(define-compilation progn (&rest body)
(js!selfcall (ls-compile-block body t)))
-(defun dynamic-binding-wrapper (bindings body)
- (if (null bindings)
- body
- (concat
- "try {" *newline*
- (indent
- "var tmp;" *newline*
- (join
- (mapcar (lambda (b)
- (let ((s (ls-compile `(quote ,(car b)))))
- (concat "tmp = " s ".value;" *newline*
- s ".value = " (cdr b) ";" *newline*
- (cdr b) " = tmp;" *newline*)))
- bindings))
- body)
- "}" *newline*
- "finally {" *newline*
- (indent
- (join-trailing
- (mapcar (lambda (b)
- (let ((s (ls-compile `(quote ,(car b)))))
- (concat s ".value" " = " (cdr b))))
- bindings)
- (concat ";" *newline*)))
- "}" *newline*)))
-
+(defun special-variable-p (x)
+ (claimp x 'variable 'special))
+
+;;; Wrap CODE to restore the symbol values of the dynamic
+;;; bindings. BINDINGS is a list of pairs of the form
+;;; (SYMBOL . PLACE), where PLACE is a Javascript variable
+;;; name to initialize the symbol value and where to stored
+;;; the old value.
+(defun let-binding-wrapper (bindings body)
+ (when (null bindings)
+ (return-from let-binding-wrapper body))
+ (concat
+ "try {" *newline*
+ (indent "var tmp;" *newline*
+ (mapconcat
+ (lambda (b)
+ (let ((s (ls-compile `(quote ,(car b)))))
+ (concat "tmp = " s ".value;" *newline*
+ s ".value = " (cdr b) ";" *newline*
+ (cdr b) " = tmp;" *newline*)))
+ bindings)
+ body *newline*)
+ "}" *newline*
+ "finally {" *newline*
+ (indent
+ (mapconcat (lambda (b)
+ (let ((s (ls-compile `(quote ,(car b)))))
+ (concat s ".value" " = " (cdr b) ";" *newline*)))
+ bindings))
+ "}" *newline*))
(define-compilation let (bindings &rest body)
(let ((bindings (mapcar #'ensure-list bindings)))
- (let ((variables (mapcar #'first bindings))
- (values (mapcar #'second bindings)))
- (let ((cvalues (mapcar #'ls-compile values))
- (*environment*
- (extend-local-env (remove-if (lambda (v)(claimp v 'variable 'special))
- variables)))
+ (let ((variables (mapcar #'first bindings)))
+ (let ((cvalues (mapcar #'ls-compile (mapcar #'second bindings)))
+ (*environment* (extend-local-env (remove-if #'special-variable-p variables)))
(dynamic-bindings))
(concat "(function("
(join (mapcar (lambda (x)
- (if (claimp x 'variable 'special)
+ (if (special-variable-p x)
(let ((v (gvarname x)))
(push (cons x v) dynamic-bindings)
v)
",")
"){" *newline*
(let ((body (ls-compile-block body t)))
- (indent (dynamic-binding-wrapper dynamic-bindings body)))
+ (indent (let-binding-wrapper dynamic-bindings body)))
"})(" (join cvalues ",") ")")))))
+;;; Return the code to initialize BINDING, and push it extending the
+;;; current lexical environment if the variable is special.
+(defun let*-initialize-value (binding)
+ (let ((var (first binding))
+ (value (second binding)))
+ (if (special-variable-p var)
+ (concat (ls-compile `(setq ,var ,value)) ";" *newline*)
+ (let ((v (gvarname var)))
+ (let ((b (make-binding var 'variable v)))
+ (prog1 (concat "var " v " = " (ls-compile value) ";" *newline*)
+ (push-to-lexenv b *environment* 'variable)))))))
+
+;;; Wrap BODY to restore the symbol values of SYMBOLS after body. It
+;;; DOES NOT generate code to initialize the value of the symbols,
+;;; unlike let-binding-wrapper.
