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(define-module (parse)
:use-module (rnrs io ports)
:use-module (rnrs bytevectors)
:use-module (srfi srfi-9)
)
(define-record-type <vcomponent>
(make-vcomponent% type children parent attributes)
vcomponent?
(type component-type)
(children get-component-children set-component-children!)
(parent get-component-parent set-component-parent!)
(attributes get-component-attributes))
(define* (make-vcomponent #:optional (type 'VIRTUAL))
(make-vcomponent% type '() #f (make-hash-table #x10)))
(define (add-child! parent child)
(set-component-children! parent (cons child (get-component-children parent)))
(set-component-parent! child parent))
(define (set-attribute! component key value)
(let ((ht (get-component-attributes component)))
(cond [(hashq-ref ht key #f)
=> (lambda (pair) (set-cdr! pair value))]
[else (hashq-set! ht key (cons (make-hash-table) value))])))
(define contexts '(key value param-name param-value escape))
(define-record-type <parse-ctx>
(make-parse-ctx% row col ctx line-key param-key param-table)
parse-ctx?
(row get-row set-row!)
(col get-col set-col!)
(ctx get-ctx set-ctx!)
(line-key get-line-key set-line-key!)
(param-key get-param-key set-param-key!)
(param-table get-param-table set-param-table!)
)
(define (make-parse-ctx)
(make-parse-ctx% 0 0 'key
#f #f (make-hash-table)))
(define (increment-column! ctx)
(set-col! ctx (1+ (get-col ctx))))
(define (increment-row! ctx)
(set-col! ctx 0)
(set-row! ctx (1+ (get-row ctx))))
(define-record-type <strbuf>
(make-strbuf% len bytes)
strbuf?
(len get-length set-length!)
(bytes get-bytes)
)
(define (make-strbuf)
(make-strbuf% 0 (make-u8vector #x1000))
)
(define (strbuf->string strbuf)
(let ((bv (make-u8vector (get-length strbuf))))
(bytevector-copy! (get-bytes strbuf) 0
bv 0
(get-length strbuf))
(bytevector->string bv (native-transcoder)))) ; TODO charset
(define (strbuf-reset! strbuf)
(set-length! strbuf 0))
(define (strbuf-append! strbuf u8)
(u8vector-set! (get-bytes strbuf)
(get-length strbuf)
u8)
(set-length! strbuf (1+ (get-length strbuf))))
(define (fold-proc ctx c)
(let ((pair (cons (if (= c (char->integer #\newline))
c (get-u8 (current-input-port)))
(get-u8 (current-input-port)))))
(increment-row! ctx)
(cond [(not (= (char->integer #\newline)
(car pair)))
;; ERROR expected newline after CR
'error
]
[(memv (integer->char (cdr pair)) '(#\space #\tab))
(increment-column! ctx)
'fold
]
#;
[ungetc...
'writeback-error
]
[else
;; ...
'end-of-line
]
)))
(define (parse-file filename file root)
(set-current-input-port file)
(let ((component root)
(ctx (make-parse-ctx))
(strbuf (make-strbuf)))
(catch #t
(lambda ()
(while #t
(let ((c (get-u8 (current-input-port))))
(cond
[(eof-object? c)
(break)]
[(memv (integer->char c) '(#\return #\newline))
(case (fold-proc ctx c)
[(error writeback-error) => (lambda (t) (throw t))]
[(end-of-line)
(let ((str (strbuf->string strbuf)))
(cond [(string=? (get-line-key ctx) "BEGIN")
(let ((child (make-vcomponent (string->symbol str))))
(add-child! component child)
(set! component child))]
[(string=? (get-line-key ctx) "END")
(set! component (get-component-parent component))]
[else
(let ((ht (get-component-attributes component)))
;; TODO repeated keys
(hashq-set! ht (string->symbol (get-line-key ctx))
(cons (get-param-table ctx)
str))
(set-param-table! ctx (make-hash-table)))])
(strbuf-reset! strbuf)
(set-ctx! ctx 'key))])]
[(char=? (integer->char c) #\\)
(let ((cc (get-u8 (current-input-port))))
(case cc
[(#\return #\newline) ;; TODO fold?
(fold-proc ctx cc)
]
[(#\n #\N)
(strbuf-append! strbuf (char->integer #\newline))]
[(#\; #\, #\\) => (lambda (c) (strbuf-append! strbuf c))]
[else 'err]
)
(increment-column! ctx))]
[(and (eq? (get-ctx ctx) 'panam-name) (char=? (integer->char c) #\=))
(set-param-key! ctx (strbuf->string strbuf))
(strbuf-reset! strbuf)
(set-ctx! ctx 'param-value)]
[(memv (integer->char c) '(#\: #\;))
(case (get-ctx ctx)
[(param-value)
(hashq-set! (get-param-table ctx)
(get-param-key ctx)
(strbuf->string strbuf))
(strbuf-reset! strbuf)]
[(key)
(set-line-key! ctx (strbuf->string strbuf))
(strbuf-reset! strbuf)])
(set-ctx! ctx (case c
[(#\:) 'value]
[(#\;) 'param-name]))]
[else
(strbuf-append! strbuf c)
(increment-column! ctx)
]))))
(lambda (err . args)
(format #t "err = ~a~%ctx = ~a~%args = ~a~%"
err ctx args)
))))
;;; TODO
(define (open-ics path cal)
(define f (open-input-file path))
(parse-file path f cal))
(define (handle-dir cal path)
'TODO
;; TODO
)
(define (handle-file cal path)
(set-attribute! cal 'X-HNH-SOURCETYPE "file")
(open-ics path cal)
)
(define (read-vcalendar root path)
(define st (stat path))
(case (stat:type st)
[(regular) (handle-file root path)]
[(directory) (handle-dir root path)]
[(block-special char-special fifo socket unknown symlink)
=> (lambda (t) (throw t))])
)
(define (parse-cal-path path)
(define root (make-vcomponent))
(read-vcalendar root path)
root)
(define root (parse-cal-path "/home/hugo/.local/var/cal/STABEN/599ca4a2f8eda362aaac598c999321dcc8004780a1d5cef36019c7e421b70b08.ics"))
(format #t "root = ~a~%" root)
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