//------------------------------------------------------------
// ???
//public static int Balance(this StringView str, int indexOfOpeningBracketOrQuote) {
// var literalStatus = new LiteralStatus();
// for (int i = indexOfOpeningBracketOrQuote; i != str.Length; ++i) {
// if (str[i].IsBracket()) {
// literalStatus.PushBracket(str[i].GetBracketType());
// if (literalStatus.Effective) {
// return i + 1;
// }
// }
// else if (str[i].IsQuote()) {
// literalStatus.PushQuote(str[i].GetQuoteType());
// if (literalStatus.Effective) {
// return i + 1;
// }
// }
// }
// return str.Length;
//}
//============================================================
public static StringView StripBoundaryWhitespaces(this StringView str)
{
int p = str.GetFirstSpaceBoundary();
int n = str.GetLastSpaceBoundary();
return(str.GetSubView(p, n));
}
//============================================================
public static IEnumerable <StringView> GetWords(this StringView str, Predicate <char> whitespacePred)
{
int p = str.GetFirstSpaceBoundary();
int n = str.GetLastSpaceBoundary();
// if all are whitespaces
if (p > n)
{
yield break;
}
for (int i = p; i != n; ++i)
{
if (str[i] == ' ')
{
yield return(str.GetSubView(p, i));
p = i = str.FindFirst((char c) => c != ' ', i);
}
}
yield return(str.GetSubView(p, n));
}
// delimitiers: ' " ( [ { ) ] } space
// two continuous splitter can form a word boundary without presence of space
// result of Bracketed or Quoted may not balanced or matched
public static IEnumerable <(BalancedTermType termType, StringView termStr)> EachTerm(this StringView str)
{
int n = str.Length;
int p, i;
i = p = str.NextNonSpace(0);
while (i != n)
{
char c = str[i];
if (c == ' ')
{
yield return(BalancedTermType.Spaced, str.GetSubView(p, i));
i = p = str.NextNonSpace(i);
}
else if (c.IsOpeningBracket())
{
if (p != i)
{
yield return(BalancedTermType.Spaced, str.GetSubView(p, i));
p = i;
}
if ((i = str.BalanceBracket(i)) == str.Length)
{
throw new Exception("bracket are not balanced");
}
yield return(BalancedTermType.Bracketed, str.GetSubView(p, i + 1));
i = p = str.NextNonSpace(i + 1);
}
else if (c.IsQuote())
{
if (p != i)
{
yield return(BalancedTermType.Spaced, str.GetSubView(p, i));
p = i;
}
if ((i = str.BalanceQuote(i)) == str.Length)
{
throw new Exception("quote are not balanced");
}
yield return(BalancedTermType.Quoted, str.GetSubView(p, i + 1));
i = p = str.NextNonSpace(i + 1);
}
else
{
++i;
}
}
if (i != p)
{
yield return(BalancedTermType.Spaced, str.GetSubView(p, i));
}
}
public static StringView WithoutOutermostSpaces(this StringView str)
{
return(str.GetSubView(str.GetFirstSpaceBoundary(), str.GetLastSpaceBoundary()));
}
