;;; make.by -- BY notation for Makefiles.

;; Copyright (C) 1999-2021 Free Software Foundation, Inc.
;;
;; Author: Eric M. Ludlam <zappo@gnu.org>
;;         David Ponce <david@dponce.com>
;;         Klaus Berndl <klaus.berndl@sdm.de>
;;
;; 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/>.

%package semantic-make-by
%provide semantic/bovine/make-by

%languagemode  makefile-mode
%start         Makefile

;; This was always a test case.
%quotemode     backquote

%token IF      "if"
%token IFDEF   "ifdef"
%token IFNDEF  "ifndef"
%token IFEQ    "ifeq"
%token IFNEQ   "ifneq"
%token ELSE    "else"
%token ENDIF   "endif"
%token INCLUDE "include"

%put { IF ELSE ENDIF } summary "Conditional: if (expression) ... else ... endif"
%put IFDEF   summary "Conditional: ifdef (expression) ... else ... endif"
%put IFNDEF  summary "Conditional: ifndef (expression) ... else ... endif"
%put IFEQ    summary "Conditional: ifeq (expression) ... else ... endif"
%put IFNEQ   summary "Conditional: ifneq (expression) ... else ... endif"
%put INCLUDE summary "Macro: include filename1 filename2 ..."

%token <punctuation> COLON     "\\`[:]\\'"
%token <punctuation> PLUS      "\\`[+]\\'"
%token <punctuation> EQUAL     "\\`[=]\\'"
%token <punctuation> DOLLAR    "\\`[$]\\'"
%token <punctuation> BACKSLASH "\\`[\\]\\'"

%%

;; Escape the ,@ below because the reader doesn't correctly detect
;; old-style backquotes for this case.  The backslashes can be removed
;; once old-style backquotes are completely gone (probably in
;; Emacs 28).

Makefile : bol newline (nil)
	 | bol variable
	   ( \,@$2 )
	 | bol rule
	   ( \,@$2 )
	 | bol conditional
	   ( \,@$2 )
	 | bol include
	   ( \,@$2 )
	 | whitespace ( nil )
	 | newline ( nil )
	 ;

variable: symbol opt-whitespace equals opt-whitespace element-list
	  (VARIABLE-TAG ,$1 nil ,$5)
	;

rule: targets opt-whitespace colons opt-whitespace element-list commands
      (FUNCTION-TAG ,$1 nil ,$5)
    ;

targets: target opt-whitespace targets
	 ( (car ,$1) (car ,@$3) )
       | target
	 ( (car ,$1) )
       ;

target: sub-target target
	( (concat (car ,$1) (car ,@$3) ) )
      | sub-target
	( (car ,$1) )
      ;

sub-target: symbol
	  | string
	  | varref
	  ;

conditional: IF some-whitespace symbol newline
	     ( nil )
	   | IFDEF some-whitespace symbol newline
	     ( nil )
	   | IFNDEF some-whitespace symbol newline
	     ( nil )
	   | IFEQ some-whitespace expression newline
	     ( nil )
	   | IFNEQ some-whitespace expression newline
	     ( nil )
	   | ELSE newline
	     ( nil )
	   | ENDIF newline
	     ( nil )
	   ;

expression : semantic-list
	   ;

include: INCLUDE some-whitespace element-list
	 (INCLUDE-TAG ,$3 nil)
       ;

equals: COLON EQUAL ()
      | PLUS EQUAL ()
      | EQUAL ()
      ;

colons: COLON COLON ()
      | COLON ()
      ;

element-list: elements newline
	      ( \,@$1 )
	    ;

elements: element some-whitespace elements
	  ( \,@$1 ,@$3 )
	| element
	  ( \,@$1 )
	| ;;EMPTY
	;

element: sub-element element
	 ( (concat (car ,$1) (car ,$2)) )
       | ;;EMPTY
       ;

sub-element: symbol
	   | string
	   | punctuation
	   | semantic-list
	     ( (buffer-substring-no-properties
		 (identity start) (identity end)) )
	   ;

varref: DOLLAR semantic-list
	( (buffer-substring-no-properties (identity start) (identity end)) )
      ;

commands: bol shell-command newline commands
	  ( ,$1 ,@$2 )
	| ;;EMPTY
	  ( )
	;

opt-whitespace : some-whitespace ( nil )
	       | ;;EMPTY
	       ;

some-whitespace : whitespace some-whitespace (nil)
		| whitespace (nil)
		;

;;; make.by ends here