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/* Copyright (c) 2002-2016 Pigeonhole authors, see the included COPYING file
*/
#include "lib.h"
#include "str.h"
#include "str-sanitize.h"
#include "array.h"
#include "sieve-common.h"
#include "sieve-ast.h"
#include "sieve-commands.h"
#include "sieve-code.h"
#include "sieve-validator.h"
#include "sieve-generator.h"
#include "sieve-dump.h"
#include "ext-variables-common.h"
#include "ext-variables-limits.h"
#include "ext-variables-name.h"
#include "ext-variables-operands.h"
#include "ext-variables-namespaces.h"
#include "ext-variables-arguments.h"
/*
* Variable argument implementation
*/
static bool arg_variable_generate
(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
struct sieve_command *context);
const struct sieve_argument_def variable_argument = {
.identifier = "@variable",
.generate = arg_variable_generate
};
static bool ext_variables_variable_argument_activate
(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
struct sieve_ast_argument *arg, const char *variable)
{
struct sieve_ast *ast = arg->ast;
struct sieve_variable *var;
var = ext_variables_validator_declare_variable(this_ext, valdtr, variable);
if ( var == NULL ) {
sieve_argument_validate_error(valdtr, arg,
"(implicit) declaration of new variable '%s' exceeds the limit "
"(max variables: %u)", variable,
EXT_VARIABLES_MAX_SCOPE_SIZE);
return FALSE;
}
arg->argument = sieve_argument_create(ast, &variable_argument, this_ext, 0);
arg->argument->data = (void *) var;
return TRUE;
}
static struct sieve_ast_argument *ext_variables_variable_argument_create
(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
struct sieve_ast_argument *parent_arg, const char *variable)
{
struct sieve_ast *ast = parent_arg->ast;
struct sieve_ast_argument *new_arg;
new_arg = sieve_ast_argument_create(ast, sieve_ast_argument_line(parent_arg));
new_arg->type = SAAT_STRING;
if ( !ext_variables_variable_argument_activate
(this_ext, valdtr, new_arg, variable) )
return NULL;
return new_arg;
}
static bool arg_variable_generate
(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
struct sieve_command *context ATTR_UNUSED)
{
struct sieve_argument *argument = arg->argument;
struct sieve_variable *var = (struct sieve_variable *) argument->data;
sieve_variables_opr_variable_emit(cgenv->sblock, argument->ext, var);
return TRUE;
}
/*
* Match value argument implementation
*/
static bool arg_match_value_generate
(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
struct sieve_command *context ATTR_UNUSED);
const struct sieve_argument_def match_value_argument = {
.identifier = "@match_value",
.generate = arg_match_value_generate
};
static bool ext_variables_match_value_argument_activate
(const struct sieve_extension *this_ext,
struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
unsigned int index, bool assignment)
{
struct sieve_ast *ast = arg->ast;
if ( assignment ) {
sieve_argument_validate_error(valdtr, arg,
"cannot assign to match variable");
return FALSE;
}
if ( index > EXT_VARIABLES_MAX_MATCH_INDEX ) {
sieve_argument_validate_error(valdtr, arg,
"match value index %u out of range (max: %u)", index,
EXT_VARIABLES_MAX_MATCH_INDEX);
return FALSE;
}
arg->argument = sieve_argument_create
(ast, &match_value_argument, this_ext, 0);
arg->argument->data = (void *) POINTER_CAST(index);
return TRUE;
}
static struct sieve_ast_argument *ext_variables_match_value_argument_create
(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
struct sieve_ast_argument *parent_arg, unsigned int index)
{
struct sieve_ast *ast = parent_arg->ast;
struct sieve_ast_argument *new_arg;
new_arg = sieve_ast_argument_create(ast, sieve_ast_argument_line(parent_arg));
new_arg->type = SAAT_STRING;
if ( !ext_variables_match_value_argument_activate
(this_ext, valdtr, new_arg, index, FALSE) ) {
return NULL;
}
return new_arg;
}
static bool arg_match_value_generate
(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
struct sieve_command *context ATTR_UNUSED)
{
struct sieve_argument *argument = arg->argument;
unsigned int index = POINTER_CAST_TO(argument->data, unsigned int);
sieve_variables_opr_match_value_emit(cgenv->sblock, argument->ext, index);
return TRUE;
}
/*
* Variable string argument implementation
*/
static bool arg_variable_string_validate
(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
struct sieve_command *cmd);
const struct sieve_argument_def variable_string_argument = {
.identifier = "@variable-string",
.validate = arg_variable_string_validate,
.generate = sieve_arg_catenated_string_generate,
};
static bool arg_variable_string_validate
(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
struct sieve_command *cmd)
{
const struct sieve_extension *this_ext = (*arg)->argument->ext;
enum { ST_NONE, ST_OPEN, ST_VARIABLE, ST_CLOSE } state = ST_NONE;
pool_t pool = sieve_ast_pool((*arg)->ast);
struct sieve_arg_catenated_string *catstr = NULL;
string_t *str = sieve_ast_argument_str(*arg);
const char *p, *strstart, *substart = NULL;
const char *strval = (const char *) str_data(str);
const char *strend = strval + str_len(str);
bool result = TRUE;
ARRAY_TYPE(sieve_variable_name) substitution;
int nelements = 0;
T_BEGIN {
/* Initialize substitution structure */
t_array_init(&substitution, 2);
p = strval;
strstart = p;
while ( result && p < strend ) {
switch ( state ) {
/* Nothing found yet */
case ST_NONE:
if ( *p == '$' ) {
substart = p;
state = ST_OPEN;
}
p++;
break;
/* Got '$' */
case ST_OPEN:
if ( *p == '{' ) {
state = ST_VARIABLE;
p++;
} else
state = ST_NONE;
break;
/* Got '${' */
case ST_VARIABLE:
nelements = ext_variable_name_parse(&substitution, &p, strend);
if ( nelements < 0 )
state = ST_NONE;
else
state = ST_CLOSE;
break;
/* Finished parsing name, expecting '}' */
case ST_CLOSE:
if ( *p == '}' ) {
struct sieve_ast_argument *strarg;
/* We now know that the substitution is valid */
if ( catstr == NULL ) {
catstr = sieve_arg_catenated_string_create(*arg);
}
/* Add the substring that is before the substitution to the
* variable-string AST.
