src/output_xhtml.cpp

   1 /**
   2  * \file output_xhtml.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Richard Heck
   7  *
   8  * This code is based upon output_docbook.cpp
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  */
  12
  13 #include <config.h>
  14
  15 #include "output_xhtml.h"
  16
  17 #include "Buffer.h"
  18 #include "buffer_funcs.h"
  19 #include "BufferParams.h"
  20 #include "Counters.h"
  21 #include "Layout.h"
  22 #include "OutputParams.h"
  23 #include "Paragraph.h"
  24 #include "paragraph_funcs.h"
  25 #include "ParagraphList.h"
  26 #include "ParagraphParameters.h"
  27 #include "sgml.h"
  28 #include "TextClass.h"
  29
  30 #include "support/lassert.h"
  31 #include "support/debug.h"
  32 #include "support/lstrings.h"
  33
  34 #include <boost/next_prior.hpp>
  35 #include <vector>
  36
  37 using namespace std;
  38 using namespace lyx::support;
  39
  40 namespace lyx {
  41
  42 namespace html {
  43
  44 docstring escapeChar(char_type c)
  45 {
  46         docstring str;
  47         switch (c) {
  48         case ' ':
  49                 str += " ";
  50                 break;
  51         case '&':
  52                 str += "&amp;";
  53                 break;
  54         case '<':
  55                 str += "&lt;";
  56                 break;
  57         case '>':
  58                 str += "&gt;";
  59                 break;
  60         default:
  61                 str += c;
  62                 break;
  63         }
  64         return str;
  65 }
  66
  67
  68 // FIXME This needs to be protected somehow.
  69 static vector<string> taglist;
  70
  71 bool openTag(odocstream & os, string tag, string attr)
  72 {
  73         if (tag.empty())
  74                 return false;
  75         // FIXME This is completely primitive. We need something
  76         // a lot better.
  77         // Now do some checks on nesting of tags.
  78         if (tag == "p")
  79                 if (find(taglist.begin(), taglist.end(), "p") != taglist.end())
  80                         return false;
  81         if (!attr.empty())
  82                 attr = ' ' + attr;
  83         os << from_ascii("<" + tag + attr + ">");
  84         taglist.push_back(tag);
  85         return true;
  86 }
  87
  88
  89 bool closeTag(odocstream & os, string tag)
  90 {
  91         if (tag.empty())
  92                 return false;
  93         // FIXME Check for proper nesting
  94         if (taglist.empty()){
  95                 LYXERR0("Last tag not found when closing `" << tag << "'!");
  96                 return false;
  97         }
  98         string const & lasttag = taglist.back();
  99         if (lasttag != tag)  {
 100                 LYXERR0("Last tag was `" << lasttag << "' when closing `" << tag << "'!");
 101                 return false;
 102         }
 103         taglist.pop_back();
 104         os << from_ascii("</" + tag + ">");
 105         return true;
 106 }
 107
 108
 109
 110 } // html
 111
 112 namespace {
 113
 114 bool openTag(odocstream & os, Layout const & lay)
 115 {
 116         return html::openTag(os, lay.htmltag(), lay.htmlattr());
 117 }
 118
 119
 120 bool closeTag(odocstream & os, Layout const & lay)
 121 {
 122         return html::closeTag(os, lay.htmltag());
 123 }
 124
 125
 126 bool openLabelTag(odocstream & os, Layout const & lay)
 127 {
 128         return html::openTag(os, lay.htmllabel(), lay.htmllabelattr());
 129 }
 130
 131
 132 bool closeLabelTag(odocstream & os, Layout const & lay)
 133 {
 134         return html::closeTag(os, lay.htmllabel());
 135 }
 136
 137
 138 bool openItemTag(odocstream & os, Layout const & lay)
 139 {
 140         return html::openTag(os, lay.htmlitem(), lay.htmlitemattr());
 141 }
 142
 143
 144 bool closeItemTag(odocstream & os, Layout const & lay)
 145 {
 146         return html::closeTag(os, lay.htmlitem());
 147 }
 148
 149 ParagraphList::const_iterator searchParagraph(
 150         ParagraphList::const_iterator p,
 151   ParagraphList::const_iterator const & pend)
 152 {
 153         for (++p; p != pend && p->layout().latextype == LATEX_PARAGRAPH; ++p)
 154                 ;
 155
 156         return p;
 157 }
 158
 159
 160 ParagraphList::const_iterator searchEnvironment(
 161                 ParagraphList::const_iterator p,
 162                 ParagraphList::const_iterator const & pend)
 163 {
 164         Layout const & bstyle = p->layout();
 165         size_t const depth = p->params().depth();
 166         for (++p; p != pend; ++p) {
 167                 Layout const & style = p->layout();
 168                 // It shouldn't happen that e.g. a section command occurs inside
 169                 // a quotation environment, at a higher depth, but as of 6/2009,
 170                 // it can happen. We pretend that it's just at lowest depth.
