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#include "tl.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* public list functions
*/
struct tl_list *tl_new(const char *name,
const char *data,
struct tl_list *list,
struct tl_list *next)
{
struct tl_list *res = malloc(sizeof(*res));
res->name = name;
res->data = data;
res->list = list;
res->next = next;
return res;
}
struct tl_list *tl_plain_list(struct tl_list *list, struct tl_list *next)
{
return tl_new(0, 0, list, next);
}
struct tl_list *tl_named_list(const char *name,
struct tl_list *list,
struct tl_list *next)
{
return tl_new(name, 0, list, next);
}
struct tl_list *tl_named_data(const char *name,
const char *data,
struct tl_list *next)
{
return tl_new(name, data, 0, next);
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* internal list functions
*/
static struct tl_list *tl_list_union(struct tl_list *a, struct tl_list *b)
{ /* Copy a appending copy of b. */
if (!a) return b ? tl_list_union(b, 0) : 0;
return tl_new(a->name, a->data,
tl_list_union(a->list, 0),
tl_list_union(a->next, b));
}
static struct tl_list *tl_list_get(struct tl_list *l, char *name)
{
if (!l) return 0;
if (!strcmp(l->name, name)) return l;
return tl_list_get(l->next, name);
}
static void tl_list_free(struct tl_list *l)
{
if (l->list) tl_list_free(l->list);
if (l->next) tl_list_free(l->next);
free(l);
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* string
* Strings are represented as usual char * null-terminated string.
* Size and length are stored before the string (so it is a fat pointer).
*/
static int *tl_string_size(char *str) { return ((int *) str) - 2; }
static int *tl_string_len(char *str) { return ((int *) str) - 1; }
static void tl_string_add(char **str, char c)
{
static const int shift = 2 * sizeof(int);
if (!*str) {
*str = malloc(shift + 1);
*str += shift;
*tl_string_size(*str) = 1;
*tl_string_len(*str) = 0;
(*str)[0] = 0;
}
++*tl_string_len(*str);
if (*tl_string_size(*str) == *tl_string_len(*str)) {
*tl_string_size(*str) *= 2;
*str = realloc(*str - shift, shift + *tl_string_size(*str));
*str += shift;
}
(*str)[*tl_string_len(*str) - 1] = c;
(*str)[*tl_string_len(*str)] = 0;
}
static void tl_string_free(char *str)
{
if (str) free(str - 2 * sizeof(int));
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* template language translator as automata
* Automata states are functions, consuming a character, changing automata,
* returning new state and outputting substituted text.
*/
struct tl {
struct tl_list *variables;
char *name;
char *body;
int opened;
};
typedef void *(*tl_state)(struct tl *t, char c);
static void tl_free(struct tl *t)
{
if (t->variables) tl_list_free(t->variables);
if (t->name) tl_string_free(t->name);
if (t->body) tl_string_free(t->body);
}
static void *tl_state_text(struct tl *t, char c);
void tl_translate(struct tl_list *l)
{
int c;
tl_state state = tl_state_text;
struct tl automata = { l, 0, 0, 0 };
while ((c = getchar()) != EOF) {
state = state(&automata, c);
}
tl_free(&automata);
}
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* automata states
*/
static void *tl_state_backslash(struct tl *t, char c);
static void *tl_state_at(struct tl *t, char c);
static void *tl_state_subs(struct tl *t, char c);
static void *tl_state_text(struct tl *t, char c)
{ /* Normal state is to just copy input, switching state on specials. */
if (c == '\\') return tl_state_backslash;
if (c == '@') return tl_state_at;
if (c == '{') return tl_state_subs;
putchar(c);
return tl_state_text;
}
static void *tl_state_subs(struct tl *t, char c)
{ /* Read name until } and output value from variables of this name. */
if (c == '}') {
struct tl_list *var = tl_list_get(t->variables, t->name);
if (var && var->data) {
fputs(var->data, stdout);
}
tl_string_free(t->name);
t->name = 0;
return tl_state_text;
}
tl_string_add(&t->name, c);
return tl_state_subs;
}
static void *tl_state_body(struct tl *t, char c);
static void *tl_state_at(struct tl *t, char c)
{ /* Read name until { and start reading body after it. */
if (c == '{') return tl_state_body;
tl_string_add(&t->name, c);
return tl_state_at;
}
static void tl_at(struct tl *t)
{ /* Repeat the body substitution in context of readed name. */
struct tl_list *var = tl_list_get(t->variables, t->name);
for (var = var->list; var; var = var->next) {
char *c;
tl_state state = tl_state_text;
struct tl automata = { 0, 0, 0, 0 };
automata.variables = tl_list_union(var->list, t->variables);
for (c = t->body; *c; ++c) {
state = state(&automata, *c);
}
tl_free(&automata);
}
}
static void *tl_state_body(struct tl *t, char c)
{ /* Read the body until } respecting nesting and call tl_at. */
if (c == '{') ++t->opened;
else if (c == '}' && !t->opened--) {
tl_at(t);
t->opened = 0;
tl_string_free(t->name);
t->name = 0;
tl_string_free(t->body);
t->body = 0;
return tl_state_text;
}
tl_string_add(&t->body, c);
return tl_state_body;
}
static void *tl_state_backslash(struct tl *t, char c)
{ /* Output newline for \n, nothing for \ and newline, and copy the rest. */
if (c == 'n') putchar('\n');
else if (c != '\n') putchar(c);
return tl_state_text;
}
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