Trait darling_core::FromMetaItem
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pub trait FromMetaItem: Sized { fn from_nested_meta_item(item: &NestedMeta) -> Result<Self> { ... } fn from_meta_item(item: &Meta) -> Result<Self> { ... } fn from_word() -> Result<Self> { ... } fn from_list(items: &[NestedMeta]) -> Result<Self> { ... } fn from_value(value: &Lit) -> Result<Self> { ... } fn from_char(value: char) -> Result<Self> { ... } fn from_string(value: &str) -> Result<Self> { ... } fn from_bool(value: bool) -> Result<Self> { ... } }
Create an instance from an item in an attribute declaration.
Implementing FromMetaItem
- Do not take a dependency on the
ident
of the passed-in meta item. The ident will be set by the field name of the containing struct. - Implement only the
from_*
methods that you intend to support. The default implementations will return useful errors.
Provided Implementations
bool
- Word with no value specified - becomes
true
. - As a boolean literal, e.g.
foo = true
. - As a string literal, e.g.
foo = "true"
.
String
- As a string literal, e.g.
foo = "hello"
. - As a raw string literal, e.g.
foo = r#"hello "world""#
.
()
- Word with no value specified, e.g.
foo
. This is best used withOption
. Seedarling::util::Flag
for a more strongly-typed alternative.
Option
- Any format produces
Some
.
Result<T, darling::Error>
- Allows for fallible parsing; will populate the target field with the result of the parse attempt.
Provided Methods
fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
fn from_meta_item(item: &Meta) -> Result<Self>
Create an instance from a syn::Meta
by dispatching to the format-appropriate
trait function. This generally should not be overridden by implementers.
fn from_word() -> Result<Self>
Create an instance from the presence of the word in the attribute with no additional options specified.
fn from_list(items: &[NestedMeta]) -> Result<Self>
Create an instance from a list of nested meta items.
fn from_value(value: &Lit) -> Result<Self>
Create an instance from a literal value of either foo = "bar"
or foo("bar")
.
This dispatches to the appropriate method based on the type of literal encountered,
and generally should not be overridden by implementers.
fn from_char(value: char) -> Result<Self>
Create an instance from a char literal in a value position.
fn from_string(value: &str) -> Result<Self>
Create an instance from a string literal in a value position.
fn from_bool(value: bool) -> Result<Self>
Create an instance from a bool literal in a value position.
Implementations on Foreign Types
impl FromMetaItem for ()
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fn from_word() -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for bool
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fn from_word() -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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impl FromMetaItem for AtomicBool
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fn from_meta_item(mi: &Meta) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for String
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for u8
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for u16
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for u32
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for u64
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for usize
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for i8
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for i16
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for i32
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for i64
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for isize
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fn from_string(s: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for Ident
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fn from_string(value: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for Path
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fn from_string(value: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for Meta
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fn from_meta_item(value: &Meta) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for WhereClause
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fn from_string(value: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for Vec<WherePredicate>
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fn from_string(value: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl FromMetaItem for RenameRule
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fn from_string(value: &str) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl<T: FromMetaItem> FromMetaItem for Option<T>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl<T: FromMetaItem> FromMetaItem for Box<T>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl<T: FromMetaItem> FromMetaItem for Result<T, Meta>
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Parses the meta-item, and in case of error preserves a copy of the input for later analysis.
fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl<T: FromMetaItem> FromMetaItem for Rc<T>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl<T: FromMetaItem> FromMetaItem for Arc<T>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl<T: FromMetaItem> FromMetaItem for RefCell<T>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_list(items: &[NestedMeta]) -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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impl<V: FromMetaItem> FromMetaItem for HashMap<String, V>
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fn from_list(nested: &[NestedMeta]) -> Result<Self>
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fn from_nested_meta_item(item: &NestedMeta) -> Result<Self>
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fn from_meta_item(item: &Meta) -> Result<Self>
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fn from_word() -> Result<Self>
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fn from_value(value: &Lit) -> Result<Self>
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fn from_char(value: char) -> Result<Self>
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fn from_string(value: &str) -> Result<Self>
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fn from_bool(value: bool) -> Result<Self>
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Implementors
impl<T: FromMetaItem> FromMetaItem for darling_core::error::Result<T>
impl FromMetaItem for ForwardAttrs
impl FromMetaItem for Shape
impl FromMetaItem for DataShape
impl FromMetaItem for IdentList
impl FromMetaItem for Ignored
impl<T: FromMetaItem> FromMetaItem for Override<T>
impl FromMetaItem for Flag