41 lines
1.2 KiB
Rust
41 lines
1.2 KiB
Rust
extern crate proc_macro;
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use proc_macro::TokenStream;
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use proc_macro::TokenTree;
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use proc_macro::Ident;
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use proc_macro::Span;
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use std::iter::FromIterator;
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static mut TEMP_COUNTER: i64 = 0;
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#[proc_macro]
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pub fn temp(item: TokenStream) -> TokenStream {
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let mut iterator = item.clone().into_iter().peekable();
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if item.is_empty() {
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unsafe { TEMP_COUNTER += 1; }
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} else if let Some(TokenTree::Literal(_)) = iterator.peek() {
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if let Ok(number) = item.to_string().parse::<i64>() {
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unsafe { TEMP_COUNTER = number; }
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}
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} else if let Some(TokenTree::Punct(i)) = iterator.next() {
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if i.as_char() == '+' {
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if let Some(TokenTree::Literal(i)) = iterator.next() {
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if let Ok(number) = i.to_string().parse::<i64>() {
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unsafe { TEMP_COUNTER += number; }
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}
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}
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} else if i.as_char() == '-' {
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if let Some(TokenTree::Literal(i)) = iterator.next() {
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if let Ok(number) = i.to_string().parse::<i64>() {
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unsafe { TEMP_COUNTER -= number; }
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}
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} else if let None = iterator.next() {
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}
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}
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} else {
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panic!("Invalid input to temporary variable generator.");
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}
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TokenStream::from_iter([
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TokenTree::Ident(Ident::new(format!("temp{}", unsafe { TEMP_COUNTER }).as_str(), Span::call_site()))
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])
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}
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