/// <summary>
/// Determines whether a particular string is a valid C# identifier. Legal
/// identifiers must start with a letter, and all the characters must be
/// letters or numbers. Underscore is considered a letter.
/// </summary>
private static bool IsLegalIdentifier
(
string identifier
)
{
// Must be non-empty.
if (identifier.Length == 0)
{
return(false);
}
// First character must be a letter.
// From 2.4.2 of the C# Language Specification
// identifier-start-letter-character:
if (
!TokenChar.IsLetter(identifier[0]) &&
(identifier[0] != '_')
)
{
return(false);
}
// All the other characters must be letters or numbers.
// From 2.4.2 of the C# Language Specification
// identifier-part-letter-character:
for (int i = 1; i < identifier.Length; i++)
{
char currentChar = identifier[i];
if (
!TokenChar.IsLetter(currentChar) &&
!TokenChar.IsDecimalDigit(currentChar) &&
!TokenChar.IsConnecting(currentChar) &&
!TokenChar.IsCombining(currentChar) &&
!TokenChar.IsFormatting(currentChar)
)
{
return(false);
}
}
return(true);
}
private static bool IsLegalIdentifier(string identifier)
{
if (identifier.Length == 0)
{
return(false);
}
if (!TokenChar.IsLetter(identifier[0]) && (identifier[0] != '_'))
{
return(false);
}
for (int i = 1; i < identifier.Length; i++)
{
char c = identifier[i];
if (((!TokenChar.IsLetter(c) && !TokenChar.IsDecimalDigit(c)) && (!TokenChar.IsConnecting(c) && !TokenChar.IsCombining(c))) && !TokenChar.IsFormatting(c))
{
return(false);
}
}
return(true);
}
