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weechat/src/core/wee-eval.c
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/*
* wee-eval.c - evaluate expressions with references to internal vars
*
* Copyright (C) 2012-2021 Sébastien Helleu <flashcode@flashtux.org>
*
* This file is part of WeeChat, the extensible chat client.
*
* WeeChat 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 3 of the License, or
* (at your option) any later version.
*
* WeeChat 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 WeeChat. If not, see <https://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <regex.h>
#include <time.h>
#include "weechat.h"
#include "wee-eval.h"
#include "wee-calc.h"
#include "wee-config-file.h"
#include "wee-hashtable.h"
#include "wee-hdata.h"
#include "wee-hook.h"
#include "wee-secure.h"
#include "wee-string.h"
#include "wee-utf8.h"
#include "../gui/gui-buffer.h"
#include "../gui/gui-chat.h"
#include "../gui/gui-color.h"
#include "../gui/gui-window.h"
#include "../plugins/plugin.h"
#define EVAL_DEBUG_MSG(level, msg, argz...) \
debug_id = -1; \
if (eval_context->debug_level >= level) \
{ \
debug_id = ++(eval_context->debug_id); \
(eval_context->debug_depth)++; \
eval_debug_message_vargs (eval_context, debug_id, msg, ##argz); \
}
#define EVAL_DEBUG_RESULT(level, result) \
if (eval_context->debug_level >= level) \
{ \
eval_debug_message (eval_context, debug_id, 1, result); \
(eval_context->debug_depth)--; \
}
char *logical_ops[EVAL_NUM_LOGICAL_OPS] =
{ "||", "&&" };
char *comparisons[EVAL_NUM_COMPARISONS] =
{ "=~", "!~", /* regex */
"==*", "!!*", "=*", "!*", /* string match */
"==-", "!!-", "=-", "!-", /* includes */
"==", "!=", /* equal, not equal */
"<=", "<", ">=", ">", /* less than, greater than */
};
char *eval_replace_vars (const char *expr,
struct t_eval_context *eval_context);
char *eval_expression_condition (const char *expr,
struct t_eval_context *eval_context);
/*
* Adds a debug message in the debug output.
*/
void
eval_debug_message (struct t_eval_context *eval_context, int debug_id,
int result, const char *message)
{
int i;
char str_id[64];
if (*(eval_context->debug_output)[0])
string_dyn_concat (eval_context->debug_output, "\n", -1);
/* indentation */
for (i = 1; i < eval_context->debug_depth; i++)
{
string_dyn_concat (eval_context->debug_output, " ", -1);
}
/* debug id */
if (debug_id >= 0)
{
snprintf (str_id, sizeof (str_id), "%d:", debug_id);
string_dyn_concat (eval_context->debug_output, str_id, -1);
}
/* debug message */
if (result)
{
string_dyn_concat (eval_context->debug_output, "== ", -1);
if (message)
string_dyn_concat (eval_context->debug_output, "\"", -1);
string_dyn_concat (eval_context->debug_output,
(message) ? message : "null",
-1);
if (message)
string_dyn_concat (eval_context->debug_output, "\"", -1);
}
else
{
string_dyn_concat (eval_context->debug_output, message, -1);
}
}
/*
* Adds a debug message in the debug output, with variable arguments.
*/
void
eval_debug_message_vargs (struct t_eval_context *eval_context, int debug_id,
const char *message, ...)
{
weechat_va_format (message);
if (vbuffer)
{
eval_debug_message (eval_context, debug_id, 0,
vbuffer);
free (vbuffer);
}
}
/*
* Checks if a value is true: a value is true if string is non-NULL, non-empty
* and different from "0".
*
* Returns:
* 1: value is true
* 0: value is false
*/
int
eval_is_true (const char *value)
{
return (value && value[0] && (strcmp (value, "0") != 0)) ? 1 : 0;
}
/*
* Searches a string in another at same level (skip sub-expressions between
* prefix/suffix).
*
* If escape is 1, the prefix can be escaped with '\' (and then is ignored).
*
* For example:
* eval_strstr_level ("(x || y) || z", "||", eval_context, "(", ")", 0)
* will return a pointer on "|| z" (because the first "||" is
* in a sub-expression, which is skipped).
*
* Returns pointer to string found, or NULL if not found.
*/
const char *
eval_strstr_level (const char *string, const char *search,
struct t_eval_context *eval_context,
const char *extra_prefix, const char *extra_suffix,
int escape)
{
const char *ptr_string;
int level, length_search, debug_id;
int length_prefix, length_prefix2, length_suffix, length_suffix2;
ptr_string = NULL;
EVAL_DEBUG_MSG(2, "eval_strstr_level(\"%s\", \"%s\", \"%s\", \"%s\", %d)",
string, search, extra_prefix, extra_suffix, escape);
if (!string || !search)
{
ptr_string = NULL;
goto end;
}
length_search = strlen (search);
length_prefix = strlen (eval_context->prefix);
length_suffix = strlen (eval_context->suffix);
length_prefix2 = (extra_prefix) ? strlen (extra_prefix) : 0;
length_suffix2 = (extra_suffix) ? strlen (extra_suffix) : 0;
ptr_string = string;
level = 0;
while (ptr_string[0])
{
if (escape
&& (ptr_string[0] == '\\')
&& ((ptr_string[1] == eval_context->prefix[0])
|| ((length_suffix2 > 0) && ptr_string[1] == extra_prefix[0])))
{
ptr_string++;
}
else if (strncmp (ptr_string, eval_context->prefix, length_prefix) == 0)
{
level++;
ptr_string += length_prefix;
}
else if ((length_prefix2 > 0)
&& (strncmp (ptr_string, extra_prefix, length_prefix2) == 0))
{
level++;
ptr_string += length_prefix2;
}
else if (strncmp (ptr_string, eval_context->suffix, length_suffix) == 0)
{
if (level > 0)
level--;
ptr_string += length_suffix;
}
else if ((length_suffix2 > 0)
&& (strncmp (ptr_string, extra_suffix, length_suffix2) == 0))
{
if (level > 0)
level--;
ptr_string += length_suffix2;
}
else if ((level == 0)
&& (strncmp (ptr_string, search, length_search) == 0))
{
goto end;
}
else
{
ptr_string++;
}
}
ptr_string = NULL;
end:
EVAL_DEBUG_RESULT(2, ptr_string);
return ptr_string;
}
/*
* Evaluates a condition and returns boolean result:
* "0" if false
* "1" if true
*
* Note: result must be freed after use.
*/
char *
eval_string_eval_cond (const char *text, struct t_eval_context *eval_context)
{
char *tmp;
int rc;
tmp = eval_expression_condition (text, eval_context);
rc = eval_is_true (tmp);
if (tmp)
free (tmp);
return strdup ((rc) ? EVAL_STR_TRUE : EVAL_STR_FALSE);
}
/*
* Hides chars in a string.
*
* Note: result must be freed after use.
*/
char *
eval_string_hide (const char *text)
{
const char *ptr_string;
char *hidden_string, *hide_char;
int i, j, length, length_hide_char;
hidden_string = NULL;
ptr_string = strchr (text, (text[0] == ',') ? ';' : ',');
if (!ptr_string)
return strdup ("");
hide_char = string_strndup (text, ptr_string - text);
if (hide_char)
{
length_hide_char = strlen (hide_char);
length = utf8_strlen (ptr_string + 1);
hidden_string = malloc ((length * length_hide_char) + 1);
if (hidden_string)
{
j = 0;
for (i = 0; i < length; i++)
{
memcpy (hidden_string + j, hide_char, length_hide_char);
j += length_hide_char;
}
hidden_string[length * length_hide_char] = '\0';
}
free (hide_char);
}
return (hidden_string) ? hidden_string : strdup ("");
}
/*
* Cuts string.
*
* Note: result must be freed after use.
