Parses a set pattern: #(pattern, pattern, ..) # Example Input ```text #(1, 2, 3) #(> 0, < 10, ..) #(_ { kind: "click", .. }, ..) ```
(input: syn::parse::ParseStream)
| 29 | /// #(_ { kind: "click", .. }, ..) |
| 30 | /// ``` |
| 31 | fn parse(input: syn::parse::ParseStream) -> syn::Result<Self> { |
| 32 | // Capture the span of the `#` token before consuming anything |
| 33 | let hash_span = input.span(); |
| 34 | |
| 35 | // Consume the # token |
| 36 | let _: Token![#] = input.parse()?; |
| 37 | |
| 38 | let content; |
| 39 | let paren = syn::parenthesized!(content in input); |
| 40 | |
| 41 | // Full span from `#` to closing `)` |
| 42 | let span = hash_span.join(paren.span.close()).unwrap_or(hash_span); |
| 43 | |
| 44 | let mut elements = Vec::new(); |
| 45 | let mut rest = false; |
| 46 | |
| 47 | while !content.is_empty() { |
| 48 | // Check for rest pattern (..) |
| 49 | if content.peek(Token![..]) { |
| 50 | let _: Token![..] = content.parse()?; |
| 51 | rest = true; |
| 52 | // Optional trailing comma |
| 53 | if content.peek(Token![,]) { |
| 54 | let _: Token![,] = content.parse()?; |
| 55 | } |
| 56 | break; |
| 57 | } |
| 58 | |
| 59 | elements.push(content.parse()?); |
| 60 | |
| 61 | if content.is_empty() { |
| 62 | break; |
| 63 | } |
| 64 | |
| 65 | let _: Token![,] = content.parse()?; |
| 66 | |
| 67 | // Rest pattern can appear after a comma |
| 68 | if content.peek(Token![..]) { |
| 69 | let _: Token![..] = content.parse()?; |
| 70 | rest = true; |
| 71 | break; |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | Ok(PatternSet { |
| 76 | node_id: next_node_id(), |
| 77 | span, |
| 78 | elements, |
| 79 | rest, |
| 80 | }) |
| 81 | } |
| 82 | } |
nothing calls this directly
no test coverage detected