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-rw-r--r--src/preproc/eqn/script.cpp250
1 files changed, 250 insertions, 0 deletions
diff --git a/src/preproc/eqn/script.cpp b/src/preproc/eqn/script.cpp
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+++ 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:
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 17:35:45 +0000