serde_valid_derive 2.0.2

JSON Schema based validation tool using serde.
Documentation 
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

mod meta_list;
mod meta_name_value;
mod meta_path;

use crate::{
    attribute::{
        common::message_format::{default_message_format, extract_custom_message_format},
        MetaListStructValidation, MetaNameValueStructValidation, MetaPathStructValidation,
        Validator,
    },
    types::SingleIdentPath,
    warning::WithWarnings,
};
use quote::quote;
use std::str::FromStr;

use self::{
    meta_list::extract_variant_validator_from_meta_list,
    meta_name_value::extract_variant_validator_from_meta_name_value,
    meta_path::extract_variant_validator_from_meta_path,
};

pub fn extract_variant_validator(
    attribute: &syn::Attribute,
) -> Result<WithWarnings<Validator>, crate::Errors> {
    match &attribute.meta {
        syn::Meta::Path(_) => Ok(WithWarnings::new(quote!())),
        syn::Meta::List(list) => inner_extract_variant_validator(attribute, list),
        syn::Meta::NameValue(name_value) => {
            Err(vec![crate::Error::validate_meta_name_value_not_supported(
                name_value,
            )])
        }
    }
}

fn inner_extract_variant_validator(
    attribute: &syn::Attribute,
    meta_list: &syn::MetaList,
) -> Result<WithWarnings<Validator>, crate::Errors> {
    let mut errors = vec![];
    let nested = meta_list
        .parse_args_with(crate::types::CommaSeparatedMetas::parse_terminated)
        .map_err(|error| {
            vec![crate::Error::validate_attribute_parse_error(
                attribute, &error,
            )]
        })?;

    let WithWarnings {
        data: message_format,
        mut warnings,
    } = match nested.len() {
        0 => Err(vec![crate::Error::struct_validation_type_required(
            attribute,
        )])?,
        1 => None,
        2 => match extract_custom_message_format(&nested[1]) {
            Ok(custom_message) => {
                if nested[0].path().is_ident("custom") {
                    errors.push(
                        crate::Error::validate_custom_does_not_support_custom_message(&nested[1]),
                    );
                    None
                } else {
                    Some(custom_message)
                }
            }
            Err(message_fn_errors) => {
                errors.extend(message_fn_errors);
                None
            }
        },
        _ => {
            for meta in nested.iter().skip(2) {
                errors.push(crate::Error::too_many_list_items(meta));
            }
            None
        }
    }
    .unwrap_or_else(|| WithWarnings::new(default_message_format()));

    let meta = &nested[0];
    let validation_path = match meta {
        syn::Meta::Path(path) => path,
        syn::Meta::List(list) => &list.path,
        syn::Meta::NameValue(name_value) => &name_value.path,
    };

    let validation_name = SingleIdentPath::new(validation_path)
        .map_err(|error| vec![error])?
        .ident()
        .to_string();
    let validator = match (
        MetaPathStructValidation::from_str(&validation_name),
        MetaListStructValidation::from_str(&validation_name),
        MetaNameValueStructValidation::from_str(&validation_name),
        meta,
    ) {
        (Ok(validation_type), _, _, syn::Meta::Path(validation)) => {
            extract_variant_validator_from_meta_path(validation_type, validation, message_format)
        }

        (_, Ok(validation_type), _, syn::Meta::List(validation)) => {
            extract_variant_validator_from_meta_list(validation_type, validation, message_format)
        }

        (_, _, Ok(validation_type), syn::Meta::NameValue(validation)) => {
            extract_variant_validator_from_meta_name_value(
                validation_type,
                validation,
                message_format,
            )
        }

        (Ok(_), _, _, _) => Err(vec![crate::Error::meta_path_validation_need_value(
            validation_path,
            &validation_name,
        )]),

        (_, Ok(_), _, _) => Err(vec![crate::Error::meta_list_validation_need_value(
            validation_path,
            &validation_name,
        )]),

        (_, _, Ok(_), _) => Err(vec![crate::Error::meta_name_value_validation_need_value(
            validation_path,
            &validation_name,
        )]),

        _ => Err(vec![crate::Error::struct_validation_type_unknown(
            validation_path,
            &validation_name,
        )]),
    }
    .map(|validator| {
        warnings.extend(validator.warnings);
        validator.data
    });

    match validator {
        Ok(validator) => {
            if errors.is_empty() {
                Ok(WithWarnings {
                    data: validator,
                    warnings,
                })
            } else {
                Err(errors)
            }
        }
        Err(validator_errors) => {
            errors.extend(validator_errors);
            Err(errors)
        }
    }
}