419 lines
12 KiB
Scheme
419 lines
12 KiB
Scheme
;;; module/nyacc/util.scm
|
|
;;;
|
|
;;; Copyright (C) 2015 Matthew R. Wette
|
|
;;;
|
|
;;; This software is covered by the GNU GENERAL PUBLIC LICENCE, Version 3,
|
|
;;; or any later version published by the Free Software Foundation. See the
|
|
;;; file COPYING included with the nyacc distribution.
|
|
|
|
;; runtime utilities for the parsers -- needs work
|
|
|
|
(define-module (nyacc lang util)
|
|
#:export (lang-crn-lic
|
|
push-input pop-input reset-input-stack
|
|
make-tl tl->list ;; rename?? to tl->sx for sxml-expr
|
|
tl-append tl-insert tl-extend tl+attr
|
|
sx-tag
|
|
sx-attr sx-attr-ref sx-has-attr? sx-set-attr! sx-set-attr*
|
|
sx-ref sx-tail sx-find
|
|
;; for pretty-printing
|
|
make-protect-expr make-pp-formatter make-pp-formatter/ugly
|
|
;; for ???
|
|
move-if-changed
|
|
fmterr)
|
|
#:use-module ((srfi srfi-1) #:select(find))
|
|
)
|
|
|
|
(cond-expand
|
|
(guile-2)
|
|
(guile
|
|
(use-modules (ice-9 optargs))
|
|
(use-modules (ice-9 syncase)))
|
|
(mes))
|
|
|
|
;; This is a generic copyright/licence that will be printed in the output
|
|
;; of the examples/nyacc/lang/*/ actions.scm and tables.scm files.
|
|
(define lang-crn-lic "Copyright (C) 2015,2016 Matthew R. Wette
|
|
|
|
This software is covered by the GNU GENERAL PUBLIC LICENCE, Version 3,
|
|
or any later version published by the Free Software Foundation. See the
|
|
file COPYING included with the this distribution.")
|
|
|
|
(define (fmterr fmt . args)
|
|
(apply simple-format (current-error-port) fmt args))
|
|
|
|
;; === input stack =====================
|
|
|
|
(define *input-stack* (make-fluid '()))
|
|
|
|
(define (reset-input-stack)
|
|
(fluid-set! *input-stack* '()))
|
|
|
|
(define (push-input port)
|
|
(let ((curr (current-input-port))
|
|
(ipstk (fluid-ref *input-stack*)))
|
|
(fluid-set! *input-stack* (cons curr ipstk))
|
|
(set-current-input-port port)))
|
|
|
|
;; Return #f if empty
|
|
(define (pop-input)
|
|
(let ((ipstk (fluid-ref *input-stack*)))
|
|
(if (null? ipstk) #f
|
|
(begin
|
|
(set-current-input-port (car ipstk))
|
|
(fluid-set! *input-stack* (cdr ipstk))))))
|
|
|
|
;; It may be possible to reimplement with closures, using soft-ports.
|
|
;; (push-string-input ...
|
|
|
|
#|
|
|
(define (push-string-input str)
|
|
(let* ((prev (current-input-port))
|
|
(port (make-soft-port ...))
|
|
)
|
|
#f))
|
|
|#
|
|
|
|
;; === tl ==============================
|
|
|
|
;; @section Tagged Lists
|
|
;; Tagged lists are
|
|
;; They are implemented as a cons cell with the car and the cdr a list.
|
|
;; The cdr is used to accumulate appended items and the car is used to
|
|
;; keep the tag, attributes and inserted items.
|
|
;; @example
|
|
;; tl => '(H . T), H => (c a b 'tag); T =>
|
|
;; @end example
|
|
|
|
;; @table code
|
|
|
|
;; @deffn make-tl tag [item item ...]
|
|
;; Create a tagged-list structure.
|
|
(define (make-tl tag . rest)
|
|
(let iter ((tail tag) (l rest))
|
|
(if (null? l) (cons '() tail)
|
|
(iter (cons (car l) tail) (cdr l)))))
|
|
|
|
;; @deffn tl->list tl
|
|
;; Convert a tagged list structure to a list. This collects added attributes
|
|
;; and puts them right after the (leading) tag, resulting in something like
|
|
;; @example
|
|
;; (<tag> (@ <attr>) <rest>)
|
|
;; @end example
|
|
(define (tl->list tl)
|
|
(let ((heda (car tl))
|
|
(head (let iter ((head '()) (attr '()) (tl-head (car tl)))
|
|
(if (null? tl-head)
|
|
(if (pair? attr)
|
|
(cons (cons '@ attr) (reverse head))
|
|
(reverse head))
|
|
(if (and (pair? (car tl-head)) (eq? '@ (caar tl-head)))
|
|
(iter head (cons (cdar tl-head) attr) (cdr tl-head))
|
|
(iter (cons (car tl-head) head) attr (cdr tl-head)))))))
|
|
(let iter ((tail '()) (tl-tail (cdr tl)))
|
|
(if (pair? tl-tail)
|
|
(iter (cons (car tl-tail) tail) (cdr tl-tail))
|
|
(cons tl-tail (append head tail))))))
|
|
|
|
;; @deffn tl-insert tl item
|
|
;; Insert item at front of tagged list (but after tag).
