static box Main {
  main(args) {
    // JSON v0 Program with mixed Print expressions
    local json = "{\"kind\":\"Program\",\"statements\":[{\"kind\":\"Print\",\"expression\":{\"kind\":\"Literal\",\"value\":{\"type\":\"string\",\"value\":\"A\"}}},{\"kind\":\"Print\",\"expression\":{\"kind\":\"FunctionCall\",\"name\":\"echo\",\"arguments\":[{\"kind\":\"Literal\",\"value\":{\"type\":\"string\",\"value\":\"B\"}}]}},{\"kind\":\"Print\",\"expression\":{\"kind\":\"FunctionCall\",\"name\":\"itoa\",\"arguments\":[{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":7}}]}},{\"kind\":\"Print\",\"expression\":{\"kind\":\"Compare\",\"operation\":\"<\",\"lhs\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":1}},\"rhs\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":2}}}},{\"kind\":\"Print\",\"expression\":{\"kind\":\"BinaryOp\",\"operator\":\"+\",\"left\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":3}},\"right\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":4}}}},{\"kind\":\"Print\",\"expression\":{\"kind\":\"Literal\",\"value\":{\"type\":\"int\",\"value\":5}}}]}"

    local doc = new JsonDocBox()
    doc.parse(json)
    local root = doc.root()
    local stmts = root.get("statements")
    local n = stmts.size()
    local i = 0
    loop (i < n) {
      local node = stmts.at(i)
      local expr = node.get("expression")
      local kind = expr.get("kind").str()
      if kind == "Literal" {
        local val = expr.get("value")
        local ty = val.get("type").str()
        if ty == "string" { print(val.get("value").str()) } else { print(val.get("value").int()) }
      } else if kind == "FunctionCall" {
        local name = expr.get("name").str()
        // First argument as typed literal object { type, value }
        local arg0 = expr.get("arguments").at(0).get("value")
        if name == "echo" {
          if arg0.get("type").str() == "string" { print(arg0.get("value").str()) } else { print(arg0.get("value").int()) }
        }
        if name == "itoa" { print(arg0.get("value").int()) }
      } else if kind == "Compare" {
        local op = expr.get("operation").str()
        local lhs = expr.get("lhs").get("value").get("value").int()
        local rhs = expr.get("rhs").get("value").get("value").int()
        if op == "<" {
          if lhs < rhs { print(1) } else { print(0) }
        }
        if op == "==" {
          if lhs == rhs { print(1) } else { print(0) }
        }
        if op == ">" {
          if lhs > rhs { print(1) } else { print(0) }
        }
      } else if kind == "BinaryOp" {
        local op = expr.get("operator").str()
        if op == "+" {
          local left = expr.get("left").get("value").get("value").int()
          local right = expr.get("right").get("value").get("value").int()
          print(left + right)
        }
      }
      i = i + 1
    }
    return 0
  }
}