extern cv_t c_eval(obj_t cont, obj_t values)
{
assert(is_cont4(cont));
obj_t expr = cont4_arg(cont);
EVAL_LOG("expr=%O", expr);
COULD_RETRY();
if (is_self_evaluating(expr))
return cv(cont_cont(cont), CONS(expr, values));
else if (is_symbol(expr)) {
obj_t env = cont_env(cont);
obj_t val = env_lookup(env, expr);
return cv(cont_cont(cont), CONS(val, values));
#if !OLD_ENV
} else if (is_env_ref(expr)) {
return cv(cont_cont(cont),
CONS(env_ref_lookup(cont_env(cont), expr), values));
#endif
} else if (is_application(expr)) {
obj_t operator = application_operator(expr);
obj_t env = cont_env(cont);
obj_t second = make_cont4(c_eval_operator,
cont_cont(cont),
env,
expr);
obj_t first = make_cont4(c_eval, second, env, operator);
return cv(first, values);
}
SYNTAX_ERROR(expr, expr, "must be expression");
}
data_t *eval(const data_t *exp, data_t *env) {
if(eval_plz_die) {
eval_plz_die = 0;
ExitThread(0);
}
if(is_self_evaluating(exp))
return (data_t*)exp;
if(is_variable(exp))
return lookup_variable_value(exp, env);
if(is_quoted_expression(exp))
return get_text_of_quotation(exp);
if(is_assignment(exp))
return eval_assignment(exp, env);
if(is_definition(exp))
return eval_definition(exp, env);
if(is_if(exp))
return eval_if(exp, env);
if(is_lambda(exp))
return make_procedure(get_lambda_parameters(exp), get_lambda_body(exp), env);
if(is_begin(exp))
return eval_sequence(get_begin_actions(exp), env);
if(is_cond(exp))
return eval(cond_to_if(exp), env);
if(is_letrec(exp))
return eval(letrec_to_let(exp), env);
if(is_let_star(exp))
return eval(let_star_to_nested_lets(exp), env);
if(is_let(exp))
return eval(let_to_combination(exp), env);
if(is_application(exp))
return apply(
eval(get_operator(exp), env),
get_list_of_values(get_operands(exp), env));
printf("Unknown expression type -- EVAL '");
return make_symbol("error");
}
void
FileTypeWindow::MessageReceived(BMessage* message)
{
switch (message->what) {
// File Type group
case kMsgTypeEntered:
fCommonType = fTypeControl->Text();
_AdoptType();
break;
case kMsgSelectType:
{
BWindow* window = new TypeListWindow(fCommonType.String(),
kMsgTypeSelected, this);
window->Show();
break;
}
case kMsgTypeSelected:
{
const char* type;
if (message->FindString("type", &type) == B_OK) {
fCommonType = type;
fTypeControl->SetText(type);
_AdoptType();
}
break;
}
case kMsgSameTypeAs:
{
BMessage panel(kMsgOpenFilePanel);
panel.AddString("title", B_TRANSLATE("Select same type as"));
panel.AddInt32("message", kMsgSameTypeAsOpened);
panel.AddMessenger("target", this);
be_app_messenger.SendMessage(&panel);
break;
}
case kMsgSameTypeAsOpened:
_AdoptType(message);
break;
// Preferred Application group
case kMsgPreferredAppChosen:
{
const char* signature;
if (message->FindString("signature", &signature) == B_OK)
fCommonPreferredApp = signature;
else
fCommonPreferredApp = "";
_AdoptPreferredApp();
break;
}
case kMsgSelectPreferredApp:
{
BMessage panel(kMsgOpenFilePanel);
panel.AddString("title",
B_TRANSLATE("Select preferred application"));
panel.AddInt32("message", kMsgPreferredAppOpened);
panel.AddMessenger("target", this);
be_app_messenger.SendMessage(&panel);
break;
}
case kMsgPreferredAppOpened:
_AdoptPreferredApp(message, false);
break;
case kMsgSamePreferredAppAs:
{
BMessage panel(kMsgOpenFilePanel);
panel.AddString("title",
B_TRANSLATE("Select same preferred application as"));
panel.AddInt32("message", kMsgSamePreferredAppAsOpened);
panel.AddMessenger("target", this);
be_app_messenger.SendMessage(&panel);
break;
}
case kMsgSamePreferredAppAsOpened:
_AdoptPreferredApp(message, true);
break;
// Other
case B_SIMPLE_DATA:
{
entry_ref ref;
if (message->FindRef("refs", &ref) != B_OK)
break;
BFile file(&ref, B_READ_ONLY);
if (is_application(file))
_AdoptPreferredApp(message, false);
else
_AdoptType(message);
break;
}
case B_META_MIME_CHANGED:
const char* type;
