esdl 0.6.0

Event-sourcing Schema Definition Language parser
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

use nom::{
    branch::alt,
    character::complete::{char, space0},
    combinator::{map, opt, value},
    sequence::{delimited, pair},
};
use nom_supreme::tag::complete::tag;

use super::{
    event::Field, ident::parse_camel_ident, parsers::keyword_ident_structure, IResult, Span,
};

#[derive(Clone, Debug, PartialEq, Eq)]
pub struct CustomType<'i> {
    pub ident: Span<'i>,
    pub fields: Vec<Field<'i>>,
}

pub fn parse_custom_type(input: Span) -> IResult<Span, CustomType<'_>> {
    map(keyword_ident_structure("type"), |(ident, fields)| {
        CustomType { ident, fields }
    })(input)
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum Type<'i> {
    Single(OptionalOrRequiredType<'i>),
    Array {
        inner: OptionalOrRequiredType<'i>,
        optional: bool,
    },
}

pub fn parse_type(input: Span) -> IResult<Span, Type<'_>> {
    let single_type_parser = map(parse_optional_or_required_type, Type::Single);
    let array_type_parser = map(
        pair(
            delimited(
                pair(tag("["), space0),
                parse_optional_or_required_type,
                pair(space0, tag("]")),
            ),
            opt(char('?')),
        ),
        |(ty, optional)| Type::Array {
            inner: ty,
            optional: optional.is_some(),
        },
    );
    alt((single_type_parser, array_type_parser))(input)
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum ScalarOrUserType<'i> {
    Scalar(Scalar),
    UserDefined(Span<'i>),
}

pub fn parse_scalar_or_user_type(input: Span) -> IResult<Span, ScalarOrUserType<'_>> {
    let scalar_parser = map(parse_scalar, ScalarOrUserType::Scalar);
    let user_defined_parser = map(parse_camel_ident, |ident| {
        ScalarOrUserType::UserDefined(ident)
    });

    alt((scalar_parser, user_defined_parser))(input)
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum OptionalOrRequiredType<'i> {
    Optional(ScalarOrUserType<'i>),
    Required(ScalarOrUserType<'i>),
}

pub fn parse_optional_or_required_type(input: Span) -> IResult<Span, OptionalOrRequiredType<'_>> {
    let mut optional_or_required_parser = map(
        pair(parse_scalar_or_user_type, opt(char('?'))),
        |(scalar_or_user_type, optional)| {
            if optional.is_some() {
                OptionalOrRequiredType::Optional(scalar_or_user_type)
            } else {
                OptionalOrRequiredType::Required(scalar_or_user_type)
            }
        },
    );

    optional_or_required_parser(input)
}

#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum Scalar {
    String,
    /// 32-bit signed integer
    Int,
    /// 64-bit signed integer
    Long,
    /// 32-bit float
    Float,
    /// 64-bit float
    Double,
    /// Binary value
    Bool,
    /// Sequence of 8-bit unsigned bytes
    Bytes,
}

pub fn parse_scalar_string(input: Span) -> IResult<Span, Scalar> {
    value(Scalar::String, tag("String"))(input)
}

pub fn parse_scalar_int(input: Span) -> IResult<Span, Scalar> {
    value(Scalar::Int, tag("Int"))(input)
}

pub fn parse_scalar_uint(input: Span) -> IResult<Span, Scalar> {
    value(Scalar::Long, tag("Long"))(input)
}

pub fn parse_scalar_float(input: Span) -> IResult<Span, Scalar> {
    value(Scalar::Float, tag("Float"))(input)
}

pub fn parse_scalar_double(input: Span) -> IResult<Span, Scalar> {
    value(Scalar::Double, tag("Double"))(input)
}

pub fn parse_scalar_bool(input: Span) -> IResult<Span, Scalar> {
    value(Scalar::Bool, tag("Bool"))(input)
}

pub fn parse_scalar_bytes(input: Span) -> IResult<Span, Scalar> {
    value(Scalar::Bytes, tag("Bytes"))(input)
}

pub fn parse_scalar(input: Span) -> IResult<Span, Scalar> {
    alt((
        parse_scalar_string,
        parse_scalar_int,
        parse_scalar_uint,
        parse_scalar_float,
        parse_scalar_double,
        parse_scalar_bool,
        parse_scalar_bytes,
    ))(input)
}