grammar.h

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#ifndef RIME_GRAMMAR_H_
#define RIME_GRAMMAR_H_
 
#include <rime/common.h>
#include <rime/component.h>
 
namespace rime {
 
class Config;
 
class Grammar : public Class<Grammar, Config*> {
 public:
  virtual ~Grammar() {}
  virtual double Query(const string& context,
                       const string& word,
                       bool is_rear) = 0;
 
  inline static double Evaluate(const string& context,
                                const string& entry_text,
                                double entry_weight,
                                bool is_rear,
                                Grammar* grammar) {
    // log(1e-6) ≈ -13.81
    const double kPenalty = -13.815510557964274;
    return entry_weight +
           (grammar ? grammar->Query(context, entry_text, is_rear) : kPenalty);
  }
};
 
}  // namespace rime
 
#endif  // RIME_GRAMMAR_H_