mirror of
git://git.gnupg.org/gnupg.git
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77 lines
2.5 KiB
Scheme
77 lines
2.5 KiB
Scheme
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;; Support for parsing Makefiles
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;;
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;; Copyright (C) 2016 g10 Code GmbH
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;;
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;; This file is part of GnuPG.
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;;
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;; GnuPG is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 3 of the License, or
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;; (at your option) any later version.
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;;
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;; GnuPG is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, see <http://www.gnu.org/licenses/>.
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(define (parse-makefile port key)
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(define (is-continuation? tokens)
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(string=? (last tokens) "\\"))
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(define (valid-token? s)
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(< 0 (string-length s)))
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(define (drop-continuations tokens)
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(let loop ((acc '()) (tks tokens))
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(if (null? tks)
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(reverse acc)
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(loop (if (string=? "\\" (car tks))
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acc
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(cons (car tks) acc)) (cdr tks)))))
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(let next ((acc '()) (found #f))
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(let ((line (read-line port)))
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(if (eof-object? line)
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acc
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(let ((tokens (filter valid-token?
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(string-splitp (string-trim char-whitespace?
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line)
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char-whitespace? -1))))
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(cond
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((or (null? tokens)
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(string-prefix? (car tokens) "#")
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(and (not found) (not (and (string=? key (car tokens))
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(string=? "=" (cadr tokens))))))
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(next acc found))
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((not found)
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(assert (and (string=? key (car tokens))
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(string=? "=" (cadr tokens))))
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(if (is-continuation? tokens)
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(next (drop-continuations (cddr tokens)) #t)
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(drop-continuations (cddr tokens))))
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(else
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(assert found)
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(if (is-continuation? tokens)
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(next (append acc (drop-continuations tokens)) found)
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(append acc (drop-continuations tokens))))))))))
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(define (parse-makefile-expand filename expand key)
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(define (variable? v)
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(and (string-prefix? v "$(") (string-suffix? v ")")))
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(let expand-all ((values (parse-makefile (open-input-file filename) key)))
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(if (any variable? values)
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(expand-all
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(let expand-one ((acc '()) (v values))
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(cond
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((null? v)
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acc)
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((variable? (car v))
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(let ((makefile (open-input-file filename))
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(key (substring (car v) 2 (- (string-length (car v)) 1))))
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(expand-one (append acc (expand filename makefile key))
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(cdr v))))
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(else
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(expand-one (append acc (list (car v))) (cdr v))))))
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values)))
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