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   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 #ifdef AO_SCHEME_FEATURE_FLOAT
  19
  20 static void float_mark(void *addr)
  21 {
  22         (void) addr;
  23 }
  24
  25 static int float_size(void *addr)
  26 {
  27         if (!addr)
  28                 return 0;
  29         return sizeof (struct ao_scheme_float);
  30 }
  31
  32 static void float_move(void *addr)
  33 {
  34         (void) addr;
  35 }
  36
  37 const struct ao_scheme_type ao_scheme_float_type = {
  38         .mark = float_mark,
  39         .size = float_size,
  40         .move = float_move,
  41         .name = "float",
  42 };
  43
  44 #ifndef FLOAT_FORMAT
  45 #define FLOAT_FORMAT "%g"
  46 #endif
  47
  48 void
  49 ao_scheme_float_write(ao_poly p, bool write)
  50 {
  51         struct ao_scheme_float *f = ao_scheme_poly_float(p);
  52         float   v = f->value;
  53
  54         (void) write;
  55         if (isnanf(v))
  56                 printf("+nan.0");
  57         else if (isinff(v)) {
  58                 if (v < 0)
  59                         printf("-");
  60                 else
  61                         printf("+");
  62                 printf("inf.0");
  63         } else
  64                 printf (FLOAT_FORMAT, v);
  65 }
  66
  67 float
  68 ao_scheme_poly_number(ao_poly p)
  69 {
  70         switch (ao_scheme_poly_base_type(p)) {
  71         case AO_SCHEME_INT:
  72                 return ao_scheme_poly_int(p);
  73         case AO_SCHEME_BIGINT:
  74                 return ao_scheme_poly_bigint(p)->value;
  75         case AO_SCHEME_OTHER:
  76                 switch (ao_scheme_other_type(ao_scheme_poly_other(p))) {
  77                 case AO_SCHEME_FLOAT:
  78                         return ao_scheme_poly_float(p)->value;
  79                 }
  80         }
  81         return NAN;
  82 }
  83
  84 ao_poly
  85 ao_scheme_float_get(float value)
  86 {
  87         struct ao_scheme_float  *f;
  88
  89         f = ao_scheme_alloc(sizeof (struct ao_scheme_float));
  90         f->type = AO_SCHEME_FLOAT;
  91         f->value = value;
  92         return ao_scheme_float_poly(f);
  93 }
  94
  95 ao_poly
  96 ao_scheme_do_inexactp(struct ao_scheme_cons *cons)
  97 {
  98         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
  99                 return AO_SCHEME_NIL;
 100         if (ao_scheme_poly_type(ao_scheme_arg(cons, 0)) == AO_SCHEME_FLOAT)
 101                 return _ao_scheme_bool_true;
 102         return _ao_scheme_bool_false;
 103 }
 104
 105 ao_poly
 106 ao_scheme_do_finitep(struct ao_scheme_cons *cons)
 107 {
 108         ao_poly value;
 109         float   f;
 110
 111         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
 112                 return AO_SCHEME_NIL;
 113         value = ao_scheme_arg(cons, 0);
 114         switch (ao_scheme_poly_type(value)) {
 115         case AO_SCHEME_INT:
 116         case AO_SCHEME_BIGINT:
 117                 return _ao_scheme_bool_true;
 118         case AO_SCHEME_FLOAT:
 119                 f = ao_scheme_poly_float(value)->value;
 120                 if (!isnan(f) && !isinf(f))
 121                         return _ao_scheme_bool_true;
 122         }
 123         return _ao_scheme_bool_false;
 124 }
 125
 126 ao_poly
 127 ao_scheme_do_infinitep(struct ao_scheme_cons *cons)
 128 {
 129         ao_poly value;
 130         float   f;
 131
 132         if (!ao_scheme_check_argc(_ao_scheme_atom_led, cons, 1, 1))
 133                 return AO_SCHEME_NIL;
 134         value = ao_scheme_arg(cons, 0);
 135         switch (ao_scheme_poly_type(value)) {
 136         case AO_SCHEME_FLOAT:
 137                 f = ao_scheme_poly_float(value)->value;
 138                 if (isinf(f))
 139                         return _ao_scheme_bool_true;
 140         }
 141         return _ao_scheme_bool_false;
 142 }
 143
 144 ao_poly
 145 ao_scheme_do_sqrt(struct ao_scheme_cons *cons)
 146 {
 147         ao_poly value;
 148
 149         if (!ao_scheme_check_argc(_ao_scheme_atom_sqrt, cons, 1, 1))
 150                 return AO_SCHEME_NIL;
 151         value = ao_scheme_arg(cons, 0);
 152         if (!ao_scheme_number_typep(ao_scheme_poly_type(value)))
 153                 return ao_scheme_error(AO_SCHEME_INVALID, "%s: non-numeric", ao_scheme_poly_atom(_ao_scheme_atom_sqrt)->name);
 154         return ao_scheme_float_get(sqrtf(ao_scheme_poly_number(value)));
 155 }
 156 #endif