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- // -*- C++ -*-
- /* Copyright (C) 1989, 1990, 1991, 1992 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- #include "eqn.h"
- #include "pbox.h"
-
- class limit_box : public box {
- private:
- box *p;
- box *from;
- box *to;
- public:
- limit_box(box *, box *, box *);
- ~limit_box();
- int compute_metrics(int);
- void output();
- void debug_print();
- void check_tabs(int);
- };
-
- box *make_limit_box(box *pp, box *qq, box *rr)
- {
- return new limit_box(pp, qq, rr);
- }
-
- limit_box::limit_box(box *pp, box *qq, box *rr)
- : p(pp), from(qq), to(rr)
- {
- spacing_type = p->spacing_type;
- }
-
- limit_box::~limit_box()
- {
- delete p;
- delete from;
- delete to;
- }
-
- int limit_box::compute_metrics(int style)
- {
- printf(".nr " SIZE_FORMAT " \\n[.s]\n", uid);
- if (!(style <= SCRIPT_STYLE && one_size_reduction_flag))
- set_script_size();
- printf(".nr " SMALL_SIZE_FORMAT " \\n[.s]\n", uid);
- int res = 0;
- int mark_uid = -1;
- if (from != 0) {
- res = from->compute_metrics(cramped_style(script_style(style)));
- if (res)
- mark_uid = from->uid;
- }
- if (to != 0) {
- int r = to->compute_metrics(script_style(style));
- if (res && r)
- error("multiple marks and lineups");
- else {
- mark_uid = to->uid;
- res = r;
- }
- }
- printf(".ps \\n[" SIZE_FORMAT "]\n", uid);
- int r = p->compute_metrics(style);
- p->compute_subscript_kern();
- if (res && r)
- error("multiple marks and lineups");
- else {
- mark_uid = p->uid;
- res = r;
- }
- printf(".nr " LEFT_WIDTH_FORMAT " "
- "0\\n[" WIDTH_FORMAT "]",
- uid, p->uid);
- if (from != 0)
- printf(">?(\\n[" SUB_KERN_FORMAT "]+\\n[" WIDTH_FORMAT "])",
- p->uid, from->uid);
- if (to != 0)
- printf(">?(-\\n[" SUB_KERN_FORMAT "]+\\n[" WIDTH_FORMAT "])",
- p->uid, to->uid);
- printf("/2\n");
- printf(".nr " WIDTH_FORMAT " "
- "0\\n[" WIDTH_FORMAT "]",
- uid, p->uid);
- if (from != 0)
- printf(">?(-\\n[" SUB_KERN_FORMAT "]+\\n[" WIDTH_FORMAT "])",
- p->uid, from->uid);
- if (to != 0)
- printf(">?(\\n[" SUB_KERN_FORMAT "]+\\n[" WIDTH_FORMAT "])",
- p->uid, to->uid);
- printf("/2+\\n[" LEFT_WIDTH_FORMAT "]\n", uid);
- printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]", uid, p->uid);
- if (to != 0)
- printf(">?\\n[" WIDTH_FORMAT "]", to->uid);
- if (from != 0)
- printf(">?\\n[" WIDTH_FORMAT "]", from->uid);
- printf("\n");
- if (res)
- printf(".nr " MARK_REG " +(\\n[" LEFT_WIDTH_FORMAT "]"
- "-(\\n[" WIDTH_FORMAT "]/2))\n",
- uid, mark_uid);
- if (to != 0) {
- printf(".nr " SUP_RAISE_FORMAT " %dM+\\n[" DEPTH_FORMAT
- "]>?%dM+\\n[" HEIGHT_FORMAT "]\n",
- uid, big_op_spacing1, to->uid, big_op_spacing3, p->uid);
- printf(".nr " HEIGHT_FORMAT " \\n[" SUP_RAISE_FORMAT "]+\\n["
- HEIGHT_FORMAT "]+%dM\n",
- uid, uid, to->uid, big_op_spacing5);
- }
- else
- printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]\n", uid, p->uid);
- if (from != 0) {
- printf(".nr " SUB_LOWER_FORMAT " %dM+\\n[" HEIGHT_FORMAT
- "]>?%dM+\\n[" DEPTH_FORMAT "]\n",
- uid, big_op_spacing2, from->uid, big_op_spacing4, p->uid);
- printf(".nr " DEPTH_FORMAT " \\n[" SUB_LOWER_FORMAT "]+\\n["
- DEPTH_FORMAT "]+%dM\n",
- uid, uid, from->uid, big_op_spacing5);
- }
- else
- printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]\n", uid, p->uid);
- return res;
- }
-
- void limit_box::output()
- {
- printf("\\s[\\n[" SMALL_SIZE_FORMAT "]]", uid);
- if (to != 0) {
- printf("\\Z" DELIMITER_CHAR);
- printf("\\v'-\\n[" SUP_RAISE_FORMAT "]u'", uid);
- printf("\\h'\\n[" LEFT_WIDTH_FORMAT "]u"
- "+(-\\n[" WIDTH_FORMAT "]u+\\n[" SUB_KERN_FORMAT "]u/2u)'",
- uid, to->uid, p->uid);
- to->output();
- printf(DELIMITER_CHAR);
- }
- if (from != 0) {
- printf("\\Z" DELIMITER_CHAR);
- printf("\\v'\\n[" SUB_LOWER_FORMAT "]u'", uid);
- printf("\\h'\\n[" LEFT_WIDTH_FORMAT "]u"
- "+(-\\n[" SUB_KERN_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u)'",
- uid, p->uid, from->uid);
- from->output();
- printf(DELIMITER_CHAR);
- }
- printf("\\s[\\n[" SIZE_FORMAT "]]", uid);
- printf("\\Z" DELIMITER_CHAR);
- printf("\\h'\\n[" LEFT_WIDTH_FORMAT "]u"
- "-(\\n[" WIDTH_FORMAT "]u/2u)'",
- uid, p->uid);
- p->output();
- printf(DELIMITER_CHAR);
- printf("\\h'\\n[" WIDTH_FORMAT "]u'", uid);
- }
-
- void limit_box::debug_print()
- {
- fprintf(stderr, "{ ");
- p->debug_print();
- fprintf(stderr, " }");
- if (from) {
- fprintf(stderr, " from { ");
- from->debug_print();
- fprintf(stderr, " }");
- }
- if (to) {
- fprintf(stderr, " to { ");
- to->debug_print();
- fprintf(stderr, " }");
- }
- }
-
- void limit_box::check_tabs(int level)
- {
- if (to)
- to->check_tabs(level + 1);
- if (from)
- from->check_tabs(level + 1);
- p->check_tabs(level + 1);
- }
-