public List <string> GetAllVariables(string s)
{
var op = new DefaultOperators();
var set = new HashSet <string>();
foreach (var item in op.Operators)
{
s = s.Replace(item.Symbol, " ");
}
s = s.Replace('(', ' ').Replace(')', ' ');
var arr = s.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
foreach (var item in arr)
{
if (IsVariable(item))
{
set.Add(item);
}
}
var res = set.ToList();
res.Sort();
return(res);
}
/// <summary>
/// Default constructor, creates an ExpressionParser object
/// </summary>
public ExpressionParser()
{
// Cache for values and expressions
Values = new ValuesDictionary();
Expressions = new ExpressionDictionary();
// Add all valid operators.
var operators = new DefaultOperators();
IDictionary<string, Operator> ops = new Dictionary<string, Operator>();
foreach (var op in operators.Operators)
{
var symbol = op.Symbol;
if (symbol.Length > maxOpLength)
{
maxOpLength = symbol.Length;
}
ops.Add(symbol, op);
}
// Constants
IDictionary<string, double> spconst = new Dictionary<string, double>();
spconst.Add("euler", Math.E);
spconst.Add("pi", Math.PI);
spconst.Add("nan", Double.NaN);
spconst.Add("infinity", Double.PositiveInfinity);
spconst.Add("true", 1D);
spconst.Add("false", 0D);
treeParser = new TreeParser(ops, spconst);
treeParser.ImplicitMultiplication = true;
treeParser.RequireParentheses = true;
Culture = CultureInfo.InvariantCulture;
}