diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/attr.rs | 2 | ||||
| -rw-r--r-- | src/lib.rs | 38 |
2 files changed, 29 insertions, 11 deletions
diff --git a/src/attr.rs b/src/attr.rs index be64a79..8626d11 100644 --- a/src/attr.rs +++ b/src/attr.rs @@ -63,7 +63,7 @@ pub fn expand_attr( let mut group_contains_paste = false; let mut expanded = TokenStream::new(); let mut nested_attr = TokenStream::new(); - for tt in group.stream().into_iter() { + for tt in group.stream() { match &tt { TokenTree::Punct(punct) if punct.as_char() == ',' => { expanded.extend(expand_attr( @@ -132,11 +132,17 @@ //! }; //! } //! -//! # struct Paste; +//! pub struct Paste {} +//! //! method_new!(Paste); // expands to #[doc = "Create a new `Paste` object"] //! ``` -#![allow(clippy::needless_doctest_main)] +#![allow( + clippy::doc_markdown, + clippy::module_name_repetitions, + clippy::needless_doctest_main, + clippy::too_many_lines +)] extern crate proc_macro; @@ -154,7 +160,8 @@ use std::panic; #[proc_macro] pub fn paste(input: TokenStream) -> TokenStream { let mut contains_paste = false; - match expand(input, &mut contains_paste) { + let flatten_single_interpolation = true; + match expand(input, &mut contains_paste, flatten_single_interpolation) { Ok(expanded) => expanded, Err(err) => err.to_compile_error(), } @@ -172,7 +179,11 @@ pub fn expr(input: TokenStream) -> TokenStream { paste(input) } -fn expand(input: TokenStream, contains_paste: &mut bool) -> Result<TokenStream> { +fn expand( + input: TokenStream, + contains_paste: &mut bool, + flatten_single_interpolation: bool, +) -> Result<TokenStream> { let mut expanded = TokenStream::new(); let mut lookbehind = Lookbehind::Other; let mut prev_none_group = None::<Group>; @@ -203,15 +214,22 @@ fn expand(input: TokenStream, contains_paste: &mut bool) -> Result<TokenStream> let tokens = pasted_to_tokens(pasted, span)?; expanded.extend(tokens); *contains_paste = true; - } else if delimiter == Delimiter::None && is_flat_group(&content) { + } else if flatten_single_interpolation + && delimiter == Delimiter::None + && is_single_interpolation_group(&content) + { expanded.extend(content); *contains_paste = true; } else { let mut group_contains_paste = false; - let mut nested = expand(content, &mut group_contains_paste)?; - if delimiter == Delimiter::Bracket - && (lookbehind == Lookbehind::Pound || lookbehind == Lookbehind::PoundBang) - { + let is_attribute = delimiter == Delimiter::Bracket + && (lookbehind == Lookbehind::Pound || lookbehind == Lookbehind::PoundBang); + let mut nested = expand( + content, + &mut group_contains_paste, + flatten_single_interpolation && !is_attribute, + )?; + if is_attribute { nested = expand_attr(nested, span, &mut group_contains_paste)? } let group = if group_contains_paste { @@ -262,7 +280,7 @@ enum Lookbehind { } // https://github.com/dtolnay/paste/issues/26 -fn is_flat_group(input: &TokenStream) -> bool { +fn is_single_interpolation_group(input: &TokenStream) -> bool { #[derive(PartialEq)] enum State { Init, |