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--- /dev/null
+#[allow(unused_extern_crates)]
+extern crate proc_macro;
+
+use proc_macro::*;
+use proc_macro_hack::proc_macro_hack;
+use std::iter::once;
+mod span;
+use crate::span::{gen_random_bytes, gen_random};
+
+
+/// Create a TokenStream of an identifier out of a string
+fn ident(ident: &str) -> TokenStream {
+ TokenTree::from(Ident::new(ident, Span::call_site())).into()
+}
+
+#[proc_macro_hack]
+pub fn const_random(input: TokenStream) -> TokenStream {
+ match &input.to_string()[..] {
+ "u8" => TokenTree::from(Literal::u8_suffixed(gen_random())).into(),
+ "u16" => TokenTree::from(Literal::u16_suffixed(gen_random())).into(),
+ "u32" => TokenTree::from(Literal::u32_suffixed(gen_random())).into(),
+ "u64" => TokenTree::from(Literal::u64_suffixed(gen_random())).into(),
+ "u128" => TokenTree::from(Literal::u128_suffixed(gen_random())).into(),
+ "i8" => TokenTree::from(Literal::i8_suffixed(gen_random())).into(),
+ "i16" => TokenTree::from(Literal::i16_suffixed(gen_random())).into(),
+ "i32" => TokenTree::from(Literal::i32_suffixed(gen_random())).into(),
+ "i64" => TokenTree::from(Literal::i64_suffixed(gen_random())).into(),
+ "i128" => TokenTree::from(Literal::i128_suffixed(gen_random())).into(),
+ "usize" => {
+ let value: TokenStream = TokenTree::from(Literal::u128_suffixed(gen_random())).into();
+ let type_cast: TokenStream = [value, ident("as"), ident("usize")]
+ .iter()
+ .cloned()
+ .collect();
+ TokenTree::from(Group::new(Delimiter::Parenthesis, type_cast)).into()
+ }
+ "isize" => {
+ let value: TokenStream = TokenTree::from(Literal::i128_suffixed(gen_random())).into();
+ let type_cast: TokenStream = [value, ident("as"), ident("isize")]
+ .iter()
+ .cloned()
+ .collect();
+ TokenTree::from(Group::new(Delimiter::Parenthesis, type_cast)).into()
+ }
+ byte_array if byte_array.starts_with("[u8 ; ") && byte_array.ends_with(']')=> {
+ let len = byte_array[6..byte_array.len()-1].parse().unwrap();
+ let mut random_bytes = vec![0; len];
+ gen_random_bytes(&mut random_bytes);
+ let array_parts: TokenStream = random_bytes.into_iter().flat_map(|byte| {
+ let val = TokenTree::from(Literal::u8_suffixed(byte));
+ let comma = TokenTree::from(Punct::new(',', Spacing::Alone));
+ once(val).chain(once(comma))
+ }).collect();
+ TokenTree::from(Group::new(Delimiter::Bracket, array_parts)).into()
+ }
+ _ => panic!("Invalid type"),
+ }
+}
projects / platform / upstream / rust-const-random-macro.git / commitdiff