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;;; semantic/doc.el --- Routines for documentation strings -*- lexical-binding: t; -*-
;; Copyright (C) 1999-2003, 2005, 2008-2021 Free Software Foundation,
;; Inc.
;; Author: Eric M. Ludlam <zappo@gnu.org>
;; Keywords: syntax
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; It is good practice to write documentation for your functions and
;; variables. These core routines deal with these documentation
;; comments or strings. They can exist either as a tag property
;; (:documentation) or as a comment just before the symbol, or after
;; the symbol on the same line.
(require 'semantic/tag)
;;; Code:
;;;###autoload
(define-overloadable-function semantic-documentation-for-tag (&optional tag nosnarf)
"Find documentation from TAG and return it as a clean string.
TAG might have DOCUMENTATION set in it already. If not, there may be
some documentation in a comment preceding TAG's definition which we
can look for. When appropriate, this can be overridden by a language specific
enhancement.
Optional argument NOSNARF means return only the lexical analyzer token for it.
If NOSNARF is `lex', then only return the lex token."
(if (not tag) (setq tag (semantic-current-tag)))
(save-excursion
(when (semantic-tag-with-position-p tag)
(set-buffer (semantic-tag-buffer tag)))
(:override
;; No override. Try something simple to find documentation nearby
(save-excursion
(semantic-go-to-tag tag)
(let ((doctmp (semantic-tag-docstring tag (current-buffer))))
(or
;; Is there doc in the tag???
doctmp
;; Check just before the definition.
(when (semantic-tag-with-position-p tag)
(semantic-documentation-comment-preceding-tag tag nosnarf))
;; Let's look for comments either after the definition, but before code:
;; Not sure yet. Fill in something clever later....
nil))))))
(defun semantic-documentation-comment-preceding-tag (&optional tag nosnarf)
"Find a comment preceding TAG.
If TAG is nil. use the tag under point.
Searches the space between TAG and the preceding tag for a comment,
and converts the comment into clean documentation.
Optional argument NOSNARF with a value of `lex' means to return
just the lexical token and not the string."
(if (not tag) (setq tag (semantic-current-tag)))
(save-excursion
;; Find this tag.
(semantic-go-to-tag tag)
(let* ((starttag (semantic-find-tag-by-overlay-prev
(semantic-tag-start tag)))
(start (if starttag
(semantic-tag-end starttag)
(point-min))))
(when (and comment-start-skip
(re-search-backward comment-start-skip start t))
;; We found a comment that doesn't belong to the body
;; of a function.
(semantic-doc-snarf-comment-for-tag nosnarf)))
))
(define-obsolete-function-alias
'semantic-documentation-comment-preceeding-tag
#'semantic-documentation-comment-preceding-tag
"25.1")
(defun semantic-doc-snarf-comment-for-tag (nosnarf)
"Snarf up the comment at POINT for `semantic-documentation-for-tag'.
Attempt to strip out comment syntactic sugar.
Argument NOSNARF means don't modify the found text.
If NOSNARF is `lex', then return the lex token."
(let* ((semantic-lex-analyzer #'semantic-comment-lexer))
(if (memq nosnarf '(lex flex)) ;; keep `flex' for compatibility
(car (semantic-lex (point) (1+ (point))))
(let ((ct (semantic-lex-token-text
(car (semantic-lex (point) (1+ (point)))))))
(if nosnarf
nil
;; ok, try to clean the text up.
;; Comment start thingy
(while (string-match (concat "^\\s-*\\(?:" comment-start-skip "\\)")
ct)
(setq ct (concat (substring ct 0 (match-beginning 0))
(substring ct (match-end 0)))))
;; Arbitrary punctuation at the beginning of each line.
(while (string-match "^\\s-*\\s.+\\s-*" ct)
(setq ct (concat (substring ct 0 (match-beginning 0))
(substring ct (match-end 0)))))
;; End of a block comment.
(if (and (boundp 'block-comment-end)
block-comment-end
(string-match block-comment-end ct))
(setq ct (concat (substring ct 0 (match-beginning 0))
(substring ct (match-end 0)))))
;; In case it's a real string, STRIPIT.
(while (string-match "\\s-*\\s\"+\\s-*" ct)
(setq ct (concat (substring ct 0 (match-beginning 0))
(substring ct (match-end 0)))))
;; Remove comment delimiter at the end of the string.
(when (and comment-end (not (string= comment-end ""))
(string-match (concat (regexp-quote comment-end) "$") ct))
(setq ct (substring ct 0 (match-beginning 0)))))
;; Now return the text.
ct))))
(provide 'semantic/doc)
;; Local variables:
;; generated-autoload-file: "loaddefs.el"
;; generated-autoload-load-name: "semantic/doc"
;; End:
;;; semantic/doc.el ends here
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