Add initial implementation of R7RS modules

* module/Makefile.am (SOURCES): Add new files.
* module/scheme/base.scm:
* module/scheme/case-lambda.scm:
* module/scheme/char.scm:
* module/scheme/complex.scm:
* module/scheme/cxr.scm:
* module/scheme/eval.scm:
* module/scheme/file.scm:
* module/scheme/inexact.scm:
* module/scheme/lazy.scm:
* module/scheme/load.scm:
* module/scheme/process-context.scm:
* module/scheme/r5rs.scm:
* module/scheme/read.scm:
* module/scheme/repl.scm:
* module/scheme/time.scm:
* module/scheme/write.scm: New files.  Thanks to Göran Weinholt for
  akku-scm and OKUMURA Yuki for yuni, off of which some of these files
  were based.

1 files changed, 62 insertions, 0 deletions

diff --git a/module/scheme/inexact.scm b/module/scheme/inexact.scm
new file mode 100644
index 000000000..d597b1ad5
--- /dev/null
+++ b/module/scheme/inexact.scm
@@ -0,0 +1,62 @@
+;;; R7RS compatibility libraries
+;;; Copyright (C) 2019 Free Software Foundation, Inc.
+;;;
+;;; This library 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 3 of the
+;;; License, or (at your option) any later version.
+;;;
+;;; This library 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
+;;; <http://www.gnu.org/licenses/>.
+
+;;; Based on code from https://gitlab.com/akku/akku-scm, written
+;;; 2018-2019 by Göran Weinholt <goran@weinholt.se>, as well as
+;;; https://github.com/okuoku/yuni, written 2014-2018 by OKUMURA Yuki
+;;; <mjt@cltn.org>.  This code was originally released under the
+;;; following terms:
+;;;
+;;;     To the extent possible under law, the author(s) have dedicated
+;;;     all copyright and related and neighboring rights to this
+;;;     software to the public domain worldwide. This software is
+;;;     distributed without any warranty.
+;;;
+;;;     See <http://creativecommons.org/publicdomain/zero/1.0/>, for a
+;;;     copy of the CC0 Public Domain Dedication.
+
+(define-module (scheme inexact)
+  #:re-export ((exact->inexact . inexact)
+               (inexact->exact . exact)
+               acos asin atan cos exp sin sqrt tan)
+  #:export ((r7:finite? . finite?)
+            (r7:infinite? . infinite?)
+            (r7:nan? . nan?)
+            (r7:log . log)))
+
+(define (r7:finite? z)
+  (if (complex? z)
+      (and (finite? (real-part z))
+           (finite? (imag-part z)))
+      (finite? z)))
+
+(define (r7:infinite? z)
+  (if (complex? z)
+      (or (inf? (real-part z))
+          (inf? (imag-part z)))
+      (inf? z)))
+
+(define (r7:nan? z)
+  (if (complex? z)
+      (or (nan? (real-part z))
+          (nan? (imag-part z)))
+      (nan? z)))
+
+(define r7:log
+  (case-lambda
+   ((x) (log x))
+   ((x y) (/ (log x) (log y)))))