/// <summary>
/// Provides the Term at position Index of the Buffer.
/// </summary>
/// <param name="root">The root element for which this term is built</param>
/// <returns></returns>
private Statement.Statement Statement(ModelElement root)
{
Statement.Statement retVal = null;
Root = root;
if (LookAhead("APPLY"))
{
Match("APPLY");
Call callExpression = Expression(0) as Call;
if (callExpression != null)
{
Statement.ProcedureCallStatement call = new Statement.ProcedureCallStatement(root, callExpression);
Match("ON");
Expression listExpression = Expression(0);
Expression condition = null;
if (LookAhead("|"))
{
Match("|");
condition = Expression(0);
}
retVal = new Statement.ApplyStatement(root, call, listExpression, condition);
}
else
{
Root.AddError("Cannot parse call expression");
}
}
else if (LookAhead("INSERT"))
{
Match("INSERT");
Expression value = Expression(0);
if (value != null)
{
Match("IN");
Expression list = Expression(0);
Expression replaceElement = null;
if (LookAhead("WHEN"))
{
Match("WHEN");
Match("FULL");
Match("REPLACE");
replaceElement = Expression(0);
}
retVal = new Statement.InsertStatement(root, value, list, replaceElement);
}
}
else if (LookAhead("REMOVE"))
{
Match("REMOVE");
Statement.RemoveStatement.PositionEnum position = Interpreter.Statement.RemoveStatement.PositionEnum.First;
if (LookAhead("FIRST"))
{
Match("FIRST");
}
else if (LookAhead("LAST"))
{
Match("LAST");
position = Interpreter.Statement.RemoveStatement.PositionEnum.Last;
}
else if (LookAhead("ALL"))
{
Match("ALL");
position = Interpreter.Statement.RemoveStatement.PositionEnum.All;
}
Expression condition = null;
if (!LookAhead("IN"))
{
condition = Expression(0);
}
Match("IN");
Expression list = Expression(0);
retVal = new Statement.RemoveStatement(root, condition, position, list);
}
else if (LookAhead("REPLACE"))
{
Match("REPLACE");
Expression condition = Expression(0);
Match("IN");
Expression list = Expression(0);
Match("BY");
Expression value = Expression(0);
retVal = new Statement.ReplaceStatement(root, value, list, condition);
}
else
{
Expression expression = Expression(0);
if (expression != null)
{
if (LookAhead("<-"))
{
// This is a variable update
Match("<-");
if (LookAhead("%"))
{
Match("%");
}
Expression expression2 = Expression(0);
if (expression2 != null)
{
retVal = new Statement.VariableUpdateStatement(root, expression, expression2);
}
else
{
Root.AddError("Invalid <- right side");
}
expression.Enclosing = retVal;
}
else
{
// This is a procedure call
Call call = expression as Call;
if (call != null)
{
retVal = new Statement.ProcedureCallStatement(root, call);
}
else
{
Root.AddError("Cannot parse call expression");
}
}
}
else
{
Root.AddError("Cannot parse expression");
}
}
return(retVal);
}
/// <summary>
/// Parses a statement
/// </summary>
/// <returns></returns>
private Statement.Statement InnerParseStatement()
{
Statement.Statement retVal = null;
int start = Index;
if (LookAhead("APPLY"))
{
Match("APPLY");
Statement.Statement appliedStatement = InnerParseStatement();
if (appliedStatement != null)
{
Match("ON");
Expression listExpression = Expression(0);
Expression condition = null;
if (LookAhead("|"))
{
Match("|");
condition = Expression(0);
}
retVal = new ApplyStatement(Root, RootLog, appliedStatement, listExpression, condition, start, Index);
}
else
{
RootLog.AddError("Cannot parse call expression");
}
}
else if (LookAhead("INSERT"))
{
Match("INSERT");
Expression value = Expression(0);
if (value != null)
{
Match("IN");
Expression list = Expression(0);
Expression replaceElement = null;
if (LookAhead("WHEN"))
{
Match("WHEN");
Match("FULL");
Match("REPLACE");
replaceElement = Expression(0);
}
retVal = new InsertStatement(Root, RootLog, value, list, replaceElement, start, Index);
}
}
else if (LookAhead("REMOVE"))
{
Match("REMOVE");
RemoveStatement.PositionEnum position = RemoveStatement.PositionEnum.First;
if (LookAhead("FIRST"))
{
Match("FIRST");
}
else if (LookAhead("LAST"))
{
Match("LAST");
position = RemoveStatement.PositionEnum.Last;
}
else if (LookAhead("ALL"))
{
Match("ALL");
position = RemoveStatement.PositionEnum.All;
}
Expression condition = null;
if (!LookAhead("IN"))
{
condition = Expression(0);
}
Match("IN");
