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irssi/src/lib-config/parse.c

354 lines
9.2 KiB
C

/*
parse.c : irssi configuration - parse configuration file
Copyright (C) 1999 Timo Sirainen
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "module.h"
static int i_istr_equal(gconstpointer v, gconstpointer v2)
{
return g_ascii_strcasecmp((const char *) v, (const char *) v2) == 0;
}
/* a char* hash function from ASU */
static unsigned int i_istr_hash(gconstpointer v)
{
const char *s = (const char *) v;
unsigned int h = 0, g;
while (*s != '\0') {
h = (h << 4) + i_toupper(*s);
if ((g = h & 0xf0000000UL)) {
h = h ^ (g >> 24);
h = h ^ g;
}
s++;
}
return h /* % M */;
}
int config_error(CONFIG_REC *rec, const char *msg)
{
g_free_and_null(rec->last_error);
rec->last_error = g_strdup(msg);
return -1;
}
static int node_add_comment(CONFIG_NODE *parent, const char *str)
{
CONFIG_NODE *node;
g_return_val_if_fail(parent != NULL, -1);
if (!is_node_list(parent))
return -1;
node = g_new0(CONFIG_NODE, 1);
node->type = NODE_TYPE_COMMENT;
node->value = str == NULL ? NULL : g_strdup(str);
parent->value = g_slist_append(parent->value, node);
return 0;
}
/* same as g_scanner_get_next_token() except skips and reads the comments */
static void config_parse_get_token(GScanner *scanner, CONFIG_NODE *node)
{
int prev_empty = FALSE;
for (;;) {
g_scanner_get_next_token(scanner);
if (scanner->token == G_TOKEN_COMMENT_SINGLE)
node_add_comment(node, scanner->value.v_string);
else if (scanner->token == '\n') {
if (prev_empty) node_add_comment(node, NULL);
} else {
if (scanner->token == G_TOKEN_INT) {
scanner->token = G_TOKEN_STRING;
scanner->value.v_string = g_strdup_printf("%lu", scanner->value.v_int);
}
break;
}
prev_empty = TRUE;
}
}
/* same as g_scanner_peek_next_token() except skips and reads the comments */
static void config_parse_peek_token(GScanner *scanner, CONFIG_NODE *node)
{
int prev_empty = FALSE;
for (;;) {
g_scanner_peek_next_token(scanner);
if (scanner->next_token == G_TOKEN_COMMENT_SINGLE)
node_add_comment(node, scanner->next_value.v_string);
else if (scanner->next_token == '\n') {
if (prev_empty) node_add_comment(node, NULL);
} else
break;
prev_empty = TRUE;
g_scanner_get_next_token(scanner);
}
}
/* get optional token, optionally warn if it's missing */
static void config_parse_warn_missing(CONFIG_REC *rec, CONFIG_NODE *node,
GTokenType expected_token, int print_warning)
{
config_parse_peek_token(rec->scanner, node);
if (rec->scanner->next_token == expected_token) {
g_scanner_get_next_token(rec->scanner);
return;
}
if (print_warning)
g_scanner_warn(rec->scanner, "Warning: missing '%c'", expected_token);
}
static void config_parse_loop(CONFIG_REC *rec, CONFIG_NODE *node, GTokenType expect);
static GTokenType config_parse_symbol(CONFIG_REC *rec, CONFIG_NODE *node)
{
CONFIG_NODE *newnode;
GTokenType last_char;
int print_warning;
char *key;
g_return_val_if_fail(rec != NULL, G_TOKEN_ERROR);
g_return_val_if_fail(node != NULL, G_TOKEN_ERROR);
config_parse_get_token(rec->scanner, node);
last_char = (GTokenType) (node->type == NODE_TYPE_LIST ? ',' : ';');
/* key */
key = NULL;
if (node->type != NODE_TYPE_LIST &&
(rec->scanner->token == G_TOKEN_STRING)) {
key = g_strdup(rec->scanner->value.v_string);
config_parse_warn_missing(rec, node, '=', TRUE);
config_parse_get_token(rec->scanner, node);
}
switch (rec->scanner->token) {
case G_TOKEN_STRING:
/* value */
config_node_set_str(rec, node, key, rec->scanner->value.v_string);
g_free_not_null(key);
print_warning = TRUE;
if (node->type == NODE_TYPE_LIST) {
/* if it's last item it doesn't need comma */
config_parse_peek_token(rec->scanner, node);
if (rec->scanner->next_token == ')')
print_warning = FALSE;
}
config_parse_warn_missing(rec, node, last_char, print_warning);
break;
case '{':
/* block */
if (key == NULL && node->type != NODE_TYPE_LIST) {
g_scanner_error(rec->scanner, "Missing key");
return G_TOKEN_ERROR;
}
newnode = config_node_section(rec, node, key, NODE_TYPE_BLOCK);
config_parse_loop(rec, newnode, (GTokenType) '}');
g_free_not_null(key);
config_parse_get_token(rec->scanner, node);
if (rec->scanner->token != '}')
return (GTokenType) '}';
config_parse_warn_missing(rec, node, last_char, FALSE);
break;
case '(':
/* list */
if (key == NULL && !rec->list_of_lists) {
g_scanner_error(rec->scanner, "List of lists not allowed");
return G_TOKEN_ERROR;
}
newnode = config_node_section(rec, node, key, NODE_TYPE_LIST);
config_parse_loop(rec, newnode, (GTokenType) ')');
g_free_not_null(key);
config_parse_get_token(rec->scanner, node);
if (rec->scanner->token != ')')
return (GTokenType) ')';
config_parse_warn_missing(rec, node, last_char, FALSE);
break;
default:
/* error */
g_free_not_null(key);
return G_TOKEN_STRING;
}
return G_TOKEN_NONE;
}
static void config_parse_loop(CONFIG_REC *rec, CONFIG_NODE *node, GTokenType expect)
{
GTokenType expected_token;
g_return_if_fail(rec != NULL);
g_return_if_fail(node != NULL);
for (;;) {
config_parse_peek_token(rec->scanner, node);
if (rec->scanner->next_token == expect ||
rec->scanner->next_token == G_TOKEN_EOF) break;
expected_token = config_parse_symbol(rec, node);
if (expected_token != G_TOKEN_NONE) {
if (expected_token == G_TOKEN_ERROR)
expected_token = G_TOKEN_NONE;
g_scanner_unexp_token(rec->scanner, expected_token, NULL, "symbol", NULL, NULL, TRUE);
}
}
}
static void config_parse_error_func(GScanner *scanner, char *message, int is_error)
{
CONFIG_REC *rec = scanner->user_data;
char *old;
old = rec->last_error;
rec->last_error = g_strdup_printf("%s%s:%d: %s%s\n",
old == NULL ? "" : old,
scanner->input_name, scanner->line,
is_error ? "error: " : "",
message);
g_free_not_null(old);
}
void config_parse_init(CONFIG_REC *rec, const char *name)
{
GScanner *scanner;
g_free_and_null(rec->last_error);
config_nodes_remove_all(rec);
rec->scanner = scanner = g_scanner_new(NULL);
scanner->config->skip_comment_single = FALSE;
scanner->config->cset_identifier_first = G_CSET_a_2_z"_0123456789"G_CSET_A_2_Z;
scanner->config->cset_skip_characters = " \t";
scanner->config->scan_binary = FALSE;
scanner->config->scan_octal = FALSE;
scanner->config->scan_float = FALSE;
scanner->config->scan_string_sq = TRUE;
scanner->config->scan_string_dq = TRUE;
scanner->config->scan_identifier_1char = TRUE;
scanner->config->identifier_2_string = TRUE;
scanner->user_data = rec;
scanner->input_name = name;
scanner->msg_handler = (GScannerMsgFunc) config_parse_error_func;
}
int config_parse(CONFIG_REC *rec)
{
int fd;
g_return_val_if_fail(rec != NULL, -1);
g_return_val_if_fail(rec->fname != NULL, -1);
fd = open(rec->fname, O_RDONLY);
if (fd == -1)
return config_error(rec, g_strerror(errno));
config_parse_init(rec, rec->fname);
g_scanner_input_file(rec->scanner, fd);
config_parse_loop(rec, rec->mainnode, G_TOKEN_EOF);
g_scanner_destroy(rec->scanner);
close(fd);
return rec->last_error == NULL ? 0 : -1;
}
int config_parse_data(CONFIG_REC *rec, const char *data, const char *input_name)
{
config_parse_init(rec, input_name);
g_scanner_input_text(rec->scanner, data, strlen(data));
config_parse_loop(rec, rec->mainnode, G_TOKEN_EOF);
g_scanner_destroy(rec->scanner);
return rec->last_error == NULL ? 0 : -1;
}
CONFIG_REC *config_open(const char *fname, int create_mode)
{
CONFIG_REC *rec;
int f;
if (fname != NULL) {
f = open(fname, O_RDONLY | (create_mode != -1 ? O_CREAT : 0), create_mode);
if (f == -1) return NULL;
close(f);
}
rec = g_new0(CONFIG_REC, 1);
rec->fname = fname == NULL ? NULL : g_strdup(fname);
rec->create_mode = create_mode;
rec->mainnode = g_new0(CONFIG_NODE, 1);
rec->mainnode->type = NODE_TYPE_BLOCK;
rec->cache = g_hash_table_new((GHashFunc) i_istr_hash, (GCompareFunc) i_istr_equal);
rec->cache_nodes = g_hash_table_new((GHashFunc) g_direct_hash, (GCompareFunc) g_direct_equal);
return rec;
}
void config_close(CONFIG_REC *rec)
{
g_return_if_fail(rec != NULL);
config_nodes_remove_all(rec);
g_free(rec->mainnode);
g_hash_table_foreach(rec->cache, (GHFunc) g_free, NULL);
g_hash_table_destroy(rec->cache);
g_hash_table_destroy(rec->cache_nodes);
g_free_not_null(rec->last_error);
g_free_not_null(rec->fname);
g_free(rec);
}
void config_change_file_name(CONFIG_REC *rec, const char *fname, int create_mode)
{
g_return_if_fail(rec != NULL);
g_return_if_fail(fname != NULL);
g_free_not_null(rec->fname);
rec->fname = g_strdup(fname);
if (create_mode != -1)
rec->create_mode = create_mode;
}