X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/sod/blobdiff_plain/2cbdee3da3cb73df67faf1d90823966b8b41388d..311141120e0fe0196f05861285d71472c5e91e02:/src/module-parse.lisp

diff --git a/src/module-parse.lisp b/src/module-parse.lisp
index 0713b76..fb60b49 100644
--- a/src/module-parse.lisp
+++ b/src/module-parse.lisp
@@ -7,7 +7,7 @@
 
 ;;;----- 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
@@ -31,48 +31,63 @@ (in-package #:sod)
 ;;; Type names.
 
 (define-pluggable-parser module typename (scanner pset)
-  ;; `typename' id ( `,' id )* `;'
+  ;; `typename' list[id] `;'
   (declare (ignore pset))
   (with-parser-context (token-scanner-context :scanner scanner)
     (parse (and "typename"
-		(skip-many (:min 1)
-		  (seq ((id :id))
-		    (if (gethash id *module-type-map*)
-			(cerror* "Type `~A' already defined" id)
-			(add-to-module *module*
-				       (make-instance 'type-item
-						      :name id))))
+		(skip-many ()
+		  (error ()
+		      (seq ((id :id))
+			(if (or (gethash id *module-type-map*)
+				(find-simple-c-type id))
+			    (cerror* "Type `~A' already defined" id)
+			    (add-to-module *module*
+					   (make-instance 'type-item
+							  :name id))))
+		    (skip-until () #\, #\;))
 		  #\,)
-		#\;))))
+		(must #\;)))))
 
 ;;; Fragments.
 
 (define-pluggable-parser module code (scanner pset)
-  ;; `code' id `:' id [constraints] `{' c-fragment `}'
+  ;; `code' id `:' item-name [constraints] `{' c-fragment `}'
   ;;
-  ;; constrains ::= `[' constraint-list `]'
-  ;; constraint ::= id+
+  ;; constraints ::= `[' list[constraint] `]'
+  ;; constraint ::= item-name+
+  ;; item-name ::= id | `(' id+ `)'
   (declare (ignore pset))
   (with-parser-context (token-scanner-context :scanner scanner)
-    (flet ((kw ()
-	     (parse (seq ((kw :id)) (intern (string-upcase kw) 'keyword)))))
+    (labels ((kw ()
+	       (parse (seq ((kw :id))
+			(intern (frob-identifier kw) 'keyword))))
+	     (item ()
+	       (parse (or (kw)
+			  (seq (#\( (names (list (:min 1) (kw))) #\))
+			    names)))))
       (parse (seq ("code"
-		   (reason (kw))
-		   #\:
-		   (name (kw))
+		   (reason (must (kw)))
+		   (nil (must #\:))
+		   (name (must (item)))
 		   (constraints (? (seq (#\[
-					 (constraints (list (:min 1)
-							(list (:min 1) (kw))
-							#\,))
+					 (constraints
+					  (list ()
+					    (list (:min 1)
+					      (error (:ignore-unconsumed t)
+						  (item)
+						(skip-until ()
+						  :id #\( #\, #\])))
+					    #\,))
 					 #\])
 				     constraints)))
 		   (fragment (parse-delimited-fragment scanner #\{ #\})))
-	       (add-to-module *module*
-			      (make-instance 'code-fragment-item
-					     :fragment fragment
-					     :constraints constraints
-					     :reason reason
-					     :name name)))))))
+	       (when name
+		 (add-to-module *module*
+				(make-instance 'code-fragment-item
+					       :fragment fragment
+					       :constraints constraints
+					       :reason reason
+					       :name name))))))))
 
 ;;; External files.
 
