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syntax.c
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/*
* ISLisp standard syntax functions
*/
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <setjmp.h>
#include <math.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include "eisl.h"
#include "compat/nana_stubs.h"
#include "fmt.h"
#include "str.h"
#include "mem.h"
#define TAGBODY_LEN_MAX 100
#define DBG_PRINTF(msg,arg) if(gbc_flag) printf(msg,arg)
void init_syntax(void)
{
def_fsubr("LAMBDA", f_lambda);
def_fsubr("LABELS", f_labels);
def_fsubr("FLET", f_flet);
def_fsubr("LET", f_let);
def_fsubr("LET*", f_letstar);
def_fsubr("SETQ", f_setq);
def_fsubr("SETF", f_setf);
def_fsubr("SET-DYNAMIC", f_set_dynamic);
def_fsubr("DEFCONSTANT", f_defconstant);
def_fsubr("DEFUN", f_defun);
def_fsubr("DEFMACRO", f_defmacro);
def_fsubr("DEFGLOBAL", f_defglobal);
def_fsubr("DEFDYNAMIC", f_defdynamic);
def_fsubr("DYNAMIC", f_dynamic);
def_fsubr("FUNCTION", f_function);
def_fsubr("FUNCTION*", f_function_star);
def_fsubr("SYMBOL-FUNCTION", f_symbol_function);
def_fsubr("CLASS", f_class);
def_fsubr("SYMBOL-CLASS", f_symbol_class);
def_fsubr("AND", f_and);
def_fsubr("OR", f_or);
def_fsubr("IF", f_if);
def_fsubr("COND", f_cond);
def_fsubr("WHILE", f_while);
def_fsubr("FOR", f_for);
def_fsubr("BLOCK", f_block);
def_fsubr("RETURN-FROM", f_return_from);
def_fsubr("CASE", f_case);
def_fsubr("CASE-USING", f_case_using);
def_fsubr("CONVERT", f_convert);
def_fsubr("PROGN", f_progn);
def_fsubr("DEFCLASS", f_defclass);
def_fsubr("DEFGENERIC", f_defgeneric);
def_fsubr("DEFGENERIC*", f_defgeneric_star);
def_fsubr("DEFMETHOD", f_defmethod);
def_fsubr("DYNAMIC-LET", f_dynamic_let);
def_fsubr("IGNORE-ERRORS", f_ignore_errors);
def_fsubr("IMPORT", f_import);
def_fsubr("CATCH", f_catch);
def_fsubr("THROW", f_throw);
def_fsubr("TAGBODY", f_tagbody);
def_fsubr("GO", f_go);
def_fsubr("UNWIND-PROTECT", f_unwind_protect);
def_fsubr("WITH-STANDARD-INPUT", f_with_standard_input);
def_fsubr("WITH-STANDARD-OUTPUT", f_with_standard_output);
def_fsubr("WITH-ERROR-OUTPUT", f_with_error_output);
def_fsubr("WITH-HANDLER", f_with_handler);
def_fsubr("WITH-OPEN-INPUT-FILE", f_with_open_input_file);
def_fsubr("WITH-OPEN-OUTPUT-FILE", f_with_open_output_file);
def_fsubr("WITH-OPEN-IO-FILE", f_with_open_io_file);
def_fsubr("THE", f_the);
def_fsubr("ASSURE", f_assure);
}
// --FSUBR-----------
int f_lambda(int arglist, int th)
{
if (nullp(arglist))
error(NOT_EXIST_ARG, "lambda", NIL, th);
if (duplicate_list_p(car(arglist)))
error(IMPROPER_ARGS, "lambda", car(arglist), th);
if (improper_list_p(car(arglist)))
error(IMPROPER_ARGS, "lambda", car(arglist), th);
if (illegal_lambda_p(car(arglist)))
error(ILLEGAL_ARGS, "lambda", car(arglist), th);
if (!symbol_list_p(car(arglist)))
error(OUT_OF_DOMAIN, "lambda", car(arglist), th);
return (make_func("", arglist));
}
int f_labels(int arglist, int th)
{
