/// <summary>
/// Checks if the token accepts a context token before it.
/// Returns true if it does; False if it is null or does not.
/// </summary>
/// <param name="token">The token to check</param>
/// <returns>Flag indicating if the token can use a context type.</returns>
private bool TokenAcceptsContext(Token token)
{
if (token == null) return false;
return token.AcceptsContext();
}
/// <summary>
/// This methods compares the 2 input tokens by their stored integer positions and
/// returns a -1 if the first input token's position is smaller than the second.
/// A 1 is returned if the reverse is true.
/// No 2 tokens should have the same positions. However, should such an error arise, a 0 is returned.
/// </summary>
/// <param name="x">The first token</param>
/// <param name="y">The second token to be compared with</param>
/// <returns>-1, 1, or 0, indicating the results of the comparison</returns>
private int CompareByPosition(Token x, Token y)
{
int xPosition = x.Position;
int yPosition = y.Position;
if (xPosition < yPosition)
{
return -1;
}
else if (xPosition > yPosition)
{
return 1;
}
else
{
Debug.Assert(false, "Two tokens with same position!");
return 0;
}
}
