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kernel.c
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/*
* kernel.c -- An actor-based implementation of John Shutt's "Kernel" language
*
* Copyright 2012-2017 Dale Schumacher. ALL RIGHTS RESERVED.
*/
static char _Program[] = "Kernel";
static char _Version[] = "2017-12-01";
static char _Copyright[] = "Copyright 2012-2017 Dale Schumacher";
#include <getopt.h>
#include "kernel.h"
#include "dbug.h"
DBUG_UNIT("kernel");
/* performance optimization switches */
#define OPT_APPL_UNWRAP 1
#define OPT_INLINE_COMB 1
#define OPT_AS_TUPLE 1
#define OPT_MATCH_PTREE 1
static int M_limit = 1000 * 1000; /* actor messaging dispatch limit */
static BEH_PROTO; /* ==== GLOBAL ACTOR CONFIGURATION ==== */
static FILE* input_file = NULL;
static FILE* output_file = NULL;
/* WARNING! THESE GLOBAL ACTORS MUST BE INITIALIZED IN EACH CONFIGURATION */
static CONS* a_sink;
static CONS* a_inert;
static CONS* a_true;
static CONS* a_false;
static CONS* a_nil;
static CONS* a_ignore;
static CONS* a_kernel_env;
static CONS* a_ground_env;
static CONS* intern_map; /* pr(value->const, name->symbol) */
typedef CONS* (*LAMBDA_x)(CONS* x);
typedef CONS* (*LAMBDA_x_y)(CONS* x, CONS* y);
typedef CONS* (*LAMBDA_x_y_z)(CONS* x, CONS* y, CONS* z);
#define ENSURE(invariant) if (!(invariant)) { \
THROW(pr(ATOM("AT"), pr(ATOM(__FILE__), NUMBER(__LINE__)))); \
DBUG_RETURN; \
} (void)0
#define THROW(msg) SEND(ACTOR(throw_beh, NIL), (msg))
static BEH_DECL(cons_type); /* forward */
static BEH_DECL(pair_type); /* forward */
static BEH_DECL(env_type); /* forward */
static BEH_DECL(brand_type); /* forward */
static BEH_DECL(sealed_type); /* forward */
/* extract ABE values from Kernel actors */
static CONS* number_value(CONS* number); /* forward */
static CONS* cons_value(CONS* pair); /* forward */
BOOL
eq(CONS* x, CONS* y)
{
if (x == y) {
return TRUE;
}
if (nilp(x) || nilp(y)) {
return FALSE;
}
if (actorp(x) && actorp(y)) {
x = MK_CONS(x);
y = MK_CONS(y);
if (car(x) == car(y)) { /* behaviors match */
if ((car(x) == MK_FUNC(cons_type))
|| (car(x) == MK_FUNC(env_type))
|| (car(x) == MK_FUNC(brand_type))
|| (car(x) == MK_FUNC(sealed_type))) {
return FALSE; /* mutable/sealed types must remain distinct */
}
return (eq(cdr(x), cdr(y)));
}
return FALSE;
}
if (consp(x) && consp(y)) {
return (eq(car(x), car(y)) && eq(cdr(x), cdr(y)));
}
return FALSE;
}
/*
($define! equal?
