private Token FindNestedToken(int offset, IList<Token> tokens, FindTokenMode mode)
{
Token token = null;
bool foundNestedToken = false;
int i;
for (i = tokens.Count - 1; i >= 0; i--)
{
if (OffsetWithinToken(offset, tokens[i]))
{
token = tokens[i];
var strToken = token as StringExpandableToken;
if (strToken != null && strToken.NestedTokens != null)
{
var nestedToken = FindNestedToken(offset, strToken.NestedTokens, mode);
if (nestedToken != null)
{
token = nestedToken;
foundNestedToken = true;
}
}
break;
}
if (offset >= tokens[i].Extent.EndOffset)
{
break;
}
}
switch (mode)
{
case FindTokenMode.CurrentOrNext:
if (token == null && (i + 1) < tokens.Count)
{
token = tokens[i + 1];
}
break;
case FindTokenMode.Next:
if (!foundNestedToken)
{
// If there is no next token, return null (happens with nested
// tokens where there is no EOF/EOS token).
token = ((i + 1) < tokens.Count) ? tokens[i + 1] : null;
}
break;
case FindTokenMode.Previous:
if (token == null)
{
if (i >= 0)
{
token = tokens[i];
}
}
else if (offset == token.Extent.StartOffset)
{
token = i > 0 ? tokens[i - 1] : null;
}
break;
}
return token;
}
private Token FindToken(int current, FindTokenMode mode)
{
MaybeParseInput();
return(FindNestedToken(current, _tokens, mode));
}
private Token FindToken(int current, FindTokenMode mode)
{
MaybeParseInput();
return FindNestedToken(current, _tokens, mode);
}
private Token FindNestedToken(int offset, IList <Token> tokens, FindTokenMode mode)
{
Token token = null;
bool foundNestedToken = false;
int i;
for (i = tokens.Count - 1; i >= 0; i--)
{
if (OffsetWithinToken(offset, tokens[i]))
{
token = tokens[i];
if (token is StringExpandableToken strToken && strToken.NestedTokens != null)
{
var nestedToken = FindNestedToken(offset, strToken.NestedTokens, mode);
if (nestedToken != null)
{
token = nestedToken;
foundNestedToken = true;
}
}
break;
}
if (offset >= tokens[i].Extent.EndOffset)
{
break;
}
}
switch (mode)
{
case FindTokenMode.CurrentOrNext:
if (token == null && (i + 1) < tokens.Count)
{
token = tokens[i + 1];
}
break;
case FindTokenMode.Next:
if (!foundNestedToken)
{
// If there is no next token, return null (happens with nested
// tokens where there is no EOF/EOS token).
token = ((i + 1) < tokens.Count) ? tokens[i + 1] : null;
}
break;
case FindTokenMode.Previous:
if (token == null)
{
if (i >= 0)
{
token = tokens[i];
}
}
else if (offset == token.Extent.StartOffset)
{
token = i > 0 ? tokens[i - 1] : null;
}
break;
}
return(token);
}
