private BranchedLexer(BranchedLexer parent)
{
_branches = parent._branches;
_branches.Add(this);
_buffer = new Queue <Token>(parent._buffer);
_lexer = parent._lexer;
}
/// <summary>
/// Merges the lexer to the state of another specified branch.
/// </summary>
/// <param name="branch">The specified branch.</param>
/// <exception cref="ObjectDisposedException">Methods were called after the object was disposed.</exception>
/// <exception cref="InvalidOperationException">The lexer has a different root with the specified branch.</exception>
/// <exception cref="ArgumentNullException">The parameter is <see langword="null"/>.</exception>
public void Merge(BranchedLexer branch)
{
if (branch == null)
{
throw new ArgumentNullException();
}
if (HasSameRoot(branch))
{
_buffer = new Queue <Token>(branch._buffer);
}
else
{
throw new InvalidOperationException(ExceptionResource.DifferentRoot);
}
}
/// <summary>
/// Returns a value indicating whether the lexer has the same root reader as another specified branch.
/// </summary>
/// <param name="branch">The specified branch.</param>
/// <returns><see langword="true"/> if the lexer has the same root reader as <paramref name="branch"/>; otherwise <see langword="false"/>.</returns>
/// <exception cref="ObjectDisposedException">Methods were called after the object was disposed.</exception>
/// <exception cref="ArgumentNullException">The parameter is <see langword="null"/>.</exception>
public bool HasSameRoot(BranchedLexer branch)
{
if (branch == null)
{
throw new ArgumentNullException();
}
if (!_branches.Contains(this))
{
throw new ObjectDisposedException(ToString());
}
else if (!_branches.Contains(branch))
{
throw new ObjectDisposedException(branch.ToString());
}
return(this._lexer.Equals(branch._lexer));
}