*/
char *
eval_string_cut (const char *text, int screen)
{
const char *pos, *pos2;
char *tmp, *error, *value;
int count_suffix;
long number;
count_suffix = 0;
if (text[0] == '+')
{
text++;
count_suffix = 1;
}
pos = strchr (text, ',');
if (!pos)
return strdup ("");
pos2 = strchr (pos + 1, ',');
if (!pos2)
return strdup ("");
tmp = strndup (text, pos - text);
if (!tmp)
return strdup ("");
number = strtol (tmp, &error, 10);
if (!error || error[0] || (number < 0))
{
free (tmp);
return strdup ("");
}
free (tmp);
tmp = strndup (pos + 1, pos2 - pos - 1);
if (!tmp)
return strdup ("");
value = string_cut (pos2 + 1, number, count_suffix, screen, tmp);
free (tmp);
return value;
}
/*
* Repeats string.
*
* Note: result must be freed after use.
*/
char *
eval_string_repeat (const char *text)
{
const char *pos;
char *tmp, *error;
long number;
pos = strchr (text, ',');
if (!pos)
return strdup ("");
tmp = strndup (text, pos - text);
if (!tmp)
return strdup ("");
number = strtol (tmp, &error, 10);
if (!error || error[0] || (number < 0))
{
free (tmp);
return strdup ("");
}
free (tmp);
return string_repeat (pos + 1, number);
}
/*
* Splits string.
*
* Format: number,separators,flags,string
*
* If number == "count", returns the number of items after split.
* If number == "random", returns a random item.
* If number > 0, return this index (empty string if not enough items).
* If number < 0, return this index starting from the end (-1 = last item,
* -2 = penultimate item, etc.).
*
* If separators is empty string, a comma is used by default.
*
* Flags is a list of flags, separated by "+":
* strip_left
* strip_right
* collapse_seps
* keep_eol
* strip_items=xyz
* max_items=N
*
* Examples:
* ${split:1,,,abc,def,ghi} ==> abc
* ${split:-1,,,abc,def,ghi} ==> ghi
* ${split:count,,,abc,def,ghi} ==> 3
* ${split:random,,,abc,def,ghi} ==> def
* ${split:3,,collapse_seps,abc,,,def,,,ghi} ==> ghi
* ${split:3,,strip_items=-_,_-abc-_,_-def-_,_-ghi-_} ==> ghi
* ${split:2, ,,this is a test} ==> is
* ${split:2, ,strip_left+strip_right, this is a test } ==> is
* ${split:2, ,keep_eol,this is a test} ==> is a test
*
* Note: result must be freed after use.
*/
char *
eval_string_split (const char *text)
{
char *pos, *pos2, *pos3, *str_number, *separators, **items, *value, *error;
char str_value[32], *str_flags, **list_flags, *strip_items;
int i, num_items, count_items, random_item, flags;
long number, max_items;
str_number = NULL;
separators = NULL;
items = NULL;
value = NULL;
str_flags = NULL;
list_flags = NULL;
strip_items = NULL;
count_items = 0;
random_item = 0;
flags = 0;
max_items = 0;
if (!text || !text[0])
goto end;
pos = strchr (text, ',');
if (!pos || (pos == text))
goto end;
number = 0;
str_number = string_strndup (text, pos - text);
if (strcmp (str_number, "count") == 0)
{
count_items = 1;
}
else if (strcmp (str_number, "random") == 0)
{
random_item = 1;
}
else
{
number = strtol (str_number, &error, 10);
if (!error || error[0] || (number == 0))
goto end;
}
pos++;
pos2 = strchr (pos, ',');
if (!pos2)
goto end;
if (pos2 == pos)
separators = strdup (",");
else
separators = string_strndup (pos, pos2 - pos);
pos2++;
pos3 = strchr (pos2, ',');
if (!pos3)
goto end;
str_flags = string_strndup (pos2, pos3 - pos2);
list_flags = string_split (str_flags, "+", NULL, 0, 0, NULL);
if (list_flags)
{
for (i = 0; list_flags[i]; i++)
{
if (strcmp (list_flags[i], "strip_left") == 0)
flags |= WEECHAT_STRING_SPLIT_STRIP_LEFT;
else if (strcmp (list_flags[i], "strip_right") == 0)
flags |= WEECHAT_STRING_SPLIT_STRIP_RIGHT;
else if (strcmp (list_flags[i], "collapse_seps") == 0)
flags |= WEECHAT_STRING_SPLIT_COLLAPSE_SEPS;
else if (strcmp (list_flags[i], "keep_eol") == 0)
flags |= WEECHAT_STRING_SPLIT_KEEP_EOL;
else if (strncmp (list_flags[i], "strip_items=", 12) == 0)
strip_items = strdup (list_flags[i] + 12);
else if (strncmp (list_flags[i], "max_items=", 10) == 0)
{
max_items = strtol (list_flags[i] + 10, &error, 10);
if (!error || error[0] || (max_items < 0))
goto end;
}
}
}
pos3++;
items = string_split (pos3, separators, strip_items, flags,
max_items, &num_items);
/* if "count" was asked, return the number of items found after split */
if (count_items)
{
snprintf (str_value, sizeof (str_value), "%d", num_items);
value = strdup (str_value);
goto end;
}
if (!items || (num_items < 1))
goto end;
/* if "random" was asked, return a random item */
if (random_item)
number = random () % num_items;
else if (number > 0)
number--;
if (((number >= 0) && (number >= num_items))
|| ((number < 0) && (labs (number) > num_items)))
{
goto end;
}
if (number < 0)
number = num_items + number;
value = strdup (items[number]);
end:
if (str_number)
free (str_number);
if (separators)
free (separators);
if (str_flags)
free (str_flags);
if (list_flags)
string_free_split (list_flags);
if (strip_items)
free (strip_items);
if (items)
string_free_split (items);
return (value) ? value : strdup ("");
}
/*
* Splits shell arguments.
*
* Format: number,string
*
* If number == "count", returns the number of arguments.
* If number == "random", returns a random argument.
* If number > 0, return this index (empty string if not enough arguments).
* If number < 0, return this index starting from the end (-1 = last argument,
* -2 = penultimate argument, etc.).
*
* Examples:
* ${split_shell:count,"arg 1" arg2} ==> "2"
* ${split_shell:random,"arg 1" arg2} ==> "arg2"
* ${split_shell:1,"arg 1" arg2} ==> "arg 1"
* ${split_shell:-1,"arg 1" arg2} ==> "arg2"
*
* Note: result must be freed after use.
*/
char *
eval_string_split_shell (const char *text)
{
char *pos, *str_number, **items, *value, *error, str_value[32];
int num_items, count_items, random_item;
long number;
str_number = NULL;
items = NULL;
value = NULL;
count_items = 0;
random_item = 0;
if (!text || !text[0])
goto end;
pos = strchr (text, ',');
if (!pos || (pos == text))
goto end;
number = 0;
str_number = string_strndup (text, pos - text);
if (strcmp (str_number, "count") == 0)
{
count_items = 1;
}
else if (strcmp (str_number, "random") == 0)
{
random_item = 1;
}
else
{
number = strtol (str_number, &error, 10);
if (!error || error[0] || (number == 0))
goto end;
}
pos++;
items = string_split_shell (pos, &num_items);
/* if "count" was asked, return the number of items found after split */
if (count_items)
{
snprintf (str_value, sizeof (str_value), "%d", num_items);
value = strdup (str_value);
goto end;
}
if (!items || (num_items < 1))
goto end;
/* if "random" was asked, return a random item */
if (random_item)
number = random () % num_items;
else if (number > 0)
number--;
if (((number >= 0) && (number >= num_items))
|| ((number < 0) && (labs (number) > num_items)))
{
goto end;
}
if (number < 0)
number = num_items + number;
value = strdup (items[number]);
end:
if (str_number)
free (str_number);
if (items)
string_free_split (items);
return (value) ? value : strdup ("");
}
/*
* Returns a regex group captured.
