Enum Expr 

#[non_exhaustive]
pub enum Expr {
    Predicate(Predicate),
    And(Vec<Expr>),
    Or(Vec<Expr>),
    Not(Box<Expr>),
    LinksTo(LinkPredicate),
    LinkedFrom(LinkPredicate),
}

A composable filter expression. The AST root for vault queries.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Predicate(Predicate)

A frontmatter or virtual-field predicate.

And(Vec<Expr>)

All sub-expressions must hold.

Or(Vec<Expr>)

At least one sub-expression must hold.

Not(Box<Expr>)

Negation of a sub-expression.

LinksTo(LinkPredicate)

Records that link out to a target matching the inner predicate.

LinkedFrom(LinkPredicate)

Records linked from anything matching the inner predicate.

Implementations

impl Expr

pub fn parse(input: &str) -> Result<Self>

Parse a where-DSL string into an Expr. Convenience wrapper over <Expr as FromStr>::from_str, so library users have an obvious discoverable entry point.

Trait Implementations

impl BitAnd for Expr

type Output = Expr

The resulting type after applying the & operator.

fn bitand(self, rhs: Expr) -> Expr

Performs the & operation.

impl BitOr for Expr

type Output = Expr

The resulting type after applying the | operator.

fn bitor(self, rhs: Expr) -> Expr

Performs the | operation.

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Expr

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl FromStr for Expr

type Err = VaultdbError

The associated error which can be returned from parsing.

fn from_str(input: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Not for Expr

type Output = Expr

The resulting type after applying the ! operator.

fn not(self) -> Expr

Performs the unary ! operation.

impl PartialEq for Expr

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

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Expr

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Expr