1 (in-package "PARENSCRIPT")
3 ;;; Handy utilities for doing common tasks found in many web browser
4 ;;; JavaScript implementations
6 (defpsmacro do-set-timeout
((timeout) &body body
)
7 `(set-timeout (lambda () ,@body
) ,timeout
))
11 (defmacro def-js-maths
(&rest mathdefs
)
12 `(progn ,@(mapcar (lambda (def) (cons 'defpsmacro def
)) mathdefs
)))
15 (max (&rest nums
) `((@ *math max
) ,@nums
))
16 (min (&rest nums
) `((@ *math min
) ,@nums
))
17 (floor (n &optional divisor
) `((@ *math floor
) ,(if divisor
`(/ ,n
,divisor
) n
)))
18 (ceiling (n &optional divisor
) `((@ *math ceil
) ,(if divisor
`(/ ,n
,divisor
) n
)))
19 (round (n &optional divisor
) `((@ *math round
) ,(if divisor
`(/ ,n
,divisor
) n
)))
20 (sin (n) `((@ *math sin
) ,n
))
21 (cos (n) `((@ *math cos
) ,n
))
22 (tan (n) `((@ *math tan
) ,n
))
23 (asin (n) `((@ *math asin
) ,n
))
24 (acos (n) `((@ *math acos
) ,n
))
25 (atan (y &optional x
) (if x
`((@ *math atan2
) ,y
,x
) `((@ *math atan
) ,y
)))
26 (sinh (n) `((lambda (x) (return (/ (- (exp x
) (exp (- x
))) 2))) ,n
))
27 (cosh (n) `((lambda (x) (return (/ (+ (exp x
) (exp (- x
))) 2))) ,n
))
28 (tanh (n) `((lambda (x) (return (/ (- (exp x
) (exp (- x
))) (+ (exp x
) (exp (- x
)))))) ,n
))
29 (asinh (n) `((lambda (x) (return (log (+ x
(sqrt (1+ (* x x
))))))) ,n
))
30 (acosh (n) `((lambda (x) (return (* 2 (log (+ (sqrt (/ (1+ x
) 2)) (sqrt (/ (1- x
) 2))))))) ,n
))
31 (atanh (n) `((lambda (x) (return (/ (- (log (+ 1 x
)) (log (- 1 x
))) 2))) ,n
))
34 (abs (n) `((@ *math abs
) ,n
))
35 (evenp (n) `(not (oddp ,n
)))
37 (exp (n) `((@ *math exp
) ,n
))
38 (expt (base power
) `((@ *math pow
) ,base
,power
))
39 (log (n &optional base
)
40 (or (and (null base
) `((@ *math log
) ,n
))
41 (and (numberp base
) (= base
10) `(* (log ,n
) (@ *math
*log10e
*)))
42 `(/ (log ,n
) (log ,base
))))
43 (sqrt (n) `((@ *math sqrt
) ,n
))
44 (random (&optional upto
) (if upto
45 `(floor (* ,upto
((@ *math random
))))
46 '((@ *math random
)))))
48 (define-ps-symbol-macro pi
(@ *math
*pi
*))
50 ;;; Exception handling
52 (defpsmacro ignore-errors
(&body body
)
53 `(try (progn ,@body
) (:catch
(e))))
57 (defpsmacro [] (&rest args
)
58 `(array ,@(mapcar (lambda (arg)
59 (if (and (consp arg
) (not (equal '[] (car arg
))))
64 (defpsmacro length
(a)
72 (defpsmacro undefined
(x)
75 (defpsmacro defined
(x)
76 `(not (undefined ,x
)))
78 (defpsmacro @ (obj &rest props
)
79 "Handy slot-value/aref composition macro."
81 `(@ (slot-value ,obj
,(if (symbolp (car props
)) `',(car props
) (car props
))) ,@(cdr props
))
84 (defpsmacro chain
(&rest method-calls
)
85 (labels ((do-chain (method-calls)
86 (if (cdr method-calls
)
87 `((@ ,(do-chain (cdr method-calls
)) ,(caar method-calls
)) ,@(cdar method-calls
))
89 (do-chain (reverse method-calls
))))
92 (defpsmacro concatenate
(result-type &rest sequences
)
93 (assert (equal result-type
''string
) () "Right now Parenscript 'concatenate' only support strings.")
96 (defmacro concat-string
(&rest things
)
97 "Like concatenate but prints all of its arguments."
98 `(format nil
"~@{~A~}" ,@things
))
100 (defpsmacro concat-string
(&rest things
)
103 (defpsmacro elt
(array index
)
104 `(aref ,array
,index
))
106 (defpsmacro with-lambda
(() &body body
)
107 "Wraps BODY in a lambda so that it can be treated as an expression."
108 `((lambda () ,@body
)))
110 (defpsmacro stringp
(x)
111 `(= (typeof ,x
) "string"))
113 (defpsmacro numberp
(x)
114 `(= (typeof ,x
) "number"))
116 (defpsmacro functionp
(x)
117 `(= (typeof ,x
) "function"))
119 (defpsmacro objectp
(x)
120 `(= (typeof ,x
) "object"))
122 (defpsmacro memoize
(fn-expr)
123 (destructuring-bind (defun fn-name (arg) &rest fn-body
)
125 (declare (ignore defun
))
126 (with-ps-gensyms (table value compute-fn
)
128 (defun ,compute-fn
(,arg
) ,@fn-body
)
129 (defun ,fn-name
(,arg
)
130 (let ((,value
(aref ,table
,arg
)))
132 (setf ,value
(,compute-fn
,arg
))
133 (setf (aref ,table
,arg
) ,value
))
134 (return ,value
)))))))
136 (defpsmacro append
(arr1 &rest arrs
)
138 `((@ ,arr1 concat
) ,@arrs
)
141 (defpsmacro apply
(fn &rest args
)
142 (let ((arglist (if (> (length args
) 1)
143 `(append (list ,@(butlast args
)) ,(car (last args
)))
145 `((@ ,fn apply
) this
,arglist
)))
147 (defun destructuring-wrap (arr n bindings body
)
148 (cond ((null bindings
)
151 ;; dotted destructuring list
152 `(let ((,bindings
(when (> (length ,arr
) ,n
)
153 ((@ ,arr slice
) ,n
))))
155 (t (let ((var (car bindings
))
156 (inner-body (destructuring-wrap arr
(1+ n
) (cdr bindings
) body
)))
157 (cond ((null var
) inner-body
)
158 ((atom var
) `(let ((,var
(aref ,arr
,n
)))
160 (t `(destructuring-bind ,var
(aref ,arr
,n
)
163 (defpsmacro destructuring-bind
(bindings expr
&body body
)
164 (let* ((arr (if (complex-js-expr? expr
) (ps-gensym) expr
))
165 (bound (destructuring-wrap arr
0 bindings
(cons 'progn body
))))
168 `(let ((,arr
,expr
)) ,bound
))))