int32 which;
if (message->FindString("be:type", &type) != B_OK
|| message->FindInt32("be:which", &which) != B_OK)
break;
if (which == B_MIME_TYPE_DELETED
|| which == B_SUPPORTED_TYPES_CHANGED) {
_UpdatePreferredApps();
}
break;
default:
BWindow::MessageReceived(message);
}
}
void
FileTypes::RefsReceived(BMessage *message)
{
bool traverseLinks = (modifiers() & B_SHIFT_KEY) == 0;
// filter out applications and entries we can't open
int32 index = 0;
entry_ref ref;
while (message->FindRef("refs", index++, &ref) == B_OK) {
BEntry entry;
BFile file;
status_t status = entry.SetTo(&ref, traverseLinks);
if (status == B_OK)
status = file.SetTo(&entry, B_READ_ONLY);
if (status != B_OK) {
// file cannot be opened
char buffer[1024];
snprintf(buffer, sizeof(buffer),
B_TRANSLATE("Could not open \"%s\":\n"
"%s"),
ref.name, strerror(status));
(new BAlert(B_TRANSLATE("FileTypes request"),
buffer, B_TRANSLATE("OK"), NULL, NULL,
B_WIDTH_AS_USUAL, B_STOP_ALERT))->Go();
message->RemoveData("refs", --index);
continue;
}
if (!is_application(file) && !is_resource(file)) {
if (entry.GetRef(&ref) == B_OK)
message->ReplaceRef("refs", index - 1, &ref);
continue;
}
// remove application from list
message->RemoveData("refs", --index);
// There are some refs left that want to be handled by the type window
BPoint point(100.0f + kCascadeOffset * fTypeWindowCount,
110.0f + kCascadeOffset * fTypeWindowCount);
BWindow* window = new ApplicationTypeWindow(point, entry);
window->Show();
fTypeWindowCount++;
fWindowCount++;
}
if (message->FindRef("refs", &ref) != B_OK)
return;
// There are some refs left that want to be handled by the type window
BPoint point(100.0f + kCascadeOffset * fTypeWindowCount,
110.0f + kCascadeOffset * fTypeWindowCount);
BWindow* window = new FileTypeWindow(point, *message);
window->Show();
fTypeWindowCount++;
fWindowCount++;
}
object *eval(object *exp, object *env) {
object *procedure;
object *arguments;
object *result;
bool tailcall = false;
do {
if (is_self_evaluating(exp))
return exp;
if (is_variable(exp))
return lookup_variable_value(exp, env);
if (is_quoted(exp))
return text_of_quotation(exp);
if (is_assignment(exp))
return eval_assignment(exp, env);
if (is_definition(exp))
return eval_definition(exp, env);
if (is_if(exp)) {
exp = is_true(eval(if_predicate(exp), env)) ? if_consequent(exp) : if_alternative(exp);
tailcall = true;
continue;
}
if (is_lambda(exp))
return make_compound_proc(lambda_parameters(exp), lambda_body(exp), env);
if (is_begin(exp)) {
exp = begin_actions(exp);
while (!is_last_exp(exp)) {
eval(first_exp(exp), env);
exp = rest_exps(exp);
}
exp = first_exp(exp);
tailcall = true;
continue;
}
if (is_cond(exp)) {
exp = cond_to_if(exp);
tailcall = true;
continue;
}
if (is_let(exp)) {
exp = let_to_application(exp);
tailcall = true;
continue;
}
if (is_and(exp)) {
exp = and_tests(exp);
if (is_empty(exp))
return make_boolean(true);
while (!is_last_exp(exp)) {
result = eval(first_exp(exp), env);
if (is_false(result))
return result;
exp = rest_exps(exp);
}
exp = first_exp(exp);
tailcall = true;
continue;
}
if (is_or(exp)) {
exp = or_tests(exp);
if (is_empty(exp)) {
return make_boolean(false);
}
while (!is_last_exp(exp)) {
result = eval(first_exp(exp), env);
if (is_true(result))
return result;
exp = rest_exps(exp);
}
exp = first_exp(exp);
tailcall = true;
continue;
}
if (is_application(exp)) {
procedure = eval(operator(exp), env);
arguments = list_of_values(operands(exp), env);
if (is_primitive_proc(procedure) && procedure->data.primitive_proc.fn == eval_proc) {
exp = eval_expression(arguments);
env = eval_environment(arguments);
tailcall = true;
continue;
}
if (is_primitive_proc(procedure) && procedure->data.primitive_proc.fn == apply_proc) {
procedure = apply_operator(arguments);
arguments = apply_operands(arguments);
}
if (is_primitive_proc(procedure))
