1 files changed, 76 insertions, 0 deletions
diff --git a/tests/gpgscm/makefile.scm b/tests/gpgscm/makefile.scm
new file mode 100644
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+++ b/tests/gpgscm/makefile.scm
@@ -0,0 +1,76 @@
+;; Support for parsing Makefiles
+;;
+;; Copyright (C) 2016 g10 Code GmbH
+;;
+;; This file is part of GnuPG.
+;;
+;; GnuPG 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.
+;;
+;; GnuPG 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 this program; if not, see <http://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)))