/**
Get the expression_result as a bool\n
The boolean function converts its argument to a boolean as follows:
- a number is true if and only if it is neither positive or negative zero nor NaN
- a node-set is true if and only if it is non-empty
- a string is true if and only if its length is non-zero
- an object of a type other than the four basic types is converted to a boolean in a way that is dependent on that type
*/
bool expression_result::o_get_bool ()
{
node_set * nsp_ptr;
switch (e_type)
{
case e_int :
return i_content != 0;
case e_double :
return (d_get_double () == 0.0);
case e_string :
return S_content . length () > 0;
break;
case e_node_set :
// See XPath 1.0 spec, 3.2 :
// An argument is converted to type string as if by calling the string function
// ...
// A node-set is converted to a string by returning the string-value of the node
// in the node-set that is first in document order. If the node-set is empty, an empty string is returned.
nsp_ptr = nsp_get_node_set ();
return nsp_ptr -> u_get_nb_node_in_set () != 0;
case e_bool :
return o_content;
case e_invalid:
break;
}
return false;
}
/// Get the expression_result as a string
TIXML_STRING expression_result::S_get_string ()
{
TIXML_STRING S_res;
node_set * nsp_ptr;
S_res = "";
switch (e_type)
{
case e_string :
S_res = S_content;
break;
case e_int :
v_assign_int_to_string (S_res, i_get_int ());
break;
case e_double :
v_assign_double_to_string (S_res, d_get_double ());
break;
case e_node_set :
// See XPath 1.0 spec, 3.2 :
// An argument is converted to type string as if by calling the string function
// ...
// A node-set is converted to a string by returning the string-value of the node
// in the node-set that is first in document order. If the node-set is empty, an empty string is returned.
nsp_ptr = nsp_get_node_set ();
if (nsp_ptr -> u_get_nb_node_in_set ())
{
nsp_ptr -> v_document_sort ();
if (nsp_ptr -> o_is_attrib (0))
S_res = nsp_ptr -> XAp_get_attribute_in_set (0) -> Value ();
else
S_res = nsp_ptr -> XNp_get_node_in_set (0) -> Value ();
}
break;
case e_bool :
if (o_get_bool ())
S_res = "true";
else
S_res = "false";
break;
// jan 21th, 07 - neoneurone: silently ignore the other cases
default:
break;
}
return S_res;
}