YourLang {
  // Entry point
  Program = Statement*

  // Statements
  Statement = LiveDecl
            | ComputedDecl
            | TrackStmt
            | VarDecl
            | ExprStatement
            | Block

  // Reactive declarations
  LiveDecl = "live" identifier "=" Expr

  ComputedDecl = "computed" identifier Block

  TrackStmt = "track" ListOf<identifier, ","> LambdaParams? Block

  // Regular variable declarations
  VarDecl = VarType identifier "=" Expr
  VarType = "const" | "var" | "let"

  // Expression statement (for function calls, etc)
  ExprStatement = Expr

  // Blocks and lambdas
  Block = "{" Statement* "}"
  
  LambdaParams = "|" ListOf<identifier, ","> "|"

  // Expressions (precedence from loose to tight)
  Expr = AssignExpr

  AssignExpr = CompareExpr ("=" CompareExpr)?

  CompareExpr = AddExpr (CompareOp AddExpr)?
  CompareOp = "==" | "!=" | "<=" | ">=" | "<" | ">"

  AddExpr = MulExpr (("+"|"-") MulExpr)*

  MulExpr = UnaryExpr (("*"|"/"|"%") UnaryExpr)*

  UnaryExpr = "!" UnaryExpr
            | "-" UnaryExpr
            | CallExpr

  CallExpr = MemberExpr ("(" ListOf<Expr, ","> ")")?

  MemberExpr = PrimaryExpr ("." identifier)*

  PrimaryExpr = number
              | string
              | boolean
              | identifier
              | "(" Expr ")"
              | Block  // Block expressions

  // Literals
  number = digit+ ("." digit+)?

  string = "\"" (~"\"" any)* "\""
         | "'" (~"'" any)* "'"
         | "`" templateChar* "`"
  
  templateChar = ~"`" any

  boolean = "true" | "false"

  // Identifiers and keywords
  identifier = ~keyword letter (letter | digit | "_")*

  keyword = "live" | "computed" | "track" | "const" | "var" | "let" 
          | "true" | "false" | "if" | "else" | "for" | "while"

  // Lexical rules
  space += "//" (~"\n" any)*  // Single-line comments
         | "/*" (~"*/" any)* "*/"  // Multi-line comments
}