azure-functions-codegen 0.1.6

use azure_functions_shared::codegen;
use proc_macro::Diagnostic;
use quote::ToTokens;
use std::borrow::Cow;
use std::convert::TryFrom;
use syn::spanned::Spanned;
use syn::Lit;
use util::{to_camel_case, AttributeArguments, QuotableBorrowedStr, QuotableOption};

pub struct Queue<'a>(pub Cow<'a, codegen::bindings::Queue>);

impl TryFrom<AttributeArguments> for Queue<'_> {
    type Error = Diagnostic;

    fn try_from(args: AttributeArguments) -> Result<Self, Self::Error> {
        let mut name = None;
        let mut queue_name = None;
        let mut connection = None;

        for (key, value) in args.list.iter() {
            let key_str = key.to_string();

            match key_str.as_str() {
                "name" => match value {
                    Lit::Str(s) => {
                        name = Some(Cow::Owned(to_camel_case(&s.value())));
                    }
                    _ => {
                        return Err(value
                            .span()
                            .unstable()
                            .error("expected a literal string value for the 'name' argument"));
                    }
                },
                "queue_name" => match value {
                    Lit::Str(s) => {
                        queue_name = Some(Cow::Owned(s.value()));
                    }
                    _ => {
                        return Err(value.span().unstable().error(
                            "expected a literal string value for the 'queue_name' argument",
                        ));
                    }
                },
                "connection" => match value {
                    Lit::Str(s) => {
                        connection = Some(Cow::Owned(s.value()));
                    }
                    _ => {
                        return Err(value.span().unstable().error(
                            "expected a literal string value for the 'connection' argument",
                        ));
                    }
                },
                _ => {
                    return Err(key.span().unstable().error(format!(
                        "unsupported binding attribute argument '{}'",
                        key_str
                    )));
                }
            };
        }

        if queue_name.is_none() {
            return Err(args
                .span
                .error("the 'queue_name' argument is required for queue message bindings."));
        }

        Ok(Queue(Cow::Owned(codegen::bindings::Queue {
            name: name.expect("expected a name for the QueueMessage binding"),
            queue_name: queue_name.expect("expected a queue name for QueueMessage binding"),
            connection: connection,
        })))
    }
}

impl ToTokens for Queue<'_> {
    fn to_tokens(&self, tokens: &mut ::proc_macro2::TokenStream) {
        let name = QuotableBorrowedStr(&self.0.name);
        let queue_name = QuotableBorrowedStr(&self.0.queue_name);
        let connection = QuotableOption(self.0.connection.as_ref().map(|x| QuotableBorrowedStr(x)));

        quote!(::azure_functions::codegen::bindings::Queue {
            name: #name,
            queue_name: #queue_name,
            connection: #connection,
        }).to_tokens(tokens)
    }
}