 171                 if (style.latextype == LATEX_COMMAND)
 172                         return p;
 173                 // If depth is down, we're done
 174                 if (p->params().depth() < depth)
 175                         return p;
 176                 // If depth is up, we're not done
 177                 if (p->params().depth() > depth)
 178                         continue;
 179                 // Now we know we are at the same depth
 180                 if (style.latextype == LATEX_PARAGRAPH
 181                     || style.latexname() != bstyle.latexname())
 182                         return p;
 183
 184         }
 185         return pend;
 186 }
 187
 188
 189 ParagraphList::const_iterator makeParagraphs(Buffer const & buf,
 190                                             odocstream & os,
 191                                             OutputParams const & runparams,
 192                                             ParagraphList const & paragraphs,
 193                                             ParagraphList::const_iterator const & pbegin,
 194                                             ParagraphList::const_iterator const & pend)
 195 {
 196         ParagraphList::const_iterator par = pbegin;
 197         for (; par != pend; ++par) {
 198                 Layout const & lay = par->layout();
 199                 if (par != pbegin)
 200                         os << '\n';
 201                 bool const opened = openTag(os, lay);
 202                 par->simpleLyXHTMLOnePar(buf, os, runparams,
 203                                 outerFont(distance(paragraphs.begin(), par), paragraphs));
 204                 if (opened)
 205                         closeTag(os, lay);
 206                 os << '\n';
 207         }
 208         return pend;
 209 }
 210
 211
 212 ParagraphList::const_iterator makeEnvironment(Buffer const & buf,
 213                                               odocstream & os,
 214                                               OutputParams const & runparams,
 215                                               ParagraphList const & paragraphs,
 216                                               ParagraphList::const_iterator const & pbegin,
 217                                               ParagraphList::const_iterator const & pend) {
 218
 219         ParagraphList::const_iterator par = pbegin;
 220         Layout const & bstyle = par->layout();
 221         depth_type const origdepth = pbegin->params().depth();
 222
 223         // Open tag for this environment
 224         bool const main_tag_opened = openTag(os, bstyle);
 225         os << '\n';
 226
 227         // we will on occasion need to remember a layout from before.
 228         Layout const * lastlay = 0;
 229
 230         while (par != pend) {
 231                 Layout const & style = par->layout();
 232                 ParagraphList::const_iterator send;
 233                 // this will be positive, if we want to skip the initial word
 234                 // (if it's been taken for the label).
 235                 pos_type sep = 0;
 236
 237                 switch (style.latextype) {
 238                 case LATEX_ENVIRONMENT:
 239                 // case LATEX_LIST_ENVIRONMENT??
 240                 case LATEX_ITEM_ENVIRONMENT: {
 241                         // There are two possiblities in this case.
 242                         // One is that we are still in the environment in which we
 243                         // started---which we will be if the depth is the same.
 244                         if (par->params().depth() == origdepth) {
 245                                 if (lastlay != 0) {
 246                                         closeItemTag(os, *lastlay);
 247                                         lastlay = 0;
 248                                 }
 249                                 Layout const & cstyle = par->layout();
 250                                 if (cstyle.labeltype == LABEL_MANUAL) {
 251                                         bool const label_tag_opened = openLabelTag(os, cstyle);
 252                                         sep = par->firstWordLyXHTML(os, runparams);
 253                                         if (label_tag_opened)
 254                                                 closeLabelTag(os, cstyle);
 255                                         os << '\n';
 256                                 } else if (style.latextype == LATEX_ENVIRONMENT
 257                                            && style.labeltype != LABEL_NO_LABEL) {
 258                                         bool const label_tag_opened = openLabelTag(os, cstyle);
 259                                         if (!style.counter.empty())
 260                                                 buf.params().documentClass().counters().step(cstyle.counter);
 261                                         os << pbegin->expandLabel(style, buf.params(), false);
 262                                         if (label_tag_opened)
 263                                                 closeLabelTag(os, cstyle);
 264                                         os << '\n';
 265                                 }
 266
 267                                 bool const item_tag_opened = openItemTag(os, cstyle);
 268                                 par->simpleLyXHTMLOnePar(buf, os, runparams,
 269                                         outerFont(distance(paragraphs.begin(), par), paragraphs), sep);
 270                                 ++par;
 271                                 // We may not want to close the tag yet, in particular,
 272                                 if (item_tag_opened
 273                                                 // if we're not at the end...
