Trait evitable_syn_meta_ext::FromMeta

pub trait FromMeta: Sized {
    fn from_nested_meta(item: &NestedMeta) -> Result<Self> { ... }
    fn from_meta(item: &Meta) -> Result<Self> { ... }
    fn from_empty() -> Result<Self> { ... }
    fn from_list(items: &[&NestedMeta]) -> Result<Self> { ... }
    fn from_value(value: &MetaValue) -> Result<Self> { ... }
    fn from_lit(lit: &Lit) -> Result<Self> { ... }
    fn from_char<S: Spanned>(value: char, span: &S) -> Result<Self> { ... }
    fn from_int<S: Spanned>(value: u64, span: &S) -> Result<Self> { ... }
    fn from_path(value: &Path) -> Result<Self> { ... }
    fn from_string<S: Spanned>(value: &str, span: &S) -> Result<Self> { ... }
    fn from_bool<S: Spanned>(value: bool, span: &S) -> Result<Self> { ... }
    fn from_ident(value: &Ident) -> Result<Self> { ... }
}

Provided methods

fn from_nested_meta(item: &NestedMeta) -> Result<Self>

fn from_meta(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.

Error Spans

If this method is overridden and can introduce errors that weren't passed up from other from_meta calls, the override must call with_span on the error using the item to make sure that the emitted diagnostic points to the correct location in source code.

fn from_empty() -> 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: &MetaValue) -> 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.

Error Spans

If this method is overridden, the override must make sure to add value's span information to the returned error by calling with_span(value) on the Error instance.

fn from_lit(lit: &Lit) -> Result<Self>

fn from_char<S: Spanned>(value: char, span: &S) -> Result<Self>

Create an instance from a char literal in a value position.

fn from_int<S: Spanned>(value: u64, span: &S) -> Result<Self>

Create an instance from a int literal in a value position.

fn from_path(value: &Path) -> Result<Self>

Create an instance from a char literal in a value position.

fn from_string<S: Spanned>(value: &str, span: &S) -> Result<Self>

Create an instance from a string literal in a value position.

fn from_bool<S: Spanned>(value: bool, span: &S) -> Result<Self>

Create an instance from a bool literal in a value position.

fn from_ident(value: &Ident) -> Result<Self>

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Implementations on Foreign Types

impl FromMeta for ()

fn from_empty() -> Result<Self>

impl FromMeta for bool

fn from_empty() -> Result<Self>

fn from_bool<S: Spanned>(value: bool, _: &S) -> Result<Self>

fn from_string<S: Spanned>(value: &str, span: &S) -> Result<Self>

impl FromMeta for AtomicBool

fn from_meta(mi: &Meta) -> Result<Self>

impl FromMeta for String

fn from_string<S: Spanned>(s: &str, _span: &S) -> Result<Self>

fn from_path(p: &Path) -> Result<Self>

impl FromMeta for u8

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for u16

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for u32

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for u64

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for usize

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for i8

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for i16

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for i32

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for i64

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for isize

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for f32

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for f64

fn from_string<S: Spanned>(s: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for Ident

Parsing support for identifiers. This attempts to preserve span information when available, but also supports parsing strings with the call site as the emitted span.

fn from_ident(value: &Ident) -> Result<Self>

fn from_string<S: Spanned>(value: &str, span: &S) -> Result<Self>

impl FromMeta for Path

Parsing support for paths. This attempts to preserve span information when available, but also supports parsing strings with the call site as the emitted span.

fn from_path(path: &Path) -> Result<Self>

fn from_string<S: Spanned>(value: &str, span: &S) -> Result<Self>

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for Lit

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for LitInt

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for LitFloat

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for LitStr

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for LitByte

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for LitByteStr

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for LitChar

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for LitBool

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for Literal

fn from_lit(value: &Lit) -> Result<Self>

impl FromMeta for RenameRule

fn from_string<S: Spanned>(value: &str, span: &S) -> Result<Self>

impl<T: FromMeta> FromMeta for Option<T>

fn from_meta(item: &Meta) -> Result<Self>

impl<T: FromMeta> FromMeta for Box<T>

fn from_meta(item: &Meta) -> Result<Self>

impl<T: FromMeta> FromMeta for Result<T, Meta>

Parses the meta-item, and in case of error preserves a copy of the input for later analysis.

fn from_meta(item: &Meta) -> Result<Self>

impl<T: FromMeta> FromMeta for Rc<T>

fn from_meta(item: &Meta) -> Result<Self>

impl<T: FromMeta> FromMeta for Arc<T>

fn from_meta(item: &Meta) -> Result<Self>

impl<T: FromMeta> FromMeta for Vec<T>

fn from_empty() -> Result<Self>

fn from_list(items: &[&NestedMeta]) -> Result<Self>

fn from_value(val: &MetaValue) -> Result<Self>

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Implementors

impl FromMeta for Meta

fn from_meta(value: &Meta) -> Result<Self>

impl<T: FromMeta> FromMeta for evitable_syn_meta_ext::error::Result<T>

fn from_meta(item: &Meta) -> Result<Self>

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