#ifndef _TEXTSPLIT_H_INCLUDED_
#define _TEXTSPLIT_H_INCLUDED_
/* @(#$Id: textsplit.h,v 1.8 2005-10-19 10:21:48 dockes Exp $ (C) 2004 J.F.Dockes */
#include <string>
#ifndef NO_NAMESPACES
using std::string;
#endif
/**
* Function class whose takeword method is called for every detected word while * splitting text.
*/
class TextSplitCB {
public:
virtual ~TextSplitCB() {}
virtual bool takeword(const std::string& term,
int pos, // term pos
int bts, // byte offset of first char in term
int bte // byte offset of first char after term
) = 0;
};
/**
* Split text into words.
* See comments at top of .cpp for more explanations.
* This uses a callback function. It could be done with an iterator instead,
* but 'ts much simpler this way...
*/
class TextSplit {
bool fq; // for query: Are we splitting for query or index ?
// It may happen that our cleanup would result in emitting the
// same term twice. We try to avoid this
string prevterm;
int prevpos;
TextSplitCB *cb;
int maxWordLength;
bool emitterm(bool isspan, std::string &term, int pos, int bs, int be);
bool doemit(string &word, int &wordpos, string &span, int spanpos,
bool spanerase, int bp);
public:
/**
* Constructor: just store callback object
*/
TextSplit(TextSplitCB *t, bool forquery = false)
: fq(forquery), prevpos(-1), cb(t), maxWordLength(40) {}
/**
* Split text, emit words and positions.
*/
bool text_to_words(const std::string &in);
};
#endif /* _TEXTSPLIT_H_INCLUDED_ */