Implement string-valued registers \n[.m] and \n[.M] to return the

name of the current drawing and background color, respectively.

* src/roff/troff/symbol.h: Moved to...
* src/include/symbol.h: Here.
Small fixes to make it work outside of the `troff' directory.
* src/roff/troff/symbol.cpp: Moved to...
* src/libs/libgroff/symbol.cpp: Here.
Small fixes to make it work outside of the `troff' directory.

* src/include/Makefile.sub (HDRS), src/libs/libgroff/Makefile.sub
(OBJS, CCSRCS), src/roff/troff/Makefile.sub (OBJS, CCSRCS, HDRS):
Updated.

* src/include/color.h: Include symbol.h.
(color): Add new field `nm'.
* src/libs/libgroff/color.cpp (color::color): Updated.

* src/roff/troff/dictionary.cpp, src/roff/troff/div.cpp,
src/roff/troff/node.cpp, src/roff/troff/number.cpp,
src/roff/troff/reg.cpp: Don't include symbol.h.

* src/roff/troff/env.cpp: Don't include symbol.h.
(environment::get_glyph_color_string,
environment_get_fill_color_string): New member functions.
(init_env_requests): Handle `.m' and `.M' registers.
* src/roff/troff/input.cpp: Don't include symbol.h.
(default_symbol): Moved to symbol.cpp/symbol.h.
(do_glyph_color, do_fill_color, define_color): Pass symbol name
to color constructor.
* src/roff/troff/env.h: Updated.

* NEWS, man/groff_diff.man, man/groff.man, doc/groff.texinfo:
Document new registers.

3 files changed, 87 insertions, 1 deletions

diff --git a/src/include/Makefile.sub b/src/include/Makefile.sub
index ef9c4648..a0ab6e14 100644
--- a/src/include/Makefile.sub
+++ b/src/include/Makefile.sub
@@ -23,6 +23,7 @@ HDRS=\
   search.h \
   searchpath.h \
   stringclass.h \
+  symbol.h \
   unicode.h
 GENHDRS=defs.h
 
diff --git a/src/include/color.h b/src/include/color.h
index 205f70ef..2a1c62f0 100644
--- a/src/include/color.h
+++ b/src/include/color.h
@@ -24,6 +24,7 @@ with groff; see the file COPYING.  If not, write to the Free Software
 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
 
 #include <stddef.h>
+#include "symbol.h"
 
 enum color_scheme {DEFAULT, CMY, CMYK, RGB, GRAY};
 
@@ -38,8 +39,9 @@ private:
 		    const size_t);
 
 public:
+  symbol nm;
   enum {MAX_COLOR_VAL = 0xffff};
-  color() : scheme(DEFAULT){}
+  color(symbol s = default_symbol) : scheme(DEFAULT), nm(s) {}
   color(const color * const);
   ~color();
   void *operator new(size_t);
diff --git a/src/include/symbol.h b/src/include/symbol.h
new file mode 100644
index 00000000..af4a4c09
--- /dev/null
+++ b/src/include/symbol.h
@@ -0,0 +1,83 @@
+// -*- C++ -*-
+/* Copyright (C) 1989, 1990, 1991, 1992, 2002, 2004
+   Free Software Foundation, Inc.
+     Written by James Clark (jjc@jclark.com)
+
+This file is part of groff.
+
+groff 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, or (at your option) any later
+version.
+
+groff 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 groff; see the file COPYING.  If not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#define DONT_STORE 1
+#define MUST_ALREADY_EXIST 2
+
+class symbol {
+  static const char **table;
+  static int table_used;
+  static int table_size;
+  static char *block;
+  static int block_size;
+  const char *s;
+public:
+  symbol(const char *p, int how = 0);
+  symbol();
+  unsigned long hash() const;
+  int operator ==(symbol) const;
+  int operator !=(symbol) const;
+  const char *contents() const;
+  int is_null() const;
+  int is_empty() const;
+};
+
+
+extern const symbol NULL_SYMBOL;
+extern const symbol EMPTY_SYMBOL;
+
+inline symbol::symbol() : s(0)
+{
+}
+
+inline int symbol::operator==(symbol p) const
+{
+  return s == p.s;
+}
+
+inline int symbol::operator!=(symbol p) const
+{
+  return s != p.s;
+}
+
+inline unsigned long symbol::hash() const
+{
+  return (unsigned long)s;
+}
+
+inline const char *symbol::contents() const
+{
+  return s;
+}
+
+inline int symbol::is_null() const
+{
+  return s == 0;
+}
+
+inline int symbol::is_empty() const
+{
+  return s != 0 && *s == 0;
+}
+
+symbol concat(symbol, symbol);
+
+extern symbol default_symbol;