protected abstract bool ConsumeNestedQuery(string text, int startIndex, int endIndex, StringView sv, Match match, ICollection <QueryError> errors, TUserData userData);
int MatchNestedQuery(string text, int startIndex, int endIndex, ICollection <QueryError> errors, out StringView sv, out Match match, out bool matched)
{
sv = text.GetStringView();
match = QueryRegexValues.k_NestedQueryRx.Match(text, startIndex, endIndex - startIndex);
if (!match.Success)
{
matched = false;
return(-1);
}
matched = true;
return(match.Length);
}
int MatchGroup(string text, int groupStartIndex, int endIndex, ICollection <QueryError> errors, out StringView sv, out Match match, out bool matched)
{
sv = text.GetStringView();
match = null;
if (groupStartIndex >= text.Length || text[groupStartIndex] != '(')
{
matched = false;
return(-1);
}
matched = true;
if (groupStartIndex < 0 || groupStartIndex >= text.Length)
{
errors.Add(new QueryError {
index = 0, reason = $"A group should have been found but index was {groupStartIndex}"
});
return(-1);
}
var charConsumed = 0;
var parenthesisCounter = 1;
var groupEndIndex = groupStartIndex + 1;
for (; groupEndIndex < text.Length && parenthesisCounter > 0; ++groupEndIndex)
{
if (text[groupEndIndex] == '(')
{
++parenthesisCounter;
}
else if (text[groupEndIndex] == ')')
{
--parenthesisCounter;
}
}
// Because of the final ++groupEndIndex, decrement the index
--groupEndIndex;
if (parenthesisCounter != 0)
{
errors.Add(new QueryError {
index = groupStartIndex, reason = $"Unbalanced parenthesis"
});
return(-1);
}
charConsumed = groupEndIndex - groupStartIndex + 1;
sv = text.GetStringView(groupStartIndex + 1, groupStartIndex + charConsumed - 1);
return(charConsumed);
}
static int MatchCombiningToken(string text, int startIndex, int endIndex, ICollection <QueryError> errors, out StringView sv, out Match match, out bool matched)
{
match = null;
sv = text.GetStringView();
var totalUsableLength = endIndex - startIndex;
foreach (var combiningToken in k_CombiningToken)
{
var tokenLength = combiningToken.Length;
if (tokenLength > totalUsableLength)
{
continue;
}
sv = text.GetWordView(startIndex);
if (sv == combiningToken)
{
matched = true;
return(sv.Length);
}
}
matched = false;
return(-1);
}
static int MatchEmpty(string text, int startIndex, int endIndex, ICollection <QueryError> errors, out StringView sv, out Match match, out bool matched)
{
var currentIndex = startIndex;
var lengthMatched = 0;
matched = false;
while (currentIndex < endIndex && QueryEngineUtils.IsWhiteSpaceChar(text[currentIndex]))
{
++currentIndex;
++lengthMatched;
matched = true;
}
sv = text.GetStringView(startIndex, startIndex + lengthMatched);
match = null;
return(lengthMatched);
}
int MatchWord(string text, int startIndex, int endIndex, ICollection <QueryError> errors, out StringView sv, out Match match, out bool matched)
{
sv = text.GetStringView();
match = k_PhraseRx.Match(text, startIndex, endIndex - startIndex);
if (!match.Success)
{
match = k_WordRx.Match(text, startIndex, endIndex - startIndex);
}
if (!match.Success)
{
matched = false;
return(-1);
}
matched = true;
return(match.Length);
}