ferment-sys 0.2.14

Syntax tree morphing of FFI-compatible stuff
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

use std::fmt::{Display, Formatter};
use proc_macro2::{Ident, TokenStream};
use quote::{quote, ToTokens};
use syn::{Attribute, Generics, ItemFn, ItemTrait, Path, TypeBareFn};
use crate::composable::{CfgAttributes, FnSignatureContext};
use crate::kind::MixinKind;
use crate::ext::{AsType, ToPath};
use crate::presentable::NameTreeContext;

#[derive(Clone, Debug)]
pub enum TypeContext {
    Enum {
        ident: Ident,
        generics: Generics,
        attrs: Vec<Attribute>,
    },
    EnumVariant {
        parent: Box<TypeContext>,
        ident: Ident,
        variant_ident: Ident,
        attrs: Vec<Attribute>
    },
    Struct {
        ident: Ident,
        generics: Generics,
        attrs: Vec<Attribute>,
    },
    Fn {
        parent: Option<Box<TypeContext>>,
        path: Path,
        sig_context: FnSignatureContext,
        attrs: Vec<Attribute>,
    },
    Trait {
        path: Path,
        attrs: Vec<Attribute>,
    },
    Impl {
        path: Path,
        trait_: Option<Path>,
        attrs: Vec<Attribute>,
    },
    Mixin {
        mixin_kind: MixinKind,
        attrs: Vec<Attribute>,
    }
}

impl TypeContext {
    pub(crate) fn attrs(&self) -> &Vec<Attribute> {
        match self {
            TypeContext::Mixin { attrs, .. } |
            TypeContext::Enum { attrs, .. } |
            TypeContext::EnumVariant { attrs, .. } |
            TypeContext::Struct { attrs, .. } |
            TypeContext::Fn { attrs, .. } |
            TypeContext::Trait { attrs, .. } |
            TypeContext::Impl { attrs, .. } => attrs,
        }
    }

    pub fn r#struct(ident: &Ident, attrs: Vec<Attribute>, generics: Generics) -> Self {
        Self::Struct { ident: ident.clone(), attrs, generics }
    }
    pub fn struct_ident(ident: Ident) -> Self {
        Self::Struct { ident, attrs: vec![], generics: Generics::default() }
    }
    pub fn r#enum(ident: &Ident, attrs: Vec<Attribute>, generics: Generics) -> Self {
        Self::Enum { ident: ident.clone(), attrs, generics }
    }

    pub fn r#impl(path: Path, trait_: Option<Path>, attrs: Vec<Attribute>) -> Self {
        Self::Impl { path, attrs, trait_ }
    }
    pub fn mixin(kind: &MixinKind, attrs: Vec<Attribute>) -> Self {
        Self::Mixin { mixin_kind: kind.clone(), attrs }
    }
    pub fn mod_fn(path: Path, item: &ItemFn) -> Self {
        Self::Fn { parent: None, path, sig_context: FnSignatureContext::ModFn(item.clone()), attrs: item.attrs.cfg_attributes() }
    }
    pub fn callback(path: Path, ident: &Ident, item: &TypeBareFn, attrs: &Vec<Attribute>) -> Self {
        Self::Fn { parent: None, path, sig_context: FnSignatureContext::Bare(ident.clone(), item.clone()), attrs: attrs.cfg_attributes() }
    }
    pub fn r#trait(item: &ItemTrait) -> Self {
        Self::Trait { path: item.ident.to_path(), attrs: item.attrs.cfg_attributes() }
    }
}
impl Display for TypeContext {
    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
        f.write_str(match self {
            TypeContext::Enum { ident, .. } |
            TypeContext::Struct { ident, .. } =>
                ident.to_string(),
            TypeContext::EnumVariant { ident, variant_ident, .. } =>
                format!("{ident}_{variant_ident}"),
            TypeContext::Fn { path, .. } |
            TypeContext::Trait { path, .. } =>
                path.to_token_stream().to_string(),
            TypeContext::Impl { path, .. } =>
                path.to_token_stream().to_string(),
            TypeContext::Mixin { mixin_kind: MixinKind::Generic(kind), .. } =>
                kind.to_token_stream().to_string(),
            TypeContext::Mixin { mixin_kind: MixinKind::Bounds(model), .. } =>
                model.to_string(),
        }.as_str())
    }
}
impl ToTokens for TypeContext {
    fn to_tokens(&self, tokens: &mut TokenStream) {
        match self {
            TypeContext::Enum { ident, .. } |
            TypeContext::Struct { ident, .. } =>
                ident.to_tokens(tokens),
            TypeContext::EnumVariant { ident, variant_ident, .. } =>
                quote!(#ident::#variant_ident).to_tokens(tokens),
            TypeContext::Fn { path, .. } |
            TypeContext::Trait { path, .. } |
            TypeContext::Impl { path, .. } =>
                path.to_tokens(tokens),
            TypeContext::Mixin { mixin_kind: MixinKind::Generic(kind), .. } =>
                kind.to_tokens(tokens),
            TypeContext::Mixin { mixin_kind: MixinKind::Bounds(model), .. } =>
                model.as_type().to_tokens(tokens),
        }    }
}
impl NameTreeContext for TypeContext {
    fn join_fn(&self, path: Path, sig_context: FnSignatureContext, attrs: Vec<Attribute>) -> Self {
        match self {
            TypeContext::Trait { .. } | TypeContext::Impl { .. } =>
                TypeContext::Fn { path, sig_context, attrs, parent: Some(Box::new(self.clone())) },
            _ => panic!()
        }
    }

    fn join_variant(&self, ident: Ident, variant_ident: Ident, attrs: Vec<Attribute>) -> Self {
        match self {
            TypeContext::Enum { .. } =>
                TypeContext::EnumVariant { attrs, ident, variant_ident, parent: Box::new(self.clone()) },
            _ => panic!()
        }
    }
}