git.gag.com Git - fw/altos/blob - src/scheme/ao_scheme_float.c

   1 /*
   2  * Copyright © 2017 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 #include "ao_scheme.h"
  16 #include <math.h>
  17
  18 static void float_mark(void *addr)
  19 {
  20         (void) addr;
  21 }
  22
  23 static int float_size(void *addr)
  24 {
  25         if (!addr)
  26                 return 0;
  27         return sizeof (struct ao_scheme_float);
  28 }
  29
  30 static void float_move(void *addr)
  31 {
  32         (void) addr;
  33 }
  34
  35 const struct ao_scheme_type ao_scheme_float_type = {
  36         .mark = float_mark,
  37         .size = float_size,
  38         .move = float_move,
  39         .name = "float",
  40 };
  41
  42 void
  43 ao_scheme_float_write(ao_poly p)
  44 {
  45         struct ao_scheme_float *f = ao_scheme_poly_float(p);
  46         float   v = f->value;
  47
  48         if (isnanf(v))
  49                 printf("+nan.0");
  50         else if (isinff(v)) {
  51                 if (v < 0)
  52                         printf("-");
  53                 else
  54                         printf("+");
  55                 printf("inf.0");
  56         } else
  57                 printf ("%g", f->value);
  58 }
  59
  60 float
  61 ao_scheme_poly_number(ao_poly p)
  62 {
  63         switch (ao_scheme_poly_base_type(p)) {
  64         case AO_SCHEME_INT:
  65                 return ao_scheme_poly_int(p);
  66         case AO_SCHEME_OTHER:
  67                 switch (ao_scheme_other_type(ao_scheme_poly_other(p))) {
  68                 case AO_SCHEME_BIGINT:
  69                         return ao_scheme_bigint_int(ao_scheme_poly_bigint(p)->value);
  70                 case AO_SCHEME_FLOAT:
  71                         return ao_scheme_poly_float(p)->value;
  72                 }
  73         }
  74         return NAN;
  75 }
  76
  77 ao_poly
  78 ao_scheme_float_get(float value)
  79 {
  80         struct ao_scheme_float  *f;
  81
  82         f = ao_scheme_alloc(sizeof (struct ao_scheme_float));
  83         f->type = AO_SCHEME_FLOAT;
  84         f->value = value;
  85         return ao_scheme_float_poly(f);
  86 }
  87
  88 ao_poly
  89 ao_scheme_do_inexactp(struct ao_scheme_cons *cons)
  90 {
  91         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
  92                 return AO_SCHEME_NIL;
  93         if (ao_scheme_poly_type(ao_scheme_arg(cons, 0)) == AO_SCHEME_FLOAT)
  94                 return _ao_scheme_bool_true;
  95         return _ao_scheme_bool_false;
  96 }
  97
  98 ao_poly
  99 ao_scheme_do_finitep(struct ao_scheme_cons *cons)
 100 {
 101         ao_poly value;
 102         float   f;
 103
 104         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
 105                 return AO_SCHEME_NIL;
 106         value = ao_scheme_arg(cons, 0);
 107         switch (ao_scheme_poly_type(value)) {
 108         case AO_SCHEME_INT:
 109         case AO_SCHEME_BIGINT:
 110                 return _ao_scheme_bool_true;
 111         case AO_SCHEME_FLOAT:
 112                 f = ao_scheme_poly_float(value)->value;
 113                 if (!isnan(f) && !isinf(f))
 114                         return _ao_scheme_bool_true;
 115         }
 116         return _ao_scheme_bool_false;
 117 }
 118
 119 ao_poly
 120 ao_scheme_do_infinitep(struct ao_scheme_cons *cons)
 121 {
 122         ao_poly value;
 123         float   f;
 124
 125         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
 126                 return AO_SCHEME_NIL;
 127         value = ao_scheme_arg(cons, 0);
 128         switch (ao_scheme_poly_type(value)) {
 129         case AO_SCHEME_FLOAT:
 130                 f = ao_scheme_poly_float(value)->value;
 131                 if (isinf(f))
 132                         return _ao_scheme_bool_true;
 133         }
 134         return _ao_scheme_bool_false;
 135 }
 136
 137 ao_poly
 138 ao_scheme_do_sqrt(struct ao_scheme_cons *cons)
 139 {
 140         ao_poly value;
 141
 142         if (!ao_scheme_check_argc(_ao_scheme_atom_sqrt, cons, 1, 1))
 143                 return AO_SCHEME_NIL;
 144         value = ao_scheme_arg(cons, 0);
 145         if (!ao_scheme_number_typep(ao_scheme_poly_type(value)))
 146                 return ao_scheme_error(AO_SCHEME_INVALID, "%s: non-numeric", ao_scheme_poly_atom(_ao_scheme_atom_sqrt)->name);
 147         return ao_scheme_float_get(sqrtf(ao_scheme_poly_number(value)));
 148 }