Function synstructure::match_pattern

pub fn match_pattern<'a, N: ToTokens>(
    name: &N, 
    vd: &'a VariantData, 
    options: &BindOpts
) -> (Tokens, Vec<BindingInfo<'a>>)

Generate a match pattern for binding to the given VariantData This function returns a tuple of the tokens which make up that match pattern, and a BindingInfo object for each of the bindings which were made. The bind parameter controls the type of binding which is made.

Example

extern crate syn;
extern crate synstructure;
#[macro_use]
extern crate quote;
use synstructure::{match_pattern, BindStyle};

fn main() {
    let ast = syn::parse_macro_input("struct A { a: i32, b: i32 }").unwrap();
    let vd = if let syn::Body::Struct(ref vd) = ast.body {
        vd
    } else { unreachable!() };

    let (tokens, bindings) = match_pattern(&ast.ident, vd, &BindStyle::Ref.into());
    assert_eq!(tokens.to_string(), quote! {
         A{ a: ref __binding_0, b: ref __binding_1, }
    }.to_string());
    assert_eq!(bindings.len(), 2);
    assert_eq!(&bindings[0].ident.to_string(), "__binding_0");
    assert_eq!(&bindings[1].ident.to_string(), "__binding_1");
}