Parsey | Swift Parser Combinators | Parser library

indirect enum Expression {
    case integer(Int)
    case symbol(String)
    case infix(String, Expression, Expression)
}

enum Grammar {
    static let integer = Lexer.signedInteger
        ^^ {Int($0)!} ^^ Expression.integer

    static let symbol   

indirect enum Expr {
    case sExp([Expr], SourceRange)
    case int(Int, SourceRange)
    case id(String, SourceRange)
}

enum Grammar {
    static let whitespaces = (Lexer.space | Lexer.tab | Lexer.newLine)+

    static let anInt = Lexer.signedInte  

indirect enum Expr {
    case sExp([Expr])
    case int(Int)
    case id(String)
}

enum Grammar {
    static let whitespaces = (Lexer.space | Lexer.tab | Lexer.newLine)+
    static let anInt = Lexer.signedInteger ^^ { Int($0)! } ^^ Expr.int
    stat