memtable-macros 0.2.0

Macro library that provides ability to derive typed tables and generate tables compile-time.
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

use super::{TableColumn, TableMode};
use darling::ast::Style;
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
use syn::{parse_quote, Generics, Ident, LitInt, LitStr, Path, Type};
use voca_rs::case;

pub fn make_inner_table_type(
    root: &Path,
    mode: TableMode,
    table_data_name: &Ident,
    generics: &Generics,
    col_cnt: usize,
) -> Type {
    let (_, ty_generics, _) = generics.split_for_impl();
    let col_cnt: LitInt = parse_quote!(#col_cnt);

    match mode {
        TableMode::Dynamic => {
            parse_quote!(#root::DynamicTable<#table_data_name #ty_generics>)
        }
        TableMode::FixedColumn => {
            parse_quote!(#root::FixedColumnTable<#table_data_name #ty_generics, #col_cnt>)
        }
        TableMode::Fixed { rows } => {
            let row_cnt: LitInt = parse_quote!(#rows);
            parse_quote!(#root::FixedTable<#table_data_name #ty_generics, #row_cnt, #col_cnt>)
        }
    }
}

pub fn make_variant_idents(columns: &[&TableColumn]) -> Vec<Ident> {
    columns
        .iter()
        .enumerate()
        .map(|(idx, col)| {
            let name = if let Some(name) = col.name.as_ref() {
                case::pascal_case(&name)
            } else if let Some(name) = col.ident.as_ref() {
                case::pascal_case(&name.to_string())
            } else {
                format!("_{}", idx)
            };
            format_ident!("{}", name)
        })
        .collect()
}

pub fn make_variant_types(columns: &[&TableColumn]) -> Vec<Type> {
    columns.iter().map(|col| col.ty.clone()).collect()
}

pub fn make_column_indexes(columns: &[&TableColumn]) -> Vec<syn::Index> {
    (0..columns.len()).map(syn::Index::from).collect()
}

pub fn make_snake_idents(columns: &[&TableColumn]) -> Vec<Ident> {
    columns
        .iter()
        .enumerate()
        .map(|(idx, col)| {
            let name = if let Some(name) = col.name.as_ref() {
                case::snake_case(&name)
            } else if let Some(name) = col.ident.as_ref() {
                case::snake_case(&name.to_string())
            } else {
                format!("_{}", idx)
            };
            format_ident!("{}", name)
        })
        .collect()
}

pub fn make_field_tokens(columns: &[&TableColumn]) -> Vec<TokenStream> {
    columns
        .iter()
        .enumerate()
        .map(|(idx, col)| {
            col.ident.as_ref().map(|x| quote!(#x)).unwrap_or_else(|| {
                let idx = syn::Index::from(idx);
                quote!(#idx)
            })
        })
        .collect()
}

pub struct VariantMethodIdents {
    pub is_variant: Vec<Ident>,
    pub as_variant: Vec<Ident>,
    pub as_mut_variant: Vec<Ident>,
    pub into_variant: Vec<Ident>,
}

pub fn make_variant_method_idents(style: Style, columns: &[&TableColumn]) -> VariantMethodIdents {
    let method_names: Vec<(Ident, Ident, Ident, Ident)> = make_snake_idents(columns)
        .into_iter()
        .map(|suffix| {
            if style.is_struct() {
                (
                    format_ident!("is_{}", suffix),
                    format_ident!("as_{}", suffix),
                    format_ident!("as_mut_{}", suffix),
                    format_ident!("into_{}", suffix),
                )
            } else {
                (
                    format_ident!("is{}", suffix),
                    format_ident!("as{}", suffix),
                    format_ident!("as_mut{}", suffix),
                    format_ident!("into{}", suffix),
                )
            }
        })
        .collect();
    let (is_variant, as_variant, as_mut_variant, into_variant) = method_names.into_iter().fold(
        (Vec::new(), Vec::new(), Vec::new(), Vec::new()),
        |(mut is_acc, mut as_acc, mut as_mut_acc, mut into_acc),
         (is_name, as_name, as_mut_name, into_name)| {
            is_acc.push(is_name);
            as_acc.push(as_name);
            as_mut_acc.push(as_mut_name);
            into_acc.push(into_name);
            (is_acc, as_acc, as_mut_acc, into_acc)
        },
    );

    VariantMethodIdents {
        is_variant,
        as_variant,
        as_mut_variant,
        into_variant,
    }
}

pub fn make_column_names(
    columns: &[&TableColumn],
    map_name: impl Fn(&str) -> String,
) -> Vec<String> {
    columns
        .iter()
        .enumerate()
        .map(|(idx, col)| {
            if let Some(name) = col.name.as_ref() {
                map_name(&name)
            } else if let Some(name) = col.ident.as_ref() {
                map_name(&name.to_string())
            } else {
                idx.to_string()
            }
        })
        .collect()
}

#[inline]
pub fn bug_str() -> LitStr {
    let msg = concat!(
        "BUG: Typed row missing cell data! This should never happen! ",
        "Please report this to https://github.com/chipsenkbeil/memtable-rs/issues",
    );

    parse_quote!(#msg)
}