MessageAst ParseMsg(bool endWithEOF)
{
MessageAst res = null;
while (true)
{
if (_curToken == _errorToken)
{
return(BuildError());
}
if (_curToken == _eOFToken)
{
if (endWithEOF)
{
if (res == null)
{
return(new TextAst(""));
}
return(res);
}
return(BuildError("Unexpected end of message missing \"}\""));
}
MessageAst val = null;
if (_curToken == _openBracketToken)
{
AdvanceNextToken();
val = ParseFormat();
}
else if (_curToken == _hashToken)
{
AdvanceNextToken();
val = new HashAst();
}
else if (_curToken == _closeBracketToken)
{
if (endWithEOF)
{
return(BuildError("Unexpected \"}\". Maybe you forgot to prefix it with \"\\\"."));
}
AdvanceNextToken();
if (res == null)
{
return(new TextAst(""));
}
return(res);
}
else
{
_sb.Clear();
while (_curToken >= 0)
{
AppendCurTokenToSb();
AdvanceNextToken();
}
val = new TextAst(_sb.ToString());
}
if (IsError(val))
{
return(val);
}
if (res == null)
{
res = val;
}
else
{
if (res is ListAst)
{
((ListAst)res).Add(val);
}
else
{
res = new ListAst(res, val);
}
}
}
}
MessageAst ParseMsg(int endWithEOF)
{
MessageAst?res = null;
var wrapByConcat = false;
MessageAst Normalize(MessageAst?res)
{
if (res == null)
{
return(new TextAst(""));
}
if (wrapByConcat && (res is ListAst list))
{
return(new ConcatAst(list));
}
return(res);
}
while (true)
{
if (_curToken == _errorToken)
{
return(BuildError());
}
if (_curToken == _eOFToken)
{
if (endWithEOF == -2)
{
return(Normalize(res));
}
if (endWithEOF >= 0)
{
return(BuildError("Unexpected end of message. Missing end of element {/" + endWithEOF + "}"));
}
return(BuildError("Unexpected end of message. Missing \"}\""));
}
MessageAst val;
if (_curToken == _openBracketToken)
{
AdvanceNextToken();
val = ParseFormat();
if (val is StartElAst start)
{
var nested = ParseMsg(start.Id);
if (IsError(nested))
{
return(nested);
}
wrapByConcat = true;
val = new ElAst {
Id = start.Id, Value = nested
};
}
else if (val is CloseElAst close)
{
if (close.Id == endWithEOF)
{
return(Normalize(res));
}
return(BuildError($"Missing {{/{endWithEOF}}}, got {{/{close.Id}}} instead."));
}
else if (val is ElAst)
{
wrapByConcat = true;
}
}
else if (_curToken == _hashToken)
{
AdvanceNextToken();
val = new HashAst();
}
else if (_curToken == _closeBracketToken)
{
if (endWithEOF != -1)
{
return(BuildError("Unexpected \"}\". Maybe you forgot to prefix it with \"\\\"."));
}
AdvanceNextToken();
return(Normalize(res));
}
else
{
_sb.Clear();
while (_curToken >= 0)
{
AppendCurTokenToSb();
AdvanceNextToken();
}
val = new TextAst(_sb.ToString());
}
if (IsError(val))
{
return(val);
}
if (res == null)
{
res = val;
}
else
{
if (res is ListAst)
{
((ListAst)res).Add(val);
}
else
{
res = new ListAst(res, val);
}
}
}
}
