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#[macro_export]
#[doc(hidden)]
macro_rules! sql_function_body {
($fn_name:ident, $struct_name:ident, ($($arg_name:ident: $arg_type:ty),*) -> $return_type:ty,
$docs: expr) => {
#[allow(non_camel_case_types)]
#[derive(Debug, Clone, Copy)]
#[doc(hidden)]
pub struct $struct_name<$($arg_name),*> {
$($arg_name: $arg_name),*
}
#[allow(non_camel_case_types)]
pub type $fn_name<$($arg_name),*> = $struct_name<$(
<$arg_name as $crate::expression::AsExpression<$arg_type>>::Expression
),*>;
#[allow(non_camel_case_types)]
#[doc=$docs]
pub fn $fn_name<$($arg_name),*>($($arg_name: $arg_name),*)
-> $fn_name<$($arg_name),*>
where $($arg_name: $crate::expression::AsExpression<$arg_type>),+
{
$struct_name {
$($arg_name: $arg_name.as_expression()),+
}
}
#[allow(non_camel_case_types)]
impl<$($arg_name),*> $crate::expression::Expression for $struct_name<$($arg_name),*> where
for <'a> ($(&'a $arg_name),*): $crate::expression::Expression,
{
type SqlType = $return_type;
fn to_sql(&self, out: &mut $crate::query_builder::QueryBuilder)
-> $crate::query_builder::BuildQueryResult {
out.push_sql(concat!(stringify!($fn_name), "("));
try!($crate::expression::Expression::to_sql(
&($(&self.$arg_name),*), out));
out.push_sql(")");
Ok(())
}
}
#[allow(non_camel_case_types)]
impl<$($arg_name),*, QS> $crate::expression::SelectableExpression<QS> for $struct_name<$($arg_name),*> where
$($arg_name: $crate::expression::SelectableExpression<QS>,)*
$struct_name<$($arg_name),*>: $crate::expression::Expression,
{
}
#[allow(non_camel_case_types)]
impl<$($arg_name),*> $crate::expression::NonAggregate for $struct_name<$($arg_name),*> where
$($arg_name: $crate::expression::NonAggregate,)*
$struct_name<$($arg_name),*>: $crate::expression::Expression,
{
}
}
}
#[macro_export]
macro_rules! sql_function {
($fn_name:ident, $struct_name:ident, ($($arg_name:ident: $arg_type:ty),*) -> $return_type:ty) => {
sql_function!($fn_name, $struct_name, ($($arg_name: $arg_type),*) -> $return_type, "");
};
($fn_name:ident, $struct_name:ident, ($($arg_name:ident: $arg_type:ty),*) -> $return_type:ty,
$docs: expr) => {
sql_function_body!($fn_name, $struct_name, ($($arg_name: $arg_type),*) -> $return_type, $docs);
}
}
#[macro_export]
#[doc(hidden)]
macro_rules! no_arg_sql_function_body {
($type_name:ident, $return_type:ty, $docs:expr) => {
#[allow(non_camel_case_types)]
#[doc=$docs]
pub struct $type_name;
impl $crate::expression::Expression for $type_name {
type SqlType = $return_type;
fn to_sql(&self, out: &mut $crate::query_builder::QueryBuilder)
-> $crate::query_builder::BuildQueryResult {
out.push_sql(concat!(stringify!($type_name), "()"));
Ok(())
}
}
impl<QS> $crate::expression::SelectableExpression<QS> for $type_name {
}
impl $crate::expression::NonAggregate for $type_name {
}
}
}
#[macro_export]
macro_rules! no_arg_sql_function {
($type_name:ident, $return_type:ty) => {
no_arg_sql_function!($type_name, $return_type, "");
};
($type_name:ident, $return_type:ty, $docs:expr) => {
no_arg_sql_function_body!($type_name, $return_type, $docs);
}
}
pub mod aggregate_ordering;
pub mod date_and_time;