Struct rtlola_parser::ast::Expression

pub struct Expression {
    pub kind: ExpressionKind,
    pub id: NodeId,
    pub span: Span,
}

The Ast representation of a stream expression

Fields

kind: ExpressionKind

The kind of the root expression, e.g., stream access

id: NodeId

The id of the node in the Ast

span: Span

The span in the specification declaring the extend declaration

Implementations

impl Expression

pub fn parse_discrete_duration(&self) -> Result<u64, String>

Parses an expression into a duration for a discrete window ExpressionKind::DiscreteWindowAggregation

pub fn parse_frequency(&self) -> Result<UOM_Frequency, String>

Parses an expression into a frequency. Expression must be a positive numeric value with Hz unit.

pub fn parse_freqspec(&self) -> Result<UOM_Frequency, String>

Parses a frequency annotation. Expression must either be a frequency or a duration representing the period

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a copy of the value.

pub 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.