|
|
(define (tl-insert tl item)
|
|
(cons (cons item (car tl)) (cdr tl)))
|
|
|
|
;; @deffn tl-append tl item ...
|
|
;; Append item at end of tagged list.
|
|
(define (tl-append tl . rest)
|
|
(cons (car tl)
|
|
(let iter ((tail (cdr tl)) (items rest))
|
|
(if (null? items) tail
|
|
(iter (cons (car items) tail) (cdr items))))))
|
|
|
|
;; @deffn tl-extend tl item-l
|
|
;; Extend with a list of items.
|
|
(define (tl-extend tl item-l)
|
|
(apply tl-append tl item-l))
|
|
|
|
;; @deffn tl+attr tl key val)
|
|
;; Add an attribute to a tagged list. Return the tl.
|
|
;; @example
|
|
;; (tl+attr tl 'type "int")
|
|
;; @end example
|
|
(define (tl+attr tl key val)
|
|
(tl-insert tl (cons '@ (list key val))))
|
|
|
|
;; @deffn tl-merge tl tl1
|
|
;; Merge guts of phony-tl @code{tl1} into @code{tl}.
|
|
(define (tl-merge tl tl1)
|
|
(error "not implemented (yet)")
|
|
)
|
|
|
|
;; === sx ==============================
|
|
;; @section SXML Utility Procedures
|
|
|
|
;; @deffn sx-ref sx ix => item
|
|
;; Reference the @code{ix}-th element of the list, not counting the optional
|
|
;; attributes item. If the list is shorter than the index, return @code{#f}.
|
|
;; @example
|
|
;; (sx-ref '(abc "def") 1) => "def"
|
|
;; (sx-ref '(abc (@ (foo "1")) "def") 1) => "def"
|
|
;; @end example
|
|
(define (sx-ref sx ix)
|
|
(define (list-xref l x) (if (> (length l) x) (list-ref l x) #f))
|
|
(cond
|
|
((zero? ix) (car sx))
|
|
((and (pair? (cadr sx)) (eqv? '@ (caadr sx)))
|
|
(list-xref sx (1+ ix)))
|
|
(else
|
|
(list-xref sx ix))))
|
|
|
|
;; @deffn sx-tag sx => tag
|
|
;; Return the tag for a tree
|
|
(define (sx-tag sx)
|
|
(if (pair? sx) (car sx) #f))
|
|
|
|
;; @deffn sx-tail sx ix => (list)
|
|
;; Return the tail starting at the ix-th cdr, starting from 0.
|
|
;; For example, if sx has 3 items then (sx-tail sx 2) returns '().
|
|
;; BUG: not working for (sx '(foo) 1)
|
|
(define (sx-tail sx ix)
|
|
(if (zero? ix) (error "zero index not supported"))
|
|
(let ((sx (cdr sx)) (ix (1- ix)))
|
|
(cond
|
|
((and (null? sx) (zero? ix)) sx)
|
|
((and (pair? (car sx)) (eqv? '@ (caar sx))) (list-tail sx (1+ ix)))
|
|
(else (list-tail sx ix)))))
|
|
|
|
;; @deffn sx-has-attr? sx
|
|
;; p to determine if @arg{sx} has attributes.
|
|
(define (sx-has-attr? sx)
|
|
(and (pair? (cdr sx)) (pair? (cadr sx)) (eqv? '@ (caadr sx))))
|
|
|
|
;; @deffn sx-attr sx => '(@ ...)|#f
|
|
;; @example
|
|
;; (sx-attr '(abc (@ (foo "1")) def) 1) => '(@ (foo "1"))
|
|
;; @end example
|
|
(define (sx-attr sx)
|
|
(if (and (pair? (cdr sx)) (pair? (cadr sx)))
|
|
(if (eqv? '@ (caadr sx))
|
|
(cadr sx)
|
|
#f)
|
|
#f))
|
|
|
|
;; @deffn sx-attr-ref sx key => val
|
|
;; Return an attribute value given the key, or @code{#f}.
|
|
(define (sx-attr-ref sx key)
|
|
(and=> (sx-attr sx)
|
|
(lambda (attr)
|
|
(and=> (assq-ref (cdr attr) key) car))))
|
|
|
|
;; @deffn sx-set-attr! sx key val
|
|
;; Set attribute for sx. If no attributes exist, if key does not exist,
|
|
;; add it, if it does exist, replace it.
