| 77 | } |
| 78 | |
| 79 | fn parse_argument(&mut self, meta: ParseNestedMeta<'_>) -> Result<()> { |
| 80 | if let ParameterKind::Flatten = self.kind { |
| 81 | return Err(meta.error("can't put additional arguments on a flatten arg")); |
| 82 | } |
| 83 | if meta.path.is_ident("default") && meta.input.peek(Token![=]) { |
| 84 | if matches!(self.default, Some(Some(_))) { |
| 85 | return Err(meta.error("Default already set")); |
| 86 | } |
| 87 | let val = meta.value()?; |
| 88 | self.default = Some(Some(val.parse()?)) |
| 89 | } else if meta.path.is_ident("default") || meta.path.is_ident("optional") { |
| 90 | if self.default.is_none() { |
| 91 | self.default = Some(None); |
| 92 | } |
| 93 | } else if meta.path.is_ident("name") { |
| 94 | if self.name.is_some() { |
| 95 | return Err(meta.error("already have a name")); |
| 96 | } |
| 97 | let val = meta.value()?.parse::<syn::LitStr>()?; |
| 98 | self.name = Some(val.value()) |
| 99 | } else if meta.path.is_ident("error_msg") { |
| 100 | if self.error_msg.is_some() { |
| 101 | return Err(meta.error("already have an error_msg")); |
| 102 | } |
| 103 | let val = meta.value()?.parse::<syn::LitStr>()?; |
| 104 | self.error_msg = Some(val.value()) |
| 105 | } else { |
| 106 | return Err(meta.error("Unrecognized pyarg attribute")); |
| 107 | } |
| 108 | |
| 109 | Ok(()) |
| 110 | } |
| 111 | } |
| 112 | |
| 113 | impl TryFrom<&Field> for ArgAttribute { |