| 1 | /* |
| 2 | * Paper printing pre-backend for Halibut. |
| 3 | * |
| 4 | * This module does all the processing common to both PostScript |
| 5 | * and PDF output: selecting fonts, line wrapping and page breaking |
| 6 | * in accordance with font metrics, laying out the contents and |
| 7 | * index pages, generally doing all the page layout. After this, |
| 8 | * bk_ps.c and bk_pdf.c should only need to do linear translations |
| 9 | * into their literal output format. |
| 10 | */ |
| 11 | |
| 12 | /* |
| 13 | * To be done: |
| 14 | * |
| 15 | * - implement some simple graphics |
| 16 | * * I had an underline below chapter headings in the original |
| 17 | * Perl version, and I thought it looked rather nice |
| 18 | * * also we need para_Rule. |
| 19 | * |
| 20 | * - set up contents section now we know what sections begin on |
| 21 | * which pages |
| 22 | * |
| 23 | * - do PDF outline |
| 24 | * |
| 25 | * - index |
| 26 | * |
| 27 | * - header/footer? Page numbers at least would be handy. Fully |
| 28 | * configurable footer can wait, though. |
| 29 | * |
| 30 | * That should bring us to the same level of functionality that |
| 31 | * original-Halibut had, and the same in PDF plus the obvious |
| 32 | * interactive navigation features. After that, in future work: |
| 33 | * |
| 34 | * - linearised PDF, perhaps? |
| 35 | * |
| 36 | * - I'm uncertain of whether I need to include a ToUnicode CMap |
| 37 | * in each of my font definitions in PDF. Currently things (by |
| 38 | * which I mean cut and paste out of acroread) seem to be |
| 39 | * working fairly happily without it, but I don't know. |
| 40 | * |
| 41 | * - configurability |
| 42 | * |
| 43 | * - title pages |
| 44 | */ |
| 45 | |
| 46 | #include <assert.h> |
| 47 | #include <stdio.h> |
| 48 | |
| 49 | #include "halibut.h" |
| 50 | #include "paper.h" |
| 51 | |
| 52 | static font_data *make_std_font(font_list *fontlist, char const *name); |
| 53 | static void wrap_paragraph(para_data *pdata, word *words, |
| 54 | int w, int i1, int i2); |
| 55 | static page_data *page_breaks(line_data *first, line_data *last, |
| 56 | int page_height); |
| 57 | static void render_line(line_data *ldata, int left_x, int top_y, |
| 58 | xref_dest *dest, keywordlist *keywords); |
| 59 | static int paper_width_simple(para_data *pdata, word *text); |
| 60 | static void code_paragraph(para_data *pdata, |
| 61 | font_data *fn, font_data *fi, font_data *fb, |
| 62 | int font_size, int indent, word *words); |
| 63 | |
| 64 | void *paper_pre_backend(paragraph *sourceform, keywordlist *keywords, |
| 65 | indexdata *idx) { |
| 66 | paragraph *p; |
| 67 | document *doc; |
| 68 | int indent, extra_indent, firstline_indent, aux_indent; |
| 69 | para_data *pdata; |
| 70 | line_data *ldata, *firstline, *lastline; |
| 71 | font_data *tr, *ti, *hr, *hi, *cr, *co, *cb; |
| 72 | page_data *pages; |
| 73 | font_list *fontlist; |
| 74 | word *aux, *aux2; |
| 75 | |
| 76 | /* |
| 77 | * FIXME: All these things ought to become configurable. |
| 78 | */ |
| 79 | int paper_width = 595 * 4096; |
| 80 | int paper_height = 841 * 4096; |
| 81 | int left_margin = 72 * 4096; |
| 82 | int top_margin = 72 * 4096; |
| 83 | int right_margin = 72 * 4096; |
| 84 | int bottom_margin = 108 * 4096; |
| 85 | int indent_list_bullet = 6 * 4096; |
| 86 | int indent_list = 24 * 4096; |
| 87 | int indent_quote = 18 * 4096; |
| 88 | int base_leading = 4096; |
| 89 | int base_para_spacing = 10 * 4096; |
| 90 | int chapter_top_space = 72 * 4096; |
| 91 | int sect_num_left_space = 12 * 4096; |
| 92 | |
| 93 | int base_width = paper_width - left_margin - right_margin; |
| 94 | int page_height = paper_height - top_margin - bottom_margin; |
| 95 | |
| 96 | IGNORE(idx); /* FIXME */ |
| 97 | |
| 98 | /* |
| 99 | * First, set up some font structures. |
| 100 | */ |
| 101 | fontlist = mknew(font_list); |
| 102 | fontlist->head = fontlist->tail = NULL; |
| 103 | tr = make_std_font(fontlist, "Times-Roman"); |
| 104 | ti = make_std_font(fontlist, "Times-Italic"); |
| 105 | hr = make_std_font(fontlist, "Helvetica-Bold"); |
| 106 | hi = make_std_font(fontlist, "Helvetica-BoldOblique"); |
| 107 | cr = make_std_font(fontlist, "Courier"); |
| 108 | co = make_std_font(fontlist, "Courier-Oblique"); |
| 109 | cb = make_std_font(fontlist, "Courier-Bold"); |
| 110 | |
| 111 | /* |
| 112 | * Go through and break up each paragraph into lines. |
| 113 | */ |
| 114 | indent = 0; |
| 115 | firstline = lastline = NULL; |
| 116 | for (p = sourceform; p; p = p->next) { |
| 117 | p->private_data = NULL; |
| 118 | |
| 119 | switch (p->type) { |
| 120 | /* |
| 121 | * These paragraph types are either invisible or don't |
| 122 | * define text in the normal sense. Either way, they |
| 123 | * don't require wrapping. |
| 124 | */ |
| 125 | case para_IM: |
| 126 | case para_BR: |
| 127 | case para_Rule: |
| 128 | case para_Biblio: |
| 129 | case para_NotParaType: |
| 130 | case para_Config: |
| 131 | case para_VersionID: |
| 132 | case para_NoCite: |
| 133 | break; |
| 134 | |
| 135 | /* |
| 136 | * These paragraph types don't require wrapping, but |
| 137 | * they do affect the line width to which we wrap the |
