public ISymbolicExpressionTree Parse(string str)
{
ISymbolicExpressionTreeNode root = programRootSymbol.CreateTreeNode();
ISymbolicExpressionTreeNode start = startSymbol.CreateTreeNode();
var allTokens = GetAllTokens(str).ToArray();
ISymbolicExpressionTreeNode mainBranch = ParseS(new Queue <Token>(allTokens));
// only a main branch was given => insert the main branch into the default tree template
root.AddSubtree(start);
start.AddSubtree(mainBranch);
return(new SymbolicExpressionTree(root));
}
/// <summary>
/// Transforms the tree model to a symbolic regression model
/// </summary>
/// <returns>A new symbolic regression model which matches the tree model</returns>
public SymbolicRegressionModel CreateSymbolicRegressionModel()
{
var rootSy = new ProgramRootSymbol();
var startSy = new StartSymbol();
var varCondSy = new VariableCondition()
{
IgnoreSlope = true
};
var constSy = new Constant();
var startNode = startSy.CreateTreeNode();
startNode.AddSubtree(CreateSymbolicRegressionTreeRecursive(tree, 0, varCondSy, constSy));
var rootNode = rootSy.CreateTreeNode();
rootNode.AddSubtree(startNode);
return(new SymbolicRegressionModel(TargetVariable, new SymbolicExpressionTree(rootNode), new SymbolicDataAnalysisExpressionTreeLinearInterpreter()));
}
public ISymbolicExpressionTree Import(string str)
{
str = str.Replace("(", " ( ").Replace(")", " ) ");
ISymbolicExpressionTreeNode root = programRootSymbol.CreateTreeNode();
ISymbolicExpressionTreeNode start = startSymbol.CreateTreeNode();
ISymbolicExpressionTreeNode mainBranch = ParseSexp(new Queue <Token>(GetTokenStream(str)));
if (mainBranch.Symbol is ProgramRootSymbol)
{
// when a root symbol was parsed => use main branch as root
root = mainBranch;
}
else
{
// only a main branch was given => insert the main branch into the default tree template
root.AddSubtree(start);
start.AddSubtree(mainBranch);
}
return(new SymbolicExpressionTree(root));
}