prometheus_parser/types/
group.rs

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// (C) Copyright 2019 Hewlett Packard Enterprise Development LP

use std::fmt;

use super::expression::{BExpression, Expression};
use super::misc::{Span, Subquery};
use super::return_value::{ReturnKind, ReturnValue};

/// An expression explicitly grouped in parens
#[derive(Debug, PartialEq, Clone)]
pub struct Group {
    pub expression: BExpression,
    pub subquery: Option<Subquery>,
    pub span: Option<Span>,
}

impl Group {
    pub fn new(expression: Expression) -> Self {
        Group {
            expression: Box::new(expression),
            subquery: None,
            span: None,
        }
    }

    pub fn subquery(mut self, subquery: Subquery) -> Self {
        self.subquery = Some(subquery);
        self
    }

    pub fn clear_subquery(mut self) -> Self {
        self.subquery = None;
        self
    }

    pub fn span<S: Into<Span>>(mut self, span: S) -> Self {
        self.span = Some(span.into());
        self
    }

    /// Wraps this function in an Expression
    pub fn wrap(self) -> Expression {
        Expression::Group(self)
    }

    pub fn return_value(&self) -> ReturnValue {
        let mut ret = self.expression.return_value();

        if self.subquery.is_some() {
            ret.kind = match ret.kind {
                ReturnKind::InstantVector => ReturnKind::RangeVector,
                _ => ReturnKind::unknown(
                    format!(
                        "subquery on inner expression returning {:?} is invalid",
                        ret.kind
                    ),
                    self.clone().wrap(),
                ),
            };
        }

        ret
    }
}

impl fmt::Display for Group {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "({})", self.expression)?;

        if let Some(subquery) = &self.subquery {
            write!(f, "{}", subquery)?;
        }

        Ok(())
    }
}