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+;*=====================================================================*/
+;* serrano/prgm/project/skribe/src/bigloo/read.scm */
+;* ------------------------------------------------------------- */
+;* Author : Manuel Serrano */
+;* Creation : Tue Dec 27 11:16:00 1994 */
+;* Last change : Mon Nov 8 13:30:32 2004 (serrano) */
+;* ------------------------------------------------------------- */
+;* Skribe's reader */
+;*=====================================================================*/
+
+;*---------------------------------------------------------------------*/
+;* Le module */
+;*---------------------------------------------------------------------*/
+(module skribe_read
+ (export (skribe-read . port)))
+
+;*---------------------------------------------------------------------*/
+;* Global counteurs ... */
+;*---------------------------------------------------------------------*/
+(define *par-open* 0)
+
+;*---------------------------------------------------------------------*/
+;* Parenthesis mismatch (or unclosing) errors. */
+;*---------------------------------------------------------------------*/
+(define *list-error-level* 20)
+(define *list-errors* (make-vector *list-error-level* #unspecified))
+(define *vector-errors* (make-vector *list-error-level* #unspecified))
+
+;*---------------------------------------------------------------------*/
+;* Control variables. */
+;*---------------------------------------------------------------------*/
+(define *end-of-list* (cons 0 0))
+(define *dotted-mark* (cons 1 1))
+
+;*---------------------------------------------------------------------*/
+;* skribe-reader-reset! ... */
+;*---------------------------------------------------------------------*/
+(define (skribe-reader-reset!)
+ (set! *par-open* 0))
+
+;*---------------------------------------------------------------------*/
+;* read-error ... */
+;*---------------------------------------------------------------------*/
+(define (read-error msg obj port)
+ (let* ((obj-loc (if (epair? obj)
+ (match-case (cer obj)
+ ((at ?fname ?pos ?-)
+ pos)
+ (else
+ #f))
+ #f))
+ (loc (if (number? obj-loc)
+ obj-loc
+ (cond
+ ((>fx *par-open* 0)
+ (let ((open-key (-fx *par-open* 1)))
+ (if (<fx open-key (vector-length *list-errors*))
+ (vector-ref *list-errors* open-key)
+ #f)))
+ (else
+ #f)))))
+ (if (fixnum? loc)
+ (error/location "skribe-read" msg obj (input-port-name port) loc)
+ (error "skribe-read" msg obj))))
+
+;*---------------------------------------------------------------------*/
+;* make-list! ... */
+;*---------------------------------------------------------------------*/
+(define (make-list! l port)
+ (define (reverse-proper-list! l)
+ (let nr ((l l)
+ (r '()))
+ (cond
+ ((eq? (car l) *dotted-mark*)
+ (read-error "Illegal pair" r port))
+ ((null? (cdr l))
+ (set-cdr! l r)
+ l)
+ (else
+ (let ((cdrl (cdr l)))
+ (nr cdrl
+ (begin (set-cdr! l r)
+ l)))))))
+ (define (reverse-improper-list! l)
+ (let nr ((l (cddr l))
+ (r (car l)))
+ (cond
+ ((eq? (car l) *dotted-mark*)
+ (read-error "Illegal pair" r port))
+ ((null? (cdr l))
+ (set-cdr! l r)
+ l)
+ (else
+ (let ((cdrl (cdr l)))
+ (nr cdrl
+ (begin (set-cdr! l r)
+ l)))))))
+ (cond
+ ((null? l)
+ l)
+ ((and (pair? l) (pair? (cdr l)) (eq? (cadr l) *dotted-mark*))
+ (if (null? (cddr l))
+ (car l)
+ (reverse-improper-list! l)))
+ (else
+ (reverse-proper-list! l))))
+
+;*---------------------------------------------------------------------*/
+;* make-at ... */
+;*---------------------------------------------------------------------*/
+(define (make-at name pos)
+ (cond-expand
+ ((or bigloo2.4 bigloo2.5 bigloo2.6)
+ `(at ,name ,pos _))
+ (else
+ `(at ,name ,pos))))
+
+;*---------------------------------------------------------------------*/
+;* collect-up-to ... */
+;* ------------------------------------------------------------- */
+;* The first pair of the list is special because of source file */
+;* location. We want the location to be associated to the first */