($lambda (x y)
($if (pair? x)
($if (equal? (car x) (car y))
(equal? (cdr x) (cdr y))
#f)
(eq? x y))))
*/
BOOL
eq_now(CONS* x, CONS* y) /* same value now, even if mutable */
{
if (eq(x, y)) {
return TRUE;
}
x = cons_value(x);
y = cons_value(y);
if (is_pr(x) && is_pr(y)) {
return (eq_now(hd(x), hd(y)) && eq_now(tl(x), tl(y)));
}
return FALSE;
}
/**
throw_beh = \msg.[
# report an exception
]
**/
static
BEH_DECL(throw_beh)
{
char* msg = cons_to_str(WHAT);
DBUG_ENTER("throw_beh");
DBUG_PRINT("FAIL!", ("%s", msg));
fprintf(output_file, "FAIL! %s\n", msg);
fflush(output_file);
DBUG_RETURN;
}
/**
abort_beh = \msg.[
# print message and abort
]
**/
static
BEH_DECL(abort_beh)
{
char* msg = cons_to_str(WHAT);
DBUG_ENTER("abort_beh");
DBUG_PRINT("ABORT!", ("%s", msg));
fprintf(stderr, "ABORT! %s\n", msg);
abort();
DBUG_RETURN;
}
static char*
printable(CONS* p) /* WARNING! you must free this storage manually */
{
char* s;
char* t;
s = cons_to_str(p); /* pointer to static buffer */
if (atomp(p)) { ++s; } /* skip leading '#' */
t = NEWxN(char, strlen(s) + 1);
return strcpy(t, s);
}
typedef struct sink_t SINK;
struct sink_t {
CONS* context;
CONS* (*put)(SINK*, CONS*); /* transmit value, return a_true on success */
CONS* (*put_cstr)(SINK*, char*); /* transmit C-string, a_true on success */
};
CONS*
file_put(SINK* sink, CONS* value)
{
FILE* f;
int c;
CONS* ok;
DBUG_ENTER("file_put");
assert(numberp(value));
XDBUG_PRINT("stdout", ("%p", stdout));
XDBUG_PRINT("stderr", ("%p", stderr));
XDBUG_PRINT("output_file", ("%p", output_file));
if (sink->context == MK_REF(output_file)) {
f = output_file; /* FIXME: WORKAROUND FOR FILE* ENCODING */
} else {
f = (FILE*)(MK_PTR(sink->context));
}
XDBUG_PRINT("f", ("%p", f));
c = MK_INT(value);
DBUG_PRINT("c", ((isprint(c) ? "%d '%c'" : "%d '\\x%X'"), c, c));
ok = ((fputc(c, f) == EOF) ? a_false : a_true);
XDBUG_PRINT("ok", ("%s", cons_to_str(ok)));
DBUG_RETURN ok;
}
CONS*
generic_put_cstr(SINK* sink, char* s)
{
int c;
DBUG_ENTER("generic_put_cstr");
assert(s != NULL);
DBUG_PRINT("s", ((s ? "\"%s\"" : "NULL"), s));
while ((c = *s++)) {
if((sink->put)(sink, NUMBER(c)) == a_false) {
DBUG_RETURN a_false;
}
}
DBUG_RETURN a_true;
}
SINK*
file_sink(FILE* f)
{
SINK* sink;
DBUG_ENTER("file_sink");
DBUG_PRINT("f", ("%p", f));
sink = NEW(SINK);
sink->context = MK_REF(f);
sink->put = file_put;
sink->put_cstr = generic_put_cstr;
DBUG_RETURN sink;
}
static SINK* current_sink;
typedef struct source_t SOURCE;
struct source_t {
CONS* context;
CONS* (*empty)(SOURCE*); /* return a_true if empty, else a_false */
CONS* (*get)(SOURCE*); /* return value at current position */
CONS* (*next)(SOURCE*); /* return current and advance position */
};
CONS*
string_empty(SOURCE* src)
{
char* s;
DBUG_ENTER("string_empty");
s = (char*)(MK_PTR(src->context));
DBUG_PRINT("s", ((s ? "\"%s\"" : "NULL"), s));
DBUG_RETURN ((s && *s) ? a_false : a_true);
}
CONS*
string_get(SOURCE* src)
{
char* s;
int c;
DBUG_ENTER("string_get");
if ((src->empty)(src) == a_true) {
