string bmlwriter::unescape(cstring val)
{
if (!val.startswith("-")) return val;
string out;
for (size_t i=1;i<val.length();i++)
{
if (val[i]=='-')
{
byte tmp;
if (val[i+1]=='-')
{
i++;
out += '-';
}
else if (fromstringhex(val.substr(i+1, i+3), tmp))
{
i += 2;
out += tmp;
}
}
else out += val[i];
}
return out;
}
string bmlwriter::escape(cstring val)
{
string esc = "-";
bool needescape = (val.startswith("-"));
for (byte c : val.bytes())
{
if (isalnum(c) || c=='.') esc+=c;
else if (c=='-') esc+="--";
else { esc+="-"+tostringhex<2>((uint8_t)c); needescape=true; }
}
if (needescape) return esc;
else return val;
}
//text must NOT start with &
static bool entity_match(const char * ent, cstring text)
{
size_t entlen = strlen(ent);
if (!text.startswith(ent)) return false;
return (text[entlen]==';' || ent[entlen+1]=='?');
}
