X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~mdw/git/sod/blobdiff_plain/4fd69126f8b52945e0a572d1cf4a347468c1ced5..60529354d9cf7b479605366b103517af44927e02:/src/final.lisp

diff --git a/src/final.lisp b/src/final.lisp
index 1b87c26..8cd42f8 100644
--- a/src/final.lisp
+++ b/src/final.lisp
@@ -39,16 +39,27 @@ (export '*debugout-pathname*)
 (defvar *debugout-pathname* #p"debugout.c")
 
 (export 'test-module)
-(defun test-module (path reason)
-  "Reset the translator's state, read a module from PATH and output it with
-   REASON, returning the result as a string."
-  (clear-the-decks)
-  (setf *module-map* (make-hash-table :test #'equal))
-  (with-open-file (out *debugout-pathname*
-		   :direction :output
-		   :if-exists :supersede
-		   :if-does-not-exist :create)
-    (output-module (read-module path) reason out)))
+(defun test-module (path &key reason clear backtrace)
+  "Read a module from PATH, to exercise the machinery.
+
+   If CLEAR is non-nil, then reset the translator's state before proceeding.
+
+   If REASON is non-nil, then output the module to `*debugout-pathname*' with
+   that REASON.
+
+   Return a two-element list (NERROR NWARNING) of the number of errors and
+   warnings encountered while processing the module."
+  (when clear (clear-the-decks))
+  (multiple-value-bind (module nerror nwarning)
+      (if backtrace (read-module path)
+	  (count-and-report-errors () (read-module path)))
+    (when (and module reason)
+      (with-open-file (out *debugout-pathname*
+		       :direction :output
+		       :if-exists :supersede
+		       :if-does-not-exist :create)
+	(output-module module reason out)))
+    (list nerror nwarning)))
 
 (export 'test-parse-c-type)
 (defun test-parse-c-type (string)
@@ -74,29 +85,47 @@ (defun test-parse-c-type (string)
 	      (values nil value)))))))
 
 (export 'test-parser)
-(defmacro test-parser ((scanner &key) parser input)
+(defmacro test-parser ((scanner &key backtrace) parser input)
   "Convenient macro for testing parsers at the REPL.
 
    This is a macro so that the parser can use the fancy syntax.  The name
    SCANNER is bound to a `sod-token-scanner' reading tokens from the INPUT
-   string.  Then the PARSER is invoked and three values are returned: a
-   `successp' flag indicating whether the parser succeeded; the result,
-   output or error indicator, of the parser; and a list consisting of the
-   lookahead token type and value, and a string containing the untokenized
-   remaining input."
+   string.  Then the PARSER is invoked and three values are returned: the
+   result of the parse, or `nil' if the main parse failed; a list containing
+   the number of errors and warnings (respectively) reported during the
+   parse; and a list consisting of the lookahead token type and value, and a
+   string containing the untokenized remaining input.
+
+   If BACKTRACE is nil (the default) then leave errors to the calling
+   environment to sort out (e.g., by entering the Lisp debugger); otherwise,
+   catch and report them as they happen so that you can test error recovery
+   strategies."
   (once-only (input)
-    (with-gensyms (char-scanner value winp consumedp where)
-      `(let* ((,char-scanner (make-string-scanner ,input))
-	      (,scanner (make-instance 'sod-token-scanner
-				       :char-scanner ,char-scanner
-				       :filename "<test-input>")))
+    (with-gensyms (char-scanner value winp body consumedp where nerror nwarn)
+      `(let ((,char-scanner nil) (,scanner nil))
 	 (with-parser-context (token-scanner-context :scanner ,scanner)
-	   (multiple-value-bind (,value ,winp ,consumedp) (parse ,parser)
-	     (declare (ignore ,consumedp))
+	   (multiple-value-bind (,value ,nerror ,nwarn)
+	       (flet ((,body ()
+			(setf ,char-scanner (make-string-scanner ,input)
+			      ,scanner (make-instance
+					'sod-token-scanner
+					:char-scanner ,char-scanner))
+			(multiple-value-bind (,value ,winp ,consumedp)
+			    (parse ,parser)
+			  (declare (ignore ,consumedp))
+			  (cond (,winp ,value)
+				(t (syntax-error ,scanner ,value)
+				   nil)))))
+		 (if ,backtrace (,body)
+		     (count-and-report-errors ()
+		       (with-default-error-location (,scanner)
+			 (,body)))))
 	     (let ((,where (scanner-capture-place ,char-scanner)))
-	       (values ,winp ,value
-		       (list (token-type ,scanner) (token-value ,scanner)
-			     (subseq ,input ,where))))))))))
+	       (values ,value
+		       (list ,nerror ,nwarn)
+		       (and ,scanner (list (token-type ,scanner)
+					   (token-value ,scanner)
+					   (subseq ,input ,where)))))))))))
 
 ;;;--------------------------------------------------------------------------
 ;;; Calisthenics.
@@ -115,11 +144,15 @@ (defun exercise ()
    That's the theory anyway.  Call this function before you dump an image and
    see what happens."
 
-  (clear-the-decks)
   (dolist (reason '(:h :c))
     (with-output-to-string (bitbucket)
       (output-module *builtin-module* reason bitbucket)))
 
   (clear-the-decks))
 
+;;;--------------------------------------------------------------------------
+;;; Make sure things work after loading the system.
+
+(clear-the-decks)
+
 ;;;----- That's all, folks --------------------------------------------------