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
130
131
132
133
134
135
136
137
138
139
140

// Copyright (C) 2019-2024 Aleo Systems Inc.
// This file is part of the Leo library.

// The Leo library is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// The Leo library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with the Leo library. If not, see <https://www.gnu.org/licenses/>.

/// A macro that given an enum, exit code mask, error code string prefix,
/// and error methods generated through a DSL creates and generates errors
/// with a unique error code.
#[macro_export]
macro_rules! create_messages {
    (@step $code:expr,) => {
        #[inline(always)]
        // Returns the number of unique exit codes that this error type can take on.
        pub fn num_exit_codes() -> i32 {
            $code
        }
    };
    ($(#[$error_type_docs:meta])* $type_:ident, code_mask: $code_mask:expr, code_prefix: $code_prefix:expr, $($(#[$docs:meta])* @$formatted_or_backtraced_list:ident $names:ident { args: ($($arg_names:ident: $arg_types:ty$(,)?)*), msg: $messages:expr, help: $helps:expr, })*) => {
        #[allow(unused_imports)] // Allow unused for errors that only use formatted or backtraced errors.
        use $crate::{Backtraced, Formatted, LeoMessageCode};

        use backtrace::Backtrace;

        // Generates the enum and implements from FormattedError and BacktracedErrors.
        #[derive(Clone, Debug, Error)]
        $(#[$error_type_docs])*
        pub enum $type_ {
            #[error(transparent)]
            Formatted(#[from] Formatted),

	        #[error(transparent)]
            Backtraced(#[from] Backtraced),
        }

        /// Implements the trait for LeoError Codes.
        impl LeoMessageCode for $type_ {
            #[inline(always)]
            fn exit_code(&self) -> i32 {
                match self {
                    Self::Formatted(formatted) => formatted.exit_code(),
                    Self::Backtraced(backtraced) => backtraced.exit_code()
                }
            }

            #[inline(always)]
            fn error_code(&self) -> String {
                match self {
                    Self::Formatted(formatted) => formatted.error_code(),
                    Self::Backtraced(backtraced) => backtraced.error_code()
                }
            }

            #[inline(always)]
            fn warning_code(&self) -> String {
                match self {
                    Self::Formatted(formatted) => formatted.warning_code(),
                    Self::Backtraced(backtraced) => backtraced.warning_code()
                }
            }

            #[inline(always)]
            fn code_mask() -> i32 {
                $code_mask
            }

            #[inline(always)]
            fn message_type() -> String {
                $code_prefix.to_string()
            }

            #[inline(always)]
            fn is_error() -> bool {
                stringify!($type_).contains("Error")
            }
        }


        // Steps over the list of functions with an initial code of 0.
        impl $type_ {
            create_messages!(@step 0i32, $(($(#[$docs])* $formatted_or_backtraced_list, $names($($arg_names: $arg_types,)*), $messages, $helps),)*);
        }
    };
    // Matches the function if it is a formatted message.
    (@step $code:expr, ($(#[$error_func_docs:meta])* formatted, $name:ident($($arg_names:ident: $arg_types:ty,)*), $message:expr, $help:expr), $(($(#[$docs:meta])* $formatted_or_backtraced_tail:ident, $names:ident($($tail_arg_names:ident: $tail_arg_types:ty,)*), $messages:expr, $helps:expr),)*) => {
        // Formatted errors always takes a span.
        $(#[$error_func_docs])*
        // Expands additional arguments for the error defining function.
        pub fn $name($($arg_names: $arg_types,)* span: leo_span::Span) -> Self {
            Self::Formatted(
                Formatted::new_from_span(
                    $message,
                    $help,
                    $code + Self::code_mask(),
                    Self::code_identifier(),
                    Self::message_type(),
                    Self::is_error(),
                    span,
                    // Each function always generates its own backtrace for backtrace clarity to originate from the error function.
                    Backtrace::new(),
                )
            )
        }

        // Steps the code value by one and calls on the rest of the functions.
        create_messages!(@step $code + 1i32, $(($(#[$docs])* $formatted_or_backtraced_tail, $names($($tail_arg_names: $tail_arg_types,)*), $messages, $helps),)*);
    };
    // matches the function if it is a backtraced message.
    (@step $code:expr, ($(#[$error_func_docs:meta])* backtraced, $name:ident($($arg_names:ident: $arg_types:ty,)*), $message:expr, $help:expr), $(($(#[$docs:meta])* $formatted_or_backtraced_tail:ident, $names:ident($($tail_arg_names:ident: $tail_arg_types:ty,)*), $messages:expr, $helps:expr),)*) => {
        $(#[$error_func_docs])*
        // Expands additional arguments for the error defining function.
        pub fn $name($($arg_names: $arg_types,)*) -> Self {
            Self::Backtraced(
                Backtraced::new_from_backtrace(
                    $message,
                    $help,
                    $code + Self::code_mask(),
                    Self::code_identifier(),
                    Self::message_type(),
                    Self::is_error(),
                    // Each function always generates its own backtrace for backtrace clarity to originate from the error function.
                    Backtrace::new(),
                )
            )
        }

        // Steps the code value by one and calls on the rest of the functions.
        create_messages!(@step $code + 1i32, $(($(#[$docs])* $formatted_or_backtraced_tail, $names($($tail_arg_names: $tail_arg_types,)*), $messages, $helps),)*);
    };
}