private bool Match()
{
// Named Group Match will not set groups not found
Group sym = null;
int symIndex = 0;
int symLength = 0;
Group opc = null;
int opcIndex = 0;
int opcLength = 0;
Group drc = null;
int drcIndex = 0;
int drcLength = 0;
Symbol = string.Empty;
OpCode = string.Empty;
Directive = string.Empty;
//evaluate results of Regex and for each match
var matches = CompiledRegex.Matches(Code);
foreach (Match m in matches)
{
//loop through all the groups in current match
for (int x = 1; x < m.Groups.Count; x++)
{
//print the names wherever there is a succesful match
if (m.Groups[x].Success)
{
var group = m.Groups[x];
var groupName = CompiledRegex.GroupNameFromNumber(x);
switch (groupName)
{
case "sym":
sym = group;
symIndex = group.Index;
symLength = group.Length;
Symbol = group.Value;
break;
case "op":
opc = group;
opcIndex = group.Index;
opcLength = group.Length;
OpCode = group.Value;
break;
case "dr":
drc = group;
drcIndex = group.Index;
drcLength = group.Length;
Directive = group.Value;
break;
}
}
}
}
// This is a hack. Probably need to master conditional
// RegEx so when we match an opcode, we don't try to match
// any directive. The basic problem is that a directive
// name could also be the operand of a opcode, as in:
// STA PAGE
// Worse, in a case like PAGE, the code wants to skip
// the entire line.
if (OpCode.Length > 0)
{
Directive = string.Empty;
drcIndex = 0;
drcLength = 0;
}
if (sym != null || drc != null || opc != null)
{
// Find beginning of operand
var startOfOperand = opcIndex + opcLength;
var otherEnd = drcIndex + drcLength;
if (otherEnd > startOfOperand)
{
startOfOperand = otherEnd;
}
otherEnd = symIndex + symLength;
if (otherEnd > startOfOperand)
{
startOfOperand = otherEnd;
}
Operand = Code.Substring(startOfOperand);
return(true);
}
return(false);
}