|
|
(define (sx-set-attr! sx key val . rest)
|
|
(if (sx-has-attr? sx)
|
|
(let ((attr (cadr sx)))
|
|
(set-cdr! attr (assoc-set! (cdr attr) key (list val))))
|
|
(set-cdr! sx (cons `(@ (,key ,val)) (cdr sx))))
|
|
sx)
|
|
|
|
;; @deffn sx-set-attr* sx key val [key val [key ... ]]
|
|
;; Set attribute for sx. If no attributes exist, if key does not exist,
|
|
;; add it, if it does exist, replace it.
|
|
(define (sx-set-attr* sx . rest)
|
|
(let iter ((attr (or (and=> (sx-attr sx) cdr) '())) (kvl rest))
|
|
(cond
|
|
((null? kvl) (cons* (sx-tag sx) (cons '@ (reverse attr)) (sx-tail sx 1)))
|
|
(else (iter (cons (list (car kvl) (cadr kvl)) attr) (cddr kvl))))))
|
|
|
|
;; @deffn sx-find tag sx => ((tag ...) (tag ...))
|
|
;; Find the first matching element (in the first level).
|
|
(define (sx-find tag sx)
|
|
(find (lambda (node)
|
|
(and (pair? node) (eqv? tag (car node))))
|
|
sx))
|
|
|
|
;;; === pp ==========================
|
|
;; @section Pretty-Print and Other Utility Procedures
|
|
|
|
;; @deffn make-protect-expr op-prec op-assc => side op expr => #t|#f
|
|
;; Generate procedure @code{protect-expr} for pretty-printers, which takes
|
|
;; the form @code{(protect-expr? side op expr)} and where @code{side}
|
|
;; is @code{'lval} or @code{'rval}, @code{op} is the operator and @code{expr}
|
|
;; is the expression. The argument @arg{op-prec} is a list of equivalent
|
|
;; operators in order of decreasing precedence and @arg{op-assc} is an
|
|
;; a-list of precedence with keys @code{'left}, @code{'right} and
|
|
;; @code{nonassoc}.
|
|
;; @example
|
|
;; (protect-expr? 'lval '+ '(mul ...)) => TBD
|
|
;; @end example
|
|
(define (make-protect-expr op-prec op-assc)
|
|
|
|
(define (assc-lt? op)
|
|
(memq op (assq-ref op-assc 'left)))
|
|
|
|
(define (assc-rt? op)
|
|
(memq op (assq-ref op-assc 'right)))
|
|
|
|
;; @deffn prec a b => '>|'<|'=|#f
|
|
;; Returns the prececence relation of @code{a}, @code{b} as
|
|
;; @code{<}, @code{>}, @code{=} or @code{#f} (no relation).
|
|
(define (prec a b)
|
|
(let iter ((ag #f) (bg #f) (opg op-prec)) ;; a-group, b-group
|
|
(cond
|
|
((null? opg) #f) ; indeterminate
|
|
((memq a (car opg))
|
|
(if bg '<
|
|
(if (memq b (car opg)) '=
|
|
(iter #t bg (cdr opg)))))
|
|
((memq b (car opg))
|
|
(if ag '>
|
|
(if (memq a (car opg)) '=
|
|
(iter ag #t (cdr opg)))))
|
|
(else
|
|
(iter ag bg (cdr opg))))))
|
|
|
|
(lambda (side op expr)
|
|
(let ((assc? (case side
|
|
((lt left) assc-rt?)
|
|
((rt right) assc-lt?)))
|
|
(vtag (car expr)))
|
|
(case (prec op vtag)
|
|
((>) #t)
|
|
((<) #f)
|
|
((=) (assc? op))
|
|
(else #f)))))
|
|
|
|
;; @deffn make-pp-formatter => fmtr
|
|
;; @example
|
|
;; (fmtr 'push) ;; push indent level
|
|
;; (fmtr 'pop) ;; pop indent level
|
|
;; (fmtr "fmt" arg1 arg2 ...)
