/// <summary>
/// Initializes a new instance of the <see cref="ExpressionTree"/> class.
/// </summary>
/// <param name="expression">Symbolic expression (e.g. "sin(x^2) + 10/x").</param>
/// <exception cref="ArgumentException">
/// <para><paramref name="expression"/> has unknown tokens.</para>
/// </exception>
/// <exception cref="ArgumentNullException">
/// <para><paramref name="serviceProvider"/> is <see langword="null"/>.</para>
/// -or-
/// <para><paramref name="expression"/> is <see langword="null"/>.</para>
/// -or-
/// <para><paramref name="expression"/> is an empty string.</para>
/// </exception>
/// <exception cref="ExpressionSyntaxException">Specified <paramref name="expression"/> has syntax errors.</exception>
public ExpressionTree(INuGenServiceProvider serviceProvider, String expression)
{
if (serviceProvider == null)
{
throw new ArgumentNullException("serviceProvider");
}
if (String.IsNullOrEmpty(expression))
{
throw new ArgumentNullException("expression");
}
_serviceProvider = serviceProvider;
_expression = expression;
ExpressionToken[] tokens = ExpressionToken.GetTokens(ServiceProvider, expression);
foreach (ExpressionToken token in tokens)
{
if (token.IsUnknownToken)
{
throw new ArgumentException(String.Format(Resources.Argument_UnknownToken, _expression, token.TokenBody));
}
}
_parsedExpression = "";
CreateTree(tokens);
_variables = (String[])new ArrayList(FindVariables(_root).Keys).ToArray(typeof(String));
}