Struct bevy::reflect::ParsedPath

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pub struct ParsedPath(pub Vec<OffsetAccess>);
Expand description

A pre-parsed path to an element within a type.

This struct can be constructed manually from its Accesses or with the parse method.

This struct may be used like GetPath but removes the cost of parsing the path string at each element access.

It’s recommended to use this in place of GetPath when the path string is unlikely to be changed and will be accessed repeatedly.

Examples

Parsing a &'static str:

let my_static_string: &'static str = "bar#0.1[2].0";
// Breakdown:
//   "bar" - Access struct field named "bar"
//   "#0" - Access struct field at index 0
//   ".1" - Access tuple struct field at index 1
//   "[2]" - Access list element at index 2
//   ".0" - Access tuple variant field at index 0
let my_path = ParsedPath::parse_static(my_static_string);

Parsing a non-static &str:

let my_string = String::from("bar#0.1[2].0");
// Breakdown:
//   "bar" - Access struct field named "bar"
//   "#0" - Access struct field at index 0
//   ".1" - Access tuple struct field at index 1
//   "[2]" - Access list element at index 2
//   ".0" - Access tuple variant field at index 0
let my_path = ParsedPath::parse(&my_string);

Manually constructing a ParsedPath:

let path_elements = [
    Access::Field(Cow::Borrowed("bar")),
    Access::FieldIndex(0),
    Access::TupleIndex(1),
    Access::ListIndex(2),
    Access::TupleIndex(1),
];
let my_path = ParsedPath::from(path_elements);

Tuple Fields§

§0: Vec<OffsetAccess>

This is a vector of pre-parsed OffsetAccesses.

Implementations§

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impl ParsedPath

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pub fn parse(string: &str) -> Result<ParsedPath, ReflectPathError<'_>>

Parses a ParsedPath from a string.

Returns an error if the string does not represent a valid path to an element.

The exact format for path strings can be found in the documentation for GetPath. In short, though, a path consists of one or more chained accessor strings. These are:

  • Named field access (.field)
  • Unnamed field access (.1)
  • Field index access (#0)
  • Sequence access ([2])
Example
#[derive(Reflect)]
struct Foo {
  bar: Bar,
}

#[derive(Reflect)]
struct Bar {
  baz: Baz,
}

#[derive(Reflect)]
struct Baz(f32, Vec<Option<u32>>);

let foo = Foo {
  bar: Bar {
    baz: Baz(3.14, vec![None, None, Some(123)])
  },
};

let parsed_path = ParsedPath::parse("bar#0.1[2].0").unwrap();
// Breakdown:
//   "bar" - Access struct field named "bar"
//   "#0" - Access struct field at index 0
//   ".1" - Access tuple struct field at index 1
//   "[2]" - Access list element at index 2
//   ".0" - Access tuple variant field at index 0

assert_eq!(parsed_path.element::<u32>(&foo).unwrap(), &123);
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pub fn parse_static( string: &'static str ) -> Result<ParsedPath, ReflectPathError<'static>>

Similar to Self::parse but only works on &'static str and does not allocate per named field.

Trait Implementations§

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impl Clone for ParsedPath

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fn clone(&self) -> ParsedPath

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 ParsedPath

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

Formats the value using the given formatter. Read more
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impl Display for ParsedPath

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

Formats the value using the given formatter. Read more
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impl<const N: usize> From<[Access<'static>; N]> for ParsedPath

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fn from(value: [Access<'static>; N]) -> ParsedPath

Converts to this type from the input type.
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impl<const N: usize> From<[OffsetAccess; N]> for ParsedPath

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fn from(value: [OffsetAccess; N]) -> ParsedPath

Converts to this type from the input type.
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impl From<Vec<Access<'static>>> for ParsedPath

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fn from(value: Vec<Access<'static>>) -> ParsedPath

Converts to this type from the input type.
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impl From<Vec<OffsetAccess>> for ParsedPath

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fn from(value: Vec<OffsetAccess>) -> ParsedPath

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

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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 Index<usize> for ParsedPath

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type Output = OffsetAccess

The returned type after indexing.
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fn index(&self, index: usize) -> &<ParsedPath as Index<usize>>::Output

Performs the indexing (container[index]) operation. Read more
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impl IndexMut<usize> for ParsedPath

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fn index_mut( &mut self, index: usize ) -> &mut <ParsedPath as Index<usize>>::Output

Performs the mutable indexing (container[index]) operation. Read more
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impl Ord for ParsedPath

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fn cmp(&self, other: &ParsedPath) -> Ordering

This method returns an Ordering between self and other. Read more
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fn max(self, other: Self) -> Self
where Self: Sized,

Compares and returns the maximum of two values. Read more
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fn min(self, other: Self) -> Self
where Self: Sized,

Compares and returns the minimum of two values. Read more
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fn clamp(self, min: Self, max: Self) -> Self
where Self: Sized + PartialOrd,

Restrict a value to a certain interval. Read more
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impl PartialEq for ParsedPath

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fn eq(&self, other: &ParsedPath) -> 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 PartialOrd for ParsedPath

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fn partial_cmp(&self, other: &ParsedPath) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
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fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator. Read more
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fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
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impl<'a> ReflectPath<'a> for &'a ParsedPath

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fn reflect_element( self, root: &(dyn Reflect + 'static) ) -> Result<&(dyn Reflect + 'static), ReflectPathError<'a>>

Gets a reference to the specified element on the given Reflect object. Read more
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fn reflect_element_mut( self, root: &mut (dyn Reflect + 'static) ) -> Result<&mut (dyn Reflect + 'static), ReflectPathError<'a>>

Gets a mutable reference to the specified element on the given Reflect object. Read more
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fn element<T>( self, root: &(dyn Reflect + 'static) ) -> Result<&T, ReflectPathError<'a>>
where T: Reflect,

Gets a &T to the specified element on the given Reflect object. Read more
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fn element_mut<T>( self, root: &mut (dyn Reflect + 'static) ) -> Result<&mut T, ReflectPathError<'a>>
where T: Reflect,

Gets a &mut T to the specified element on the given Reflect object. Read more
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impl Eq for ParsedPath

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impl StructuralEq for ParsedPath

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impl StructuralPartialEq for ParsedPath

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Compare self to key and return their ordering.
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