| 138 | * rest of the paragraphs, so we need to pay attention. |
| 139 | */ |
| 140 | case para_LcontPush: |
| 141 | indent += indent_list; break; |
| 142 | case para_LcontPop: |
| 143 | indent -= indent_list; assert(indent >= 0); break; |
| 144 | case para_QuotePush: |
| 145 | indent += indent_quote; break; |
| 146 | case para_QuotePop: |
| 147 | indent -= indent_quote; assert(indent >= 0); break; |
| 148 | |
| 149 | /* |
| 150 | * This paragraph type is special. Process it |
| 151 | * specially. |
| 152 | */ |
| 153 | case para_Code: |
| 154 | pdata = mknew(para_data); |
| 155 | code_paragraph(pdata, cr, co, cb, 12, indent, p->words); |
| 156 | p->private_data = pdata; |
| 157 | if (pdata->first != pdata->last) { |
| 158 | pdata->first->penalty_after += 100000; |
| 159 | pdata->last->penalty_before += 100000; |
| 160 | } |
| 161 | break; |
| 162 | |
| 163 | /* |
| 164 | * All of these paragraph types require wrapping in the |
| 165 | * ordinary way. So we must supply a set of fonts, a |
| 166 | * line width and auxiliary information (e.g. bullet |
| 167 | * text) for each one. |
| 168 | */ |
| 169 | case para_Chapter: |
| 170 | case para_Appendix: |
| 171 | case para_UnnumberedChapter: |
| 172 | case para_Heading: |
| 173 | case para_Subsect: |
| 174 | case para_Normal: |
| 175 | case para_BiblioCited: |
| 176 | case para_Bullet: |
| 177 | case para_NumberedList: |
| 178 | case para_DescribedThing: |
| 179 | case para_Description: |
| 180 | case para_Copyright: |
| 181 | case para_Title: |
| 182 | pdata = mknew(para_data); |
| 183 | |
| 184 | /* |
| 185 | * Choose fonts for this paragraph. |
| 186 | * |
| 187 | * FIXME: All of this ought to be completely |
| 188 | * user-configurable. |
| 189 | */ |
| 190 | switch (p->type) { |
| 191 | case para_Title: |
| 192 | pdata->fonts[FONT_NORMAL] = hr; |
| 193 | pdata->sizes[FONT_NORMAL] = 24; |
| 194 | pdata->fonts[FONT_EMPH] = hi; |
| 195 | pdata->sizes[FONT_EMPH] = 24; |
| 196 | pdata->fonts[FONT_CODE] = cb; |
| 197 | pdata->sizes[FONT_CODE] = 24; |
| 198 | break; |
| 199 | |
| 200 | case para_Chapter: |
| 201 | case para_Appendix: |
| 202 | case para_UnnumberedChapter: |
| 203 | pdata->fonts[FONT_NORMAL] = hr; |
| 204 | pdata->sizes[FONT_NORMAL] = 20; |
| 205 | pdata->fonts[FONT_EMPH] = hi; |
| 206 | pdata->sizes[FONT_EMPH] = 20; |
| 207 | pdata->fonts[FONT_CODE] = cb; |
| 208 | pdata->sizes[FONT_CODE] = 20; |
| 209 | break; |
| 210 | |
| 211 | case para_Heading: |
| 212 | case para_Subsect: |
| 213 | pdata->fonts[FONT_NORMAL] = hr; |
| 214 | pdata->fonts[FONT_EMPH] = hi; |
| 215 | pdata->fonts[FONT_CODE] = cb; |
| 216 | pdata->sizes[FONT_NORMAL] = |
| 217 | pdata->sizes[FONT_EMPH] = |
| 218 | pdata->sizes[FONT_CODE] = |
| 219 | (p->aux == 0 ? 16 : p->aux == 1 ? 14 : 13); |
| 220 | break; |
| 221 | |
| 222 | case para_Normal: |
| 223 | case para_BiblioCited: |
| 224 | case para_Bullet: |
| 225 | case para_NumberedList: |
| 226 | case para_DescribedThing: |
| 227 | case para_Description: |
| 228 | case para_Copyright: |
| 229 | pdata->fonts[FONT_NORMAL] = tr; |
| 230 | pdata->sizes[FONT_NORMAL] = 12; |
| 231 | pdata->fonts[FONT_EMPH] = ti; |
| 232 | pdata->sizes[FONT_EMPH] = 12; |
| 233 | pdata->fonts[FONT_CODE] = cr; |
| 234 | pdata->sizes[FONT_CODE] = 12; |
| 235 | break; |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * Also select an indentation level depending on the |
| 240 | * paragraph type (list paragraphs other than |
| 241 | * para_DescribedThing need extra indent). |
| 242 | * |
| 243 | * (FIXME: Perhaps at some point we might even arrange |
| 244 | * for the user to be able to request indented first |
| 245 | * lines in paragraphs.) |
| 246 | */ |
| 247 | if (p->type == para_Bullet || |
| 248 | p->type == para_NumberedList || |
| 249 | p->type == para_Description) { |
| 250 | extra_indent = firstline_indent = indent_list; |
| 251 | } else { |
| 252 | extra_indent = firstline_indent = 0; |
| 253 | } |
| 254 | |
| 255 | /* |
| 256 | * Find the auxiliary text for this paragraph. |
| 257 | */ |
| 258 | aux = aux2 = NULL; |
| 259 | aux_indent = 0; |
| 260 | |
| 261 | switch (p->type) { |
| 262 | case para_Chapter: |
| 263 | case para_Appendix: |
| 264 | case para_Heading: |
| 265 | case para_Subsect: |
| 266 | /* |
| 267 | * For some heading styles (FIXME: be able to |
| 268 | * configure which), the auxiliary text contains |
| 269 | * the chapter number and is arranged to be |
| 270 | * right-aligned a few points left of the primary |
| 271 | * margin. For other styles, the auxiliary text is |
| 272 | * the full chapter _name_ and takes up space |
| 273 | * within the (wrapped) chapter title, meaning that |
| 274 | * we must move the first line indent over to make |
| 275 | * space for it. |
| 276 | */ |
| 277 | if (p->type == para_Heading || p->type == para_Subsect) { |
| 278 | int len; |
| 279 | |
| 280 | aux = p->kwtext2; |
| 281 | len = paper_width_simple(pdata, p->kwtext2); |
| 282 | aux_indent = -len - sect_num_left_space; |
| 283 | } else { |
| 284 | aux = p->kwtext; |
| 285 | aux2 = mknew(word); |
| 286 | aux2->next = NULL; |
| 287 | aux2->alt = NULL; |
| 288 | aux2->type = word_Normal; |
| 289 | aux2->text = ustrdup(L": "); |
