/* start parsing the input line */
static void parse_input(cmds* cmd)
{
cmds* elem;
/* examine first token */
scan();
if (lookahead.kind==END)
{
return;
}
/* create new command element, add it to the list, and parse it */
elem = cmd_new();
if (cmd==NULL)
{
root=cmd=elem;
}
else
{
cmd->next = elem;
}
parse_pipe(elem, &elem->prog);
/* parse next command from input */
parse_input(elem);
}
static char parse_logic(t_token **list, t_node **tree)
{
t_node *node;
t_token *save;
if ((node = ft_nodenew(LOGIC)) != NULL && parse_pipe(list, &node->left))
{
save = *list;
if (ft_tokenstep(list) && is_logic((*list)->data, node)
&& (*list)->type == SPECIAL)
{
if (!ft_tokenstep(list) || !parse_logic(list, &node->right))
return (!ft_clear_tree(&node));
}
else
*list = save;
if (node->right)
*tree = node;
else
{
*tree = node->left;
free(node->data);
free(node);
}
return (1);
}
return (!ft_clear_tree(&node));
}
static void parse_pipe(cmds* cmd, prog_args* prog)
{
prog_args* elem = NULL;
/* parse a command */
parse_cmd(cmd, prog);
/* not in pipe? */
if (lookahead.kind!=STROKE)
{
return;
}
/* builtin and starting pipe? */
if( !(cmd->kind==PROG || cmd->kind==PIPE) )
{
raise_error(PARSER_ILLEGAL_COMBINATION);
}
/* in pipe */
cmd->kind=PIPE;
/* output redirection? */
if (prog->output != NULL)
{
raise_error(PARSER_ILLEGAL_REDIRECTION);
}
/* skip pipe symbol and parse next command */
scan();
elem = prog_new();
prog->next=elem;
parse_pipe(cmd,elem);
}
static Command* parse_cmdline(char* buf)
{
/*if (nr_token > 0) reset_parser();*/
/*dump_tokens(buf);*/
if (nr_token > 0) reset_parser();
return parse_pipe(buf);
}
static struct ast_node *parse_pipe(struct parser_context *context)
{
struct ast_node *left = parse_val(context);
if(token_match(context, TOK_PIPE)) {
token_read(context);
struct ast_node *rdir = node_create(NODE_PIPE, sizeof(struct ast_node));
node_add_child(rdir, left);
node_add_child(rdir, parse_pipe(context));
return rdir;
}
return left;
}
t_point init_def(Hash *h, char *name, int level)
{
Function *f = new_Function(NIL, 0);
t_point s = make_Func(f);
HashMember *hm = NULL;
if (name != NULL) {
hm = add_string_Hash(h, name, s);
hm->info = level;
if (level == 0) gc_inc_immortal(s);
}
Hash *new_h = clone_Hash(h);
char chars[MAX_NAME_LENGTH];
int param_counter = level;
// nacteni parametru funkce
while (is_whitespace(chars[0] = read_char()));
if (chars[0] != OPEN_TAG) ERROR(SYNTAX_ERROR);
while (read_word(chars, 1))
add_string_Hash(new_h, chars, pnew_Param(++param_counter));
if (chars[0] != '\0') {
add_string_Hash(new_h, chars, pnew_Param(++param_counter));
// nastaveni parametru se zbytkem z volani
if (chars[0] == REMAIN_PARAMS_TAG) {
f->more_params = 1;
param_counter--;
}
}
// asociace funkce
f->built_in = 0;
f->params_count = param_counter;
// vytvoreni tela funkce
f->body.structure = parse_pipe(new_h, param_counter+f->more_params);
free_Hash(new_h);
return make_Func(f);
}
void play()
{
gc_init();
Hash *h = get_basic_hash();
t_point parsed;
char c;
while ((c = read_char()) != EOF) {
if (c == OPEN_TAG) {
parsed = parse_pipe(h, 0);
if (parsed != NIL && quiet) {
resolve_Thunk(parsed);
} else if (parsed != NIL && !quiet) {
print_Symbol(parsed);
} else if (prompt && !quiet)
printf("OK\n");
gc();
}
}
#ifdef DEBUG
printf("\n\n"); gc_score();
#endif
}
t_point parse_pipe(Hash *h, int level)
{
char chars[MAX_NAME_LENGTH];
char *c = chars;
int whitespaces = 1; // cetli jsme whitespace?
int first = 1;
int is_def = 0;
int is_close_tag = 0;
Cons all = {NIL, NIL};
Cons *l = &all;
t_point s = NIL;
while ((c - chars) < MAX_NAME_LENGTH && (*c = read_char()) != EOF) {
if (is_whitespace(*c) || (is_close_tag = (*c == CLOSE_TAG))) {
if (whitespaces && !is_close_tag) continue;
*c = '\0';
whitespaces = 1;
if (first && ((is_def = (strcmp(chars, "def") == 0))
|| (strcmp(chars, "lambda") == 0)))
{
if (is_close_tag) ERROR(SYNTAX_ERROR);
if (is_def) {
// is def
if (!read_word(chars, 0)) ERROR(SYNTAX_ERROR);
init_def(h, chars, level);
} else {
// is lambda
return kontext_params(init_def(h, NULL, level), level);
}
break;
}
// c is not empy
if (c != chars) {
l->b = create_token(h, chars, level);
if (first) {
l->a = l->b;
l->b = NIL;
} else {
l->b = pnew_List(l->b);
l = next(l);
}
}
if (is_close_tag) break;
c = chars;
first = 0;
continue;
}
// nacitame dal
if (!whitespaces) { c++; continue; }
switch (*c) {
case '\'': s = parse_char(); break;
case '"': s = parse_string(); break;
case OPEN_TAG: s = parse_pipe(h, level); break;
default: c++; whitespaces = 0; continue;
}
if (s != NIL) {
if (first) {
l->a = s;
l->b = NIL;
first = 0;
} else {
l->b = pnew_List(s);
l = next(l);
}
s = NIL;
}
}
if ((c - chars) >= MAX_NAME_LENGTH)
ERROR(SYNTAX_ERROR);
if (all.b == NIL && !is_Func(all.a))
return all.a;
else
return pnew_Thunk(all.a, get_Cons(all.b));
}
