;;;----- Licensing notice ---------------------------------------------------
;;;
-;;; This file is part of the Sensble Object Design, an object system for C.
+;;; This file is part of the Sensible Object Design, an object system for C.
;;;
;;; SOD is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;;--------------------------------------------------------------------------
;;; Toplevel syntax.
-(export 'module)
-
;;; Type names.
-(define-pluggable-parser module typename (scanner)
- ;; `typename' ID ( `,' ID )* `;'
-
+(define-pluggable-parser module typename (scanner pset)
+ ;; `typename' id ( `,' id )* `;'
+ (declare (ignore pset))
(with-parser-context (token-scanner-context :scanner scanner)
(parse (and "typename"
(skip-many (:min 1)
;;; Fragments.
-(define-pluggable-parser module code (scanner)
- ;; `code' ID `:' ID [ CONSTRAINTS ] `{' C-FRAGMENT `}'
-
+(define-pluggable-parser module code (scanner pset)
+ ;; `code' id `:' id [constraints] `{' c-fragment `}'
+ ;;
+ ;; constrains ::= `[' constraint-list `]'
+ ;; constraint ::= id+
+ (declare (ignore pset))
(with-parser-context (token-scanner-context :scanner scanner)
- (parse (seq ("code"
- (reason :id)
- #\:
- (name :id)
- (constraints (? (seq (#\[
- (constraints (list (:min 1)
- (list (:min 1) :id)
- #\,))
- #\])
- constraints)))
- (fragment (parse-delimited-fragment scanner #\{ #\})))
- (add-to-module *module* (make-instance 'code-fragment-item
- :fragment fragment
- :constraints constraints
- :reason reason
- :name name))))))
+ (flet ((kw ()
+ (parse (seq ((kw :id)) (intern (string-upcase kw) 'keyword)))))
+ (parse (seq ("code"
+ (reason (kw))
+ #\:
+ (name (kw))
+ (constraints (? (seq (#\[
+ (constraints (list (:min 1)
+ (list (:min 1) (kw))
+ #\,))
+ #\])
+ constraints)))
+ (fragment (parse-delimited-fragment scanner #\{ #\})))
+ (add-to-module *module*
+ (make-instance 'code-fragment-item
+ :fragment fragment
+ :constraints constraints
+ :reason reason
+ :name name)))))))
;;; External files.
-(defun read-module (pathname &key (truename (truename pathname)) location)
+(export 'read-module)
+(defun read-module (pathname &key (truename nil truep) location)
"Parse the file at PATHNAME as a module, returning it.
This is the main entry point for parsing module files. You may well know
`file-location' object, though it might be anything other than `t' which
can be printed in the event of circular imports."
+ (setf pathname (merge-pathnames pathname
+ (make-pathname :type "SOD" :case :common)))
+ (unless truep (setf truename (truename pathname)))
(define-module (pathname :location location :truename truename)
(with-open-file (f-stream pathname :direction :input)
(let* ((*readtable* (copy-readtable))
:char-scanner char-scanner)))
(with-default-error-location (scanner)
(with-parser-context (token-scanner-context :scanner scanner)
- (parse (skip-many () (plug module scanner)))))))))
-
-(define-pluggable-parser module test (scanner)
- ;; `demo' STRING `;'
+ (parse (skip-many ()
+ (seq ((pset (parse-property-set scanner))
+ (nil (error ()
+ (plug module scanner pset))))
+ (check-unused-properties pset))))))))))
+(define-pluggable-parser module test (scanner pset)
+ ;; `demo' string `;'
+ (declare (ignore pset))
(with-parser-context (token-scanner-context :scanner scanner)
(parse (seq ("demo" (string :string) #\;)
(format t ";; DEMO ~S~%" string)))))
-(define-pluggable-parser module file (scanner)
- ;; `import' STRING `;'
- ;; `load' STRING `;'
-
+(define-pluggable-parser module file (scanner pset)
+ ;; `import' string `;'
+ ;; `load' string `;'
+ (declare (ignore pset))
(flet ((common (name type what thunk)
(find-file scanner
(merge-pathnames name
;;; Lisp escape.
