Trim.hpp

/*
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * SUPPORT OPEN SCIENCE!  If you use OpenMD or its source code in your
 * research, please cite the appropriate papers when you publish your
 * work.  Good starting points are:
 *
 * [1] Meineke, et al., J. Comp. Chem. 26, 252-271 (2005).
 * [2] Fennell & Gezelter, J. Chem. Phys. 124, 234104 (2006).
 * [3] Sun, Lin & Gezelter, J. Chem. Phys. 128, 234107 (2008).
 * [4] Vardeman, Stocker & Gezelter, J. Chem. Theory Comput. 7, 834 (2011).
 * [5] Kuang & Gezelter, Mol. Phys., 110, 691-701 (2012).
 * [6] Lamichhane, Gezelter & Newman, J. Chem. Phys. 141, 134109 (2014).
 * [7] Lamichhane, Newman & Gezelter, J. Chem. Phys. 141, 134110 (2014).
 * [8] Bhattarai, Newman & Gezelter, Phys. Rev. B 99, 094106 (2019).
 */
 
#ifndef OPENMD_UTILS_TRIM_HPP
#define OPENMD_UTILS_TRIM_HPP
 
#include <algorithm>
#include <locale>
#include <string>
 
namespace OpenMD::Utils {
 
  /**
   * Remove all leading spaces in-place.
   * @param str An input sequence
   * @param loc The locale to use, defaults to std::locale
   */
  inline void trimLeft(std::string& str,
                       const std::locale& loc = std::locale()) {
    str.erase(str.begin(),
              std::find_if(str.begin(), str.end(),
                           [&loc](auto ch) { return !std::isspace(ch, loc); }));
  }
 
  /**
   * Remove all trailing spaces in-place.
   * @param str An input sequence
   * @param loc The locale to use, defaults to std::locale
   */
  inline void trimRight(std::string& str,
                        const std::locale& loc = std::locale()) {
    str.erase(std::find_if(str.rbegin(), str.rend(),
                           [&loc](auto ch) { return !std::isspace(ch, loc); })
                  .base(),
              str.end());
  }
 
  /**
   * Remove all leading and trailing spaces in-place
   * @param str An input sequence
   * @param loc The locale to use, defaults to std::locale
   */
  inline void trim(std::string& str, const std::locale& loc = std::locale()) {
    trimLeft(str, loc);
    trimRight(str, loc);
  }
 
  /**
   * Remove all leading spaces from the input.
   * @return A trimmed copy of the input
   * @param str An input sequence
   * @param loc The locale to use, defaults to std::locale
   */
  inline std::string trimLeftCopy(std::string str,
                                  const std::locale& loc = std::locale()) {
    trimLeft(str, loc);
    return str;
  }
 
  /**
   * Remove all trailing spaces from the input.
   * @return A trimmed copy of the input
   * @param str An input sequence
   * @param loc The locale to use, defaults to std::locale
   */
  inline std::string trimRightCopy(std::string str,
                                   const std::locale& loc = std::locale()) {
    trimRight(str, loc);
    return str;
  }
 
  /**
   * Remove all leading and trailing spaces from the input.
   * @return A trimmed copy of the input
   * @param str An input sequence
   * @param loc The locale to use, defaults to std::locale
   */
  inline std::string trimCopy(std::string str,
                              const std::locale& loc = std::locale()) {
    trim(str, loc);
    return str;
  }
}  // namespace OpenMD::Utils
 
#endif  // OPENMD_UTILS_TRIM_HPP