@@ -94,23 +109,30 @@ (defun read-module (pathname &key (truename nil truep) location)
   (define-module (pathname :location location :truename truename)
     (with-open-file (f-stream pathname :direction :input)
       (let* ((*readtable* (copy-readtable))
+	     (*package* (find-package '#:sod-user))
 	     (char-scanner (make-instance 'charbuf-scanner
-					  :stream f-stream))
+					  :stream f-stream
+					  :filename (namestring pathname)))
 	     (scanner (make-instance 'sod-token-scanner
 				     :char-scanner char-scanner)))
 	(with-default-error-location (scanner)
 	  (with-parser-context (token-scanner-context :scanner scanner)
-	    (parse (skip-many ()
-		     (seq ((pset (parse-property-set scanner))
-			   (nil (error ()
-				  (plug module scanner pset))))
-		       (check-unused-properties pset))))))))))
+	    (multiple-value-bind (result winp consumedp)
+		(parse (skip-many ()
+			  (seq ((pset (parse-property-set scanner))
+				(nil (error ()
+					 (plug module scanner pset)
+				       (skip-until (:keep-end nil)
+					 #\; #\}))))
+			    (check-unused-properties pset))))
+	      (declare (ignore consumedp))
+	      (unless winp (syntax-error scanner result)))))))))
 
 (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) #\;)
+    (parse (seq ("demo" (string (must :string)) (nil (must #\;)))
 	     (format t ";; DEMO ~S~%" string)))))
 
 (define-pluggable-parser module file (scanner pset)
@@ -118,14 +140,15 @@ (define-pluggable-parser module file (scanner pset)
   ;; `load' string `;'
   (declare (ignore pset))
   (flet ((common (name type what thunk)
-	   (find-file scanner
-		      (merge-pathnames name
-				       (make-pathname :type type
-						      :case :common))
-		      what
-		      thunk)))
+	   (when name
+	     (find-file scanner
+			(merge-pathnames name
+					 (make-pathname :type type
+							:case :common))
+			what
+			thunk))))
     (with-parser-context (token-scanner-context :scanner scanner)
-      (parse (or (seq ("import" (name :string) #\;)
+      (parse (or (seq ("import" (name (must :string)) (nil (must #\;)))
 		   (common name "SOD" "module"
 			   (lambda (path true)
 			     (handler-case
@@ -138,8 +161,12 @@ (define-pluggable-parser module file (scanner pset)
 					       *module*))))
 			       (file-error (error)
 				 (cerror* "Error reading module ~S: ~A"
+					  path error))
+			       (error (error)
+				 (cerror* "Unexpected error reading ~
+					   module ~S: ~A"
 					  path error))))))
-		 (seq ("load" (name :string) #\;)
+		 (seq ("load" (name (must :string)) (nil (must #\;)))
 		   (common name "LISP" "Lisp file"
 			   (lambda (path true)
 			     (handler-case
@@ -148,6 +175,29 @@ (define-pluggable-parser module file (scanner pset)
 				 (cerror* "Error loading Lisp file ~S: ~A"
 					  path error)))))))))))
 
+;;; Setting properties.
+
+(define-pluggable-parser module set (scanner pset)
+  ;; `set' list[property] `;'
+  (with-parser-context (token-scanner-context :scanner scanner)
+    (parse (and "set"
+		(lisp (let ((module-pset (module-pset *module*)))
+			(when pset
+			  (pset-map (lambda (prop)
+				      (add-property
+				       module-pset
+				       (p-name prop) (p-value prop)
+				       :type (p-type prop)
+				       :location (p-location prop))
+				      (setf (p-seenp prop) t))
+				    pset))
+			(parse (skip-many (:min (if pset 0 1))
+				 (error (:ignore-unconsumed t)
+				     (parse-property scanner module-pset)
+				   (skip-until () #\, #\;))
+				 #\,))))
+		#\;))))
+
 ;;; Lisp escape.
 
 (define-pluggable-parser module lisp (scanner pset)
@@ -161,38 +211,89 @@ (define-pluggable-parser module lisp (scanner pset)
 			     (scanner-step scanner)
 			     (values sexp t t))
 			   (values '((:id "lisp")) nil nil)))
-		 #\;)
+		 (nil (must #\;)))
 	     (eval sexp)))))
 
 ;;;--------------------------------------------------------------------------
 ;;; Class declarations.
 
