Enum Expression 

pub enum Expression {
    Conditional(ConditionalExpression),
    Constant(ConstantExpression),
    FunctionCall(FunctionCallExpression),
    MemberAccess(MemberAccessExpression),
    Parameter(ParameterExpression),
    Keyword(KeywordExpression),
    Unary(UnaryExpression),
    Binary(BinaryExpression),
}

A parsed composition expression.

Variants

Conditional(ConditionalExpression)

Constant(ConstantExpression)

FunctionCall(FunctionCallExpression)

MemberAccess(MemberAccessExpression)

Parameter(ParameterExpression)

Keyword(KeywordExpression)

Unary(UnaryExpression)

Binary(BinaryExpression)

Implementations

impl Expression

pub fn expression_type(&self) -> ExpressionType

The kind of the node.

pub fn parse(expression: &str) -> Result<Expression, ExpressionParseException>

Parses an expression.

pub fn evaluate( &self, context: &ExpressionEvaluationContext<'_>, ) -> ExpressionVariant

Evaluates the expression. Anything that cannot be evaluated (an unknown parameter, member or function, mismatched operand types) gives an invalid variant.

Panics

Panics when the expression reads a member of this.Target and the context has no target, or calls a function and the context has no foreign function interface (programmer errors).

pub fn collect_references(&self, references: &mut HashSet<(String, String)>)

Collects the (parameter, property) pairs the expression reads. Members of this.Target are collected with the parameter name ExpressionKeywords::TARGET.

pub fn operator_name(t: ExpressionType) -> &'static str

The text of an operator, or the name of the expression type for the types that are not operators.

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expression

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

Formats the value using the given formatter.

impl Display for Expression

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

Formats the value using the given formatter.

impl From<BinaryExpression> for Expression

fn from(value: BinaryExpression) -> Expression

Converts to this type from the input type.

impl From<ConditionalExpression> for Expression

fn from(value: ConditionalExpression) -> Expression

Converts to this type from the input type.

impl From<ConstantExpression> for Expression

fn from(value: ConstantExpression) -> Expression

Converts to this type from the input type.

impl From<FunctionCallExpression> for Expression

fn from(value: FunctionCallExpression) -> Expression

Converts to this type from the input type.

impl From<KeywordExpression> for Expression

fn from(value: KeywordExpression) -> Expression

Converts to this type from the input type.

impl From<MemberAccessExpression> for Expression

fn from(value: MemberAccessExpression) -> Expression

Converts to this type from the input type.

impl From<ParameterExpression> for Expression

fn from(value: ParameterExpression) -> Expression

Converts to this type from the input type.

impl From<UnaryExpression> for Expression

fn from(value: UnaryExpression) -> Expression

Converts to this type from the input type.

impl PartialEq for Expression

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Expression