*
* FIXME: For efficiency, if the variable is not found we should
* coalesce this substring with the one after the substitution.
*/
if ( substart > strstart ) {
string_t *newstr = str_new(pool, substart - strstart);
str_append_n(newstr, strstart, substart - strstart);
strarg = sieve_ast_argument_string_create_raw
((*arg)->ast, newstr, (*arg)->source_line);
sieve_arg_catenated_string_add_element(catstr, strarg);
/* Give other substitution extensions a chance to do their work */
if ( !sieve_validator_argument_activate_super
(valdtr, cmd, strarg, FALSE) ) {
result = FALSE;
break;
}
}
/* Find the variable */
if ( nelements == 1 ) {
const struct sieve_variable_name *cur_element =
array_idx(&substitution, 0);
if ( cur_element->num_variable == -1 ) {
/* Add variable argument '${identifier}' */
strarg = ext_variables_variable_argument_create
(this_ext, valdtr, *arg, str_c(cur_element->identifier));
} else {
/* Add match value argument '${000}' */
strarg = ext_variables_match_value_argument_create
(this_ext, valdtr, *arg, cur_element->num_variable);
}
} else {
strarg = ext_variables_namespace_argument_create
(this_ext, valdtr, *arg, cmd, &substitution);
}
if ( strarg != NULL )
sieve_arg_catenated_string_add_element(catstr, strarg);
strstart = p + 1;
substart = strstart;
p++;
}
/* Finished, reset for the next substitution */
state = ST_NONE;
}
}
} T_END;
/* Bail out early if substitution is invalid */
if ( !result ) return FALSE;
/* Check whether any substitutions were found */
if ( catstr == NULL ) {
/* No substitutions in this string, pass it on to any other substution
* extension.
*/
return sieve_validator_argument_activate_super(valdtr, cmd, *arg, TRUE);
}
/* Add the final substring that comes after the last substitution to the
* variable-string AST.
*/
if ( strend > strstart ) {
struct sieve_ast_argument *strarg;
string_t *newstr = str_new(pool, strend - strstart);
str_append_n(newstr, strstart, strend - strstart);
strarg = sieve_ast_argument_string_create_raw
((*arg)->ast, newstr, (*arg)->source_line);
sieve_arg_catenated_string_add_element(catstr, strarg);
/* Give other substitution extensions a chance to do their work */
if ( !sieve_validator_argument_activate_super
(valdtr, cmd, strarg, FALSE) )
return FALSE;
}
return TRUE;
}
/*
* Variable argument interface
*/
static bool _sieve_variable_argument_activate
(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
struct sieve_command *cmd, struct sieve_ast_argument *arg, bool assignment)
{
bool result = FALSE;
string_t *variable;
const char *varstr, *varend;
ARRAY_TYPE(sieve_variable_name) vname;
int nelements = 0;
T_BEGIN {
t_array_init(&vname, 2);
variable = sieve_ast_argument_str(arg);
varstr = str_c(variable);
varend = PTR_OFFSET(varstr, str_len(variable));
nelements = ext_variable_name_parse(&vname, &varstr, varend);
/* Check whether name parsing succeeded */
if ( nelements <= 0 || varstr != varend ) {
/* Parse failed */
sieve_argument_validate_error(valdtr, arg,
"invalid variable name '%s'", str_sanitize(str_c(variable),80));
} else if ( nelements == 1 ) {
/* Normal (match) variable */
const struct sieve_variable_name *cur_element =
array_idx(&vname, 0);
if ( cur_element->num_variable < 0 ) {
/* Variable */
result = ext_variables_variable_argument_activate
(this_ext, valdtr, arg, str_c(cur_element->identifier));
} else {
/* Match value */
result = ext_variables_match_value_argument_activate
(this_ext, valdtr, arg, cur_element->num_variable, assignment);
}
} else {
/* Namespace variable */
result = ext_variables_namespace_argument_activate
(this_ext, valdtr, arg, cmd, &vname, assignment);
}
} T_END;
return result;
}
bool sieve_variable_argument_activate
(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
struct sieve_command *cmd, struct sieve_ast_argument *arg,
bool assignment)
{
if ( sieve_ast_argument_type(arg) == SAAT_STRING ) {
/* Single string */
return _sieve_variable_argument_activate
(this_ext, valdtr, cmd, arg, assignment);
} else if ( sieve_ast_argument_type(arg) == SAAT_STRING_LIST ) {
/* String list */
struct sieve_ast_argument *stritem;
i_assert ( !assignment );
stritem = sieve_ast_strlist_first(arg);
while ( stritem != NULL ) {
if ( !_sieve_variable_argument_activate
(this_ext, valdtr, cmd, stritem, assignment) )
return FALSE;
stritem = sieve_ast_strlist_next(stritem);
}
arg->argument = sieve_argument_create
(arg->ast, &string_list_argument, NULL, 0);
return TRUE;
}
return FALSE;
}
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