DBUG_PRINT("c", ("EOF"));
DBUG_RETURN NUMBER(EOF);
}
s = (char*)(MK_PTR(src->context));
c = *s;
DBUG_PRINT("c", ((isprint(c) ? "%d '%c'" : "%d '\\x%X'"), c, c));
DBUG_RETURN NUMBER(c);
}
CONS*
string_next(SOURCE* src)
{
char* s;
CONS* c;
DBUG_ENTER("string_next");
c = (src->get)(src);
if (c == NUMBER(EOF)) {
DBUG_RETURN c;
}
s = (char*)(MK_PTR(src->context));
src->context = MK_REF(++s);
DBUG_PRINT("s", ((s ? "\"%s\"" : "NULL"), s));
DBUG_RETURN c;
}
SOURCE*
string_source(char* s)
{
SOURCE* src;
DBUG_ENTER("string_source");
DBUG_PRINT("s", ((s ? "\"%s\"" : "NULL"), s));
src = NEW(SOURCE);
src->context = MK_REF(s);
src->empty = string_empty;
src->get = string_get;
src->next = string_next;
DBUG_RETURN src;
}
CONS*
file_empty(SOURCE* src)
{
CONS* d;
DBUG_ENTER("file_empty");
d = (src->get)(src);
DBUG_RETURN ((d == NUMBER(EOF)) ? a_true : a_false);
}
CONS*
file_get(SOURCE* src)
{
CONS* d;
int c;
DBUG_ENTER("file_get");
DBUG_PRINT("context", ("%s", cons_to_str(src->context)));
d = tl(src->context);
if (nilp(d)) {
(src->next)(src);
d = tl(src->context);
}
c = MK_INT(d);
DBUG_PRINT("c", ((isprint(c) ? "%d '%c'" : "%d '\\x%X'"), c, c));
DBUG_RETURN d;
}
CONS*
file_next(SOURCE* src)
{
CONS* d;
FILE* f;
DBUG_ENTER("file_next");
d = tl(src->context);
if (d != NUMBER(EOF)) {
CONS* r = hd(src->context);
XDBUG_PRINT("stdin", ("%p", stdin));
XDBUG_PRINT("input_file", ("%p", input_file));
if (r == MK_REF(input_file)) {
f = input_file; /* FIXME: WORKAROUND FOR FILE* ENCODING */
} else {
f = (FILE*)(MK_PTR(r));
}
XDBUG_PRINT("f", ("%p", f));
rplacd(src->context, NUMBER(fgetc(f)));
}
DBUG_RETURN d;
}
SOURCE*
file_source(FILE* f)
{
SOURCE* src;
DBUG_ENTER("file_source");
assert(f != NULL);
DBUG_PRINT("f", ("%p", f));
src = NEW(SOURCE);
src->context = pr(MK_REF(f), NIL);
DBUG_PRINT("f'", ("%p", MK_PTR(hd(src->context))));
src->empty = file_empty;
src->get = file_get;
src->next = file_next;
DBUG_PRINT("context", ("%s", cons_to_str(src->context)));
DBUG_RETURN src;
}
static SOURCE* current_source;
/**
LET command_beh(msg) = \actor.[
SEND msg TO actor
]
**/
static
BEH_DECL(command_beh)
{
CONS* msg = MINE;
CONS* actor = WHAT;
DBUG_ENTER("command_beh");
DBUG_PRINT("msg", ("%s", cons_to_str(msg)));
DBUG_PRINT("actor", ("%s", cons_to_str(actor)));
ENSURE(actorp(actor));
SEND(actor, msg);
DBUG_RETURN;
}
/**
LET join_rest_beh(cust, k_rest, first) = \($k_rest, rest).[
SEND (first, rest) TO cust
]
**/
static
BEH_DECL(join_rest_beh)
{
CONS* state = MINE;
CONS* cust;
CONS* k_rest;
CONS* first;
CONS* msg = WHAT;
DBUG_ENTER("join_rest_beh");
assert(is_pr(state));
cust = hd(state);
assert(actorp(cust));
assert(is_pr(tl(state)));
k_rest = hd(tl(state));
first = tl(tl(state));
if (is_pr(msg)
&& (hd(msg) == k_rest)) {
CONS* rest = tl(msg);
DBUG_PRINT("first", ("%s", cons_to_str(first)));
DBUG_PRINT("rest", ("%s", cons_to_str(rest)));
SEND(cust, pr(first, rest));
}
DBUG_RETURN;
}
/**
LET join_first_beh(cust, k_first, rest) = \($k_first, first).[
SEND (first, rest) TO cust
