PropertyHelper.h

#ifndef MANTID_KERNEL_PROPERTYHELPER_H_
#define MANTID_KERNEL_PROPERTYHELPER_H_

#ifndef Q_MOC_RUN
#include <boost/lexical_cast.hpp>
#include <boost/make_shared.hpp>
#endif

#include "MantidKernel/OptionalBool.h"
#include "MantidKernel/StringTokenizer.h"

namespace Mantid {
namespace Kernel {

// --------------------- convert values to strings
namespace {
/// Convert values to strings.
template <typename T> std::string toString(const T &value) {
  return boost::lexical_cast<std::string>(value);
}

/// Throw an exception if a shared pointer is converted to a string.
template <typename T> std::string toString(const boost::shared_ptr<T> &value) {
  UNUSED_ARG(value);
  throw boost::bad_lexical_cast();
}

/// Specialisation for a property of type std::vector.
template <typename T>
std::string toString(const std::vector<T> &value,
                     const std::string &delimiter = ",") {
  std::stringstream result;
  std::size_t vsize = value.size();
  for (std::size_t i = 0; i < vsize; ++i) {
    result << value[i];
    if (i + 1 != vsize)
      result << delimiter;
  }
  return result.str();
}

/// Specialisation for a property of type std::vector<std::vector>.
template <typename T>
std::string toString(const std::vector<std::vector<T>> &value,
                     const std::string &outerDelimiter = ",",
                     const std::string &innerDelimiter = "+") {
  std::stringstream result;
  std::size_t vsize = value.size();
  for (std::size_t i = 0; i < vsize; ++i) {
    std::size_t innervsize = value[i].size();
    for (std::size_t j = 0; j < innervsize; ++j) {
      result << value[i][j];
      if (j + 1 != innervsize)
        result << innerDelimiter;
    }

    if (i + 1 != vsize)
      result << outerDelimiter;
  }
  return result.str();
}

/// Specialisation for any type, should be appropriate for properties with a
/// single value.
template <typename T> int findSize(const T &) { return 1; }

/// Specialisation for properties that are of type vector.
template <typename T> int findSize(const std::vector<T> &value) {
  return static_cast<int>(value.size());
}

// ------------- Convert strings to values
template <typename T>
inline void appendValue(const std::string &strvalue, std::vector<T> &value) {
  // try to split the string
  std::size_t pos = strvalue.find(':');
  if (pos == std::string::npos) {
    pos = strvalue.find('-', 1);
  }

  // just convert the whole thing into a value
  if (pos == std::string::npos) {
    value.push_back(boost::lexical_cast<T>(strvalue));
    return;
  }

  // convert the input string into boundaries and run through a list
  T start = boost::lexical_cast<T>(strvalue.substr(0, pos));
  T stop = boost::lexical_cast<T>(strvalue.substr(pos + 1));
  for (T i = start; i <= stop; i++)
    value.push_back(i);
}

template <typename T> void toValue(const std::string &strvalue, T &value) {
  value = boost::lexical_cast<T>(strvalue);
}

template <typename T>
void toValue(const std::string &, boost::shared_ptr<T> &) {
  throw boost::bad_lexical_cast();
}

namespace detail {
// vector<int> specializations
template <typename T>
void toValue(const std::string &strvalue, std::vector<T> &value,
             std::true_type) {
  typedef Mantid::Kernel::StringTokenizer tokenizer;
  tokenizer values(strvalue, ",",
                   tokenizer::TOK_IGNORE_EMPTY | tokenizer::TOK_TRIM);
  value.clear();
  value.reserve(values.count());
  for (const auto &token : values) {
    appendValue(token, value);
  }
}

template <typename T>
void toValue(const std::string &strvalue, std::vector<T> &value,
             std::false_type) {
  // Split up comma-separated properties
  typedef Mantid::Kernel::StringTokenizer tokenizer;
  tokenizer values(strvalue, ",",
                   tokenizer::TOK_IGNORE_EMPTY | tokenizer::TOK_TRIM);

  value.clear();
  value.reserve(values.count());
  std::transform(
      values.cbegin(), values.cend(), std::back_inserter(value),
      [](const std::string &str) { return boost::lexical_cast<T>(str); });
}

