diff options
Diffstat (limited to 'gcc/rust/expand/rust-macro-expand.h')
| -rw-r--r-- | gcc/rust/expand/rust-macro-expand.h | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/rust/expand/rust-macro-expand.h b/gcc/rust/expand/rust-macro-expand.h index 51e5ad1..f3cb36d 100644 --- a/gcc/rust/expand/rust-macro-expand.h +++ b/gcc/rust/expand/rust-macro-expand.h @@ -57,11 +57,21 @@ struct MatchedFragment size_t match_amount; MatchedFragment (std::string identifier, size_t token_offset_begin, - size_t token_offset_end, size_t match_amount = 0) + size_t token_offset_end, size_t match_amount = 1) : fragment_ident (identifier), token_offset_begin (token_offset_begin), token_offset_end (token_offset_end), match_amount (match_amount) {} + /** + * Create a valid fragment matched zero times. This is useful for repetitions + * which allow the absence of a fragment, such as * and ? + */ + static MatchedFragment zero (std::string identifier) + { + // We don't need offsets since there is "no match" + return MatchedFragment (identifier, 0, 0, 0); + } + std::string as_string () const { return fragment_ident + "=" + std::to_string (token_offset_begin) + ":" |