-(define-pluggable-parser module lisp (scanner)
+(define-pluggable-parser module lisp (scanner pset)
;; `lisp' s-expression `;'
-
+ (declare (ignore pset))
(with-parser-context (token-scanner-context :scanner scanner)
(parse (seq ((sexp (if (and (eql (token-type scanner) :id)
(string= (token-value scanner) "lisp"))
;;;--------------------------------------------------------------------------
;;; Class declarations.
-(define-pluggable-parser module class (scanner)
- ;; `class' id [`:' id-list] `{' class-item* `}'
+(export 'class-item)
+
+(defun parse-class-body (scanner pset name supers)
+ ;; class-body ::= `{' class-item* `}'
+ ;;
+ ;; class-item ::= property-set raw-class-item
+ (with-parser-context (token-scanner-context :scanner scanner)
+ (make-class-type name)
+ (let* ((class (make-sod-class name (mapcar #'find-sod-class supers)
+ pset scanner))
+ (nick (sod-class-nickname class)))
+
+ (labels ((parse-maybe-dotted-declarator (base-type)
+ ;; Parse a declarator or dotted-declarator, i.e., one whose
+ ;; centre is
+ ;;
+ ;; maybe-dotted-identifier ::= [id `.'] id
+ ;;
+ ;; A plain identifier is returned as a string, as usual; a
+ ;; dotted identifier is returned as a cons cell of the two
+ ;; names.
+ (parse-declarator
+ scanner base-type
+ :kernel (parser ()
+ (seq ((name-a :id)
+ (name-b (? (seq (#\. (id :id)) id))))
+ (if name-b (cons name-a name-b)
+ name-a)))))
+
+ (parse-message-item (sub-pset type name)
+ ;; message-item ::=
+ ;; declspec+ declarator -!- (method-body | `;')
+ ;;
+ ;; Don't allow a method-body here if the message takes a
+ ;; varargs list, because we don't have a name for the
+ ;; `va_list' parameter.
+ (let ((message (make-sod-message class name type
+ sub-pset scanner)))
+ (if (varargs-message-p message)
+ (parse #\;)
+ (parse (or #\; (parse-method-item sub-pset
+ type nick name))))))
+
+ (parse-method-item (sub-pset type sub-nick name)
+ ;; method-item ::=
+ ;; declspec+ dotted-declarator -!- method-body
+ ;;
+ ;; method-body ::= `{' c-fragment `}' | `extern' `;'
+ (parse (seq ((body (or (seq ("extern" #\;) nil)
+ (parse-delimited-fragment
+ scanner #\{ #\}))))
+ (make-sod-method class sub-nick name type
+ body sub-pset scanner))))
+
+ (parse-initializer ()
+ ;; initializer ::= `=' c-fragment | `=' `{' c-fragment `}'
+ ;;
+ ;; Return (VALUE-KIND . VALUE-FORM), ready for passing to a
+ ;; `sod-initializer' constructor.
+
+ ;; This is kind of tricky because we have to juggle both
+ ;; layers of the parsing machinery. The character scanner
+ ;; will already have consumed the lookahead token (which, if
+ ;; we're going to do anything, is `=').
+ (let ((char-scanner (token-scanner-char-scanner scanner)))
+
+ ;; First, skip the character-scanner past any whitespace.
+ ;; We don't record this consumption, which is a bit
+ ;; naughty, but nobody will actually mind.
+ (loop
+ (when (or (scanner-at-eof-p char-scanner)
+ (not (whitespace-char-p
+ (scanner-current-char char-scanner))))
+ (return))
+ (scanner-step char-scanner))
+
+ ;; Now maybe read an initializer.
+ (cond ((not (eql (token-type scanner) #\=))
+ ;; It's not an `=' after all. There's no
+ ;; initializer.
+ (values '(#\=) nil nil))
+
+ ((and (not (scanner-at-eof-p char-scanner))
+ (char= (scanner-current-char char-scanner)
+ #\{))
+ ;; There's a brace after the `=', so we should
+ ;; consume the `=' here, and read a compound
+ ;; initializer enclosed in braces.
+ (parse (seq (#\= (frag (parse-delimited-fragment
+ scanner #\{ #\})))
+ (cons :compound frag))))
+
+ (t
+ ;; No brace, so read from the `=' up to, but not
+ ;; including, the trailing `,' or `;' delimiter.
