/// <summary>
/// Visit method which is invoked when visitor operates on SyntaxTree
/// </summary>
/// <param name="statement">The Syntax Tree</param>
public void Visit(SyntaxTree statement)
{
foreach (var s in statement.Statements)
{
s.Accept(this);
}
}
/// <summary>
/// Visit method which is invoked when visitor operates on SyntaxTree
/// The indent is increased for each syntax tree.
/// Writes start and end of the method to the console.
/// </summary>
/// <param name="statement">The Syntax Tree</param>
public void Visit(SyntaxTree statement)
{
Write("Start visit SyntaxTree");
_indent++;
foreach (var s in statement.Statements)
{
s.Accept(this);
}
_indent--;
Write("End visit SyntaxTree");
}
public void Visitor_Should_FindAllValueStatements()
{
// Arrange
var firstValue = "1";
var fifthValue = "5";
// Create first statement
var valueStatement1a = new ValueStatement(firstValue);
var valueStatement1b = new ValueStatement("2");
var binaryStatement1 = new BinaryStatement(valueStatement1a, valueStatement1b);
// Create second statement (nested)
var valueStatement2a = new ValueStatement("3");
var valueStatement22a = new ValueStatement("4");
var valueStatement22b = new ValueStatement(fifthValue);
var binaryStatement22 = new BinaryStatement(valueStatement22a, valueStatement22b);
var binaryStatement2 = new BinaryStatement(valueStatement2a, binaryStatement22);
var syntaxTree = new SyntaxTree(new[] { binaryStatement1, binaryStatement2 });
var result = new List<string>();
var syntaxTreeValueVisitor = new SyntaxTreeValueVisitor();
syntaxTreeValueVisitor.VisitResultEvent += (sender, e) =>
{
Trace.WriteLine(string.Format("Level {0}, Value Expression {1}", e.Depth, e.Value));
result.Add(e.Value);
};
// Act
// Run through the syntax tree with the simple value visitor
Trace.WriteLine("Start SyntaxTreeValueVisitor");
syntaxTree.Accept(syntaxTreeValueVisitor);
Trace.WriteLine("End SyntaxTreeValueVisitor");
Trace.WriteLine(string.Empty);
// Run through the syntax tree with the indent visitor
Trace.WriteLine("Start SyntaxTreeIndendedVisitor");
syntaxTree.Accept(new SyntaxTreeIndentVisitor());
Trace.WriteLine("End SyntaxTreeIndendedVisitor");
// Assert
Assert.AreEqual(5, result.Count);
Assert.AreEqual(firstValue, result[0]);
Assert.AreEqual(fifthValue, result[4]);
}