// file      : xsde/cxx/parser/validating/float.cxx
// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file

#include <stdlib.h> // strtof, strtod

#include <xsde/cxx/config.hxx>
#include <xsde/cxx/errno.hxx>

#include <xsde/cxx/parser/validating/float.hxx>

namespace xsde
{
  namespace cxx
  {
    namespace parser
    {
      namespace validating
      {
        void float_pimpl::
        _pre ()
        {
          size_ = 0;
          sign_ = none;
          state_ = leading_ws;
        }

        void float_pimpl::
        _characters (const ro_string& s)
        {
          if (!parse (s, str_, 127))
            _schema_error (schema_error::invalid_float_value);
        }

        void float_pimpl::
        _post ()
        {
          ro_string tmp (str_, size_);
          size_t size = trim_right (tmp);

          if (size != 0 && tmp[0] != '-' && tmp[0] != '+')
          {
            str_[size] = '\0';

            if (tmp == "INF")
            {
              switch (sign_)
              {
              case none:
                {
#ifdef XSDE_STRTOF
                  value_ = strtof ("INF", 0);
#else
                  value_ = static_cast<float> (strtod ("INF", 0));
#endif
                  break;
                }
              case plus:
                {
                  _schema_error (schema_error::invalid_float_value);
                  break;
                }
              case minus:
                {
#ifdef XSDE_STRTOF
                  value_ = strtof ("-INF", 0);
#else
                  value_ = static_cast<float> (strtod ("-INF", 0));
#endif
                  break;
                }
              }
            }
            else if (tmp == "NaN")
            {
              if (sign_ == none)
              {
#ifdef XSDE_STRTOF
                value_ = strtof ("NAN", 0);
#else
                value_ = static_cast<float> (strtod ("NAN", 0));
#endif
              }
              else
                _schema_error (schema_error::invalid_float_value);

            }
            else
            {
              char* p;
              set_errno (0);
#ifdef XSDE_STRTOF
              value_ = strtof (str_, &p);
#else
              value_ = static_cast<float> (strtod (str_, &p));
#endif

              if (*p != '\0' || get_errno () != 0)
                _schema_error (schema_error::invalid_float_value);

              if (sign_ == minus)
                value_ = -value_;
            }

            // Check facets.
            //
            const facets& f = _facets ();

            if (f.min_set_ &&
                (value_ < f.min_ || (!f.min_inc_ && value_ == f.min_)))
            {
              _schema_error (schema_error::value_less_than_min);
              return;
            }

            if (f.max_set_ &&
                (value_ > f.max_ || (!f.max_inc_ && value_ == f.max_)))
            {
              _schema_error (schema_error::value_greater_than_max);
              return;
            }
          }
          else
            _schema_error (schema_error::invalid_float_value);
        }

        float float_pimpl::
        post_float ()
        {
          return value_;
        }
      }
    }
  }
}