int arg1, arg2, save, func, res, temp;
arg1 = car(arglist);
arg2 = cdr(arglist);
if (improper_list_p(arglist))
error(IMPROPER_ARGS, "labels", arglist, th);
if (nullp(arglist))
error(NOT_EXIST_ARG, "labels", NIL, th);
if (!listp(arg1))
error(IMPROPER_ARGS, "labels", arg1, th);
temp = arg1;
while (!nullp(temp)) {
int temparg1, temparg2;
temparg1 = car(car(temp));
temparg2 = cdr(car(temp));
if (length(car(temp)) < 2)
error(IMPROPER_ARGS, "labels", car(temp), th);
if (!symbolp(temparg1))
error(NOT_SYM, "labels", temparg1, th);
if (STRING_REF(temparg1, 0) == ':'
|| STRING_REF(temparg1, 0) == '&')
error(WRONG_ARGS, "labels", temparg1, th);
if (duplicate_list_p(car(temparg2)))
error(IMPROPER_ARGS, "labels", car(temparg2), th);
if (improper_list_p(car(temparg2)))
error(IMPROPER_ARGS, "labels", car(temparg2), th);
if (illegal_lambda_p(car(temparg2)))
error(ILLEGAL_ARGS, "labels", car(temparg2), th);
if (!symbol_list_p(car(temparg2)))
error(OUT_OF_DOMAIN, "labels", car(temparg2), th);
temp = cdr(temp);
}
save = ep[th];
func = NIL;
res = NIL;
while (arg1 != NIL) {
int sym, val;
sym = caar(arg1);
if (!symbolp(sym))
error(NOT_SYM, "labels", sym, th);
add_lex_env(sym, NIL, th);
val = make_func("", cdar(arg1));
set_lex_env(sym, val, th);
func = cons(val, func);
arg1 = cdr(arg1);
}
while (func != NIL) {
SET_CDR(car(func), ep[th]);
func = cdr(func);
}
while (arg2 != NIL) {
res = eval(car(arg2), th);
arg2 = cdr(arg2);
}
ep[th] = save;
return (res);
}
int f_flet(int arglist, int th)
{
int arg1, arg2, save, ep1, res, temp;
arg1 = car(arglist);
arg2 = cdr(arglist);
if (improper_list_p(arglist))
error(IMPROPER_ARGS, "flet", arglist, th);
if (nullp(arglist))
error(NOT_EXIST_ARG, "flet", NIL, th);
if (!listp(arg1))
error(IMPROPER_ARGS, "flet", arg1, th);
temp = arg1;
while (!nullp(temp)) {
int temparg1, temparg2;
temparg1 = car(car(temp));
temparg2 = cdr(car(temp));
if (length(car(temp)) < 2)
error(IMPROPER_ARGS, "flet", car(temp), th);
if (!symbolp(temparg1))
error(NOT_SYM, "flet", temparg1, th);
if (STRING_REF(temparg1, 0) == ':'
|| STRING_REF(temparg1, 0) == '&')
error(WRONG_ARGS, "flet", temparg1, th);
if (duplicate_list_p(car(temparg2)))
error(IMPROPER_ARGS, "flet", car(temparg2), th);
if (improper_list_p(car(temparg2)))
error(IMPROPER_ARGS, "flet", car(temparg2), th);
if (illegal_lambda_p(car(temparg2)))
error(ILLEGAL_ARGS, "flet", car(temparg2), th);
if (!symbol_list_p(car(temparg2)))
error(OUT_OF_DOMAIN, "flet", car(temparg2), th);
temp = cdr(temp);
}
save = ep[th];
ep1 = ep[th];
res = NIL;
while (arg1 != NIL) {
int sym, val;
sym = caar(arg1);
if (!symbolp(sym))
error(NOT_SYM, "flet", sym, th);
ep[th] = save;
val = make_func("", cdar(arg1));
ep[th] = ep1;
add_lex_env(sym, val, th);
ep1 = ep[th];
arg1 = cdr(arg1);
}
while (arg2 != NIL) {
res = eval(car(arg2), th);
arg2 = cdr(arg2);
}
ep[th] = save;
return (res);
}
int f_let(int arglist, int th)
{
int arg1, arg2, save, res, temp;
arg1 = car(arglist);
