Adding upstream version 1.23.0.upstream/1.23.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 250 insertions, 0 deletions

diff --git a/src/preproc/eqn/script.cpp b/src/preproc/eqn/script.cpp
new file mode 100644
index 0000000..f485eb9
--- /dev/null
+++ b/src/preproc/eqn/script.cpp
@@ -0,0 +1,250 @@
+/* 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 <assert.h>
+
+#include "eqn.h"
+#include "pbox.h"
+
+class script_box : public pointer_box {
+private:
+  box *sub;
+  box *sup;
+public:
+  script_box(box *, box *, box *);
+  ~script_box();
+  int compute_metrics(int);
+  void output();
+  void debug_print();
+  int left_is_italic();
+  void hint(unsigned);
+  void check_tabs(int);
+};
+
+/* The idea is that the script should attach to the rightmost box
+of a list. For example, given '2x sup 3', the superscript should
+attach to 'x' rather than '2x'. */
+
+box *make_script_box(box *nuc, box *sub, box *sup)
+{
+  list_box *b = nuc->to_list_box();
+  if (b != 0) {
+    b->list.p[b->list.len-1] = make_script_box(b->list.p[b->list.len - 1],
+					       sub,
+					       sup);
+    return b;
+  }
+  else
+    return new script_box(nuc, sub, sup);
+}
+
+script_box::script_box(box *pp, box *qq, box *rr)
+: pointer_box(pp), sub(qq), sup(rr)
+{
+}
+
+script_box::~script_box()
+{
+  delete sub;
+  delete sup;
+}
+
+int script_box::left_is_italic()
+{
+  return p->left_is_italic();
+}
+
+int script_box::compute_metrics(int style)
+{
+  int res = p->compute_metrics(style);
+  p->compute_subscript_kern();
+  printf(".nr " SIZE_FORMAT " \\n[.ps]\n", uid);
+  if (!(style <= SCRIPT_STYLE && one_size_reduction_flag))
+    set_script_size();
+  printf(".nr " SMALL_SIZE_FORMAT " \\n[.ps]\n", uid);
+  if (sub != 0)
+    sub->compute_metrics(cramped_style(script_style(style)));
+  if (sup != 0)
+    sup->compute_metrics(script_style(style));
+  // 18a
+  if (p->is_char()) {
+    printf(".nr " SUP_RAISE_FORMAT " 0\n", uid);
+    printf(".nr " SUB_LOWER_FORMAT " 0\n", uid);
+  }
+  else {
+    printf(".nr " SUP_RAISE_FORMAT " \\n[" HEIGHT_FORMAT "]-%dM>?0\n",
+	   uid, p->uid, sup_drop);
+    printf(".nr " SUB_LOWER_FORMAT " \\n[" DEPTH_FORMAT "]+%dM\n",
+	   uid, p->uid, sub_drop);
+  }
+  printf(".ps \\n[" SIZE_FORMAT "]u\n", uid);
+  if (sup == 0) {
+    assert(sub != 0);
+    // 18b
+    printf(".nr " SUB_LOWER_FORMAT " \\n[" SUB_LOWER_FORMAT "]>?%dM>?(\\n["
+	   HEIGHT_FORMAT "]-(%dM*4/5))\n",
+	   uid, uid, sub1, sub->uid, x_height);
+  }
+  else {
+    // sup != 0
+    // 18c
+    int pos;
+    if (style == DISPLAY_STYLE)
+      pos = sup1;
+    else if (style & 1)		// not cramped
+      pos = sup2;
+    else
+      pos = sup3;
+    printf(".nr " SUP_RAISE_FORMAT " \\n[" SUP_RAISE_FORMAT
+	   "]>?%dM>?(\\n[" DEPTH_FORMAT "]+(%dM/4))\n",
+	   uid, uid, pos, sup->uid, x_height);
+    // 18d
+    if (sub != 0) {
+      printf(".nr " SUB_LOWER_FORMAT " \\n[" SUB_LOWER_FORMAT "]>?%dM\n",
+	     uid, uid, sub2);
+      // 18e
+      printf(".nr " TEMP_REG " \\n[" DEPTH_FORMAT "]-\\n["
+	     SUP_RAISE_FORMAT "]+\\n[" HEIGHT_FORMAT "]-\\n["
+	     SUB_LOWER_FORMAT "]+(4*%dM)\n",
+	     sup->uid, uid, sub->uid, uid, default_rule_thickness);
+      printf(".if \\n[" TEMP_REG "] \\{");
+      printf(".nr " SUB_LOWER_FORMAT " +\\n[" TEMP_REG "]\n", uid);
+      printf(".nr " TEMP_REG " (%dM*4/5)-\\n[" SUP_RAISE_FORMAT
