whole-arg (or whole-var (gensym "ps-macro-form-arg-")))) | |
128 | `(lambda (,whole-arg) | |
129 | (destructuring-bind ,effective-lambda-list | |
130 | (cdr ,whole-arg) | |
131 | ,@body)))) | |
d9fc64c9 | 132 | |
4a987e2b | 133 | (defmacro defpsmacro (name args &body body) |
8cfc6fe9 VS |
134 | `(progn (undefine-ps-special-form ',name) |
135 | (setf (get-macro-spec ',name *ps-macro-toplevel*) | |
136 | (cons nil ,(make-ps-macro-function args body))) | |
137 | ',name)) | |
cc4f1551 | 138 | |
8cfc6fe9 | 139 | (defmacro define-ps-symbol-macro (symbol expansion) |
fb469285 VS |
140 | (let ((x (gensym))) |
141 | `(progn (undefine-ps-special-form ',symbol) | |
142 | (setf (get-macro-spec ',symbol *ps-macro-toplevel*) (cons t (lambda (,x) (declare (ignore ,x)) ',expansion))) | |
143 | ',symbol))) | |
b5369cb1 | 144 | |
7590646c VS |
145 | (defun import-macros-from-lisp (&rest names) |
146 | "Import the named Lisp macros into the ParenScript macro | |
147 | environment. When the imported macro is macroexpanded by ParenScript, | |
148 | it is first fully macroexpanded in the Lisp macro environment, and | |
149 | then that expansion is further expanded by ParenScript." | |
150 | (dolist (name names) | |
8cfc6fe9 VS |
151 | (eval `(defpsmacro ,name (&rest args) |
152 | (macroexpand `(,',name ,@args)))))) | |
7590646c | 153 | |
f016e033 | 154 | (defmacro defmacro/ps (name args &body body) |
7590646c VS |
155 | "Define a Lisp macro and import it into the ParenScript macro environment." |
156 | `(progn (defmacro ,name ,args ,@body) | |
8cfc6fe9 | 157 | (import-macros-from-lisp ',name))) |
7590646c | 158 | |
f016e033 | 159 | (defmacro defmacro+ps (name args &body body) |
8cfc6fe9 VS |
160 | "Define a Lisp macro and a ParenScript macro with the same macro |
161 | function (ie - the same result from macroexpand-1), for cases when the | |
162 | two have different full macroexpansions (for example if the CL macro | |
163 | contains implementation-specific code when macroexpanded fully in the | |
164 | CL environment)." | |
7590646c | 165 | `(progn (defmacro ,name ,args ,@body) |
4a987e2b VS |
166 | (defpsmacro ,name ,args ,@body))) |
167 | ||
168 | (defun ps-macroexpand (form) | |
169 | "Recursively macroexpands ParenScript macros and symbol-macros in | |
170 | the given ParenScript form. Returns two values: the expanded form, and | |
171 | whether any expansion was performed on the form or not." | |
fb469285 VS |
172 | (let ((macro-function (cond ((ps-symbol-macro-p form) form) |
173 | ((and (consp form) (ps-macro-p (car form))) (car form))))) | |
174 | (if macro-function | |
175 | (values (ps-macroexpand (funcall (lookup-macro-expansion-function macro-function) form)) t) | |
176 | (values form nil)))) | |
4a987e2b VS |
177 | |
178 | ;;;; compiler interface | |
179 | (defgeneric compile-parenscript-form (form &key expecting) | |
180 | (:documentation "Compiles a ParenScript form to the intermediate | |
181 | ParenScript representation. :expecting determines whether the form is | |
182 | compiled to an :expression (the default), a :statement, or a | |
183 | :symbol.")) | |
184 | ||
185 | (defmethod compile-parenscript-form :around (form &key expecting) | |
e0032a96 | 186 | (assert (if expecting (member expecting '(:expression :statement :symbol)) t)) |
4a987e2b VS |
187 | (if (eql expecting :symbol) |
188 | (compile-to-symbol form) | |
189 | (multiple-value-bind (expanded-form expanded-p) | |
190 | (ps-macroexpand form) | |
191 | (if expanded-p | |
a589bb43 | 192 | (compile-parenscript-form expanded-form :expecting expecting) |
4a987e2b VS |
193 | (call-next-method))))) |
194 | ||
195 | (defun compile-to-symbol (form) | |
196 | "Compiles the given Parenscript form and guarantees that the | |
197 | resultant symbol has an associated script-package. Raises an error if | |
198 | the form cannot be compiled to a symbol." | |
199 | (let ((exp (compile-parenscript-form form))) | |
