// ---- SECTION: private static methods that do the actual work ---------*
#region TryParseTimeSpan
//
// TryParseTimeSpan
//
// Actions: Common private Parse method called by both Parse and TryParse
//
private static Boolean TryParseTimeSpan(String input, TimeSpanStandardStyles style, IFormatProvider formatProvider, ref TimeSpanResult result) {
if (input == null) {
result.SetFailure(ParseFailureKind.ArgumentNull, "ArgumentNull_String", null, nameof(input));
return false;
}
input = input.Trim();
if (input == String.Empty) {
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
TimeSpanTokenizer tokenizer = new TimeSpanTokenizer();
tokenizer.Init(input);
TimeSpanRawInfo raw = new TimeSpanRawInfo();
raw.Init(DateTimeFormatInfo.GetInstance(formatProvider));
TimeSpanToken tok = tokenizer.GetNextToken();
/* The following loop will break out when we reach the end of the str or
* when we can determine that the input is invalid. */
while (tok.ttt != TTT.End) {
if (!raw.ProcessToken(ref tok, ref result)) {
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
tok = tokenizer.GetNextToken();
}
if (!tokenizer.EOL) {
// embedded nulls in the input string
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
if (!ProcessTerminalState(ref raw, style, ref result)) {
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
return true;
}
//
// ProcessTerminalState
//
// Actions: Validate the terminal state of a standard format parse.
// Sets result.parsedTimeSpan on success.
//
// Calculates the resultant TimeSpan from the TimeSpanRawInfo
//
// try => +InvariantPattern, -InvariantPattern, +LocalizedPattern, -LocalizedPattern
// 1) Verify Start matches
// 2) Verify End matches
// 3) 1 number => d
// 2 numbers => h:m
// 3 numbers => h:m:s | d.h:m | h:m:.f
// 4 numbers => h:m:s.f | d.h:m:s | d.h:m:.f
// 5 numbers => d.h:m:s.f
private static Boolean ProcessTerminalState(ref TimeSpanRawInfo raw, TimeSpanStandardStyles style, ref TimeSpanResult result) {
if (raw.lastSeenTTT == TTT.Num) {
TimeSpanToken tok = new TimeSpanToken();
tok.ttt = TTT.Sep;
tok.sep = String.Empty;
if (!raw.ProcessToken(ref tok, ref result)) {
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
}
switch (raw.NumCount) {
case 1:
return ProcessTerminal_D(ref raw, style, ref result);
case 2:
return ProcessTerminal_HM(ref raw, style, ref result);
case 3:
return ProcessTerminal_HM_S_D(ref raw, style, ref result);
case 4:
return ProcessTerminal_HMS_F_D(ref raw, style, ref result);
case 5:
return ProcessTerminal_DHMSF(ref raw, style, ref result);
default:
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
}
private static bool TryParseTimeSpan(string input, TimeSpanStandardStyles style, IFormatProvider formatProvider, ref TimeSpanResult result)
{
if (input == null)
{
result.SetFailure(ParseFailureKind.ArgumentNull, "ArgumentNull_String", null, "input");
return false;
}
input = input.Trim();
if (input == string.Empty)
{
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
TimeSpanTokenizer tokenizer = new TimeSpanTokenizer();
tokenizer.Init(input);
TimeSpanRawInfo raw = new TimeSpanRawInfo();
raw.Init(DateTimeFormatInfo.GetInstance(formatProvider));
for (TimeSpanToken token = tokenizer.GetNextToken(); token.ttt != TTT.End; token = tokenizer.GetNextToken())
{
if (!raw.ProcessToken(ref token, ref result))
{
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
}
if (!tokenizer.EOL)
{
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
if (!ProcessTerminalState(ref raw, style, ref result))
{
result.SetFailure(ParseFailureKind.Format, "Format_BadTimeSpan");
return false;
}
return true;
}