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#include "grammar.hh"
namespace G {
NT::NT(string& s)
{
s.erase(0, 1);
s.pop_back();
stringstream ss(s);
string buf;
size_t c = 0;
index = 0;
while (ss.good() && getline(ss, buf, ',')) {
if (c == 0) {
symbol = buf;
} else {
index = stoi(buf);
}
c++;
}
}
T::T(string& s)
{
word = s;
}
Item::Item(string& s)
{
if (s.front() == '[' && s.back() == ']') {
type = NON_TERMINAL;
nt = new NT(s);
} else {
type = TERMINAL;
t = new T(s);
}
}
Rule::Rule(string& s)
{
stringstream ss(s);
size_t c = 0;
string buf;
while (ss >> buf) {
if (buf == "|||") { c++; continue; }
if (c == 0) { // LHS
lhs = new NT(buf);
} else if (c == 1) { // RHS
rhs.push_back(new Item(buf));
if (rhs.back()->type == NON_TERMINAL) arity++;
} else if (c == 2) { // TARGET
target.push_back(new Item(buf));
} else if (c == 3) { // F TODO
} else if (c == 4) { // A TODO
} else { // ERROR FIXME
}
if (c == 4) break;
}
arity = 0;
}
Grammar::Grammar(string fn)
{
ifstream ifs(fn);
string line;
while (getline(ifs, line)) {
G::Rule* r = new G::Rule(line);
rules.push_back(r);
if (r->arity == 0)
flat.push_back(r);
else if (r->rhs.front()->type == NON_TERMINAL)
start_nt.push_back(r);
else
start_t.push_back(r);
}
}
string
Item::repr() const
{
ostringstream os;
if (type == TERMINAL)
os << t->repr();
else
os << nt->repr();
return os.str();
}
ostream&
operator<<(ostream& os, const Item& i)
{
return os << i.repr();
}
string
NT::repr() const
{
ostringstream os;
os << "NT<" << symbol << "," << index << ">";
return os.str();
}
ostream&
operator<<(ostream& os, const NT& nt)
{
return os << nt.repr();
}
string
T::repr() const
{
ostringstream os;
os << "T<" << word << ">";
return os.str();
}
ostream&
operator<<(ostream& os, const T& t)
{
return os << t.repr();
}
string
Rule::repr() const
{
ostringstream os;
os << "Rule<lhs=" << lhs->repr() << \
", rhs:{";
for (auto it = rhs.begin(); it != rhs.end(); it++) {
os << (**it).repr();
if (next(it) != rhs.end()) os << " ";
}
os << "}, target:{";
for (auto it = target.begin(); it != target.end(); it++) {
os << (**it).repr();
if (next(it) != target.end()) os << " ";
}
os << "}" \
", f:" << "TODO" << \
", arity=" << arity << \
", map:" << "TODO" << \
">";
return os.str();
}
ostream&
operator<<(ostream& os, const Rule& r)
{
return os << r.repr();
}
ostream&
operator<<(ostream& os, const Grammar& g)
{
for (auto it = g.rules.begin(); it != g.rules.end(); it++)
os << (**it).repr() << endl;
return os;
}
} // namespace
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