Enum BoolExpression 

pub enum BoolExpression {
    Literal(bool),
    GetProperty {
        key: String,
        fallback: bool,
    },
    GetState {
        key: String,
        fallback: bool,
    },
    Has(String),
    Not(Box<BoolExpression>),
    All(Vec<BoolExpression>),
    Any(Vec<BoolExpression>),
    Eq(NumericExpression, NumericExpression),
    Neq(NumericExpression, NumericExpression),
    Gt(NumericExpression, NumericExpression),
    Gte(NumericExpression, NumericExpression),
    Lt(NumericExpression, NumericExpression),
    Lte(NumericExpression, NumericExpression),
    StrEq(StringExpression, StringExpression),
}

A boolean expression that evaluates to bool.

Used as the condition in Case branches.

Variants

Literal(bool)

A constant boolean literal.

GetProperty

Read a boolean feature property.

Fields

key: String

Property key.

fallback: bool

Fallback when absent or non-boolean.

GetState

Read a boolean feature-state value.

Fields

key: String

State key.

fallback: bool

Fallback when absent or non-boolean.

Has(String)

Check whether a feature property key exists.

Not(Box<BoolExpression>)

Logical NOT.

All(Vec<BoolExpression>)

Logical AND (all must be true).

Any(Vec<BoolExpression>)

Logical OR (any must be true).

Eq(NumericExpression, NumericExpression)

Numeric equality: a == b.

Neq(NumericExpression, NumericExpression)

Numeric inequality: a != b.

Gt(NumericExpression, NumericExpression)

Greater than: a > b.

Gte(NumericExpression, NumericExpression)

Greater or equal: a >= b.

Lt(NumericExpression, NumericExpression)

Less than: a < b.

Lte(NumericExpression, NumericExpression)

Less or equal: a <= b.

StrEq(StringExpression, StringExpression)

String equality.

Implementations

impl BoolExpression

pub fn eval(&self, ctx: &ExprEvalContext<'_>) -> bool

Evaluate this boolean expression against a context.

impl BoolExpression

pub fn uses_feature_state(&self) -> bool

Whether this boolean expression references feature state.

Trait Implementations

impl Clone for BoolExpression

fn clone(&self) -> BoolExpression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BoolExpression

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

Formats the value using the given formatter.

impl PartialEq for BoolExpression

fn eq(&self, other: &BoolExpression) -> 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 StructuralPartialEq for BoolExpression