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#include "group.h"
#include "token.h"
#include <stdlib.h>
#include <stdio.h>
static int
group_enclosed(Token **list, unsigned int open_tok, unsigned int clos_tok,
unsigned int group_type)
{
for (;;) {
Token *begin = token_search(*list, open_tok);
Token *end = token_search_closing(begin, clos_tok,
open_tok);
if (begin == NULL && end == NULL)
break;
if (begin == NULL || end == NULL) {
fprintf(stderr, "unclosed pair\n");
return 1;
}
Token *group = group_create(list, begin, end);
if (group == NULL) {
fprintf(stderr, "group_create failed\n");
return 1;
}
group->group.type = group_type;
token_delete(&group->group.tokens, begin);
token_delete(&group->group.tokens, end);
if (group_scope(&group->group.tokens)) {
fprintf(stderr, "group_enclosed failed\n");
return 1;
}
}
for (Token *e = *list; e != NULL; e = e->next)
if (e->type == TOK_GROUP)
group_enclosed(&e->group.tokens, open_tok, clos_tok,
group_type);
return 0;
}
Token *
group_create(Token **list, Token *begin, Token *end)
{
Token *group = malloc(sizeof(Token));
if (group == NULL) {
perror("group_create:malloc");
return NULL;
}
group->type = TOK_GROUP;
group->group.type = GROUP_NONE;
group->group.tokens = begin;
group->group.scope = NULL;
group->prev = begin->prev;
group->next = end->next;
begin->prev = NULL;
end->next = NULL;
if (*list == begin)
*list = group;
else if (group->prev != NULL)
group->prev->next = group;
if (group->next != NULL)
group->next->prev = group;
return group;
}
void
group_extract(Token **list, Token *group)
{
if (group->type != TOK_GROUP)
return;
if (group->group.scope != NULL)
token_destroy(group->group.scope);
if (*list == group) {
if ((*list)->next != NULL) {
(*list)->next->prev = group->group.tokens;
token_last(group->group.tokens)->next = (*list)->next;
}
*list = group->group.tokens;
} else {
if (group->prev != NULL)
group->prev->next = group->group.tokens;
if (group->next != NULL)
group->next->prev = token_last(group->group.tokens);
}
free(group);
}
int
group_scope(Token **list)
{
return group_enclosed(list, TOK_OPEN_CURL, TOK_CLOS_CURL, GROUP_SCOPE);
}
int
group_funcall(Token **list)
{
return group_enclosed(list, TOK_OPEN_PAREN, TOK_CLOS_PAREN,
GROUP_FUNCALL);
}
int
group_deref(Token **list)
{
return group_enclosed(list, TOK_OPEN_SQUAR, TOK_CLOS_SQUAR,
GROUP_DEREF);
}
int
group_atom(Token **list)
{
// Recurse in child GROUP_SCOPEs.
for (Token *e = *list; e != NULL; e = e->next)
if (token_isgroup(e, GROUP_SCOPE))
if (group_atom(&e->group.tokens))
return 1;
Token *e = *list;
for (;;) {
Token *end = token_search(e, TOK_END);
if (end == NULL)
break;
if (end != *list) {
Token *group = group_create(list, e, end->prev);
if (group == NULL) {
fprintf(stderr, "group_create failed\n");
return 1;
}
group->group.type = GROUP_ATOM;
e = end->next;
}
token_delete(list, end);
}
return 0;
}
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