]
**/
static
BEH_DECL(join_first_beh)
{
CONS* state = MINE;
CONS* cust;
CONS* k_first;
CONS* rest;
CONS* msg = WHAT;
DBUG_ENTER("join_first_beh");
assert(is_pr(state));
cust = hd(state);
assert(actorp(cust));
assert(is_pr(tl(state)));
k_first = hd(tl(state));
rest = tl(tl(state));
if (is_pr(msg)
&& (hd(msg) == k_first)) {
CONS* first = tl(msg);
DBUG_PRINT("first", ("%s", cons_to_str(first)));
DBUG_PRINT("rest", ("%s", cons_to_str(rest)));
SEND(cust, pr(first, rest));
}
DBUG_RETURN;
}
/**
LET join_beh(cust, k_first, k_rest) = \msg.[
CASE msg OF
($k_first, first) : [ # join_rest_beh
BECOME \($k_rest, rest).[ SEND (first, rest) TO cust ]
]
($k_rest, rest) : [ # join_first_beh
BECOME \($k_first, first).[ SEND (first, rest) TO cust ]
]
END
]
**/
static
BEH_DECL(join_beh)
{
CONS* state = MINE;
CONS* cust;
CONS* k_first;
CONS* k_rest;
CONS* msg = WHAT;
DBUG_ENTER("join_beh");
assert(is_pr(state));
cust = hd(state);
assert(actorp(cust));
assert(is_pr(tl(state)));
k_first = hd(tl(state));
k_rest = tl(tl(state));
if (is_pr(msg)) {
if (hd(msg) == k_first) {
BECOME(join_rest_beh, pr(cust, pr(k_rest, tl(msg))));
} else if (hd(msg) == k_rest) {
BECOME(join_first_beh, pr(cust, pr(k_first, tl(msg))));
}
}
DBUG_RETURN;
}
/**
LET tag_beh(cust) = \msg.[ SEND (SELF, msg) TO cust ]
**/
static
BEH_DECL(tag_beh)
{
CONS* cust = MINE;
CONS* msg = WHAT;
DBUG_ENTER("tag_beh");
assert(actorp(cust));
SEND(cust, pr(SELF, msg));
DBUG_RETURN;
}
/**
LET fork_beh(cust, head, tail) = \(h_req, t_req).[
CREATE k_head WITH tag_beh(SELF)
CREATE k_tail WITH tag_beh(SELF)
SEND (k_head, h_req) TO head
SEND (k_tail, t_req) TO tail
BECOME join_beh(cust, k_head, k_tail)
]
**/
static
BEH_DECL(fork_beh)
{
CONS* state = MINE;
CONS* cust;
CONS* head;
CONS* tail;
CONS* msg = WHAT;
CONS* h_req;
CONS* t_req;
CONS* k_head;
CONS* k_tail;
DBUG_ENTER("fork_beh");
assert(is_pr(state));
cust = hd(state);
assert(actorp(cust));
assert(is_pr(tl(state)));
head = hd(tl(state));
assert(actorp(head));
tail = tl(tl(state));
assert(actorp(tail));
assert(is_pr(msg));
h_req = hd(msg);
t_req = tl(msg);
k_head = ACTOR(tag_beh, SELF);
k_tail = ACTOR(tag_beh, SELF);
SEND(head, pr(k_head, h_req));
SEND(tail, pr(k_tail, t_req));
BECOME(join_beh, pr(cust, pr(k_head, k_tail)));
DBUG_RETURN;
}
/**
LET dotted_close_beh(cust) = \ok.[
CASE ok OF
$True : [ SEND (cust, ")") TO current_sink ]
_ : [ SEND ok TO cust ]
END
]
**/
static
BEH_DECL(dotted_close_beh)
{
CONS* cust = MINE;
CONS* ok = WHAT;
DBUG_ENTER("dotted_close_beh");
ENSURE(actorp(cust));
if (ok == a_true) {
SINK* sink = current_sink;
SEND(cust, (sink->put)(sink, NUMBER(')')));
} else {
SEND(cust, ok);
}
DBUG_RETURN;
}
/**
LET dotted_tail_beh(cust, last) = \ok.[
CASE ok OF
$True : [
SEND (k_close, #write) TO last
CREATE k_close WITH dotted_close_beh(cust)
]
_ : [ SEND ok TO cust ]
END
]
**/
static
BEH_DECL(dotted_tail_beh)
{
CONS* state = MINE;
CONS* cust;
CONS* last;
CONS* ok = WHAT;
DBUG_ENTER("dotted_tail_beh");
ENSURE(is_pr(state));
cust = hd(state);
