Varpulis Core

Foundational types and AST definitions for the VPL language.

This crate provides the core data structures used throughout the Varpulis streaming analytics engine, including:

• AST (Abstract Syntax Tree): Complete representation of VPL programs
• Type System: Type definitions for the language
• Values: Runtime value representation
• Source Spans: Location tracking for error reporting

Features

• Zero-copy parsing support via spans
• Serialization support via serde
• Comprehensive AST for all VPL constructs

Modules

• [ast]: Program structure, statements, expressions, and SASE patterns
• [types]: Type system definitions (Int, Float, String, etc.)
• [value]: Runtime values with type coercion and operations
• [span]: Source location tracking for diagnostics

Quick Start

use varpulis_core::{Program, Stmt, Value};

// Values are the runtime representation
let int_val = Value::Int(42);
let float_val = Value::Float(3.14);
let str_val = Value::Str("hello".into());

// Check value types
assert!(int_val.is_int());
assert!(float_val.is_float());

AST Structure

A VPL program consists of statements:

• StreamDecl: Stream definitions with operations
• EventDecl: Event type definitions
• PatternDecl: SASE+ pattern definitions
• FnDecl: User-defined functions
• Config: Configuration blocks

See Also

• varpulis_parser: Parsing VPL source code
• varpulis_runtime: Executing VPL programs