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#include "common.hh"
#include "header_parser.hh"
namespace stuff {
namespace {
bool read_token(std::string::const_iterator* begin,
const std::string::const_iterator& end,
bool to_lower,
std::string* out) {
auto i = *begin;
if (i == end) return false;
auto last = i;
out->clear();
do {
if ((*i >= '^' && *i <= 'z') ||
(!to_lower && *i >= 'A' && *i <= 'Z') ||
(*i >= '0' && *i <= '9') ||
(*i >= '#' && *i <= '\'') ||
*i == '!' || *i == '*' || *i == '+' || *i == '-' || *i == '.' ||
*i == '|' || *i == '~') {
++i;
} else if (to_lower && *i >= 'A' && *i <= 'Z') {
out->insert(out->end(), last, i);
out->push_back('a' + *i - 'A');
last = ++i;
} else {
break;
}
} while (i != end);
out->insert(out->end(), last, i);
*begin = i;
return true;
}
bool read_quoted(std::string::const_iterator* begin,
const std::string::const_iterator& end,
std::string* out) {
auto i = *begin;
if (i == end || *i != '"') return false;
auto last = ++i;
out->clear();
while (true) {
if (*i == '"') {
out->insert(out->end(), last, i);
*begin = ++i;
return true;
} else if (*i == '\\') {
out->insert(out->end(), last, i);
if (++i == end) return false;
if ((*i >= ' ' && *i <= '~') ||
*i == '\t' ||
(*i & 0x80)) {
out->push_back(*i);
last = ++i;
} else {
return false;
}
} else if ((*i >= '^' && *i <= '~') ||
(*i >= '#' && *i <= '[') ||
*i == '\t' || *i == ' ' ||
(*i & 0x80)) {
++i;
} else {
return false;
}
}
}
} // namespace
bool HeaderParser::parse(const std::string& in, std::string* token,
std::map<std::string, std::string>* parameters) {
auto i = in.begin();
while (i != in.end() && (*i == ' ' || *i == '\t')) ++i;
if (!read_token(&i, in.end(), true, token)) return false;
while (true) {
if (i == in.end() || *i != '/') break;
std::string tmp;
token->push_back('/');
++i;
if (!read_token(&i, in.end(), true, &tmp)) return false;
token->append(tmp);
}
if (parameters) parameters->clear();
while (i != in.end()) {
while (i != in.end() && (*i == ' ' || *i == '\t')) ++i;
if (i == in.end()) break;
if (*i != ';') return false;
++i;
while (i != in.end() && (*i == ' ' || *i == '\t')) ++i;
if (i == in.end()) return false;
std::string key, value;
if (!read_token(&i, in.end(), true, &key)) return false;
if (i == in.end() || *i != '=') return false;
++i;
if (i != in.end() && *i == '"') {
if (!read_quoted(&i, in.end(), &value)) return false;
} else {
if (!read_token(&i, in.end(), false, &value)) return false;
}
if (parameters) (*parameters)[key] = value;
}
return true;
}
} // namespace stuff
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