Add macro examples
This commit is contained in:
Timothy Warren
parent
59bc706d0a
commit
12b2de3d68
2
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2
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@ -41,6 +41,8 @@
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<caret line="9" lean-forward="true" selection-start-line="9" selection-end-line="9" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/hello_macro/hello_macro_derive/Cargo.toml">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="192">
|
||||
<caret line="12" lean-forward="true" selection-start-line="12" selection-end-line="12" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/pancakes/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="144">
|
||||
<caret line="9" lean-forward="true" selection-start-line="9" selection-end-line="9" />
|
||||
<folding>
|
||||
<element signature="e#116#117#0" expanded="true" />
|
||||
<element signature="e#147#148#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/hello_macro/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="288">
|
||||
<caret line="18" column="5" selection-start-line="18" selection-start-column="5" selection-end-line="18" selection-end-column="5" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/hello_macro/hello_macro_derive/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="336">
|
||||
<caret line="21" column="24" selection-start-line="21" selection-start-column="24" selection-end-line="21" selection-end-column="24" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</component>
|
||||
</project>
|
||||
7
hello_macro/Cargo.toml
Normal file
7
hello_macro/Cargo.toml
Normal file
@ -0,0 +1,7 @@
|
||||
[package]
|
||||
name = "hello_macro"
|
||||
version = "0.1.0"
|
||||
authors = ["Timothy Warren <twarren@nabancard.com>"]
|
||||
edition = "2018"
|
||||
|
||||
[dependencies]
|
||||
12
hello_macro/hello_macro_derive/Cargo.toml
Normal file
12
hello_macro/hello_macro_derive/Cargo.toml
Normal file
@ -0,0 +1,12 @@
|
||||
[package]
|
||||
name = "hello_macro_derive"
|
||||
version = "0.1.0"
|
||||
authors = ["Timothy Warren <twarren@nabancard.com>"]
|
||||
edition = "2018"
|
||||
|
||||
[lib]
|
||||
proc-macro = true
|
||||
|
||||
[dependencies]
|
||||
syn = "0.14.4"
|
||||
quote = "0.6.3"
|
||||
27
hello_macro/hello_macro_derive/src/lib.rs
Normal file
27
hello_macro/hello_macro_derive/src/lib.rs
Normal file
@ -0,0 +1,27 @@
|
||||
extern crate proc_macro;
|
||||
|
||||
use crate::proc_macro::TokenStream;
|
||||
use quote::quote;
|
||||
use syn;
|
||||
|
||||
#[proc_macro_derive(HelloMacro)]
|
||||
pub fn hello_macro_derive(input: TokenStream) -> TokenStream {
|
||||
// Construct a representation of Rust code as a syntax tree
|
||||
// that we can manipulate
|
||||
let ast = syn::parse(input).unwrap();
|
||||
|
||||
// Build the trait implementation
|
||||
impl_hello_macro(&ast)
|
||||
}
|
||||
|
||||
fn impl_hello_macro(ast: &syn::DeriveInput) -> TokenStream {
|
||||
let name = &ast.ident;
|
||||
let gen = quote! (
|
||||
impl HelloMacro for #name {
|
||||
fn hello_macro() {
|
||||
println!("Hello, Macro! My name is {}", stringify!(#name));
|
||||
}
|
||||
}
|
||||
);
|
||||
gen.into()
|
||||
}
|
||||
20
hello_macro/src/lib.rs
Normal file
20
hello_macro/src/lib.rs
Normal file
@ -0,0 +1,20 @@
|
||||
|
||||
|
||||
pub trait HelloMacro {
|
||||
fn hello_macro();
|
||||
}
|
||||
|
||||
/// Simplified version of the vec! macro
|
||||
/// This is an example of a declarative macro
|
||||
#[macro_export] // This makes the macro usable
|
||||
macro_rules! vec {
|
||||
( $( $x:expr ),* ) => { // This matches the argument list
|
||||
{
|
||||
let mut temp_vec = Vec::new();
|
||||
$(
|
||||
temp_vec.push($x);
|
||||
)*
|
||||
temp_vec
|
||||
}
|
||||
};
|
||||
}
|
||||
9
pancakes/Cargo.toml
Normal file
9
pancakes/Cargo.toml
Normal file
@ -0,0 +1,9 @@
|
||||
[package]
|
||||
name = "pancakes"
|
||||
version = "0.1.0"
|
||||
authors = ["Timothy Warren <twarren@nabancard.com>"]
|
||||
edition = "2018"
|
||||
|
||||
[dependencies]
|
||||
hello_macro = { path = "../hello_macro" }
|
||||
hello_macro_derive = { path = "../hello_macro/hello_macro_derive" }
|
||||
9
pancakes/src/main.rs
Normal file
9
pancakes/src/main.rs
Normal file
@ -0,0 +1,9 @@
|
||||
use hello_macro::HelloMacro;
|
||||
use hello_macro_derive::HelloMacro;
|
||||
|
||||
#[derive(HelloMacro)]
|
||||
struct Pancakes;
|
||||
|
||||
fn main() {
|
||||
Pancakes::hello_macro();
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user