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#[allow(unused_macros)]
macro count {
  () => { 0u8 },
  ($x:tt $($xs:tt)*) => {1u8 + count!($($xs)*)}
}

pub macro hid {
  ($(( $($xs:tt),*)),+ $(,)?) => { &[ $( (count!($($xs)*)-1) | $($xs),* ),* ] }
}

// Main items
pub const HIDINPUT: u8 = 0x80;
pub const HIDOUTPUT: u8 = 0x90;
pub const FEATURE: u8 = 0xb0;
pub const COLLECTION: u8 = 0xa0;
pub const END_COLLECTION: u8 = 0xc0;

// Global items
pub const USAGE_PAGE: u8 = 0x04;
pub const LOGICAL_MINIMUM: u8 = 0x14;
pub const LOGICAL_MAXIMUM: u8 = 0x24;
pub const PHYSICAL_MINIMUM: u8 = 0x34;
pub const PHYSICAL_MAXIMUM: u8 = 0x44;
pub const UNIT_EXPONENT: u8 = 0x54;
pub const UNIT: u8 = 0x64;
pub const REPORT_SIZE: u8 = 0x74; //bits
pub const REPORT_ID: u8 = 0x84;
pub const REPORT_COUNT: u8 = 0x94; //bytes
pub const PUSH: u8 = 0xa4;
pub const POP: u8 = 0xb4;

// Local items
pub const USAGE: u8 = 0x08;
pub const USAGE_MINIMUM: u8 = 0x18;
pub const USAGE_MAXIMUM: u8 = 0x28;
pub const DESIGNATOR_INDEX: u8 = 0x38;
pub const DESIGNATOR_MINIMUM: u8 = 0x48;
pub const DESIGNATOR_MAXIMUM: u8 = 0x58;
pub const STRING_INDEX: u8 = 0x78;
pub const STRING_MINIMUM: u8 = 0x88;
pub const STRING_MAXIMUM: u8 = 0x98;
pub const DELIMITER: u8 = 0xa8;