| 290 | aux2->breaks = FALSE; |
| 291 | aux2->aux = 0; |
| 292 | aux_indent = 0; |
| 293 | |
| 294 | firstline_indent += paper_width_simple(pdata, aux); |
| 295 | firstline_indent += paper_width_simple(pdata, aux2); |
| 296 | } |
| 297 | break; |
| 298 | |
| 299 | case para_Bullet: |
| 300 | /* |
| 301 | * Auxiliary text consisting of a bullet. (FIXME: |
| 302 | * configurable bullet.) |
| 303 | */ |
| 304 | aux = mknew(word); |
| 305 | aux->next = NULL; |
| 306 | aux->alt = NULL; |
| 307 | aux->type = word_Normal; |
| 308 | aux->text = ustrdup(L"\x2022"); |
| 309 | aux->breaks = FALSE; |
| 310 | aux->aux = 0; |
| 311 | aux_indent = indent + indent_list_bullet; |
| 312 | break; |
| 313 | |
| 314 | case para_NumberedList: |
| 315 | /* |
| 316 | * Auxiliary text consisting of the number followed |
| 317 | * by a (FIXME: configurable) full stop. |
| 318 | */ |
| 319 | aux = p->kwtext; |
| 320 | aux2 = mknew(word); |
| 321 | aux2->next = NULL; |
| 322 | aux2->alt = NULL; |
| 323 | aux2->type = word_Normal; |
| 324 | aux2->text = ustrdup(L"."); |
| 325 | aux2->breaks = FALSE; |
| 326 | aux2->aux = 0; |
| 327 | aux_indent = indent + indent_list_bullet; |
| 328 | break; |
| 329 | |
| 330 | case para_BiblioCited: |
| 331 | /* |
| 332 | * Auxiliary text consisting of the bibliography |
| 333 | * reference text, and a trailing space. |
| 334 | */ |
| 335 | aux = p->kwtext; |
| 336 | aux2 = mknew(word); |
| 337 | aux2->next = NULL; |
| 338 | aux2->alt = NULL; |
| 339 | aux2->type = word_Normal; |
| 340 | aux2->text = ustrdup(L" "); |
| 341 | aux2->breaks = FALSE; |
| 342 | aux2->aux = 0; |
| 343 | aux_indent = indent; |
| 344 | firstline_indent += paper_width_simple(pdata, aux); |
| 345 | firstline_indent += paper_width_simple(pdata, aux2); |
| 346 | break; |
| 347 | } |
| 348 | |
| 349 | wrap_paragraph(pdata, p->words, base_width, |
| 350 | indent + firstline_indent, |
| 351 | indent + extra_indent); |
| 352 | |
| 353 | p->private_data = pdata; |
| 354 | |
| 355 | pdata->first->aux_text = aux; |
| 356 | pdata->first->aux_text_2 = aux2; |
| 357 | pdata->first->aux_left_indent = aux_indent; |
| 358 | |
| 359 | /* |
| 360 | * Line breaking penalties. |
| 361 | */ |
| 362 | switch (p->type) { |
| 363 | case para_Chapter: |
| 364 | case para_Appendix: |
| 365 | case para_Heading: |
| 366 | case para_Subsect: |
| 367 | case para_UnnumberedChapter: |
| 368 | /* |
| 369 | * Fixed and large penalty for breaking straight |
| 370 | * after a heading; corresponding bonus for |
| 371 | * breaking straight before. |
| 372 | */ |
| 373 | pdata->first->penalty_before = -500000; |
| 374 | pdata->last->penalty_after = 500000; |
| 375 | for (ldata = pdata->first; ldata; ldata = ldata->next) |
| 376 | ldata->penalty_after = 500000; |
| 377 | break; |
| 378 | |
| 379 | case para_DescribedThing: |
| 380 | /* |
| 381 | * This is treated a bit like a small heading: |
| 382 | * there's a penalty for breaking after it (i.e. |
| 383 | * between it and its description), and a bonus for |
| 384 | * breaking before it (actually _between_ list |
| 385 | * items). |
| 386 | */ |
| 387 | pdata->first->penalty_before = -200000; |
| 388 | pdata->last->penalty_after = 200000; |
| 389 | break; |
| 390 | |
| 391 | default: |
| 392 | /* |
| 393 | * Most paragraph types: widow/orphan control by |
| 394 | * discouraging breaking one line from the end of |
| 395 | * any paragraph. |
| 396 | */ |
| 397 | if (pdata->first != pdata->last) { |
| 398 | pdata->first->penalty_after = 100000; |
| 399 | pdata->last->penalty_before = 100000; |
| 400 | } |
| 401 | break; |
| 402 | } |
| 403 | |
| 404 | break; |
| 405 | } |
| 406 | |
| 407 | if (p->private_data) { |
| 408 | pdata = (para_data *)p->private_data; |
| 409 | |
| 410 | /* |
| 411 | * Set the line spacing for each line in this paragraph. |
| 412 | */ |
| 413 | for (ldata = pdata->first; ldata; ldata = ldata->next) { |
| 414 | if (ldata == pdata->first) |
| 415 | ldata->space_before = base_para_spacing / 2; |
| 416 | else |
| 417 | ldata->space_before = base_leading / 2; |
| 418 | if (ldata == pdata->last) |
| 419 | ldata->space_after = base_para_spacing / 2; |
| 420 | else |
| 421 | ldata->space_after = base_leading / 2; |
| 422 | ldata->page_break = FALSE; |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * Some kinds of section heading do require a page |
| 427 | * break before them. |
| 428 | */ |
| 429 | if (p->type == para_Title || |
| 430 | p->type == para_Chapter || |
| 431 | p->type == para_Appendix || |
| 432 | p->type == para_UnnumberedChapter) { |
| 433 | pdata->first->page_break = TRUE; |
| 434 | pdata->first->space_before = chapter_top_space; |
| 435 | } |
| 436 | |
| 437 | /* |
| 438 | * Link all line structures together into a big list. |
| 439 | */ |
| 440 | if (pdata->first) { |
| 441 | if (lastline) { |
| 442 | lastline->next = pdata->first; |
| 443 | pdata->first->prev = lastline; |
| 444 | } else { |
| 445 | firstline = pdata->first; |
| 446 | pdata->first->prev = NULL; |
| 447 | } |
| 448 | lastline = pdata->last; |
| 449 | } |
| 450 | } |
| 451 | } |
| 452 | |
| 453 | /* |
| 454 | * Now we have an enormous linked list of every line of text in |
| 455 | * the document. Break it up into pages. |
