nyacc: more CPP fixes

module/nyacc/ChangeLog

@@ -1,3 +1,10 @@
+2017-01-18  Matt Wette  <mwette@alumni.caltech.edu>
+
+	* lang/c99/parser.scm: check for EOF in end of CPP line
+
+	* lang/c99/mach.scm (c99-spec): decl for translation unit was
+	updated to allow programs with no declarations or statements
+
 2017-01-08  Matt Wette  <mwette@alumni.caltech.edu>
 
 	* ../../test-suite/nyacc/lang/c99/exam.d/ex05.c: C99 does not
@@ -8,7 +15,7 @@
 	* lang/c99/body.scm (read-cpp-line): cpp statement should not
 	include newline?  Changed to unread final newline.
 
-	* lang/util.scm: add report-error: prints msg w/ file, line 
+	* lang/util.scm: add report-error: prints msg w/ file, line
 
 	* parse.scm (make-lalr-parser): changed printout of parse error to
 	(throw 'parse-error . args) and expect the full parser to catch

module/nyacc/lang/c99/body.scm

@@ -213,6 +213,7 @@
   (if (not (eq? ch #\#)) #f
       (let iter ((cl '()) (ch (read-char)))
 	(cond
+	 ((eof-object? ch) (throw 'cpp-error "CPP lines must end in newline"))
 	 ((eq? ch #\newline) (unread-char ch) (list->string (reverse cl)))
 	 ((eq? ch #\\)
 	  (let ((c2 (read-char)))
@@ -350,6 +351,7 @@
 	       (cond
 		((exec-cpp-stmts?)
 		 (let ((val (eval-cpp-cond-text (cadr stmt))))
+		   ;;(simple-format #t "if val=~S\n" val)
 		   (cond
 		    ((not val) (p-err "unresolved: ~S" (cadr stmt)))
 		    ((zero? val) (set! ppxs (cons* 'skip1-pop 'skip-look ppxs)))
@@ -397,6 +399,7 @@
 	      (else (cons 'cpp-stmt stmt))))
 	  
 	  (define (eval-cpp-line line)
+	    ;;(simple-format #t "eval-cpp-line: ~S\n" line)
 	    (with-throw-handler
 	     'cpp-error
 	     (lambda () (eval-cpp-stmt (read-cpp-stmt line)))
@@ -421,10 +424,12 @@
 		 ((read-comm ch bol) => assc-$)
 		 ((read-cpp ch) =>
 		  (lambda (res) ;; if '() stmt expanded so re-read
+		    ;;(simple-format #t "res=~S\n" res)
 		    (if (pair? res) (assc-$ res) (iter (read-char)))))
 		 (else (set! bol #f) (iter ch))))
 	       ((read-ident ch) =>
 		(lambda (name)
+		  ;;(simple-format #t "read-ident=>~S\n" name)
 		  (let ((symb (string->symbol name)))
 		    (cond
 		     ((and (x-def? name mode)

module/nyacc/lang/c99/cppbody.scm

@@ -163,6 +163,9 @@
       (((key . val) . rest)
        (iter (cons val stl) (cdr tkl)))
 
+      (('space . rest)
+       (iter (cons " " stl) rest))
+
       (((? char? ch) . rest)
        (iter (cons (string ch) stl) rest))
 
@@ -226,9 +229,13 @@
       (unread-char ch) (rtokl->string tkl))
      
      ((read-c-comm ch #f) =>
-      (lambda (cp) (iter (acons `comm cp tkl) lvl (read-char))))
+      (lambda (cp) (iter (acons `comm (cdr cp) tkl) lvl (read-char))))
+     
+     ((char-set-contains? c:ws ch)
+      (if (and (pair? tkl) (char? (car tkl)))
+	  (iter (cons 'space tkl) lvl (read-char))
+	  (iter tkl lvl (read-char))))
      
-     ((char-set-contains? c:ws ch) (iter tkl lvl (read-char)))
      ((char=? #\( ch) (iter (cons ch tkl) (1+ lvl) (read-char)))
      ((char=? #\) ch) (iter (cons ch tkl) (1- lvl) (read-char)))
      ((char=? #\# ch)

module/nyacc/lang/c99/mach.d/c99act.scm

@@ -699,8 +699,8 @@
    (lambda ($2 $1 . $rest) `(return (expr)))
    ;; translation-unit => external-declaration-list
    (lambda ($1 . $rest) (tl->list $1))
-   ;; external-declaration-list => external-declaration
-   (lambda ($1 . $rest) (make-tl 'trans-unit $1))
+   ;; external-declaration-list => 
+   (lambda $rest (make-tl 'trans-unit))
    ;; external-declaration-list => external-declaration-list external-decla...
    (lambda ($2 $1 . $rest)
      (if (eqv? (sx-tag $2) 'extern-block)

module/nyacc/lang/c99/mach.d/c99xact.scm

@@ -699,8 +699,8 @@
    (lambda ($2 $1 . $rest) `(return (expr)))
    ;; translation-unit => external-declaration-list
    (lambda ($1 . $rest) (tl->list $1))
-   ;; external-declaration-list => external-declaration
-   (lambda ($1 . $rest) (make-tl 'trans-unit $1))
+   ;; external-declaration-list => 
+   (lambda $rest (make-tl 'trans-unit))
    ;; external-declaration-list => external-declaration-list external-decla...
    (lambda ($2 $1 . $rest)
      (if (eqv? (sx-tag $2) 'extern-block)

module/nyacc/lang/c99/mach.d/c99xtab.scm

@@ -14,7 +14,7 @@
     2 1 1 1 1 2 2 4 2 1 2 1 1 3 1 3 2 5 6 4 5 2 1 3 1 3 1 1 1 1 2 1 1 3 5 4 4 
     3 6 6 5 4 4 4 3 2 1 3 2 1 2 1 3 1 3 2 2 1 1 3 2 1 1 2 1 3 5 4 4 3 6 5 6 4 
     3 3 2 5 4 5 4 3 4 3 3 2 1 1 3 4 2 1 4 3 2 1 2 3 2 1 1 1 1 1 1 1 3 4 3 3 2 
-    1 2 1 1 2 1 5 7 5 5 7 8 2 1 1 0 1 3 2 2 3 2 1 1 2 1 1 1 1 1 5 1 4 3 1 2 0 
+    1 2 1 1 2 1 5 7 5 5 7 8 2 1 1 0 1 3 2 2 3 2 1 0 2 1 1 1 1 1 5 1 4 3 1 2 0 
     1 1 1 1 1 1 1 2 1 1 1 1))
 
 (define pat-v

module/nyacc/lang/c99/mach.scm

@@ -609,7 +609,8 @@
      (external-declaration-list ($$ (tl->list $1)))
      )
     (external-declaration-list
-     (external-declaration ($$ (make-tl 'trans-unit $1)))
+     ;;(external-declaration ($$ (make-tl 'trans-unit $1)))
+     ($empty ($$ (make-tl 'trans-unit)))
      (external-declaration-list
       external-declaration
       ;; A ``kludge'' to deal with @code{extern "C" ...}: