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978c25c6 | 1 | ;;; semantic/doc.el --- Routines for documentation strings |
a6de3d1a | 2 | |
95df8112 | 3 | ;; Copyright (C) 1999-2003, 2005, 2008-2011 Free Software Foundation, Inc. |
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4 | |
5 | ;; Author: Eric M. Ludlam <zappo@gnu.org> | |
6 | ;; Keywords: syntax | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software: you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation, either version 3 of the License, or | |
13 | ;; (at your option) any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. | |
22 | ||
23 | ;;; Commentary: | |
24 | ;; | |
9bf6c65c | 25 | ;; It is good practice to write documentation for your functions and |
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26 | ;; variables. These core routines deal with these documentation |
27 | ;; comments or strings. They can exist either as a tag property | |
28 | ;; (:documentation) or as a comment just before the symbol, or after | |
29 | ;; the symbol on the same line. | |
30 | ||
31 | (require 'semantic/tag) | |
32 | ||
33 | ;;; Code: | |
34 | ||
3d9d8486 | 35 | ;;;###autoload |
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36 | (define-overloadable-function semantic-documentation-for-tag (&optional tag nosnarf) |
37 | "Find documentation from TAG and return it as a clean string. | |
38 | TAG might have DOCUMENTATION set in it already. If not, there may be | |
39 | some documentation in a comment preceding TAG's definition which we | |
40 | can look for. When appropriate, this can be overridden by a language specific | |
41 | enhancement. | |
42 | Optional argument NOSNARF means to only return the lexical analyzer token for it. | |
43 | If nosnarf if 'lex, then only return the lex token." | |
44 | (if (not tag) (setq tag (semantic-current-tag))) | |
45 | (save-excursion | |
46 | (when (semantic-tag-with-position-p tag) | |
47 | (set-buffer (semantic-tag-buffer tag))) | |
48 | (:override | |
49 | ;; No override. Try something simple to find documentation nearby | |
50 | (save-excursion | |
51 | (semantic-go-to-tag tag) | |
52 | (let ((doctmp (semantic-tag-docstring tag (current-buffer)))) | |
53 | (or | |
54 | ;; Is there doc in the tag??? | |
55 | doctmp | |
56 | ;; Check just before the definition. | |
57 | (when (semantic-tag-with-position-p tag) | |
58 | (semantic-documentation-comment-preceeding-tag tag nosnarf)) | |
59 | ;; Lets look for comments either after the definition, but before code: | |
60 | ;; Not sure yet. Fill in something clever later.... | |
61 | nil)))))) | |
62 | ||
9bf6c65c | 63 | ;; FIXME this is not how you spell "preceding". |
a6de3d1a | 64 | (defun semantic-documentation-comment-preceeding-tag (&optional tag nosnarf) |
9bf6c65c | 65 | "Find a comment preceding TAG. |
a6de3d1a | 66 | If TAG is nil. use the tag under point. |
9bf6c65c | 67 | Searches the space between TAG and the preceding tag for a comment, |
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68 | and converts the comment into clean documentation. |
69 | Optional argument NOSNARF with a value of 'lex means to return | |
70 | just the lexical token and not the string." | |
71 | (if (not tag) (setq tag (semantic-current-tag))) | |
72 | (save-excursion | |
73 | ;; Find this tag. | |
74 | (semantic-go-to-tag tag) | |
75 | (let* ((starttag (semantic-find-tag-by-overlay-prev | |
76 | (semantic-tag-start tag))) | |
77 | (start (if starttag | |
78 | (semantic-tag-end starttag) | |
79 | (point-min)))) | |
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80 | (when (and comment-start-skip |
81 | (re-search-backward comment-start-skip start t)) | |
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82 | ;; We found a comment that doesn't belong to the body |
83 | ;; of a function. | |
84 | (semantic-doc-snarf-comment-for-tag nosnarf))) | |
85 | )) | |
86 | ||
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87 | (defun semantic-doc-snarf-comment-for-tag (nosnarf) |
88 | "Snarf up the comment at POINT for `semantic-documentation-for-tag'. | |
89 | Attempt to strip out comment syntactic sugar. | |
90 | Argument NOSNARF means don't modify the found text. | |
91 | If NOSNARF is 'lex, then return the lex token." | |
92 | (let* ((semantic-ignore-comments nil) | |
93 | (semantic-lex-analyzer #'semantic-comment-lexer)) | |
94 | (if (memq nosnarf '(lex flex)) ;; keep `flex' for compatibility | |
95 | (car (semantic-lex (point) (1+ (point)))) | |
96 | (let ((ct (semantic-lex-token-text | |
97 | (car (semantic-lex (point) (1+ (point))))))) | |
98 | (if nosnarf | |
99 | nil | |
100 | ;; ok, try to clean the text up. | |
101 | ;; Comment start thingy | |
102 | (while (string-match (concat "^\\s-*" comment-start-skip) ct) | |
103 | (setq ct (concat (substring ct 0 (match-beginning 0)) | |
104 | (substring ct (match-end 0))))) | |
105 | ;; Arbitrary punctuation at the beginning of each line. | |
106 | (while (string-match "^\\s-*\\s.+\\s-*" ct) | |
107 | (setq ct (concat (substring ct 0 (match-beginning 0)) | |
108 | (substring ct (match-end 0))))) | |
109 | ;; End of a block comment. | |
110 | (if (and (boundp 'block-comment-end) | |
111 | block-comment-end | |
112 | (string-match block-comment-end ct)) | |
113 | (setq ct (concat (substring ct 0 (match-beginning 0)) | |
114 | (substring ct (match-end 0))))) | |
115 | ;; In case it's a real string, STRIPIT. | |
116 | (while (string-match "\\s-*\\s\"+\\s-*" ct) | |
117 | (setq ct (concat (substring ct 0 (match-beginning 0)) | |
118 | (substring ct (match-end 0)))))) | |
119 | ;; Now return the text. | |
120 | ct)))) | |
121 | ||
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122 | (provide 'semantic/doc) |
123 | ||
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124 | ;; Local variables: |
125 | ;; generated-autoload-file: "loaddefs.el" | |
996bc9bf | 126 | ;; generated-autoload-load-name: "semantic/doc" |
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127 | ;; End: |
128 | ||
978c25c6 | 129 | ;;; semantic/doc.el ends here |