/**
* The String.prototype object's 'charCodeAt' routine
*
* See also:
* ECMA-262 v5, 15.5.4.5
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value.
*/
static ecma_completion_value_t
ecma_builtin_string_prototype_object_char_code_at (ecma_value_t this_arg, /**< this argument */
ecma_value_t arg) /**< routine's argument */
{
ecma_completion_value_t ret_value = ecma_make_empty_completion_value ();
/* 1 */
ECMA_TRY_CATCH (check_coercible_val,
ecma_op_check_object_coercible (this_arg),
ret_value);
/* 2 */
ECMA_TRY_CATCH (to_string_val,
ecma_op_to_string (this_arg),
ret_value);
/* 3 */
ECMA_OP_TO_NUMBER_TRY_CATCH (index_num,
arg,
ret_value);
/* 4 */
ecma_string_t *original_string_p = ecma_get_string_from_value (to_string_val);
const ecma_length_t len = ecma_string_get_length (original_string_p);
ecma_number_t *ret_num_p = ecma_alloc_number ();
/* 5 */
// When index_num is NaN, then the first two comparisons are false
if (index_num < 0 || index_num >= len || (ecma_number_is_nan (index_num) && !len))
{
*ret_num_p = ecma_number_make_nan ();
}
else
{
/* 6 */
/*
* String length is currently uit32_t, but index_num may be bigger,
* ToInteger performs floor, while ToUInt32 performs modulo 2^32,
* hence after the check 0 <= index_num < len we assume to_uint32 can be used.
* We assume to_uint32 (NaN) is 0.
*/
JERRY_ASSERT (ecma_number_is_nan (index_num) || ecma_number_to_uint32 (index_num) == ecma_number_trunc (index_num));
ecma_char_t new_ecma_char = ecma_string_get_char_at_pos (original_string_p, ecma_number_to_uint32 (index_num));
*ret_num_p = ecma_uint32_to_number (new_ecma_char);
}
ecma_value_t new_value = ecma_make_number_value (ret_num_p);
ret_value = ecma_make_normal_completion_value (new_value);
ECMA_OP_TO_NUMBER_FINALIZE (index_num);
ECMA_FINALIZE (to_string_val);
ECMA_FINALIZE (check_coercible_val);
return ret_value;
} /* ecma_builtin_string_prototype_object_char_code_at */
/**
* The String.prototype object's 'charAt' routine
*
* See also:
* ECMA-262 v5, 15.5.4.4
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value.
*/
static ecma_completion_value_t
ecma_builtin_string_prototype_object_char_at (ecma_value_t this_arg, /**< this argument */
ecma_value_t arg) /**< routine's argument */
{
ecma_completion_value_t ret_value = ecma_make_empty_completion_value ();
/* 1 */
ECMA_TRY_CATCH (check_coercible_val,
ecma_op_check_object_coercible (this_arg),
ret_value);
/* 2 */
ECMA_TRY_CATCH (to_string_val,
ecma_op_to_string (this_arg),
ret_value);
/* 3 */
ECMA_OP_TO_NUMBER_TRY_CATCH (index_num,
arg,
ret_value);
/* 4 */
ecma_string_t *original_string_p = ecma_get_string_from_value (to_string_val);
const ecma_length_t len = ecma_string_get_length (original_string_p);
/* 5 */
if (index_num < 0 || index_num >= len || !len)
{
ret_value = ecma_make_normal_completion_value (ecma_make_string_value (
ecma_get_magic_string (LIT_MAGIC_STRING__EMPTY)));
}
else
{
/* 6 */
ecma_char_t new_ecma_char = ecma_string_get_char_at_pos (original_string_p, ecma_number_to_uint32 (index_num));
ret_value = ecma_make_normal_completion_value (ecma_make_string_value (
ecma_new_ecma_string_from_code_unit (new_ecma_char)));
}
ECMA_OP_TO_NUMBER_FINALIZE (index_num);
ECMA_FINALIZE (to_string_val);
ECMA_FINALIZE (check_coercible_val);
return ret_value;
} /* ecma_builtin_string_prototype_object_char_at */
/**
* [[GetOwnProperty]] ecma String object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
* ECMA-262 v5, 15.5.5.2
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_property_t *
ecma_op_string_object_get_own_property (ecma_object_t *obj_p, /**< a String object */
ecma_string_t *property_name_p) /**< property name */
{
JERRY_ASSERT (ecma_get_object_type (obj_p) == ECMA_OBJECT_TYPE_STRING);
// 1.
ecma_property_t *prop_p = ecma_op_general_object_get_own_property (obj_p, property_name_p);
// 2.
if (prop_p != NULL)
{
return prop_p;
}
// 3., 5.
uint32_t uint32_index;
ecma_string_t *new_prop_name_p;
if (ECMA_STRING_GET_CONTAINER (property_name_p) == ECMA_STRING_CONTAINER_UINT32_IN_DESC)
{
uint32_index = property_name_p->u.uint32_number;
new_prop_name_p = property_name_p;
ecma_ref_ecma_string (new_prop_name_p);
}
else
{
ecma_number_t index = ecma_string_to_number (property_name_p);
uint32_index = ecma_number_to_uint32 (index);
ecma_string_t *to_str_p = ecma_new_ecma_string_from_uint32 (uint32_index);
bool are_equal = ecma_compare_ecma_strings (to_str_p, property_name_p);
if (!are_equal)
{
ecma_deref_ecma_string (to_str_p);
return NULL;
}
else
{
new_prop_name_p = to_str_p;
}
}
// 4.
ecma_property_t *prim_value_prop_p = ecma_get_internal_property (obj_p,
ECMA_INTERNAL_PROPERTY_ECMA_VALUE);
ecma_string_t *prim_value_str_p;
prim_value_str_p = ecma_get_string_from_value (ecma_get_internal_property_value (prim_value_prop_p));
// 6.
ecma_length_t length = ecma_string_get_length (prim_value_str_p);
ecma_property_t *new_prop_p;
if (uint32_index >= (uint32_t) length)
{
// 7.
new_prop_p = NULL;
}
else
{
// 8.
ecma_char_t c = ecma_string_get_char_at_pos (prim_value_str_p, uint32_index);
// 9.
ecma_string_t *new_prop_str_value_p = ecma_new_ecma_string_from_code_unit (c);
new_prop_p = ecma_create_named_data_property (obj_p,
new_prop_name_p,
ECMA_PROPERTY_FLAG_ENUMERABLE);
ecma_set_named_data_property_value (new_prop_p,
ecma_make_string_value (new_prop_str_value_p));
}
ecma_deref_ecma_string (new_prop_name_p);
return new_prop_p;
} /* ecma_op_string_object_get_own_property */
