static bool CheckUnderscore(string id, UnderscoreHandling handling)
{
for (int i = 1; i < id.Length; i++)
{
char ch = id[i];
if (ch == '_' && !HandleUnderscore(handling, id, ref i))
{
return(false);
}
}
return(true);
}
static bool HandleUnderscore(UnderscoreHandling handling, string id, ref int i)
{
switch (handling)
{
case UnderscoreHandling.Forbid:
if (i + 1 < id.Length)
{
char ch = id[i + 1];
if (char.IsDigit(ch))
{
i++;
return(true);
}
}
return(false);
case UnderscoreHandling.Allow:
return(true);
case UnderscoreHandling.AllowWithLowerStartingLetter:
if (i + 1 < id.Length)
{
char ch = id[i + 1];
if (char.IsLetter(ch) && !char.IsLower(ch) || ch == '_')
{
return(false);
}
i++;
}
return(true);
case UnderscoreHandling.AllowWithUpperStartingLetter:
if (i + 1 < id.Length)
{
char ch = id[i + 1];
if (char.IsLetter(ch) && !char.IsUpper(ch) || ch == '_')
{
return(false);
}
i++;
}
return(true);
default:
throw new ArgumentOutOfRangeException();
}
}
static bool HandleUnderscore(UnderscoreHandling handling, string id, ref int i)
{
switch (handling) {
case UnderscoreHandling.Forbid:
if (i + 1 < id.Length) {
char ch = id [i + 1];
if (char.IsDigit(ch)) {
i++;
return true;
}
}
return false;
case UnderscoreHandling.Allow:
return true;
case UnderscoreHandling.AllowWithLowerStartingLetter:
if (i + 1 < id.Length) {
char ch = id [i + 1];
if (char.IsLetter(ch) && !char.IsLower(ch) || ch =='_')
return false;
i++;
}
return true;
case UnderscoreHandling.AllowWithUpperStartingLetter:
if (i + 1 < id.Length) {
char ch = id [i + 1];
if (char.IsLetter(ch) && !char.IsUpper(ch) || ch =='_')
return false;
i++;
}
return true;
default:
throw new ArgumentOutOfRangeException();
}
}
static bool CheckUnderscore(string id, UnderscoreHandling handling)
{
for (int i = 1; i < id.Length; i++) {
char ch = id [i];
if (ch == '_' && !HandleUnderscore(handling, id, ref i))
return false;
}
return true;
}