StringType Filter(SourceCode& sourceCode)
{
StringType res;
while (true)
{
if (sourceCode.AdvanceIfMatch('\"'))
{
res += OnLiterals(sourceCode,'\"');
}
else if (sourceCode.AdvanceIfMatch('\''))
{
res += OnLiterals(sourceCode,'\'');
}
else if (sourceCode.AdvanceIfMatch("/*"s))
{
OnMultiLine(sourceCode);
}
else if (sourceCode.AdvanceIfMatch("//"s))
{
OnSingleLine(sourceCode);
}
else
{
auto c = sourceCode.NextChar();
if (c == InvalidCharacter)
break;
res += c;
}
}
return res;
}
StringType OnLiterals(SourceCode& sourceCode,char endChar)
{
StringType res;
res += endChar;
while (true)
{
if (sourceCode.AdvanceIfMatch('\\'))
{
res += '\\';
res += sourceCode.NextChar();
}
else if (sourceCode.AdvanceIfMatch(endChar))
{
res += endChar;
return std::move(res);
}
else
{
auto c = sourceCode.NextChar();
if (c == InvalidCharacter)
break;
res += c;
}
}
std::string exp;
(exp += endChar) += " lost";
throw SyntaxError(exp.c_str());
}
void OnMultiLine(SourceCode& sourceCode)
{
while (sourceCode.IsPosValid())
if (sourceCode.AdvanceIfMatch("*/"s))
return;
else
sourceCode.AdvanceChar();
throw SyntaxError("*/ lost");
}
