cxx_gen/syntax/
instantiate.rs

1use crate::syntax::{NamedType, Ty1, Type};
2use proc_macro2::{Ident, Span};
3use std::hash::{Hash, Hasher};
4use syn::Token;
5
6#[derive(Copy, Clone, PartialEq, Eq, Hash)]
7pub(crate) enum ImplKey<'a> {
8    RustBox(NamedImplKey<'a>),
9    RustVec(NamedImplKey<'a>),
10    UniquePtr(NamedImplKey<'a>),
11    SharedPtr(NamedImplKey<'a>),
12    WeakPtr(NamedImplKey<'a>),
13    CxxVector(NamedImplKey<'a>),
14}
15
16#[derive(Copy, Clone)]
17pub(crate) struct NamedImplKey<'a> {
18    #[allow(dead_code)] // only used by cxxbridge-macro, not cxx-build
19    pub begin_span: Span,
20    pub rust: &'a Ident,
21    #[allow(dead_code)] // only used by cxxbridge-macro, not cxx-build
22    pub lt_token: Option<Token![<]>,
23    #[allow(dead_code)] // only used by cxxbridge-macro, not cxx-build
24    pub gt_token: Option<Token![>]>,
25    #[allow(dead_code)] // only used by cxxbridge-macro, not cxx-build
26    pub end_span: Span,
27}
28
29impl Type {
30    pub(crate) fn impl_key(&self) -> Option<ImplKey> {
31        if let Type::RustBox(ty) = self {
32            if let Type::Ident(ident) = &ty.inner {
33                return Some(ImplKey::RustBox(NamedImplKey::new(ty, ident)));
34            }
35        } else if let Type::RustVec(ty) = self {
36            if let Type::Ident(ident) = &ty.inner {
37                return Some(ImplKey::RustVec(NamedImplKey::new(ty, ident)));
38            }
39        } else if let Type::UniquePtr(ty) = self {
40            if let Type::Ident(ident) = &ty.inner {
41                return Some(ImplKey::UniquePtr(NamedImplKey::new(ty, ident)));
42            }
43        } else if let Type::SharedPtr(ty) = self {
44            if let Type::Ident(ident) = &ty.inner {
45                return Some(ImplKey::SharedPtr(NamedImplKey::new(ty, ident)));
46            }
47        } else if let Type::WeakPtr(ty) = self {
48            if let Type::Ident(ident) = &ty.inner {
49                return Some(ImplKey::WeakPtr(NamedImplKey::new(ty, ident)));
50            }
51        } else if let Type::CxxVector(ty) = self {
52            if let Type::Ident(ident) = &ty.inner {
53                return Some(ImplKey::CxxVector(NamedImplKey::new(ty, ident)));
54            }
55        }
56        None
57    }
58}
59
60impl<'a> PartialEq for NamedImplKey<'a> {
61    fn eq(&self, other: &Self) -> bool {
62        PartialEq::eq(self.rust, other.rust)
63    }
64}
65
66impl<'a> Eq for NamedImplKey<'a> {}
67
68impl<'a> Hash for NamedImplKey<'a> {
69    fn hash<H: Hasher>(&self, hasher: &mut H) {
70        self.rust.hash(hasher);
71    }
72}
73
74impl<'a> NamedImplKey<'a> {
75    fn new(outer: &Ty1, inner: &'a NamedType) -> Self {
76        NamedImplKey {
77            begin_span: outer.name.span(),
78            rust: &inner.rust,
79            lt_token: inner.generics.lt_token,
80            gt_token: inner.generics.gt_token,
81            end_span: outer.rangle.span,
82        }
83    }
84}
cxx_gen/syntax/instantiate.rs

cxx_gen/syntax/
instantiate.rs
