// Phase 165: Test _parse_string from JsonParserBox (Pattern4 with continue + return)
// Simulates: loop(p < len) { if quote { return } if escape { continue } else { append } p++ }

static box Main {
  main(args) {
    // Simulate string parsing: collect chars until closing quote
    // Pattern: continue on escape, return on quote
    local s = "hello\\\"world\"extra"
    local p = 0
    local len = s.length()
    local result = ""

    loop(p < len) {
      local ch = s.substring(p, p + 1)

      // Check for closing quote
      if ch == "\"" {
        print("Found closing quote at position: " + ("" + p))
        return 0
      }

      // Check for escape sequence
      if ch == "\\" {
        result = result + ch
        p = p + 1
        // Skip next character (continuation of escape)
        if p < len {
          result = result + s.substring(p, p + 1)
          p = p + 1
          continue
        }
      }

      // Regular character
      result = result + ch
      p = p + 1
    }

    // If we exit loop without finding quote, return error
    print("ERROR: No closing quote found")
    return 1
  }
}