2 /* Copyright (C) 1989, 1990, 1991, 1992, 2002, 2004, 2007, 2008, 2009
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 3 of the License, or
11 (at your option) any later version.
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
19 along with this program. If not, see <http://www.gnu.org/licenses/>. */
24 class script_box : public pointer_box {
29 script_box(box *, box *, box *);
31 int compute_metrics(int);
39 /* The idea is that the script should attach to the rightmost box
40 of a list. For example, given `2x sup 3', the superscript should
41 attach to `x' rather than `2x'. */
43 box *make_script_box(box *nuc, box *sub, box *sup)
45 list_box *b = nuc->to_list_box();
47 b->list.p[b->list.len-1] = make_script_box(b->list.p[b->list.len - 1],
53 return new script_box(nuc, sub, sup);
56 script_box::script_box(box *pp, box *qq, box *rr)
57 : pointer_box(pp), sub(qq), sup(rr)
61 script_box::~script_box()
67 int script_box::left_is_italic()
69 return p->left_is_italic();
72 int script_box::compute_metrics(int style)
74 int res = p->compute_metrics(style);
75 p->compute_subscript_kern();
76 printf(".nr " SIZE_FORMAT " \\n[.ps]\n", uid);
77 if (!(style <= SCRIPT_STYLE && one_size_reduction_flag))
79 printf(".nr " SMALL_SIZE_FORMAT " \\n[.ps]\n", uid);
81 sub->compute_metrics(cramped_style(script_style(style)));
83 sup->compute_metrics(script_style(style));
86 printf(".nr " SUP_RAISE_FORMAT " 0\n", uid);
87 printf(".nr " SUB_LOWER_FORMAT " 0\n", uid);
90 printf(".nr " SUP_RAISE_FORMAT " \\n[" HEIGHT_FORMAT "]-%dM>?0\n",
91 uid, p->uid, sup_drop);
92 printf(".nr " SUB_LOWER_FORMAT " \\n[" DEPTH_FORMAT "]+%dM\n",
93 uid, p->uid, sub_drop);
95 printf(".ps \\n[" SIZE_FORMAT "]u\n", uid);
99 printf(".nr " SUB_LOWER_FORMAT " \\n[" SUB_LOWER_FORMAT "]>?%dM>?(\\n["
100 HEIGHT_FORMAT "]-(%dM*4/5))\n",
101 uid, uid, sub1, sub->uid, x_height);
107 if (style == DISPLAY_STYLE)
109 else if (style & 1) // not cramped
113 printf(".nr " SUP_RAISE_FORMAT " \\n[" SUP_RAISE_FORMAT
114 "]>?%dM>?(\\n[" DEPTH_FORMAT "]+(%dM/4))\n",
115 uid, uid, pos, sup->uid, x_height);
118 printf(".nr " SUB_LOWER_FORMAT " \\n[" SUB_LOWER_FORMAT "]>?%dM\n",
121 printf(".nr " TEMP_REG " \\n[" DEPTH_FORMAT "]-\\n["
122 SUP_RAISE_FORMAT "]+\\n[" HEIGHT_FORMAT "]-\\n["
123 SUB_LOWER_FORMAT "]+(4*%dM)\n",
124 sup->uid, uid, sub->uid, uid, default_rule_thickness);
125 printf(".if \\n[" TEMP_REG "] \\{");
126 printf(".nr " SUB_LOWER_FORMAT " +\\n[" TEMP_REG "]\n", uid);
127 printf(".nr " TEMP_REG " (%dM*4/5)-\\n[" SUP_RAISE_FORMAT
128 "]+\\n[" DEPTH_FORMAT "]>?0\n",
129 x_height, uid, sup->uid);
130 printf(".nr " SUP_RAISE_FORMAT " +\\n[" TEMP_REG "]\n", uid);
131 printf(".nr " SUB_LOWER_FORMAT " -\\n[" TEMP_REG "]\n", uid);
135 printf(".nr " WIDTH_FORMAT " 0\\n[" WIDTH_FORMAT "]", uid, p->uid);
136 if (sub != 0 && sup != 0)
137 printf("+((\\n[" WIDTH_FORMAT "]-\\n[" SUB_KERN_FORMAT "]>?\\n["
138 WIDTH_FORMAT "])+%dM)>?0\n",
139 sub->uid, p->uid, sup->uid, script_space);
141 printf("+(\\n[" WIDTH_FORMAT "]-\\n[" SUB_KERN_FORMAT "]+%dM)>?0\n",
142 sub->uid, p->uid, script_space);
144 printf("+(\\n[" WIDTH_FORMAT "]+%dM)>?0\n", sup->uid, script_space);
147 printf(".nr " HEIGHT_FORMAT " \\n[" HEIGHT_FORMAT "]",
150 printf(">?(\\n[" SUP_RAISE_FORMAT "]+\\n[" HEIGHT_FORMAT "])",
153 printf(">?(-\\n[" SUB_LOWER_FORMAT "]+\\n[" HEIGHT_FORMAT "])",
156 printf(".nr " DEPTH_FORMAT " \\n[" DEPTH_FORMAT "]",
159 printf(">?(\\n[" SUB_LOWER_FORMAT "]+\\n[" DEPTH_FORMAT "])",
162 printf(">?(-\\n[" SUP_RAISE_FORMAT "]+\\n[" DEPTH_FORMAT "])",
168 void script_box::output()
170 if (output_format == troff) {
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'",
192 else if (output_format == mathml) {
193 if (sup != 0 && sub != 0) {
198 printf("</msubsup>");
215 void script_box::hint(unsigned flags)
217 p->hint(flags & ~HINT_NEXT_IS_ITALIC);
220 void script_box::debug_print()
222 fprintf(stderr, "{ ");
224 fprintf(stderr, " }");
226 fprintf(stderr, " sub { ");
228 fprintf(stderr, " }");
231 fprintf(stderr, " sup { ");
233 fprintf(stderr, " }");
237 void script_box::check_tabs(int level)
240 sup->check_tabs(level + 1);
242 sub->check_tabs(level + 1);
243 p->check_tabs(level);