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1 | ;;; semantic/symref/filter.el --- Filter symbol reference hits for accuracy. |
2 | ||
3 | ;;; Copyright (C) 2009 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Eric M. Ludlam <eric@siege-engine.com> | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software: you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation, either version 3 of the License, or | |
12 | ;; (at your option) any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. | |
21 | ||
22 | ;;; Commentary: | |
23 | ;; | |
24 | ;; Filter symbol reference hits for accuracy. | |
25 | ;; | |
26 | ;; Most symbol referencing tools, such as find/grep only find matching | |
27 | ;; strings, but cannot determine the difference between an actual use, | |
28 | ;; and something else with a similar name, or even a string in a comment. | |
29 | ;; | |
30 | ;; This file provides utilities for filtering down to accurate matches | |
31 | ;; starting at a basic filter level that doesn't use symref, up to filters | |
32 | ;; across symref results. | |
33 | ||
34 | ;;; Code: | |
35 | ||
36 | (require 'semantic) | |
37 | ||
38 | ;;; FILTERS | |
39 | ;; | |
40 | (defun semantic-symref-filter-hit (target &optional position) | |
41 | "Determine if the tag TARGET is used at POSITION in the current buffer. | |
42 | Return non-nil for a match." | |
43 | (semantic-analyze-current-symbol | |
44 | (lambda (start end prefix) | |
45 | (let ((tag (car (nreverse prefix)))) | |
46 | (and (semantic-tag-p tag) | |
47 | (semantic-equivalent-tag-p target tag)))) | |
48 | position)) | |
49 | ||
50 | ;;; IN-BUFFER FILTERING | |
51 | ||
52 | ;; The following does filtering in-buffer only, and not against | |
53 | ;; a symref results object. | |
54 | ||
55 | (defun semantic-symref-hits-in-region (target hookfcn start end) | |
56 | "Find all occurances of the symbol TARGET that match TARGET the tag. | |
57 | For each match, call HOOKFCN. | |
58 | HOOKFCN takes three arguments that match | |
59 | `semantic-analyze-current-symbol's use of HOOKfCN. | |
60 | ( START END PREFIX ) | |
61 | ||
62 | Search occurs in the current buffer between START and END." | |
63 | (save-excursion | |
64 | (goto-char start) | |
65 | (let* ((str (semantic-tag-name target)) | |
66 | (case-fold-search semantic-case-fold) | |
67 | (regexp (concat "\\<" (regexp-quote str) "\\>"))) | |
68 | (while (re-search-forward regexp end t) | |
69 | (when (semantic-idle-summary-useful-context-p) | |
70 | (semantic-analyze-current-symbol | |
71 | (lambda (start end prefix) | |
72 | (let ((tag (car (nreverse prefix)))) | |
73 | ;; check for semantic match on the text match. | |
74 | (when (and (semantic-tag-p tag) | |
75 | (semantic-equivalent-tag-p target tag)) | |
76 | (save-excursion | |
77 | (funcall hookfcn start end prefix))))) | |
78 | (point))))))) | |
79 | ||
80 | ;;;###autoload | |
81 | (defun semantic-symref-test-count-hits-in-tag () | |
82 | "Lookup in the current tag the symbol under point. | |
83 | the count all the other references to the same symbol within the | |
84 | tag that contains point, and return that." | |
85 | (interactive) | |
86 | (let* ((ctxt (semantic-analyze-current-context)) | |
87 | (target (car (reverse (oref ctxt prefix)))) | |
88 | (tag (semantic-current-tag)) | |
89 | (start (current-time)) | |
90 | (Lcount 0)) | |
91 | (when (semantic-tag-p target) | |
92 | (semantic-symref-hits-in-region | |
93 | target (lambda (start end prefix) (setq Lcount (1+ Lcount))) | |
94 | (semantic-tag-start tag) | |
95 | (semantic-tag-end tag)) | |
96 | (when (interactive-p) | |
97 | (message "Found %d occurances of %s in %.2f seconds" | |
98 | Lcount (semantic-tag-name target) | |
99 | (semantic-elapsed-time start (current-time)))) | |
100 | Lcount))) | |
101 | ||
102 | (defun semantic-symref-rename-local-variable () | |
103 | "Fancy way to rename the local variable under point. | |
104 | Depends on the SRecode Field editing API." | |
105 | (interactive) | |
106 | ;; Do the replacement as needed. | |
107 | (let* ((ctxt (semantic-analyze-current-context)) | |
108 | (target (car (reverse (oref ctxt prefix)))) | |
109 | (tag (semantic-current-tag)) | |
110 | ) | |
111 | ||
112 | (when (or (not target) | |
113 | (not (semantic-tag-with-position-p target))) | |
114 | (error "Cannot identify symbol under point")) | |
115 | ||
116 | (when (not (semantic-tag-of-class-p target 'variable)) | |
117 | (error "Can only rename variables")) | |
118 | ||
119 | (when (or (< (semantic-tag-start target) (semantic-tag-start tag)) | |
120 | (> (semantic-tag-end target) (semantic-tag-end tag))) | |
121 | (error "Can only rename variables declared in %s" | |
122 | (semantic-tag-name tag))) | |
123 | ||
124 | ;; I think we're good for this example. Give it a go through | |
125 | ;; our fancy interface from SRecode. | |
126 | (require 'srecode-fields) | |
127 | ||
128 | ;; Make sure there is nothing active. | |
129 | (let ((ar (srecode-active-template-region))) | |
130 | (when ar (srecode-delete ar))) | |
131 | ||
132 | (let ((srecode-field-archive nil) | |
133 | (region nil) | |
134 | ) | |
135 | (semantic-symref-hits-in-region | |
136 | target (lambda (start end prefix) | |
137 | ;; For every valid hit, create one field. | |
138 | (srecode-field "LOCAL" :name "LOCAL" :start start :end end)) | |
139 | (semantic-tag-start tag) (semantic-tag-end tag)) | |
140 | ||
141 | ;; Now that the fields are setup, create the region. | |
142 | (setq region (srecode-template-inserted-region | |
143 | "REGION" :start (semantic-tag-start tag) | |
144 | :end (semantic-tag-end tag))) | |
145 | ||
146 | ;; Activate the region. | |
147 | (srecode-overlaid-activate region) | |
148 | ||
149 | ) | |
150 | )) | |
151 | ||
152 | (provide 'semantic/symref/filter) | |
153 | ||
154 | ;; Local variables: | |
155 | ;; generated-autoload-file: "../loaddefs.el" | |
156 | ;; generated-autoload-feature: semantic/loaddefs | |
157 | ;; generated-autoload-load-name: "semantic/symref/filter" | |
158 | ;; End: | |
159 | ||
160 | ;;; semantic/symref/filter.el ends here |