Enum Expression

pub enum Expression {
    Arithmetic(Box<Expression>, ArithmeticOp, Box<Expression>),
    Relation(Box<Expression>, RelationOp, Box<Expression>),
    Ternary(Box<Expression>, Box<Expression>, Box<Expression>),
    Or(Box<Expression>, Box<Expression>),
    And(Box<Expression>, Box<Expression>),
    Unary(UnaryOp, Box<Expression>),
    Member(Box<Expression>, Box<Member>),
    FunctionCall(Box<Expression>, Option<Box<Expression>>, Vec<Expression>),
    List(Vec<Expression>),
    Map(Vec<(Expression, Expression)>),
    Atom(Atom),
    Ident(Arc<String>),
}

Variants

Arithmetic(Box<Expression>, ArithmeticOp, Box<Expression>)

Relation(Box<Expression>, RelationOp, Box<Expression>)

Ternary(Box<Expression>, Box<Expression>, Box<Expression>)

Or(Box<Expression>, Box<Expression>)

And(Box<Expression>, Box<Expression>)

Unary(UnaryOp, Box<Expression>)

Member(Box<Expression>, Box<Member>)

FunctionCall(Box<Expression>, Option<Box<Expression>>, Vec<Expression>)

List(Vec<Expression>)

Map(Vec<(Expression, Expression)>)

Atom(Atom)

Ident(Arc<String>)

Implementations

impl Expression

pub fn references(&self) -> ExpressionReferences<'_>

Returns a set of all variables referenced in the expression. Variable identifiers are represented internally as Arc<String> and this function simply clones those references into a HashSet.

Example

let expression = parse("foo && size(foo) > 0").unwrap();
let references = expression.references();

assert!(references.has_variable("foo"));
assert!(references.has_function("size"));

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expression

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

Formats the value using the given formatter.

impl PartialEq for Expression

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

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

const 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 StructuralPartialEq for Expression