| 456 | */ |
| 457 | pages = page_breaks(firstline, lastline, page_height); |
| 458 | |
| 459 | /* |
| 460 | * Now we're ready to actually lay out the pages. We do this by |
| 461 | * looping over _paragraphs_, since we may need to track cross- |
| 462 | * references between lines and even across pages. |
| 463 | */ |
| 464 | for (p = sourceform; p; p = p->next) { |
| 465 | pdata = (para_data *)p->private_data; |
| 466 | |
| 467 | if (pdata) { |
| 468 | xref_dest dest; |
| 469 | dest.type = NONE; |
| 470 | for (ldata = pdata->first; ldata; ldata = ldata->next) { |
| 471 | render_line(ldata, left_margin, paper_height - top_margin, |
| 472 | &dest, keywords); |
| 473 | if (ldata == pdata->last) |
| 474 | break; |
| 475 | } |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | doc = mknew(document); |
| 480 | doc->fonts = fontlist; |
| 481 | doc->pages = pages; |
| 482 | doc->paper_width = paper_width; |
| 483 | doc->paper_height = paper_height; |
| 484 | return doc; |
| 485 | } |
| 486 | |
| 487 | static font_encoding *new_font_encoding(font_data *font) |
| 488 | { |
| 489 | font_encoding *fe; |
| 490 | int i; |
| 491 | |
| 492 | fe = mknew(font_encoding); |
| 493 | fe->next = NULL; |
| 494 | |
| 495 | if (font->list->tail) |
| 496 | font->list->tail->next = fe; |
| 497 | else |
| 498 | font->list->head = fe; |
| 499 | font->list->tail = fe; |
| 500 | |
| 501 | fe->font = font; |
| 502 | fe->free_pos = 0x21; |
| 503 | |
| 504 | for (i = 0; i < 256; i++) { |
| 505 | fe->vector[i] = NULL; |
| 506 | fe->indices[i] = -1; |
| 507 | fe->to_unicode[i] = 0xFFFF; |
| 508 | } |
| 509 | |
| 510 | return fe; |
| 511 | } |
| 512 | |
| 513 | static font_data *make_std_font(font_list *fontlist, char const *name) |
| 514 | { |
| 515 | const int *widths; |
| 516 | int nglyphs; |
| 517 | font_data *f; |
| 518 | font_encoding *fe; |
| 519 | int i; |
| 520 | |
| 521 | widths = ps_std_font_widths(name); |
| 522 | if (!widths) |
| 523 | return NULL; |
| 524 | |
| 525 | for (nglyphs = 0; ps_std_glyphs[nglyphs] != NULL; nglyphs++); |
| 526 | |
| 527 | f = mknew(font_data); |
| 528 | |
| 529 | f->list = fontlist; |
| 530 | f->name = name; |
| 531 | f->nglyphs = nglyphs; |
| 532 | f->glyphs = ps_std_glyphs; |
| 533 | f->widths = widths; |
| 534 | f->subfont_map = mknewa(subfont_map_entry, nglyphs); |
| 535 | |
| 536 | /* |
| 537 | * Our first subfont will contain all of US-ASCII. This isn't |
| 538 | * really necessary - we could just create custom subfonts |
| 539 | * precisely as the whim of render_string dictated - but |
| 540 | * instinct suggests that it might be nice to have the text in |
| 541 | * the output files look _marginally_ recognisable. |
| 542 | */ |
| 543 | fe = new_font_encoding(f); |
| 544 | fe->free_pos = 0xA1; /* only the top half is free */ |
| 545 | f->latest_subfont = fe; |
| 546 | |
| 547 | for (i = 0; i < (int)lenof(f->bmp); i++) |
| 548 | f->bmp[i] = 0xFFFF; |
| 549 | |
| 550 | for (i = 0; i < nglyphs; i++) { |
| 551 | wchar_t ucs; |
| 552 | ucs = ps_glyph_to_unicode(f->glyphs[i]); |
| 553 | assert(ucs != 0xFFFF); |
| 554 | f->bmp[ucs] = i; |
| 555 | if (ucs >= 0x20 && ucs <= 0x7E) { |
| 556 | fe->vector[ucs] = f->glyphs[i]; |
| 557 | fe->indices[ucs] = i; |
| 558 | fe->to_unicode[ucs] = ucs; |
| 559 | f->subfont_map[i].subfont = fe; |
| 560 | f->subfont_map[i].position = ucs; |
| 561 | } else { |
| 562 | /* |
| 563 | * This character is not yet assigned to a subfont. |
| 564 | */ |
| 565 | f->subfont_map[i].subfont = NULL; |
| 566 | f->subfont_map[i].position = 0; |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | return f; |
| 571 | } |
| 572 | |
| 573 | static int string_width(font_data *font, wchar_t const *string, int *errs) |
| 574 | { |
| 575 | int width = 0; |
| 576 | |
| 577 | if (errs) |
| 578 | *errs = 0; |
| 579 | |
| 580 | for (; *string; string++) { |
| 581 | int index; |
| 582 | |
| 583 | index = font->bmp[(unsigned short)*string]; |
| 584 | if (index == 0xFFFF) { |
| 585 | if (errs) |
| 586 | *errs = 1; |
| 587 | } else { |
| 588 | width += font->widths[index]; |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | return width; |
| 593 | } |
| 594 | |
| 595 | static int paper_width_internal(void *vctx, word *word, int *nspaces); |
| 596 | |
| 597 | struct paper_width_ctx { |
| 598 | int minspacewidth; |
| 599 | para_data *pdata; |
| 600 | }; |
| 601 | |
| 602 | static int paper_width_list(void *vctx, word *text, word *end, int *nspaces) { |
| 603 | int w = 0; |
| 604 | while (text && text != end) { |
| 605 | w += paper_width_internal(vctx, text, nspaces); |
| 606 | text = text->next; |
| 607 | } |
| 608 | return w; |
| 609 | } |
| 610 | |
| 611 | static int paper_width_internal(void *vctx, word *word, int *nspaces) |
| 612 | { |
| 613 | struct paper_width_ctx *ctx = (struct paper_width_ctx *)vctx; |
| 614 | int style, type, findex, width, errs; |
| 615 | wchar_t *str; |
| 616 | |
| 617 | switch (word->type) { |
| 618 | case word_HyperLink: |
| 619 | case word_HyperEnd: |
| 620 | case word_UpperXref: |
| 621 | case word_LowerXref: |
| 622 | case word_XrefEnd: |
| 623 | case word_IndexRef: |
| 624 | return 0; |
| 625 | } |
| 626 | |
| 627 | style = towordstyle(word->type); |
| 628 | type = removeattr(word->type); |
| 629 | |
| 630 | findex = (style == word_Normal ? FONT_NORMAL : |
| 631 | style == word_Emph ? FONT_EMPH : |
| 632 | FONT_CODE); |
| 633 | |
| 634 | if (type == word_Normal) { |
| 635 | str = word->text; |
| 636 | } else if (type == word_WhiteSpace) { |
| 637 | if (findex != FONT_CODE) { |
| 638 | if (nspaces) |
| 639 | (*nspaces)++; |
| 640 | return ctx->minspacewidth; |
| 641 | } else |
| 642 | str = L" "; |
| 643 | } else /* if (type == word_Quote) */ { |
| 644 | if (word->aux == quote_Open) |
| 645 | str = L"\x2018"; /* FIXME: configurability! */ |
| 646 | else |
| 647 | str = L"\x2019"; /* FIXME: configurability! */ |
| 648 | } |
| 649 | |
| 650 | width = string_width(ctx->pdata->fonts[findex], str, &errs); |
| 651 | |
| 652 | if (errs && word->alt) |
| 653 | return paper_width_list(vctx, word->alt, NULL, nspaces); |
| 654 | else |
| 655 | return ctx->pdata->sizes[findex] * width; |
| 656 | } |
| 657 | |
| 658 | static int paper_width(void *vctx, word *word) |
| 659 | { |
| 660 | return paper_width_internal(vctx, word, NULL); |
| 661 | } |
| 662 | |
| 663 | static int paper_width_simple(para_data *pdata, word *text) |
| 664 | { |
| 665 | struct paper_width_ctx ctx; |
| 666 | |
| 667 | ctx.pdata = pdata; |
| 668 | ctx.minspacewidth = |
| 669 | (pdata->sizes[FONT_NORMAL] * |
| 670 | string_width(pdata->fonts[FONT_NORMAL], L" ", NULL)); |
| 671 | |
| 672 | return paper_width_list(&ctx, text, NULL, NULL); |
| 673 | } |
| 674 | |
| 675 | static void wrap_paragraph(para_data *pdata, word *words, |
| 676 | int w, int i1, int i2) |
| 677 | { |
| 678 | wrappedline *wrapping, *p; |
| 679 | int spacewidth; |
| 680 | struct paper_width_ctx ctx; |
| 681 | int line_height; |
| 682 | |
| 683 | /* |
| 684 | * We're going to need to store the line height in every line |
| 685 | * structure we generate. |
| 686 | */ |
| 687 | { |
| 688 | int i; |
| 689 | line_height = 0; |
| 690 | for (i = 0; i < NFONTS; i++) |
| 691 | if (line_height < pdata->sizes[i]) |
| 692 | line_height = pdata->sizes[i]; |
| 693 | line_height *= 4096; |
| 694 | } |
| 695 | |
| 696 | spacewidth = (pdata->sizes[FONT_NORMAL] * |
| 697 | string_width(pdata->fonts[FONT_NORMAL], L" ", NULL)); |
| 698 | if (spacewidth == 0) { |
| 699 | /* |
| 700 | * A font without a space?! Disturbing. I hope this never |
| 701 | * comes up, but I'll make a random guess anyway and set my |
| 702 | * space width to half the point size. |
| 703 | */ |
| 704 | spacewidth = pdata->sizes[FONT_NORMAL] * 4096 / 2; |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * I'm going to set the _minimum_ space width to 3/5 of the |
| 709 | * standard one, and use the standard one as the optimum. |
| 710 | */ |
| 711 | ctx.minspacewidth = spacewidth * 3 / 5; |
| 712 | ctx.pdata = pdata; |
| 713 | |
| 714 | wrapping = wrap_para(words, w - i1, w - i2, paper_width, &ctx, spacewidth); |
| 715 | |
| 716 | /* |
| 717 | * Having done the wrapping, we now concoct a set of line_data |
| 718 | * structures. |
| 719 | */ |
| 720 | pdata->first = pdata->last = NULL; |
| 721 | |
| 722 | for (p = wrapping; p; p = p->next) { |
| 723 | line_data *ldata; |
| 724 | word *wd; |
| 725 | int len, wid, spaces; |
| 726 | |
| 727 | ldata = mknew(line_data); |
| 728 | |
| 729 | ldata->pdata = pdata; |
| 730 | ldata->first = p->begin; |
| 731 | ldata->end = p->end; |
| 732 | ldata->line_height = line_height; |
| 733 | |
| 734 | ldata->xpos = (p == wrapping ? i1 : i2); |
| 735 | |
| 736 | if (pdata->last) { |
| 737 | pdata->last->next = ldata; |
| 738 | ldata->prev = pdata->last; |
| 739 | } else { |
| 740 | pdata->first = ldata; |
| 741 | ldata->prev = NULL; |
| 742 | } |
| 743 | ldata->next = NULL; |
| 744 | pdata->last = ldata; |
| 745 | |
| 746 | spaces = 0; |
| 747 | len = paper_width_list(&ctx, ldata->first, ldata->end, &spaces); |
| 748 | wid = (p == wrapping ? w - i1 : w - i2); |
| 749 | wd = ldata->first; |
| 750 | |
| 751 | ldata->hshortfall = wid - len; |
| 752 | ldata->nspaces = spaces; |
| 753 | /* |
| 754 | * This tells us how much the space width needs to |
| 755 | * change from _min_spacewidth. But we want to store |
| 756 | * its difference from the _natural_ space width, to |
| 757 | * make the text rendering easier. |
| 758 | */ |
| 759 | ldata->hshortfall += ctx.minspacewidth * spaces; |
| 760 | ldata->hshortfall -= spacewidth * spaces; |
| 761 | /* |
| 762 | * Special case: on the last line of a paragraph, we |
| 763 | * never stretch spaces. |
| 764 | */ |
| 765 | if (ldata->hshortfall > 0 && !p->next) |
| 766 | ldata->hshortfall = 0; |
| 767 | |
| 768 | ldata->aux_text = NULL; |
| 769 | ldata->aux_text_2 = NULL; |
| 770 | ldata->aux_left_indent = 0; |
| 771 | ldata->penalty_before = ldata->penalty_after = 0; |
| 772 | } |
| 773 | |
| 774 | } |
| 775 | |
| 776 | static page_data *page_breaks(line_data *first, line_data *last, |
| 777 | int page_height) |
| 778 | { |
| 779 | line_data *l, *m; |
| 780 | page_data *ph, *pt; |
| 781 | |
| 782 | /* |
| 783 | * Page breaking is done by a close analogue of the optimal |
| 784 | * paragraph wrapping algorithm used by wrap_para(). We work |