return (procedure->data.primitive_proc.fn)(arguments);
if (is_compound_proc(procedure)) {
env = extend_environment(procedure->data.compound_proc.parameters, arguments, procedure->data.compound_proc.env);
exp = make_begin(procedure->data.compound_proc.body);
tailcall = true;
continue;
}
return make_error(342, "unknown procedure type");
} // is_application()
} while (tailcall);
fprintf(stderr, "cannot eval unknown expression type\n");
exit(EXIT_FAILURE);
}
object *bs_eval(object *exp, object *env)
{
tailcall:
if (is_empty_list(exp)) {
error("unable to evaluate empty list");
} else if (is_self_evaluating(exp)) {
return exp;
} else if (is_variable(exp)) {
return lookup_variable_value(exp, env);
} else if (is_quoted(exp)) {
return quoted_expression(exp);
} else if (is_assignment(exp)) {
return eval_assignment(exp, env);
} else if (is_definition(exp)) {
return eval_definition(exp, env);
} else if (is_if(exp)) {
if (is_true(bs_eval(if_predicate(exp), env))) {
exp = if_consequent(exp);
} else {
exp = if_alternate(exp);
}
goto tailcall;
} else if (is_lambda(exp)) {
return make_compound_proc(lambda_parameters(exp),
lambda_body(exp),
env);
} else if (is_begin(exp)) {
exp = begin_actions(exp);
if (is_empty_list(exp)) {
error("empty begin block");
}
while (!is_empty_list(cdr(exp))) {
bs_eval(car(exp), env);
exp = cdr(exp);
}
exp = car(exp);
goto tailcall;
} else if (is_cond(exp)) {
exp = cond_to_if(exp);
goto tailcall;
} else if (is_let(exp)) {
exp = let_to_application(exp);
goto tailcall;
} else if (is_and(exp)) {
exp = and_tests(exp);
if (is_empty_list(exp)) {
return get_boolean(1);
}
object *result;
while (!is_empty_list(cdr(exp))) {
result = bs_eval(car(exp), env);
if (is_false(result)) {
return result;
}
exp = cdr(exp);
}
exp = car(exp);
goto tailcall;
} else if (is_or(exp)) {
exp = or_tests(exp);
if (is_empty_list(exp)) {
return get_boolean(0);
}
object *result;
while (!is_empty_list(cdr(exp))) {
result = bs_eval(car(exp), env);
if (is_true(result)) {
return result;
}
exp = cdr(exp);
}
exp = car(exp);
goto tailcall;
} else if (is_application(exp)) {
object *procedure = bs_eval(application_operator(exp), env);
object *parameters = eval_parameters(application_operands(exp), env);
// handle eval specially for tailcall requirement.
if (is_primitive_proc(procedure) &&
procedure->value.primitive_proc == eval_proc) {
exp = eval_expression(parameters);
env = eval_environment(parameters);
goto tailcall;
}
// handle apply specially for tailcall requirement.
if (is_primitive_proc(procedure) &&
procedure->value.primitive_proc == apply_proc) {
procedure = apply_operator(parameters);
parameters = apply_operands(parameters);
}
if (is_primitive_proc(procedure)) {
return (procedure->value.primitive_proc)(parameters);
} else if (is_compound_proc(procedure)) {
env = extend_environment(
procedure->value.compound_proc.parameters,
parameters,
procedure->value.compound_proc.env);
exp = make_begin(procedure->value.compound_proc.body);
goto tailcall;
} else {
error("unable to apply unknown procedure type");
}
} else {
error("unable to evaluate expression");
}
}
static pSlipObject slip_eval(pSlip gd, pSlipObject exp, pSlipEnvironment env)
{
pSlipObject proc;
pSlipObject args;
tailcall:
if (is_self_evaluating(exp) == S_TRUE)
{
return exp;
}
else if (is_variable(exp) == S_TRUE)
{
return lookup_variable_value(gd, exp, env);
}
else if (is_quoted(gd, exp) == S_TRUE)
{
return text_of_quotation(exp);
}
else if (is_assignment(gd, exp) == S_TRUE)
{
return eval_assignment(gd, exp, env);
}
else if (is_definition(gd, exp) == S_TRUE)
{
return eval_definition(gd, exp, env);
}
else if (is_if(gd, exp) == S_TRUE)
{
exp = is_true(gd, slip_eval(gd, if_predicate(exp), env)) == S_TRUE ? if_consequent(exp) : if_alternative(gd, exp);
goto tailcall;
}
else if (is_lambda(gd, exp) == S_TRUE)
{
