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/*
* Copyright © 2016 Keith Packard <keithp@keithp.com>
*
* 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 2 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.
*/
#include "ao_scheme.h"
struct ao_scheme_funcs {
void (*write)(ao_poly);
void (*display)(ao_poly);
};
static const struct ao_scheme_funcs ao_scheme_funcs[AO_SCHEME_NUM_TYPE] = {
[AO_SCHEME_CONS] = {
.write = ao_scheme_cons_write,
.display = ao_scheme_cons_display,
},
[AO_SCHEME_STRING] = {
.write = ao_scheme_string_write,
.display = ao_scheme_string_display,
},
[AO_SCHEME_INT] = {
.write = ao_scheme_int_write,
.display = ao_scheme_int_write,
},
[AO_SCHEME_ATOM] = {
.write = ao_scheme_atom_write,
.display = ao_scheme_atom_write,
},
[AO_SCHEME_BUILTIN] = {
.write = ao_scheme_builtin_write,
.display = ao_scheme_builtin_write,
},
[AO_SCHEME_FRAME] = {
.write = ao_scheme_frame_write,
.display = ao_scheme_frame_write,
},
[AO_SCHEME_FRAME_VALS] = {
.write = NULL,
.display = NULL,
},
[AO_SCHEME_LAMBDA] = {
.write = ao_scheme_lambda_write,
.display = ao_scheme_lambda_write,
},
[AO_SCHEME_STACK] = {
.write = ao_scheme_stack_write,
.display = ao_scheme_stack_write,
},
[AO_SCHEME_BOOL] = {
.write = ao_scheme_bool_write,
.display = ao_scheme_bool_write,
},
[AO_SCHEME_BIGINT] = {
.write = ao_scheme_bigint_write,
.display = ao_scheme_bigint_write,
},
[AO_SCHEME_FLOAT] = {
.write = ao_scheme_float_write,
.display = ao_scheme_float_write,
},
};
static const struct ao_scheme_funcs *
funcs(ao_poly p)
{
uint8_t type = ao_scheme_poly_type(p);
if (type < AO_SCHEME_NUM_TYPE)
return &ao_scheme_funcs[type];
return NULL;
}
void
ao_scheme_poly_write(ao_poly p)
{
const struct ao_scheme_funcs *f = funcs(p);
if (f && f->write)
f->write(p);
}
void
ao_scheme_poly_display(ao_poly p)
{
const struct ao_scheme_funcs *f = funcs(p);
if (f && f->display)
f->display(p);
}
void *
ao_scheme_ref(ao_poly poly) {
if (poly == AO_SCHEME_NIL)
return NULL;
if (poly & AO_SCHEME_CONST)
return (void *) (ao_scheme_const + (poly & AO_SCHEME_REF_MASK) - 4);
return (void *) (ao_scheme_pool + (poly & AO_SCHEME_REF_MASK) - 4);
}
ao_poly
ao_scheme_poly(const void *addr, ao_poly type) {
const uint8_t *a = addr;
if (a == NULL)
return AO_SCHEME_NIL;
if (AO_SCHEME_IS_CONST(a))
return AO_SCHEME_CONST | (a - ao_scheme_const + 4) | type;
return (a - ao_scheme_pool + 4) | type;
}
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