diff options
Diffstat (limited to 'src/preproc/eqn/list.cpp')
| -rw-r--r-- | src/preproc/eqn/list.cpp | 241 |
1 files changed, 241 insertions, 0 deletions
diff --git a/src/preproc/eqn/list.cpp b/src/preproc/eqn/list.cpp new file mode 100644 index 0000000..52644c5 --- /dev/null +++ b/src/preproc/eqn/list.cpp @@ -0,0 +1,241 @@ +// -*- C++ -*- +/* 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 "eqn.h" +#include "pbox.h" + +list_box *box::to_list_box() +{ + return 0; +} + +list_box *list_box::to_list_box() +{ + return this; +} + +void list_box::append(box *pp) +{ + list_box *q = pp->to_list_box(); + if (q == 0) + list.append(pp); + else { + for (int i = 0; i < q->list.len; i++) { + list.append(q->list.p[i]); + q->list.p[i] = 0; + } + q->list.len = 0; + delete q; + } +} + +list_box::list_box(box *pp) : list(pp), sty(-1) +{ + list_box *q = pp->to_list_box(); + if (q != 0) { + // flatten it + list.p[0] = q->list.p[0]; + for (int i = 1; i < q->list.len; i++) { + list.append(q->list.p[i]); + q->list.p[i] = 0; + } + q->list.len = 0; + delete q; + } +} + +static int compute_spacing(int is_script, int left, int right) +{ + if (left == SUPPRESS_TYPE || right == SUPPRESS_TYPE) + return 0; + if (left == PUNCTUATION_TYPE) + return is_script ? 0 : thin_space; + if (left == OPENING_TYPE || right == CLOSING_TYPE) + return 0; + if (right == BINARY_TYPE || left == BINARY_TYPE) + return is_script ? 0 : medium_space; + if (right == RELATION_TYPE) { + if (left == RELATION_TYPE) + return 0; + else + return is_script ? 0 : thick_space; + } + if (left == RELATION_TYPE) + return is_script ? 0 : thick_space; + if (right == OPERATOR_TYPE) + return thin_space; + if (left == INNER_TYPE || right == INNER_TYPE) + return is_script ? 0 : thin_space; + if (left == OPERATOR_TYPE && right == ORDINARY_TYPE) + return thin_space; + return 0; +} + +int list_box::compute_metrics(int style) +{ + sty = style; + int i; + for (i = 0; i < list.len; i++) { + int t = list.p[i]->spacing_type; + // 5 + if (t == BINARY_TYPE) { + int prevt; + if (i == 0 + || (prevt = list.p[i-1]->spacing_type) == BINARY_TYPE + || prevt == OPERATOR_TYPE + || prevt == RELATION_TYPE + || prevt == OPENING_TYPE + || prevt == SUPPRESS_TYPE + || prevt == PUNCTUATION_TYPE) + list.p[i]->spacing_type = ORDINARY_TYPE; + } + // 7 + else if ((t == RELATION_TYPE || t == CLOSING_TYPE + || t == PUNCTUATION_TYPE) + && i > 0 && list.p[i-1]->spacing_type == BINARY_TYPE) + list.p[i-1]->spacing_type = ORDINARY_TYPE; + } + for (i = 0; i < list.len; i++) { + unsigned flags = 0; + if (i - 1 >= 0 && list.p[i - 1]->right_is_italic()) + flags |= HINT_PREV_IS_ITALIC; + if (i + 1 < list.len && list.p[i + 1]->left_is_italic()) + flags |= HINT_NEXT_IS_ITALIC; + if (flags) + list.p[i]->hint(flags); + } + is_script = (style <= SCRIPT_STYLE); + int total_spacing = 0; + for (i = 1; i < list.len; i++) + total_spacing += compute_spacing(is_script, list.p[i-1]->spacing_type, + list.p[i]->spacing_type); + int res = 0; + for (i = 0; i < list.len; i++) + if (!list.p[i]->is_simple()) { + int r = list.p[i]->compute_metrics(style); + if (r) { + if (res) + error("multiple marks and lineups"); + else { + compute_sublist_width(i); + printf(".nr " MARK_REG " +\\n[" TEMP_REG"]\n"); + res = r; + } + } + } + printf(".nr " WIDTH_FORMAT " %dM", uid, total_spacing); + for (i = 0; i < list.len; i++) + if (!list.p[i]->is_simple()) + printf("+\\n[" WIDTH_FORMAT "]", list.p[i]->uid); + printf("\n"); + printf(".nr " HEIGHT_FORMAT " 0", uid); + for (i = 0; i < list.len; i++) + if (!list.p[i]->is_simple()) + printf(">?\\n[" HEIGHT_FORMAT "]", list.p[i]->uid); + printf("\n"); + printf(".nr " DEPTH_FORMAT " 0", uid); + for (i = 0; i < list.len; i++) + if (!list.p[i]->is_simple()) + printf(">?\\n[" DEPTH_FORMAT "]", list.p[i]->uid); + printf("\n"); + int have_simple = 0; + for (i = 0; i < list.len && !have_simple; i++) + have_simple = list.p[i]->is_simple(); + if (have_simple) { + printf(".nr " WIDTH_FORMAT " +\\w" DELIMITER_CHAR, uid); + for (i = 0; i < list.len; i++) + if (list.p[i]->is_simple()) + list.p[i]->output(); + printf(DELIMITER_CHAR "\n"); + printf(".nr " HEIGHT_FORMAT " \\n[rst]>?\\n[" HEIGHT_FORMAT "]\n", + uid, uid); + printf(".nr " DEPTH_FORMAT " 0-\\n[rsb]>?\\n[" DEPTH_FORMAT "]\n", + uid, uid); + } + return res; +} + +void list_box::compute_sublist_width(int n) +{ + int total_spacing = 0; + int i; + for (i = 1; i < n + 1 && i < list.len; i++) + total_spacing += compute_spacing(is_script, list.p[i-1]->spacing_type, + list.p[i]->spacing_type); + printf(".nr " TEMP_REG " %dM", total_spacing); + for (i = 0; i < n; i++) + if (!list.p[i]->is_simple()) + printf("+\\n[" WIDTH_FORMAT "]", list.p[i]->uid); + int have_simple = 0; + for (i = 0; i < n && !have_simple; i++) + have_simple = list.p[i]->is_simple(); + if (have_simple) { + printf("+\\w" DELIMITER_CHAR); + for (i = 0; i < n; i++) + if (list.p[i]->is_simple()) + list.p[i]->output(); + printf(DELIMITER_CHAR); + } + printf("\n"); +} + +void list_box::compute_subscript_kern() +{ + // We can only call compute_subscript_kern if we have called + // compute_metrics first. + if (list.p[list.len-1]->is_simple()) + list.p[list.len-1]->compute_metrics(sty); + list.p[list.len-1]->compute_subscript_kern(); + printf(".nr " SUB_KERN_FORMAT " \\n[" SUB_KERN_FORMAT "]\n", + uid, list.p[list.len-1]->uid); +} + +void list_box::output() +{ + if (output_format == mathml) + printf("<mrow>"); + for (int i = 0; i < list.len; i++) { + if (output_format == troff && i > 0) { + int n = compute_spacing(is_script, + list.p[i-1]->spacing_type, + list.p[i]->spacing_type); + if (n > 0) + printf("\\h'%dM'", n); + } + list.p[i]->output(); + } + if (output_format == mathml) + printf("</mrow>"); +} + +void list_box::handle_char_type(int st, int ft) +{ + for (int i = 0; i < list.len; i++) + list.p[i]->handle_char_type(st, ft); +} + +void list_box::debug_print() +{ + list.list_debug_print(" "); +} + +void list_box::check_tabs(int level) +{ + list.list_check_tabs(level); +} |