protify 0.1.4

A Rust-first protobuf framework to generate packages from rust code, with validation included
Documentation 
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use crate::*;

/// A struct representing a protobuf Extension.
#[derive(Debug, PartialEq, Builder)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
#[non_exhaustive]
pub struct Extension {
	pub target: ExtensionTarget,
	pub fields: Vec<Field>,
}

/// Implemented by the [`proto_extension`] macro.
pub trait ProtoExtension {
	fn proto_schema() -> Extension;
}

/// Valid extension targets for a Proto3 file.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[allow(clippy::enum_variant_names)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub enum ExtensionTarget {
	FileOptions,
	MessageOptions,
	FieldOptions,
	OneofOptions,
	EnumOptions,
	EnumValueOptions,
	ServiceOptions,
	MethodOptions,
}

impl ExtensionTarget {
	/// Returns the string representation.
	#[must_use]
	pub const fn as_str(&self) -> &'static str {
		match self {
			Self::FileOptions => "google.protobuf.FileOptions",
			Self::MessageOptions => "google.protobuf.MessageOptions",
			Self::FieldOptions => "google.protobuf.FieldOptions",
			Self::OneofOptions => "google.protobuf.OneofOptions",
			Self::EnumOptions => "google.protobuf.EnumOptions",
			Self::EnumValueOptions => "google.protobuf.EnumValueOptions",
			Self::ServiceOptions => "google.protobuf.ServiceOptions",
			Self::MethodOptions => "google.protobuf.MethodOptions",
		}
	}
}

impl Display for ExtensionTarget {
	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
		write!(f, "{}", self.as_str())
	}
}