0ce67a33 | 200 | (when (eq (first exp) 'js:variable) |
4a987e2b VS |
201 | (setf exp (second exp))) |
202 | (assert (symbolp exp) () | |
203 | "~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) | |
204 | exp)) | |
205 | ||
206 | (defmethod compile-parenscript-form (form &key expecting) | |
207 | (declare (ignore expecting)) | |
208 | (error "The object ~S cannot be compiled by ParenScript." form)) | |
209 | ||
210 | (defmethod compile-parenscript-form ((form number) &key expecting) | |
211 | (declare (ignore expecting)) | |
212 | form) | |
213 | ||
214 | (defmethod compile-parenscript-form ((form string) &key expecting) | |
215 | (declare (ignore expecting)) | |
216 | form) | |
217 | ||
218 | (defmethod compile-parenscript-form ((form character) &key expecting) | |
219 | (declare (ignore expecting)) | |
220 | (compile-parenscript-form (string form))) | |
221 | ||
222 | (defmethod compile-parenscript-form ((symbol symbol) &key expecting) | |
223 | (declare (ignore expecting)) | |
f2bb932e VS |
224 | (cond ((keywordp symbol) symbol) |
225 | ((ps-special-form-p (list symbol)) | |
f326f929 VS |
226 | (if (ps-literal-p symbol) |
227 | (funcall (get-ps-special-form symbol) :symbol) | |
228 | (error "Attempting to use Parenscript special form ~a as variable" symbol))) | |
0ce67a33 | 229 | (t `(js:variable ,symbol)))) |
4a987e2b | 230 | |
3b16a7f3 TC |
231 | (defun ps-convert-op-name (op) |
232 | (case (ensure-ps-symbol op) | |
233 | (and '\&\&) | |
234 | (or '\|\|) | |
235 | (not '!) | |
236 | (eql '\=\=) | |
237 | (= '\=\=) | |
238 | (t op))) | |
239 | ||
4a987e2b | 240 | (defmethod compile-parenscript-form ((form cons) &key (expecting :statement)) |
46f794a4 | 241 | (let* ((name (car form)) |
b508414b | 242 | (args (cdr form))) |
fb469285 | 243 | (cond ((ps-special-form-p form) (apply (get-ps-special-form name) (cons expecting args))) |
4a987e2b | 244 | ((op-form-p form) |
0ce67a33 VS |
245 | `(js:operator |
246 | ,(ps-convert-op-name (compile-parenscript-form (first form) :expecting :symbol)) | |
247 | ,@(mapcar (lambda (form) (compile-parenscript-form form :expecting :expression)) (rest form)))) | |
4a987e2b | 248 | ((funcall-form-p form) |
0ce67a33 VS |
249 | `(js:funcall ,(compile-parenscript-form name :expecting :expression) |
250 | ,@(mapcar (lambda (arg) (compile-parenscript-form arg :expecting :expression)) args))) | |
4a987e2b | 251 | (t (error "Cannot compile ~S to a ParenScript form." form))))) |
cc4f1551 | 252 | |
18dd299a VS |
253 | (defvar *ps-gensym-counter* 0) |
254 | ||
255 | (defun ps-gensym (&optional (prefix "_js")) | |
256 | (make-symbol (format nil "~A~A" prefix (incf *ps-gensym-counter*)))) | |
257 | ||
258 | (defmacro with-ps-gensyms (symbols &body body) | |
259 | "Evaluate BODY with SYMBOLS bound to unique ParenScript identifiers. | |
260 | ||
261 | Each element of SYMBOLS is either a symbol or a list of (symbol | |
262 | gensym-prefix-string)." | |
263 | `(let* ,(mapcar (lambda (symbol) | |
264 | (destructuring-bind (symbol &optional prefix) | |
265 | (if (consp symbol) | |
266 | symbol | |
267 | (list symbol)) | |
268 | (if prefix | |
269 | `(,symbol (ps-gensym ,prefix)) | |
6274a448 | 270 | `(,symbol (ps-gensym ,(symbol-to-js-string symbol)))))) |
18dd299a VS |
271 | symbols) |
272 | ,@body)) | |
6ae06336 TC |
273 | |
274 | (defun %check-once-only-vars (vars) | |
275 | (let ((bad-var (find-if (lambda (x) (or (not (symbolp x)) (keywordp x))) vars))) | |
276 | (when bad-var | |
277 | (error "PS-ONLY-ONCE expected a non-keyword symbol but got ~s" bad-var)))) | |
278 | ||
279 | (defmacro ps-once-only ((&rest vars) &body body) | |
280 | (%check-once-only-vars vars) | |
281 | (let ((gensyms (mapcar (lambda (x) (ps-gensym (string x))) vars))) | |
282 | `(let ,(mapcar (lambda (g v) `(,g (ps-gensym ,(string v)))) gensyms vars) | |
283 | `(let* (,,@(mapcar (lambda (g v) ``(,,g ,,v)) gensyms vars)) | |
284 | ,(let ,(mapcar (lambda (g v) `(,v ,g)) gensyms vars) | |
285 | ,@body))))) |