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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_lisp.h"
struct ao_lisp_funcs {
void (*write)(ao_poly);
void (*display)(ao_poly);
};
static const struct ao_lisp_funcs ao_lisp_funcs[AO_LISP_NUM_TYPE] = {
[AO_LISP_CONS] = {
.write = ao_lisp_cons_write,
.display = ao_lisp_cons_display,
},
[AO_LISP_STRING] = {
.write = ao_lisp_string_write,
.display = ao_lisp_string_display,
},
[AO_LISP_INT] = {
.write = ao_lisp_int_write,
.display = ao_lisp_int_write,
},
[AO_LISP_ATOM] = {
.write = ao_lisp_atom_write,
.display = ao_lisp_atom_write,
},
[AO_LISP_BUILTIN] = {
.write = ao_lisp_builtin_write,
.display = ao_lisp_builtin_write,
},
[AO_LISP_FRAME] = {
.write = ao_lisp_frame_write,
.display = ao_lisp_frame_write,
},
[AO_LISP_LAMBDA] = {
.write = ao_lisp_lambda_write,
.display = ao_lisp_lambda_write,
},
[AO_LISP_STACK] = {
.write = ao_lisp_stack_write,
.display = ao_lisp_stack_write,
},
[AO_LISP_BOOL] = {
.write = ao_lisp_bool_write,
.display = ao_lisp_bool_write,
},
};
static const struct ao_lisp_funcs *
funcs(ao_poly p)
{
uint8_t type = ao_lisp_poly_type(p);
if (type < AO_LISP_NUM_TYPE)
return &ao_lisp_funcs[type];
return NULL;
}
void
ao_lisp_poly_write(ao_poly p)
{
const struct ao_lisp_funcs *f = funcs(p);
if (f && f->write)
f->write(p);
}
void
ao_lisp_poly_display(ao_poly p)
{
const struct ao_lisp_funcs *f = funcs(p);
if (f && f->display)
f->display(p);
}
void *
ao_lisp_ref(ao_poly poly) {
if (poly == AO_LISP_NIL)
return NULL;
if (poly & AO_LISP_CONST)
return (void *) (ao_lisp_const + (poly & AO_LISP_REF_MASK) - 4);
return (void *) (ao_lisp_pool + (poly & AO_LISP_REF_MASK) - 4);
}
ao_poly
ao_lisp_poly(const void *addr, ao_poly type) {
const uint8_t *a = addr;
if (a == NULL)
return AO_LISP_NIL;
if (AO_LISP_IS_CONST(a))
return AO_LISP_CONST | (a - ao_lisp_const + 4) | type;
return (a - ao_lisp_pool + 4) | type;
}
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