*
* Note: result must be freed after use.
*/
char *
eval_string_regex_group (const char *text, struct t_eval_context *eval_context)
{
char str_value[64], *error;
long number;
if (!eval_context->regex || !eval_context->regex->result)
return strdup ("");
if (strcmp (text, "#") == 0)
{
snprintf (str_value, sizeof (str_value),
"%d", eval_context->regex->last_match);
return strdup (str_value);
}
if (strcmp (text, "repl_index") == 0)
{
snprintf (str_value, sizeof (str_value),
"%d", eval_context->regex_replacement_index);
return strdup (str_value);
}
if (strcmp (text, "+") == 0)
{
number = eval_context->regex->last_match;
}
else
{
number = strtol (text, &error, 10);
if (!error || error[0])
number = -1;
}
if ((number >= 0) && (number <= eval_context->regex->last_match))
{
return string_strndup (
eval_context->regex->result +
eval_context->regex->match[number].rm_so,
eval_context->regex->match[number].rm_eo -
eval_context->regex->match[number].rm_so);
}
return strdup ("");
}
/*
* Returns a string with color code.
*
* Note: result must be freed after use.
*/
char *
eval_string_color (const char *text)
{
const char *ptr_value;
ptr_value = gui_color_search_config (text);
if (ptr_value)
return strdup (ptr_value);
ptr_value = gui_color_get_custom (text);
return strdup ((ptr_value) ? ptr_value : "");
}
/*
* Returns a string modified by a modifier.
*
* Note: result must be freed after use.
*/
char *
eval_string_modifier (const char *text)
{
const char *ptr_arguments, *ptr_string;
char *value, *modifier_name, *modifier_data;
value = NULL;
ptr_arguments = strchr (text, ',');
if (!ptr_arguments)
return strdup ("");
ptr_arguments++;
ptr_string = strchr (ptr_arguments, ',');
if (!ptr_string)
return strdup ("");
ptr_string++;
modifier_name = string_strndup (text, ptr_arguments - 1 - text);
modifier_data = string_strndup (ptr_arguments,
ptr_string - 1 - ptr_arguments);
value = hook_modifier_exec (NULL, modifier_name, modifier_data,
ptr_string);
if (modifier_name)
free (modifier_name);
if (modifier_data)
free (modifier_data);
return (value) ? value : strdup ("");
}
/*
* Returns an info.
*
* Note: result must be freed after use.
*/
char *
eval_string_info (const char *text)
{
const char *ptr_arguments;
char *value, *info_name;
value = NULL;
ptr_arguments = strchr (text, ',');
if (ptr_arguments)
{
info_name = string_strndup (text, ptr_arguments - text);
ptr_arguments++;
}
else
{
info_name = strdup (text);
}
if (info_name)
{
value = hook_info_get (NULL, info_name, ptr_arguments);
free (info_name);
}
return (value) ? value : strdup ("");
}
/*
* Encodes a string in base 16, 32, or 64.
*
* Note: result must be freed after use.
*/
char *
eval_string_base_encode (const char *text)
{
const char *ptr_string;
char *value, *base, *error, *result;
long number;
int length;
base = NULL;
result = NULL;
ptr_string = strchr (text, ',');
if (!ptr_string)
goto end;
base = string_strndup (text, ptr_string - text);
if (!base)
goto end;
number = strtol (base, &error, 10);
if (!error || error[0])
goto end;
ptr_string++;
length = strlen (ptr_string);
result = malloc ((length * 4) + 1);
if (!result)
goto end;
if (string_base_encode (number, ptr_string, length, result) < 0)
{
free (result);
result = NULL;
}
end:
value = strdup ((result) ? result : "");
if (base)
free (base);
if (result)
free (result);
return value;
}
/*
* Decodes a string encoded in base 16, 32, or 64.
*
* Note: result must be freed after use.
*/
char *
eval_string_base_decode (const char *text)
{
const char *ptr_string;
char *value, *base, *error, *result;
long number;
base = NULL;
result = NULL;
ptr_string = strchr (text, ',');
if (!ptr_string)
goto end;
base = string_strndup (text, ptr_string - text);
if (!base)
goto end;
number = strtol (base, &error, 10);
if (!error || error[0])
goto end;
ptr_string++;
result = malloc (strlen (ptr_string) + 1);
if (!result)
goto end;
if (string_base_decode (number, ptr_string, result) < 0)
{
free (result);
result = NULL;
}
end:
value = strdup ((result) ? result : "");
if (base)
free (base);
if (result)
free (result);
return value;
}
/*
* Returns a date.
*
* Note: result must be freed after use.
*/
char *
eval_string_date (const char *text)
{
char str_value[512];
time_t date;
struct tm *date_tmp;
int rc;
date = time (NULL);
date_tmp = localtime (&date);
if (!date_tmp)
return strdup ("");
rc = (int) strftime (str_value, sizeof (str_value),
(text[0] == ':') ? text + 1 : "%F %T",
date_tmp);
return strdup ((rc > 0) ? str_value : "");
}
/*
* Evaluates a condition and returns evaluated if/else clause.
*
* Note: result must be freed after use.
*/
char *
eval_string_if (const char *text, struct t_eval_context *eval_context)
{
const char *pos, *pos2;
char *value, *condition, *tmp;
int rc;
value = NULL;
pos = (char *)eval_strstr_level (text, "?",
eval_context, NULL, NULL, 1);
pos2 = (pos) ?
(char *)eval_strstr_level (pos + 1, ":",
eval_context, NULL, NULL, 1) : NULL;
condition = (pos) ?
strndup (text, pos - text) : strdup (text);
if (!condition)
return strdup ("");
tmp = eval_expression_condition (condition, eval_context);
rc = eval_is_true (tmp);
if (tmp)
free (tmp);
if (rc)
{
/*
* condition is true: return the "value_if_true"
* (or EVAL_STR_TRUE if value is missing)
*/
if (pos)
{
tmp = (pos2) ?
strndup (pos + 1, pos2 - pos - 1) : strdup (pos + 1);
if (tmp)
{
value = eval_replace_vars (tmp, eval_context);
free (tmp);
}
}
else
{
value = strdup (EVAL_STR_TRUE);
}
}
else
{
/*
* condition is false: return the "value_if_false"
* (or EVAL_STR_FALSE if both values are missing)
*/
if (pos2)
{
value = eval_replace_vars (pos2 + 1, eval_context);
}
else
{
if (!pos)
value = strdup (EVAL_STR_FALSE);
}
}
free (condition);
return (value) ? value : strdup ("");
}
/*
* Returns a random integer number.
*
* Note: result must be freed after use.
*/
char *
eval_string_random (const char *text)
{
char *pos, *error, *tmp, result[128];
long min_number, max_number;
if (!text || !text[0])
goto error;
pos = strchr (text, ',');
if (!pos)
goto error;
tmp = strndup (text, pos - text);
if (!tmp)
goto error;
min_number = strtol (tmp, &error, 10);
if (!error || error[0])
{
free (tmp);
goto error;
}
free (tmp);
max_number = strtol (pos + 1, &error, 10);
if (!error || error[0])
goto error;
if (min_number > max_number)
goto error;
if (max_number - min_number > RAND_MAX)
goto error;
/*
* using modulo division on the random() value produces a biased result,
* but this is enough for our usage here
*/
snprintf (result, sizeof (result),
"%ld", min_number + (random () % (max_number - min_number + 1)));
return strdup (result);
error:
return strdup ("0");
}
/*
* Translates text.
*
* Note: result must be freed after use.
*/
char *
eval_string_translate (const char *text)
{
const char *ptr_string;
if (!text || !text[0])
return strdup ("");
ptr_string = gettext (text);
return strdup ((ptr_string) ? ptr_string : "");
}
/*
* Defines a variable.
