Implement common traits

[marcoieni]

from the api guidelines:
https://rust-lang.github.io/api-guidelines/interoperability.html

Device should implement the following common traits:

• Copy
• Clone
• Eq
• PartialEq
• Ord
• PartialOrd
• Hash
• Debug
• Display
• Default

[cr1901]

@marcoieni I ran headfirst into this issue as well. My workaround for now is the following:

// Newtype to implement PartialEq on svd::Device without needing
// to fork the crate.
#[derive(Debug)]
struct DeviceWrapper(svd::Device);

impl PartialEq<DeviceWrapper> for DeviceWrapper {
    fn eq(&self, other: &DeviceWrapper) -> bool {
        let dev_self : &svd::Device = &self.0;
        let other_self : &svd::Device = &self.0;

        (dev_self.name == other_self.name) &&
        (dev_self.version == other_self.version) &&
        (dev_self.description == other_self.description) &&
        (dev_self.address_unit_bits == other_self.address_unit_bits) &&
        (dev_self.width == other_self.width) &&
        (dev_self.cpu == other_self.cpu) &&
        (dev_self.peripherals == other_self.peripherals) &&
        (dev_self.default_register_properties == other_self.default_register_properties)
    }
}

...
match svd::parse(&out_svd) {
        Ok(parsed) => { assert_eq!(DeviceWrapper(svd_dev), DeviceWrapper(parsed)); },
        Err(e) => {
            eprintln!("Parsing output file {} during round-trip test failed", out_svd);
            return;
        }
    }

Unfortunately, this is not sufficient for my needs for msp430_svd and trying to remove the outdated local copy of svd-parser we have.

It's not possible for me to actually construct peripheral instances at all because the _extensible: (), field is private. I believe this would be solved if a Default implementation was derived, combined with struct update syntax (..)?

Perhaps provide it behind a feature gate?

[marcoieni]

Wow, thank you for the workaround, but I would prefer a proper fix in this repo

It's not possible for me to actually construct peripheral instances at all

See #101