Token parse_constant(StringIteratorT begin, StringIteratorT end, const StringT & constant) {
StringIteratorT s = begin;
StringIteratorT c = constant.begin();
while (s != end && c != constant.end() && *c == *s) s++, c++;
if (c == constant.end()) {
return Token(begin, s);
} else {
return Token();
}
}
StringT unescape_string (const StringT & value) {
StringStreamT buffer;
StringT::const_iterator i = value.begin(), end = value.end();
// Skip enclosing quotes
++i;
--end;
for (; i < end; ++i) {
if (*i == '\\') {
++i;
switch (*i) {
case 't':
buffer << '\t';
continue;
case 'r':
buffer << '\r';
continue;
case 'n':
buffer << '\n';
continue;
case '\\':
buffer << '\\';
continue;
case '"':
buffer << '"';
continue;
case '\'':
buffer << '\'';
continue;
case 'x':
if ((end - i) >= 2) {
StringT::value_type value = Math::convert_to_digit(*(++i)) << 4;
value |= Math::convert_to_digit(*(++i));
buffer << (StringT::value_type)value;
continue;
} else {
break;
}
case '.':
continue;
}
throw std::runtime_error("Could not parse string escape!");
} else {
buffer << *i;
}
}
return buffer.str();
}
StringT escape_string (const StringT & value) {
StringStreamT buffer;
StringT::const_iterator i = value.begin(), end = value.end();
buffer << '"';
for (; i != end; ++i) {
if (*i == '"') {
buffer << "\\\"";
} else {
buffer << *i;
}
}
buffer << '"';
return buffer.str();
}
static bool matches(StringT const& str, std::basic_regex< CharT, ReTraitsT > const& expr, std::regex_constants::match_flag_type flags = std::regex_constants::match_default)
{
return std::regex_match(str.begin(), str.end(), expr, flags);
}
static bool matches(StringT const& str, compiled_type const& expr)
{
typedef typename StringT::const_iterator const_iterator;
const_iterator it = str.begin(), end = str.end();
return (spirit::qi::parse(it, end, expr) && it == end);
}