*/
void
eval_string_define (const char *text, struct t_eval_context *eval_context)
{
char *pos, *name;
pos = strchr (text, ',');
if (!pos)
return;
name = strndup (text, pos - text);
if (!name)
return;
hashtable_set (eval_context->user_vars, name, pos + 1);
free (name);
}
/*
* Gets value of hdata using "path" to a variable.
*
* Note: result must be freed after use.
*/
char *
eval_hdata_get_value (struct t_hdata *hdata, void *pointer, const char *path,
struct t_eval_context *eval_context)
{
char *value, *old_value, *var_name, str_value[128], *pos;
const char *ptr_value, *hdata_name, *ptr_var_name;
int type, debug_id;
struct t_hashtable *hashtable;
EVAL_DEBUG_MSG(1, "eval_hdata_get_value(\"%s\", 0x%lx, \"%s\")",
(hdata) ? hdata->name : "(null)",
pointer,
path);
value = NULL;
var_name = NULL;
/* NULL pointer? return empty string */
if (!pointer)
{
value = strdup ("");
goto end;
}
/* no path? just return current pointer as string */
if (!path || !path[0])
{
snprintf (str_value, sizeof (str_value),
"0x%lx", (unsigned long)pointer);
value = strdup (str_value);
goto end;
}
if (!hdata)
goto end;
/*
* look for name of hdata, for example in "window.buffer.full_name", the
* hdata name is "window"
*/
pos = strchr (path, '.');
if (pos > path)
var_name = string_strndup (path, pos - path);
else
var_name = strdup (path);
if (!var_name)
goto end;
/* search type of variable in hdata */
hdata_get_index_and_name (var_name, NULL, &ptr_var_name);
type = hdata_get_var_type (hdata, ptr_var_name);
if (type < 0)
goto end;
/* build a string with the value or variable */
switch (type)
{
case WEECHAT_HDATA_CHAR:
snprintf (str_value, sizeof (str_value),
"%c", hdata_char (hdata, pointer, var_name));
value = strdup (str_value);
break;
case WEECHAT_HDATA_INTEGER:
snprintf (str_value, sizeof (str_value),
"%d", hdata_integer (hdata, pointer, var_name));
value = strdup (str_value);
break;
case WEECHAT_HDATA_LONG:
snprintf (str_value, sizeof (str_value),
"%ld", hdata_long (hdata, pointer, var_name));
value = strdup (str_value);
break;
case WEECHAT_HDATA_STRING:
case WEECHAT_HDATA_SHARED_STRING:
ptr_value = hdata_string (hdata, pointer, var_name);
value = (ptr_value) ? strdup (ptr_value) : NULL;
break;
case WEECHAT_HDATA_POINTER:
pointer = hdata_pointer (hdata, pointer, var_name);
snprintf (str_value, sizeof (str_value),
"0x%lx", (unsigned long)pointer);
value = strdup (str_value);
break;
case WEECHAT_HDATA_TIME:
snprintf (str_value, sizeof (str_value),
"%lld", (long long)hdata_time (hdata, pointer, var_name));
value = strdup (str_value);
break;
case WEECHAT_HDATA_HASHTABLE:
pointer = hdata_hashtable (hdata, pointer, var_name);
if (pos)
{
/*
* for a hashtable, if there is a "." after name of hdata,
* get the value for this key in hashtable
*/
hashtable = pointer;
ptr_value = hashtable_get (hashtable, pos + 1);
if (ptr_value)
{
switch (hashtable->type_values)
{
case HASHTABLE_INTEGER:
snprintf (str_value, sizeof (str_value),
"%d", *((int *)ptr_value));
value = strdup (str_value);
break;
case HASHTABLE_STRING:
value = strdup (ptr_value);
break;
case HASHTABLE_POINTER:
case HASHTABLE_BUFFER:
snprintf (str_value, sizeof (str_value),
"0x%lx", (unsigned long)ptr_value);
value = strdup (str_value);
break;
case HASHTABLE_TIME:
snprintf (str_value, sizeof (str_value),
"%lld", (long long)(*((time_t *)ptr_value)));
value = strdup (str_value);
break;
case HASHTABLE_NUM_TYPES:
break;
}
}
}
else
{
snprintf (str_value, sizeof (str_value),
"0x%lx", (unsigned long)pointer);
value = strdup (str_value);
}
break;
}
/*
* if we are on a pointer and that something else is in path (after "."),
* go on with this pointer and remaining path
*/
if ((type == WEECHAT_HDATA_POINTER) && pos)
{
hdata_name = hdata_get_var_hdata (hdata, var_name);
if (!hdata_name)
goto end;
hdata = hook_hdata_get (NULL, hdata_name);
old_value = value;
value = eval_hdata_get_value (hdata,
pointer,
(pos) ? pos + 1 : NULL,
eval_context);
if (old_value)
free (old_value);
}
end:
if (var_name)
free (var_name);
EVAL_DEBUG_RESULT(1, value);
return value;
}
/*
* Returns a string using hdata.
*
* Note: result must be freed after use.
*/
char *
eval_string_hdata (const char *text, struct t_eval_context *eval_context)
{
const char *pos_vars, *pos1, *pos2;
char *value, *hdata_name, *pointer_name, *tmp;
void *pointer;
struct t_hdata *hdata;
int rc;
unsigned long ptr;
value = NULL;
hdata_name = NULL;
pointer_name = NULL;
pointer = NULL;
pos_vars = strchr (text, '.');
if (pos_vars > text)
hdata_name = string_strndup (text, pos_vars - text);
else
hdata_name = strdup (text);
if (pos_vars)
pos_vars++;
if (!hdata_name)
goto end;
pos1 = strchr (hdata_name, '[');
if (pos1 > hdata_name)
{
pos2 = strchr (pos1 + 1, ']');
if (pos2)
{
if (pos2 > pos1 + 1)
pointer_name = string_strndup (pos1 + 1, pos2 - pos1 - 1);
else
goto end;
}
tmp = string_strndup (hdata_name, pos1 - hdata_name);
if (tmp)
{
free (hdata_name);
hdata_name = tmp;
}
}
hdata = hook_hdata_get (NULL, hdata_name);
if (!hdata)
{
if (pos_vars || pointer_name)
goto end;
/* case of a single pointer which is not hdata, eg: ${my_pointer} */
pointer = hashtable_get (eval_context->pointers, hdata_name);
value = eval_hdata_get_value (NULL, pointer, pos_vars, eval_context);
goto end;
}
if (pointer_name)
{
if (strncmp (pointer_name, "0x", 2) == 0)
{
rc = sscanf (pointer_name, "%lx", &ptr);
if ((rc != EOF) && (rc != 0))
{
pointer = (void *)ptr;
if (!hdata_check_pointer (hdata, NULL, pointer))
goto end;
}
else
goto end;
}
else
{
pointer = hdata_get_list (hdata, pointer_name);
if (!pointer)
{
pointer = hashtable_get (eval_context->pointers, pointer_name);
if (!pointer)
goto end;
if (!hdata_check_pointer (hdata, NULL, pointer))
goto end;
}
}
}
if (!pointer)
{
pointer = hashtable_get (eval_context->pointers, hdata_name);
if (!pointer)
goto end;
if (!hdata_check_pointer (hdata, NULL, pointer))
goto end;
}
value = eval_hdata_get_value (hdata, pointer, pos_vars, eval_context);
end:
if (hdata_name)
free (hdata_name);
if (pointer_name)
free (pointer_name);
return (value) ? value : strdup ("");
}
/*
* Replaces variables, which can be, by order of priority:
* 1. the string itself without evaluation (format: raw:xxx)
* 2. a variable from hashtable "user_vars" or "extra_vars"
* 3. a WeeChat home directory, one of: "weechat_config_dir",
* "weechat_data_dir", "weechat_cache_dir", "weechat_runtime_dir"
* 4. a string to evaluate (format: eval:xxx)
* 5. a condition to evaluate (format: eval_cond:xxx)
* 6. a string with escaped chars (format: esc:xxx or \xxx)
* 7. a string with chars to hide (format: hide:char,string)
* 8. a string with max chars (format: cut:max,suffix,string or
* cut:+max,suffix,string) or max chars on screen
* (format: cutscr:max,suffix,string or cutscr:+max,suffix,string)
* 9. a reversed string (format: rev:xxx) or reversed string for screen,
* color codes are not reversed (format: revscr:xxx)
* 10. a repeated string (format: repeat:count,string)
* 11. length of a string (format: length:xxx) or length of a string on screen
* (format: lengthscr:xxx); color codes are ignored
* 12. split string (format: split:number,separators,flags,xxx
* or split:count,separators,flags,xxx
* or split:random,separators,flags,xxx)
* 13. split shell arguments (format: split:number,xxx or split:count,xxx
* or split:random,xxx)
* 14. a regex group captured (format: re:N (0.99) or re:+)
* 15. a color (format: color:xxx)
* 16. a modifier (format: modifier:name,data,xxx)
* 17. an info (format: info:name,arguments)
* 18. a base 16/32/64 encoded/decoded string (format: base_encode:base,xxx
* or base_decode:base,xxx)
* 19. current date/time (format: date or date:xxx)
* 20. an environment variable (format: env:XXX)
* 21. a ternary operator (format: if:condition?value_if_true:value_if_false)
* 22. calculate result of an expression (format: calc:xxx)
* 23. a random integer number in the range from "min" to "max"
* (format: random:min,max)
* 24. a translated string (format: translate:xxx)
* 25. an option (format: file.section.option)
* 26. a buffer local variable
* 27. a pointer name from hashtable "pointers"
* 28. a hdata variable (format: hdata.var1.var2 or hdata[list].var1.var2
* or hdata[ptr].var1.var2 or hdata[ptr_name].var1.var2)
*
* See /help in WeeChat for examples.
