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;; Support for parsing Makefiles
;; Copyright (C) 2016 g10 Code GmbH
;;
;; This file is part of Libgpg-error.
;;
;; Libgpg-error is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public License
;; as published by the Free Software Foundation; either version 2.1 of
;; the License, or (at your option) any later version.
;;
;; Libgpg-error 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
;; Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public
;; License along with this program; if not, see <https://www.gnu.org/licenses/>.
(define (parse-makefile port key)
(define (is-continuation? tokens)
(string=? (last tokens) "\\"))
(define (valid-token? s)
(< 0 (string-length s)))
(define (drop-continuations tokens)
(let loop ((acc '()) (tks tokens))
(if (null? tks)
(reverse acc)
(loop (if (string=? "\\" (car tks))
acc
(cons (car tks) acc)) (cdr tks)))))
(let next ((acc '()) (found #f))
(let ((line (read-line port)))
(if (eof-object? line)
acc
(let ((tokens (filter valid-token?
(string-splitp (string-trim char-whitespace?
line)
char-whitespace? -1))))
(cond
((or (null? tokens)
(string-prefix? (car tokens) "#")
(and (not found) (not (and (string=? key (car tokens))
(string=? "=" (cadr tokens))))))
(next acc found))
((not found)
(assert (and (string=? key (car tokens))
(string=? "=" (cadr tokens))))
(if (is-continuation? tokens)
(next (drop-continuations (cddr tokens)) #t)
(drop-continuations (cddr tokens))))
(else
(assert found)
(if (is-continuation? tokens)
(next (append acc (drop-continuations tokens)) found)
(append acc (drop-continuations tokens))))))))))
(define (parse-makefile-expand filename expand key)
(define (variable? v)
(and (string-prefix? v "$(") (string-suffix? v ")")))
(let expand-all ((values (parse-makefile (open-input-file filename) key)))
(if (any variable? values)
(expand-all
(let expand-one ((acc '()) (v values))
(cond
((null? v)
acc)
((variable? (car v))
(let ((makefile (open-input-file filename))
(key (substring (car v) 2 (- (string-length (car v)) 1))))
(expand-one (append acc (expand filename makefile key))
(cdr v))))
(else
(expand-one (append acc (list (car v))) (cdr v))))))
values)))
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