private static void SkipCommentsAndWhitespace(ITextStream scanner)
{
while (true)
{
// skip leading and trailing whitespace
JsonTokenizer.SkipWhitespace(scanner);
// check for block and line comments
if (scanner.IsCompleted || scanner.Peek() != JsonGrammar.OperatorCommentBegin[0])
{
return;
}
// read first char of comment start
scanner.Pop();
// store for unterminated case
long commentStart = scanner.Index;
int commentCol = scanner.Column;
int commentLine = scanner.Line;
if (scanner.IsCompleted)
{
throw new DeserializationException(JsonTokenizer.ErrorUnterminatedComment, commentStart, commentLine, commentCol);
}
// peek second char of comment start
char ch = scanner.Peek();
bool isBlockComment;
if (ch == JsonGrammar.OperatorCommentBegin[1])
{
isBlockComment = true;
}
else if (ch == JsonGrammar.OperatorCommentLine[1])
{
isBlockComment = false;
}
else
{
throw new DeserializationException(JsonTokenizer.ErrorUnterminatedComment, commentStart, commentLine, commentCol);
}
// start reading comment content
if (isBlockComment)
{
// skip over everything until reach block comment ending
while (true)
{
do
{
scanner.Pop();
if (scanner.IsCompleted)
{
throw new DeserializationException(JsonTokenizer.ErrorUnterminatedComment, commentStart, commentLine, commentCol);
}
} while (scanner.Peek() != JsonGrammar.OperatorCommentEnd[0]);
scanner.Pop();
if (scanner.IsCompleted)
{
throw new DeserializationException(JsonTokenizer.ErrorUnterminatedComment, commentStart, commentLine, commentCol);
}
if (scanner.Peek() == JsonGrammar.OperatorCommentEnd[1])
{
// move past block comment end token
scanner.Pop();
break;
}
}
}
else
{
// skip over everything until reach line ending or end of input
do
{
scanner.Pop();
ch = scanner.Peek();
} while (!scanner.IsCompleted && ('\r' != ch) && ('\n' != ch));
}
}
}