return s_NewCompoundProc(gd, lambda_parameters(exp), lambda_body(exp), env);
}
else if (is_begin(gd, exp) == S_TRUE)
{
exp = begin_actions(exp);
while (!is_last_exp(gd, exp))
{
slip_eval(gd, first_exp(exp), env);
exp = rest_exps(exp);
}
exp = first_exp(exp);
goto tailcall;
}
else if (is_cond(gd, exp) == S_TRUE)
{
exp = cond_to_if(gd, exp);
goto tailcall;
}
else if (is_let(gd, exp) == S_TRUE)
{
exp = let_to_application(gd, exp);
goto tailcall;
}
else if (is_application(exp) == S_TRUE)
{
proc = slip_eval(gd, slip_operator(exp), env);
if (proc == NULL)
return gd->singleton_False;
if (proc->type == eType_PRIMITIVE_PROC || proc->type == eType_COMPOUND_PROC)
{
args = list_of_values(gd, operands(exp), env);
if (args == NULL)
return gd->singleton_False;
if (sIsObject_PrimitiveProc(proc) == S_TRUE)
{
return proc->data.prim_proc.func(gd, args);
}
else if (sIsObject_CompoundProc(proc) == S_TRUE)
{
env = setup_environment(gd, proc->data.comp_proc.env, proc->data.comp_proc.params, args);
exp = make_begin(gd, proc->data.comp_proc.code);
goto tailcall;
}
else
{
throw_error(gd, "unknown procedure type\n");
return gd->singleton_False;
}
}
else
return proc;
}
else
{
throw_error(gd, "cannot eval unknown expression type\n");
return NULL;
}
throw_error(gd, "what??\n");
return NULL;
}
///////////////////////////////////////////////////////////////////
//eval
//requires two arguments:exp & tail_context
///////////////////////////////////////////////////////////////////
cellpoint eval(void)
{
if (is_true(is_self_evaluating(args_ref(1)))){
reg = args_ref(1);
}else if (is_true(is_variable(args_ref(1)))){
reg = args_ref(1);
args_push(current_env);
args_push(reg);
reg = lookup_var_val();
}else if (is_true(is_quoted(args_ref(1)))){
args_push(args_ref(1));
reg = quotation_text();
}else if (is_true(is_assignment(args_ref(1)))){
args_push(args_ref(1));
reg = eval_assignment();
}else if (is_true(is_definition(args_ref(1)))){
args_push(args_ref(1));
reg = eval_definition();
}else if (is_true(is_if(args_ref(1)))){
//eval if expression with the second argument (tail_context)
reg = args_ref(1);
args_push(args_ref(2));
args_push(reg);
reg = eval_if();
}else if (is_true(is_lambda(args_ref(1)))){
args_push(args_ref(1));
reg = eval_lambda();
}else if (is_true(is_begin(args_ref(1)))){
args_push(args_ref(1));
reg = begin_actions();
//eval the actions of begin exp with the second argument (tail_context)
args_push(args_ref(2));
args_push(reg);
reg = eval_sequence();
}else if (is_true(is_cond(args_ref(1)))){
args_push(args_ref(1));
reg = cond_2_if();
//eval the exp with the second argument (tail_context)
args_push(args_ref(2));
args_push(reg);
reg = eval();
}else if (is_true(is_and(args_ref(1)))){
reg = args_ref(1);
args_push(args_ref(2));
args_push(reg);
reg = eval_and();
}else if (is_true(is_or(args_ref(1)))){
reg = args_ref(1);
args_push(args_ref(2));
args_push(reg);
reg = eval_or();
}else if (is_true(is_let(args_ref(1)))){
//convert let to combination
args_push(args_ref(1));
reg = let_2_combination();
//evals the combination
args_push(args_ref(2));
args_push(reg);
reg = eval();
}else if (is_true(is_letstar(args_ref(1)))){
//convert let* to nested lets
args_push(args_ref(1));
reg = letstar_2_nested_lets();
//evals the nested lets
args_push(args_ref(2));
args_push(reg);
reg = eval();
}else if (is_true(is_application(args_ref(1)))){
//computes operator
args_push(args_ref(1));
reg = operator();
args_push(a_false);
args_push(reg);
reg = eval();
stack_push(&vars_stack, reg);
//computes operands
args_push(args_ref(1));
reg = operands();
args_push(reg);
reg = list_of_values();
//calls apply with the second argument (tail_context)
args_push(args_ref(2));
args_push(reg);
args_push(stack_pop(&vars_stack));
reg = apply();
}else {
printf("Unknown expression type -- EVAL\n");
error_handler();
}
args_pop(2);
return reg;
}
