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

use crate::config::errors::ConfigError;
use crate::config::parser::*;
use miette::{SourceOffset, SourceSpan};
use serde::de::DeserializeOwned;

pub use crate::format::Format;

fn create_span(content: &str, line: usize, column: usize) -> SourceSpan {
    let offset = SourceOffset::from_location(content, line, column).offset();
    let length = 0;

    (offset, length).into()
}

impl Format {
    /// Detects a format from a provided value, either a file path or URL, by
    /// checking for a supported file extension.
    pub fn detect(value: &str) -> Result<Format, ConfigError> {
        let mut available: Vec<&str> = vec![];

        #[cfg(feature = "json")]
        {
            available.push("JSON");

            if value.ends_with(".json") {
                return Ok(Format::Json);
            }
        }

        #[cfg(feature = "toml")]
        {
            available.push("TOML");

            if value.ends_with(".toml") {
                return Ok(Format::Toml);
            }
        }

        #[cfg(feature = "yaml")]
        {
            available.push("YAML");

            if value.ends_with(".yaml") || value.ends_with(".yml") {
                return Ok(Format::Yaml);
            }
        }

        Err(ConfigError::UnsupportedFormat(
            value.to_owned(),
            available.join(", "),
        ))
    }

    /// Parse the provided content in the defined format into a partial configuration struct.
    /// On failure, will attempt to extract the path to the problematic field and source
    /// code spans (for use in `miette`).
    pub fn parse<D>(&self, content: String, _location: &str) -> Result<D, ParserError>
    where
        D: DeserializeOwned,
    {
        let data: D = match self {
            Format::None => {
                unreachable!();
            }
            #[cfg(feature = "json")]
            Format::Json => {
                let content = if content.is_empty() {
                    "{}".to_owned()
                } else {
                    content
                };

                let de = &mut serde_json::Deserializer::from_str(&content);

                serde_path_to_error::deserialize(de).map_err(|error| ParserError {
                    // content: NamedSource::new(location, content.to_owned()),
                    content: content.to_owned(),
                    path: error.path().to_string(),
                    span: Some(create_span(
                        &content,
                        error.inner().line(),
                        error.inner().column(),
                    )),
                    message: error.inner().to_string(),
                })?
            }

            #[cfg(feature = "toml")]
            Format::Toml => {
                let de = toml::Deserializer::new(&content);

                serde_path_to_error::deserialize(de).map_err(|error| ParserError {
                    // content: NamedSource::new(location, content.to_owned()),
                    content: content.to_owned(),
                    path: error.path().to_string(),
                    span: error.inner().span().map(|s| s.into()),
                    message: error.inner().message().to_owned(),
                })?
            }

            #[cfg(feature = "yaml")]
            Format::Yaml => {
                use serde::de::IntoDeserializer;

                // First pass, convert string to value
                let de = serde_yaml::Deserializer::from_str(&content);
                let mut result: serde_yaml::Value =
                    serde_path_to_error::deserialize(de).map_err(|error| ParserError {
                        // content: NamedSource::new(location, content.to_owned()),
                        content: content.to_owned(),
                        path: error.path().to_string(),
                        span: error
                            .inner()
                            .location()
                            .map(|s| create_span(&content, s.line(), s.column())),
                        message: error.inner().to_string(),
                    })?;

                // Applies anchors/aliases/references
                result.apply_merge().map_err(|error| ParserError {
                    // content: NamedSource::new(location, content.to_owned()),
                    content: content.to_owned(),
                    path: String::new(),
                    span: error.location().map(|s| (s.line(), s.column()).into()),
                    message: error.to_string(),
                })?;

                // Second pass, convert value to struct
                let de = result.into_deserializer();

                serde_path_to_error::deserialize(de).map_err(|error| ParserError {
                    // content: NamedSource::new(location, content.to_owned()),
                    content: content.to_owned(),
                    path: error.path().to_string(),
                    span: error
                        .inner()
                        .location()
                        .map(|s| create_span(&content, s.line(), s.column())),
                    message: error.inner().to_string(),
                })?
            }
        };

        Ok(data)
    }
}