Function: gud-pdb-marker-filter

gud-pdb-marker-filter is a byte-compiled function defined in gud.el.gz.

Signature

(gud-pdb-marker-filter STRING)

Source Code

;; Defined in /usr/src/emacs/lisp/progmodes/gud.el.gz
;; There's no guarantee that Emacs will hand the filter the entire
;; marker at once; it could be broken up across several strings.  We
;; might even receive a big chunk with several markers in it.  If we
;; receive a chunk of text which looks like it might contain the
;; beginning of a marker, we save it here between calls to the
;; filter.
(defun gud-pdb-marker-filter (string)
  (setq gud-marker-acc (concat gud-marker-acc string))
  (let ((output ""))

    ;; Process all the complete markers in this chunk.
    (while (string-match gud-pdb-marker-regexp gud-marker-acc)
      (setq

       ;; Extract the frame position from the marker.
       gud-last-frame
       (let ((file (match-string gud-pdb-marker-regexp-file-group
				 gud-marker-acc))
	     (line (string-to-number
		    (match-string gud-pdb-marker-regexp-line-group
				  gud-marker-acc))))
	 (if (string-equal file "<string>")
	     gud-last-frame
	   (cons file line)))

       ;; Output everything instead of the below
       output (concat output (substring gud-marker-acc 0 (match-end 0)))
;;	  ;; Append any text before the marker to the output we're going
;;	  ;; to return - we don't include the marker in this text.
;;	  output (concat output
;;		      (substring gud-marker-acc 0 (match-beginning 0)))

       ;; Set the accumulator to the remaining text.
       gud-marker-acc (substring gud-marker-acc (match-end 0))))

    ;; Does the remaining text look like it might end with the
    ;; beginning of another marker?  If it does, then keep it in
    ;; gud-marker-acc until we receive the rest of it.  Since we
    ;; know the full marker regexp above failed, it's pretty simple to
    ;; test for marker starts.
    (if (string-match gud-pdb-marker-regexp-start gud-marker-acc)
	(progn
	  ;; Everything before the potential marker start can be output.
	  (setq output (concat output (substring gud-marker-acc
						 0 (match-beginning 0))))

	  ;; Everything after, we save, to combine with later input.
	  (setq gud-marker-acc
		(substring gud-marker-acc (match-beginning 0))))

      (setq output (concat output gud-marker-acc)
	    gud-marker-acc ""))

    output))