Parsing and Syntax Tree

Gridify internally uses a syntax tree to generate the expression tree used for filtering or ordering objects based on their members. If you need more control or insights into the SyntaxTree, you can use the following extension methods in the Gridify.Syntax namespace.

SyntaxTree

The SyntaxTree always starts at the root of the tree and can be accessed by the Root property.

var root = SyntaxTree.Parse(filterings).Root; // ISyntaxNode

Descendants

To get all syntax nodes (self and descendants) of the syntax tree, you can use the Descendants method.

var filterings = "name = Jack, arrayProp[8] > 10, dictProp[name] = John";

var syntaxNodes = SyntaxTree.Parse(filterings).Root.Descendants();

var expressions = syntaxNodes.OfType<ExpressionSyntax>();
var valueExpressions = syntaxNodes.OfType<ValueExpressionSyntax>();
var fieldExpressions = syntaxNodes.OfType<FieldExpressionSyntax>();
var binaryExpressions = syntaxNodes.OfType<BinaryExpressionSyntax>();
var parenthesizedExpressions = syntaxNodes.OfType<ParenthesizedExpressionSyntax>();

DistinctFieldExpressions

To get all distinct field expression syntax nodes (self and descendants) of the syntax tree, you can use the DistinctFieldExpressions method.

var filterings = "name = Jack, arrayProp[8] > 10, dictProp[name] = John";

var fieldExpressions = SyntaxTree.Parse(filterings).Root.DistinctFieldExpressions();

Direct Parsing

If you would like to parse a filtering or ordering string directly, you can use the following methods: ParseFilterings and ParseOrderings.

ParseFilterings

var filterings = SyntaxTree.ParseFilterings("name = Jack, arrayProp[8] > 10, dictProp[name] = John");

foreach (var filtering in filterings)
{
    Console.WriteLine(filtering.MemberName);
}

// name
// arrayProp
// dictProp

ParseOrderings

var orderings = SyntaxTree.ParseOrderings("Id desc, FirstName asc, LastName");

foreach (var ordering in orderings)
{
    Console.WriteLine(ordering.MemberName);
}

// Id
// FirstName
// LastName