slog_mock_proc_macros/
lib.rs

1/*
2 * lib.rs
3 *
4 * slog-mock-proc-macros - Mock crate for slog to compile out all logging.
5 * Copyright (c) 2021 Ammon Smith
6 *
7 * slog-mock is available free of charge under the terms of the MIT
8 * License. You are free to redistribute and/or modify it under those
9 * terms. It is distributed in the hopes that it will be useful, but
10 * WITHOUT ANY WARRANTY. See the LICENSE file for more details.
11 *
12 */
13
14#![deny(missing_debug_implementations, missing_docs)]
15#![forbid(unsafe_code)]
16
17//! Inner crate to implement procedural macros for `slog-mock`.
18
19extern crate proc_macro;
20
21#[macro_use]
22extern crate quote;
23
24#[macro_use]
25extern crate syn;
26
27mod slog_call;
28
29use self::slog_call::SlogCall;
30use proc_macro::TokenStream;
31
32fn slog_unused(input: TokenStream) -> TokenStream {
33    let SlogCall {
34        logger,
35        message,
36        format_args,
37        context_keys,
38        context_values,
39    } = parse_macro_input!(input as SlogCall);
40
41    let expanded = quote! {{
42        let _ = #logger;
43        let _ = #message;
44
45        #(
46            let _ = #format_args;
47        )*
48
49        #(
50            let _ = #context_keys;
51        )*
52
53        #(
54            let _ = #context_values;
55        )*
56
57        ()
58    }};
59
60    TokenStream::from(expanded)
61}
62
63/// Dummy logging macro, mimics `slog::crit!`.
64#[proc_macro]
65pub fn crit(input: TokenStream) -> TokenStream {
66    slog_unused(input)
67}
68
69/// Dummy logging macro, mimics `slog::error!`.
70#[proc_macro]
71pub fn error(input: TokenStream) -> TokenStream {
72    slog_unused(input)
73}
74
75/// Dummy logging macro, mimics `slog::warn!`.
76#[proc_macro]
77pub fn warn(input: TokenStream) -> TokenStream {
78    slog_unused(input)
79}
80
81/// Dummy logging macro, mimics `slog::info!`.
82#[proc_macro]
83pub fn info(input: TokenStream) -> TokenStream {
84    slog_unused(input)
85}
86
87/// Dummy logging macro, mimics `slog::debug!`.
88#[proc_macro]
89pub fn debug(input: TokenStream) -> TokenStream {
90    slog_unused(input)
91}
92
93/// Dummy logging macro, mimics `slog::trace!`.
94#[proc_macro]
95pub fn trace(input: TokenStream) -> TokenStream {
96    slog_unused(input)
97}
slog_mock_proc_macros/lib.rs

slog_mock_proc_macros/
lib.rs
