419 lines
12 KiB
Scheme
419 lines
12 KiB
Scheme
;;; module/nyacc/util.scm
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;;;
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;;; Copyright (C) 2015-2017 Matthew R. Wette
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;;;
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;;; This software is covered by the GNU GENERAL PUBLIC LICENCE, Version 3,
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;;; or any later version published by the Free Software Foundation. See
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;;; the file COPYING included with the nyacc distribution.
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;; runtime utilities for the parsers -- needs work
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(define-module (nyacc lang util)
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#:export (lang-crn-lic
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push-input pop-input reset-input-stack
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make-tl tl->list ;; rename?? to tl->sx for sxml-expr
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tl-append tl-insert tl-extend tl+attr
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sx-tag
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sx-attr sx-attr-ref sx-has-attr? sx-set-attr! sx-set-attr*
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sx-ref sx-tail sx-find
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;; for pretty-printing
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make-protect-expr make-pp-formatter make-pp-formatter/ugly
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;; for ???
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move-if-changed
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fmterr)
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#:use-module ((srfi srfi-1) #:select(find))
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)
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(cond-expand
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(guile-2)
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(guile
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(use-modules (ice-9 optargs))
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(use-modules (ice-9 syncase)))
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(mes))
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;; This is a generic copyright/licence that will be printed in the output
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;; of the examples/nyacc/lang/*/ actions.scm and tables.scm files.
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(define lang-crn-lic "
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This software is covered by the GNU GENERAL PUBLIC LICENCE, Version 3,
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or any later version published by the Free Software Foundation. See
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the file COPYING included with the this distribution.")
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(define (fmterr fmt . args)
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(apply simple-format (current-error-port) fmt args))
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;; === input stack =====================
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(define *input-stack* (make-fluid '()))
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(define (reset-input-stack)
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(fluid-set! *input-stack* '()))
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(define (push-input port)
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(let ((curr (current-input-port))
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(ipstk (fluid-ref *input-stack*)))
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(fluid-set! *input-stack* (cons curr ipstk))
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(set-current-input-port port)))
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;; Return #f if empty
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(define (pop-input)
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(let ((ipstk (fluid-ref *input-stack*)))
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(if (null? ipstk) #f
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(begin
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(set-current-input-port (car ipstk))
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(fluid-set! *input-stack* (cdr ipstk))))))
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;; It may be possible to reimplement with closures, using soft-ports.
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;; (push-string-input ...
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#|
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(define (push-string-input str)
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(let* ((prev (current-input-port))
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(port (make-soft-port ...))
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)
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#f))
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|#
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;; === tl ==============================
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;; @section Tagged Lists
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;; Tagged lists are
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;; They are implemented as a cons cell with the car and the cdr a list.
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;; The cdr is used to accumulate appended items and the car is used to
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;; keep the tag, attributes and inserted items.
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;; @example
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;; tl => '(H . T), H => (c a b 'tag); T =>
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;; @end example
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;; @table code
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;; @deffn make-tl tag [item item ...]
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;; Create a tagged-list structure.
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(define (make-tl tag . rest)
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(let iter ((tail tag) (l rest))
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(if (null? l) (cons '() tail)
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(iter (cons (car l) tail) (cdr l)))))
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;; @deffn tl->list tl
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;; Convert a tagged list structure to a list. This collects added attributes
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;; and puts them right after the (leading) tag, resulting in something like
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;; @example
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;; (<tag> (@ <attr>) <rest>)
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;; @end example
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(define (tl->list tl)
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(let ((heda (car tl))
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(head (let iter ((head '()) (attr '()) (tl-head (car tl)))
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(if (null? tl-head)
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(if (pair? attr)
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(cons (cons '@ attr) (reverse head))
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(reverse head))
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(if (and (pair? (car tl-head)) (eq? '@ (caar tl-head)))
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(iter head (cons (cdar tl-head) attr) (cdr tl-head))
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(iter (cons (car tl-head) head) attr (cdr tl-head)))))))
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(let iter ((tail '()) (tl-tail (cdr tl)))
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(if (pair? tl-tail)
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(iter (cons (car tl-tail) tail) (cdr tl-tail))
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(cons tl-tail (append head tail))))))
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;; @deffn tl-insert tl item
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;; Insert item at front of tagged list (but after tag).
