private void CreateStatement(ParseTreeNode statementNode, Event evt, CompositeStatement compositeStatement = null)
{
AbstractStatement statement = null;
if (statementNode.Term == grammar.Action)
{
statement = createAction(statementNode);
}
else if (statementNode.Term == grammar.Condition)
{
ConditionGroup conditionGroup = new ConditionGroup();
conditionGroup.If.Expression = getStrVal(statementNode.ChildNodes.First(child => child.Term == grammar.Expr));
foreach (ParseTreeNode child in grammar.GetOfType(statementNode, grammar.Actions)) CreateStatement(child, evt, conditionGroup.If);
foreach (ParseTreeNode elseNode in grammar.GetOfType(statementNode, grammar.Else))
{
string expr = getStrVal(elseNode.ChildNodes.FirstOrDefault(child => child.Term == grammar.Expr));
AbstractCondition cond;
if (null == expr)
{
conditionGroup.Else = new BasicCondition();
cond = conditionGroup.Else;
}
else
{
cond = new ExpressionCondition() { Expression = expr };
conditionGroup.AddStatement(cond);
}
foreach (ParseTreeNode child in grammar.GetOfType(elseNode, grammar.Actions)) CreateStatement(child, evt, cond);
}
statement = conditionGroup;
}
else if (statementNode.Term == grammar.Assignment)
{
Assignment assignment = new Assignment();
assignment.Key = getStrVal(statementNode.ChildNodes[0]);
assignment.Value = getStrVal(statementNode.ChildNodes.Last());
assignment.Operator = statementNode.ChildNodes.Count == 2 ? AssignmentOperator.Assign :
AbstractAssignment.AssignmentValues[grammar.OpLookup[statementNode.ChildNodes[1].Term]];
statement = assignment;
}
else
{
CompositeStatement loop = null;
switch (statementNode.ChildNodes.Count)
{
case 2:
WhileLoop wl = new WhileLoop();
wl.Expression = getStrVal(statementNode.ChildNodes[0]);
statement = loop = wl;
break;
case 3:
ForLoop fl = new ForLoop();
fl.Expression = getStrVal(statementNode.ChildNodes[0]);
//First assignment, expression, assignment, actions
fl.PostExpression = getStrVal(statementNode.ChildNodes[1]);
statement = loop = fl;
break;
case 4:
ForLoop forLoop = new ForLoop();
forLoop.Expression = getStrVal(statementNode.ChildNodes[1]);
//First assignment, expression, assignment, actions
forLoop.PostExpression = getStrVal(statementNode.ChildNodes[2]);
forLoop.PreExpression = getStrVal(statementNode.ChildNodes[0]);
statement = loop = forLoop;
break;
}
foreach (ParseTreeNode child in grammar.GetOfType(statementNode, grammar.Actions))
{
// TODO: This is a hack to skip the Actions found in the first line of the for() statement.
if (!statementNode.ChildNodes.Contains(child))
{
CreateStatement(child, evt, loop);
}
}
}
if (compositeStatement == null) evt.AddStatement(statement);
else compositeStatement.AddStatement(statement);
}
