source/texk/web2c/luatexdir/pdf/pdfliteral.w

   1 % pdfliteral.w
   2 %
   3 % Copyright 2009-2010 Taco Hoekwater <taco@@luatex.org>
   4 %
   5 % This file is part of LuaTeX.
   6 %
   7 % LuaTeX is free software; you can redistribute it and/or modify it under
   8 % the terms of the GNU General Public License as published by the Free
   9 % Software Foundation; either version 2 of the License, or (at your
  10 % option) any later version.
  11 %
  12 % LuaTeX is distributed in the hope that it will be useful, but WITHOUT
  13 % ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 % FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  15 % License for more details.
  16 %
  17 % You should have received a copy of the GNU General Public License along
  18 % with LuaTeX; if not, see <http://www.gnu.org/licenses/>.
  19
  20 @ @c
  21
  22 #include "ptexlib.h"
  23
  24 @ @c
  25 void pdf_special(PDF pdf, halfword p)
  26 {
  27     int old_setting = selector;
  28     str_number s;
  29     selector = new_string;
  30     show_token_list(token_link(write_tokens(p)), null, -1);
  31     selector = old_setting;
  32     s = make_string();
  33     pdf_literal(pdf, s, scan_special, true);
  34     flush_str(s);
  35 }
  36
  37 @ To ship out a \TeX\ box to PDF page description we need to implement
  38 |hlist_out|, |vlist_out| and |ship_out|, which are equivalent to the \TeX'
  39 original |hlist_out|, |vlist_out| and |ship_out| resp. But first we need to
  40 declare some procedures needed in |hlist_out| and |vlist_out|.
  41
  42 @c
  43 void pdf_out_literal(PDF pdf, halfword p)
  44 {
  45     int old_setting;            /* holds print |selector| */
  46     str_number s;
  47     pdfstructure *ps = pdf->pstruct;
  48     if (pdf_literal_type(p) == normal) {
  49         old_setting = selector;
  50         selector = new_string;
  51         show_token_list(token_link(pdf_literal_data(p)), null, -1);
  52         selector = old_setting;
  53         s = make_string();
  54         pdf_literal(pdf, s, pdf_literal_mode(p), false);
  55         flush_str(s);
  56     } else {
  57         switch (pdf_literal_mode(p)) {
  58             case set_origin:
  59                 pdf_goto_pagemode(pdf);
  60                 pdf_set_pos(pdf, pdf->posstruct->pos);
  61                 break;
  62             case direct_page:
  63                 pdf_goto_pagemode(pdf);
  64                 break;
  65             case direct_always:
  66                 pdf_end_string_nl(pdf);
  67                 ps->need_tm = true;
  68                 break;
  69             default:
  70                 normal_error("pdf backend","bad literal mode");
  71                 break;
  72         }
  73         lua_pdf_literal(pdf, pdf_literal_data(p));
  74     }
  75 }
  76
  77 @ test equality of start of strings
  78 @c
  79 static boolean str_in_cstr(str_number s, const char *r, unsigned i)
  80 {
  81     const unsigned char *k, *l;
  82     if ((unsigned) str_length(s) < i + strlen(r))
  83         return false;
  84     k = (const unsigned char *) r;
  85     l = str_string(s) + i;
  86     while ((*l) && (*k)) {
  87         if (*l++ != *k++)
  88             return false;
  89     }
  90     return true;
  91 }
  92
  93 @ @c
  94 void pdf_literal(PDF pdf, str_number s, int literal_mode, boolean warn)
  95 {
  96     unsigned char *ss;
  97     size_t l;
  98     pool_pointer j = 0;         /* current character code position, initialized to make the compiler happy */
  99     pdfstructure *p = pdf->pstruct;
 100     if (s >= STRING_OFFSET) {
 101         /* needed for |out_save| */
 102         j = 0;
 103         /* the next is obsolete, in fact, specials are obsolete in pdf mode */
 104         if (literal_mode == scan_special) {
 105             if (!(str_in_cstr(s, "PDF:", 0) || str_in_cstr(s, "pdf:", 0))) {
 106                 if (warn && ((!(str_in_cstr(s, "SRC:", 0) || str_in_cstr(s, "src:", 0))) || (str_length(s) == 0)))
 107                     tprint_nl("Non-PDF special ignored!");
 108                 return;
 109             }
 110             j = j + (pool_pointer) strlen("PDF:");
 111             if (str_in_cstr(s, "direct:", strlen("PDF:"))) {
 112                 j = j + (pool_pointer) strlen("direct:");
 113                 literal_mode = direct_always;
 114             } else if (str_in_cstr(s, "page:", strlen("PDF:"))) {
 115                 j = j + (pool_pointer) strlen("page:");
 116                 literal_mode = direct_page;
 117             } else {
 118                 literal_mode = set_origin;
 119             }
 120         }
 121     }
 122     switch (literal_mode) {
 123         case set_origin:
 124             pdf_goto_pagemode(pdf);
 125             pdf_set_pos(pdf, pdf->posstruct->pos);
 126             break;
 127         case direct_page:
 128             pdf_goto_pagemode(pdf);
 129             break;
 130         case direct_always:
 131             pdf_end_string_nl(pdf);
 132             p->need_tm = true;
 133             break;
 134         default:
 135             normal_error("pdf backend","bad literal mode");
 136             break;
 137     }
 138     if (s >= STRING_OFFSET) {
 139         ss = str_string(s);
 140         l = str_length(s) - (size_t) j;
 141         pdf_out_block(pdf, (const char *) (ss + j), l);
 142     } else {
 143         pdf_out(pdf, s);
 144     }
 145     pdf_out(pdf, '\n');
 146 }