public static IQueryable OrderBy(this IQueryable source, string ordering, QueryResolver queryResolver)
{
if (source == null)
throw new ArgumentNullException("source");
if (ordering == null)
throw new ArgumentNullException("ordering");
ParameterExpression[] parameters = new ParameterExpression[] {
Expression.Parameter(source.ElementType, "") };
ExpressionParser parser = new ExpressionParser(parameters, ordering, queryResolver);
IEnumerable<DynamicOrdering> orderings = parser.ParseOrdering();
Expression queryExpr = source.Expression;
string methodAsc = "OrderBy";
string methodDesc = "OrderByDescending";
foreach (DynamicOrdering o in orderings)
{
queryExpr = Expression.Call(
typeof(Queryable), o.Ascending ? methodAsc : methodDesc,
new Type[] { source.ElementType, o.Selector.Type },
queryExpr, Expression.Quote(DynamicExpression.Lambda(o.Selector, parameters)));
methodAsc = "ThenBy";
methodDesc = "ThenByDescending";
}
return source.Provider.CreateQuery(queryExpr);
}
/// <summary>
/// Evaluate a string expression to a boolean "True" or "False" (if possible).
/// An alternative to Evaluate that behaves nicely with the TextWindow.
/// </summary>
/// <param name="expression">The expression to evaluate to a boolean, e.g. "21.3 > 16".</param>
/// <returns>The evaluated result ("True" or "False").</returns>
public static Primitive Evaluate3(Primitive expression)
{
try
{
ParameterExpression pe = Expression.Parameter(typeof(string), "IntegerAsReal");
ExpressionParser parser = new ExpressionParser(new ParameterExpression[] { pe }, expression, null);
LambdaExpression expr = Expression.Lambda(parser.Parse(typeof(bool)), null);
var del = (Func<bool>)expr.Compile();
return del();
}
catch (Exception ex)
{
Utilities.OnError(Utilities.GetCurrentMethod(), ex);
return "";
}
}
public static LambdaExpression ParseLambda(IDynamicLinkCustomTypeProvider provider, ParameterExpression[] parameters, Type resultType, string expression, params object[] values)
{
ExpressionParser parser = new ExpressionParser(provider, parameters, expression, values);
return(Expression.Lambda(parser.Parse(resultType), parameters));
}
public static LambdaExpression ParseLambda(ParameterExpression[] parameters, Type resultType, string expression, params object[] values)
{
ExpressionParser parser = new ExpressionParser(parameters, expression, values);
return(Expression.Lambda(parser.Parse(resultType), parameters));
}
public static Expression Parse(Type resultType, string expression, params object[] values)
{
var parser = new ExpressionParser(null, expression, values);
return(parser.Parse(resultType));
}
private void ValidateToken(ExpressionParser.TokenId t)
{
if (this.token.id != t)
{
throw this.ParseError("Syntax error", new object[0]);
}
}
private void ValidateToken(ExpressionParser.TokenId t, string errorMessage)
{
if (this.token.id != t)
{
throw this.ParseError(errorMessage, new object[0]);
}
}
private static bool IsBetterThan(Expression[] args, ExpressionParser.MethodData m1, ExpressionParser.MethodData m2)
{
bool result = false;
for (int i = 0; i < args.Length; i++)
{
int num = ExpressionParser.CompareConversions(args[i].Type, m1.Parameters[i].ParameterType, m2.Parameters[i].ParameterType);
if (num < 0)
{
return false;
}
if (num > 0)
{
result = true;
}
}
return result;
}
private bool IsApplicable(ExpressionParser.MethodData method, Expression[] args)
{
if (method.Parameters.Length != args.Length)
{
return false;
}
Expression[] array = new Expression[args.Length];
for (int i = 0; i < args.Length; i++)
{
ParameterInfo parameterInfo = method.Parameters[i];
if (parameterInfo.IsOut)
{
return false;
}
Expression expression = this.PromoteExpression(args[i], parameterInfo.ParameterType, false);
if (expression == null)
{
return false;
}
array[i] = expression;
}
method.Args = array;
return true;
}
public static LambdaExpression ParseLambda(ParameterExpression[] parameters, Type resultType, string expression, params object[] values)
{
ExpressionParser parser = new ExpressionParser(parameters, expression, values);
return Expression.Lambda(parser.Parse(resultType), parameters);
}
protected override Expression VisitMember(MemberExpression m)
{
if (!this.isInProjection)
{
if (m.Member.MemberType == MemberTypes.Property)
{
PropertyDescriptor pd = TypeDescriptor.GetProperties(m.Member.DeclaringType)[m.Member.Name];
// Let properties for which no PropertyDescriptors exist go through. This happens when we
// deal with structs.
bool requiresValidation = !(pd == null && m.Member.DeclaringType.IsValueType);
if (requiresValidation && !this.IsVisible(pd))
{
if (!PostProcessor.IsProjectionPath(m))
{
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Resource.UnknownPropertyOrField, pd.Name, ExpressionParser.GetTypeName(pd.ComponentType)));
}
else
{
this.isInProjection = true;
Expression expr = base.VisitMember(m);
this.isInProjection = false;
return(expr);
}
}
}
}
return(base.VisitMember(m));
}
public static Expression Parse(Type resultType, string expression, ICollection <Type> additionalAllowedTypes = null, params object[] values)
{
var parser = new ExpressionParser(null, expression, values, additionalAllowedTypes);
return(parser.Parse(resultType));
}
public static LambdaExpression ParseLambda(ParameterExpression[] parameters, Type resultType, string expression, ICollection <Type> additionalAllowedTypes = null, params object[] values)
{
var parser = new ExpressionParser(parameters, expression, values, additionalAllowedTypes);
return(Expression.Lambda(parser.Parse(resultType), parameters));
}
public static LambdaExpression ParseLambda(ParameterExpression[] parameters, Type resultType, string expression, QueryResolver queryResolver)
{
ExpressionParser parser = new ExpressionParser(parameters, expression, queryResolver);
return Lambda(parser.Parse(resultType), parameters);
}