| 785 | * backwards from the end of the document line by line; for |
| 786 | * each line, we contemplate every possible number of lines we |
| 787 | * could put on a page starting with that line, determine a |
| 788 | * cost function for each one, add it to the pre-computed cost |
| 789 | * function for optimally page-breaking everything after that |
| 790 | * page, and pick the best option. |
| 791 | * |
| 792 | * Since my line_data structures are only used for this |
| 793 | * purpose, I might as well just store the algorithm data |
| 794 | * directly in them. |
| 795 | */ |
| 796 | |
| 797 | for (l = last; l; l = l->prev) { |
| 798 | int minheight, text = 0, space = 0; |
| 799 | int cost; |
| 800 | |
| 801 | l->bestcost = -1; |
| 802 | for (m = l; m; m = m->next) { |
| 803 | if (m != l && m->page_break) |
| 804 | break; /* we've gone as far as we can */ |
| 805 | |
| 806 | if (m != l) |
| 807 | space += m->prev->space_after; |
| 808 | if (m != l || m->page_break) |
| 809 | space += m->space_before; |
| 810 | text += m->line_height; |
| 811 | minheight = text + space; |
| 812 | |
| 813 | if (m != l && minheight > page_height) |
| 814 | break; |
| 815 | |
| 816 | /* |
| 817 | * Compute the cost of this arrangement, as the square |
| 818 | * of the amount of wasted space on the page. |
| 819 | * Exception: if this is the last page before a |
| 820 | * mandatory break or the document end, we don't |
| 821 | * penalise a large blank area. |
| 822 | */ |
| 823 | if (m->next && !m->next->page_break) |
| 824 | { |
| 825 | int x = page_height - minheight; |
| 826 | int xf; |
| 827 | |
| 828 | xf = x & 0xFF; |
| 829 | x >>= 8; |
| 830 | |
| 831 | cost = x*x; |
| 832 | cost += (x * xf) >> 8; |
| 833 | } else |
| 834 | cost = 0; |
| 835 | |
| 836 | if (m->next && !m->next->page_break) { |
| 837 | cost += m->penalty_after; |
| 838 | cost += m->next->penalty_before; |
| 839 | } |
| 840 | |
| 841 | if (m->next && !m->next->page_break) |
| 842 | cost += m->next->bestcost; |
| 843 | if (l->bestcost == -1 || l->bestcost > cost) { |
| 844 | /* |
| 845 | * This is the best option yet for this starting |
| 846 | * point. |
| 847 | */ |
| 848 | l->bestcost = cost; |
| 849 | if (m->next && !m->next->page_break) |
| 850 | l->vshortfall = page_height - minheight; |
| 851 | else |
| 852 | l->vshortfall = 0; |
| 853 | l->text = text; |
| 854 | l->space = space; |
| 855 | l->page_last = m; |
| 856 | } |
| 857 | } |
| 858 | } |
| 859 | |
| 860 | /* |
| 861 | * Now go through the line list forwards and assemble the |
| 862 | * actual pages. |
| 863 | */ |
| 864 | ph = pt = NULL; |
| 865 | |
| 866 | l = first; |
| 867 | while (l) { |
| 868 | page_data *page; |
| 869 | int text, space; |
| 870 | |
| 871 | page = mknew(page_data); |
| 872 | page->next = NULL; |
| 873 | page->prev = pt; |
| 874 | if (pt) |
| 875 | pt->next = page; |
| 876 | else |
| 877 | ph = page; |
| 878 | pt = page; |
| 879 | |
| 880 | page->first_line = l; |
| 881 | page->last_line = l->page_last; |
| 882 | |
| 883 | page->first_text = page->last_text = NULL; |
| 884 | |
| 885 | page->first_xref = page->last_xref = NULL; |
| 886 | |
| 887 | /* |
| 888 | * Now assign a y-coordinate to each line on the page. |
| 889 | */ |
| 890 | text = space = 0; |
| 891 | for (l = page->first_line; l; l = l->next) { |
| 892 | if (l != page->first_line) |
| 893 | space += l->prev->space_after; |
| 894 | if (l != page->first_line || l->page_break) |
| 895 | space += l->space_before; |
| 896 | text += l->line_height; |
| 897 | |
| 898 | l->page = page; |
| 899 | l->ypos = text + space + |
| 900 | space * (float)page->first_line->vshortfall / |
| 901 | page->first_line->space; |
| 902 | |
| 903 | if (l == page->last_line) |
| 904 | break; |
| 905 | } |
| 906 | |
| 907 | l = page->last_line->next; |
| 908 | } |
| 909 | |
| 910 | return ph; |
| 911 | } |
| 912 | |
| 913 | static void add_string_to_page(page_data *page, int x, int y, |
| 914 | font_encoding *fe, int size, char *text) |
| 915 | { |
| 916 | text_fragment *frag; |
| 917 | |
| 918 | frag = mknew(text_fragment); |
| 919 | frag->next = NULL; |
| 920 | |
| 921 | if (page->last_text) |
| 922 | page->last_text->next = frag; |
| 923 | else |
| 924 | page->first_text = frag; |
| 925 | page->last_text = frag; |
| 926 | |
| 927 | frag->x = x; |
| 928 | frag->y = y; |
| 929 | frag->fe = fe; |
| 930 | frag->fontsize = size; |
| 931 | frag->text = dupstr(text); |
| 932 | } |
| 933 | |
| 934 | /* |
| 935 | * Returns the updated x coordinate. |
| 936 | */ |
| 937 | static int render_string(page_data *page, font_data *font, int fontsize, |
| 938 | int x, int y, wchar_t *str) |
| 939 | { |
| 940 | char *text; |
| 941 | int textpos, textwid, glyph; |
| 942 | font_encoding *subfont = NULL, *sf; |
| 943 | |
| 944 | text = mknewa(char, 1 + ustrlen(str)); |
| 945 | textpos = textwid = 0; |
| 946 | |
| 947 | while (*str) { |
| 948 | glyph = font->bmp[*str]; |
| 949 | |
| 950 | if (glyph == 0xFFFF) |
| 951 | continue; /* nothing more we can do here */ |
| 952 | |
| 953 | /* |
| 954 | * Find which subfont this character is going in. |
| 955 | */ |
| 956 | sf = font->subfont_map[glyph].subfont; |
| 957 | |
| 958 | if (!sf) { |
| 959 | int c; |
