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#include <stdlib.h>
#include <stdio.h>
#include <string.h>
struct reus_list {
const char *name;
const char *data;
struct reus_list *list;
struct reus_list *next;
};
struct reus {
struct reus_list *variables;
char *name;
char *body;
int opened;
};
typedef void *(*reus_state)(struct reus *r, char c);
void reus_string_add(char **str, char c)
{
int *header;
if (!*str) {
header = malloc(9);
*str = (char *) header + 8;
header[0] = 1;
header[1] = 0;
(*str)[0] = 0;
} else header = (int *)(*str - 8);
if (header[0] == ++header[1]) {
header = realloc(header, 8 + (header[0] <<= 1));
*str = (char *) header + 8;
}
(*str)[header[1] - 1] = c;
(*str)[header[1]] = 0;
}
struct reus_list *reus_list_new(const char *name,
const char *data,
struct reus_list *list,
struct reus_list *next)
{
struct reus_list *res = malloc(sizeof(*res));
res->name = name;
res->data = data;
res->list = list;
res->next = next;
return res;
}
struct reus_list *reus_list_union(struct reus_list *a, struct reus_list *b)
{
if (!a) return b ? reus_list_union(b, 0) : 0;
return reus_list_new(a->name, a->data,
reus_list_union(a->list, 0),
reus_list_union(a->next, b));
}
struct reus_list *reus_list_get(struct reus_list *l, char *name)
{
if (!l) return 0;
if (!strcmp(l->name, name)) return l;
return reus_list_get(l->next, name);
}
void reus_list_free(struct reus_list *l)
{
if (l->list) reus_list_free(l->list);
if (l->next) reus_list_free(l->next);
free(l);
}
void reus_init(struct reus *r)
{
r->variables = 0;
r->name = 0;
r->body = 0;
r->opened = 0;
}
void reus_free(struct reus *r)
{
if (r->variables) reus_list_free(r->variables);
if (r->name) free(r->name - 8);
if (r->body) free(r->body - 8);
}
void *reus_state_at(struct reus *r, char c);
void *reus_state_subs(struct reus *r, char c);
void *reus_state_text(struct reus *r, char c)
{
if (c == '@') return reus_state_at;
if (c == '{') return reus_state_subs;
putchar(c);
return reus_state_text;
}
void *reus_state_subs(struct reus *r, char c)
{
if (c == '}') {
struct reus_list *var = reus_list_get(r->variables, r->name);
if (var && var->data) {
printf("%s", var->data);
}
free(r->name - 8);
r->name = 0;
return reus_state_text;
}
reus_string_add(&r->name, c);
return reus_state_subs;
}
void reus_at(struct reus *r)
{
struct reus_list *var = reus_list_get(r->variables, r->name);
for (var = var->list; var; var = var->next) {
char *c;
struct reus sr;
reus_state s = reus_state_text;
reus_init(&sr);
sr.variables = reus_list_union(var->list, r->variables);
for (c = r->body; *c; ++c) {
s = s(&sr, *c);
}
reus_free(&sr);
}
}
void *reus_state_body(struct reus *r, char c);
void *reus_state_at(struct reus *r, char c)
{
if (c == '{') return reus_state_body;
reus_string_add(&r->name, c);
return reus_state_at;
}
void *reus_state_body(struct reus *r, char c)
{
if (c == '{') ++r->opened;
if (c == '}' && !r->opened--) {
reus_at(r);
r->opened = 0;
free(r->name - 8);
r->name = 0;
free(r->body - 8);
r->body = 0;
return reus_state_text;
}
reus_string_add(&r->body, c);
return reus_state_body;
}
int main()
{
int c;
struct reus r;
reus_state s = reus_state_text;
reus_init(&r);
r.variables =
reus_list_new("username", "aversey", 0,
reus_list_new("articles", 0,
reus_list_new(0, 0,
reus_list_new("title", "Smooth Sort", 0,
reus_list_new("author", "Edsger Dijkstra", 0, 0)),
reus_list_new(0, 0,
reus_list_new("title", "Your Own Site", 0,
reus_list_new("author", "Aleksey Veresov", 0, 0)),
reus_list_new(0, 0,
reus_list_new("title", "Bullshit", 0,
reus_list_new("author", "Ongo Gablogian", 0, 0)), 0))), 0));
while ((c = getchar()) != EOF) {
s = s(&r, c);
}
reus_free(&r);
return 0;
}
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