// bool and char don't make sense as types to generate a range of values.
// This is similar to std::is_integral<T>, but bool and char are std::false_type
template <class T> struct is_range_type : public std::false_type {};
template <class T> struct is_range_type<const T> : public is_range_type<T> {};
template <class T>
struct is_range_type<volatile const T> : public is_range_type<T> {};
template <class T>
struct is_range_type<volatile T> : public is_range_type<T> {};

template <> struct is_range_type<uint16_t> : public std::true_type {};
template <> struct is_range_type<uint32_t> : public std::true_type {};
template <> struct is_range_type<uint64_t> : public std::true_type {};

template <> struct is_range_type<int16_t> : public std::true_type {};
template <> struct is_range_type<int32_t> : public std::true_type {};
template <> struct is_range_type<int64_t> : public std::true_type {};
}
template <typename T>
void toValue(const std::string &strvalue, std::vector<T> &value) {
  detail::toValue(strvalue, value, detail::is_range_type<T>());
}

template <typename T>
void toValue(const std::string &strvalue, std::vector<std::vector<T>> &value,
             const std::string &outerDelimiter = ",",
             const std::string &innerDelimiter = "+") {
  typedef Mantid::Kernel::StringTokenizer tokenizer;
  tokenizer tokens(strvalue, outerDelimiter,
                   tokenizer::TOK_IGNORE_EMPTY | tokenizer::TOK_TRIM);

  value.clear();
  value.reserve(tokens.count());

  for (const auto &token : tokens) {
    tokenizer values(token, innerDelimiter,
                     tokenizer::TOK_IGNORE_EMPTY | tokenizer::TOK_TRIM);
    std::vector<T> vect;
    vect.reserve(values.count());
    std::transform(
        values.begin(), values.end(), std::back_inserter(vect),
        [](const std::string &str) { return boost::lexical_cast<T>(str); });
    value.push_back(std::move(vect));
  }
}

/*Used specifically to retrieve a vector of type T populated with values
 * given to it from strvalue parameter, Using toValue method.
 (See constructor used specifically for vector assignments)
 */
template <typename T> T extractToValueVector(const std::string &strvalue) {
  T valueVec;
  toValue(strvalue, valueVec);
  return valueVec;
}

//------------------------------------------------------------------------------------------------
// Templated += operator functions for specific types
template <typename T> inline void addingOperator(T &lhs, const T &rhs) {
  // The cast here (and the expansion of the compound operator which that
  // necessitates) is because if this function is created for a template
  // type narrower than an int, the compiler will expande the operands to
  // ints which leads to a compiler warning when it's assigned back to the
  // narrower type.
  lhs = static_cast<T>(lhs + rhs);
}

template <typename T>
inline void addingOperator(std::vector<T> &lhs, const std::vector<T> &rhs) {
  // This concatenates the two
  if (&lhs != &rhs) {
    lhs.insert(lhs.end(), rhs.begin(), rhs.end());
  } else {
    std::vector<T> rhs_copy(rhs);
    lhs.insert(lhs.end(), rhs_copy.begin(), rhs_copy.end());
  }
}

template <> inline void addingOperator(bool &, const bool &) {
  throw Exception::NotImplementedError(
      "PropertyWithValue.h: += operator not implemented for type bool");
}

template <> inline void addingOperator(OptionalBool &, const OptionalBool &) {
  throw Exception::NotImplementedError(
      "PropertyWithValue.h: += operator not implemented for type OptionalBool");
}

template <typename T>
inline void addingOperator(boost::shared_ptr<T> &,
                           const boost::shared_ptr<T> &) {
  throw Exception::NotImplementedError(
      "PropertyWithValue.h: += operator not implemented for boost::shared_ptr");
}

template <typename T>
inline std::vector<std::string>
determineAllowedValues(const T &, const IValidator &validator) {
  return validator.allowedValues();
}

template <>
inline std::vector<std::string> determineAllowedValues(const OptionalBool &,
                                                       const IValidator &) {
  auto enumMap = OptionalBool::enumToStrMap();
  std::vector<std::string> values;
  values.reserve(enumMap.size());
  std::transform(enumMap.cbegin(), enumMap.cend(), std::back_inserter(values),
                 [](const std::pair<OptionalBool::Value, std::string> &str) {
                   return str.second;
                 });
  return values;
}
}

} // namespace Kernel
} // namespace Mantid

#endif /* MANTID_KERNEL_PROPERTYHELPER_H_ */