| 960 | |
| 961 | /* |
| 962 | * This character is not yet in a subfont. Assign one. |
| 963 | */ |
| 964 | if (font->latest_subfont->free_pos >= 0x100) |
| 965 | font->latest_subfont = new_font_encoding(font); |
| 966 | |
| 967 | c = font->latest_subfont->free_pos++; |
| 968 | if (font->latest_subfont->free_pos == 0x7F) |
| 969 | font->latest_subfont->free_pos = 0xA1; |
| 970 | |
| 971 | font->subfont_map[glyph].subfont = font->latest_subfont; |
| 972 | font->subfont_map[glyph].position = c; |
| 973 | font->latest_subfont->vector[c] = font->glyphs[glyph]; |
| 974 | font->latest_subfont->indices[c] = glyph; |
| 975 | font->latest_subfont->to_unicode[c] = *str; |
| 976 | |
| 977 | sf = font->latest_subfont; |
| 978 | } |
| 979 | |
| 980 | if (!subfont || sf != subfont) { |
| 981 | if (subfont) { |
| 982 | text[textpos] = '\0'; |
| 983 | add_string_to_page(page, x, y, subfont, fontsize, text); |
| 984 | x += textwid; |
| 985 | } else { |
| 986 | assert(textpos == 0); |
| 987 | } |
| 988 | textpos = 0; |
| 989 | subfont = sf; |
| 990 | } |
| 991 | |
| 992 | text[textpos++] = font->subfont_map[glyph].position; |
| 993 | textwid += font->widths[glyph] * fontsize; |
| 994 | |
| 995 | str++; |
| 996 | } |
| 997 | |
| 998 | if (textpos > 0) { |
| 999 | text[textpos] = '\0'; |
| 1000 | add_string_to_page(page, x, y, subfont, fontsize, text); |
| 1001 | x += textwid; |
| 1002 | } |
| 1003 | |
| 1004 | return x; |
| 1005 | } |
| 1006 | |
| 1007 | /* |
| 1008 | * Returns the updated x coordinate. |
| 1009 | */ |
| 1010 | static int render_text(page_data *page, para_data *pdata, line_data *ldata, |
| 1011 | int x, int y, word *text, word *text_end, xref **xr, |
| 1012 | int shortfall, int nspaces, int *nspace, |
| 1013 | keywordlist *keywords) |
| 1014 | { |
| 1015 | while (text && text != text_end) { |
| 1016 | int style, type, findex, errs; |
| 1017 | wchar_t *str; |
| 1018 | xref_dest dest; |
| 1019 | |
| 1020 | switch (text->type) { |
| 1021 | /* |
| 1022 | * Start a cross-reference. |
| 1023 | */ |
| 1024 | case word_HyperLink: |
| 1025 | case word_UpperXref: |
| 1026 | case word_LowerXref: |
| 1027 | |
| 1028 | if (text->type == word_HyperLink) { |
| 1029 | dest.type = URL; |
| 1030 | dest.url = utoa_dup(text->text); |
| 1031 | dest.page = NULL; |
| 1032 | } else { |
| 1033 | keyword *kwl = kw_lookup(keywords, text->text); |
| 1034 | para_data *pdata; |
| 1035 | |
| 1036 | if (kwl) { |
| 1037 | assert(kwl->para->private_data); |
| 1038 | pdata = (para_data *) kwl->para->private_data; |
| 1039 | dest.type = PAGE; |
| 1040 | dest.page = pdata->first->page; |
| 1041 | dest.url = NULL; |
| 1042 | } else { |
| 1043 | /* |
| 1044 | * Shouldn't happen, but *shrug* |
| 1045 | */ |
| 1046 | dest.type = NONE; |
| 1047 | dest.page = NULL; |
| 1048 | dest.url = NULL; |
| 1049 | } |
| 1050 | } |
| 1051 | if (dest.type != NONE) { |
| 1052 | *xr = mknew(xref); |
| 1053 | (*xr)->dest = dest; /* structure copy */ |
| 1054 | if (page->last_xref) |
| 1055 | page->last_xref->next = *xr; |
| 1056 | else |
| 1057 | page->first_xref = *xr; |
| 1058 | page->last_xref = *xr; |
| 1059 | |
| 1060 | /* |
| 1061 | * FIXME: Ideally we should have, and use, some |
| 1062 | * vertical font metric information here so that |
| 1063 | * our cross-ref rectangle can take account of |
| 1064 | * descenders and the font's cap height. This will |
| 1065 | * do for the moment, but it isn't ideal. |
| 1066 | */ |
| 1067 | (*xr)->lx = (*xr)->rx = x; |
| 1068 | (*xr)->by = y; |
| 1069 | (*xr)->ty = y + ldata->line_height; |
| 1070 | } |
| 1071 | goto nextword; |
| 1072 | |
| 1073 | /* |
| 1074 | * Finish extending a cross-reference box. |
| 1075 | */ |
| 1076 | case word_HyperEnd: |
| 1077 | case word_XrefEnd: |
| 1078 | *xr = NULL; |
| 1079 | goto nextword; |
| 1080 | |
| 1081 | case word_IndexRef: |
| 1082 | goto nextword; |
| 1083 | /* |
| 1084 | * FIXME: we should do something with this. |
| 1085 | */ |
| 1086 | } |
| 1087 | |
| 1088 | style = towordstyle(text->type); |
| 1089 | type = removeattr(text->type); |
| 1090 | |
| 1091 | findex = (style == word_Normal ? FONT_NORMAL : |
| 1092 | style == word_Emph ? FONT_EMPH : |
| 1093 | FONT_CODE); |
| 1094 | |
| 1095 | if (type == word_Normal) { |
| 1096 | str = text->text; |
| 1097 | } else if (type == word_WhiteSpace) { |
| 1098 | x += pdata->sizes[findex] * |
| 1099 | string_width(pdata->fonts[findex], L" ", NULL); |
| 1100 | if (nspaces && findex != FONT_CODE) { |
| 1101 | x += (*nspace+1) * shortfall / nspaces; |
| 1102 | x -= *nspace * shortfall / nspaces; |
| 1103 | (*nspace)++; |
| 1104 | } |
| 1105 | goto nextword; |
| 1106 | } else /* if (type == word_Quote) */ { |
| 1107 | if (text->aux == quote_Open) |
| 1108 | str = L"\x2018"; /* FIXME: configurability! */ |
| 1109 | else |
| 1110 | str = L"\x2019"; /* FIXME: configurability! */ |
| 1111 | } |
| 1112 | |
| 1113 | (void) string_width(pdata->fonts[findex], str, &errs); |
| 1114 | |
| 1115 | if (errs && text->alt) |
| 1116 | x = render_text(page, pdata, ldata, x, y, text->alt, NULL, |
| 1117 | xr, shortfall, nspaces, nspace, keywords); |
| 1118 | else |
| 1119 | x = render_string(page, pdata->fonts[findex], |