 274                                     && par != pend
 275                                     //  and are doing items...
 276                                     && style.latextype == LATEX_ITEM_ENVIRONMENT
 277                                     // and if the depth has changed...
 278                                     && par->params().depth() != origdepth) {
 279                                                 // then we'll save this layout for later, and close it when
 280                                                 // we get another item.
 281                                                 lastlay = &cstyle;
 282                                 } else {
 283                                                 closeItemTag(os, cstyle); // FIXME
 284                                         os << '\n';
 285                                 }
 286                         }
 287                         // The other possibility is that the depth has increased, in which
 288                         // case we need to recurse.
 289                         else {
 290                                 send = searchEnvironment(par, pend);
 291                                 par = makeEnvironment(buf, os, runparams, paragraphs, par, send);
 292                         }
 293                         break;
 294                 }
 295                 case LATEX_PARAGRAPH:
 296                         send = searchParagraph(par, pend);
 297                         par = makeParagraphs(buf, os, runparams, paragraphs, par, send);
 298                         break;
 299                 // FIXME
 300                 case LATEX_BIB_ENVIRONMENT:
 301                 case LATEX_COMMAND:
 302                         break;
 303                 }
 304         }
 305
 306         if (lastlay != 0)
 307                 closeItemTag(os, *lastlay);
 308         if (main_tag_opened)
 309                 closeTag(os, bstyle);
 310         os << '\n';
 311         return pend;
 312 }
 313
 314
 315 void makeCommand(Buffer const & buf,
 316                                           odocstream & os,
 317                                           OutputParams const & runparams,
 318                                           ParagraphList const & paragraphs,
 319                                           ParagraphList::const_iterator const & pbegin)
 320 {
 321         Layout const & style = pbegin->layout();
 322
 323         bool const main_tag_opened = openTag(os, style);
 324
 325         // Label around sectioning number:
 326         if (style.labeltype != LABEL_NO_LABEL) {
 327                 bool const label_tag_opened = openLabelTag(os, style);
 328                 if (!style.counter.empty())
 329                         buf.params().documentClass().counters().step(style.counter);
 330                 os << pbegin->expandLabel(style, buf.params(), false);
 331                 if (label_tag_opened)
 332                         closeLabelTag(os, style);
 333                 // Otherwise the label might run together with the text
 334                 os << ' ';
 335         }
 336
 337         pbegin->simpleLyXHTMLOnePar(buf, os, runparams,
 338                         outerFont(distance(paragraphs.begin(), pbegin), paragraphs));
 339         if (main_tag_opened)
 340                 closeTag(os, style);
 341 }
 342
 343 } // end anonymous namespace
 344
 345
 346 void xhtmlParagraphs(ParagraphList const & paragraphs,
 347                        Buffer const & buf,
 348                        odocstream & os,
 349                        OutputParams const & runparams)
 350 {
 351         ParagraphList::const_iterator par = paragraphs.begin();
 352         ParagraphList::const_iterator pend = paragraphs.end();
 353
 354         while (par != pend) {
 355                 Layout const & style = par->layout();
 356                 ParagraphList::const_iterator lastpar = par;
 357                 ParagraphList::const_iterator send;
 358
 359                 switch (style.latextype) {
 360                 case LATEX_COMMAND: {
 361                         // The files with which we are working never have more than
 362                         // one paragraph in a command structure.
 363                         makeCommand(buf, os, runparams, paragraphs, par);
 364                         ++par;
 365                         break;
 366                 }
 367                 case LATEX_ENVIRONMENT:
 368                 case LATEX_ITEM_ENVIRONMENT: {
 369                         send = searchEnvironment(par, pend);
 370                         par = makeEnvironment(buf, os, runparams, paragraphs, par,send);
 371                         break;
 372                 }
 373                 case LATEX_PARAGRAPH:
 374                         send = searchParagraph(par, pend);
 375                         par = makeParagraphs(buf, os, runparams, paragraphs, par,send);
 376                         break;
 377                 default:
 378                         break;
 379                 }
 380                 os << '\n';
 381                 // makeEnvironment may process more than one paragraphs and bypass pend
 382                 if (distance(lastpar, par) >= distance(lastpar, pend))
 383                         break;
 384         }
 385 }
 386
 387
 388 } // namespace lyx