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

   1 /*
   2  * Copyright © 2016 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
  17 struct ao_scheme_funcs {
  18         void (*write)(ao_poly);
  19         void (*display)(ao_poly);
  20 };
  21
  22 static const struct ao_scheme_funcs ao_scheme_funcs[AO_SCHEME_NUM_TYPE] = {
  23         [AO_SCHEME_CONS] = {
  24                 .write = ao_scheme_cons_write,
  25                 .display = ao_scheme_cons_display,
  26         },
  27         [AO_SCHEME_STRING] = {
  28                 .write = ao_scheme_string_write,
  29                 .display = ao_scheme_string_display,
  30         },
  31         [AO_SCHEME_INT] = {
  32                 .write = ao_scheme_int_write,
  33                 .display = ao_scheme_int_write,
  34         },
  35         [AO_SCHEME_ATOM] = {
  36                 .write = ao_scheme_atom_write,
  37                 .display = ao_scheme_atom_write,
  38         },
  39         [AO_SCHEME_BUILTIN] = {
  40                 .write = ao_scheme_builtin_write,
  41                 .display = ao_scheme_builtin_write,
  42         },
  43         [AO_SCHEME_FRAME] = {
  44                 .write = ao_scheme_frame_write,
  45                 .display = ao_scheme_frame_write,
  46         },
  47         [AO_SCHEME_FRAME_VALS] = {
  48                 .write = NULL,
  49                 .display = NULL,
  50         },
  51         [AO_SCHEME_LAMBDA] = {
  52                 .write = ao_scheme_lambda_write,
  53                 .display = ao_scheme_lambda_write,
  54         },
  55         [AO_SCHEME_STACK] = {
  56                 .write = ao_scheme_stack_write,
  57                 .display = ao_scheme_stack_write,
  58         },
  59         [AO_SCHEME_BOOL] = {
  60                 .write = ao_scheme_bool_write,
  61                 .display = ao_scheme_bool_write,
  62         },
  63         [AO_SCHEME_BIGINT] = {
  64                 .write = ao_scheme_bigint_write,
  65                 .display = ao_scheme_bigint_write,
  66         },
  67         [AO_SCHEME_FLOAT] = {
  68                 .write = ao_scheme_float_write,
  69                 .display = ao_scheme_float_write,
  70         },
  71 };
  72
  73 static const struct ao_scheme_funcs *
  74 funcs(ao_poly p)
  75 {
  76         uint8_t type = ao_scheme_poly_type(p);
  77
  78         if (type < AO_SCHEME_NUM_TYPE)
  79                 return &ao_scheme_funcs[type];
  80         return NULL;
  81 }
  82
  83 void
  84 ao_scheme_poly_write(ao_poly p)
  85 {
  86         const struct ao_scheme_funcs *f = funcs(p);
  87
  88         if (f && f->write)
  89                 f->write(p);
  90 }
  91
  92 void
  93 ao_scheme_poly_display(ao_poly p)
  94 {
  95         const struct ao_scheme_funcs *f = funcs(p);
  96
  97         if (f && f->display)
  98                 f->display(p);
  99 }
 100
 101 void *
 102 ao_scheme_ref(ao_poly poly) {
 103         if (poly == AO_SCHEME_NIL)
 104                 return NULL;
 105         if (poly & AO_SCHEME_CONST)
 106                 return (void *) (ao_scheme_const + (poly & AO_SCHEME_REF_MASK) - 4);
 107         return (void *) (ao_scheme_pool + (poly & AO_SCHEME_REF_MASK) - 4);
 108 }
 109
 110 ao_poly
 111 ao_scheme_poly(const void *addr, ao_poly type) {
 112         const uint8_t   *a = addr;
 113         if (a == NULL)
 114                 return AO_SCHEME_NIL;
 115         if (AO_SCHEME_IS_CONST(a))
 116                 return AO_SCHEME_CONST | (a - ao_scheme_const + 4) | type;
 117         return (a - ao_scheme_pool + 4) | type;
 118 }