*
* Note: result must be freed after use.
*/
char *
eval_replace_vars_cb (void *data, const char *text)
{
struct t_eval_context *eval_context;
struct t_config_option *ptr_option;
struct t_gui_buffer *ptr_buffer;
char str_value[512], *value, *tmp;
const char *ptr_value;
int length, debug_id;
value = NULL;
eval_context = (struct t_eval_context *)data;
EVAL_DEBUG_MSG(1, "eval_replace_vars_cb(\"%s\")", text);
/*
* 1. raw text (no evaluation at all)
*/
if (strncmp (text, "raw:", 4) == 0)
{
value = strdup (text + 4);
goto end;
}
/* 2. variable in hashtable "user_vars" or "extra_vars" */
ptr_value = hashtable_get (eval_context->user_vars, text);
if (ptr_value)
{
value = strdup (ptr_value);
goto end;
}
if (eval_context->extra_vars)
{
ptr_value = hashtable_get (eval_context->extra_vars, text);
if (ptr_value)
{
if (eval_context->extra_vars_eval)
{
tmp = strdup (ptr_value);
if (!tmp)
goto end;
hashtable_remove (eval_context->extra_vars, text);
value = eval_replace_vars (tmp, eval_context);
hashtable_set (eval_context->extra_vars, text, tmp);
free (tmp);
goto end;
}
else
{
value = strdup (ptr_value);
goto end;
}
}
}
/* 3. WeeChat home directory */
if (strcmp (text, "weechat_config_dir") == 0)
{
value = strdup (weechat_config_dir);
goto end;
}
if (strcmp (text, "weechat_data_dir") == 0)
{
value = strdup (weechat_data_dir);
goto end;
}
if (strcmp (text, "weechat_cache_dir") == 0)
{
value = strdup (weechat_cache_dir);
goto end;
}
if (strcmp (text, "weechat_runtime_dir") == 0)
{
value = strdup (weechat_runtime_dir);
goto end;
}
/*
* 4. force evaluation of string (recursive call)
* --> use with caution: the text must be safe!
*/
if (strncmp (text, "eval:", 5) == 0)
{
value = eval_replace_vars (text + 5, eval_context);
goto end;
}
/*
* 5. force evaluation of condition (recursive call)
* --> use with caution: the text must be safe!
*/
if (strncmp (text, "eval_cond:", 10) == 0)
{
value = eval_string_eval_cond (text + 10, eval_context);
goto end;
}
/* 6. convert escaped chars */
if (strncmp (text, "esc:", 4) == 0)
{
value = string_convert_escaped_chars (text + 4);
goto end;
}
if ((text[0] == '\\') && text[1] && (text[1] != '\\'))
{
value = string_convert_escaped_chars (text);
goto end;
}
/* 7. hide chars: replace all chars by a given char/string */
if (strncmp (text, "hide:", 5) == 0)
{
value = eval_string_hide (text + 5);
goto end;
}
/*
* 8. cut chars:
* cut: max number of chars, and add an optional suffix when the
* string is cut
* cutscr: max number of chars displayed on screen, and add an optional
* suffix when the string is cut
*/
if (strncmp (text, "cut:", 4) == 0)
{
value = eval_string_cut (text + 4, 0);
goto end;
}
if (strncmp (text, "cutscr:", 7) == 0)
{
value = eval_string_cut (text + 7, 1);
goto end;
}
/* 9. reverse string */
if (strncmp (text, "rev:", 4) == 0)
{
value = string_reverse (text + 4);
goto end;
}
if (strncmp (text, "revscr:", 7) == 0)
{
value = string_reverse_screen (text + 7);
goto end;
}
/* 10. repeated string */
if (strncmp (text, "repeat:", 7) == 0)
{
value = eval_string_repeat (text + 7);
goto end;
}
/*
* 11. length of string:
* length: number of chars
* lengthscr: number of chars displayed on screen
*/
if (strncmp (text, "length:", 7) == 0)
{
length = gui_chat_strlen (text + 7);
snprintf (str_value, sizeof (str_value), "%d", length);
value = strdup (str_value);
goto end;
}
if (strncmp (text, "lengthscr:", 10) == 0)
{
length = gui_chat_strlen_screen (text + 10);
snprintf (str_value, sizeof (str_value), "%d", length);
value = strdup (str_value);
goto end;
}
/* 12: split string */
if (strncmp (text, "split:", 6) == 0)
{
value = eval_string_split (text + 6);
goto end;
}
/* 13: split shell */
if (strncmp (text, "split_shell:", 12) == 0)
{
value = eval_string_split_shell (text + 12);
goto end;
}
/* 14. regex group captured */
if (strncmp (text, "re:", 3) == 0)
{
value = eval_string_regex_group (text + 3, eval_context);
goto end;
}
/* 15. color code */
if (strncmp (text, "color:", 6) == 0)
{
value = eval_string_color (text + 6);
goto end;
}
/* 16. modifier */
if (strncmp (text, "modifier:", 9) == 0)
{
value = eval_string_modifier (text + 9);
goto end;
}
/* 17. info */
if (strncmp (text, "info:", 5) == 0)
{
value = eval_string_info (text + 5);
goto end;
}
/* 18. base_encode/base_decode */
if (strncmp (text, "base_encode:", 12) == 0)
{
value = eval_string_base_encode (text + 12);
goto end;
}
if (strncmp (text, "base_decode:", 12) == 0)
{
value = eval_string_base_decode (text + 12);
goto end;
}
/* 19. current date/time */
if ((strncmp (text, "date", 4) == 0) && (!text[4] || (text[4] == ':')))
{
value = eval_string_date (text + 4);
goto end;
}
/* 20. environment variable */
if (strncmp (text, "env:", 4) == 0)
{
ptr_value = getenv (text + 4);
value = strdup ((ptr_value) ? ptr_value : "");
goto end;
}
/* 21: ternary operator: if:condition?value_if_true:value_if_false */
if (strncmp (text, "if:", 3) == 0)
{
value = eval_string_if (text + 3, eval_context);
goto end;
}
/*
* 22. calculate the result of an expression
* (with number, operators and parentheses)
*/
if (strncmp (text, "calc:", 5) == 0)
{
value = calc_expression (text + 5);
goto end;
}
/*
* 23. random number
*/
if (strncmp (text, "random:", 7) == 0)
{
value = eval_string_random (text + 7);
goto end;
}
/*
* 24. translated text
*/
if (strncmp (text, "translate:", 10) == 0)
{
value = eval_string_translate (text + 10);
goto end;
}
/* 25. define a variable */
if (strncmp (text, "define:", 7) == 0)
{
eval_string_define (text + 7, eval_context);
value = strdup ("");
goto end;
}
/* 25. option: if found, return this value */
if (strncmp (text, "sec.data.", 9) == 0)
{
ptr_value = hashtable_get (secure_hashtable_data, text + 9);
value = strdup ((ptr_value) ? ptr_value : "");
goto end;
}
config_file_search_with_string (text, NULL, NULL, &ptr_option, NULL);
if (ptr_option)
{
if (!ptr_option->value)
{
value = strdup ("");
goto end;
}
switch (ptr_option->type)
{
case CONFIG_OPTION_TYPE_BOOLEAN:
value = strdup (CONFIG_BOOLEAN(ptr_option) ?
EVAL_STR_TRUE : EVAL_STR_FALSE);
goto end;
case CONFIG_OPTION_TYPE_INTEGER:
if (ptr_option->string_values)
{
value = strdup (ptr_option->string_values[CONFIG_INTEGER(ptr_option)]);
goto end;
}
snprintf (str_value, sizeof (str_value),
"%d", CONFIG_INTEGER(ptr_option));
value = strdup (str_value);
goto end;
case CONFIG_OPTION_TYPE_STRING:
value = strdup (CONFIG_STRING(ptr_option));
goto end;
case CONFIG_OPTION_TYPE_COLOR:
value = strdup (gui_color_get_name (CONFIG_COLOR(ptr_option)));
goto end;
case CONFIG_NUM_OPTION_TYPES:
value = strdup ("");
goto end;
}
}
/* 26. local variable in buffer */
ptr_buffer = hashtable_get (eval_context->pointers, "buffer");
if (ptr_buffer)
{
ptr_value = hashtable_get (ptr_buffer->local_variables, text);
if (ptr_value)
{
value = strdup (ptr_value);
goto end;
}
}
/* 27. hdata */
value = eval_string_hdata (text, eval_context);
end:
EVAL_DEBUG_RESULT(1, value);
return value;
}
/*
* Replaces variables in a string.
*
* Note: result must be freed after use.
*/
char *
eval_replace_vars (const char *expr, struct t_eval_context *eval_context)
{
const char *no_replace_prefix_list[] = { "if:", "raw:", NULL };
char *result;
int debug_id;
EVAL_DEBUG_MSG(1, "eval_replace_vars(\"%s\")", expr);
eval_context->recursion_count++;
if (eval_context->recursion_count < EVAL_RECURSION_MAX)
{
result = string_replace_with_callback (expr,
eval_context->prefix,
eval_context->suffix,
no_replace_prefix_list,
&eval_replace_vars_cb,
eval_context,
NULL);
}
else
{
result = strdup ("");
}
eval_context->recursion_count--;
EVAL_DEBUG_RESULT(1, result);
return result;
}
/*
* Compares two expressions.
*
* Returns:
* "1": comparison is true
* "0": comparison is false
*
* Examples:
* "15 > 2": returns "1"
* "abc == def": returns "0"
*
* Note: result must be freed after use.
*/
char *
eval_compare (const char *expr1, int comparison, const char *expr2,
struct t_eval_context *eval_context)
{
int rc, string_compare, length1, length2, debug_id;
regex_t regex;
double value1, value2;
char *error, *value;
EVAL_DEBUG_MSG(1, "eval_compare(\"%s\", \"%s\", \"%s\")",
expr1, comparisons[comparison], expr2);
rc = 0;
string_compare = 0;
if (!expr1 || !expr2)
goto end;
if ((comparison == EVAL_COMPARE_REGEX_MATCHING)
|| (comparison == EVAL_COMPARE_REGEX_NOT_MATCHING))
{
if (string_regcomp (&regex, expr2,
REG_EXTENDED | REG_ICASE | REG_NOSUB) != 0)
{
goto end;
}
rc = (regexec (&regex, expr1, 0, NULL, 0) == 0) ? 1 : 0;
regfree (&regex);
if (comparison == EVAL_COMPARE_REGEX_NOT_MATCHING)
rc ^= 1;
goto end;
}
else if ((comparison == EVAL_COMPARE_STRING_MATCHING_CASE_SENSITIVE)
|| (comparison == EVAL_COMPARE_STRING_NOT_MATCHING_CASE_SENSITIVE))
{
rc = string_match (expr1, expr2, 1);
if (comparison == EVAL_COMPARE_STRING_NOT_MATCHING_CASE_SENSITIVE)
rc ^= 1;
goto end;
}
else if ((comparison == EVAL_COMPARE_STRING_MATCHING)
|| (comparison == EVAL_COMPARE_STRING_NOT_MATCHING))
{
rc = string_match (expr1, expr2, 0);
if (comparison == EVAL_COMPARE_STRING_NOT_MATCHING)
rc ^= 1;
goto end;
}
else if ((comparison == EVAL_COMPARE_INCLUDE_CASE_SENSITIVE)
|| (comparison == EVAL_COMPARE_NOT_INCLUDE_CASE_SENSITIVE))
{
rc = (strstr (expr1, expr2)) ? 1 : 0;
if (comparison == EVAL_COMPARE_NOT_INCLUDE_CASE_SENSITIVE)
rc ^= 1;
goto end;
}
else if ((comparison == EVAL_COMPARE_INCLUDE)
|| (comparison == EVAL_COMPARE_NOT_INCLUDE))
{
rc = (string_strcasestr (expr1, expr2)) ? 1 : 0;
if (comparison == EVAL_COMPARE_NOT_INCLUDE)
rc ^= 1;
goto end;
}
length1 = strlen (expr1);
length2 = strlen (expr2);
/*
* string comparison is forced if expr1 and expr2 have double quotes at
* beginning/end
*/
if (((length1 == 0) || ((expr1[0] == '"') && expr1[length1 - 1] == '"'))
&& ((length2 == 0) || ((expr2[0] == '"') && expr2[length2 - 1] == '"')))
{
string_compare = 1;
}
if (!string_compare)
{
value1 = strtod (expr1, &error);
if (!error || error[0])
{
string_compare = 1;
}
else
{
value2 = strtod (expr2, &error);
if (!error || error[0])
string_compare = 1;
}
}
if (string_compare)
rc = strcmp (expr1, expr2);
else
rc = (value1 < value2) ? -1 : ((value1 > value2) ? 1 : 0);
switch (comparison)
{
case EVAL_COMPARE_EQUAL:
rc = (rc == 0);
break;
case EVAL_COMPARE_NOT_EQUAL:
rc = (rc != 0);
break;
case EVAL_COMPARE_LESS_EQUAL:
rc = (rc <= 0);
break;
case EVAL_COMPARE_LESS:
rc = (rc < 0);
break;
case EVAL_COMPARE_GREATER_EQUAL:
rc = (rc >= 0);
break;
case EVAL_COMPARE_GREATER:
rc = (rc > 0);
break;
case EVAL_NUM_COMPARISONS:
break;
}
end:
value = strdup ((rc) ? EVAL_STR_TRUE : EVAL_STR_FALSE);
EVAL_DEBUG_RESULT(1, value);
return value;
}
/*
* Evaluates a condition (this function must not be called directly).
*
* For return value, see function eval_expression().
*
* Note: result must be freed after use (if not NULL).
*/
char *
eval_expression_condition (const char *expr,
struct t_eval_context *eval_context)
{
int logic, comp, length, level, rc, debug_id;
const char *pos, *pos_end;
char *expr2, *sub_expr, *value, *tmp_value, *tmp_value2;
EVAL_DEBUG_MSG(1, "eval_expression_condition(\"%s\")", expr);
value = NULL;
expr2 = NULL;
if (!expr)
goto end;
if (!expr[0])
{
value = strdup (expr);
goto end;
}
/* skip spaces at beginning of string */
while (expr[0] == ' ')
{
expr++;
}
if (!expr[0])
{
value = strdup (expr);
goto end;
}
/* skip spaces at end of string */
pos_end = expr + strlen (expr) - 1;
while ((pos_end > expr) && (pos_end[0] == ' '))
{
pos_end--;
}
expr2 = string_strndup (expr, pos_end + 1 - expr);
if (!expr2)
goto end;
/*
* search for a logical operator, and if one is found:
* - split expression into two sub-expressions
* - evaluate first sub-expression
* - if needed, evaluate second sub-expression
* - return result
*/
for (logic = 0; logic < EVAL_NUM_LOGICAL_OPS; logic++)
{
pos = eval_strstr_level (expr2, logical_ops[logic], eval_context,
"(", ")", 0);
if (pos > expr2)
{
pos_end = pos - 1;
while ((pos_end > expr2) && (pos_end[0] == ' '))
{
pos_end--;
}
sub_expr = string_strndup (expr2, pos_end + 1 - expr2);
if (!sub_expr)
goto end;
tmp_value = eval_expression_condition (sub_expr, eval_context);
free (sub_expr);
rc = eval_is_true (tmp_value);
if (tmp_value)
free (tmp_value);
/*
* if rc == 0 with "&&" or rc == 1 with "||", no need to
* evaluate second sub-expression, just return the rc
*/
if ((!rc && (logic == EVAL_LOGICAL_OP_AND))
|| (rc && (logic == EVAL_LOGICAL_OP_OR)))
{
value = strdup ((rc) ? EVAL_STR_TRUE : EVAL_STR_FALSE);
goto end;
}
pos += strlen (logical_ops[logic]);
while (pos[0] == ' ')
{
pos++;
}
tmp_value = eval_expression_condition (pos, eval_context);
rc = eval_is_true (tmp_value);
if (tmp_value)
free (tmp_value);
value = strdup ((rc) ? EVAL_STR_TRUE : EVAL_STR_FALSE);
goto end;
}
}
/*
* search for a comparison, and if one is found:
* - split expression into two sub-expressions
* - evaluate the two sub-expressions
* - compare sub-expressions
* - return result
*/
for (comp = 0; comp < EVAL_NUM_COMPARISONS; comp++)
{
pos = eval_strstr_level (expr2, comparisons[comp], eval_context,
"(", ")", 0);
if (pos >= expr2)
{
if (pos > expr2)
{
pos_end = pos - 1;
while ((pos_end > expr2) && (pos_end[0] == ' '))
{
pos_end--;
}
sub_expr = string_strndup (expr2, pos_end + 1 - expr2);
}
else
{
sub_expr = strdup ("");
}
if (!sub_expr)
goto end;
pos += strlen (comparisons[comp]);
while (pos[0] == ' ')
{
pos++;
}
if ((comp == EVAL_COMPARE_REGEX_MATCHING)
|| (comp == EVAL_COMPARE_REGEX_NOT_MATCHING))
{
/* for regex: just replace vars in both expressions */
tmp_value = eval_replace_vars (sub_expr, eval_context);
tmp_value2 = eval_replace_vars (pos, eval_context);
}
else
{
/* other comparison: fully evaluate both expressions */
tmp_value = eval_expression_condition (sub_expr, eval_context);
tmp_value2 = eval_expression_condition (pos, eval_context);
}
free (sub_expr);
value = eval_compare (tmp_value, comp, tmp_value2, eval_context);
if (tmp_value)
free (tmp_value);
if (tmp_value2)
free (tmp_value2);
goto end;
}
}
/*
* evaluate sub-expressions between parentheses and replace them with their
* values
*/
while (expr2[0] == '(')
{
level = 0;
pos = expr2 + 1;
while (pos[0])
{
if (pos[0] == '(')
level++;
else if (pos[0] == ')')
{
if (level == 0)
break;
level--;
}
pos++;
}
/* closing parenthesis not found */
if (pos[0] != ')')
goto end;
sub_expr = string_strndup (expr2 + 1, pos - expr2 - 1);
if (!sub_expr)
goto end;
tmp_value = eval_expression_condition (sub_expr, eval_context);
free (sub_expr);
if (!pos[1])
{
/*
* nothing around parentheses, then return value of
* sub-expression as-is
*/
value = tmp_value;
goto end;
}
length = ((tmp_value) ? strlen (tmp_value) : 0) + 1 +
strlen (pos + 1) + 1;
tmp_value2 = malloc (length);
if (!tmp_value2)
{
if (tmp_value)
free (tmp_value);
goto end;
}
tmp_value2[0] = '\0';
if (tmp_value)
strcat (tmp_value2, tmp_value);
strcat (tmp_value2, " ");
strcat (tmp_value2, pos + 1);
free (expr2);
expr2 = tmp_value2;
if (tmp_value)
free (tmp_value);
}
/*
* at this point, there is no more logical operator neither comparison,
* so we just replace variables in string and return the result
*/
value = eval_replace_vars (expr2, eval_context);
end:
if (expr2)
free (expr2);
EVAL_DEBUG_RESULT(1, value);
return value;
}
/*
* Replaces text in a string using a regular expression and replacement text.
*
* The argument "regex" is a pointer to a regex compiled with WeeChat function
* string_regcomp (or function regcomp).
*
* The argument "replace" is evaluated and can contain any valid expression,
* and these ones:
* ${re:0} .. ${re:99} match 0 to 99 (0 is whole match, 1 .. 99 are groups
* captured)
* ${re:+} the last match (with highest number)
*
* Examples:
*
* string | regex | replace | result
* ----------+---------------+----------------------------+-------------
* test foo | test | Z | Z foo
* test foo | ^(test +)(.*) | ${re:2} | foo
* test foo | ^(test +)(.*) | ${re:1}/ ${hide:*,${re:2}} | test / ***
* test foo | ^(test +)(.*) | ${hide:%,${re:+}} | %%%
*
* Note: result must be freed after use.
*/
char *
eval_replace_regex (const char *string, regex_t *regex, const char *replace,
struct t_eval_context *eval_context)
{
char *result, *result2, *str_replace;
int length, length_replace, start_offset, i, rc, end, debug_id;
int empty_replace_allowed;
struct t_eval_regex eval_regex;
result = NULL;
EVAL_DEBUG_MSG(1, "eval_replace_regex(\"%s\", 0x%lx, \"%s\")",
string, regex, replace);
if (!string || !regex || !replace)
goto end;
length = strlen (string) + 1;
result = malloc (length);
if (!result)
goto end;
snprintf (result, length, "%s", string);
eval_context->regex = &eval_regex;
eval_context->regex_replacement_index = 1;
start_offset = 0;
/* we allow one empty replace if input string is empty */
empty_replace_allowed = (result[0]) ? 0 : 1;
while (result)
{
for (i = 0; i < 100; i++)
{
eval_regex.match[i].rm_so = -1;
}
rc = regexec (regex, result + start_offset, 100, eval_regex.match, 0);
/* no match found: exit the loop */
if ((rc != 0) || (eval_regex.match[0].rm_so < 0))
break;
/*
* if empty string is matching, continue only if empty replace is
* still allowed (to prevent infinite loop)
*/
if (eval_regex.match[0].rm_eo <= 0)
{
if (!empty_replace_allowed)
break;
empty_replace_allowed = 0;
}
/* adjust the start/end offsets */
eval_regex.last_match = 0;
for (i = 0; i < 100; i++)
{
if (eval_regex.match[i].rm_so >= 0)
{
eval_regex.last_match = i;
eval_regex.match[i].rm_so += start_offset;
eval_regex.match[i].rm_eo += start_offset;
}
}
/* check if the regex matched the end of string */
end = !result[eval_regex.match[0].rm_eo];
eval_regex.result = result;
str_replace = eval_replace_vars (replace, eval_context);
length_replace = (str_replace) ? strlen (str_replace) : 0;
length = eval_regex.match[0].rm_so + length_replace +
strlen (result + eval_regex.match[0].rm_eo) + 1;
result2 = malloc (length);
if (!result2)
{
free (result);
result = NULL;
goto end;
}
result2[0] = '\0';
if (eval_regex.match[0].rm_so > 0)
{
memcpy (result2, result, eval_regex.match[0].rm_so);
result2[eval_regex.match[0].rm_so] = '\0';
}
if (str_replace)
strcat (result2, str_replace);
strcat (result2, result + eval_regex.match[0].rm_eo);
free (result);
result = result2;
if (str_replace)
free (str_replace);
if (end)
break;
start_offset = eval_regex.match[0].rm_so + length_replace;
if (!result[start_offset])
break;
(eval_context->regex_replacement_index)++;
}
end:
EVAL_DEBUG_RESULT(1, result);
return result;
}
/*
* Evaluates an expression.
*
* The hashtable "pointers" must have string for keys, pointer for values.
* The hashtable "extra_vars" must have string for keys and values.
* The hashtable "options" must have string for keys and values.
*
* Supported options:
* - prefix: change the default prefix before variables to replace ("${")
* - suffix: change the default suffix after variables to replace ('}")
* - type:
* - condition: evaluate as a condition (use operators/parentheses,
* return a boolean)
*
* If the expression is a condition, it can contain:
* - conditions: == != < <= > >=
* - logical operators: && ||
* - parentheses for priority
*
* Examples of simple expression without condition (the [ ] are NOT part of
* result):
* >> ${window.buffer.number}
* == [2]
* >> buffer:${window.buffer.full_name}
* == [buffer:irc.libera.#weechat]
* >> ${window.win_width}
* == [112]
* >> ${window.win_height}
* == [40]
*
* Examples of conditions:
* >> ${window.buffer.full_name} == irc.libera.#weechat
* == [1]
* >> ${window.buffer.full_name} == irc.libera.#test
* == [0]
* >> ${window.win_width} >= 30 && ${window.win_height} >= 20
* == [1]
*
* Note: result must be freed after use (if not NULL).
*/
char *
eval_expression (const char *expr, struct t_hashtable *pointers,
struct t_hashtable *extra_vars, struct t_hashtable *options)
{
struct t_eval_context context, *eval_context;
struct t_hashtable *user_vars;
int condition, rc, pointers_allocated, regex_allocated, debug_id;
int ptr_window_added, ptr_buffer_added;
long number;
char *value, *error;
const char *default_prefix = EVAL_DEFAULT_PREFIX;
const char *default_suffix = EVAL_DEFAULT_SUFFIX;
const char *ptr_value, *regex_replace;
struct t_gui_window *window;
regex_t *regex;
if (!expr)
return NULL;
condition = 0;
user_vars = NULL;
pointers_allocated = 0;
regex_allocated = 0;
regex = NULL;
regex_replace = NULL;
ptr_window_added = 0;
ptr_buffer_added = 0;
if (pointers)
{
regex = (regex_t *)hashtable_get (pointers, "regex");
}
else
{
/* create hashtable pointers if it's NULL */
pointers = hashtable_new (32,
WEECHAT_HASHTABLE_STRING,
WEECHAT_HASHTABLE_POINTER,
NULL,
NULL);
if (!pointers)
return NULL;
pointers_allocated = 1;
}
user_vars = hashtable_new (32,
WEECHAT_HASHTABLE_STRING,
WEECHAT_HASHTABLE_STRING,
NULL,
NULL);
eval_context = &context;
eval_context->pointers = pointers;
eval_context->extra_vars = extra_vars;
eval_context->user_vars = user_vars;
eval_context->extra_vars_eval = 0;
eval_context->prefix = default_prefix;
eval_context->suffix = default_suffix;
eval_context->regex = NULL;
eval_context->regex_replacement_index = 1;
eval_context->recursion_count = 0;
eval_context->debug_level = 0;
eval_context->debug_depth = 0;
eval_context->debug_id = 0;
eval_context->debug_output = NULL;
/*
* set window/buffer with pointer to current window/buffer
* (if not already defined in the hashtable)
*/
if (gui_current_window)
{
if (!hashtable_has_key (pointers, "window"))
{
hashtable_set (pointers, "window", gui_current_window);
ptr_window_added = 1;
}
if (!hashtable_has_key (pointers, "buffer"))
{
window = (struct t_gui_window *)hashtable_get (pointers, "window");
if (window)
{
hashtable_set (pointers, "buffer", window->buffer);
ptr_buffer_added = 1;
}
}
}
/* read options */
if (options)
{
/* check the type of evaluation */
ptr_value = hashtable_get (options, "type");
if (ptr_value && (strcmp (ptr_value, "condition") == 0))
condition = 1;
/* check if extra vars must be evaluated */
ptr_value = hashtable_get (options, "extra");
if (ptr_value && (strcmp (ptr_value, "eval") == 0))
eval_context->extra_vars_eval = 1;
/* check for custom prefix */
ptr_value = hashtable_get (options, "prefix");
if (ptr_value && ptr_value[0])
eval_context->prefix = ptr_value;
/* check for custom suffix */
ptr_value = hashtable_get (options, "suffix");
if (ptr_value && ptr_value[0])
eval_context->suffix = ptr_value;
/* check for regex */
ptr_value = hashtable_get (options, "regex");
if (ptr_value)
{
regex = malloc (sizeof (*regex));
if (string_regcomp (regex, ptr_value,
REG_EXTENDED | REG_ICASE) == 0)
{
regex_allocated = 1;
}
else
{
free (regex);
regex = NULL;
}
}
/* check for regex replacement (evaluated later) */
ptr_value = hashtable_get (options, "regex_replace");
if (ptr_value)
{
regex_replace = ptr_value;
}
/* check for debug */
ptr_value = hashtable_get (options, "debug");
if (ptr_value && ptr_value[0])
{
number = strtol (ptr_value, &error, 10);
if (error && !error[0] && (number >= 1))
{
eval_context->debug_level = (int)number;
eval_context->debug_output = string_dyn_alloc (256);
}
}
}
EVAL_DEBUG_MSG(1, "eval_expression(\"%s\")", expr);
/* evaluate expression */
if (condition)
{
/* evaluate as condition (return a boolean: "0" or "1") */
value = eval_expression_condition (expr, eval_context);
rc = eval_is_true (value);
if (value)
free (value);
value = strdup ((rc) ? EVAL_STR_TRUE : EVAL_STR_FALSE);
}
else
{
if (regex && regex_replace)
{
/* replace with regex */
value = eval_replace_regex (expr, regex, regex_replace,
eval_context);
}
else
{
/* only replace variables in expression */
value = eval_replace_vars (expr, eval_context);
}
}
if (pointers_allocated)
{
hashtable_free (pointers);
}
else
{
if (ptr_window_added)
hashtable_remove (pointers, "window");
if (ptr_buffer_added)
hashtable_remove (pointers, "buffer");
}
if (user_vars)
hashtable_free (user_vars);
if (regex && regex_allocated)
{
regfree (regex);
free (regex);
}
EVAL_DEBUG_RESULT(1, value);
/* set debug in options hashtable */
if (options && eval_context->debug_output)
hashtable_set (options, "debug_output", *(eval_context->debug_output));
if (eval_context->debug_output)
string_dyn_free (eval_context->debug_output, 1);
return value;
}
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