public void EvaluateConcatenateExpressionUsingStrings()
{
IExpression expression = new ConcatenateExpression(new ConstantExpression("foo"), new ConstantExpression("bar"));
Assert.AreEqual("foobar", expression.Evaluate(null));
}
public void EvaluateConcatenateExpressionUsingIntegers()
{
IExpression expression = new ConcatenateExpression(new ConstantExpression(12), new ConstantExpression(34));
Assert.AreEqual("1234", expression.Evaluate(null));
}
private IExpression ParseSimpleTermExpression()
{
if (this.TryParse(TokenType.Name, "default"))
{
if (this.TryParse(TokenType.Name, "function") || this.TryParse(TokenType.Name, "sub"))
return this.ParseFunctionExpression(true);
throw new UnexpectedTokenException(this.lexer.NextToken());
}
if (this.TryParse(TokenType.Name, "function") || this.TryParse(TokenType.Name, "sub"))
return this.ParseFunctionExpression(false);
Token token = this.lexer.NextToken();
if (token == null)
return null;
switch (token.TokenType)
{
case TokenType.Separator:
if (token.Value == "(")
{
IExpression expr = this.ParseExpression();
this.Parse(TokenType.Separator, ")");
return expr;
}
break;
case TokenType.Boolean:
bool booleanValue = Convert.ToBoolean(token.Value);
return new ConstantExpression(booleanValue);
case TokenType.Integer:
int intValue = Int32.Parse(token.Value, System.Globalization.CultureInfo.InvariantCulture);
return new ConstantExpression(intValue);
case TokenType.Real:
double realValue = Double.Parse(token.Value, System.Globalization.CultureInfo.InvariantCulture);
return new ConstantExpression(realValue);
case TokenType.String:
IList<string> parts = StringUtilities.SplitText(token.Value);
if (parts.Count == 1)
return new ConstantExpression(token.Value);
IExpression strexpr = new ConstantExpression(parts[0]);
for (int k = 1; k < parts.Count; k++)
if ((k % 2) == 0)
strexpr = new ConcatenateExpression(strexpr, new ConstantExpression(parts[k]));
else
{
Parser parser = new Parser(parts[k]);
strexpr = new ConcatenateExpression(strexpr, parser.ParseExpression());
}
return strexpr;
case TokenType.Name:
if (this.TryParse(TokenType.Separator, "("))
{
List<IExpression> arguments = this.ParseArgumentList();
return new InvokeExpression(token.Value, arguments);
}
if (this.TryParse(TokenType.Operator, "..."))
{
this.lexer.NextToken();
return new VariableVariableExpression(token.Value);
}
return new VariableExpression(token.Value);
}
throw new UnexpectedTokenException(token);
}