public void ValidExpressionContainsNoUnrecognizedTokens()
{
TheLexer lexer = new TheLexer();
var tokens = lexer.GetTokens("3 + 5");
Assert.AreEqual(0, tokens.Count(p => p.GetType() == typeof (UnrecognizedToken)));
}
public void UnrecognizedTokenDetected()
{
TheLexer lexer = new TheLexer();
var tokens = lexer.GetTokens("3 xyz 5");
Assert.AreEqual(1, tokens.Count(p => p.GetType() == typeof(UnrecognizedToken)));
}
/// <summary>
/// Evaluates the expression
/// </summary>
public decimal Evaluate()
{
Lexer.TheLexer lexer = new Lexer.TheLexer();
var tokens = lexer.GetTokens(_expression).ToList();
Parser parser = new Parser(new OperationOrder());
ExpressionTree expressionTree = parser.Parse(tokens);
return expressionTree.Walk();
}
/// <summary>
/// Evaluates the expression
/// </summary>
public decimal Evaluate()
{
Lexer.TheLexer lexer = new Lexer.TheLexer();
var tokens = lexer.GetTokens(_expression).ToList();
Parser parser = new Parser(new OperationOrder());
ExpressionTree expressionTree = parser.Parse(tokens);
return(expressionTree.Walk());
}