Replace several define-macro' uses with syntax-rules' and `syntax-case'
This commit is contained in:
Andreas Rottmann
Andy Wingo
parent
1c0d0f2a85
commit
2649cadc43
4 changed files with 92 additions and 100 deletions
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@ -56,9 +56,11 @@
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(output git-condition-output)
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(status git-condition-status))
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(define-macro (false-if-git-error . body)
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`(,guard (c ((,git-condition? c) #f))
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,@body))
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(define-syntax false-if-git-error
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(syntax-rules ()
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((_ body0 body ...)
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(guard (c ((git-condition? c) #f))
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body0 body ...))))
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;;;
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;;; running git
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@ -128,68 +128,80 @@
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#f)
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#f)))))
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(define-macro (let-request request bindings . body)
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(let ((request-var (gensym)))
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(define-syntax let-request
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(lambda (stx)
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(define (make-binding b)
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(cond
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((symbol? b) `(,b (,rref ,request-var ',b)))
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((list? b) `(,(car b) (,rref ,request-var ',(car b) ,@(cdr b))))
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(else (error "what" b))))
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`(let ((,request-var ,request))
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(let (,@(map make-binding bindings))
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,@body))))
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(syntax-case b ()
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((id option ...)
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(identifier? #'id)
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#'(id (rref request-var 'id option ...)))
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(id
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(identifier? #'id)
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#'(id (rref request-var 'id)))))
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(syntax-case stx ()
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((_ request (binding ...) body ...)
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(with-syntax (((binding ...) (map make-binding #'(binding ...))))
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#`(let ((request-var request))
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(let (binding ...)
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body ...)))))))
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(define-macro (path-proc-case path . clauses)
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(let ((path-var (gensym)))
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(define-syntax path-proc-case
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(lambda (stx)
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(define (optional-argument? arg)
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(eqv? (string-ref arg (1- (string-length arg))) #\?))
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(eqv? (string-ref arg (- (string-length arg) 1)) #\?))
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(define (required-argument? arg)
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(eqv? (string-ref arg (1- (string-length arg))) #\!))
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(eqv? (string-ref arg (- (string-length arg) 1)) #\!))
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(define (output-argument? arg)
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(or (optional-argument? arg) (required-argument? arg)))
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(define (process-clause clause)
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(or (list-has-length? clause 2) (error "foo"))
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(if (eq? (car clause) 'else)
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clause
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(let ((pat (map symbol->string (car clause)))
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(proc (cadr clause)))
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(cond
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((find-tail output-argument? pat)
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=> (lambda (tail)
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(define test
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(let* ((npat (length pat))
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(ntail (length tail))
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(req (find-tail required-argument? tail))
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(opt (find-tail optional-argument? tail))
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(nopt (if opt (length opt) 0))
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(nreq (if req (- (length req) nopt) 0)))
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(lambda (path)
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(let ((pathtail (list-head-match pat path (- npat ntail))))
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;(pk pat npat ntail req opt nopt nreq path pathtail)
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(if (and pathtail (>= (length pathtail) nreq)
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(<= (length pathtail) (+ nreq nopt)))
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(append pathtail
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(make-list (- (+ nreq nopt) (length pathtail)) #f))
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#f)))))
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`((,test ,path-var)
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=> (lambda (outargs)
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(lambda args
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(apply ,proc (append args outargs)))))))
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(else
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`((equal? ,path-var ',pat) ,proc))))))
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`(let ((,path-var ,path))
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(cond ,@(map process-clause clauses)))))
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(syntax-case clause (else)
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((else expr ...) clause)
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(((p ...) proc)
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(let ((pat (map (lambda (p)
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(symbol->string (syntax->datum p)))
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#'(p ...))))
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(cond
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((find-tail output-argument? pat)
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=> (lambda (tail)
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(let* ((req (find-tail required-argument? tail))
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(opt (find-tail optional-argument? tail))
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(npat (length pat))
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(ntail (length tail))
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(nopt (if opt (length opt) 0))
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(nreq (if req (- (length req) nopt) 0)))
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#`((let ((pathtail (list-head-match '#,pat
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path-var
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(- #,npat #,ntail))))
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;;(pk pat npat ntail req opt nopt nreq path pathtail)
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(if (and pathtail (>= (length pathtail) #,nreq)
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(<= (length pathtail) (+ #,nreq #,nopt)))
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(append
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pathtail
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(make-list (- (+ #,nreq #,nopt) (length pathtail)) #f))
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#f))
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=> (lambda (outargs)
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(lambda args
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(apply proc (append args outargs))))))))
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(else
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#`((equal? path-var '#,pat) proc)))))))
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(syntax-case stx ()
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((_ path clause ...)
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(with-syntax (((cond-clause ...) (map process-clause #'(clause ...))))
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#`(let ((path-var path))
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(cond cond-clause ...)))))))
