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moving delete-duplicates and new f-body so they can be macroexpanded in advance 

deprecating setf, labels, and try (weren't used anywhere)
adding string.tail
changing match to use delete-duplicates
This commit is contained in:
JeffBezanson 2009-02-19 22:29:47 +00:00
parent 0c0471e856
commit f1927a3b57
3 changed files with 144 additions and 147 deletions
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9
femtolisp/ast/match.scm
View File

@ -1,13 +1,6 @@
; tree regular expression pattern matching
; by Jeff Bezanson
(define (unique lst)
(if (null? lst)
()
(cons (car lst)
(filter (lambda (x) (not (eq? x (car lst))))
(unique (cdr lst))))))
; list of special pattern symbols that cannot be variable names
(define metasymbols '(_ ...))
@ -141,7 +134,7 @@
((pair? p)
(if (eq? (car p) '-/)
()
(unique (apply append (map patargs- (cdr p))))))
(delete-duplicates (apply append (map patargs- (cdr p))))))
(else ())))
(cons '__ (patargs- p)))

100
femtolisp/attic/scrap.lsp Normal file
View File

@ -0,0 +1,100 @@
; -*- scheme -*-
; (try expr
; (catch (type-error e) . exprs)
; (catch (io-error e) . exprs)
; (catch (e) . exprs)
; (finally . exprs))
(define-macro (try expr . forms)
(let* ((e (gensym))
(reraised (gensym))
(final (f-body (cdr (or (assq 'finally forms) '(())))))
(catches (filter (lambda (f) (eq (car f) 'catch)) forms))
(catchblock `(cond
,.(map (lambda (catc)
(let* ((specific (cdr (cadr catc)))
(extype (caadr catc))
(var (if specific (car specific)
extype))
(todo (cddr catc)))
`(,(if specific
; exception matching logic
`(or (eq ,e ',extype)
(and (pair? ,e)
(eq (car ,e)
',extype)))
#t); (catch (e) ...), match anything
(let ((,var ,e)) (begin ,@todo)))))
catches)
(#t (raise ,e))))) ; no matches, reraise
(if final
(if catches
; form with both catch and finally
`(prog1 (trycatch ,expr
(lambda (,e)
(trycatch ,catchblock
(lambda (,reraised)
(begin ,final
(raise ,reraised))))))
,final)
; finally only; same as unwind-protect
`(prog1 (trycatch ,expr (lambda (,e)
(begin ,final (raise ,e))))
,final))
; catch, no finally
`(trycatch ,expr (lambda (,e) ,catchblock)))))
; setf
; expands (setf (place x ...) v) to (mutator (f x ...) v)
; (mutator (identity x ...) v) is interpreted as (mutator x ... v)
(set! *setf-place-list*
; place mutator f
'((car rplaca identity)
(cdr rplacd identity)
(caar rplaca car)
(cadr rplaca cdr)
(cdar rplacd car)
(cddr rplacd cdr)
(caaar rplaca caar)
(caadr rplaca cadr)
(cadar rplaca cdar)
(caddr rplaca cddr)
(cdaar rplacd caar)
(cdadr rplacd cadr)
(cddar rplacd cdar)
(cdddr rplacd cddr)
(list-ref rplaca nthcdr)
(get put! identity)
(aref aset! identity)
(symbol-syntax set-syntax! identity)))
(define (setf-place-mutator place val)
(if (symbol? place)
(list 'set! place val)
(let ((mutator (assq (car place) *setf-place-list*)))
(if (null? mutator)
(error "setf: unknown place " (car place))
(if (eq (caddr mutator) 'identity)
(cons (cadr mutator) (append (cdr place) (list val)))
(list (cadr mutator)
(cons (caddr mutator) (cdr place))
val))))))
(define-macro (setf . args)
(f-body
((label setf-
(lambda (args)
(if (null? args)
()
(cons (setf-place-mutator (car args) (cadr args))
(setf- (cddr args))))))
args)))
(define-macro (labels binds . body)
(cons (list 'lambda (map car binds)
(f-body
(nconc (map (lambda (b)
(list 'set! (car b) (cons 'lambda (cdr b))))
binds)
body)))
(map (lambda (x) #f) binds)))

