public static bool IsWrapped(this String text, IEnumerable <String> openBrackets, IEnumerable <String> closeBrackets, out String openingBracket, out String closingBracket)
{
if (text.Length < 2)
{
openingBracket = null;
closingBracket = null;
return(false);
}
int stage = 1;
openingBracket = null;
closingBracket = null;
HashSet <string> openSet = openBrackets.ToHashSet();
int depth = 0;
SymbolFinder finder = new SymbolFinder(openBrackets.Union(closeBrackets));
string symb = "";
int text_lastIndex = text.Length - 1;
char c;
char?next;
for (int i = 0; i < text.Length; i++)
{
c = text[i];
next = i == text_lastIndex ? null : (char?)text[i + 1];
symb = finder.Find(c, next);
if (stage == 1)
{
if (openSet.Contains(symb))
{
if (symb.Length - 1 != i)
{
return(false);
}
// what this block does:
// - sets openingBracket and closingBracket to their apropriate values.
// - increments stage to 2
// - increments depth
// get index of openBracket and set openingBracket
int index = 0;
foreach (String bracket in openBrackets)
{
if (bracket == symb)
{
openingBracket = bracket;
break;
}
index++;
}
//
// set closing bracket
try
{
closingBracket = closeBrackets.ElementAt(index);
}
catch (ArgumentOutOfRangeException e)
{
throw new BracketDisparityException();
}
depth++;
stage = 2;
}
}
else
{
if (openingBracket == symb)
{
depth++;
}
if (closingBracket == symb)
{
depth--;
}
if (i == text_lastIndex)
{
return(depth == 0);
}
else if (depth == 0)
{
openingBracket = "";
closingBracket = "";
return(false);
}
}
}
openingBracket = "";
closingBracket = "";
return(false);
}