+(export 'class-item)
+
+(define-pluggable-parser class-item initfrags (scanner class pset)
+  ;; raw-class-item ::= frag-keyword `{' c-fragment `}'
+  ;; frag-keyword ::= `init' | `teardown'
+  (with-parser-context (token-scanner-context :scanner scanner)
+    (parse (seq ((make (or (seq ("init") #'make-sod-class-initfrag)
+			   (seq ("teardown") #'make-sod-class-tearfrag)))
+		 (frag (parse-delimited-fragment scanner #\{ #\})))
+	     (funcall make class frag pset scanner)))))
+
+(define-pluggable-parser class-item initargs (scanner class pset)
+  ;; initarg-item ::= `initarg' declspec+ list[init-declarator]
+  ;; init-declarator ::= declarator [`=' initializer]
+  (with-parser-context (token-scanner-context :scanner scanner)
+    (parse (seq ("initarg"
+		 (base-type (parse-c-type scanner))
+		 (nil (skip-many (:min 1)
+			(seq ((declarator (parse-declarator scanner
+							    base-type))
+			      (init (? (parse-delimited-fragment
+					scanner #\= (list #\; #\,)
+					:keep-end t))))
+			  (make-sod-user-initarg class
+						 (cdr declarator)
+						 (car declarator)
+						 pset init scanner))
+			#\,))
+		 (nil (must #\;)))))))
+
+(defun synthetic-name ()
+  "Return an obviously bogus synthetic not-identifier."
+  (let ((ix *temporary-index*))
+    (incf *temporary-index*)
+    (make-instance 'temporary-variable :tag (format nil "%%#~A" ix))))
+
 (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)
+    (when name (make-class-type name))
+    (let* ((duff (null name))
+	   (synthetic-name (or name
+			       (let ((var (synthetic-name)))
+				 (unless pset
+				   (setf pset (make-property-set)))
+				 (unless (pset-get pset "nick")
+				   (add-property pset "nick" var :type :id))
+				 var)))
+	   (class (make-sod-class synthetic-name
+				  (restart-case
+				      (mapcar #'find-sod-class
+					      (or supers (list "SodObject")))
+				    (continue ()
+				      (setf duff t)
+				      (list (find-sod-class "SodObject"))))
 				  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
+      (labels ((parse-maybe-dotted-name ()
+		 ;; maybe-dotted-name ::= [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 (seq ((name-a :id)
+			      (name-b (? (seq (#\. (id :id)) id))))
+			  (if name-b (cons name-a name-b)
+			      name-a))))
+
+	       (parse-maybe-dotted-declarator (base-type)
+		 ;; Parse a declarator or dotted-declarator, i.e., one whose
+		 ;; centre is maybe-dotted-name above.
+		 (parse-declarator scanner base-type
+				   :keywordp t
+				   :kernel #'parse-maybe-dotted-name))
 
 	       (parse-message-item (sub-pset type name)
 		 ;; message-item ::=
@@ -216,97 +317,64 @@ (defun parse-class-body (scanner pset name supers)
 		 (parse (seq ((body (or (seq ("extern" #\;) nil)
 					(parse-delimited-fragment
 					 scanner #\{ #\}))))
-			  (make-sod-method class sub-nick name type
-					   body sub-pset scanner))))
+			  (restart-case
+			      (make-sod-method class sub-nick name type
+					       body sub-pset scanner)
+			    (continue () :report "Continue")))))
 
 	       (parse-initializer ()
-		 ;; initializer ::= `=' c-fragment | `=' `{' c-fragment `}'
+		 ;; initializer ::= `=' 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)))))))
+		 ;; Return a VALUE, ready for passing to a `sod-initializer'
+		 ;; constructor.
+		 (parse-delimited-fragment scanner #\= '(#\, #\;)
+					   :keep-end t))
 