arg2 = cdr(arglist);
if (length(arglist) == 0)
error(WRONG_ARGS, "let", arglist, th);
if (!listp(arg1))
error(IMPROPER_ARGS, "let", arg1, th);
temp = arg1;
while (!nullp(temp)) {
int temparg1;
temparg1 = car(car(temp));
if (improper_list_p(car(temp)))
error(IMPROPER_ARGS, "let", car(temp), th);
if (length(car(temp)) != 2)
error(IMPROPER_ARGS, "let", car(temp), th);
if (!symbolp(temparg1))
error(NOT_SYM, "let", temparg1, th);
if (temparg1 == T || temparg1 == NIL
|| temparg1 == make_sym("*PI*")
|| temparg1 == make_sym("*MOST-POSITIVE-FLOAT*")
|| temparg1 == make_sym("*MOST-NEGATIVE-FLOAT*"))
error(WRONG_ARGS, "let", arg1, th);
if (STRING_REF(temparg1, 0) == ':'
|| STRING_REF(temparg1, 0) == '&')
error(WRONG_ARGS, "let", arg1, th);
temp = cdr(temp);
}
save = ep[th];
res = NIL;
while (arg1 != NIL) {
int ep1, sym, val;
ep1 = ep[th];
ep[th] = save;
sym = caar(arg1);
if (!symbolp(sym))
error(NOT_SYM, "let", sym, th);
shelter_push(ep1, th);
val = eval(cadar(arg1), th);
shelter_pop(th);
ep[th] = ep1;
add_lex_env(sym, val, th);
arg1 = cdr(arg1);
}
while (arg2 != NIL) {
shelter_push(arg2, th);
res = eval(car(arg2), th);
shelter_pop(th);
arg2 = cdr(arg2);
}
ep[th] = save;
return (res);
}
int f_letstar(int arglist, int th)
{
int arg1, arg2, save, res, temp;
arg1 = car(arglist);
arg2 = cdr(arglist);
if (length(arglist) == 0)
error(WRONG_ARGS, "let*", arglist, th);
if (!listp(arg1))
error(IMPROPER_ARGS, "let*", arg1, th);
temp = arg1;
while (!nullp(temp)) {
int temparg1;
temparg1 = car(car(temp));
if (improper_list_p(car(temp)))
error(IMPROPER_ARGS, "let*", car(temp), th);
if (length(car(temp)) != 2)
error(IMPROPER_ARGS, "let*", car(temp), th);
if (!symbolp(temparg1))
error(NOT_SYM, "let*", temparg1, th);
if (temparg1 == T || temparg1 == NIL
|| temparg1 == make_sym("*PI*")
|| temparg1 == make_sym("*MOST-POSITIVE-FLOAT*")
|| temparg1 == make_sym("*MOST-NEGATIVE-FLOAT*"))
error(WRONG_ARGS, "let*", arg1, th);
if (STRING_REF(temparg1, 0) == ':'
|| STRING_REF(temparg1, 0) == '&')
error(WRONG_ARGS, "let*", arg1, th);
temp = cdr(temp);
}
save = ep[th];
res = NIL;
while (arg1 != NIL) {
int sym;
sym = caar(arg1);
if (!symbolp(sym))
error(NOT_SYM, "let*", sym, th);
add_lex_env(sym, eval(cadar(arg1), th), th);
arg1 = cdr(arg1);
}
while (arg2 != NIL) {
res = eval(car(arg2), th);
arg2 = cdr(arg2);
}
ep[th] = save;
return (res);
}
int f_dynamic_let(int arglist, int th)
{
int arg1, arg2, save, res, temp;
arg1 = car(arglist);
arg2 = cdr(arglist);
if (length(arglist) == 0)
error(WRONG_ARGS, "dynamic-let", arglist, th);
if (!listp(arg1))
error(IMPROPER_ARGS, "dynamic-let", arg1, th);
temp = arg1;
while (!nullp(temp)) {
int temparg1;
temparg1 = car(car(temp));
if (improper_list_p(car(temp)))
error(IMPROPER_ARGS, "dynamic-let", car(temp), th);
if (length(car(temp)) != 2)
error(IMPROPER_ARGS, "dynamic-let", car(temp), th);
if (!symbolp(temparg1))
error(NOT_SYM, "dynamic-let", temparg1, th);
if (temparg1 == T || temparg1 == NIL
|| temparg1 == make_sym("*PI*")
|| temparg1 == make_sym("*MOST-POSITIVE-FLOAT*")
|| temparg1 == make_sym("*MOST-NEGATIVE-FLOAT*"))
error(WRONG_ARGS, "dynamic-let", arg1, th);
if (STRING_REF(temparg1, 0) == ':'
|| STRING_REF(temparg1, 0) == '&')
error(WRONG_ARGS, "dynamic-let", arg1, th);
temp = cdr(temp);
}
save = dp[0];
res = NIL;
while (arg1 != NIL) {
int dp1, sym, val;
dp1 = dp[0];
dp[0] = save;
shelter_push(dp1, th);
sym = caar(arg1);
if (!symbolp(sym))
error(NOT_SYM, "dynamic-let", sym, th);
val = eval(cadar(arg1), th);
dp[0] = dp1;
shelter_pop(th);
add_dyn_env(sym, val, th);
arg1 = cdr(arg1);
}
while (arg2 != NIL) {
res = eval(car(arg2), th);
arg2 = cdr(arg2);
}
dp[0] = save;
return (res);
}
int f_setf(int arglist, int th)
{
int arg1, arg2, newform, var = 0, res;
arg1 = car(arglist);
arg2 = cadr(arglist);
newform = NIL;
if (length(arglist) != 2)
error(WRONG_ARGS, "setf", arglist, th);
if (arg1 == T || arg1 == NIL)
error(CANT_MODIFY, "setf", arg1, th);
if (listp(arg1)
&& eqlp(make_int(1),
cdr(assoc(make_sym("read"), GET_AUX(car(arg1))))))
error(CANT_MODIFY, "setf", arg1, th);
if (improper_list_p(arglist))
error(IMPROPER_ARGS, "setf", arglist, th);
if (listp(arg1) && eqp(car(arg1), make_sym("AREF"))) {
newform = cons(make_sym("SET-AREF"), cons(arg2, cdr(arg1)));
} else if (listp(arg1) && eqp(car(arg1), make_sym("GAREF"))) {
newform = cons(make_sym("SET-GAREF"), cons(arg2, cdr(arg1)));
} else if (listp(arg1) && eqp(car(arg1), make_sym("ELT"))) {
newform = cons(make_sym("SET-ELT"), cons(arg2, cdr(arg1)));
} else if (listp(arg1) && eqp(car(arg1), make_sym("PROPERTY"))) {
newform = cons(make_sym("SET-PROPERTY"), cons(arg2, cdr(arg1)));
} else if (listp(arg1) && eqp(car(arg1), make_sym("CAR"))) {
newform = cons(make_sym("SET-CAR"), cons(arg2, cdr(arg1)));
} else if (listp(arg1) && eqp(car(arg1), make_sym("CDR"))) {
newform = cons(make_sym("SET-CDR"), cons(arg2, cdr(arg1)));
} else if (listp(arg1) && eqp(car(arg1), make_sym("DYNAMIC"))) {
if (improper_list_p(arg1))
error(IMPROPER_ARGS, "dynamic", arg1, th);
if (length(arg1) != 2)
error(IMPROPER_ARGS, "dynamic", arg1, th);
newform = cons(make_sym("SET-DYNAMIC"), list2(arg2, cadr(arg1)));
} else if (listp(arg1) && macrop(car(arg1))) {
var = f_macroexpand_1(list1(arg1), th);
return (f_setf(list2(var, arg2), th));
} else if (symbolp(arg1)) {
newform = cons(make_sym("SETQ"), list2(arg1, arg2));
}
/* e.g. when (setf (foo 1 2) 3) foo was define with (defgeneric (setf foo) (x y z))
* foo is setf related generic function. (defgeneric (set foo) (a b c))
*/
else if (listp(arg1) && member(car(arg1), setf_list)) {
/* e.g. above case (foo 3 1 2) */
newform = cons(car(arg1), cons(arg2, cdr(arg1)));
}
/* (setf (slot-value instance slot-name) value) */
else if (listp(arg1) && eqp(car(arg1), make_sym("SLOT-VALUE"))) {
newform = cons(make_sym("SET-SLOT-VALUE"), cons(arg2, cdr(arg1)));
}
/* e.g. (setf (access-foo-a x) 100) */
else if (listp(arg1) && length(arg1) == 2 && slot_accesor_p(car(arg1))) {
/* a method returns it's variable name */
var = eval(list2(car(arg1), NIL), th);
newform =
cons(make_sym("SET-SLOT-VALUE"),
cons(arg2,
list2(cadr(arg1), list2(make_sym("QUOTE"), var))));
} else
error(IMPROPER_ARGS, "setf", arglist, th);
shelter_push(newform, th);
res = eval(newform, th);
shelter_pop(th);
return (res);
}
int f_set_dynamic(int arglist, int th)
{
int arg1, arg2;
arg1 = eval(car(arglist), th); // val
arg2 = cadr(arglist); // var
if (nullp(arglist))
error(IMPROPER_ARGS, "set-dynamic", arglist, th);
if (improper_list_p(arglist))
error(IMPROPER_ARGS, "set-dynamic", arglist, th);
if (length(arglist) != 2)
error(WRONG_ARGS, "set-dynamic", arglist, th);
if (!symbolp(arg2))
error(NOT_SYM, "set-dynamic", arg2, th);
if (STRING_REF(arg2, 0) == ':' || STRING_REF(arg2, 0) == '&')
error(WRONG_ARGS, "set-dynamic", arg2, th);
if (find_dyn(arg2, th) != FAILSE) {
set_dyn_env(arg2, arg1, th);
return (arg1);
} else
error(UNDEF_VAR, "set-dynamic", arg1, th);
return (arg2);
}
int f_setq(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (length(arglist) != 2)
error(WRONG_ARGS, "setq", arglist, th);
if (!symbolp(arg1))
error(NOT_SYM, "setq", arg1, th);
if (GET_OPT(arg1) == CONSTN)
error(CANT_MODIFY, "setq", arg1, th);
if (improper_list_p(arglist))
error(IMPROPER_ARGS, "setq", arglist, th);
arg2 = eval(arg2, th);
if (find_env(arg1, th) != FAILSE)
set_lex_env(arg1, arg2, th);
else if (GET_OPT(arg1) == GLOBAL)
SET_CDR(arg1, arg2);
else
error(UNDEF_VAR, "setq", arg1, th);
return (arg2);
}
int f_defconstant(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (improper_list_p(arglist))
error(IMPROPER_ARGS, "defconstant", arglist, th);
if (length(arglist) != 2)
error(WRONG_ARGS, "defconstant", arglist, th);
if (!symbolp(arg1))
error(NOT_SYM, "defconstant", arg1, th);
if (arg1 == T || arg1 == NIL || arg1 == make_sym("*PI*") ||
arg1 == make_sym("*MOST-POSITIVE-FLOAT*")
|| arg1 == make_sym("*MOST-NEGATIVE-FLOAT*"))
error(WRONG_ARGS, "defconstant", arg1, th);
if (STRING_REF(arg1, 0) == ':' || STRING_REF(arg1, 0) == '&')
error(WRONG_ARGS, "defconstant", arg1, th);
if (!top_flag && !ignore_topchk)
error(NOT_TOP_LEVEL, "defconstant", arglist, th);
SET_CDR(arg1, eval(arg2, 0));
SET_OPT(arg1, CONSTN); /* constant */
return (arg1);
}
int f_defun(int arglist, int th)
{
int arg1, arg2, val;
arg1 = car(arglist);
arg2 = cdr(arglist);
if (length(arglist) < 2)
error(WRONG_ARGS, "defun", arglist, th);
if (!symbolp(arg1))
error(NOT_SYM, "defun", arg1, th);
if (IS_SUBR(GET_CAR(arg1)))
error(CANT_MODIFY, "defun", arg1, th);
if (IS_FSUBR(GET_CAR(arg1)))
error(CANT_MODIFY, "defun", arg1, th);
if (STRING_REF(arg1, 0) == ':' || STRING_REF(arg1, 0) == '&')
error(WRONG_ARGS, "defun", arg1, th);
if (duplicate_list_p(car(arg2)))
error(IMPROPER_ARGS, "defun", car(arg2), th);
if (improper_list_p(car(arg2)))
error(IMPROPER_ARGS, "defun", car(arg2), th);
if (illegal_lambda_p(car(arg2)))
error(ILLEGAL_ARGS, "defun", car(arg2), th);
if (!symbol_list_p(car(arg2)))
error(OUT_OF_DOMAIN, "defun", car(arg2), th);
val = make_func(GET_NAME(arg1), arg2);
SET_CAR(arg1, val);
return (arg1);
}
int f_defmacro(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cdr(arglist);
if (length(arglist) < 2)
error(WRONG_ARGS, "defmacro", arglist, th);
if (!symbolp(arg1))
error(NOT_SYM, "defmacro", arg1, th);
if (GET_OPT(arg1) == CONSTN)
error(CANT_MODIFY, "defmacro", arg1, th);
if (IS_SUBR(GET_CAR(arg1)))
error(CANT_MODIFY, "defmacro", arg1, th);
if (IS_FSUBR(GET_CAR(arg1)))
error(CANT_MODIFY, "defmacro", arg1, th);
if (improper_list_p(arg2)) {
error(IMPROPER_ARGS, "defmacro", arg2, th);
}
if (duplicate_list_p(car(arg2)))
error(IMPROPER_ARGS, "defmacro", car(arg2), th);
if (improper_list_p(car(arg2))) {
error(IMPROPER_ARGS, "defmacro", car(arg2), th);
}
if (illegal_lambda_p(car(arg2))) {
error(ILLEGAL_ARGS, "defmacro", car(arg2), th);
}
if (!symbol_list_p(car(arg2))) {
error(OUT_OF_DOMAIN, "defmacro", car(arg2), th);
}
if (!top_flag && !ignore_topchk)
error(NOT_TOP_LEVEL, "defmacro", arglist, th);
bind_macro(GET_NAME(arg1), arg2);
return (arg1);
}
int f_defglobal(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (improper_list_p(arglist))
error(IMPROPER_ARGS, "defglobal", arglist, th);
if (length(arglist) != 2)
error(WRONG_ARGS, "defglobal", arglist, th);
if (!symbolp(arg1))
error(NOT_SYM, "defglobal", arg1, th);
if (GET_OPT(arg1) == CONSTN)
error(CANT_MODIFY, "defglobal", arg1, th);
if (STRING_REF(arg1, 0) == ':' || STRING_REF(arg1, 0) == '&')
error(ILLEGAL_ARGS, "defglobal", arg1, th);
arg2 = big_to_parmanent(eval(arg2, 0));
SET_CDR(arg1, arg2);
SET_OPT(arg1, GLOBAL);
return (arg1);
}
int f_defdynamic(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
if (improper_list_p(cdr(arglist)))
error(IMPROPER_ARGS, "defdynamic", arglist, th);
if (length(arglist) != 2)
error(WRONG_ARGS, "defdynamic", arglist, th);
if (!symbolp(arg1))
error(NOT_SYM, "defdynamic", arg1, th);
if (STRING_REF(arg1, 0) == ':' || STRING_REF(arg1, 0) == '&')
error(WRONG_ARGS, "defdynamic", arg1, th);
set_dyn_env(arg1, eval(arg2, th), th);
return (arg1);
}
int f_dynamic(int arglist, int th)
{
int arg1, res;
arg1 = car(arglist);
if (improper_list_p(arglist))
error(IMPROPER_ARGS, "dynamic", arglist, th);
if (length(arglist) != 1)
error(WRONG_ARGS, "dynamic", arglist, th);
if (!symbolp(arg1))
error(NOT_SYM, "dynamic", arg1, th);
res = find_dyn(arg1, th);
if (res == FAILSE)
error(UNDEF_DYN, "dynamic", arg1, th);
return (res);
}
int f_and(int arglist, int th)
{
if (nullp(arglist))
return (T);
else if (nullp(cdr(arglist)))
return (eval(car(arglist), th));
else if (eval(car(arglist), th) != NIL)
return (f_and(cdr(arglist), th));
else
return (NIL);
}
int f_or(int arglist, int th)
{
int temp;
if (nullp(arglist))
return (NIL);
else if (nullp(cdr(arglist)))
return (eval(car(arglist), th));
else if ((temp = eval(car(arglist), th)) == NIL)
return (f_or(cdr(arglist), th));
else
return (temp);
return (UNDEF);
}
int f_function(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "function", arglist, th);
if (improper_list_p(arglist))
error(ILLEGAL_FORM, "function", arglist, th);
if (symbolp(arg1)) {
int res;
res = find_env(arg1, th);
if (IS_FUNC(res))
return (res);
else if (IS_FSUBR(GET_CAR(arg1)))
error(UNDEF_FUN, "function", arg1, th);
else if (macrop(arg1))
error(UNDEF_FUN, "function", arg1, th);
else if (GET_CAR(arg1) != NIL)
return (GET_CAR(arg1));
else
error(UNDEF_FUN, "function", arg1, th);
} else if (listp(arg1) && eqp(car(arg1), make_sym("lambda")))
return (eval(arg1, th));
else
error(NOT_FUNC, "function", arg1, th);
return (UNDEF);
}
/*
* function* diffrence of function is that return nil
* defclass uses this function*
*/
int f_function_star(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "function*", arglist, th);
if (improper_list_p(arglist))
error(ILLEGAL_ARGS, "function*", arglist, th);
if (symbolp(arg1)) {
int res;
res = find_env(arg1, th);
if (IS_FUNC(res))
return (res);
else if (GET_CAR(arg1) != NIL)
return (GET_CAR(arg1));
else
return (NIL);
} else if (listp(arg1) && eqp(car(arg1), make_sym("lambda")))
return (eval(arg1, th));
else
return (NIL);
return (UNDEF);
}
int f_symbol_function(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "symbol-function", arglist, th);
if (symbolp(arg1)) {
int sym, res;
sym = find_env(arg1, th);
if (sym == FAILSE && GET_CDR(arg1) != NIL)
sym = GET_CDR(arg1);
if (!symbolp(sym))
error(UNDEF_FUN, "symbol-function", arg1, th);
res = find_env(sym, th);
if (IS_FUNC(res))
return (res);
else if (GET_CAR(sym) != NIL)
return (GET_CAR(sym));
else
error(UNDEF_FUN, "symbol-function", sym, th);
} else
error(ILLEGAL_ARGS, "symbol-function", arg1, th);
return (UNDEF);
}
int f_class(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "class", arglist, th);
if (!symbolp(arg1))
error(NOT_SYM, "class", arglist, th);
if (GET_AUX(arg1) == NIL)
error(UNDEF_CLASS, "class", arg1, th);
if (GET_AUX(arg1) == csymbol && GET_OPT(arg1) != SYSTEM)
error(UNDEF_CLASS, "class", arg1, th);
return (GET_AUX(arg1));
}
int f_symbol_class(int arglist, int th)
{
int arg1;
arg1 = car(arglist);
if (length(arglist) != 1)
error(WRONG_ARGS, "symbol-class", arglist, th);
if (symbolp(arg1)) {
int sym;
sym = find_env(arg1, th);
if (sym == FAILSE && GET_CDR(arg1) != NIL)
sym = GET_CDR(arg1);
if (!symbolp(sym))
error(UNDEF_CLASS, "symbol-class", arg1, th);
if (GET_AUX(sym) == NIL)
error(UNDEF_CLASS, "symbol-class", sym, th);
if (GET_AUX(sym) == csymbol && GET_OPT(sym) != SYSTEM)
error(UNDEF_CLASS, "class", sym, th);
return (GET_AUX(sym));
} else {
error(ILLEGAL_ARGS, "symbol-class", arg1, th);
return (UNDEF);
}
}
int f_if(int arglist, int th)
{
int arg1, arg2, arg3, n;
arg1 = car(arglist);
arg2 = cadr(arglist);
if ((n = length(arglist)) < 2 || n > 3)
