I'll probably add an argument to take an optional object arg and then do a refined display of the object and its address without some of the parameters and syntax swift's builtin obj dump logging does, so that it would display obj info and where it is being traced.
This probably can only parse lines inside the app. It probably can't demangle non-Swift calls (like Foundation), not sure. If you need a more comprehensive demangler, check @MikeS's answer.
static func whence(_ lineNumber: Int = #line) {
func matchRegex(_ matcher: String, string : String) -> String? {
let regex = try! NSRegularExpression(pattern: matcher, options: [])
let range = NSRange(string.startIndex ..< string.endIndex, in: string)
guard let textCheckingResult = regex.firstMatch(in: string, options: [], range: range) else {
return nil
}
return (string as NSString).substring(with:textCheckingResult.range(at:1)) as String
}
func singleMatchRegex(_ matcher: String, string : String) -> String? {
let regex = try! NSRegularExpression(pattern: matcher, options: [])
let range = NSRange(string.startIndex ..< string.endIndex, in: string)
let matchRange = regex.rangeOfFirstMatch(in: string, range: range)
if matchRange == NSMakeRange(NSNotFound, 0) {
return nil
}
return (string as NSString).substring(with: matchRange) as String
}
var string = Thread.callStackSymbols[1]
string = String(string.suffix(from:string.firstIndex(of: "$")!))
let appNameLenString = matchRegex(#"\$s(\d*)"#, string: string)!
let appNameLen = Int(appNameLenString)!
string = String(string.dropFirst(appNameLenString.count + 2))
let appName = singleMatchRegex(".{\(appNameLen)}", string: string)!
string = String(string.dropFirst(appNameLen))
let classNameLenString = singleMatchRegex(#"\d*"#, string: string)!
let classNameLen = Int(classNameLenString)!
string = String(string.dropFirst(classNameLenString.count))
let className = singleMatchRegex(".{\(classNameLen)}", string: string)!
string = String(string.dropFirst(classNameLen))
let methodNameLenString = matchRegex(#".(\d*)"#, string: string)!
let methodNameLen = Int(methodNameLenString)!
string = String(string.dropFirst(methodNameLenString.count + 1))
let methodName = singleMatchRegex(".{\(methodNameLen)}", string: string)!
let _ = appName
print("\(className).\(methodName)():\(lineNumber)")
}