// Due to the way generics are implemented, repeating the implementation
// of this base-class method might improve performance (TODO: verify this idea)
new protected int LA(int i)
{
bool fail;
char result = CharSource.TryGet(InputPosition + i, out fail);
return(fail ? -1 : result);
}
string ParseStringCore(int start)
{
Debug.Assert(_verbatim == (CharSource[start] == '@'));
if (_verbatim)
{
start++;
}
char q;
Debug.Assert((q = CharSource.TryGet(start, '\0')) == '"' || q == '\'' || q == '`');
bool tripleQuoted = (_style & NodeStyle.BaseStyleMask) == NodeStyle.TDQStringLiteral ||
(_style & NodeStyle.BaseStyleMask) == NodeStyle.TQStringLiteral;
string value;
if (!_parseNeeded)
{
Debug.Assert(!tripleQuoted);
value = (string)CharSource.Slice(start + 1, InputPosition - start - 2).ToString();
}
else
{
UString original = CharSource.Slice(start, InputPosition - start);
value = UnescapeQuotedString(ref original, _verbatim, Error, _indent);
}
return(value);
}
protected string ParseStringValue(bool parseNeeded, bool isTripleQuoted)
{
if (SkipValueParsing)
{
return(null);
}
string value;
if (parseNeeded)
{
UString original = CharSource.Slice(_startPosition, InputPosition - _startPosition);
value = Les2Lexer.UnescapeQuotedString(ref original, Error, IndentString, true);
Debug.Assert(original.IsEmpty);
}
else
{
Debug.Assert(CharSource.TryGet(InputPosition - 1, '?') == CharSource.TryGet(_startPosition, '!'));
if (isTripleQuoted)
{
value = CharSource.Slice(_startPosition + 3, InputPosition - _startPosition - 6).ToString();
}
else
{
value = CharSource.Slice(_startPosition + 1, InputPosition - _startPosition - 2).ToString();
}
}
return(value);
}
string ParseStringCore(bool isTripleQuoted)
{
if (SkipValueParsing)
{
return("");
}
string value;
if (_parseNeeded)
{
UString original = CharSource.Slice(_startPosition, InputPosition - _startPosition);
value = UnescapeQuotedString(ref original, Error, _indent);
Debug.Assert(original.IsEmpty);
}
else
{
Debug.Assert(CharSource.TryGet(InputPosition - 1, '?') == CharSource.TryGet(_startPosition, '!'));
if (isTripleQuoted)
{
value = CharSource.Slice(_startPosition + 3, InputPosition - _startPosition - 6).ToString();
}
else
{
value = CharSource.Slice(_startPosition + 1, InputPosition - _startPosition - 2).ToString();
}
}
return(value);
}
Symbol ParseIdOrSymbol(int start, bool isBQString)
{
UString unparsed = CharSource.Slice(start, InputPosition - start);
UString parsed;
Debug.Assert(isBQString == (CharSource.TryGet(start, '\0') == '`'));
Debug.Assert(!_verbatim);
if (_idCache.TryGetValue(unparsed, out Symbol value))
{
return(value);
}
else
{
if (isBQString)
{
parsed = UnescapeQuotedString(start);
}
else if (_parseNeeded)
{
parsed = ScanNormalIdentifier(unparsed);
}
else
{
parsed = unparsed;
}
return(_idCache[unparsed.ShedExcessMemory(50)] = (Symbol)parsed);
}
}
protected UString UnescapeString(bool isTripleQuoted, bool allowExtraIndent = false)
{
if (SkipValueParsing)
{
return("");
}
if (_hasEscapes)
{
UString original = CharSource.Slice(_startPosition, InputPosition - _startPosition);
_textValue = Les3Lexer.UnescapeQuotedString(ref original, Error, IndentString, allowExtraIndent);
Debug.Assert(original.IsEmpty);
}
else
{
Debug.Assert(CharSource.TryGet(InputPosition - 1, '?') == CharSource.TryGet(_startPosition, '!'));
if (isTripleQuoted)
{
_textValue = CharSource.Slice(_startPosition + 3, InputPosition - _startPosition - 6).ToString();
}
else
{
_textValue = CharSource.Slice(_startPosition + 1, InputPosition - _startPosition - 2).ToString();
}
}
return(_textValue);
}
void ParseIdOrSymbol(int start, bool isBQString)
{
UString unparsed = CharSource.Slice(start, InputPosition - start);
UString parsed;
Debug.Assert(isBQString == (CharSource.TryGet(start, '\0') == '`'));
Debug.Assert(!_verbatim);
if (!_idCache.TryGetValue(unparsed, out _value))
{
if (isBQString)
{
parsed = ParseStringCore(start);
}
else if (_parseNeeded)
{
parsed = ScanNormalIdentifier(unparsed);
}
else
{
parsed = unparsed;
}
_idCache[unparsed.ShedExcessMemory(50)] = _value = GSymbol.Get(parsed.ToString());
}
}
protected UString GetUnescapedString(bool hasEscapes, bool isTripleQuoted)
{
UString value;
if (hasEscapes)
{
UString original = Text();
value = UnescapeQuotedString(ref original, Error, IndentString, true);
Debug.Assert(original.IsEmpty);
}
else
{
Debug.Assert(CharSource.TryGet(InputPosition - 1, '?') == CharSource.TryGet(_startPosition, '!'));
if (isTripleQuoted)
{
value = CharSource.Slice(_startPosition + 3, InputPosition - _startPosition - 6).ToString();
}
else
{
value = CharSource.Slice(_startPosition + 1, InputPosition - _startPosition - 2).ToString();
}
}
return(value);
}