ENSURE(actorp(cust));
last = tl(state);
if (ok == a_true) {
CONS* k_close = ACTOR(dotted_close_beh, cust);
SEND(last, pr(k_close, ATOM("write")));
} else {
SEND(cust, ok);
}
DBUG_RETURN;
}
/**
LET object_type = \(cust, req).[ # base object type
CASE req OF
(#eval, _) : [ SEND SELF TO cust ]
# (#eq, $SELF) : [ SEND True TO cust ]
# (#eq, _) : [ SEND False TO cust ]
#copy_immutable : [ SEND SELF TO cust ]
(#write_tail, " ") : [
SEND (k_tail, " . ") TO current_sink
CREATE k_tail WITH dotted_tail_beh(cust, SELF)
]
_ : THROW (#Not-Understood, SELF, req)
END
]
**/
static
BEH_DECL(object_type)
{
CONS* msg = WHAT;
CONS* cust;
CONS* req;
DBUG_ENTER("object_type");
ENSURE(is_pr(msg));
cust = hd(msg);
ENSURE(actorp(cust));
req = tl(msg);
if (is_pr(req)
&& (hd(req) == ATOM("eval"))) {
SEND(cust, SELF);
/*
} else if (is_pr(req)
&& (hd(req) == ATOM("eq"))) {
SEND(cust, ((tl(req) == SELF) ? a_true : a_false));
*/
} else if (req == ATOM("copy_immutable")) {
SEND(cust, SELF);
} else if (is_pr(req)
&& (hd(req) == ATOM("write_tail"))
&& (tl(req) == NUMBER(' '))) {
SINK* sink = current_sink;
CONS* k_tail = ACTOR(dotted_tail_beh, pr(cust, SELF));
SEND(k_tail, (sink->put_cstr)(sink, " . "));
} else {
THROW(pr(ATOM("Not-Understood"), pr(SELF, req)));
}
DBUG_RETURN;
}
/**
LET unit_type = \(cust, req).[
CASE req OF
(#type_eq, $unit_type) : [ SEND True TO cust ]
(#type_eq, _) : [ SEND False TO cust ]
#write : [ SEND (cust, "#inert") TO current_sink ]
_ : object_type(cust, req)
END
]
**/
static
BEH_DECL(unit_type)
{
CONS* msg = WHAT;
CONS* cust;
CONS* req;
DBUG_ENTER("unit_type");
ENSURE(is_pr(msg));
cust = hd(msg);
ENSURE(actorp(cust));
req = tl(msg);
DBUG_PRINT("cust", ("%s", cons_to_str(cust)));
DBUG_PRINT("req", ("%s", cons_to_str(req)));
if (is_pr(req)
&& (hd(req) == ATOM("type_eq"))) {
SEND(cust, ((tl(req) == MK_REF(unit_type)) ? a_true : a_false));
} else if (req == ATOM("write")) {
SINK* sink = current_sink;
SEND(cust, (sink->put_cstr)(sink, "#inert"));
} else {
object_type(CFG); /* DELEGATE BEHAVIOR */
}
DBUG_RETURN;
}
/**
LET oper_type = \(cust, req).[
CASE req OF
(#type_eq, $oper_type) : [ SEND True TO cust ]
(#type_eq, _) : [ SEND False TO cust ]
#write : [ SEND (cust, "#operative") TO current_sink ]
_ : object_type(cust, req)
END
]
**/
static
BEH_DECL(oper_type)
{
CONS* msg = WHAT;
CONS* cust;
CONS* req;
DBUG_ENTER("oper_type");
ENSURE(is_pr(msg));
cust = hd(msg);
ENSURE(actorp(cust));
req = tl(msg);
DBUG_PRINT("cust", ("%s", cons_to_str(cust)));
DBUG_PRINT("req", ("%s", cons_to_str(req)));
if (is_pr(req)
&& (hd(req) == ATOM("type_eq"))) {
SEND(cust, ((tl(req) == MK_REF(oper_type)) ? a_true : a_false));
} else if (req == ATOM("write")) {
SINK* sink = current_sink;
SEND(cust, (sink->put_cstr)(sink, "#operative"));
} else {
object_type(CFG); /* DELEGATE BEHAVIOR */
}
DBUG_RETURN;
}
#if OPT_AS_TUPLE
/**
LET as_tuple(list) = (
CASE list OF
(h, t) : cons(h, as_tuple(t))
_ : NIL
END
)
**/
static CONS*
as_tuple(CONS* list)
{
DBUG_ENTER("as_tuple");