+(defun let*-binding-wrapper (symbols body)
+ (when (null symbols)
+ (return-from let*-binding-wrapper body))
+ (let ((store (mapcar (lambda (s) (cons s (gvarname s)))
+ (remove-if-not #'special-variable-p symbols))))
+ (concat
+ "try {" *newline*
+ (indent
+ (mapconcat (lambda (b)
+ (let ((s (ls-compile `(quote ,(car b)))))
+ (concat "var " (cdr b) " = " s ".value;" *newline*)))
+ store)
+ body)
+ "}" *newline*
+ "finally {" *newline*
+ (indent
+ (mapconcat (lambda (b)
+ (let ((s (ls-compile `(quote ,(car b)))))
+ (concat s ".value" " = " (cdr b) ";" *newline*)))
+ store))
+ "}" *newline*)))
+
+
+(define-compilation let* (bindings &rest body)
+ (let ((bindings (mapcar #'ensure-list bindings))
+ (*environment* (copy-lexenv *environment*)))
+ (js!selfcall
+ (let ((specials (remove-if-not #'special-variable-p (mapcar #'first bindings)))
+ (body (concat (mapconcat #'let*-initialize-value bindings)
+ (ls-compile-block body t))))
+ (let*-binding-wrapper specials body)))))
+
+
(defvar *block-counter* 0)
(define-compilation block (name &rest body)
((symbolp sexp)
(let ((b (lookup-in-lexenv sexp *environment* 'variable)))
(cond
- ((eq (binding-type b) 'lexical-variable)
+ ((and b (not (member 'special (binding-declarations b))))
(binding-value b))
- ((or (keywordp sexp) (claimp sexp 'variable 'constant))
+ ((or (keywordp sexp)
+ (member 'constant (binding-declarations b)))
(concat (ls-compile `',sexp) ".value"))
(t
(ls-compile `(symbol-value ',sexp))))))
(ls-compile-toplevel x))))
(js-eval code)))
- (export '(* *gensym-counter* *package* + - / 1+ 1- < <= = = > >= and append
- apply assoc atom block boundp boundp butlast caar cadddr
- caddr cadr car car case catch cdar cdddr cddr cdr cdr char
- char-code char= code-char cond cons consp copy-list decf
- declaim defparameter defun defvar digit-char-p disassemble
- documentation dolist dotimes ecase eq eql equal error eval
- every export fdefinition find-package find-symbol first
- fourth fset funcall function functionp gensym go identity
- in-package incf integerp integerp intern keywordp
- lambda-code last length let list-all-packages list listp
- make-package make-symbol mapcar member minusp mod nil not
- nth nthcdr null numberp or package-name package-use-list
- packagep plusp prin1-to-string print proclaim prog1 prog2
- pron push quote remove remove-if remove-if-not return
- return-from revappend reverse second set setq some
- string-upcase string string= stringp subseq
- symbol-function symbol-name symbol-package symbol-plist
- symbol-value symbolp t tagbody third throw truncate unless
- unwind-protect variable warn when write-line write-string
- zerop))
+ (export '(&rest &optional &body * *gensym-counter* *package* + - / 1+ 1- < <= =
+= > >= and append apply assoc atom block boundp boundp butlast caar
+cadddr caddr cadr car car case catch cdar cdddr cddr cdr cdr char
+char-code char= code-char cond cons consp copy-list decf declaim
+defparameter defun defvar digit-char-p disassemble documentation
+dolist dotimes ecase eq eql equal error eval every export fdefinition
+find-package find-symbol first fourth fset funcall function functionp
+gensym go identity if in-package incf integerp integerp intern
+keywordp lambda last length let let* list-all-packages list listp
+make-package make-symbol mapcar member minusp mod nil not nth nthcdr
+null numberp or package-name package-use-list packagep plusp
+prin1-to-string print proclaim prog1 prog2 pron push quote remove
+remove-if remove-if-not return return-from revappend reverse second
+set setq some string-upcase string string= stringp subseq
+symbol-function symbol-name symbol-package symbol-plist symbol-value
+symbolp t tagbody third throw truncate unless unwind-protect variable
+warn when write-line write-string zerop))
(setq *package* *user-package*)
projects / jscl.git / blobdiff