+	     "]+\\n[" DEPTH_FORMAT "]>?0\n",
+	     x_height, uid, sup->uid);
+      printf(".nr " SUP_RAISE_FORMAT " +\\n[" TEMP_REG "]\n", uid);
+      printf(".nr " SUB_LOWER_FORMAT " -\\n[" TEMP_REG "]\n", uid);
+      printf(".\\}\n");
+    }
+  }
+  printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]", uid, p->uid);
+  if (sub != 0 && sup != 0)
+    printf("+((\\n[" WIDTH_FORMAT "]-\\n[" SUB_KERN_FORMAT "]>?\\n["
+	   WIDTH_FORMAT "])+%dM)>?0\n",
+	   sub->uid, p->uid, sup->uid, script_space);
+  else if (sub != 0)
+    printf("+(\\n[" WIDTH_FORMAT "]-\\n[" SUB_KERN_FORMAT "]+%dM)>?0\n",
+	   sub->uid, p->uid, script_space);
+  else if (sup != 0)
+    printf("+(\\n[" WIDTH_FORMAT "]+%dM)>?0\n", sup->uid, script_space);
+  else
+    printf("\n");
+  printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]",
+	 uid, p->uid);
+  if (sup != 0)
+    printf(">?(\\n[" SUP_RAISE_FORMAT "]+\\n[" HEIGHT_FORMAT "])",
+	   uid, sup->uid);
+  if (sub != 0)
+    printf(">?(-\\n[" SUB_LOWER_FORMAT "]+\\n[" HEIGHT_FORMAT "])",
+	   uid, sub->uid);
+  printf("\n");
+  printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]",
+	 uid, p->uid);
+  if (sub != 0)
+    printf(">?(\\n[" SUB_LOWER_FORMAT "]+\\n[" DEPTH_FORMAT "])",
+	   uid, sub->uid);
+  if (sup != 0)
+    printf(">?(-\\n[" SUP_RAISE_FORMAT "]+\\n[" DEPTH_FORMAT "])",
+	   uid, sup->uid);
+  printf("\n");
+  return res;
+}
+
+void script_box::output()
+{
+  if (output_format == troff) {
+    p->output();
+    if (sup != 0) {
+      printf("\\Z" DELIMITER_CHAR);
+      printf("\\v'-\\n[" SUP_RAISE_FORMAT "]u'", uid);
+      printf("\\s[\\n[" SMALL_SIZE_FORMAT "]u]", uid);
+      sup->output();
+      printf("\\s[\\n[" SIZE_FORMAT "]u]", uid);
+      printf(DELIMITER_CHAR);
+    }
+    if (sub != 0) {
+      printf("\\Z" DELIMITER_CHAR);
+      printf("\\v'\\n[" SUB_LOWER_FORMAT "]u'", uid);
+      printf("\\s[\\n[" SMALL_SIZE_FORMAT "]u]", uid);
+      printf("\\h'-\\n[" SUB_KERN_FORMAT "]u'", p->uid);
+      sub->output();
+      printf("\\s[\\n[" SIZE_FORMAT "]u]", uid);
+      printf(DELIMITER_CHAR);
+    }
+    printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u'",
+	   uid, p->uid);
+  }
+  else if (output_format == mathml) {
+    if (sup != 0 && sub != 0) {
+      printf("<msubsup>");
+      p->output();
+      sub->output();
+      sup->output();
+      printf("</msubsup>");
+    }
+    else if (sup != 0) {
+      printf("<msup>");
+      p->output();
+      sup->output();
+      printf("</msup>");
+  }
+  else if (sub != 0) {
+      printf("<msub>");
+      p->output();
+      sub->output();
+      printf("</msub>");
+    }
+  }
+}
+
+void script_box::hint(unsigned flags)
+{
+  p->hint(flags & ~HINT_NEXT_IS_ITALIC);
+}
+
+void script_box::debug_print()
+{
+  fprintf(stderr, "{ ");
+  p->debug_print();
+  fprintf(stderr, " }");
+  if (sub) {
+    fprintf(stderr, " sub { ");
+    sub->debug_print();
+    fprintf(stderr, " }");
+  }
+  if (sup) {
+    fprintf(stderr, " sup { ");
+    sup->debug_print();
+    fprintf(stderr, " }");
+  }
+}
+
+void script_box::check_tabs(int level)
+{
+  if (sup)
+    sup->check_tabs(level + 1);
+  if (sub)
+    sub->check_tabs(level + 1);
+  p->check_tabs(level);
+}
+
+// Local Variables:
+// fill-column: 72
+// mode: C++
+// End:
+// vim: set cindent noexpandtab shiftwidth=2 textwidth=72: