static LakeVal *_lambda(LakeCtx *ctx, Env *env, LakeList *expr)
{
/* (lambda (a b c) ...) */
if (LIST_N(expr) >= 3 && lake_is_type(TYPE_LIST, LIST_VAL(expr, 1))) {
list_shift(expr); /* drop the "lambda" symbol */
LakeList *params = LIST(list_shift(expr));
LakeList *body = expr;
return VAL(fn_make(params, NULL, body, env));
}
else if (LIST_N(expr) >= 3 && lake_is_type(TYPE_DLIST, LIST_VAL(expr, 1))) {
list_shift(expr); /* drop the "lambda" symbol */
LakeDottedList *def = DLIST(list_shift(expr));
LakeList *params = dlist_head(def);
LakeSym *varargs = SYM(dlist_tail(def));
LakeList *body = expr;
return VAL(fn_make(params, varargs, body, env));
}
else if (LIST_N(expr) >= 3 && lake_is_type(TYPE_SYM, LIST_VAL(expr, 1))) {
list_shift(expr); /* drop the "lambda" symbol */
LakeSym *varargs = SYM(list_shift(expr));
LakeList *body = expr;
return VAL(fn_make(list_make(), varargs, body, env));
}
else {
invalid_special_form(expr, "lambda requires at least 2 parameters");
return NULL;
}
}
static void exec( char *program, char *param ) {
static char *args[3];
int retcode;
assert( program != NULL );
assert( param != NULL );
#if DEBUG
printf("*** Search '%s'\n", program );
#endif
fn_split( program );
args[0] = xfind( fn_make(".exe"), getrundir() );
args[1] = param;
args[2] = NULL;
#if DEBUG
printf("*** Run '%s' '%s'\n", args[0], args[1] );
#endif
retcode = spawnvp( P_WAIT, args[0], (void *)args );
if ( retcode > 0 ) {
fprintf( stderr, "\n'%s' exitcode = %d\n", program, retcode );
if (! get_option(OPT_KEEPRSP) )
unlink( RESPONSE );
exit( retcode );
} else if ( retcode < 0 ) {
perror( program );
if (! get_option(OPT_KEEPRSP) )
unlink( RESPONSE );
exit(1);
}
}
static LakeVal *_define(LakeCtx *ctx, Env *env, LakeList *expr)
{
/* TODO: make these more robust, check all expected params */
/* (define x 42) */
if (LIST_N(expr) == 3 && lake_is_type(TYPE_SYM, LIST_VAL(expr, 1))) {
list_shift(expr); /* drop the "define" symbol */
LakeSym *var = SYM(list_shift(expr));
LakeVal *form = list_shift(expr);
env_define(env, var, eval(ctx, env, form));
}
/* (define (inc x) (+ 1 x)) */
else if (LIST_N(expr) >= 3 && lake_is_type(TYPE_LIST, LIST_VAL(expr, 1))) {
list_shift(expr); /* drop the "define" symbol */
LakeList *params = LIST(list_shift(expr));
LakeSym *var = SYM(list_shift(params));
LakeList *body = expr;
env_define(env, var, VAL(fn_make(params, NULL, body, env)));
}
/* (define (print format . args) (...)) */
else if (LIST_N(expr) >= 3 && lake_is_type(TYPE_DLIST, LIST_VAL(expr, 1))) {
list_shift(expr); /* drop the "define" symbol */
LakeDottedList *def = DLIST(list_shift(expr));
LakeList *params = dlist_head(def);
LakeSym *varargs = SYM(dlist_tail(def));
LakeSym *var = SYM(list_shift(params));
LakeList *body = expr;
env_define(env, var, VAL(fn_make(params, varargs, body, env)));
}
else {
invalid_special_form(expr, "define requires at least 2 parameters");
}
return NULL;
}