|
|
;; @end example
|
|
(define* (make-pp-formatter)
|
|
(letrec
|
|
((maxcol 78)
|
|
(maxind 36)
|
|
(column 0)
|
|
(ind-lev 0)
|
|
(ind-len 0)
|
|
(blanks " ")
|
|
(ind-str (lambda () (substring blanks 0 ind-len)))
|
|
(cnt-str (lambda () (substring blanks 0 (+ 4 ind-len))))
|
|
;;(sf-nl (lambda () (newline) (set! column 0)))
|
|
|
|
(push-il
|
|
(lambda ()
|
|
(set! ind-lev (min maxind (1+ ind-lev)))
|
|
(set! ind-len (* 2 ind-lev))))
|
|
|
|
(pop-il
|
|
(lambda ()
|
|
(set! ind-lev (max 0 (1- ind-lev)))
|
|
(set! ind-len (* 2 ind-lev))))
|
|
|
|
(sf
|
|
(lambda (fmt . args)
|
|
(let* ((str (apply simple-format #f fmt args))
|
|
(len (string-length str)))
|
|
(cond
|
|
((zero? column)
|
|
(display (ind-str))
|
|
(set! column (+ column ind-len)))
|
|
((> (+ column len) maxcol)
|
|
(newline)
|
|
(display (cnt-str))
|
|
(set! column (+ column ind-len 4))))
|
|
(display str)
|
|
(when (and (positive? len)
|
|
(eqv? #\newline (string-ref str (1- len))))
|
|
(set! column 0))))))
|
|
|
|
(lambda (arg0 . rest)
|
|
(cond
|
|
;;((string? arg0) (if (> (string-length arg0) 0) (apply sf arg0 rest)))
|
|
((string? arg0) (apply sf arg0 rest))
|
|
((eqv? 'push arg0) (push-il))
|
|
((eqv? 'pop arg0) (pop-il))
|
|
((eqv? 'nlin arg0) ;; newline if needed
|
|
(cond ((positive? column) (newline) (set! column 0))))
|
|
(else (error "pp-formatter: bad args"))
|
|
))))
|
|
|
|
;; @deffn make-pp-formatter/ugly => fmtr
|
|
;; Makes a @code{fmtr} like @code{make-pp-formatter} but no indentation
|
|
;; and just adds strings on ...
|
|
;; This is specific to C/C++ because it will newline if #\# seen first.
|
|
(define* (make-pp-formatter/ugly)
|
|
(let*
|
|
((maxcol 78)
|
|
(column 0)
|
|
(sf (lambda (fmt . args)
|
|
(let* ((str (apply simple-format #f fmt args))
|
|
(len (string-length str)))
|
|
(if (and (positive? len)
|
|
(char=? #\newline (string-ref str (1- len))))
|
|
(string-set! str (1- len) #\space))
|
|
(cond
|
|
((zero? len) #t) ; we reference str[0] next
|
|
((and (equal? len 1) (char=? #\newline (string-ref str 0))) #t)
|
|
((char=? #\# (string-ref str 0)) ; CPP-stmt: force newline
|
|
(when (positive? column) (newline))
|
|
(display str) ; str always ends in \n
|
|
(set! column ; if ends \n then col= 0 else len
|
|
(if (char=? #\newline (string-ref str (1- len)))
|
|
0 len)))
|
|
((zero? column)
|
|
(display str)
|
|
(set! column len))
|
|
(else
|
|
(when (> (+ column len) maxcol)
|
|
(newline)
|
|
(set! column 0))
|
|
(display str)
|
|
(set! column (+ column len))))))))
|
|
|
|
(lambda (arg0 . rest)
|
|
(cond
|
|
((string? arg0) (apply sf arg0 rest))
|
|
((eqv? 'nlin arg0) ;; newline if needed
|
|
(cond ((positive? column) (newline) (set! column 0))))
|
|
((eqv? 'push arg0) #f)
|
|
((eqv? 'pop arg0) #f)
|
|
(else (error "pp-formatter/ugly: bad args"))))))
|
|
|
|
;; @deffn move-if-changed src-file dst-file [sav-file]
|
|
;; Return @code{#t} if changed.
|
|
(define (move-if-changed src-file dst-file . rest)
|
|
|
|
(define (doit)
|
|
(let ((sav-file (if (pair? rest) (car rest) #f)))
|
|
(if (and sav-file (access? sav-file W_OK))
|
|
(system (simple-format #f "mv ~A ~A" dst-file sav-file)))
|
|
(system (simple-format #f "mv ~A ~A" src-file dst-file))
|
|
#t))
|
|
|
|
(cond
|
|
;; src-file does not exist
|
|
((not (access? src-file R_OK)) #f)
|
|
|
|
;; dst-file does not exist, update anyhow
|
|
((not (access? dst-file F_OK))
|
|
(system (simple-format #f "mv ~A ~A" src-file dst-file)) #t)
|
|
|
|
;; both exist, but no changes
|
|
((zero? (system
|
|
(simple-format #f "cmp ~A ~A >/dev/null" src-file dst-file)))
|
|
(system (simple-format #f "rm ~A" src-file)) #f)
|
|
|
|
;; both exist, update
|
|
((access? dst-file W_OK)
|
|
(doit))
|
|
|
|
(else
|
|
(simple-format (current-error-port) "move-if-changed: no write access\n")
|
|
#f)))
|
|
|
|
;; @end table
|
|
|
|
;;; --- last line ---
|