private void decipher_unquoted_state()
{
string curupper = cur.ToUpper();
foreach (string word in sqlkeywords)
if (curupper == word)
{
curstate = VxSqlToken.TokenType.Keyword;
break;
}
}
public void tokenize(string q)
{
last = null;
tokens = new List<VxSqlToken>();
reset_state();
for (int i = 0; i < q.Length; ++i)
{
char c = q[i];
char peek = i < q.Length - 1 ? q[i + 1] : '\0';
switch (curstate)
{
case VxSqlToken.TokenType.None:
VxSqlToken.TokenType singletoken_state = get_singletoken_state(c);
if (isalpha(c) || c == '_' || c == '@' || c == '#')
{
curstate = VxSqlToken.TokenType.Unquoted;
cur += c;
if (!isidentifierchar(peek))
{
decipher_unquoted_state();
save_and_reset_state();
}
}
else if (c == '\'')
curstate = VxSqlToken.TokenType.SingleQuoted;
else if (c == '"')
curstate = VxSqlToken.TokenType.DoubleQuoted;
else if (c == '[')
curstate = VxSqlToken.TokenType.Delimited;
else if (c == '-' && peek == '-')
{
++i;
curstate = VxSqlToken.TokenType.Comment;
}
else if (c == '/' && peek == '*')
{
++i;
curstate = VxSqlToken.TokenType.DelimitedComment;
}
else if (isdigit(c))
{
curstate = VxSqlToken.TokenType.Numeric;
cur += c;
if (!isnumericchar(peek))
save_and_reset_state();
}
else if (c == '.' && isdigit(peek))
{
curstate = VxSqlToken.TokenType.Numeric;
cur += c;
}
else if (singletoken_state != VxSqlToken.TokenType.None)
{
cur += c;
curstate = singletoken_state;
save_and_reset_state();
}
else if (!isspace(c))
{
cur += c;
curstate = VxSqlToken.TokenType.ERROR_UNKNOWN;
save_and_reset_state();
}
else //whitespace
curspace += c;
break;
case VxSqlToken.TokenType.Unquoted:
cur += c;
if (!isidentifierchar(peek))
{
decipher_unquoted_state();
save_and_reset_state();
}
break;
case VxSqlToken.TokenType.SingleQuoted:
if (c == '\'')
{
if (peek == '\'')
{
cur += "''";
++i;
}
else
save_and_reset_state();
}
else
cur += c;
break;
case VxSqlToken.TokenType.DoubleQuoted:
if (c == '"')
{
if (peek == '"')
{
cur += "\"\"";
++i;
}
else
save_and_reset_state();
}
else
cur += c;
break;
case VxSqlToken.TokenType.Delimited:
if (c == ']')
save_and_reset_state();
else
cur += c;
break;
case VxSqlToken.TokenType.Comment:
// NOTE: In T-Sql, a 'GO' command within a comment generates an
// error, but our tokenizer doesn't need to care about this.
if (c == '\n')
{
save_and_reset_state();
curspace += c;
}
else
cur += c;
break;
case VxSqlToken.TokenType.DelimitedComment:
// NOTE: In T-Sql, a 'GO' command within a comment generates an
// error, but our tokenizer doesn't need to care about this.
if (c == '*' && peek == '/')
{
++i;
save_and_reset_state();
}
else
cur += c;
break;
case VxSqlToken.TokenType.Numeric:
if (c == 'E' || c == 'e')
{
curstate = VxSqlToken.TokenType.Scientific;
cur += 'e';
if (peek == '-' || peek == '+')
{
++i;
cur += peek;
}
else if (!isdigit(peek))
{
curstate = VxSqlToken.TokenType.Numeric;
save_and_reset_state();
}
}
else
{
cur += c;
if (!isnumericchar(peek))
save_and_reset_state();
}
break;
case VxSqlToken.TokenType.Scientific:
cur += c;
if (!isdigit(peek))
{
curstate = VxSqlToken.TokenType.Numeric;
save_and_reset_state();
}
break;
default:
break;
}
}
if (curstate != VxSqlToken.TokenType.None)
save_and_reset_state();
if (curspace != "")
{
if (last != null)
last.trailing_space = curspace;
else
{
last = new VxSqlToken(VxSqlToken.TokenType.None, "", curspace);
tokens.Add(last);
}
}
/*
Console.WriteLine("GOT A REQUEST FROM VERSAPLEX:");
Console.WriteLine("Original Query: {0}", q);
Console.WriteLine("Broken down:");
foreach (VxSqlToken t in tokens)
{
Console.WriteLine("Token: {0}: {1}", t.type.ToString(), t.name);
}
*/
}
private void reset_state()
{
cur = "";
curspace = "";
curstate = VxSqlToken.TokenType.None;
}