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(define (tl-insert tl item)
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(cons (cons item (car tl)) (cdr tl)))
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;; @deffn tl-append tl item ...
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;; Append item at end of tagged list.
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(define (tl-append tl . rest)
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(cons (car tl)
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(let iter ((tail (cdr tl)) (items rest))
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(if (null? items) tail
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(iter (cons (car items) tail) (cdr items))))))
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;; @deffn tl-extend tl item-l
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;; Extend with a list of items.
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(define (tl-extend tl item-l)
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(apply tl-append tl item-l))
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;; @deffn tl+attr tl key val)
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;; Add an attribute to a tagged list. Return the tl.
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;; @example
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;; (tl+attr tl 'type "int")
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;; @end example
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(define (tl+attr tl key val)
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(tl-insert tl (cons '@ (list key val))))
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;; @deffn tl-merge tl tl1
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;; Merge guts of phony-tl @code{tl1} into @code{tl}.
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(define (tl-merge tl tl1)
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(error "not implemented (yet)")
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)
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;; === sx ==============================
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;; @section SXML Utility Procedures
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;; @deffn sx-ref sx ix => item
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;; Reference the @code{ix}-th element of the list, not counting the optional
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;; attributes item. If the list is shorter than the index, return @code{#f}.
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;; @example
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;; (sx-ref '(abc "def") 1) => "def"
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;; (sx-ref '(abc (@ (foo "1")) "def") 1) => "def"
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;; @end example
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(define (sx-ref sx ix)
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(define (list-xref l x) (if (> (length l) x) (list-ref l x) #f))
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(cond
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((zero? ix) (car sx))
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((and (pair? (cadr sx)) (eqv? '@ (caadr sx)))
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(list-xref sx (1+ ix)))
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(else
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(list-xref sx ix))))
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;; @deffn sx-tag sx => tag
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;; Return the tag for a tree
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(define (sx-tag sx)
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(if (pair? sx) (car sx) #f))
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;; @deffn sx-tail sx ix => (list)
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;; Return the tail starting at the ix-th cdr, starting from 0.
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;; For example, if sx has 3 items then (sx-tail sx 2) returns '().
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;; BUG: not working for (sx '(foo) 1)
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(define (sx-tail sx ix)
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(if (zero? ix) (error "zero index not supported"))
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(let ((sx (cdr sx)) (ix (1- ix)))
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(cond
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((and (null? sx) (zero? ix)) sx)
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((and (pair? (car sx)) (eqv? '@ (caar sx))) (list-tail sx (1+ ix)))
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(else (list-tail sx ix)))))
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;; @deffn sx-has-attr? sx
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;; p to determine if @arg{sx} has attributes.
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(define (sx-has-attr? sx)
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(and (pair? (cdr sx)) (pair? (cadr sx)) (eqv? '@ (caadr sx))))
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;; @deffn sx-attr sx => '(@ ...)|#f
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;; @example
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;; (sx-attr '(abc (@ (foo "1")) def) 1) => '(@ (foo "1"))
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;; @end example
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(define (sx-attr sx)
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(if (and (pair? (cdr sx)) (pair? (cadr sx)))
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(if (eqv? '@ (caadr sx))
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(cadr sx)
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#f)
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#f))
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;; @deffn sx-attr-ref sx key => val
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;; Return an attribute value given the key, or @code{#f}.
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(define (sx-attr-ref sx key)
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(and=> (sx-attr sx)
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(lambda (attr)
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(and=> (assq-ref (cdr attr) key) car))))
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;; @deffn sx-set-attr! sx key val
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;; Set attribute for sx. If no attributes exist, if key does not exist,
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;; add it, if it does exist, replace it.
