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|
;;; semantic/bovine/make.el --- Makefile parsing rules. -*- lexical-binding: t; -*-
;; Copyright (C) 2000-2004, 2008-2021 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <zappo@gnu.org>
;; 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:
;;
;; Use the Semantic Bovinator to parse Makefiles.
;; Concocted as an experiment for nonstandard languages.
(require 'make-mode)
(require 'semantic)
(require 'semantic/bovine)
(require 'semantic/bovine/make-by)
(require 'semantic/analyze)
(require 'semantic/dep)
(declare-function semantic-analyze-possible-completions-default
"semantic/analyze/complete")
;;; Code:
(define-lex-analyzer semantic-lex-make-backslash-no-newline
"Detect and create a beginning of line token (BOL)."
(and (looking-at "\\(\\\\\n\\s-*\\)")
;; We have a \ at eol. Push it as whitespace, but pretend
;; it never happened so we can skip the BOL tokenizer.
(semantic-lex-push-token (semantic-lex-token 'whitespace
(match-beginning 1)
(match-end 1)))
(goto-char (match-end 1))
nil) ;; CONTINUE
;; We want to skip BOL, so move to the next condition.
nil)
(define-lex-regex-analyzer semantic-lex-make-command
"Regexp for a command in a Makefile.
It consists of a line starting with TAB, and ending at the newline."
"^\\(\t\\)"
(let ((start (match-end 0)))
(while (progn (end-of-line)
(save-excursion (forward-char -1) (looking-at "\\\\")))
(forward-char 1))
(semantic-lex-push-token
(semantic-lex-token 'shell-command start (point)))))
(define-lex-regex-analyzer semantic-lex-make-ignore-automake-conditional
"An automake conditional seems to really bog down the parser.
Ignore them."
"^@\\(\\w\\|\\s_\\)+@"
(setq semantic-lex-end-point (match-end 0)))
(define-lex semantic-make-lexer
"Lexical analyzer for Makefiles."
semantic-lex-beginning-of-line
semantic-lex-make-ignore-automake-conditional
semantic-lex-make-command
semantic-lex-make-backslash-no-newline
semantic-lex-whitespace
semantic-lex-newline
semantic-lex-symbol-or-keyword
semantic-lex-charquote
semantic-lex-paren-or-list
semantic-lex-close-paren
semantic-lex-string
semantic-lex-ignore-comments
semantic-lex-punctuation
semantic-lex-default-action)
(defun semantic-make-expand-tag (tag)
"Expand TAG into a list of equivalent tags, or nil."
(let ((name (semantic-tag-name tag))
xpand)
;(message "Expanding %S" name)
;(goto-char (semantic-tag-start tag))
;(sit-for 0)
(if (and (consp name)
(memq (semantic-tag-class tag) '(function include))
(> (length name) 1))
(while name
(setq xpand (cons (semantic-tag-clone tag (car name)) xpand)
name (cdr name)))
;; Else, only a single name.
(when (consp name)
(setcar tag (car name)))
(setq xpand (list tag)))
xpand))
(define-mode-local-override semantic-get-local-variables
makefile-mode (&optional _point)
"Override `semantic-get-local-variables' so it does not throw an error.
We never have local variables in Makefiles."
nil)
(define-mode-local-override semantic-ctxt-current-class-list
makefile-mode (&optional _point)
"List of classes that are valid to place at point."
(let ((tag (semantic-current-tag)))
(when tag
(cond ((condition-case nil
(save-excursion
(condition-case nil (forward-sexp -1)
(error nil))
(forward-char -2)
(looking-at "\\$\\s("))
(error nil))
;; We are in a variable reference
'(variable))
((semantic-tag-of-class-p tag 'function)
;; Note: variables are handled above.
'(function filename))
((semantic-tag-of-class-p tag 'variable)
'(function filename))
))))
(define-mode-local-override semantic-format-tag-abbreviate
makefile-mode (tag &optional parent color)
"Return an abbreviated string describing tag for Makefiles."
(let ((class (semantic-tag-class tag))
(name (semantic-format-tag-name tag parent color))
)
(cond ((eq class 'function)
(concat name ":"))
((eq class 'filename)
(concat "./" name))
(t
(semantic-format-tag-abbreviate-default tag parent color)))))
(defvar-mode-local makefile-mode semantic-function-argument-separator
" "
"Separator used between dependencies to rules.")
(define-mode-local-override semantic-format-tag-prototype
makefile-mode (tag &optional parent color)
"Return a prototype string describing tag for Makefiles."
(let* ((class (semantic-tag-class tag))
(name (semantic-format-tag-name tag parent color))
)
(cond ((eq class 'function)
(concat name ": "
(semantic--format-tag-arguments
(semantic-tag-function-arguments tag)
#'semantic-format-tag-prototype
color)))
((eq class 'filename)
(concat "./" name))
(t
(semantic-format-tag-prototype-default tag parent color)))))
(define-mode-local-override semantic-format-tag-concise-prototype
makefile-mode (tag &optional parent color)
"Return a concise prototype string describing tag for Makefiles.
This is the same as a regular prototype."
(semantic-format-tag-prototype tag parent color))
(define-mode-local-override semantic-format-tag-uml-prototype
makefile-mode (tag &optional parent color)
"Return a UML prototype string describing tag for Makefiles.
This is the same as a regular prototype."
(semantic-format-tag-prototype tag parent color))
(define-mode-local-override semantic-analyze-possible-completions
makefile-mode (context &rest _flags)
"Return a list of possible completions in a Makefile.
Uses default implementation, and also gets a list of filenames."
(require 'semantic/analyze/complete)
(with-current-buffer (oref context buffer)
(let* ((normal (semantic-analyze-possible-completions-default context))
(classes (oref context prefixclass))
(filetags nil))
(when (memq 'filename classes)
(let* ((prefix (car (oref context prefix)))
(completetext (cond ((semantic-tag-p prefix)
(semantic-tag-name prefix))
((stringp prefix)
prefix)
((stringp (car prefix))
(car prefix))))
(files (directory-files default-directory nil
(concat "^" completetext))))
(setq filetags (mapcar (lambda (f) (semantic-tag f 'filename))
files))))
;; Return the normal completions found, plus any filenames
;; that match.
(append normal filetags)
)))
(defcustom-mode-local-semantic-dependency-system-include-path
makefile-mode semantic-makefile-dependency-system-include-path
nil
"The system include path used by Makefiles language.")
;;;###autoload
(defun semantic-default-make-setup ()
"Set up a Makefile buffer for parsing with semantic."
(semantic-make-by--install-parser)
(setq semantic-symbol->name-assoc-list '((variable . "Variables")
(function . "Rules")
(include . "Dependencies")
;; File is a meta-type created
;; to represent completions
;; but not actually parsed.
(file . "File"))
semantic-case-fold t
semantic-tag-expand-function #'semantic-make-expand-tag
semantic-lex-syntax-modifications '((?. "_")
(?= ".")
(?/ "_")
(?$ ".")
(?+ ".")
(?\\ ".")
)
imenu-create-index-function #'semantic-create-imenu-index
)
(setq semantic-lex-analyzer #'semantic-make-lexer)
)
(provide 'semantic/bovine/make)
;; Local variables:
;; generated-autoload-file: "../loaddefs.el"
;; generated-autoload-load-name: "semantic/bovine/make"
;; End:
;;; semantic/bovine/make.el ends here
|
