From f0510d2f90467de8e8f260b47d79a9baaf9bef17 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 17 Sep 2009 07:15:29 +0200
Subject: Start tracking XSD with git

---
 libxsd/xsd/cxx/tree/serialization/decimal.hxx | 126 ++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 libxsd/xsd/cxx/tree/serialization/decimal.hxx

(limited to 'libxsd/xsd/cxx/tree/serialization/decimal.hxx')

diff --git a/libxsd/xsd/cxx/tree/serialization/decimal.hxx b/libxsd/xsd/cxx/tree/serialization/decimal.hxx
new file mode 100644
index 0000000..3fa2297
--- /dev/null
+++ b/libxsd/xsd/cxx/tree/serialization/decimal.hxx
@@ -0,0 +1,126 @@
+// file      : xsd/cxx/tree/serialization/decimal.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2005-2009 Code Synthesis Tools CC
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef XSD_CXX_TREE_SERIALIZATION_DECIMAL_HXX
+#define XSD_CXX_TREE_SERIALIZATION_DECIMAL_HXX
+
+#include <limits> // std::numeric_limits
+#include <locale>
+#include <sstream>
+
+namespace xsd
+{
+  namespace cxx
+  {
+    namespace tree
+    {
+      namespace bits
+      {
+        // The formula for the number of decimla digits required is given in:
+        //
+        // http://www.open-std.org/JTC1/SC22/WG21/docs/papers/2005/n1822.pdf
+        //
+        template <typename C>
+        std::basic_string<C>
+        insert (const as_decimal<double>& d)
+        {
+          std::basic_ostringstream<C> os;
+          os.imbue (std::locale::classic ());
+          std::streamsize prec;
+
+          const facet* f = d.facets ?
+            facet::find (d.facets, facet::fraction_digits) : 0;
+
+          if (f)
+            prec = static_cast<std::streamsize> (f->value);
+          else
+          {
+            // Precision.
+            //
+#if defined (XSD_CXX_TREE_DECIMAL_PRECISION_MAX)
+            prec = 2 + std::numeric_limits<double>::digits * 301/1000;
+#elif defined (XSD_CXX_TREE_DECIMAL_PRECISION)
+            prec = XSD_CXX_TREE_DECIMAL_PRECISION;
+#else
+            prec = std::numeric_limits<double>::digits10;
+#endif
+          }
+
+          os.precision (prec);
+          os << std::fixed << d.x;
+          std::basic_string<C> r (os.str ());
+          const C* cr (r.c_str ());
+
+          // Remove the trailing zeros and the decimal point if necessary.
+          //
+          typename std::basic_string<C>::size_type size (r.size ()), n (size);
+
+          if (prec != 0)
+          {
+            for (; n > 0 && cr[n - 1] == '0'; --n)/*noop*/;
+
+            if (n > 0 && cr[n - 1] == '.')
+              --n;
+          }
+
+          // See if we have a restriction on total digits.
+          //
+          f = d.facets ? facet::find (d.facets, facet::total_digits) : 0;
+
+          if (f && n > f->value)
+          {
+            // Point and sign do not count so figure out if we have them.
+            //
+            typename std::basic_string<C>::size_type extra (
+              cr[0] == '-' ? 1 : 0);
+
+            if (r.find ('.') < n)
+              extra++;
+
+            // Unless we have a point and the size difference is one,
+            // remove some digits.
+            //
+            if ((n - extra) > f->value)
+              n -= (n - extra - f->value);
+
+            if (n > 0 && cr[n - 1] == '.')
+              --n;
+          }
+
+          if (n != size)
+            r.resize (n);
+
+          return r;
+        }
+      }
+
+      template <typename C>
+      inline void
+      operator<< (list_stream<C>& ls, const as_decimal<double>& d)
+      {
+        ls.os_ << bits::insert<C> (d);
+      }
+    }
+  }
+}
+
+namespace XERCES_CPP_NAMESPACE
+{
+  inline void
+  operator<< (xercesc::DOMElement& e,
+              const xsd::cxx::tree::as_decimal<double>& d)
+  {
+    e << xsd::cxx::tree::bits::insert<char> (d);
+  }
+
+  inline void
+  operator<< (xercesc::DOMAttr& a,
+              const xsd::cxx::tree::as_decimal<double>& d)
+  {
+    a << xsd::cxx::tree::bits::insert<char> (d);
+  }
+}
+
+#endif // XSD_CXX_TREE_SERIALIZATION_DECIMAL_HXX
-- 
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