+;* open parenthesis, not the last character of the car of the list. */
+;*---------------------------------------------------------------------*/
+(define-inline (collect-up-to ignore kind port)
+ (let ((name (input-port-name port)))
+ (let* ((pos (input-port-position port))
+ (item (ignore)))
+ (if (eq? item *end-of-list*)
+ '()
+ (let loop ((acc (econs item '() (make-at name pos))))
+ (let ((item (ignore)))
+ (if (eq? item *end-of-list*)
+ acc
+ (loop (let ((new-pos (input-port-position port)))
+ (econs item
+ acc
+ (make-at name new-pos)))))))))))
+
+;*---------------------------------------------------------------------*/
+;* read-quote ... */
+;*---------------------------------------------------------------------*/
+(define (read-quote kwote port ignore)
+ (let* ((pos (input-port-position port))
+ (obj (ignore)))
+ (if (or (eof-object? obj) (eq? obj *end-of-list*))
+ (error/location "read"
+ "Illegal quotation"
+ kwote
+ (input-port-name port)
+ pos))
+ (econs kwote
+ (cons obj '())
+ (make-at (input-port-name port) pos))))
+
+;*---------------------------------------------------------------------*/
+;* *sexp-grammar* ... */
+;*---------------------------------------------------------------------*/
+(define *sexp-grammar*
+ (regular-grammar ((float (or (: (* digit) "." (+ digit))
+ (: (+ digit) "." (* digit))))
+ (letter (in ("azAZ") (#a128 #a255)))
+ (special (in "!@~$%^&*></-_+\\=?.:{}"))
+ (kspecial (in "!@~$%^&*></-_+\\=?."))
+ (quote (in "\",'`"))
+ (paren (in "()"))
+ (id (: (* digit)
+ (or letter special)
+ (* (or letter special digit (in ",'`")))))
+ (kid (: (* digit)
+ (or letter kspecial)
+ (* (or letter kspecial digit (in ",'`")))))
+ (blank (in #\Space #\Tab #a012 #a013)))
+
+ ;; newlines
+ ((+ #\Newline)
+ (ignore))
+
+ ;; blank lines
+ ((+ blank)
+ (ignore))
+
+ ;; comments
+ ((: ";" (* all))
+ (ignore))
+
+ ;; the interpreter header or the dsssl named constants
+ ((: "#!" (+ (in letter)))
+ (let* ((str (the-string)))
+ (cond
+ ((string=? str "#!optional")
+ boptional)
+ ((string=? str "#!rest")
+ brest)
+ ((string=? str "#!key")
+ bkey)
+ (else
+ (ignore)))))
+
+ ;; characters
+ ((: (uncase "#a") (= 3 digit))
+ (let ((string (the-string)))
+ (if (not (=fx (the-length) 5))
+ (error/location "skribe-read"
+ "Illegal ascii character"
+ string
+ (input-port-name (the-port))
+ (input-port-position (the-port)))
+ (integer->char (string->integer (the-substring 2 5))))))
+ ((: "#\\" (or letter digit special (in "|#; []" quote paren)))
+ (string-ref (the-string) 2))
+ ((: "#\\" (>= 2 letter))
+ (let ((char-name (string->symbol
+ (string-upcase!
+ (the-substring 2 (the-length))))))
+ (case char-name
+ ((NEWLINE)
+ #\Newline)
+ ((TAB)
+ #\tab)
+ ((SPACE)
+ #\space)
+ ((RETURN)
+ (integer->char 13))
+ (else
+ (error/location "skribe-read"
+ "Illegal character"
+ (the-string)
+ (input-port-name (the-port))
+ (input-port-position (the-port)))))))
+
+ ;; ucs-2 characters
+ ((: "#u" (= 4 xdigit))
+ (integer->ucs2 (string->integer (the-substring 2 6) 16)))
+
+ ((: "\"" (* (or (out #a000 #\\ #\") (: #\\ all))) "\"")
+ (let ((str (the-substring 1 (-fx (the-length) 1))))
+ (let ((str (the-substring 0 (-fx (the-length) 1))))
+ (escape-C-string str))))
+ ;; ucs2 strings
+ ((: "#u\"" (* (or (out #a000 #\\ #\") (: #\\ all))) "\"")
+ (let ((str (the-substring 3 (-fx (the-length) 1))))
+ (utf8-string->ucs2-string str)))
+
+ ;; fixnums
+ ((: (? (in "-+")) (+ digit))
+ (the-fixnum))
+ ((: "#o" (? (in "-+")) (+ (in ("07"))))
+ (string->integer (the-substring 2 (the-length)) 8))
+ ((: "#d" (? (in "-+")) (+ (in ("09"))))
+ (string->integer (the-substring 2 (the-length)) 10))
+ ((: "#x" (? (in "-+")) (+ (in (uncase (in ("09af"))))))
+ (string->integer (the-substring 2 (the-length)) 16))
+ ((: "#e" (? (in "-+")) (+ digit))
+ (string->elong (the-substring 2 (the-length)) 10))
+ ((: "#l" (? (in "-+")) (+ digit))
+ (string->llong (the-substring 2 (the-length)) 10))
+
+ ;; flonum
+ ((: (? (in "-+"))
+ (or float
+ (: (or float (+ digit)) (in "eE") (? (in "+-")) (+ digit))))
+ (the-flonum))
+
+ ;; doted pairs
+ ("."