error(WRONG_ARGS, "if", arglist, th);
if (improper_list_p(arglist))
error(WRONG_ARGS, "if", arglist, th);
if (length(arglist) == 3)
arg3 = car(cdr(cdr(arglist)));
else
arg3 = NIL;
if (!(nullp(eval(arg1, th))))
return (eval(arg2, th));
else {
return (eval(arg3, th));
}
}
int f_cond(int arglist, int th)
{
int arg1, arg2, arg3;
if (nullp(arglist))
return (NIL);
arg1 = car(arglist);
arg2 = car(arg1);
arg3 = cdr(arg1);
if (nullp(arg1))
error(IMPROPER_ARGS, "cond", arglist, th);
if (improper_list_p(arg1))
error(IMPROPER_ARGS, "cond", arg1, th);
if (length(arg1) == 1 && atomp(arg2) && !nullp(eval(arg2, th)))
return (arg2);
else if (!nullp(eval(arg2, th)))
return (f_progn(arg3, th));
else
return (f_cond(cdr(arglist), th));
}
int f_while(int arglist, int th)
{
int arg1, arg2;
arg1 = car(arglist);
arg2 = cdr(arglist);
while (eval(arg1, th) != NIL) {
f_progn(arg2, th);
}
return (NIL);
}
int f_for(int arglist, int th)
{
int arg1, arg2, arg3, iter, temp, save, res, temparg2;
arg1 = car(arglist);
arg2 = cadr(arglist);
arg3 = cddr(arglist);
if (length(arglist) < 2)
error(WRONG_ARGS, "for", arglist, th);
if (!listp(arg1))
error(NOT_LIST, "for", arg1, th);
if (!listp(arg2))
error(NOT_LIST, "for", arg2, th);
if (nullp(arg2))
error(IMPROPER_ARGS, "for", arg2, th);
temp = arg1;
temparg2 = NIL;
while (!nullp(temp)) {
int temp1, temparg1;
temp1 = car(temp);
if (!listp(temp1))
error(IMPROPER_ARGS, "for", temp1, th);
temparg1 = car(temp1);
if (!symbolp(temparg1))
error(NOT_SYM, "for", temparg1, th);
if (STRING_REF(temparg1, 0) == ':'
|| STRING_REF(temparg1, 0) == '&')
error(WRONG_ARGS, "for", arg1, th);
if (temparg1 == T || temparg1 == NIL
|| temparg1 == make_sym("*PI*")
|| temparg1 == make_sym("*MOST-POSITIVE-FLOAT*")
|| temparg1 == make_sym("*MOST-NEGATIVE-FLOAT*"))
error(WRONG_ARGS, "for", temparg1, th);
if (length(temp1) != 2 && length(temp1) != 3)
error(IMPROPER_ARGS, "for", temp1, th);
if (member(temparg1, temparg2))
error(IMPROPER_ARGS, "for", temparg1, th);
temparg2 = cons(temparg1, temparg2);
temp = cdr(temp);
}
save = ep[th];
iter = arg1;
/* initilize local variable */
while (iter != NIL) {
add_lex_env(caar(iter), eval(cadar(iter), th), th);
iter = cdr(iter);
}
/* check condition of end */
while (eval(car(arg2), th) == NIL) {
int save1;
save1 = ep[th];
shelter_push(arg3, th);
f_progn(arg3, th); /* do body */
shelter_pop(th);
ep[th] = save1;
iter = arg1; /* update local variable */
temp = NIL;
while (iter != NIL) {
if (!nullp(caddar(iter))) { /* update part is not null */
shelter_push(iter, th);
shelter_push(temp, th);
temp =
cons(cons(caar(iter), eval(caddar(iter), th)), temp);
shelter_pop(th);
shelter_pop(th);
}
iter = cdr(iter);
}
while (temp != NIL) {
set_lex_env(caar(temp), cdar(temp), th);
temp = cdr(temp);
}
}
res = f_progn(cdr(arg2), th);
ep[th] = save;
return (res);
}
int f_block(int arglist, int th)
{
int arg1, arg2, tag, ret, res, unwind;
arg1 = car(arglist);