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Diffstat (limited to 'src/preproc/eqn/over.cpp')
| -rw-r--r-- | src/preproc/eqn/over.cpp | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/preproc/eqn/over.cpp b/src/preproc/eqn/over.cpp new file mode 100644 index 0000000..6a9cd9b --- /dev/null +++ b/src/preproc/eqn/over.cpp @@ -0,0 +1,204 @@ +// -*- 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" + +class over_box : public box { +private: + int reduce_size; + box *num; + box *den; +public: + over_box(int small, box *, box *); + ~over_box(); + void debug_print(); + int compute_metrics(int); + void output(); + void check_tabs(int); +}; + +box *make_over_box(box *pp, box *qq) +{ + return new over_box(0, pp, qq); +} + +box *make_small_over_box(box *pp, box *qq) +{ + return new over_box(1, pp, qq); +} + +over_box::over_box(int is_small, box *pp, box *qq) +: reduce_size(is_small), num(pp), den(qq) +{ + spacing_type = INNER_TYPE; +} + +over_box::~over_box() +{ + delete num; + delete den; +} + +int over_box::compute_metrics(int style) +{ + if (reduce_size) { + style = script_style(style); + printf(".nr " SIZE_FORMAT " \\n[.ps]\n", uid); + set_script_size(); + printf(".nr " SMALL_SIZE_FORMAT " \\n[.ps]\n", uid); + } + int mark_uid = 0; + int res = num->compute_metrics(style); + if (res) + mark_uid = num->uid; + int r = den->compute_metrics(cramped_style(style)); + if (r && res) + error("multiple marks and lineups"); + else { + mark_uid = den->uid; + res = r; + } + if (reduce_size) + printf(".ps \\n[" SIZE_FORMAT "]u\n", uid); + printf(".nr " WIDTH_FORMAT " (\\n[" WIDTH_FORMAT "]>?\\n[" WIDTH_FORMAT "]", + uid, num->uid, den->uid); + // allow for \(ru being wider than both the numerator and denominator + if (!draw_flag) + fputs(">?\\w" DELIMITER_CHAR "\\(ru" DELIMITER_CHAR, stdout); + printf(")+%dM\n", null_delimiter_space*2 + over_hang*2); + // 15b + printf(".nr " SUP_RAISE_FORMAT " %dM\n", + uid, (reduce_size ? num2 : num1)); + printf(".nr " SUB_LOWER_FORMAT " %dM\n", + uid, (reduce_size ? denom2 : denom1)); + + // 15d + printf(".nr " SUP_RAISE_FORMAT " +(\\n[" DEPTH_FORMAT + "]-\\n[" SUP_RAISE_FORMAT "]+%dM+(%dM/2)+%dM)>?0\n", + uid, num->uid, uid, axis_height, default_rule_thickness, + default_rule_thickness*(reduce_size ? 1 : 3)); + printf(".nr " SUB_LOWER_FORMAT " +(\\n[" HEIGHT_FORMAT + "]-\\n[" SUB_LOWER_FORMAT "]-%dM+(%dM/2)+%dM)>?0\n", + uid, den->uid, uid, axis_height, default_rule_thickness, + default_rule_thickness*(reduce_size ? 1 : 3)); + + + printf(".nr " HEIGHT_FORMAT " \\n[" SUP_RAISE_FORMAT "]+\\n[" + HEIGHT_FORMAT "]\n", + uid, uid, num->uid); + printf(".nr " DEPTH_FORMAT " \\n[" SUB_LOWER_FORMAT "]+\\n[" + DEPTH_FORMAT "]\n", + uid, uid, den->uid); + if (res) + printf(".nr " MARK_REG " +(\\n[" WIDTH_FORMAT "]-\\n[" + WIDTH_FORMAT "]/2)\n", uid, mark_uid); + return res; +} + +#define USE_Z + +void over_box::output() +{ + if (output_format == troff) { + if (reduce_size) + printf("\\s[\\n[" SMALL_SIZE_FORMAT "]u]", uid); + #ifdef USE_Z + printf("\\Z" DELIMITER_CHAR); + #endif + // move up to the numerator baseline + printf("\\v'-\\n[" SUP_RAISE_FORMAT "]u'", uid); + // move across so that it's centered + printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u'", + uid, num->uid); + + // print the numerator + num->output(); + + #ifdef USE_Z + printf(DELIMITER_CHAR); + #else + // back again + printf("\\h'-\\n[" WIDTH_FORMAT "]u'", num->uid); + printf("\\h'-(\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u)'", + uid, num->uid); + // down again + printf("\\v'\\n[" SUP_RAISE_FORMAT "]u'", uid); + #endif + #ifdef USE_Z + printf("\\Z" DELIMITER_CHAR); + #endif + // move down to the denominator baseline + printf("\\v'\\n[" SUB_LOWER_FORMAT "]u'", uid); + + // move across so that it's centered + printf("\\h'\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u'", + uid, den->uid); + + // print the denominator + den->output(); + + #ifdef USE_Z + printf(DELIMITER_CHAR); + #else + // back again + printf("\\h'-\\n[" WIDTH_FORMAT "]u'", den->uid); + printf("\\h'-(\\n[" WIDTH_FORMAT "]u-\\n[" WIDTH_FORMAT "]u/2u)'", + uid, den->uid); + // up again + printf("\\v'-\\n[" SUB_LOWER_FORMAT "]u'", uid); + #endif + if (reduce_size) + printf("\\s[\\n[" SIZE_FORMAT "]u]", uid); + // draw the line + printf("\\h'%dM'", null_delimiter_space); + printf("\\v'-%dM'", axis_height); + fputs(draw_flag ? "\\D'l" : "\\l'", stdout); + printf("\\n[" WIDTH_FORMAT "]u-%dM", + uid, 2*null_delimiter_space); + fputs(draw_flag ? " 0'" : "\\&\\(ru'", stdout); + printf("\\v'%dM'", axis_height); + printf("\\h'%dM'", null_delimiter_space); + } + else if (output_format == mathml) { + // FIXME: passing a displaystyle attribute doesn't validate. + printf("<mfrac>"); + num->output(); + den->output(); + printf("</mfrac>"); + } +} + +void over_box::debug_print() +{ + fprintf(stderr, "{ "); + num->debug_print(); + if (reduce_size) + fprintf(stderr, " } smallover { "); + else + fprintf(stderr, " } over { "); + den->debug_print(); + fprintf(stderr, " }"); +} + +void over_box::check_tabs(int level) +{ + num->check_tabs(level + 1); + den->check_tabs(level + 1); +} |