Expression list = Expression(0);
retVal = new RemoveStatement(Root, RootLog, condition, position, list, start, Index);
}
else if (LookAhead("REPLACE"))
{
Match("REPLACE");
Expression condition = Expression(0);
Match("IN");
Expression list = Expression(0);
Match("BY");
Expression value = Expression(0);
retVal = new ReplaceStatement(Root, RootLog, value, list, condition, start, Index);
}
else
{
Expression expression = Expression(0);
if (expression != null)
{
string assignOp = LookAhead(AssignOps);
if (assignOp != null)
{
// This is a variable update
Match(assignOp);
if (LookAhead("%"))
{
Match("%");
}
Expression expression2 = Expression(0);
if (expression2 != null)
{
retVal = new VariableUpdateStatement(Root, RootLog, expression, expression2, start, Index);
}
else
{
RootLog.AddError("Invalid <- right side");
}
expression.Enclosing = retVal;
}
else
{
// This is a procedure call
Call call = expression as Call;
if (call != null)
{
retVal = new ProcedureCallStatement(Root, RootLog, call, start, Index);
}
}
}
}
return retVal;
}
/// <summary>
/// Visits a REPLACE statement
/// </summary>
/// <param name="replaceStatement"></param>
protected virtual void VisitReplaceStatement(ReplaceStatement replaceStatement)
{
if (replaceStatement.Value != null)
{
VisitExpression(replaceStatement.Value);
}
if (replaceStatement.ListExpression != null)
{
VisitExpression(replaceStatement.ListExpression);
}
if (replaceStatement.Condition != null)
{
VisitExpression(replaceStatement.Condition);
}
}
/// <summary>
/// Provides the Term at position Index of the Buffer.
/// </summary>
/// <param name="root">The root element for which this term is built</param>
/// <returns></returns>
private Statement.Statement Statement(ModelElement root)
{
Statement.Statement retVal = null;
Root = root;
if (LookAhead("APPLY"))
{
Match("APPLY");
Call callExpression = Expression(0) as Call;
if (callExpression != null)
{
Statement.ProcedureCallStatement call = new Statement.ProcedureCallStatement(root, callExpression);
Match("ON");
Expression listExpression = Expression(0);
Expression condition = null;
if (LookAhead("|"))
{
Match("|");
condition = Expression(0);
}
retVal = new Statement.ApplyStatement(root, call, listExpression, condition);
}
else
{
Root.AddError("Cannot parse call expression");
}
}
else if (LookAhead("INSERT"))
{
Match("INSERT");
Expression value = Expression(0);
if (value != null)
{
Match("IN");
Expression list = Expression(0);
Expression replaceElement = null;
if (LookAhead("WHEN"))
{
Match("WHEN");
Match("FULL");
Match("REPLACE");
replaceElement = Expression(0);
}
retVal = new Statement.InsertStatement(root, value, list, replaceElement);
}
}
else if (LookAhead("REMOVE"))
{
Match("REMOVE");
Statement.RemoveStatement.PositionEnum position = Interpreter.Statement.RemoveStatement.PositionEnum.First;
if (LookAhead("FIRST"))
{
Match("FIRST");
}
else if (LookAhead("LAST"))
{
Match("LAST");
position = Interpreter.Statement.RemoveStatement.PositionEnum.Last;
}
else if (LookAhead("ALL"))
{
Match("ALL");
position = Interpreter.Statement.RemoveStatement.PositionEnum.All;
}
Expression condition = null;
if (!LookAhead("IN"))
{
condition = Expression(0);
}
Match("IN");
Expression list = Expression(0);
retVal = new Statement.RemoveStatement(root, condition, position, list);
}
else if (LookAhead("REPLACE"))
{
Match("REPLACE");
Expression condition = Expression(0);
Match("IN");
Expression list = Expression(0);
Match("BY");
Expression value = Expression(0);
retVal = new Statement.ReplaceStatement(root, value, list, condition);
}
else
{
Expression expression = Expression(0);
if (expression != null)
{
if (LookAhead("<-"))
{
// This is a variable update
Match("<-");
if (LookAhead("%"))
{
Match("%");
}
Expression expression2 = Expression(0);
if (expression2 != null)
{
retVal = new Statement.VariableUpdateStatement(root, expression, expression2);
}
else
{
Root.AddError("Invalid <- right side");
}
expression.Enclosing = retVal;
}
else
{
// This is a procedure call
Call call = expression as Call;
if (call != null)
{
retVal = new Statement.ProcedureCallStatement(root, call);
}
else
{
Root.AddError("Cannot parse call expression");
}
}
}
else
{
Root.AddError("Cannot parse expression");
}
}
return retVal;
}