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/*
* blogc: A blog compiler.
* Copyright (C) 2014-2016 Rafael G. Martins <rafael@rafaelmartins.eng.br>
*
* This program can be distributed under the terms of the BSD License.
* See the file LICENSE.
*/
#include <stdbool.h>
#include <stdlib.h>
#include "error.h"
#include "utils.h"
#include "config-parser.h"
typedef enum {
CONFIG_START = 1,
CONFIG_SECTION_START,
CONFIG_SECTION,
CONFIG_SECTION_KEY,
CONFIG_SECTION_VALUE_START,
CONFIG_SECTION_VALUE,
} bc_configparser_state_t;
bc_config_t*
bc_config_parse(const char *src, size_t src_len, bc_error_t **err)
{
if (err != NULL && *err != NULL)
return NULL;
size_t current = 0;
size_t start = 0;
bc_trie_t *section = NULL;
char *section_name = NULL;
char *key = NULL;
char *value = NULL;
bc_config_t *rv = bc_malloc(sizeof(bc_config_t));
rv->root = bc_trie_new((bc_free_func_t) bc_trie_free);
bc_configparser_state_t state = CONFIG_START;
while (current < src_len) {
char c = src[current];
bool is_last = current == src_len - 1;
switch (state) {
case CONFIG_START:
if (c == '#' || c == ';') {
while (current < src_len) {
if (src[current] == '\r' || src[current] == '\n')
break;
current++;
}
break;
}
if (c == ' ' || c == '\t' || c == '\r' || c == '\n')
break;
if (c == '[') {
state = CONFIG_SECTION_START;
break;
}
if (section != NULL) {
start = current;
state = CONFIG_SECTION_KEY;
continue;
}
if (err != NULL)
*err = bc_error_parser(BC_ERROR_CONFIG_PARSER, src, src_len,
current, "File must start with section.");
break;
case CONFIG_SECTION_START:
start = current;
state = CONFIG_SECTION;
break;
case CONFIG_SECTION:
if (c == ']') {
section_name = bc_strndup(src + start, current - start);
section = bc_trie_new(free);
bc_trie_insert(rv->root, section_name, section);
free(section_name);
section_name = NULL;
state = CONFIG_START;
break;
}
if (c != '\r' && c != '\n')
break;
if (err != NULL)
*err = bc_error_parser(BC_ERROR_CONFIG_PARSER, src, src_len,
current, "Section names can't have new lines.");
break;
case CONFIG_SECTION_KEY:
if (c == '=') {
key = bc_strndup(src + start, current - start);
state = CONFIG_SECTION_VALUE_START;
break;
}
if (c != '\r' && c != '\n' && !is_last)
break;
// key without value, should we support it?
if (err != NULL) {
size_t end = is_last && c != '\n' && c != '\r' ? src_len :
current;
key = bc_strndup(src + start, end - start);
*err = bc_error_parser(BC_ERROR_CONFIG_PARSER, src, src_len,
current, "Key without value: %s.", key);
free(key);
key = NULL;
}
break;
case CONFIG_SECTION_VALUE_START:
start = current;
state = CONFIG_SECTION_VALUE;
break;
case CONFIG_SECTION_VALUE:
if (c == '\r' || c == '\n' || is_last) {
size_t end = is_last && c != '\n' && c != '\r' ? src_len :
current;
value = bc_strndup(src + start, end - start);
bc_trie_insert(section, bc_str_strip(key),
bc_strdup(bc_str_strip(value)));
free(key);
key = NULL;
free(value);
value = NULL;
state = CONFIG_START;
break;
}
break;
}
if (err != NULL && *err != NULL) {
bc_config_free(rv);
rv = NULL;
break;
}
current++;
}
free(section_name);
free(key);
free(value);
return rv;
}
static void
list_keys(const char *key, const char *value, bc_slist_t **l)
{
*l = bc_slist_append(*l, bc_strdup(key));
}
char**
bc_config_list_sections(bc_config_t *config)
{
if (config == NULL)
return NULL;
bc_slist_t *l = NULL;
bc_trie_foreach(config->root, (bc_trie_foreach_func_t) list_keys, &l);
char **rv = bc_malloc(sizeof(char*) * (bc_slist_length(l) + 1));
unsigned int i = 0;
for (bc_slist_t *tmp = l; tmp != NULL; tmp = tmp->next, i++)
rv[i] = tmp->data;
rv[i] = NULL;
bc_slist_free(l);
return rv;
}
char**
bc_config_list_keys(bc_config_t *config, const char *section)
{
if (config == NULL)
return NULL;
bc_trie_t *s = bc_trie_lookup(config->root, section);
if (s == NULL)
return NULL;
bc_slist_t *l = NULL;
bc_trie_foreach(s, (bc_trie_foreach_func_t) list_keys, &l);
char **rv = bc_malloc(sizeof(char*) * (bc_slist_length(l) + 1));
unsigned int i = 0;
for (bc_slist_t *tmp = l; tmp != NULL; tmp = tmp->next, i++)
rv[i] = tmp->data;
rv[i] = NULL;
bc_slist_free(l);
return rv;
}
const char*
bc_config_get(bc_config_t *config, const char *section, const char *key)
{
if (config == NULL)
return NULL;
bc_trie_t *s = bc_trie_lookup(config->root, section);
if (s == NULL)
return NULL;
return bc_trie_lookup(s, key);
}
const char*
bc_config_get_with_default(bc_config_t *config, const char *section, const char *key,
const char *default_)
{
const char *rv = bc_config_get(config, section, key);
if (rv == NULL)
return default_;
return rv;
}
void
bc_config_free(bc_config_t *config)
{
if (config == NULL)
return;
bc_trie_free(config->root);
free(config);
}
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