const variant& variant::operator[](const variant& v) const
{
if(type_ == TYPE_CALLABLE) {
assert(v.as_int() == 0);
return *this;
}
if(type_ == TYPE_MAP) {
assert(map_);
std::map<variant,variant>::const_iterator i = map_->elements.find(v);
if (i == map_->elements.end())
{
static variant null_variant;
return null_variant;
}
return i->second;
} else if(type_ == TYPE_LIST) {
return operator[](v.as_int());
} else {
throw type_error((formatter() << "type error: "
<< " expected a list or a map but found "
<< variant_type_to_string(type_)
<< " (" << to_debug_string() << ")").str());
}
}
void variant::must_be(variant::TYPE t) const
{
if(type_ != t) {
throw type_error((formatter() << "type error: " << " expected "
<< variant_type_to_string(t) << " but found "
<< variant_type_to_string(type_)
<< " (" << to_debug_string() << ")").str());
}
}
int variant::as_decimal() const
{
if( type_ == TYPE_DECIMAL) {
return decimal_value_;
} else if( type_ == TYPE_INT ) {
return int_value_*1000;
} else if( type_ == TYPE_NULL) {
return 0;
} else {
throw type_error((formatter() << "type error: "
<< " expected integer or decimal but found "
<< variant_type_to_string(type_)
<< " (" << to_debug_string() << ")").str());
}
}
size_t variant::num_elements() const
{
if(type_ == TYPE_CALLABLE) {
return 1;
}
if (type_ == TYPE_LIST) {
assert(list_);
return list_->elements.size();
} else if (type_ == TYPE_MAP) {
assert(map_);
return map_->elements.size();
} else {
throw type_error((formatter() << "type error: "
<< " expected a list or a map but found "
<< variant_type_to_string(type_)
<< " (" << to_debug_string() << ")").str());
}
}
void variant::throw_type_error(variant::TYPE t) const
{
throw type_error(formatter() << "type error: " << " expected " << variant_type_to_string(t) << " but found " << variant_type_to_string(type_) << " (" << to_debug_string() << ")");
}
