sval_derive

Automatically derive sval::Value.

lib.rs:

#![derive(Value)].

This library hosts a custom-derive to simplify implementing sval::Value.

Structs

Container attributes:

• #[sval(tag = "path::to::TAG")]: Set a tag on the struct. No tag is used by default.
• #[sval(label = "text")]: Set a label on the struct. The identifier of the struct is used by default.
• #[sval(index = 1)]: Set an index on the struct. No index is used by default.
• #[sval(unlabeled_fields)]: Specify that all fields should be unlabeled. This will stream the struct as a tuple. If #[sval(unindexed_fields)] is also specified then it will stream the struct as a sequence.
• #[sval(unindexed_fields]: Specify that all fields should be unindexed. This will stream the struct as a record. If #[sval(unlabeled_fields)] is also specified then it will stream the struct as a sequence.

Field attributes:

• #[sval(tag = "path::to::TAG")]: Set a tag on the struct field itself. No tag is used by default. If you want to use a tag to signal that the field's value has a particular property then use #[sval(data_tag)].
• #[sval(data_tag = "path::to::TAG")]: Set a tag on the struct field's value. No tag is used by default.
• #[sval(label = "text")]: Set a label on the struct field. The identifier of the field is used by default.
• #[sval(index = 1)]: Set an index on the struct field. The zero-based offset of the field is used by default.
• #[sval(skip)]: Skip a field.
• #[sval(flatten)]: Flatten the field onto the struct. This attribute requires the flatten Cargo feature.

Newtypes

Container attributes:

• #[sval(tag = "path::to::TAG")]: Set a tag on the newtype. No tag is used by default.
• #[sval(label = "text")]: Set a label on the newtype. The identifier of the newtype is used by default.
• #[sval(index = 1)]: Set an index on the newtype. No index is used by default.
• #[sval(transparent)]: Stream the newtype as its underlying field without wrapping it.

Enums

Container attributes:

• #[sval(tag = "path::to::TAG")]: Set a tag on the enum. No tag is used by default.
• #[sval(label = "text")]: Set a label on the enum. The identifier of the enum is used by default.
• #[sval(index = 1)]: Set an index on the enum. No index is used by default.
• #[sval(dynamic)]: Stream the variant without wrapping it in an enum.

Variant attributes:

• #[sval(tag = "path::to::TAG")]: Set a tag on the enum variant itself. No tag is used by default.
• #[sval(label = "text")]: Set a label on the enum variant. The identifier of the variant is used by default.
• #[sval(index = 1)]: Set an index on the enum variant. The zero-based offset of the variant is used by default.