 	       (parse-slot-item (sub-pset base-type type name)
 		 ;; slot-item ::=
 		 ;;	declspec+ declarator -!- [initializer]
-		 ;;		[`,' init-declarator-list] `;'
+		 ;;		[`,' list[init-declarator]] `;'
 		 ;;
-		 ;; 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)
+		 ;; init-declarator ::=	declarator [initializer]
+		 (flet ((make-it (name type init)
+			  (restart-case
+			      (progn
+				(make-sod-slot class name type
+					       sub-pset scanner)
+				(when init
+				  (make-sod-instance-initializer class
+								 nick name
+								 init
+								 sub-pset
+								 scanner)))
+			    (continue () :report "Continue"))))
+		   (parse (and (seq ((init (? (parse-initializer))))
+				 (make-it name type init))
+			       (skip-many ()
+				 (seq (#\,
+				       (ds (parse-declarator scanner
+							     base-type))
+				       (init (? (parse-initializer))))
+				   (make-it (cdr ds) (car ds) init)))
+			       #\;))))
+
+	       (parse-initializer-item (sub-pset must-init-p constructor)
 		 ;; initializer-item ::=
-		 ;;	[`class'] -!- slot-initializer-list `;'
+		 ;;	[`class'] -!- list[slot-initializer] `;'
 		 ;;
-		 ;; 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))
-			       #\,)
-			     #\;)))
+		 ;; slot-initializer ::= id `.' id [initializer]
+		 (let ((parse-init (if must-init-p #'parse-initializer
+				       (parser () (? (parse-initializer))))))
+		   (parse (and (skip-many ()
+				 (seq ((name-a :id) #\. (name-b :id)
+				       (init (funcall parse-init)))
+				   (restart-case
+				       (funcall constructor class
+						name-a name-b init
+						sub-pset scanner)
+				     (continue () :report "Continue")))
+				 #\,)
+			       #\;))))
 
 	       (class-item-dispatch (sub-pset base-type type name)
 		 ;; Logically part of `parse-raw-class-item', but the
@@ -320,9 +388,8 @@ (defun parse-class-body (scanner pset name supers)
 		 ;; 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.")
+			  (cerror*
+			   "Method declarations must have function type")
 			  (setf name (cdr name)))
 			(parse-slot-item sub-pset base-type type name))
 		       ((consp name)
@@ -337,24 +404,24 @@ (defun parse-class-body (scanner pset name supers)
 		 ;;   | method-item
 		 ;;   | slot-item
 		 ;;   | initializer-item
+		 ;;   | initfrag-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
+			    (peek
 			     (seq ((ds (parse-c-type scanner))
 				   (dc (parse-maybe-dotted-declarator ds))
+				   (nil (commit))
 				   (nil (class-item-dispatch sub-pset
 							     ds
 							     (car dc)
-							     (cdr dc)))));)
+							     (cdr dc))))))
 			    (and "class"
-				 (parse-initializer-item
-				  sub-pset
+				 (parse-initializer-item sub-pset t
 				  #'make-sod-class-initializer))
-			    (parse-initializer-item
-			     sub-pset
+			    (parse-initializer-item sub-pset nil
 			     #'make-sod-instance-initializer)))))
 
 	(parse (seq (#\{
@@ -363,19 +430,22 @@ (defun parse-class-body (scanner pset name supers)
 				  (nil (parse-raw-class-item sub-pset)))
 			      (check-unused-properties sub-pset))))
 		     (nil (error () #\})))
-		 (finalize-sod-class class)
-		 (add-to-module *module* class)))))))
+		 (unless (finalize-sod-class class)
+		   (setf duff t))
+		 (unless duff
+		   (add-to-module *module* class))))))))
 
 (define-pluggable-parser module class (scanner pset)
-  ;; `class' id [`:' id-list] class-body
+  ;; `class' id `:' list[id] class-body
   ;; `class' id `;'
   (with-parser-context (token-scanner-context :scanner scanner)
     (parse (seq ("class"
-		 (name :id)
+		 (name (must :id))
 		 (nil (or (seq (#\;)
-			    (make-class-type name))
-			  (seq ((supers (? (seq (#\: (ids (list () :id #\,)))
-					     ids)))
+			    (when name (make-class-type name)))
+			  (seq ((supers (must (seq (#\:
+						    (ids (list () :id #\,)))
+						ids)))
 				(nil (parse-class-body
 				      scanner
 				      pset name supers)))))))))))