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;;; semantic/tag-file.el --- Routines that find files based on tags. -*- lexical-binding: t; -*-
;; Copyright (C) 1999-2005, 2007-2021 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:
;;
;; A tag, by itself, can have representations in several files.
;; These routines will find those files.
(require 'semantic/tag)
(defvar ede-minor-mode)
(declare-function semanticdb-table-child-p "semantic/db" t t)
(declare-function semanticdb-get-buffer "semantic/db")
(declare-function semantic-dependency-find-file-on-path "semantic/dep")
(declare-function ede-toplevel "ede/base")
;;; Code:
;;; Location a TAG came from.
;;
;;;###autoload
(define-overloadable-function semantic-go-to-tag (tag &optional parent)
"Go to the location of TAG.
TAG may be a stripped element, in which case PARENT specifies a
parent tag that has position information.
PARENT can also be a `semanticdb-table' object."
(:override
(save-match-data
(cond ((semantic-tag-in-buffer-p tag)
;; We have a linked tag, go to that buffer.
(set-buffer (semantic-tag-buffer tag)))
((semantic-tag-file-name tag)
;; If it didn't have a buffer, but does have a file
;; name, then we need to get to that file so the tag
;; location is made accurate.
(set-buffer (find-file-noselect (semantic-tag-file-name tag))))
((and parent (semantic-tag-p parent) (semantic-tag-in-buffer-p parent))
;; The tag had nothing useful, but we have a parent with
;; a buffer, then go there.
(set-buffer (semantic-tag-buffer parent)))
((and parent (semantic-tag-p parent) (semantic-tag-file-name parent))
;; Tag had nothing, and the parent only has a file-name, then
;; find that file, and switch to that buffer.
(set-buffer (find-file-noselect (semantic-tag-file-name parent))))
((and parent (featurep 'semantic/db)
(semanticdb-table-child-p parent))
(set-buffer (semanticdb-get-buffer parent)))
(t
;; Well, just assume things are in the current buffer.
nil
)))
;; We should be in the correct buffer now, try and figure out
;; where the tag is.
(cond ((semantic-tag-with-position-p tag)
;; If it's a number, go there
(goto-char (semantic-tag-start tag)))
((semantic-tag-with-position-p parent)
;; Otherwise, it's a trimmed vector, such as a parameter,
;; or a structure part. If there is a parent, we can use it
;; as a bounds for searching.
(goto-char (semantic-tag-start parent))
;; Here we make an assumption that the text returned by
;; the parser and concocted by us actually exists
;; in the buffer.
(re-search-forward (semantic-tag-name tag)
(semantic-tag-end parent)
t))
((semantic-tag-get-attribute tag :line)
;; The tag has a line number in it. Go there.
(goto-char (point-min))
(forward-line (1- (semantic-tag-get-attribute tag :line))))
((and (semantic-tag-p parent) (semantic-tag-get-attribute parent :line))
;; The tag has a line number in it. Go there.
(goto-char (point-min))
(forward-line (1- (semantic-tag-get-attribute parent :line)))
(re-search-forward (semantic-tag-name tag) nil t))
(t
;; Take a guess that the tag has a unique name, and just
;; search for it from the beginning of the buffer.
(goto-char (point-min))
(re-search-forward (semantic-tag-name tag) nil t)))
)
)
;;; Dependencies
;;
;; A tag which is of type 'include specifies a dependency.
;; Dependencies usually represent a file of some sort.
;; Find the file described by a dependency.
;;;###autoload
(define-overloadable-function semantic-dependency-tag-file (&optional tag)
"Find the filename represented from TAG.
Depends on `semantic-dependency-include-path' for searching. Always searches
`.' first, then searches additional paths."
(or tag (setq tag (car (semantic-find-tag-by-overlay nil))))
(unless (semantic-tag-of-class-p tag 'include)
(signal 'wrong-type-argument (list tag 'include)))
(save-excursion
(let ((result nil)
(default-directory default-directory)
(edefind nil)
(tag-fname nil))
(cond ((semantic-tag-in-buffer-p tag)
;; If the tag has an overlay and buffer associated with it,
;; switch to that buffer so that we get the right override methods.
(set-buffer (semantic-tag-buffer tag)))
((semantic-tag-file-name tag)
;; If it didn't have a buffer, but does have a file
;; name, then we need to get to that file so the tag
;; location is made accurate.
;;(set-buffer (find-file-noselect (semantic-tag-file-name tag)))
;;
;; 2/3/08
;; The above causes unnecessary buffer loads all over the place. Ick!
;; All we really need is for 'default-directory' to be set correctly.
(setq default-directory (file-name-directory (semantic-tag-file-name tag)))
))
;; Setup the filename represented by this include
(setq tag-fname (semantic-tag-include-filename tag))
;; First, see if this file exists in the current EDE project
(if (and (fboundp 'ede-expand-filename) ede-minor-mode
(setq edefind
(condition-case nil
(let ((proj (ede-toplevel)))
(when proj
(ede-expand-filename proj tag-fname)))
(error nil))))
(setq result edefind))
(if (not result)
(setq result
;; I don't have a plan for refreshing tags with a dependency
;; stuck on them somehow. I'm thinking that putting a cache
;; onto the dependency finding with a hash table might be best.
;;(if (semantic--tag-get-property tag 'dependency-file)
;; (semantic--tag-get-property tag 'dependency-file)
(:override
(save-excursion
(require 'semantic/dep)
(semantic-dependency-find-file-on-path
tag-fname (semantic-tag-include-system-p tag))))
;; )
))
(if (stringp result)
(progn
(semantic--tag-put-property tag 'dependency-file result)
result)
;; @todo: Do something to make this get flushed w/
;; when the path is changed.
;; @undo: Just eliminate
;; (semantic--tag-put-property tag 'dependency-file 'none)
nil)
)))
;;; PROTOTYPE FILE
;;
;; In C, a function in the .c file often has a representation in a
;; corresponding .h file. This routine attempts to find the
;; prototype file a given source file would be associated with.
;; This can be used by prototype manager programs.
(define-overloadable-function semantic-prototype-file (buffer)
"Return a file in which prototypes belonging to BUFFER should be placed.
Default behavior (if not overridden) looks for a token specifying the
prototype file, or the existence of an EDE variable indicating which
file prototypes belong in."
(:override
;; Perform some default behaviors
(if (and (fboundp 'ede-header-file) ede-minor-mode)
(with-current-buffer buffer
(ede-header-file))
;; No EDE options for a quick answer. Search.
(with-current-buffer buffer
(if (re-search-forward "::Header:: \\([a-zA-Z0-9.]+\\)" nil t)
(match-string 1))))))
(provide 'semantic/tag-file)
;; Local variables:
;; generated-autoload-file: "loaddefs.el"
;; generated-autoload-load-name: "semantic/tag-file"
;; End:
;;; semantic/tag-file.el ends here
|
