diff options
Diffstat (limited to 'lisp/emacs-lisp/macroexp.el')
| -rw-r--r-- | lisp/emacs-lisp/macroexp.el | 106 |
1 files changed, 88 insertions, 18 deletions
diff --git a/lisp/emacs-lisp/macroexp.el b/lisp/emacs-lisp/macroexp.el index 053db927b67..0b19544652a 100644 --- a/lisp/emacs-lisp/macroexp.el +++ b/lisp/emacs-lisp/macroexp.el @@ -238,22 +238,85 @@ It should normally be a symbol with position and it defaults to FORM." form)))))))) (t form))) +(defun sub-macroexp--posify-form (form call-pos depth) + "Try to apply the transformation of `macroexp--posify-form' to FORM. +FORM and CALL-POS are as in that function. DEPTH is a small integer, +decremented at each recursive call, to prevent infinite recursion. +Return the changed form, or nil if no change happened." + (let (new-form) + (cond + ((zerop depth) nil) + ((and (consp form) + (symbolp (car form)) + (car form)) + (setcar form (position-symbol (car form) call-pos)) + form) + ((consp form) + (or (when (setq new-form (sub-macroexp--posify-form + (car form) call-pos (1- depth))) + (setcar form new-form) + form) + (when (setq new-form (sub-macroexp--posify-form + (cdr form) call-pos (1- depth))) + (setcdr form new-form) + form))) + ((symbolp form) + (if form ; Don't position nil! + (position-symbol form call-pos))) + ((and (or (vectorp form) (recordp form))) + (let ((len (length form)) + (i 0) + ) + (while (and (< i len) + (not (setq new-form (sub-macroexp--posify-form + (aref form i) call-pos (1- depth))))) + (setq i (1+ i))) + (when (< i len) + (aset form i new-form) + form)))))) + +(defun macroexp--posify-form (form call-pos) + "Try to apply the position CALL-POS to the form FORM. +CALL-POS is a buffer position, a number. FORM may be any lisp form, +and is typically the output form returned by macro expansion. +Apply CALL-POS to FORM as a symbol with position, such that +`byte-compile--first-symbol-with-pos' can later return it. Return +the possibly modified FORM." + (let ((new-form (sub-macroexp--posify-form form call-pos 10))) + (or new-form form))) + +(defmacro macroexp-preserve-posification (pos-form &rest body) + "Evaluate BODY..., posifying the result with POS-FORM's position, if any." + `(let ((call-pos (cond + ((consp ,pos-form) + (and (symbol-with-pos-p (car ,pos-form)) + (symbol-with-pos-pos (car ,pos-form)))) + ((symbol-with-pos-p ,pos-form) + (symbol-with-pos-pos ,pos-form)))) + (new-value (progn ,@body))) + (if call-pos + (macroexp--posify-form new-value call-pos) + new-value))) + (defun macroexp-macroexpand (form env) "Like `macroexpand' but checking obsolescence." (let* ((macroexpand-all-environment env) new-form) - (while (not (eq form (setq new-form (macroexpand-1 form env)))) - (let ((fun (car-safe form))) - (setq form - (if (and fun (symbolp fun) - (get fun 'byte-obsolete-info)) - (macroexp-warn-and-return - (macroexp--obsolete-warning - fun (get fun 'byte-obsolete-info) - (if (symbolp (symbol-function fun)) "alias" "macro")) - new-form (list 'obsolete fun) nil fun) - new-form)))) - form)) + (macroexp-preserve-posification + form + (while (not (eq form (setq new-form (macroexpand-1 form env)))) + (setq macroexpanded t) + (let ((fun (car-safe form))) + (setq form + (if (and fun (symbolp fun) + (get fun 'byte-obsolete-info)) + (macroexp-warn-and-return + (macroexp--obsolete-warning + fun (get fun 'byte-obsolete-info) + (if (symbolp (symbol-function fun)) "alias" "macro")) + new-form (list 'obsolete fun) nil fun) + new-form)))) + new-form))) (defun macroexp--unfold-lambda (form &optional name) (or name (setq name "anonymous lambda")) @@ -517,14 +580,21 @@ Assumes the caller has bound `macroexpand-all-environment'." (_ form)))))) ;;;###autoload -(defun macroexpand-all (form &optional environment) +(defun macroexpand-all (form &optional environment keep-pos) "Return result of expanding macros at all levels in FORM. -If no macros are expanded, FORM is returned unchanged. -The second optional arg ENVIRONMENT specifies an environment of macro -definitions to shadow the loaded ones for use in file byte-compilation." - (let ((macroexpand-all-environment environment) +If no macros are expanded, FORM is returned unchanged. The second +optional arg ENVIRONMENT specifies an environment of macro definitions +to shadow the loaded ones for use in file byte-compilation. KEEP-POS, +if non-nil, specifies that any symbol-with-position for FORM should be +preserved, later to be usable by `byte-compile--warning-source-offset'." + (let* + ((macroexpand-all-environment environment) (macroexp--dynvars macroexp--dynvars)) - (macroexp--expand-all form))) + (if keep-pos + (macroexp-preserve-posification + form + (macroexp--expand-all form)) + (macroexp--expand-all form)))) ;; This function is like `macroexpand-all' but for use with top-level ;; forms. It does not dynbind `macroexp--dynvars' because we want |