33 lines
1.1 KiB
Rust
33 lines
1.1 KiB
Rust
use crate::buffer::Cursor;
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use crate::ext::TokenStreamExt as _;
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use core::cmp::Ordering;
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use proc_macro2::{Delimiter, TokenStream};
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pub(crate) fn between(begin: Cursor, end: Cursor) -> TokenStream {
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let mut cursor = begin;
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assert!(crate::buffer::same_buffer(end, cursor));
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let mut tokens = TokenStream::new();
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while cursor != end {
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let (tt, next) = cursor.token_tree().unwrap();
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if crate::buffer::cmp_assuming_same_buffer(end, next) == Ordering::Less {
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// A syntax node can cross the boundary of a None-delimited group
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// due to such groups being transparent to the parser in most cases.
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// Any time this occurs the group is known to be semantically
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// irrelevant. https://github.com/dtolnay/syn/issues/1235
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if let Some((inside, _span, after)) = cursor.group(Delimiter::None) {
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assert!(next == after);
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cursor = inside;
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continue;
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} else {
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panic!("verbatim end must not be inside a delimited group");
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}
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}
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tokens.append(tt);
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cursor = next;
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}
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tokens
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}
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