tokenizer.H

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#ifndef RERANKER_TOKENIZER_H_
#define RERANKER_TOKENIZER_H_

#include <string>
#include <vector>

namespace reranker {

#define SPACE_CHARS " \t"

using std::string;
using std::vector;

class Tokenizer {
 public:
  void Tokenize(const string &s, vector<string> &toks,
                const char *delimiters = " \t") const {
    size_t end_pos = 0;
    size_t begin_pos = 0;
    while (begin_pos != string::npos) {
      begin_pos = s.find_first_not_of(delimiters, end_pos);
      end_pos = s.find_first_of(delimiters, begin_pos);
      if (end_pos == string::npos) {
        end_pos = s.length();
      }
      if (begin_pos != string::npos) {
        toks.push_back(s.substr(begin_pos, end_pos - begin_pos));
        begin_pos = end_pos;
      }
    }
  }

  bool ParseSpecString(const string &spec,
                       string &class_name,
                       string &init_string,
                       bool &error) {
    error = false;
    size_t first_non_ws_idx = spec.find_first_not_of(SPACE_CHARS);
    if (first_non_ws_idx == string::npos) {
      // line is entirely ws
      return false;
    }

    size_t first_paren_idx = spec.find_first_of("(", first_non_ws_idx + 1);
    size_t last_paren_idx = spec.find_last_of(")");

    if (first_paren_idx == string::npos ||
        last_paren_idx == string::npos ||
        last_paren_idx < first_paren_idx) {
      error = true;
      return false;
    }
    class_name = spec.substr(first_non_ws_idx,
                                    first_paren_idx - first_non_ws_idx);
    size_t init_string_start_idx = first_paren_idx + 1;
    size_t init_string_len = last_paren_idx - init_string_start_idx;
    init_string = spec.substr(init_string_start_idx, init_string_len);
    return true;
  }
};

}  // namespace reranker

#endif