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(define (rcons*-fold request . keys-and-procs)
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(foldn (lambda (request k proc)
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(rcons k (proc request) request))
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2 request keys-and-procs))
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(define-macro (request-path-case request . clauses)
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`(,path-proc-case
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(,let-request ,request (method path)
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(cons method path))
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,@clauses))
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(define-syntax request-path-case
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(syntax-rules ()
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((_ request clause ...)
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(path-proc-case
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(let-request request (method path)
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(cons method path))
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clause ...))))
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(define (request-server-name request)
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(let ((headers (rref request 'headers)))
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@ -36,7 +36,7 @@
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date-increment date-comparator date-before? date-after? compose1
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rfc822-date->timestamp timestamp->rfc822-date timestamp->atom-date
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timestamp->date string-split/trimming
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list-intersperse with-backtrace with-time-debugging define-memoized))
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list-intersperse with-backtrace with-time-debugging))
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(define (emailish? x)
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(match-bind "^([a-zA-Z0-9._+-]+)@([a-zA-Z0-9-]+\\.)+[a-zA-Z]+$"
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@ -88,36 +88,26 @@
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(string-join (cons (passwd:dir (getpwnam user)) (cdr parts)) "/"))
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path)))
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(define-macro (match-lines string pattern bindings expr)
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(let ((line (gensym)) (seed (gensym)))
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`(,fold
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(lambda (,line ,seed)
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(,match-bind ,pattern ,line ,bindings
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(cons ,expr ,seed)
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,seed))
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'() (string-split ,string #\newline))))
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;; clause := ((pat args) body...)
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(define-macro (match-case string . clauses)
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(let ((str (gensym)))
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`(let ((,str ,string))
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,(let lp ((in clauses))
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(let ((clause (car in)))
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(if (eq? (car clause) 'else)
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`(begin ,@(cdr clause))
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`(match-bind ,(caar clause) ,str ,(cadar clause)
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(begin ,@(cdr clause))
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,(if (null? (cdr in))
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#f
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(lp (cdr in))))))))))
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(define-syntax match-lines
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(syntax-rules ()
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((_ string pattern bindings expr)
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(let ((rx (irregex pattern)))
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(fold
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(lambda (line seed)
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(match-bind rx line bindings
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(cons expr seed)
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seed))
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'() (string-split string #\newline))))))
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(define (dbg fmt . args)
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(apply format (current-error-port) fmt args))
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(define-macro (unwind-protect form . cleanups)
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`(dynamic-wind (lambda () #t)
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(lambda () ,form)
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(lambda () ,@cleanups)))
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(define-syntax unwind-protect
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(syntax-rules ()
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((_ form cleanup0 cleanups ...)
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(dynamic-wind (lambda () #t)
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(lambda () form)
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(lambda () cleanup0 cleanups ...)))))
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(define (dsu-sort list key less)
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(map cdr
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@ -196,8 +186,10 @@
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(fluid-set! the-last-stack (make-stack #t 2 0))
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(apply throw args)))))
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(define-macro (with-backtrace . forms)
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`(,with-backtrace* (lambda () ,@forms)))
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(define-syntax with-backtrace
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(syntax-rules ()
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((_ form0 forms ...)
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(with-backtrace* (lambda () form0 forms ...)))))
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(define (gettimeofday-diff prev)
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(let ((now (gettimeofday)))
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@ -211,8 +203,10 @@
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(proc)
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(pk 'stop-clock (gettimeofday-diff start)))))
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(define-macro (with-time-debugging . forms)
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`(,with-time-debugging* (lambda () ,@forms)))
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(define-syntax with-time-debugging
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(syntax-rules ()
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((_ form0 forms ...)
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(with-time-debugging* (lambda () form0 forms ...)))))
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(define (memoize1 proc)
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(let ((old-args #f) (cache #f) (proc proc))
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@ -224,11 +218,6 @@
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(set! cache val)
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val)))))
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(define-macro (define-memoized form . body)
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`(begin
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(define ,form ,@body)
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(set! ,(car form) (,memoize1 ,(car form)))))
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(define (write-hash h)
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(write (hash-fold acons '() h)))
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@ -32,7 +32,7 @@
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#:use-module (tekuti template)
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#:use-module (tekuti page)
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#:use-module (srfi srfi-1)
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#:export (let-headers header-ref
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#:export (header-ref
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handle-request))
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(define *status-names*
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@ -53,17 +53,6 @@
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"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" "
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"\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n"))
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;;; useless macro
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(define-macro (let-headers headers bindings . body)
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(let ((headers-var (gensym)))
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`(let ((,headers-var ,headers))
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(let (,@(map (lambda (binding)
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`(,(car binding)
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(or (assoc-ref ,headers-var ,(cadr binding))
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(error "Missing header:" ,(cadr binding)))))
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bindings))
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,@body))))
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(define (make-output request)
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(lambda (port)
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(let ((sxml (or (rref request 'sxml #f)
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