+ (if (<=fx *par-open* 0)
+ (error/location "read"
+ "Illegal token"
+ #\.
+ (input-port-name (the-port))
+ (input-port-position (the-port)))
+ *dotted-mark*))
+
+ ;; unspecified and eof-object
+ ((: "#" (in "ue") (+ (in "nspecified-objt")))
+ (let ((symbol (string->symbol
+ (string-upcase!
+ (the-substring 1 (the-length))))))
+ (case symbol
+ ((UNSPECIFIED)
+ unspec)
+ ((EOF-OBJECT)
+ beof)
+ (else
+ (error/location "read"
+ "Illegal identifier"
+ symbol
+ (input-port-name (the-port))
+ (input-port-position (the-port)))))))
+
+ ;; booleans
+ ((: "#" (uncase #\t))
+ #t)
+ ((: "#" (uncase #\f))
+ #f)
+
+ ;; keywords
+ ((or (: ":" kid) (: kid ":"))
+ ;; since the keyword expression is also matched by the id
+ ;; rule, keyword rule has to be placed before the id rule.
+ (the-keyword))
+
+ ;; identifiers
+ (id
+ ;; this rule has to be placed after the rule matching the `.' char
+ (the-symbol))
+ ((: "|" (+ (or (out #a000 #\\ #\|) (: #\\ all))) "|")
+ (if (=fx (the-length) 2)
+ (the-symbol)
+ (let ((str (the-substring 0 (-fx (the-length) 1))))
+ (string->symbol (escape-C-string str)))))
+
+ ;; quotations
+ ("'"
+ (read-quote 'quote (the-port) ignore))
+ ("`"
+ (read-quote 'quasiquote (the-port) ignore))
+ (","
+ (read-quote 'unquote (the-port) ignore))
+ (",@"
+ (read-quote 'unquote-splicing (the-port) ignore))
+
+ ;; lists
+ (#\(
+ ;; if possible, we store the opening parenthesis.
+ (if (and (vector? *list-errors*)
+ (<fx *par-open* (vector-length *list-errors*)))
+ (vector-set! *list-errors*
+ *par-open*
+ (input-port-position (the-port))))
+ ;; we increment the number of open parenthesis
+ (set! *par-open* (+fx 1 *par-open*))
+ ;; and then, we compute the result list...
+ (make-list! (collect-up-to ignore "list" (the-port)) (the-port)))
+ (#\)
+ ;; we decrement the number of open parenthesis
+ (set! *par-open* (-fx *par-open* 1))
+ (if (<fx *par-open* 0)
+ (begin
+ (warning/location (input-port-name (the-port))
+ (input-port-position (the-port))
+ "read"
+ "Superfluous closing parenthesis `"
+ (the-string)
+ "'")
+ (set! *par-open* 0)
+ (ignore))
+ *end-of-list*))
+
+ ;; list of strings
+ (#\[
+ (let ((exp (read/rp *text-grammar* (the-port))))
+ (list 'quasiquote exp)))
+
+ ;; vectors
+ ("#("
+ ;; if possible, we store the opening parenthesis.
