oauth1-request-derive 0.2.0

A custom derive macro for `oauth1_request::OAuth1Authorize` trait.
Documentation 
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use std::mem;

use proc_macro2::{Span, TokenStream};
use quote::ToTokens;

use util::error;

pub struct Ctxt {
    errors: TokenStream,
}

impl Ctxt {
    pub fn new() -> Self {
        Self {
            errors: TokenStream::new(),
        }
    }

    pub fn error(&mut self, msg: &str, span: Span) {
        error(msg, span).to_tokens(&mut self.errors);
    }

    pub fn emit_errors(mut self) -> Option<TokenStream> {
        let errors = mem::replace(&mut self.errors, TokenStream::new());
        mem::forget(self);
        if errors.is_empty() {
            None
        } else {
            Some(errors)
        }
    }
}

impl Drop for Ctxt {
    fn drop(&mut self) {
        if !::std::thread::panicking() {
            panic!("must call `Ctxt::emit_errors`");
        }
    }
}