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#ifndef NT_SPAN_H
#define NT_SPAN_H
#include <iostream>
#include "wordid.h"
#include "tdict.h"
struct Span {
int l,r;
Span() : l(-1), r(-1) { }
bool is_null() const { return l<0; }
void print(std::ostream &o,char const* for_null="") const {
if (is_null())
o<<for_null;
else
o<<'<'<<l<<','<<r<<'>';
}
friend inline std::ostream &operator<<(std::ostream &o,Span const& s) {
s.print(o);return o;
}
};
struct NTSpan {
Span s;
WordID nt; // awkward: this is a positive index, used in TD. but represented as negative in mixed terminal/NT space in rules/hgs.
NTSpan() : nt(0) { }
// prints as possibly empty name (whatever you set of nt,s will show)
void print(std::ostream &o,char const* for_span_null="_",char const* for_null="") const {
if (nt>0) {
o<<TD::Convert(nt);
s.print(o,for_span_null);
} else
s.print(o,for_null);
}
friend inline std::ostream &operator<<(std::ostream &o,NTSpan const& t) {
t.print(o);return o;
}
};
#endif
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