From d82f5da5aef06a0989430c5ea9cc60a483f1fbff Mon Sep 17 00:00:00 2001 From: HampusM Date: Sat, 12 Nov 2022 15:01:19 +0100 Subject: feat: add project & repeat_char macro --- .gitignore | 2 + Cargo.toml | 12 ++++ LICENSE-APACHE | 202 +++++++++++++++++++++++++++++++++++++++++++++++++++++ LICENSE-MIT | 22 ++++++ examples/simple.rs | 8 +++ rustfmt.toml | 11 +++ src/lib.rs | 62 ++++++++++++++++ 7 files changed, 319 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.toml create mode 100644 LICENSE-APACHE create mode 100644 LICENSE-MIT create mode 100644 examples/simple.rs create mode 100644 rustfmt.toml create mode 100644 src/lib.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..4fffb2f --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/target +/Cargo.lock diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..1ca2db0 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,12 @@ +[package] +name = "utility-macros" +version = "0.1.0" +description = "Utility macros that should be in std but is not" +edition = "2021" + +[lib] +proc_macro = true + +[dependencies] +syn = { version = "1.0.96", features = ["full"] } +quote = "1.0.18" diff --git a/LICENSE-APACHE b/LICENSE-APACHE new file mode 100644 index 0000000..ef26755 --- /dev/null +++ b/LICENSE-APACHE @@ -0,0 +1,202 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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Utility macros that should be in std but is not. + +use std::iter::repeat; + +use proc_macro::TokenStream; +use quote::quote; +use syn::parse::Parse; +use syn::{parse_macro_input, LitChar, LitInt, Token}; + +/// Repeats a character N number of times resulting in a string literal. +/// +/// # Arguments +/// Seperated by commas. +/// +/// - The character to repeat +/// - Number of times to repeat it. +/// +/// # Examples +/// ``` +/// # use utility_macros::repeat_char; +/// +/// let eight_o = repeat_char!('o', 8); +/// +/// assert_eq!(eight_o, "oooooooo"); +/// ``` +#[proc_macro] +pub fn repeat_char(input: TokenStream) -> TokenStream +{ + let RepeatCharMacroArgs { character, count } = + parse_macro_input!(input as RepeatCharMacroArgs); + + let repeated = repeat(character.value()).take(count).collect::(); + + quote! { + #repeated + } + .into() +} + +struct RepeatCharMacroArgs +{ + character: LitChar, + count: usize, +} + +impl Parse for RepeatCharMacroArgs +{ + fn parse(input: syn::parse::ParseStream) -> syn::Result + { + let character = input.parse::()?; + + input.parse::()?; + + let count = input.parse::()?.base10_parse::()?; + + Ok(Self { character, count }) + } +} -- cgit v1.2.3-18-g5258