182
femtolisp/system.lsp
View File

@ -101,43 +101,6 @@
((eqv (caar lst) item) (car lst))
(#t (assv item (cdr lst)))))
(define (delete-duplicates lst)
(if (atom? lst)
lst
(let ((elt (car lst))
(tail (cdr lst)))
(if (member elt tail)
(delete-duplicates tail)
(cons elt
(delete-duplicates tail))))))
(define (get-defined-vars- expr)
(cond ((atom? expr) ())
((and (eq? (car expr) 'define)
(pair? (cdr expr)))
(or (and (symbol? (cadr expr))
(list (cadr expr)))
(and (pair? (cadr expr))
(symbol? (caadr expr))
(list (caadr expr)))
()))
((eq? (car expr) 'begin)
(apply append (map get-defined-vars- (cdr expr))))
(else ())))
(define (get-defined-vars expr)
(delete-duplicates (get-defined-vars- expr)))
; redefine f-body to support internal defines
(define f-body- f-body)
(define (f-body e)
((lambda (B)
((lambda (V)
(if (null? V)
B
(cons (list 'lambda V B) (map (lambda (x) #f) V))))
(get-defined-vars B)))
(f-body- e)))
(define (macrocall? e) (and (symbol? (car e))
(symbol-syntax (car e))))
@ -196,6 +159,43 @@
(macroexpand (list 'lambda (cdr form) (f-body body)))))
(define macroexpand (macroexpand macroexpand))
(define (delete-duplicates lst)
(if (atom? lst)
lst
(let ((elt (car lst))
(tail (cdr lst)))
(if (member elt tail)
(delete-duplicates tail)
(cons elt
(delete-duplicates tail))))))
(define (get-defined-vars- expr)
(cond ((atom? expr) ())
((and (eq? (car expr) 'define)
(pair? (cdr expr)))
(or (and (symbol? (cadr expr))
(list (cadr expr)))
(and (pair? (cadr expr))
(symbol? (caadr expr))
(list (caadr expr)))
()))
((eq? (car expr) 'begin)
(apply append (map get-defined-vars- (cdr expr))))
(else ())))
(define (get-defined-vars expr)
(delete-duplicates (get-defined-vars- expr)))
; redefine f-body to support internal defines
(define f-body- f-body)
(define (f-body e)
((lambda (B)
((lambda (V)
(if (null? V)
B
(cons (list 'lambda V B) (map (lambda (x) #f) V))))
(get-defined-vars B)))
(f-body- e)))
(define = eqv)
(define eql eqv)
(define (/= a b) (not (equal a b)))
@ -334,15 +334,6 @@
(map (lambda (x) #f) binds)))
(set-syntax! 'letrec (symbol-syntax 'let*))
(define-macro (labels binds . body)
(cons (list 'lambda (map car binds)
(f-body
(nconc (map (lambda (b)
(list 'set! (car b) (cons 'lambda (cdr b))))
binds)
body)))
(map (lambda (x) #f) binds)))
(define-macro (when c . body) (list 'if c (f-body body) #f))
(define-macro (unless c . body) (list 'if c #f (f-body body)))
@ -385,96 +376,6 @@
(lambda (,e) (begin ,finally (raise ,e))))
,finally)))
; (try expr
; (catch (type-error e) . exprs)
; (catch (io-error e) . exprs)
; (catch (e) . exprs)
; (finally . exprs))
(define-macro (try expr . forms)
(let* ((e (gensym))
(reraised (gensym))
(final (f-body (cdr (or (assq 'finally forms) '(())))))
(catches (filter (lambda (f) (eq (car f) 'catch)) forms))
(catchblock `(cond
,.(map (lambda (catc)
(let* ((specific (cdr (cadr catc)))
(extype (caadr catc))
(var (if specific (car specific)
extype))
(todo (cddr catc)))
`(,(if specific
; exception matching logic
`(or (eq ,e ',extype)
(and (pair? ,e)
(eq (car ,e)
',extype)))
#t); (catch (e) ...), match anything
(let ((,var ,e)) (begin ,@todo)))))
catches)
(#t (raise ,e))))) ; no matches, reraise
(if final
(if catches
; form with both catch and finally
`(prog1 (trycatch ,expr
(lambda (,e)
(trycatch ,catchblock
(lambda (,reraised)
(begin ,final
(raise ,reraised))))))
,final)
; finally only; same as unwind-protect
`(prog1 (trycatch ,expr (lambda (,e)
(begin ,final (raise ,e))))
,final))
; catch, no finally
`(trycatch ,expr (lambda (,e) ,catchblock)))))
; setf
; expands (setf (place x ...) v) to (mutator (f x ...) v)
; (mutator (identity x ...) v) is interpreted as (mutator x ... v)
(set! *setf-place-list*
; place mutator f
'((car rplaca identity)
(cdr rplacd identity)
(caar rplaca car)
(cadr rplaca cdr)
(cdar rplacd car)
(cddr rplacd cdr)
(caaar rplaca caar)
(caadr rplaca cadr)
(cadar rplaca cdar)
(caddr rplaca cddr)
(cdaar rplacd caar)
(cdadr rplacd cadr)
(cddar rplacd cdar)
(cdddr rplacd cddr)
(list-ref rplaca nthcdr)
(get put! identity)
(aref aset! identity)
(symbol-syntax set-syntax! identity)))
(define (setf-place-mutator place val)
(if (symbol? place)
(list 'set! place val)
(let ((mutator (assq (car place) *setf-place-list*)))
(if (null? mutator)
(error "setf: unknown place " (car place))
(if (eq (caddr mutator) 'identity)
(cons (cadr mutator) (append (cdr place) (list val)))
(list (cadr mutator)
(cons (caddr mutator) (cdr place))
val))))))
(define-macro (setf . args)
(f-body
((label setf-
(lambda (args)
(if (null? args)
()
(cons (setf-place-mutator (car args) (cadr args))
(setf- (cddr args))))))
args)))
(define (revappend l1 l2) (nconc (reverse l1) l2))
(define (nreconc l1 l2) (nconc (nreverse l1) l2))
@ -600,13 +501,16 @@
(io.close F)
(raise `(load-error ,filename ,e)))))))
(define *banner*
"; _
(define (string.tail s n)
(string.sub s (string.inc s 0 n) (sizeof s)))
(define *banner* (string.tail "
; _
; |_ _ _ |_ _ | . _ _
; | (-||||_(_)|__|_)|_)
;-------------------|----------------------------------------------------------
")
" 1))
(define (repl)
(define (prompt)