Add class MLKRatio.

1 files changed, 110 insertions, 0 deletions

diff --git a/MLKRatio.m b/MLKRatio.m
new file mode 100644
index 0000000..3685f1c
--- /dev/null
+++ b/MLKRatio.m
@@ -0,0 +1,110 @@
+/* -*- mode: objc; coding: utf-8 -*- */
+/* Étoilisp/Mulklisp, a Common Lisp subset for the Étoilé runtime.
+ * Copyright (C) 2008  Matthias Andreas Benkard.
+ *
+ * This program 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.
+ *
+ * This program 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/>.
+ */
+
+#import "MLKRatio.h"
+#import "util.h"
+
+#import <Foundation/NSString.h>
+
+@implementation MLKRatio
+-(MLKRatio *) initWithMPQ:(mpq_t)mpq
+{
+  self = [super init];
+  mpq_init (value);
+  mpq_set (value, mpq);
+  return self;
+}
+
++(MLKRatio *) ratioWithMPQ:(mpq_t)mpq
+{
+  return AUTORELEASE ([[MLKRatio alloc] initWithMPQ:mpq]);
+}
+
+-(MLKRatio *) initWithString:(NSString *)string
+                        base:(unsigned int)base
+{
+  self = [super init];
+  mpq_init (value);
+  mpq_set_str (value, [string UTF8String], 10);
+  return self;
+}
+
+-(MLKRatio *) initWithNumeratorString:(NSString *)numerString
+                    denominatorString:(NSString *)denomString
+                             negative:(BOOL)negative
+                                 base:(unsigned int)base
+{
+  return [self initWithString:[NSString stringWithFormat:@"%c%@/%@",
+                                        (negative ? '-' : '+'),
+                                        numerString,
+                                        denomString]
+               base:base];
+}
+  
++(MLKRatio *) ratioWithNumeratorString:(NSString *)numerString
+                     denominatorString:(NSString *)denomString
+                              negative:(BOOL)negative
+                                  base:(unsigned int)base
+{
+  return AUTORELEASE ([[MLKRatio alloc] initWithNumeratorString:numerString
+                                        denominatorString:denomString
+                                        negative:negative
+                                        base:base]);
+}
+
+#define DEFINE_MPQ_TWOARG_OPERATION(SELECTOR, GMPFUN)                   \
+  DEFINE_GMP_OPERATION (SELECTOR (MLKRatio *)arg,                       \
+                        mpq,                                            \
+                        GMPFUN (mpval, self->value, arg->value),        \
+                        MLKRatio,                                       \
+                        ratioWithMPQ:)
+
+DEFINE_MPQ_TWOARG_OPERATION (add:, mpq_add)
+DEFINE_MPQ_TWOARG_OPERATION (subtract:, mpq_sub)
+DEFINE_MPQ_TWOARG_OPERATION (multiplyWith:, mpq_mul)
+DEFINE_MPQ_TWOARG_OPERATION (divideBy:, mpq_div)
+
+-(double) doubleValue
+{
+  return mpq_get_d (value);
+}
+
+-(NSString *) description
+{
+  return [self descriptionWithBase:10];
+}
+
+-(NSString *) descriptionWithBase:(int)base
+{
+  NSString *str;
+  char cstr[mpz_sizeinbase (mpq_numref(self->value), base)
+            + mpz_sizeinbase (mpq_denref(self->value), base)
+            + 3];
+
+  mpq_get_str (cstr, base, self->value);
+  str = [NSString stringWithUTF8String:cstr];
+  
+  return str;
+}
+
+-(void) dealloc
+{
+  mpq_clear (value);
+  [super dealloc];
+}
+@end