contrib/mdocml/eqn_html.c

   1 /*      $Id: eqn_html.c,v 1.11 2017/01/17 01:47:51 schwarze Exp $ */
   2 /*
   3  * Copyright (c) 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
   4  * Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18 #include "config.h"
  19
  20 #include <sys/types.h>
  21
  22 #include <assert.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "mandoc.h"
  28 #include "out.h"
  29 #include "html.h"
  30
  31 static void
  32 eqn_box(struct html *p, const struct eqn_box *bp)
  33 {
  34         struct tag      *post, *row, *cell, *t;
  35         const struct eqn_box *child, *parent;
  36         size_t           i, j, rows;
  37
  38         if (NULL == bp)
  39                 return;
  40
  41         post = NULL;
  42
  43         /*
  44          * Special handling for a matrix, which is presented to us in
  45          * column order, but must be printed in row-order.
  46          */
  47         if (EQN_MATRIX == bp->type) {
  48                 if (NULL == bp->first)
  49                         goto out;
  50                 if (EQN_LIST != bp->first->type) {
  51                         eqn_box(p, bp->first);
  52                         goto out;
  53                 }
  54                 if (NULL == (parent = bp->first->first))
  55                         goto out;
  56                 /* Estimate the number of rows, first. */
  57                 if (NULL == (child = parent->first))
  58                         goto out;
  59                 for (rows = 0; NULL != child; rows++)
  60                         child = child->next;
  61                 /* Print row-by-row. */
  62                 post = print_otag(p, TAG_MTABLE, "");
  63                 for (i = 0; i < rows; i++) {
  64                         parent = bp->first->first;
  65                         row = print_otag(p, TAG_MTR, "");
  66                         while (NULL != parent) {
  67                                 child = parent->first;
  68                                 for (j = 0; j < i; j++) {
  69                                         if (NULL == child)
  70                                                 break;
  71                                         child = child->next;
  72                                 }
  73                                 cell = print_otag(p, TAG_MTD, "");
  74                                 /*
  75                                  * If we have no data for this
  76                                  * particular cell, then print a
  77                                  * placeholder and continue--don't puke.
  78                                  */
  79                                 if (NULL != child)
  80                                         eqn_box(p, child->first);
  81                                 print_tagq(p, cell);
  82                                 parent = parent->next;
  83                         }
  84                         print_tagq(p, row);
  85                 }
  86                 goto out;
  87         }
  88
  89         switch (bp->pos) {
  90         case (EQNPOS_TO):
  91                 post = print_otag(p, TAG_MOVER, "");
  92                 break;
  93         case (EQNPOS_SUP):
  94                 post = print_otag(p, TAG_MSUP, "");
  95                 break;
  96         case (EQNPOS_FROM):
  97                 post = print_otag(p, TAG_MUNDER, "");
  98                 break;
  99         case (EQNPOS_SUB):
 100                 post = print_otag(p, TAG_MSUB, "");
 101                 break;
 102         case (EQNPOS_OVER):
 103                 post = print_otag(p, TAG_MFRAC, "");
 104                 break;
 105         case (EQNPOS_FROMTO):
 106                 post = print_otag(p, TAG_MUNDEROVER, "");
 107                 break;
 108         case (EQNPOS_SUBSUP):
 109                 post = print_otag(p, TAG_MSUBSUP, "");
 110                 break;
 111         case (EQNPOS_SQRT):
 112                 post = print_otag(p, TAG_MSQRT, "");
 113                 break;
 114         default:
 115                 break;
 116         }
 117
 118         if (bp->top || bp->bottom) {
 119                 assert(NULL == post);
 120                 if (bp->top && NULL == bp->bottom)
 121                         post = print_otag(p, TAG_MOVER, "");
 122                 else if (bp->top && bp->bottom)
 123                         post = print_otag(p, TAG_MUNDEROVER, "");
 124                 else if (bp->bottom)
 125                         post = print_otag(p, TAG_MUNDER, "");
 126         }
 127
 128         if (EQN_PILE == bp->type) {
 129                 assert(NULL == post);
 130                 if (bp->first != NULL && bp->first->type == EQN_LIST)
 131                         post = print_otag(p, TAG_MTABLE, "");
 132         } else if (bp->type == EQN_LIST &&
 133             bp->parent && bp->parent->type == EQN_PILE) {
 134                 assert(NULL == post);
 135                 post = print_otag(p, TAG_MTR, "");
 136                 print_otag(p, TAG_MTD, "");
 137         }
 138
 139         if (NULL != bp->text) {
 140                 assert(NULL == post);
 141                 post = print_otag(p, TAG_MI, "");
 142                 print_text(p, bp->text);
 143         } else if (NULL == post) {
 144                 if (NULL != bp->left || NULL != bp->right)
 145                         post = print_otag(p, TAG_MFENCED, "??",
 146                             "open", bp->left == NULL ? "" : bp->left,
 147                             "close", bp->right == NULL ? "" : bp->right);
 148                 if (NULL == post)
 149                         post = print_otag(p, TAG_MROW, "");
 150                 else
 151                         print_otag(p, TAG_MROW, "");
 152         }
 153
 154         eqn_box(p, bp->first);
 155
 156 out:
 157         if (NULL != bp->bottom) {
 158                 t = print_otag(p, TAG_MO, "");
 159                 print_text(p, bp->bottom);
 160                 print_tagq(p, t);
 161         }
 162         if (NULL != bp->top) {
 163                 t = print_otag(p, TAG_MO, "");
 164                 print_text(p, bp->top);
 165                 print_tagq(p, t);
 166         }
 167
 168         if (NULL != post)
 169                 print_tagq(p, post);
 170
 171         eqn_box(p, bp->next);
 172 }
 173
 174 void
 175 print_eqn(struct html *p, const struct eqn *ep)
 176 {
 177         struct tag      *t;
 178
 179         t = print_otag(p, TAG_MATH, "c", "eqn");
 180
 181         p->flags |= HTML_NONOSPACE;
 182         eqn_box(p, ep->root);
 183         p->flags &= ~HTML_NONOSPACE;
 184
 185         print_tagq(p, t);
 186 }