Struct ChainCall

Source

pub struct ChainCall { /* private fields */ }

Expand description

One dot-call in an AttributeChain.

Implementations§

Source §

impl ChainCall

Source

pub fn method(&self) -> &Ident

Examples found in repository ?

examples/derive_field_attrs.rs (line 71)

55fn expand_field_attrs(field: &Field) -> syn::Result<Vec<TokenStream>> {
56    let field_ident = field
57        .ident
58        .as_ref()
59        .expect("named_fields only returns named struct fields");
60    let mut expansions = Vec::new();
61
62    for attr in &field.attrs {
63        if !attr.path().is_ident("attribute_dsl") {
64            continue;
65        }
66
67        let chain = attr.parse_args::<AttributeChain>()?;
68        let root = substitute_infer_in_path(chain.root_path(), &field.ty);
69
70        let calls = chain.calls().iter().map(|call| {
71            let method = call.method();
72            let turbofish = call.turbofish();
73            let args = call.args();
74            quote! { .#method #turbofish (#(#args),*) }
75        });
76
77        let completion = chain
78            .completion_marker()
79            .map(|marker| quote! { .#marker })
80            .unwrap_or_default();
81
82        expansions.push(quote! {
83            let _ = #root::builder_for(stringify!(#field_ident)) #(#calls)* #completion;
84        });
85    }
86
87    Ok(expansions)
88}

Source

pub fn turbofish(&self) -> Option<&AngleBracketedGenericArguments>

Examples found in repository ?

examples/derive_field_attrs.rs (line 72)

55fn expand_field_attrs(field: &Field) -> syn::Result<Vec<TokenStream>> {
56    let field_ident = field
57        .ident
58        .as_ref()
59        .expect("named_fields only returns named struct fields");
60    let mut expansions = Vec::new();
61
62    for attr in &field.attrs {
63        if !attr.path().is_ident("attribute_dsl") {
64            continue;
65        }
66
67        let chain = attr.parse_args::<AttributeChain>()?;
68        let root = substitute_infer_in_path(chain.root_path(), &field.ty);
69
70        let calls = chain.calls().iter().map(|call| {
71            let method = call.method();
72            let turbofish = call.turbofish();
73            let args = call.args();
74            quote! { .#method #turbofish (#(#args),*) }
75        });
76
77        let completion = chain
78            .completion_marker()
79            .map(|marker| quote! { .#marker })
80            .unwrap_or_default();
81
82        expansions.push(quote! {
83            let _ = #root::builder_for(stringify!(#field_ident)) #(#calls)* #completion;
84        });
85    }
86
87    Ok(expansions)
88}

Source

pub fn args(&self) -> &[Expr]

Examples found in repository ?

examples/derive_field_attrs.rs (line 73)

55fn expand_field_attrs(field: &Field) -> syn::Result<Vec<TokenStream>> {
56    let field_ident = field
57        .ident
58        .as_ref()
59        .expect("named_fields only returns named struct fields");
60    let mut expansions = Vec::new();
61
62    for attr in &field.attrs {
63        if !attr.path().is_ident("attribute_dsl") {
64            continue;
65        }
66
67        let chain = attr.parse_args::<AttributeChain>()?;
68        let root = substitute_infer_in_path(chain.root_path(), &field.ty);
69
70        let calls = chain.calls().iter().map(|call| {
71            let method = call.method();
72            let turbofish = call.turbofish();
73            let args = call.args();
74            quote! { .#method #turbofish (#(#args),*) }
75        });
76
77        let completion = chain
78            .completion_marker()
79            .map(|marker| quote! { .#marker })
80            .unwrap_or_default();
81
82        expansions.push(quote! {
83            let _ = #root::builder_for(stringify!(#field_ident)) #(#calls)* #completion;
84        });
85    }
86
87    Ok(expansions)
88}