skeleton implementation of new color class

diff --git a/ginac/color.cpp b/ginac/color.cpp
new file mode 100644 (file)
index 0000000..cd3179a
--- /dev/null
+++ b/ginac/color.cpp
@@ -0,0 +1,191 @@
+/** @file color.cpp
+ *
+ *  Implementation of GiNaC's color (SU(3) Lie algebra) objects. */
+
+/*
+ *  GiNaC Copyright (C) 1999-2001 Johannes Gutenberg University Mainz, Germany
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "color.h"
+#include "ex.h"
+#include "ncmul.h"
+#include "numeric.h"
+#include "archive.h"
+#include "debugmsg.h"
+#include "utils.h"
+
+namespace GiNaC {
+
+GINAC_IMPLEMENT_REGISTERED_CLASS(color, indexed)
+GINAC_IMPLEMENT_REGISTERED_CLASS(su3one, tensor)
+GINAC_IMPLEMENT_REGISTERED_CLASS(su3t, tensor)
+GINAC_IMPLEMENT_REGISTERED_CLASS(su3f, tensor)
+GINAC_IMPLEMENT_REGISTERED_CLASS(su3d, tensor)
+
+//////////
+// default constructor, destructor, copy constructor assignment operator and helpers
+//////////
+
+color::color() : representation_label(0)
+{
+       debugmsg("color default constructor", LOGLEVEL_CONSTRUCT);
+       tinfo_key = TINFO_color;
+}
+
+void color::copy(const color & other)
+{
+       inherited::copy(other);
+       representation_label = other.representation_label;
+}
+
+DEFAULT_DESTROY(color)
+DEFAULT_CTORS(su3one)
+DEFAULT_CTORS(su3t)
+DEFAULT_CTORS(su3f)
+DEFAULT_CTORS(su3d)
+
+//////////
+// other constructors
+//////////
+
+/** Construct object without any color index. This constructor is for
+ *  internal use only. Use the color_ONE() function instead.
+ *  @see color_ONE */
+color::color(const ex & b, unsigned rl = 0) : inherited(b), representation_label(rl)
+{
+       debugmsg("color constructor from ex,unsigned", LOGLEVEL_CONSTRUCT);
+       tinfo_key = TINFO_color;
+}
+
+/** Construct object with one color index. This constructor is for internal
+ *  use only. Use the color_T() function instead.
+ *  @see color_T */
+color::color(const ex & b, const ex & i1, unsigned rl = 0) : inherited(b, i1), representation_label(rl)
+{
+       debugmsg("color constructor from ex,ex,unsigned", LOGLEVEL_CONSTRUCT);
+       tinfo_key = TINFO_color;
+}
+
+color::color(unsigned rl, const exvector & v, bool discardable) : inherited(indexed::unknown, v, discardable), representation_label(rl)
+{
+       debugmsg("color constructor from unsigned,exvector", LOGLEVEL_CONSTRUCT);
+       tinfo_key = TINFO_color;
+}
+
+color::color(unsigned rl, exvector * vp) : inherited(indexed::unknown, vp), representation_label(rl)
+{
+       debugmsg("color constructor from unsigned,exvector *", LOGLEVEL_CONSTRUCT);
+       tinfo_key = TINFO_color;
+}
+
+//////////
+// archiving
+//////////
+
+color::color(const archive_node &n, const lst &sym_lst) : inherited(n, sym_lst)
+{
+       debugmsg("color constructor from archive_node", LOGLEVEL_CONSTRUCT);
+       n.find_unsigned("representation", representation_label);
+}
+
+void color::archive(archive_node &n) const
+{
+       inherited::archive(n);
+       n.add_unsigned("representation", representation_label);
+}
+
+DEFAULT_UNARCHIVE(color)
+DEFAULT_ARCHIVING(su3one)
+DEFAULT_ARCHIVING(su3t)
+DEFAULT_ARCHIVING(su3f)
+DEFAULT_ARCHIVING(su3d)
+
+//////////
+// functions overriding virtual functions from bases classes
+//////////
+
+int color::compare_same_type(const basic & other) const
+{
+       GINAC_ASSERT(other.tinfo() == TINFO_color);
+       const color &o = static_cast<const color &>(other);
+
+       if (representation_label != o.representation_label) {
+               // different representation label
+               return representation_label < o.representation_label ? -1 : 1;
+       }
+
+       return inherited::compare_same_type(other);
+}
+
+DEFAULT_COMPARE(su3one)
+DEFAULT_COMPARE(su3t)
+DEFAULT_COMPARE(su3f)
+DEFAULT_COMPARE(su3d)
+
+DEFAULT_PRINT(su3one, "ONE")
+DEFAULT_PRINT(su3t, "T")
+DEFAULT_PRINT(su3f, "f")
+DEFAULT_PRINT(su3d, "d")
+
+/** Perform automatic simplification on noncommutative product of color
+ *  objects. This removes superfluous ONEs. */
+ex color::simplify_ncmul(const exvector & v) const
+{
+       //!! to be implemented
+       return nonsimplified_ncmul(v);
+}
+
+ex color::thisexprseq(const exvector & v) const
+{
+       return color(representation_label, v);
+}
+
+ex color::thisexprseq(exvector * vp) const
+{
+       return color(representation_label, vp);
+}
+
+//////////
+// global functions
+//////////
+
+ex color_ONE(unsigned rl)
+{
+       return color(su3one(), rl);
+}
+
+ex color_T(const ex & a, unsigned rl)
+{
+       return color(su3t(), a, rl);
+}
+
+ex color_f(const ex & a, const ex & b, const ex & c)
+{
+       return indexed(su3f(), indexed::antisymmetric, a, b, c);
+}
+
+ex color_d(const ex & a, const ex & b, const ex & c)
+{
+       return indexed(su3d(), indexed::symmetric, a, b, c);
+}
+
+ex color_h(const ex & a, const ex & b, const ex & c)
+{
+       return color_d(a, b, c) + I * color_f(a, b, c);
+}
+
+} // namespace GiNaC