+ (parse (seq ((frag (parse-delimited-fragment
+ scanner #\= '(#\; #\,)
+ :keep-end t)))
+ (cons :simple frag)))))))
+
+ (parse-slot-item (sub-pset base-type type name)
+ ;; slot-item ::=
+ ;; declspec+ declarator -!- [initializer]
+ ;; [`,' init-declarator-list] `;'
+ ;;
+ ;; init-declarator-list ::=
+ ;; declarator [initializer] [`,' init-declarator-list]
+ (parse (and (seq ((init (? (parse-initializer))))
+ (make-sod-slot class name type
+ sub-pset scanner)
+ (when init
+ (make-sod-instance-initializer
+ class nick name (car init) (cdr init)
+ sub-pset scanner)))
+ (skip-many ()
+ (seq (#\,
+ (ds (parse-declarator scanner
+ base-type))
+ (init (? (parse-initializer))))
+ (make-sod-slot class (cdr ds) (car ds)
+ sub-pset scanner)
+ (when init
+ (make-sod-instance-initializer
+ class nick (cdr ds)
+ (car init) (cdr init)
+ sub-pset scanner))))
+ #\;)))
+
+ (parse-initializer-item (sub-pset constructor)
+ ;; initializer-item ::=
+ ;; [`class'] -!- slot-initializer-list `;'
+ ;;
+ ;; slot-initializer ::= id `.' id initializer
+ (parse (and (skip-many ()
+ (seq ((name-a :id) #\. (name-b :id)
+ (init (parse-initializer)))
+ (funcall constructor class
+ name-a name-b
+ (car init) (cdr init)
+ sub-pset scanner))
+ #\,)
+ #\;)))
+
+ (class-item-dispatch (sub-pset base-type type name)
+ ;; Logically part of `parse-raw-class-item', but the
+ ;; indentation was getting crazy. We're currently at
+ ;;
+ ;; raw-class-item ::=
+ ;; declspec+ (declarator | dotted-declarator) -!- ...
+ ;; | other-items
+ ;;
+ ;; If the declarator is dotted then this must be a method
+ ;; definition; otherwise it might be a message or slot.
+ (cond ((not (typep type 'c-function-type))
+ (when (consp name)
+ (cerror*-with-location
+ scanner
+ "Method declarations must have function type.")
+ (setf name (cdr name)))
+ (parse-slot-item sub-pset base-type type name))
+ ((consp name)
+ (parse-method-item sub-pset type
+ (car name) (cdr name)))
+ (t
+ (parse-message-item sub-pset type name))))
+
+ (parse-raw-class-item (sub-pset)
+ ;; raw-class-item ::=
+ ;; message-item
+ ;; | method-item
+ ;; | slot-item
+ ;; | initializer-item
+ ;;
+ ;; Most of the above begin with declspecs and a declarator
+ ;; (which might be dotted). So we parse that here and
+ ;; dispatch based on what we find.
+ (parse (or (plug class-item scanner class sub-pset)
+ (peek
+ (seq ((ds (parse-c-type scanner))
+ (dc (parse-maybe-dotted-declarator ds))
+ (nil (class-item-dispatch sub-pset
+ ds
+ (car dc)
+ (cdr dc))))))
+ (and "class"
+ (parse-initializer-item
+ sub-pset
+ #'make-sod-class-initializer))
+ (parse-initializer-item
+ sub-pset
+ #'make-sod-instance-initializer)))))
+
+ (parse (seq (#\{
+ (nil (skip-many ()
+ (seq ((sub-pset (parse-property-set scanner))
+ (nil (parse-raw-class-item sub-pset)))
+ (check-unused-properties sub-pset))))
+ (nil (error () #\})))
+ (finalize-sod-class class)
+ (add-to-module *module* class)))))))
+(define-pluggable-parser module class (scanner pset)
+ ;; `class' id [`:' id-list] class-body
+ ;; `class' id `;'
(with-parser-context (token-scanner-context :scanner scanner)
(parse (seq ("class"
(name :id)
- (supers (? (seq (#\: (supers (list (:min 1) :id #\,)))
- supers)))
- #\{
-
+ (nil (or (seq (#\;)
+ (make-class-type name))
+ (seq ((supers (? (seq (#\: (ids (list () :id #\,)))
+ ids)))
+ (nil (parse-class-body
+ scanner
+ pset name supers)))))))))))
;;;----- That's all, folks --------------------------------------------------
~mdw / sod / blobdiff