在查看了类似的问题后，我的假设是，如果不使用巨大的 switch 语句，就不可能动态生成股票代码字符串，如下所示。真的是这样吗，还是在 pinescript @version=v5 中有一种方法可以更有效地实现我的目标？
//@version=5
indicator("String Test Script")
// Example: Load BINANCE:DOGEUSDT in the chart with this script running
// GOAL is to remove the USD* string from the ticker string
// eg DOGEUSDT -> DOGE
// so that we can request dominance symbol data
// eg DOGEUSDT -> DOGE -> DOGE.D
// Split the string "DOGEUSDT" -> string[] ["DOGE", "T"]
_array = str.split(syminfo.ticker, "USD")
// Take only the first item and convert to string
string asset_fail = str.tostring(array.get(_array, 0))
// Create the new dominance symbol "DOGE" -> "DOGE.d"
string dom_fail = str.format("{0}.d", asset_fail)
// Request the data
float data_fail = request.security (dom_fail, "D", close)
// ^^^ FAIL's with error shown below
plot(data_fail)
// ------ ERROR ---------------------------------------------------------------
// line 23: Cannot call 'request.security' with argument 'symbol'='symbol'.
// An argument of 'series string' type was used but a 'simple string' is expected
// ----------------------------------------------------------------------------
// THIS approach works, but requires a massively long (slow) switch statement
// that must manually cover each possible tickerUSD[.*] combination
asset_ok = switch syminfo.ticker
'DOGEUSD' => 'DOGE'
'DOGEUSDC' => 'DOGE'
'DOGEUSDT' => 'DOGE'
'BTCUSD' => 'BTC'
'BTCUSDC' => 'BTC'
'BTCUSDT' => 'BTC'
// ... and more tickerUSD* combo's here
=> 'UNKNOWN TICKER'
// Create the new dominance symbol "DOGE" -> "DOGE.d"
string dom_ok = str.format("{0}.d", asset_ok)
// Request the data
float data_ok = request.security (dom_ok, "D", close)
plot(data_ok)
我已审查
- https://www.tradingview.com/pine-script-docs/en/v5/language/Type_system.html
- Pine Script 有替代或替换功能吗？
- Pine 脚本系列[字符串] 到字符串的转换
- ... 和更多
即使使用@version=v5，似乎仍然不可能有任何其他方式
如果这是真的，关于如何避免创建一个覆盖十个，而不是数百个可能的tickerUSD [。*]组合的switch语句以返回一个与request.security（）一起使用的常量字符串的任何建议？还是我暂时坚持将其作为最佳解决方案？