| 1120 | pdata->sizes[findex], x, y, str); |
| 1121 | |
| 1122 | if (*xr) |
| 1123 | (*xr)->rx = x; |
| 1124 | |
| 1125 | nextword: |
| 1126 | text = text->next; |
| 1127 | } |
| 1128 | |
| 1129 | return x; |
| 1130 | } |
| 1131 | |
| 1132 | static void render_line(line_data *ldata, int left_x, int top_y, |
| 1133 | xref_dest *dest, keywordlist *keywords) |
| 1134 | { |
| 1135 | int nspace; |
| 1136 | xref *xr; |
| 1137 | |
| 1138 | if (ldata->aux_text) { |
| 1139 | int x; |
| 1140 | xr = NULL; |
| 1141 | nspace = 0; |
| 1142 | x = render_text(ldata->page, ldata->pdata, ldata, |
| 1143 | left_x + ldata->aux_left_indent, |
| 1144 | top_y - ldata->ypos, |
| 1145 | ldata->aux_text, NULL, &xr, 0, 0, &nspace, keywords); |
| 1146 | if (ldata->aux_text_2) |
| 1147 | render_text(ldata->page, ldata->pdata, ldata, |
| 1148 | x, top_y - ldata->ypos, |
| 1149 | ldata->aux_text_2, NULL, &xr, 0, 0, &nspace, keywords); |
| 1150 | } |
| 1151 | nspace = 0; |
| 1152 | |
| 1153 | /* |
| 1154 | * There might be a cross-reference carried over from a |
| 1155 | * previous line. |
| 1156 | */ |
| 1157 | if (dest->type != NONE) { |
| 1158 | xr = mknew(xref); |
| 1159 | xr->dest = *dest; /* structure copy */ |
| 1160 | if (ldata->page->last_xref) |
| 1161 | ldata->page->last_xref->next = xr; |
| 1162 | else |
| 1163 | ldata->page->first_xref = xr; |
| 1164 | ldata->page->last_xref = xr; |
| 1165 | xr->lx = xr->rx = left_x + ldata->xpos; |
| 1166 | xr->by = top_y - ldata->ypos; |
| 1167 | xr->ty = top_y - ldata->ypos + ldata->line_height; |
| 1168 | } else |
| 1169 | xr = NULL; |
| 1170 | |
| 1171 | render_text(ldata->page, ldata->pdata, ldata, left_x + ldata->xpos, |
| 1172 | top_y - ldata->ypos, ldata->first, ldata->end, &xr, |
| 1173 | ldata->hshortfall, ldata->nspaces, &nspace, keywords); |
| 1174 | |
| 1175 | if (xr) { |
| 1176 | /* |
| 1177 | * There's a cross-reference continued on to the next line. |
| 1178 | */ |
| 1179 | *dest = xr->dest; |
| 1180 | } else |
| 1181 | dest->type = NONE; |
| 1182 | } |
| 1183 | |
| 1184 | static void code_paragraph(para_data *pdata, |
| 1185 | font_data *fn, font_data *fi, font_data *fb, |
| 1186 | int font_size, int indent, word *words) |
| 1187 | { |
| 1188 | /* |
| 1189 | * For code paragraphs, I'm going to hack grievously and |
| 1190 | * pretend the three normal fonts are the three code paragraph |
| 1191 | * fonts. |
| 1192 | */ |
| 1193 | pdata->fonts[FONT_NORMAL] = fb; |
| 1194 | pdata->fonts[FONT_EMPH] = fi; |
| 1195 | pdata->fonts[FONT_CODE] = fn; |
| 1196 | pdata->sizes[FONT_NORMAL] = |
| 1197 | pdata->sizes[FONT_EMPH] = |
| 1198 | pdata->sizes[FONT_CODE] = font_size; |
| 1199 | |
| 1200 | pdata->first = pdata->last = NULL; |
| 1201 | |
| 1202 | for (; words; words = words->next) { |
| 1203 | wchar_t *t, *e, *start; |
| 1204 | word *lhead = NULL, *ltail = NULL, *w; |
| 1205 | line_data *ldata; |
| 1206 | int prev = -1, curr; |
| 1207 | |
| 1208 | t = words->text; |
| 1209 | if (words->next && words->next->type == word_Emph) { |
| 1210 | e = words->next->text; |
| 1211 | words = words->next; |
| 1212 | } else |
| 1213 | e = NULL; |
| 1214 | |
| 1215 | start = t; |
| 1216 | |
| 1217 | while (*start) { |
| 1218 | while (*t) { |
| 1219 | if (!e || !*e) |
| 1220 | curr = 0; |
| 1221 | else if (*e == L'i') |
| 1222 | curr = 1; |
| 1223 | else if (*e == L'b') |
| 1224 | curr = 2; |
| 1225 | else |
| 1226 | curr = 0; |
| 1227 | |
| 1228 | if (prev < 0) |
| 1229 | prev = curr; |
| 1230 | |
| 1231 | if (curr != prev) |
| 1232 | break; |
| 1233 | |
| 1234 | t++; |
| 1235 | if (e && *e) |
| 1236 | e++; |
| 1237 | } |
| 1238 | |
| 1239 | /* |
| 1240 | * We've isolated a maximal subsequence of the line |
| 1241 | * which has the same emphasis. Form it into a word |
| 1242 | * structure. |
| 1243 | */ |
| 1244 | w = mknew(word); |
| 1245 | w->next = NULL; |
| 1246 | w->alt = NULL; |
| 1247 | w->type = (prev == 0 ? word_WeakCode : |
| 1248 | prev == 1 ? word_Emph : word_Normal); |
| 1249 | w->text = mknewa(wchar_t, t-start+1); |
| 1250 | memcpy(w->text, start, (t-start) * sizeof(wchar_t)); |
| 1251 | w->text[t-start] = '\0'; |
| 1252 | w->breaks = FALSE; |
| 1253 | |
| 1254 | if (ltail) |
| 1255 | ltail->next = w; |
| 1256 | else |
| 1257 | lhead = w; |
| 1258 | ltail = w; |
| 1259 | |
| 1260 | start = t; |
| 1261 | prev = -1; |
| 1262 | } |
| 1263 | |
| 1264 | ldata = mknew(line_data); |
| 1265 | |
| 1266 | ldata->pdata = pdata; |
| 1267 | ldata->first = lhead; |
| 1268 | ldata->end = NULL; |
| 1269 | ldata->line_height = font_size * 4096; |
| 1270 | |
| 1271 | ldata->xpos = indent; |
| 1272 | |
| 1273 | if (pdata->last) { |
| 1274 | pdata->last->next = ldata; |
| 1275 | ldata->prev = pdata->last; |
| 1276 | } else { |
| 1277 | pdata->first = ldata; |
| 1278 | ldata->prev = NULL; |
| 1279 | } |
| 1280 | ldata->next = NULL; |
| 1281 | pdata->last = ldata; |
| 1282 | |
| 1283 | ldata->hshortfall = 0; |
| 1284 | ldata->nspaces = 0; |
| 1285 | ldata->aux_text = NULL; |
| 1286 | ldata->aux_text_2 = NULL; |
| 1287 | ldata->aux_left_indent = 0; |
| 1288 | /* General opprobrium for breaking in a code paragraph. */ |
| 1289 | ldata->penalty_before = ldata->penalty_after = 50000; |
| 1290 | } |
| 1291 | } |