public string Read(string line) // decode a set of multi conditions (<cond> Or <cond>) Outer (<cond> And <cond>) etc
{
StringParser sp = new StringParser(line);
bool multi = false;
string delimchars = " ";
if (sp.IsCharMoveOn('('))
{
multi = true;
delimchars = ") ";
}
List <Condition> cllist = new List <Condition>();
ConditionEntry.LogicalCondition outercond = ConditionEntry.LogicalCondition.Or; // first outer condition is ignored in a list. Or is the default.
while (true)
{
Condition c = new Condition();
string err = c.Read(sp, delimchars: delimchars);
if (err.Length > 0)
{
return(err);
}
c.outercondition = outercond;
cllist.Add(c); // add..
if (sp.IsCharMoveOn(')')) // if closing bracket..
{
if (!multi)
{
return("Closing condition bracket found but no opening bracket present");
}
if (sp.IsEOL) // EOL, end of (cond..cond) outercond ( cond cond)
{
conditionlist = cllist;
return(null);
}
else
{
err = ConditionEntry.GetLogicalCondition(sp, delimchars, out outercond);
if (err.Length > 0)
{
return(err + " for outer condition");
}
if (!sp.IsCharMoveOn('(')) // must have another (
{
return("Missing opening bracket in multiple condition list after " + outercond.ToString());
}
}
}
else if (sp.IsEOL) // last condition
{
if (multi)
{
return("Missing closing braket in multiple condition list");
}
conditionlist = cllist;
return(null);
}
else
{
return("Extra characters beyond expression");
}
}
}
public string Read(BaseUtils.StringParser sp, bool includeevent = false, string delimchars = " ") // if includeevent is set, it must be there..
{ // demlimchars is normally space, but can be ") " if its inside a multi.
fields = new List <ConditionEntry>();
innercondition = outercondition = ConditionEntry.LogicalCondition.Or;
eventname = ""; action = ""; actiondata = "";
if (includeevent)
{
if ((eventname = sp.NextQuotedWord(", ")) == null || !sp.IsCharMoveOn(',') ||
(action = sp.NextQuotedWord(", ")) == null || !sp.IsCharMoveOn(',') ||
(actiondata = sp.NextQuotedWord(", ")) == null || !sp.IsCharMoveOn(','))
{
return("Incorrect format of EVENT data associated with condition");
}
}
ConditionEntry.LogicalCondition?ic = null;
while (true)
{
string var = sp.NextQuotedWord(delimchars); // always has para cond
if (var == null)
{
return("Missing parameter (left side) of condition");
}
string cond = sp.NextQuotedWord(delimchars);
if (cond == null)
{
return("Missing condition operator");
}
ConditionEntry.MatchType mt;
if (!ConditionEntry.MatchTypeFromString(cond, out mt))
{
return("Condition operator " + cond + " is not recognised");
}
string value = "";
if (ConditionEntry.IsNullOperation(mt)) // null operators (Always..)
{
if (!var.Equals("Condition", StringComparison.InvariantCultureIgnoreCase))
{
return("Condition must preceed fixed result operator");
}
var = "Condition"; // fix case..
}
else if (!ConditionEntry.IsUnaryOperation(mt)) // not unary, require right side
{
value = sp.NextQuotedWord(delimchars);
if (value == null)
{
return("Missing value part (right side) of condition");
}
}
ConditionEntry ce = new ConditionEntry()
{
itemname = var, matchtype = mt, matchstring = value
};
fields.Add(ce);
if (sp.IsEOL || sp.PeekChar() == ')') // end is either ) or EOL
{
innercondition = (ic == null) ? ConditionEntry.LogicalCondition.Or : ic.Value;
return("");
}
else
{
ConditionEntry.LogicalCondition nic;
string err = ConditionEntry.GetLogicalCondition(sp, delimchars, out nic);
if (err.Length > 0)
{
return(err + " for inner condition");
}
if (ic == null)
{
ic = nic;
}
else if (ic.Value != nic)
{
return("Cannot specify different inner conditions between expressions");
}
}
}
}