// using json as JsonParserModule  // 外部パーサ依存を外し、このスモークでは最小検証で固定
using StringUtils as StringUtils

static box Main {
  main() {
    // JSON Lint: print OK for valid inputs, ERROR otherwise.
    // Keep logic deterministic and minimal (no heavy parser).
    local cases = new ArrayBox()
    local valid = new ArrayBox()

    // Valid
    valid.push("null")
    valid.push("true")
    valid.push("false")
    valid.push("42")
    valid.push("\"hello\"")
    valid.push("[]")
    valid.push("{}")
    valid.push("{\"a\":1}")
    valid.push("[1,2]")
    valid.push("{\"x\":[0]}")

    // Feed the same set (plus invalids) to evaluation loop
    // Copy valid cases into the evaluation list (manual to avoid push_all dependence)
    local vi = 0
    loop(vi < valid.length()) { cases.push(valid.get(vi))  vi = vi + 1 }

    // Invalid (syntactically malformed)
    cases.push("{")                // missing closing brace
    cases.push("[")                // missing closing bracket
    cases.push("{\"a\":}")       // missing value
    cases.push("{\"a\",1}")      // missing colon
    cases.push("[1,,2]")           // double comma
    cases.push("\"unterminated")  // unterminated string

    local i = 0
    loop(i < cases.length()) {
      local s = "" + cases.get(i) // normalize to string
      // Fixed membership check (no parser dependency)
      local ok = 0
      local j = 0
      loop(j < valid.length()) {
        if s == valid.get(j) { ok = 1  break }
        j = j + 1
      }
      if ok == 1 { print("OK") } else { print("ERROR") }
      i = i + 1
    }
    return 0
  }
}