private void BuildTokens()
{
_tokens = new List <IToken>();
foreach (var t in _postFunction.Tokens)
{
if (IsVariable(t))
{
if (!_variables.ContainsKey(t))
{
GenericVariable <object> v;
v = new GenericVariable <object>(t, null);
_variables.Add(t, v);
_tokens.Add(v);
}
else
{
var v = _variables[t];
_tokens.Add(v);
}
continue;
}
if (ExpressionKeywords.Keywords.Count(x => x.Name == t) == 1)
{
var v = ExpressionKeywords.Keywords.Single(x => x.Name == t);
_tokens.Add(v);
}
if (IsNumber(t))
{
var v = (GenericOperand <decimal>)ConvertToOperand(t);
_tokens.Add(v);
}
if (IsString(t))
{
var v = (GenericOperand <string>)ConvertToOperand(t);
_tokens.Add(v);
}
if (IsConstant(t))
{
var v = ExpressionKeywords.Constants[t];
_tokens.Add(v);
}
}
}
private string replaceStrings(string expression)
{
foreach (var op in ExpressionKeywords.StringGroupOperators)
{
if (expression.Count(s => s == op[0]) % 2 != 0)
{
throw new ExpressionException("String grouping error! \"" + op + "\" use incorrectly.");
}
var pattern = string.Format("{0}.*?{0}", op);
var regex = new Regex(pattern);
expression = regex.Replace(expression, m =>
{
var name = Guid.NewGuid().ToString("N");
var value = m.Value.Substring(1, m.Value.Length - 2).ToLower();
var newVar = new GenericVariable <string>(name, value);
AutoVariables.Add(name, newVar);
return(" " + name + " ");
});
}
return(expression);
}
