1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129

mod route;
mod args;
#[cfg(feature = "ws")]
mod ws;
#[cfg(feature = "api")]
mod api;
#[cfg(all(feature = "api", feature = "stream"))]
mod api_stream;
mod util;

use args::Args;
#[cfg(feature = "api")]
use args::ApiArgs;

use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, ItemFn};


enum Method {
	Get,
	Post,
	Put,
	Delete,
	Head
}

impl Method {
	pub fn as_str(&self) -> &'static str {
		match self {
			Self::Get => "GET",
			Self::Post => "POST",
			Self::Put => "PUT",
			Self::Delete => "DELETE",
			Self::Head => "HEAD"
		}
	}
}

#[allow(dead_code)]
enum TransformOutput {
	No,
	Json
}

fn to_compile_error(error: syn::Error) -> TokenStream {
	let compile_error = error.to_compile_error();
	quote!(#compile_error).into()
}

macro_rules! attribute_route {
	($name:ident, $method:ident, No) => {
		attribute_route!(_; $name, $method, No,);
	};
	($name:ident, $method:ident, Json) => {
		attribute_route!(_; $name, $method, Json, #[cfg(feature = "json")]);
	};
	(_; $name:ident, $method:ident, $output:ident, $(#[$attr:meta])*) => {
		#[proc_macro_attribute]
		$(#[$attr])*
		pub fn $name(attrs: TokenStream, item: TokenStream) -> TokenStream {
			let args = parse_macro_input!(attrs as Args);
			let item = parse_macro_input!(item as ItemFn);

			let stream = route::expand(
				args,
				item,
				Method::$method,
				TransformOutput::$output
			);

			stream
				.map(|stream| stream.into())
				.unwrap_or_else(to_compile_error)
		}
	}
}

attribute_route!(get, Get, No);
attribute_route!(post, Post, No);
attribute_route!(put, Put, No);
attribute_route!(delete, Delete, No);
attribute_route!(head, Head, No);


attribute_route!(get_json, Get, Json);
attribute_route!(post_json, Post, Json);
attribute_route!(put_json, Put, Json);
attribute_route!(delete_json, Delete, Json);
attribute_route!(head_json, Head, Json);

#[proc_macro_attribute]
#[cfg(feature = "ws")]
pub fn ws(attrs: TokenStream, item: TokenStream) -> TokenStream {
	let args = parse_macro_input!(attrs as Args);
	let item = parse_macro_input!(item as ItemFn);

	let stream = ws::expand(args, item);

	stream
		.map(|stream| stream.into())
		.unwrap_or_else(to_compile_error)
}

#[proc_macro_attribute]
#[cfg(feature = "api")]
pub fn api(attrs: TokenStream, item: TokenStream) -> TokenStream {
	let args = parse_macro_input!(attrs as ApiArgs);
	let item = parse_macro_input!(item as ItemFn);

	let stream = api::expand(args, item);

	stream
		.map(|stream| stream.into())
		.unwrap_or_else(to_compile_error)
}

#[proc_macro_attribute]
#[cfg(all(feature = "api", feature = "stream"))]
pub fn api_stream(attrs: TokenStream, item: TokenStream) -> TokenStream {
	let args = parse_macro_input!(attrs as ApiArgs);
	let item = parse_macro_input!(item as ItemFn);

	let stream = api_stream::expand(args, item);

	stream
		.map(|stream| stream.into())
		.unwrap_or_else(to_compile_error)
}