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50 lines
1.5 KiB
Rust
50 lines
1.5 KiB
Rust
/// Counts args in the macro invocation by adding `+ 1` for every arg.
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///
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/// # Example
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///
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/// ```ignore
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/// let x = count_args!(("example1"), (10), (25));
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/// assert_eq!(x, 3);
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/// ```
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/// expands to
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/// ```ignore
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/// let x = 0 + 1 + 1 + 1;
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/// assert_eq!(x, 3);
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/// ```
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macro_rules! count_args {
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(@one $($t:tt)*) => { 1 };
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($(($($x:tt)*)),*$(,)?) => {
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0 $(+ count_args!(@one $($x)*))*
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};
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}
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/// Generates a [`std::collections::HashMap`] for `ToolState`'s `tools` variable.
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///
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/// # Example
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///
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/// ```ignore
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/// let tools = gen_tools_hash_map! {
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/// Select => select::Select,
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/// Crop => crop::Crop,
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/// };
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/// ```
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/// expands to
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/// ```ignore
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/// let tools = {
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/// let mut hash_map: std::collections::HashMap<crate::tools::ToolType, Box<dyn crate::tools::Tool>> = std::collections::HashMap::with_capacity(count_args!(/* Macro args */));
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///
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/// hash_map.insert(crate::tools::ToolType::Select, Box::new(select::Select::default()));
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/// hash_map.insert(crate::tools::ToolType::Crop, Box::new(crop::Crop::default()));
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///
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/// hash_map
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/// };
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/// ```
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macro_rules! gen_tools_hash_map {
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($($enum_variant:ident => $struct_path:ty),* $(,)?) => {{
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let mut hash_map: ::std::collections::HashMap<$crate::tools::ToolType, ::std::boxed::Box<dyn $crate::tools::Tool>> = ::std::collections::HashMap::with_capacity(count_args!($(($enum_variant)),*));
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$(hash_map.insert($crate::tools::ToolType::$enum_variant, ::std::boxed::Box::new(<$struct_path>::default()));)*
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hash_map
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}};
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}
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