DBUG_PRINT("list", ("%s", cons_to_str(list)));
list = cons_value(list);
if (is_pr(list)) {
CONS* rest = as_tuple(tl(list));
if (rest == BOOLEAN(FALSE)) {
list = rest; /* propagate failure */
} else {
list = pr(hd(list), rest);
}
}
DBUG_PRINT("result", ("%s", cons_to_str(list)));
DBUG_RETURN list;
}
#endif
/**
LET args_oper(args_beh) = \(cust, req).[
CASE req OF
(#comb, opnds, env) : [
CREATE k_args WITH args_beh(cust, env)
# SEND (k_args, #as_tuple) TO opnds
SEND as_tuple(opnds) TO k_args
]
_ : oper_type(cust, req)
END
]
**/
static
BEH_DECL(args_oper)
{
CONS* args_beh = MINE;
CONS* msg = WHAT;
CONS* cust;
CONS* req;
DBUG_ENTER("args_oper");
ENSURE(funcp(args_beh));
ENSURE(is_pr(msg));
cust = hd(msg);
ENSURE(actorp(cust));
req = tl(msg);
DBUG_PRINT("cust", ("%s", cons_to_str(cust)));
DBUG_PRINT("req", ("%s", cons_to_str(req)));
if (is_pr(req) && is_pr(tl(req))
&& (hd(req) == ATOM("comb"))) {
CONS* opnds = hd(tl(req));
CONS* env = tl(tl(req));
CONS* k_args;
k_args = ACTOR((MK_BEH(args_beh)), pr(cust, env));
#if OPT_AS_TUPLE
SEND(k_args, as_tuple(opnds));
#else
SEND(opnds, pr(k_args, ATOM("as_tuple")));
#endif
} else {
oper_type(CFG); /* DELEGATE BEHAVIOR */
}
DBUG_RETURN;
}
/**
LET appl_args_beh(cust, comb, env) = \args.[
# CREATE expr WITH pair_type(comb, args)
# SEND (cust, #eval, env) TO expr
SEND (cust, #comb, args, env) TO comb # inline Pair combination
]
**/
static
BEH_DECL(appl_args_beh)
{
CONS* state = MINE;
CONS* cust;
CONS* comb;
CONS* env;
CONS* args = WHAT;
#if !OPT_INLINE_COMB
CONS* expr;
#endif
DBUG_ENTER("appl_args_beh");
ENSURE(is_pr(state));
cust = hd(state);
ENSURE(actorp(cust));
ENSURE(is_pr(tl(state)));
comb = hd(tl(state));
env = tl(tl(state));
DBUG_PRINT("cust", ("%s", cons_to_str(cust)));
DBUG_PRINT("comb", ("%s", cons_to_str(comb)));
DBUG_PRINT("env", ("%s", cons_to_str(env)));
DBUG_PRINT("args", ("%s", cons_to_str(args)));
#if OPT_INLINE_COMB
SEND(comb, pr(cust, pr(ATOM("comb"), pr(args, env))));
#else
expr = ACTOR(pair_type, pr(comb, args));
SEND(expr, pr(cust, pr(ATOM("eval"), env)));
#endif
DBUG_RETURN;
}
/**
LET appl_type(comb) = \(cust, req).[
CASE req OF
(#type_eq, $appl_type) : [ SEND True TO cust ]
(#type_eq, _) : [ SEND False TO cust ]
(#comb, opnds, env) : [
SEND (k_args, #map, #eval, env) TO opnds
CREATE k_args WITH \args.[ # appl_args_beh
SEND (cust, #comb, args, env) TO comb # inline Pair combination
]
]
#unwrap : [ SEND comb TO cust ]
#write : [ SEND (cust, "#applicative") TO current_sink ]
_ : object_type(cust, req)
END
]
**/
static
BEH_DECL(appl_type)
{
CONS* comb = MINE;
CONS* msg = WHAT;
CONS* cust;
CONS* req;
DBUG_ENTER("appl_type");
ENSURE(actorp(comb));
ENSURE(is_pr(msg));
cust = hd(msg);
ENSURE(actorp(cust));
req = tl(msg);
DBUG_PRINT("cust", ("%s", cons_to_str(cust)));
DBUG_PRINT("req", ("%s", cons_to_str(req)));
DBUG_PRINT("comb", ("%s", cons_to_str(comb)));
if (is_pr(req)
&& (hd(req) == ATOM("type_eq"))) {
SEND(cust, ((tl(req) == MK_REF(appl_type)) ? a_true : a_false));
} else if (is_pr(req) && is_pr(tl(req))
