public void ParseCatExpressionTest()
{
//Create parser and parse tokens
ExpressionParser expressionParser = new ExpressionParser(Init("expression+'symbol"));
Expression expression = expressionParser.ParseExpression();
//Check type of expression
Assert.AreEqual(typeof(CatExpression), expression.GetType());
CatExpression parsedCatExpression = (CatExpression)expression;
//Check expressions in catexpression
Assert.AreEqual(typeof(VarExpression), parsedCatExpression.GetLeftExpression().GetType());
Assert.AreEqual(typeof(SymExpression), parsedCatExpression.GetRightExpression().GetType());
VarExpression left = (VarExpression)parsedCatExpression.GetLeftExpression();
SymExpression right = (SymExpression)parsedCatExpression.GetRightExpression();
Assert.AreEqual("expression", left.GetVariableIdentifier());
Assert.AreEqual("symbol", right.GetSym());
}
/// <summary>
/// Interpret CatExpression
/// </summary>
/// <param name="expression">CatExpression to interpret</param>
public override void Visit(CatExpression expression)
{
//Concatenate two expressions
String tempExpressionText = "";
//Visit left
expression.GetLeftExpression().AcceptVisitor(this);
tempExpressionText += TextValue;
//Visit right
expression.GetRightExpression().AcceptVisitor(this);
tempExpressionText += TextValue;
TextValue = tempExpressionText;
}