+ (if (and (vector? *vector-errors*)
+ (<fx *par-open* (vector-length *vector-errors*)))
+ (let ((pos (input-port-position (the-port))))
+ (vector-set! *vector-errors* *par-open* pos)))
+ ;; we increment the number of open parenthesis
+ (set! *par-open* (+fx 1 *par-open*))
+ (list->vector (reverse! (collect-up-to ignore "vector" (the-port)))))
+
+ ;; error or eof
+ (else
+ (let ((port (the-port))
+ (char (the-failure)))
+ (if (eof-object? char)
+ (cond
+ ((>fx *par-open* 0)
+ (let ((open-key (-fx *par-open* 1)))
+ (skribe-reader-reset!)
+ (if (and (<fx open-key (vector-length *list-errors*))
+ (fixnum? (vector-ref *list-errors* open-key)))
+ (error/location "skribe-read"
+ "Unclosed list"
+ char
+ (input-port-name port)
+ (vector-ref *list-errors* open-key))
+ (error "skribe-read"
+ "Unexpected end-of-file"
+ "Unclosed list"))))
+ (else
+ (reset-eof port)
+ char))
+ (error/location "skribe-read"
+ "Illegal char"
+ (illegal-char-rep char)
+ (input-port-name port)
+ (input-port-position port)))))))
+
+;*---------------------------------------------------------------------*/
+;* *text-grammar* ... */
+;* ------------------------------------------------------------- */
+;* The grammar that parses texts (the [...] forms). */
+;*---------------------------------------------------------------------*/
+(define *text-grammar*
+ (regular-grammar ()
+ ((: (* (out ",[]\\")) #\])
+ (let* ((port (the-port))
+ (name (input-port-name port))
+ (pos (input-port-position port))
+ (loc (make-at name pos))
+ (item (the-substring 0 (-fx (the-length) 1))))
+ (econs item '() loc)))
+ ((: (* (out ",[\\")) ",]")
+ (let* ((port (the-port))
+ (name (input-port-name port))
+ (pos (input-port-position port))
+ (loc (make-at name pos))
+ (item (the-substring 0 (-fx (the-length) 1))))
+ (econs item '() loc)))
+ ((: (* (out ",[]\\")) #\,)
+ (let* ((port (the-port))
+ (name (input-port-name port))
+ (pos (input-port-position port))
+ (loc (make-at name pos))
+ (item (the-substring 0 (-fx (the-length) 1)))
+ (sexp (read/rp *sexp-grammar* (the-port)))
+ (rest (ignore)))
+ (if (string=? item "")
+ (cons (list 'unquote sexp) rest)
+ (econs item (cons (list 'unquote sexp) rest) loc))))
+ ((or (+ (out ",[]\\"))
+ (+ #\Newline)
+ (: (* (out ",[]\\")) #\, (out "([]\\")))
+ (let* ((port (the-port))
+ (name (input-port-name port))
+ (pos (input-port-position port))
+ (loc (make-at name pos))
+ (item (the-string))
+ (rest (ignore)))
+ (econs item rest loc)))
+ ("\\\\"
+ (cons "\\" (ignore)))
+ ("\\n"
+ (cons "\n" (ignore)))
+ ("\\t"
+ (cons "\t" (ignore)))
+ ("\\]"
+ (cons "]" (ignore)))
+ ("\\["
+ (cons "[" (ignore)))
+ ("\\,"
+ (cons "," (ignore)))
+ (#\\
+ (cons "\\" (ignore)))
+ (else
+ (let ((c (the-failure))
+ (port (the-port)))
+ (define (err msg)
+ (error/location "skribe-read-text"
+ msg
+ (the-failure)
+ (input-port-name port)
+ (input-port-position port)))
+ (cond
+ ((eof-object? c)
+ (err "Illegal `end of file'"))
+ ((char=? c #\[)
+ (err "Illegal nested `[...]' form"))
+ (else
+ (err "Illegal string character")))))))
+
+;*---------------------------------------------------------------------*/
+;* skribe-read ... */
+;*---------------------------------------------------------------------*/
+(define (skribe-read . input-port)
+ (cond
+ ((null? input-port)
+ (read/rp *sexp-grammar* (current-input-port)))
+ ((not (input-port? (car input-port)))
+ (error "read" "type `input-port' expected" (car input-port)))
+ (else
+ (let ((port (car input-port)))
+ (if (closed-input-port? port)
+ (error "read" "Illegal closed input port" port)
+ (read/rp *sexp-grammar* port))))))
+
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