Module ast 

Abstract Syntax Tree (AST) types for PromQL expressions.

This module defines all the types that make up the parsed representation of a PromQL query. The main type is Expr, which represents any valid PromQL expression.

Overview

PromQL expressions can be:

• Literals: Numbers (Expr::Number) and strings (Expr::String)
• Selectors: Instant vectors (Expr::VectorSelector) and range vectors (Expr::MatrixSelector)
• Operations: Binary (Expr::Binary) and unary (Expr::Unary) expressions
• Functions: Function calls (Expr::Call) and aggregations (Expr::Aggregation)
• Subqueries: Range queries over instant vectors (Expr::Subquery)

Display

All AST types implement std::fmt::Display to convert back to PromQL syntax:

use rusty_promql_parser::expr;

let (_, ast) = expr("sum(rate(http_requests[5m]))").unwrap();
println!("{}", ast); // Prints: sum(rate(http_requests[5m]))

Structs

Aggregation

Aggregation expression

BinaryExpr

Binary expression

BinaryModifier

Modifier for binary operations

Call

Function call expression

GroupModifier

Group modifier for many-to-one/one-to-many matching

SubqueryExpr

Subquery expression

UnaryExpr

Unary expression

VectorMatching

Vector matching specification for binary operations

Enums

BinaryOp

Binary operators

Expr

Root expression type for PromQL AST

GroupSide

Group modifier side

UnaryOp

Unary operators

VectorMatchingOp

Vector matching for binary operations