grpc/src/compiler/ruby_generator_string-inl.h

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#ifndef GRPC_INTERNAL_COMPILER_RUBY_GENERATOR_STRING_INL_H
#define GRPC_INTERNAL_COMPILER_RUBY_GENERATOR_STRING_INL_H

#include <algorithm>
#include <string>
#include <sstream>
#include <vector>

using std::getline;
using std::transform;

namespace grpc_ruby_generator {

// Split splits a string using char into elems.
inline std::vector<std::string> &Split(const std::string &s, char delim,
                                       std::vector<std::string> *elems) {
  std::stringstream ss(s);
  std::string item;
  while (getline(ss, item, delim)) {
    elems->push_back(item);
  }
  return *elems;
}

// Split splits a string using char, returning the result in a vector.
inline std::vector<std::string> Split(const std::string &s, char delim) {
  std::vector<std::string> elems;
  Split(s, delim, &elems);
  return elems;
}

// Replace replaces from with to in s.
inline std::string Replace(std::string s, const std::string &from,
                           const std::string &to) {
  size_t start_pos = s.find(from);
  if (start_pos == std::string::npos) {
    return s;
  }
  s.replace(start_pos, from.length(), to);
  return s;
}

// ReplaceAll replaces all instances of search with replace in s.
inline std::string ReplaceAll(std::string s, const std::string &search,
                              const std::string &replace) {
  size_t pos = 0;
  while ((pos = s.find(search, pos)) != std::string::npos) {
    s.replace(pos, search.length(), replace);
    pos += replace.length();
  }
  return s;
}

// ReplacePrefix replaces from with to in s if search is a prefix of s.
inline bool ReplacePrefix(std::string *s, const std::string &from,
                          const std::string &to) {
  size_t start_pos = s->find(from);
  if (start_pos == std::string::npos || start_pos != 0) {
    return false;
  }
  s->replace(start_pos, from.length(), to);
  return true;
}

// CapitalizeFirst capitalizes the first char in a string.
inline std::string CapitalizeFirst(std::string s) {
  if (s.empty()) {
    return s;
  }
  s[0] = ::toupper(s[0]);
  return s;
}

// RubyTypeOf updates a proto type to the required ruby equivalent.
inline std::string RubyTypeOf(const std::string &a_type,
                              const std::string &package) {
  std::string res(a_type);
  ReplacePrefix(&res, package, "");  // remove the leading package if present
  ReplacePrefix(&res, ".", "");      // remove the leading . (no package)
  if (res.find('.') == std::string::npos) {
    return res;
  } else {
    std::vector<std::string> prefixes_and_type = Split(res, '.');
    for (unsigned int i = 0; i < prefixes_and_type.size(); ++i) {
      if (i != 0) {
        res += "::";  // switch '.' to the ruby module delim
      }
      if (i < prefixes_and_type.size() - 1) {
        res += CapitalizeFirst(prefixes_and_type[i]);  // capitalize pkgs
      } else {
        res += prefixes_and_type[i];
      }
    }
    return res;
  }
}

}  // namespace grpc_ruby_generator

#endif  // GRPC_INTERNAL_COMPILER_RUBY_GENERATOR_STRING_INL_H