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(define (sx-set-attr! sx key val . rest)
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(if (sx-has-attr? sx)
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(let ((attr (cadr sx)))
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(set-cdr! attr (assoc-set! (cdr attr) key (list val))))
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(set-cdr! sx (cons `(@ (,key ,val)) (cdr sx))))
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sx)
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;; @deffn sx-set-attr* sx key val [key val [key ... ]]
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;; Set attribute for sx. If no attributes exist, if key does not exist,
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;; add it, if it does exist, replace it.
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(define (sx-set-attr* sx . rest)
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(let iter ((attr (or (and=> (sx-attr sx) cdr) '())) (kvl rest))
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(cond
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((null? kvl) (cons* (sx-tag sx) (cons '@ (reverse attr)) (sx-tail sx 1)))
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(else (iter (cons (list (car kvl) (cadr kvl)) attr) (cddr kvl))))))
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;; @deffn sx-find tag sx => ((tag ...) (tag ...))
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;; Find the first matching element (in the first level).
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(define (sx-find tag sx)
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(find (lambda (node)
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(and (pair? node) (eqv? tag (car node))))
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sx))
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;;; === pp ==========================
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;; @section Pretty-Print and Other Utility Procedures
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;; @deffn make-protect-expr op-prec op-assc => side op expr => #t|#f
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;; Generate procedure @code{protect-expr} for pretty-printers, which takes
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;; the form @code{(protect-expr? side op expr)} and where @code{side}
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;; is @code{'lval} or @code{'rval}, @code{op} is the operator and @code{expr}
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;; is the expression. The argument @arg{op-prec} is a list of equivalent
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;; operators in order of decreasing precedence and @arg{op-assc} is an
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;; a-list of precedence with keys @code{'left}, @code{'right} and
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;; @code{nonassoc}.
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;; @example
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;; (protect-expr? 'lval '+ '(mul ...)) => TBD
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;; @end example
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(define (make-protect-expr op-prec op-assc)
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(define (assc-lt? op)
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(memq op (assq-ref op-assc 'left)))
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(define (assc-rt? op)
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(memq op (assq-ref op-assc 'right)))
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;; @deffn prec a b => '>|'<|'=|#f
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;; Returns the prececence relation of @code{a}, @code{b} as
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;; @code{<}, @code{>}, @code{=} or @code{#f} (no relation).
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(define (prec a b)
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(let iter ((ag #f) (bg #f) (opg op-prec)) ;; a-group, b-group
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(cond
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((null? opg) #f) ; indeterminate
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((memq a (car opg))
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(if bg '<
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(if (memq b (car opg)) '=
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(iter #t bg (cdr opg)))))
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((memq b (car opg))
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(if ag '>
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(if (memq a (car opg)) '=
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(iter ag #t (cdr opg)))))
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(else
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(iter ag bg (cdr opg))))))
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(lambda (side op expr)
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(let ((assc? (case side
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((lt left) assc-rt?)
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((rt right) assc-lt?)))
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(vtag (car expr)))
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(case (prec op vtag)
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((>) #t)
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((<) #f)
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((=) (assc? op))
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(else #f)))))
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;; @deffn make-pp-formatter => fmtr
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;; @example
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;; (fmtr 'push) ;; push indent level
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;; (fmtr 'pop) ;; pop indent level
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;; (fmtr "fmt" arg1 arg2 ...)