&& (hd(req) == ATOM("comb"))) {
CONS* opnds = hd(tl(req));
CONS* env = tl(tl(req));
CONS* k_args = ACTOR(appl_args_beh, pr(cust, pr(comb, env)));
DBUG_PRINT("opnds", ("%s", cons_to_str(opnds)));
DBUG_PRINT("env", ("%s", cons_to_str(env)));
SEND(opnds, pr(k_args, pr(ATOM("map"), pr(ATOM("eval"), env))));
} else if (req == ATOM("unwrap")) {
SEND(cust, comb);
} else if (req == ATOM("write")) {
SINK* sink = current_sink;
SEND(cust, (sink->put_cstr)(sink, "#applicative"));
} else {
object_type(CFG); /* DELEGATE BEHAVIOR */
}
DBUG_RETURN;
}
#if OPT_APPL_UNWRAP
/* extract combiner from applicative */
static CONS*
appl_unwrap(CONS* appl)
{
CONS* comb = BOOLEAN(FALSE); /* default: failure */
DBUG_ENTER("appl_unwrap");
DBUG_PRINT("appl", ("%s", cons_to_str(appl)));
if (actorp(appl)) {
appl = MK_CONS(appl);
if (hd(appl) == MK_FUNC(appl_type)) {
comb = tl(appl);
}
}
DBUG_PRINT("comb", ("%s", cons_to_str(comb)));
DBUG_RETURN comb;
}
#endif
/**
LET sealed_type(brand, value) = \(cust, req).[
CASE req OF
(#type_eq, $brand) : [ SEND True TO cust ]
(#type_eq, _) : [ SEND False TO cust ]
(#unseal, $brand) : [ SEND value TO cust ]
#write : [ SEND (cust, "#encapsulation") TO current_sink ]
_ : object_type(cust, req)
END
]
**/
static
BEH_DECL(sealed_type)
{
CONS* state = MINE;
CONS* brand;
CONS* value;
CONS* msg = WHAT;
CONS* cust;
CONS* req;
DBUG_ENTER("sealed_type");
ENSURE(is_pr(state));
brand = hd(state);
value = tl(state);
ENSURE(is_pr(msg));
cust = hd(msg);
ENSURE(actorp(cust));
req = tl(msg);
DBUG_PRINT("brand", ("%s", cons_to_str(brand)));
DBUG_PRINT("value", ("%s", cons_to_str(value)));
DBUG_PRINT("cust", ("%s", cons_to_str(cust)));
DBUG_PRINT("req", ("%s", cons_to_str(req)));
if (is_pr(req)
&& (hd(req) == ATOM("type_eq"))) {
SEND(cust, ((tl(req) == brand) ? a_true : a_false));
} else if (is_pr(req)
&& (hd(req) == ATOM("unseal"))
&& (tl(req) == brand)) {
SEND(cust, value);
} else if (req == ATOM("write")) {
SINK* sink = current_sink;
SEND(cust, (sink->put_cstr)(sink, "#encapsulation"));
} else {
object_type(CFG); /* DELEGATE BEHAVIOR */
}
DBUG_RETURN;
}
/**
LET brand_type = \(cust, value).[
CREATE encapsulation WITH sealed_type(SELF, value)
SEND encapsulation TO cust
]
**/
static
BEH_DECL(brand_type)
{
CONS* msg = WHAT;
CONS* cust;
CONS* value;
CONS* sealed;
DBUG_ENTER("brand_type");
ENSURE(is_pr(msg));
cust = hd(msg);
ENSURE(actorp(cust));
value = tl(msg);
DBUG_PRINT("cust", ("%s", cons_to_str(cust)));
DBUG_PRINT("value", ("%s", cons_to_str(value)));
sealed = ACTOR(sealed_type, pr(SELF, value));
SEND(cust, sealed);
DBUG_RETURN;
}
/**
LET const_type(value) = \(cust, req).[
CASE req OF
(#type_eq, $const_type) : [ SEND True TO cust ]
(#type_eq, _) : [ SEND False TO cust ]
#value : [ SEND value TO cust ]
#write : [ SEND (cust, printable(value)) TO current_sink ]
_ : object_type(cust, req)
END
]
**/
static
BEH_DECL(const_type)
{
CONS* value = MINE;
CONS* msg = WHAT;
CONS* cust;
CONS* req;
DBUG_ENTER("const_type");
ENSURE(is_pr(msg));