2 /* Copyright (C) 1989, 1990, 1991, 1992, 2002, 2004
3 Free Software Foundation, Inc.
4 Written by James Clark (jjc@jclark.com)
6 This file is part of groff.
8 groff is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 2, or (at your option) any later
13 groff is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License along
19 with groff; see the file COPYING. If not, write to the Free Software
20 Foundation, 51 Franklin St - Fifth Floor, Boston, MA 02110-1301, USA. */
25 class script_box : public pointer_box {
30 script_box(box *, box *, box *);
32 int compute_metrics(int);
40 /* The idea is that the script should attach to the rightmost box
41 of a list. For example, given `2x sup 3', the superscript should
42 attach to `x' rather than `2x'. */
44 box *make_script_box(box *nuc, box *sub, box *sup)
46 list_box *b = nuc->to_list_box();
48 b->list.p[b->list.len-1] = make_script_box(b->list.p[b->list.len - 1],
54 return new script_box(nuc, sub, sup);
57 script_box::script_box(box *pp, box *qq, box *rr)
58 : pointer_box(pp), sub(qq), sup(rr)
62 script_box::~script_box()
68 int script_box::left_is_italic()
70 return p->left_is_italic();
73 int script_box::compute_metrics(int style)
75 int res = p->compute_metrics(style);
76 p->compute_subscript_kern();
77 printf(".nr " SIZE_FORMAT " \\n[.ps]\n", uid);
78 if (!(style <= SCRIPT_STYLE && one_size_reduction_flag))
80 printf(".nr " SMALL_SIZE_FORMAT " \\n[.ps]\n", uid);
82 sub->compute_metrics(cramped_style(script_style(style)));
84 sup->compute_metrics(script_style(style));
87 printf(".nr " SUP_RAISE_FORMAT " 0\n", uid);
88 printf(".nr " SUB_LOWER_FORMAT " 0\n", uid);
91 printf(".nr " SUP_RAISE_FORMAT " \\n[" HEIGHT_FORMAT "]-%dM>?0\n",
92 uid, p->uid, sup_drop);
93 printf(".nr " SUB_LOWER_FORMAT " \\n[" DEPTH_FORMAT "]+%dM\n",
94 uid, p->uid, sub_drop);
96 printf(".ps \\n[" SIZE_FORMAT "]u\n", uid);
100 printf(".nr " SUB_LOWER_FORMAT " \\n[" SUB_LOWER_FORMAT "]>?%dM>?(\\n["
101 HEIGHT_FORMAT "]-(%dM*4/5))\n",
102 uid, uid, sub1, sub->uid, x_height);
108 if (style == DISPLAY_STYLE)
110 else if (style & 1) // not cramped
114 printf(".nr " SUP_RAISE_FORMAT " \\n[" SUP_RAISE_FORMAT
115 "]>?%dM>?(\\n[" DEPTH_FORMAT "]+(%dM/4))\n",
116 uid, uid, pos, sup->uid, x_height);
119 printf(".nr " SUB_LOWER_FORMAT " \\n[" SUB_LOWER_FORMAT "]>?%dM\n",
122 printf(".nr " TEMP_REG " \\n[" DEPTH_FORMAT "]-\\n["
123 SUP_RAISE_FORMAT "]+\\n[" HEIGHT_FORMAT "]-\\n["
124 SUB_LOWER_FORMAT "]+(4*%dM)\n",
125 sup->uid, uid, sub->uid, uid, default_rule_thickness);
126 printf(".if \\n[" TEMP_REG "] \\{");
127 printf(".nr " SUB_LOWER_FORMAT " +\\n[" TEMP_REG "]\n", uid);
128 printf(".nr " TEMP_REG " (%dM*4/5)-\\n[" SUP_RAISE_FORMAT
129 "]+\\n[" DEPTH_FORMAT "]>?0\n",
130 x_height, uid, sup->uid);
131 printf(".nr " SUP_RAISE_FORMAT " +\\n[" TEMP_REG "]\n", uid);
132 printf(".nr " SUB_LOWER_FORMAT " -\\n[" TEMP_REG "]\n", uid);
136 printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]", uid, p->uid);
137 if (sub != 0 && sup != 0)
138 printf("+((\\n[" WIDTH_FORMAT "]-\\n[" SUB_KERN_FORMAT "]>?\\n["
139 WIDTH_FORMAT "])+%dM)>?0\n",
140 sub->uid, p->uid, sup->uid, script_space);
142 printf("+(\\n[" WIDTH_FORMAT "]-\\n[" SUB_KERN_FORMAT "]+%dM)>?0\n",
143 sub->uid, p->uid, script_space);
145 printf("+(\\n[" WIDTH_FORMAT "]+%dM)>?0\n", sup->uid, script_space);
148 printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]",
151 printf(">?(\\n[" SUP_RAISE_FORMAT "]+\\n[" HEIGHT_FORMAT "])",
154 printf(">?(-\\n[" SUB_LOWER_FORMAT "]+\\n[" HEIGHT_FORMAT "])",
157 printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]",
160 printf(">?(\\n[" SUB_LOWER_FORMAT "]+\\n[" DEPTH_FORMAT "])",
163 printf(">?(-\\n[" SUP_RAISE_FORMAT "]+\\n[" DEPTH_FORMAT "])",
169 void script_box::output()
173 printf("\\Z" DELIMITER_CHAR);
174 printf("\\v'-\\n[" SUP_RAISE_FORMAT "]u'", uid);
175 printf("\\s[\\n[" SMALL_SIZE_FORMAT "]u]", uid);
177 printf("\\s[\\n[" SIZE_FORMAT "]u]", uid);
178 printf(DELIMITER_CHAR);
181 printf("\\Z" DELIMITER_CHAR);
182 printf("\\v'\\n[" SUB_LOWER_FORMAT "]u'", uid);
183 printf("\\s[\\n[" SMALL_SIZE_FORMAT "]u]", uid);
184 printf("\\h'-\\n[" SUB_KERN_FORMAT "]u'", p->uid);
186 printf("\\s[\\n[" SIZE_FORMAT "]u]", uid);
187 printf(DELIMITER_CHAR);
189 printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u'",
193 void script_box::hint(unsigned flags)
195 p->hint(flags & ~HINT_NEXT_IS_ITALIC);
198 void script_box::debug_print()
200 fprintf(stderr, "{ ");
202 fprintf(stderr, " }");
204 fprintf(stderr, " sub { ");
206 fprintf(stderr, " }");
209 fprintf(stderr, " sup { ");
211 fprintf(stderr, " }");
215 void script_box::check_tabs(int level)
218 sup->check_tabs(level + 1);
220 sub->check_tabs(level + 1);
221 p->check_tabs(level);