Struct syn::Path

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pub struct Path {
    pub leading_colon: Option<PathSep>,
    pub segments: Punctuated<PathSegment, PathSep>,
}
Expand description

A path at which a named item is exported (e.g. std::collections::HashMap).

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§leading_colon: Option<PathSep>§segments: Punctuated<PathSegment, PathSep>

Implementations§

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impl Path

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pub fn parse_mod_style(input: ParseStream<'_>) -> Result<Self>

Parse a Path containing no path arguments on any of its segments.

§Example
use syn::{Path, Result, Token};
use syn::parse::{Parse, ParseStream};

// A simplified single `use` statement like:
//
//     use std::collections::HashMap;
//
// Note that generic parameters are not allowed in a `use` statement
// so the following must not be accepted.
//
//     use a::<b>::c;
struct SingleUse {
    use_token: Token![use],
    path: Path,
}

impl Parse for SingleUse {
    fn parse(input: ParseStream) -> Result<Self> {
        Ok(SingleUse {
            use_token: input.parse()?,
            path: input.call(Path::parse_mod_style)?,
        })
    }
}
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impl Path

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pub fn is_ident<I>(&self, ident: &I) -> bool
where I: ?Sized, Ident: PartialEq<I>,

Determines whether this is a path of length 1 equal to the given ident.

For them to compare equal, it must be the case that:

  • the path has no leading colon,
  • the number of path segments is 1,
  • the first path segment has no angle bracketed or parenthesized path arguments, and
  • the ident of the first path segment is equal to the given one.
§Example
use proc_macro2::TokenStream;
use syn::{Attribute, Error, Meta, Result};

fn get_serde_meta_item(attr: &Attribute) -> Result<Option<&TokenStream>> {
    if attr.path().is_ident("serde") {
        match &attr.meta {
            Meta::List(meta) => Ok(Some(&meta.tokens)),
            bad => Err(Error::new_spanned(bad, "unrecognized attribute")),
        }
    } else {
        Ok(None)
    }
}
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pub fn get_ident(&self) -> Option<&Ident>

If this path consists of a single ident, returns the ident.

A path is considered an ident if:

  • the path has no leading colon,
  • the number of path segments is 1, and
  • the first path segment has no angle bracketed or parenthesized path arguments.
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pub fn require_ident(&self) -> Result<&Ident>

An error if this path is not a single ident, as defined in get_ident.

Trait Implementations§

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impl Clone for Path

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fn clone(&self) -> Self

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Path

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fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl From<Path> for Meta

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fn from(e: Path) -> Meta

Converts to this type from the input type.
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impl<T> From<T> for Path
where T: Into<PathSegment>,

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fn from(segment: T) -> Self

Converts to this type from the input type.
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impl Hash for Path

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fn hash<H>(&self, state: &mut H)
where H: Hasher,

Feeds this value into the given Hasher. Read more
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fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher. Read more
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impl Parse for Path

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fn parse(input: ParseStream<'_>) -> Result<Self>

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impl PartialEq for Path

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fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl ToTokens for Path

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fn to_tokens(&self, tokens: &mut TokenStream)

Write self to the given TokenStream. Read more
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fn to_token_stream(&self) -> TokenStream

Convert self directly into a TokenStream object. Read more
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fn into_token_stream(self) -> TokenStream
where Self: Sized,

Convert self directly into a TokenStream object. Read more
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impl Eq for Path

Auto Trait Implementations§

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impl Freeze for Path

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impl RefUnwindSafe for Path

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impl !Send for Path

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impl !Sync for Path

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impl Unpin for Path

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impl UnwindSafe for Path

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> Spanned for T
where T: Spanned + ?Sized,

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fn span(&self) -> Span

Returns a Span covering the complete contents of this syntax tree node, or Span::call_site() if this node is empty.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.