diff options
Diffstat (limited to 'lisp/emacs-lisp/debug.el')
| -rw-r--r-- | lisp/emacs-lisp/debug.el | 80 |
1 files changed, 74 insertions, 6 deletions
diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el index aa5b25b05f8..87d1d1eae64 100644 --- a/lisp/emacs-lisp/debug.el +++ b/lisp/emacs-lisp/debug.el @@ -494,9 +494,13 @@ removes itself from that hook." (forward-line 1) (while (progn (forward-char 2) - (if (= (following-char) ?\() - (forward-sexp 1) - (forward-sexp 2)) + (cond ((debugger--locals-visible-p) + (goto-char (next-single-char-property-change + (point) 'locals-visible))) + ((= (following-char) ?\() + (forward-sexp 1)) + (t + (forward-sexp 2))) (forward-line 1) (<= (point) opoint)) (if (looking-at " *;;;") @@ -541,6 +545,14 @@ Applies to the frame whose line point is on in the backtrace." (progn ,@body) (setq debugger-outer-match-data (match-data))))) +(defun debugger--backtrace-base () + "Return the function name that marks the top of the backtrace. +See `backtrace-frame'." + (cond ((eq 'debug--implement-debug-on-entry + (cadr (backtrace-frame 1 'debug))) + 'debug--implement-debug-on-entry) + (t 'debug))) + (defun debugger-eval-expression (exp &optional nframe) "Eval an expression, in an environment like that outside the debugger. The environment used is the one when entering the activation frame at point." @@ -549,15 +561,70 @@ The environment used is the one when entering the activation frame at point." (let ((nframe (or nframe (condition-case nil (1+ (debugger-frame-number 'skip-base)) (error 0)))) ;; If on first line. - (base (if (eq 'debug--implement-debug-on-entry - (cadr (backtrace-frame 1 'debug))) - 'debug--implement-debug-on-entry 'debug))) + (base (debugger--backtrace-base))) (debugger-env-macro (let ((val (backtrace-eval exp nframe base))) (prog1 (prin1 val t) (let ((str (eval-expression-print-format val))) (if str (princ str t)))))))) + +(defun debugger--locals-visible-p () + "Are the local variables of the current stack frame visible?" + (save-excursion + (move-to-column 2) + (get-text-property (point) 'locals-visible))) + +(defun debugger--insert-locals (locals) + "Insert the local variables LOCALS at point." + (cond ((null locals) + (insert "\n [no locals]")) + (t + (let ((print-escape-newlines t)) + (dolist (s+v locals) + (let ((symbol (car s+v)) + (value (cdr s+v))) + (insert "\n ") + (prin1 symbol (current-buffer)) + (insert " = ") + (prin1 value (current-buffer)))))))) + +(defun debugger--show-locals () + "For the frame at point, insert locals and add text properties." + (let* ((nframe (1+ (debugger-frame-number 'skip-base))) + (base (debugger--backtrace-base)) + (locals (backtrace--locals nframe base)) + (inhibit-read-only t)) + (save-excursion + (let ((start (progn + (move-to-column 2) + (point)))) + (end-of-line) + (debugger--insert-locals locals) + (add-text-properties start (point) '(locals-visible t)))))) + +(defun debugger--hide-locals () + "Delete local variables and remove the text property." + (let* ((col (current-column)) + (end (progn + (move-to-column 2) + (next-single-char-property-change (point) 'locals-visible))) + (start (previous-single-char-property-change end 'locals-visible)) + (inhibit-read-only t)) + (remove-text-properties start end '(locals-visible)) + (goto-char start) + (end-of-line) + (delete-region (point) end) + (move-to-column col))) + +(defun debugger-toggle-locals () + "Show or hide local variables of the current stack frame." + (interactive) + (cond ((debugger--locals-visible-p) + (debugger--hide-locals)) + (t + (debugger--show-locals)))) + (defvar debugger-mode-map (let ((map (make-keymap)) @@ -575,6 +642,7 @@ The environment used is the one when entering the activation frame at point." (define-key map "h" 'describe-mode) (define-key map "q" 'top-level) (define-key map "e" 'debugger-eval-expression) + (define-key map "v" 'debugger-toggle-locals) ;"v" is for "v"ariables. (define-key map " " 'next-line) (define-key map "R" 'debugger-record-expression) (define-key map "\C-m" 'debug-help-follow) |