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;; @end example
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(define* (make-pp-formatter)
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(letrec
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((maxcol 78)
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(maxind 36)
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(column 0)
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(ind-lev 0)
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(ind-len 0)
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(blanks " ")
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(ind-str (lambda () (substring blanks 0 ind-len)))
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(cnt-str (lambda () (substring blanks 0 (+ 4 ind-len))))
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;;(sf-nl (lambda () (newline) (set! column 0)))
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(push-il
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(lambda ()
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(set! ind-lev (min maxind (1+ ind-lev)))
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(set! ind-len (* 2 ind-lev))))
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(pop-il
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(lambda ()
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(set! ind-lev (max 0 (1- ind-lev)))
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(set! ind-len (* 2 ind-lev))))
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(sf
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(lambda (fmt . args)
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(let* ((str (apply simple-format #f fmt args))
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(len (string-length str)))
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(cond
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((zero? column)
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(display (ind-str))
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(set! column (+ column ind-len)))
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((> (+ column len) maxcol)
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(newline)
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(display (cnt-str))
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(set! column (+ column ind-len 4))))
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(display str)
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(when (and (positive? len)
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(eqv? #\newline (string-ref str (1- len))))
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(set! column 0))))))
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(lambda (arg0 . rest)
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(cond
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;;((string? arg0) (if (> (string-length arg0) 0) (apply sf arg0 rest)))
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((string? arg0) (apply sf arg0 rest))
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((eqv? 'push arg0) (push-il))
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((eqv? 'pop arg0) (pop-il))
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((eqv? 'nlin arg0) ;; newline if needed
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(cond ((positive? column) (newline) (set! column 0))))
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(else (error "pp-formatter: bad args"))
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))))
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;; @deffn make-pp-formatter/ugly => fmtr
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;; Makes a @code{fmtr} like @code{make-pp-formatter} but no indentation
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;; and just adds strings on ...
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;; This is specific to C/C++ because it will newline if #\# seen first.
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(define* (make-pp-formatter/ugly)
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(let*
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((maxcol 78)
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(column 0)
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(sf (lambda (fmt . args)
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(let* ((str (apply simple-format #f fmt args))
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(len (string-length str)))
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(if (and (positive? len)
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(char=? #\newline (string-ref str (1- len))))
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(string-set! str (1- len) #\space))
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(cond
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((zero? len) #t) ; we reference str[0] next
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((and (equal? len 1) (char=? #\newline (string-ref str 0))) #t)
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((char=? #\# (string-ref str 0)) ; CPP-stmt: force newline
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(when (positive? column) (newline))
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(display str) ; str always ends in \n
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(set! column ; if ends \n then col= 0 else len
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(if (char=? #\newline (string-ref str (1- len)))
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0 len)))
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((zero? column)
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(display str)
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(set! column len))
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(else
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(when (> (+ column len) maxcol)
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(newline)
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(set! column 0))
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(display str)
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(set! column (+ column len))))))))
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(lambda (arg0 . rest)
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(cond
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((string? arg0) (apply sf arg0 rest))
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((eqv? 'nlin arg0) ;; newline if needed
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(cond ((positive? column) (newline) (set! column 0))))
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((eqv? 'push arg0) #f)
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((eqv? 'pop arg0) #f)
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(else (error "pp-formatter/ugly: bad args"))))))
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;; @deffn move-if-changed src-file dst-file [sav-file]
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;; Return @code{#t} if changed.
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(define (move-if-changed src-file dst-file . rest)
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(define (doit)
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(let ((sav-file (if (pair? rest) (car rest) #f)))
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(if (and sav-file (access? sav-file W_OK))
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(system (simple-format #f "mv ~A ~A" dst-file sav-file)))
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(system (simple-format #f "mv ~A ~A" src-file dst-file))
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#t))
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(cond
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;; src-file does not exist
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((not (access? src-file R_OK)) #f)
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;; dst-file does not exist, update anyhow
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((not (access? dst-file F_OK))
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(system (simple-format #f "mv ~A ~A" src-file dst-file)) #t)
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;; both exist, but no changes
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((zero? (system
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(simple-format #f "cmp ~A ~A >/dev/null" src-file dst-file)))
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(system (simple-format #f "rm ~A" src-file)) #f)
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;; both exist, update
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((access? dst-file W_OK)
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(doit))
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(else
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(simple-format (current-error-port) "move-if-changed: no write access\n")
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#f)))
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;; @end table
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;;; --- last line ---
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