private IExpression CompileQualifiedName(IExpressionNodeFactory factory, IExpression curContext, IList <ParseNode> identifiers, int startIndex)
{
if (startIndex >= identifiers.Count)
{
return(curContext);
}
int curIndex = startIndex;
ParseNode curNode = identifiers[curIndex].Nodes[0];
var nameParts = new List <string>();
while (curNode != null && curNode.Token.Type == TokenType.IDENTIFIER)
{
nameParts.Add(curNode.Token.Text);
curIndex += 1;
curNode = (curIndex < identifiers.Count) ? identifiers[curIndex].Nodes[0] : null;
}
if (curNode != null)
{
if (curNode.Token.Type == TokenType.Array)
{
nameParts.Add(curNode.Nodes[0].Token.Text);
IExpression arrayContext = new QualifiedName(curContext, nameParts.ToArray());
var arrayFunc = new ItemAtIndex();
IExpression index = CompileExpressionNode(factory, curNode.Nodes[2]);
arrayFunc.AcceptArguments(arrayContext, index);
return(CompileQualifiedName(factory, arrayFunc, identifiers, curIndex + 1));
}
if (curNode.Token.Type == TokenType.Method)
{
var methodContext = nameParts.Count > 0 ? new QualifiedName(curContext, nameParts.ToArray()) : curContext;
string methodName = curNode.Nodes[0].Token.Text;
IList <ParseNode> argNodes = Select(curNode.Nodes[2].Nodes, TokenType.BooleanExpr);
var args = new List <IExpression>();
if (methodContext != null)
{
args.Add(methodContext);
}
foreach (ParseNode argNode in argNodes)
{
args.Add(CompileExpressionNode(factory, argNode));
}
return(CompileQualifiedName(factory, factory.CreateFunction(methodName, args.ToArray()), identifiers, curIndex + 1));
}
}
if (curContext == null && nameParts.Count == 1)
{
return(factory.CreateVariable(nameParts[0]));
}
return(new QualifiedName(curContext, nameParts.ToArray()));
}
protected virtual IExpression CompileExpressionNode(IExpressionNodeFactory factory, ParseTreeNode astNode)
{
switch (astNode.Term.Name)
{
case "Number":
var num = TypeNormalizer.EnsureType <double>(astNode.Token.Value);
return(factory.CreateLiteral(num));
case "String":
var str = TypeNormalizer.EnsureType <string>(astNode.Token.Value);
return(factory.CreateLiteral(str));
case "Boolean":
var bln = TypeNormalizer.EnsureType <bool>(astNode.Token.Value);
return(factory.CreateLiteral(bln));
case "Identifier":
var variable = astNode.Token.Value;
if (variable != null)
{
return(factory.CreateVariable(variable.ToString()));
}
break;
case "Expr":
if (astNode.ChildNodes.Count == 3 &&
astNode.ChildNodes[1].Term is SymbolTerminal)
{
IExpression left = CompileExpressionNode(factory, astNode.ChildNodes[0]);
IExpression right = CompileExpressionNode(factory, astNode.ChildNodes[2]);
return(factory.CreateBinaryOperator(astNode.ChildNodes[1].Term.Name, left, right));
}
if (astNode.ChildNodes.Count == 2 &&
astNode.ChildNodes[0].Term is SymbolTerminal)
{
IExpression arg = CompileExpressionNode(factory, astNode.ChildNodes[1]);
return(factory.CreateUnaryOperator(astNode.ChildNodes[0].Term.Name, arg));
}
if (astNode.ChildNodes.Count == 2 &&
astNode.ChildNodes[1].Term is SymbolTerminal)
{
IExpression arg = CompileExpressionNode(factory, astNode.ChildNodes[0]);
return(factory.CreateUnaryOperator(astNode.ChildNodes[1].Term.Name, arg));
}
break;
case "QualifiedName":
var parts = new List <string>();
if (astNode.ChildNodes.Count == 2)
{
return(new QualifiedName(new[] { astNode.ChildNodes[1].Token.ValueString }));
}
//Condition ought to be impossible
if (astNode.ChildNodes.Count != 3)
{
throw new Exception("Malformed QualifiedName - should have 3 child nodes");
}
ExtractQualifiedName(astNode, parts);
return(new QualifiedName(parts.ToArray()));
case "FunctionExpression":
string functionName = (astNode.ChildNodes[0].Token.ValueString);
var args = new IExpression[astNode.ChildNodes[1].ChildNodes.Count];
for (int i = 0; i < astNode.ChildNodes[1].ChildNodes.Count; i++)
{
args[i] = CompileExpressionNode(factory, astNode.ChildNodes[1].ChildNodes[i]);
}
return(factory.CreateFunction(functionName, args));
case "IfThen":
IExpression condition = CompileExpressionNode(factory, astNode.ChildNodes[1]);
IExpression trueExpr = CompileExpressionNode(factory, astNode.ChildNodes[3]);
IExpression falseExpr = null;
if (astNode.ChildNodes.Count == 6)
{
falseExpr = CompileExpressionNode(factory, astNode.ChildNodes[5]);
}
var func = new IfThen();
if (falseExpr != null)
{
func.AcceptArguments(condition, trueExpr, falseExpr);
}
else
{
func.AcceptArguments(condition, trueExpr);
}
return(func);
case "ArrayExpression":
IExpression context = CompileExpressionNode(factory, astNode.ChildNodes[0]);
IExpression index = CompileExpressionNode(factory, astNode.ChildNodes[1]);
var indexer = new ItemAtIndex();
indexer.AcceptArguments(context, index);
return(indexer);
}
return(null);
}
