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https://github.com/Gnucash/gnucash.git
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e0300d3a62
This allows direct conversion between Scheme numbers and gnc_numeric without the performance or accuracy penalties arising from using doubles as an intermediary.
78 lines
2.9 KiB
Scheme
78 lines
2.9 KiB
Scheme
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; gnc-numeric.scm : rational number representation for gnucash
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;; Copyright 2000 Bill Gribble <grib@gnumatic.com>
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;; Copyright 2001 Christian Stimming <stimming@tu-harburg.de>
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;;
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation; either version 2 of
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;; the License, or (at your option) any later version.
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;;
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;; This program 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, contact:
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;;
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;; Free Software Foundation Voice: +1-617-542-5942
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;; 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652
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;; Boston, MA 02110-1301, USA gnu@gnu.org
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; use 'logior' in guile to bit-combine RND and DENOM flags.
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(define GNC-RND-FLOOR 1)
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(define GNC-RND-CEIL 2)
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(define GNC-RND-TRUNC 3)
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(define GNC-RND-PROMOTE 4)
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(define GNC-RND-ROUND-HALF-DOWN 5)
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(define GNC-RND-ROUND-HALF-UP 6)
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(define GNC-RND-ROUND 7)
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(define GNC-RND-NEVER 8)
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(define GNC-DENOM-AUTO 0)
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(define GNC-DENOM-REDUCE 32)
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(define GNC-DENOM-FIXED 64)
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(define GNC-DENOM-LCD 48)
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(define GNC-DENOM-SIGFIG 80)
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(define (GNC-DENOM-SIGFIGS n)
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(logior GNC-DENOM-SIGFIG (* n 256)))
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(define GNC-ERROR-OK 0)
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(define GNC-ERROR-ARG -1)
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(define GNC-ERROR-OVERFLOW -2)
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(define GNC-ERROR-DENOM-DIFF -3)
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(define GNC-ERROR-REMAINDER -4)
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(define <gnc-monetary>
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(make-record-type "<gnc-monetary>"
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'(commodity amount)))
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;; Constructor; takes one <gnc:commodity*> and one <gnc-numeric>
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(define (gnc:make-gnc-monetary c a)
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;;FIXME: we used to type-check the values, like:
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;; (gw:wcp-is-of-type? <gnc:commodity*> c)
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(if (and #t (number? a))
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((record-constructor <gnc-monetary>) c a)
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(warn "wrong arguments for gnc:make-gnc-monetary: " c a)))
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(define gnc:gnc-monetary?
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(record-predicate <gnc-monetary>))
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(define gnc:gnc-monetary-commodity
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(record-accessor <gnc-monetary> 'commodity))
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(define gnc:gnc-monetary-amount
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(record-accessor <gnc-monetary> 'amount))
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(define (gnc:monetary-neg a)
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(if (gnc:gnc-monetary? a)
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(gnc:make-gnc-monetary
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(gnc:gnc-monetary-commodity a)
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(gnc-numeric-neg (gnc:gnc-monetary-amount a)))
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(warn "wrong arguments for gnc:monetary-neg: " a)))
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