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#ifndef LVOC_H
#define LVOC_H
#include<map>
#include<vector>
#include<iostream>
#include<fstream>
#include <sstream>
typedef unsigned LabelId;
extern const LabelId InvalidLabelId;
extern const LabelId Epsilon;
typedef std::vector<LabelId> IPhrase;
// A = type of things to numberize, ie, std::string
// B = map type to use, might consider using hash_map for better performance
template<typename A,typename B=std::map<A,LabelId> >
class LVoc {
typedef A Key;
typedef B M;
typedef std::vector<Key> V;
M m;
V data;
public:
LVoc() {}
bool isKnown(const Key& k) const {return m.find(k)!=m.end();}
LabelId index(const Key& k) const {
typename M::const_iterator i=m.find(k);
return i!=m.end()? i->second : InvalidLabelId;}
LabelId add(const Key& k) {
std::pair<typename M::iterator,bool> p
=m.insert(std::make_pair(k,data.size()));
if(p.second) data.push_back(k);
assert(static_cast<size_t>(p.first->second)<data.size());
return p.first->second;
}
Key const& symbol(LabelId i) const {
assert(static_cast<size_t>(i)<data.size());
return data[i];}
typedef typename V::const_iterator const_iterator;
const_iterator begin() const {return data.begin();}
const_iterator end() const {return data.end();}
void Write(const std::string& fname) const {
std::ofstream out(fname.c_str()); Write(out);}
void Write(std::ostream& out) const {
for(int i=data.size()-1;i>=0;--i)
out<<i<<' '<<data[i]<<'\n';
}
void Read(const std::string& fname) {
std::ifstream in(fname.c_str());Read(in);}
void Read(std::istream& in) {
Key k;size_t i;std::string line;
while(getline(in,line)) {
std::istringstream is(line);
if(is>>i>>k) {
if(i>=data.size()) data.resize(i+1);
data[i]=k;
m[k]=i;
}
}
}
};
#endif //LVOC_H
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