aster 0.1.3

A libsyntax ast builder
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
163
164
165
166
167
168
169
170
171
172
173
174
175
176

use syntax::ast;
use syntax::codemap::{DUMMY_SP, Span};
use syntax::owned_slice::OwnedSlice;
use syntax::ptr::P;

use ident::ToIdent;
use invoke::{Invoke, Identity};
use lifetime::{IntoLifetime, IntoLifetimeDef, LifetimeDefBuilder};
use name::ToName;
use path::IntoPath;

//////////////////////////////////////////////////////////////////////////////

pub struct TyParamBuilder<F=Identity> {
    callback: F,
    span: Span,
    id: ast::Ident,
    bounds: Vec<ast::TyParamBound>,
    default: Option<P<ast::Ty>>,
}

impl TyParamBuilder {
    pub fn new<I>(id: I) -> Self
        where I: ToIdent,
    {
        TyParamBuilder::new_with_callback(id, Identity)
    }

    pub fn from_ty_param(ty_param: ast::TyParam) -> Self {
        TyParamBuilder::from_ty_param_with_callback(Identity, ty_param)
    }
}

impl<F> TyParamBuilder<F>
    where F: Invoke<ast::TyParam>,
{
    pub fn new_with_callback<I>(id: I, callback: F) -> Self
        where I: ToIdent
    {
        TyParamBuilder {
            callback: callback,
            span: DUMMY_SP,
            id: id.to_ident(),
            bounds: Vec::new(),
            default: None,
        }
    }

    pub fn from_ty_param_with_callback(callback: F, ty_param: ast::TyParam) -> Self {
        TyParamBuilder {
            callback: callback,
            span: ty_param.span,
            id: ty_param.ident,
            bounds: ty_param.bounds.into_vec(),
            default: ty_param.default,
        }
    }

    pub fn span(mut self, span: Span) -> Self {
        self.span = span;
        self
    }

    pub fn with_default(mut self, ty: P<ast::Ty>) -> Self {
        self.default = Some(ty);
        self
    }

    pub fn with_trait_bound(mut self, trait_ref: ast::PolyTraitRef) -> Self {
        self.bounds.push(ast::TyParamBound::TraitTyParamBound(
            trait_ref,
            ast::TraitBoundModifier::None,
        ));
        self
    }

    pub fn trait_bound<P>(self, path: P) -> PolyTraitRefBuilder<Self>
        where P: IntoPath,
    {
        PolyTraitRefBuilder::new_with_callback(path, self)
    }

    pub fn lifetime_bound<L>(mut self, lifetime: L) -> Self
        where L: IntoLifetime,
    {
        let lifetime = lifetime.into_lifetime();

        self.bounds.push(ast::TyParamBound::RegionTyParamBound(lifetime));
        self
    }

    pub fn build(self) -> F::Result {
        self.callback.invoke(ast::TyParam {
            ident: self.id,
            id: ast::DUMMY_NODE_ID,
            bounds: OwnedSlice::from_vec(self.bounds),
            default: self.default,
            span: self.span,
        })
    }
}

impl<F> Invoke<ast::PolyTraitRef> for TyParamBuilder<F>
    where F: Invoke<ast::TyParam>,
{
    type Result = Self;

    fn invoke(self, trait_ref: ast::PolyTraitRef) -> Self {
        self.with_trait_bound(trait_ref)
    }
}

//////////////////////////////////////////////////////////////////////////////

pub struct PolyTraitRefBuilder<F> {
    callback: F,
    span: Span,
    trait_ref: ast::TraitRef,
    lifetimes: Vec<ast::LifetimeDef>,
}

impl<F> PolyTraitRefBuilder<F>
    where F: Invoke<ast::PolyTraitRef>,
{
    pub fn new_with_callback<P>(path: P, callback: F) -> Self
        where P: IntoPath,
    {
        let trait_ref = ast::TraitRef {
            path: path.into_path(),
            ref_id: ast::DUMMY_NODE_ID,
        };

        PolyTraitRefBuilder {
            callback: callback,
            span: DUMMY_SP,
            trait_ref: trait_ref,
            lifetimes: Vec::new(),
        }
    }

    pub fn span(mut self, span: Span) -> Self {
        self.span = span;
        self
    }

    pub fn with_lifetime<L>(mut self, lifetime: L) -> Self
        where L: IntoLifetimeDef,
    {
        self.lifetimes.push(lifetime.into_lifetime_def());
        self
    }

    pub fn lifetime<N>(self, name: N) -> LifetimeDefBuilder<Self>
        where N: ToName,
    {
        LifetimeDefBuilder::new_with_callback(name, self)
    }

    pub fn build(self) -> F::Result {
        self.callback.invoke(ast::PolyTraitRef {
            bound_lifetimes: self.lifetimes,
            trait_ref: self.trait_ref,
            span: self.span,
        })
    }
}

impl<F> Invoke<ast::LifetimeDef> for PolyTraitRefBuilder<F>
    where F: Invoke<ast::PolyTraitRef>,
{
    type Result = Self;

    fn invoke(self, lifetime: ast::LifetimeDef) -> Self {
        self.with_lifetime(lifetime)
    }
}