miette/eyreish/
context.rs

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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
use super::error::{ContextError, ErrorImpl};
use super::{Report, WrapErr};
use core::fmt::{self, Debug, Display, Write};

use std::error::Error as StdError;

use crate::{Diagnostic, LabeledSpan};

mod ext {
    use super::*;

    pub trait Diag {
        #[cfg_attr(track_caller, track_caller)]
        fn ext_report<D>(self, msg: D) -> Report
        where
            D: Display + Send + Sync + 'static;
    }

    impl<E> Diag for E
    where
        E: Diagnostic + Send + Sync + 'static,
    {
        fn ext_report<D>(self, msg: D) -> Report
        where
            D: Display + Send + Sync + 'static,
        {
            Report::from_msg(msg, self)
        }
    }

    impl Diag for Report {
        fn ext_report<D>(self, msg: D) -> Report
        where
            D: Display + Send + Sync + 'static,
        {
            self.wrap_err(msg)
        }
    }
}

impl<T, E> WrapErr<T, E> for Result<T, E>
where
    E: ext::Diag + Send + Sync + 'static,
{
    fn wrap_err<D>(self, msg: D) -> Result<T, Report>
    where
        D: Display + Send + Sync + 'static,
    {
        match self {
            Ok(t) => Ok(t),
            Err(e) => Err(e.ext_report(msg)),
        }
    }

    fn wrap_err_with<D, F>(self, msg: F) -> Result<T, Report>
    where
        D: Display + Send + Sync + 'static,
        F: FnOnce() -> D,
    {
        match self {
            Ok(t) => Ok(t),
            Err(e) => Err(e.ext_report(msg())),
        }
    }

    fn context<D>(self, msg: D) -> Result<T, Report>
    where
        D: Display + Send + Sync + 'static,
    {
        self.wrap_err(msg)
    }

    fn with_context<D, F>(self, msg: F) -> Result<T, Report>
    where
        D: Display + Send + Sync + 'static,
        F: FnOnce() -> D,
    {
        self.wrap_err_with(msg)
    }
}

impl<D, E> Debug for ContextError<D, E>
where
    D: Display,
    E: Debug,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Error")
            .field("msg", &Quoted(&self.msg))
            .field("source", &self.error)
            .finish()
    }
}

impl<D, E> Display for ContextError<D, E>
where
    D: Display,
{
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        Display::fmt(&self.msg, f)
    }
}

impl<D, E> StdError for ContextError<D, E>
where
    D: Display,
    E: StdError + 'static,
{
    fn source(&self) -> Option<&(dyn StdError + 'static)> {
        Some(&self.error)
    }
}

impl<D> StdError for ContextError<D, Report>
where
    D: Display,
{
    fn source(&self) -> Option<&(dyn StdError + 'static)> {
        unsafe { Some(ErrorImpl::error(self.error.inner.by_ref())) }
    }
}

impl<D, E> Diagnostic for ContextError<D, E>
where
    D: Display,
    E: Diagnostic + 'static,
{
    fn code<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
        self.error.code()
    }

    fn severity(&self) -> Option<crate::Severity> {
        self.error.severity()
    }

    fn help<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
        self.error.help()
    }

    fn url<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
        self.error.url()
    }

    fn labels<'a>(&'a self) -> Option<Box<dyn Iterator<Item = LabeledSpan> + 'a>> {
        self.error.labels()
    }

    fn source_code(&self) -> Option<&dyn crate::SourceCode> {
        self.error.source_code()
    }

    fn related<'a>(&'a self) -> Option<Box<dyn Iterator<Item = &'a dyn Diagnostic> + 'a>> {
        self.error.related()
    }
}

impl<D> Diagnostic for ContextError<D, Report>
where
    D: Display,
{
    fn code<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
        unsafe { ErrorImpl::diagnostic(self.error.inner.by_ref()).code() }
    }

    fn severity(&self) -> Option<crate::Severity> {
        unsafe { ErrorImpl::diagnostic(self.error.inner.by_ref()).severity() }
    }

    fn help<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
        unsafe { ErrorImpl::diagnostic(self.error.inner.by_ref()).help() }
    }

    fn url<'a>(&'a self) -> Option<Box<dyn Display + 'a>> {
        unsafe { ErrorImpl::diagnostic(self.error.inner.by_ref()).url() }
    }

    fn labels<'a>(&'a self) -> Option<Box<dyn Iterator<Item = LabeledSpan> + 'a>> {
        unsafe { ErrorImpl::diagnostic(self.error.inner.by_ref()).labels() }
    }

    fn source_code(&self) -> Option<&dyn crate::SourceCode> {
        self.error.source_code()
    }

    fn related<'a>(&'a self) -> Option<Box<dyn Iterator<Item = &'a dyn Diagnostic> + 'a>> {
        self.error.related()
    }
}

struct Quoted<D>(D);

impl<D> Debug for Quoted<D>
where
    D: Display,
{
    fn fmt(&self, formatter: &mut fmt::Formatter<'_>) -> fmt::Result {
        formatter.write_char('"')?;
        Quoted(&mut *formatter).write_fmt(format_args!("{}", self.0))?;
        formatter.write_char('"')?;
        Ok(())
    }
}

impl Write for Quoted<&mut fmt::Formatter<'_>> {
    fn write_str(&mut self, s: &str) -> fmt::Result {
        Display::fmt(&s.escape_debug(), self.0)
    }
}

pub(crate) mod private {
    use super::*;

    pub trait Sealed {}

    impl<T, E> Sealed for Result<T, E> where E: ext::Diag {}
    impl<T> Sealed for Option<T> {}
}