X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/2392e488500d311472fef01d2226b5a15e5ca65e..cfbd2831807822f12fa32c781d50f54a6a2ea91d:/src/parser/scanner-impl.lisp

diff --git a/src/parser/scanner-impl.lisp b/src/parser/scanner-impl.lisp
index 8bca29f..411cbc1 100644
--- a/src/parser/scanner-impl.lisp
+++ b/src/parser/scanner-impl.lisp
@@ -61,14 +61,18 @@
 (export '(string-scanner make-string-scanner string-scanner-p))
 (defstruct (string-scanner
 	     (:constructor make-string-scanner
-		 (string &key (start 0) end
+		 (string
+		  &key (start 0) end filename
 		  &aux (%string string)
 		       (index start)
 		       (limit (or end (length string))))))
   "Scanner structure for a simple string scanner."
   (%string "" :type string :read-only t)
+  (filename "<string>" :type string :read-only t)
   (index 0 :type (and fixnum unsigned-byte))
-  (limit nil :type (and fixnum unsigned-byte) :read-only t))
+  (limit nil :type (and fixnum unsigned-byte) :read-only t)
+  (line 1 :type fixnum)
+  (column 0 :type fixnum))
 (define-access-wrapper string-scanner-string string-scanner-%string
 		       :read-only t)
 
@@ -79,10 +83,33 @@
   (char (string-scanner-string scanner) (string-scanner-index scanner)))
 
 (defmethod scanner-step ((scanner string-scanner))
-  (incf (string-scanner-index scanner)))
+  (let ((index (string-scanner-index scanner)))
+    (setf (values (string-scanner-line scanner)
+		  (string-scanner-column scanner))
+	  (update-position (char (string-scanner-string scanner) index)
+			   (string-scanner-line scanner)
+			   (string-scanner-column scanner))
+	  (string-scanner-index scanner) (1+ index))))
 
 (defmethod scanner-unread ((scanner string-scanner) char)
-  (decf (string-scanner-index scanner)))
+  (let ((index (1- (string-scanner-index scanner))))
+    (setf (values (string-scanner-line scanner)
+		  (string-scanner-column scanner))
+	  (backtrack-position (char (string-scanner-string scanner) index)
+			      (string-scanner-line scanner)
+			      (string-scanner-column scanner))
+	  (string-scanner-index scanner) index)))
+
+(defmethod scanner-filename ((scanner string-scanner))
+  (string-scanner-filename scanner))
+(defmethod scanner-line ((scanner string-scanner))
+  (string-scanner-line scanner))
+(defmethod scanner-column ((scanner string-scanner))
+  (string-scanner-column scanner))
+(defmethod file-location ((scanner string-scanner))
+  (make-file-location (string-scanner-filename scanner)
+		      (string-scanner-line scanner)
+		      (string-scanner-column scanner)))
 
 (defmethod scanner-capture-place ((scanner string-scanner))
   (string-scanner-index scanner))