int main (int argc, char **argv) { // parse args struct arguments arguments; arguments.argc = 0; argp_parse (&argp, argc, argv, 0, 0, &arguments); char *filename = arguments.args[0]; LClosure *closure = l_closure_new(NULL); l_closure_set_funcs(closure); LValue* f = l_value_new(L_STR_TYPE, closure); f->core.str = make_stringbuf((char*)filename); l_closure_set(closure, "-script", f, true); LValue *arg; LValue *args = l_value_new(L_LIST_TYPE, closure); args->core.list = create_vector(); int i; for(i=1; i<arguments.argc; i++) { arg = l_value_new(L_STR_TYPE, closure); arg->core.str = make_stringbuf(arguments.args[i]); vector_add(args->core.list, arg, sizeof(arg)); } l_closure_set(closure, "-args", args, true); l_eval_path(filename, closure); exit(0); }
LValue *l_eval_call_args(LNode *node, LValue *func, LClosure *outer_closure, LClosure *inner_closure) { int i, argc; LValue *v, *args_val, **ref; LNode **args; if(node != NULL) { argc = node->exprc; args = node->exprs; } else { argc = 0; args = NULL; } if(outer_closure != inner_closure) { // initialize all args to nil for(i=0; i<func->core.func.argc; i++) { v = l_value_new(L_NIL_TYPE, inner_closure); l_closure_set(inner_closure, func->core.func.args[i]->val, v, true); } } // setup the arguments args_val = l_value_new(L_LIST_TYPE, inner_closure); args_val->core.list = create_vector(); LValue ***args_ref = malloc(sizeof(LValue**) * argc); // set all passed args for(i=0; i<argc; i++) { if(args[i]->type == L_VAR_TYPE) { // pass vars by reference ref = l_closure_get_ref(outer_closure, args[i]->val); if(ref != NULL) { args_ref[i] = ref; v = *ref; } else { // handle error l_eval_var_node(args[i], outer_closure); } } else { // eval as normal and set the value v = l_eval_node(args[i], outer_closure); ref = malloc(sizeof(LValue*)); *ref = v; args_ref[i] = ref; } // append to 'args' variable vector_add(args_val->core.list, v, sizeof(v)); } for(i=0; i<func->core.func.argc; i++) { l_ref_put(inner_closure->locals, func->core.func.args[i]->val, args_ref[i]); } l_closure_set(inner_closure, "args", args_val, true); return args_val; }
void l_eval_path(const char *filename, LClosure *closure) { FILE *fp = fopen(filename, "r"); if(fp == NULL) { printf("An error occurred while opening the file %s.\n", filename); exit(1); } LValue* f = l_value_new(L_STR_TYPE, closure); f->core.str = make_stringbuf((char*)filename); l_closure_set(closure, "-filename", f, true); stringbuf *source = make_stringbuf(""); source->str = saferead(fp); l_eval(source->str, filename, closure); }
LValue *l_eval_assign_node(LNode *node, LClosure *closure) { LValue *value = l_eval_node(node->exprs[0], closure); l_closure_set(closure, node->val, value, false); return value; }
LValue *l_eval_call_node(LNode *node, LValue *func, LClosure *closure) { if(func == NULL) func = l_eval_var_node(node, closure); char *name = (node != NULL) ? node->val : ""; LValue *value, *args_val; LNode *expr; int i; // create a running scope to hold arguments // and a reference to self (for recursion) // TODO this may not be necessary (can't we just do `cl=func->core.func.closure`?) LClosure *cl = l_closure_clone(func->core.func.closure, node); tail_loop: l_debug(L_DEBUG_CALL) { if(node) printf(">>> entering %s on line %d in %s\n", name, node->line_no, node->source_file); else printf(">>> entering %s\n", name); } if(strcmp(name, "") != 0) l_closure_set(cl, name, func, true); args_val = l_eval_call_args(node, func, closure, cl); if(func->core.func.ptr != NULL) { // native C code if(!setjmp(cl->jmp)) { value = func->core.func.ptr(args_val, cl); } else { // function called longjmp to initiate a tail call l_debug(L_DEBUG_CALL) printf("^^^ reached end of %s (longjmp tail call)\n", name); node = NULL; func = l_closure_get(cl, "--tail-call--"); closure = cl; l_closure_backfill(func->core.func.closure, cl, node); name = ""; goto tail_loop; } } else { // Lydia code int exprc = func->core.func.exprc; if(exprc > 0) { // eval all but the last expression for(i=0; i<exprc-1; i++) { expr = func->core.func.exprs[i]; value = l_eval_node(expr, cl); } expr = func->core.func.exprs[exprc-1]; if(expr->type == L_CALL_TYPE) { // tail call l_debug(L_DEBUG_CALL) printf("^^^ reached end of %s (tail call)\n", name); node = expr; func = l_eval_var_node(node, cl); closure = cl; l_closure_backfill(func->core.func.closure, cl, node); name = node->val; goto tail_loop; } else { value = l_eval_node(expr, cl); } } else { value = l_value_new(L_NIL_TYPE, cl); } } l_closure_free(cl); l_debug(L_DEBUG_CALL) printf("<<< returning from %s\n", name); return value; }
// sets misc global vars void l_create_globals(LClosure *closure) { l_closure_set(closure, "nil", l_value_new(L_NIL_TYPE, closure), false); l_closure_set(closure, "false", l_value_new(L_FALSE_TYPE, closure), false); l_closure_set(closure, "true", l_value_new(L_TRUE_TYPE, closure), false); }
// inserts given function as given name in given closure void l_insert_func(char *name, struct LValue* (*ptr)(struct LValue*, LClosure*), LClosure *closure) { LValue *f = l_func_new(ptr, closure); l_closure_set(closure, name, f, false); }