1 files changed, 120 insertions, 0 deletions
diff --git a/src/preproc/eqn/mark.cpp b/src/preproc/eqn/mark.cpp
new file mode 100644
index 0000000..9427b10
--- /dev/null
+++ b/src/preproc/eqn/mark.cpp
@@ -0,0 +1,120 @@
+// -*- C++ -*-
+/* Copyright (C) 1989-2020 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 3 of the License, 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 this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+#include "eqn.h"
+#include "pbox.h"
+
+class mark_box : public pointer_box {
+public:
+  mark_box(box *);
+  int compute_metrics(int);
+  void output();
+  void debug_print();
+};
+
+// we push down marks so that they don't interfere with spacing
+
+box *make_mark_box(box *p)
+{
+  list_box *b = p->to_list_box();
+  if (b != 0) {
+    b->list.p[0] = make_mark_box(b->list.p[0]);
+    return b;
+  }
+  else
+    return new mark_box(p);
+}
+
+mark_box::mark_box(box *pp) : pointer_box(pp)
+{
+}
+
+void mark_box::output()
+{
+  p->output();
+}
+
+int mark_box::compute_metrics(int style)
+{
+  int res = p->compute_metrics(style);
+  if (res)
+    error("multiple marks and lineups");
+  printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]\n", uid, p->uid);
+  printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]\n", uid, p->uid);
+  printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]\n", uid, p->uid);
+  printf(".nr " MARK_REG " 0\n");
+  return FOUND_MARK;
+}
+
+void mark_box::debug_print()
+{
+  fprintf(stderr, "mark { ");
+  p->debug_print();
+  fprintf(stderr, " }");
+}
+
+
+class lineup_box : public pointer_box {
+public:
+  lineup_box(box *);
+  void output();
+  int compute_metrics(int style);
+  void debug_print();
+};
+
+// we push down lineups so that they don't interfere with spacing
+
+box *make_lineup_box(box *p)
+{
+  list_box *b = p->to_list_box();
+  if (b != 0) {
+    b->list.p[0] = make_lineup_box(b->list.p[0]);
+    return b;
+  }
+  else
+    return new lineup_box(p);
+}
+
+lineup_box::lineup_box(box *pp) : pointer_box(pp)
+{
+}
+
+void lineup_box::output()
+{
+  p->output();
+}
+
+int lineup_box::compute_metrics(int style)
+{
+  int res = p->compute_metrics(style);
+  if (res)
+    error("multiple marks and lineups");
+  printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]\n", uid, p->uid);
+  printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]\n", uid, p->uid);
+  printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]\n", uid, p->uid);
+  printf(".nr " MARK_REG " 0\n");
+  return FOUND_LINEUP;
+}
+
+void lineup_box::debug_print()
+{
+  fprintf(stderr, "lineup { ");
+  p->debug_print();
+  fprintf(stderr, " }");
+}