restify-macros 0.0.6

STILL WIP
Documentation 
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use crate::attr_parsing::{combine_attribute, parse_parenthesized_attribute, Combine};
use syn::{
  parse::{Parse, ParseStream},
  Token,
};

pub(crate) mod kw {
  syn::custom_keyword!(via);
  syn::custom_keyword!(rejection);
  syn::custom_keyword!(state);
}

#[derive(Default)]
pub(super) struct InjectableContainerAttrs {
  pub(super) via: Option<(kw::via, syn::Path)>,
  pub(super) rejection: Option<(kw::rejection, syn::Path)>,
  pub(super) state: Option<(kw::state, syn::Type)>,
}

impl Parse for InjectableContainerAttrs {
  fn parse(input: ParseStream) -> syn::Result<Self> {
    let mut via = None;
    let mut rejection = None;
    let mut state = None;

    while !input.is_empty() {
      let lh = input.lookahead1();
      if lh.peek(kw::via) {
        parse_parenthesized_attribute(input, &mut via)?;
      } else if lh.peek(kw::rejection) {
        parse_parenthesized_attribute(input, &mut rejection)?;
      } else if lh.peek(kw::state) {
        parse_parenthesized_attribute(input, &mut state)?;
      } else {
        return Err(lh.error());
      }

      let _ = input.parse::<Token![,]>();
    }

    Ok(Self {
      via,
      rejection,
      state,
    })
  }
}

impl Combine for InjectableContainerAttrs {
  fn combine(mut self, other: Self) -> syn::Result<Self> {
    let Self {
      via,
      rejection,
      state,
    } = other;
    combine_attribute(&mut self.via, via)?;
    combine_attribute(&mut self.rejection, rejection)?;
    combine_attribute(&mut self.state, state)?;
    Ok(self)
  }
}

#[derive(Default)]
pub(super) struct InjectableFieldAttrs {
  pub(super) via: Option<(kw::via, syn::Path)>,
}

impl Parse for InjectableFieldAttrs {
  fn parse(input: ParseStream) -> syn::Result<Self> {
    let mut via = None;

    while !input.is_empty() {
      let lh = input.lookahead1();
      if lh.peek(kw::via) {
        parse_parenthesized_attribute(input, &mut via)?;
      } else {
        return Err(lh.error());
      }

      let _ = input.parse::<Token![,]>();
    }

    Ok(Self { via })
  }
}

impl Combine for InjectableFieldAttrs {
  fn combine(mut self, other: Self) -> syn::Result<Self> {
    let Self { via } = other;
    combine_attribute(&mut self.via, via)?;
    Ok(self)
  }
}