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% pdfliteral.w
%
% Copyright 2009-2010 Taco Hoekwater <taco@@luatex.org>
%
% This file is part of LuaTeX.
%
% LuaTeX 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 2 of the License, or (at your
% option) any later version.
%
% LuaTeX 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 Lesser General Public
% License for more details.
%
% You should have received a copy of the GNU General Public License along
% with LuaTeX; if not, see <http://www.gnu.org/licenses/>.
@ @c
#include "ptexlib.h"
@ @c
void pdf_special(PDF pdf, halfword p)
{
int old_setting = selector;
str_number s;
selector = new_string;
show_token_list(token_link(write_tokens(p)), null, -1);
selector = old_setting;
s = make_string();
pdf_literal(pdf, s, scan_special, true);
flush_str(s);
}
@ To ship out a \TeX\ box to PDF page description we need to implement
|hlist_out|, |vlist_out| and |ship_out|, which are equivalent to the \TeX'
original |hlist_out|, |vlist_out| and |ship_out| resp. But first we need to
declare some procedures needed in |hlist_out| and |vlist_out|.
@c
void pdf_out_literal(PDF pdf, halfword p)
{
int old_setting; /* holds print |selector| */
str_number s;
pdfstructure *ps = pdf->pstruct;
if (pdf_literal_type(p) == normal) {
old_setting = selector;
selector = new_string;
show_token_list(token_link(pdf_literal_data(p)), null, -1);
selector = old_setting;
s = make_string();
pdf_literal(pdf, s, pdf_literal_mode(p), false);
flush_str(s);
} else {
switch (pdf_literal_mode(p)) {
case set_origin:
pdf_goto_pagemode(pdf);
pdf_set_pos(pdf, pdf->posstruct->pos);
break;
case direct_page:
pdf_goto_pagemode(pdf);
break;
case direct_always:
pdf_end_string_nl(pdf);
ps->need_tm = true;
break;
default:
normal_error("pdf backend","bad literal mode");
break;
}
lua_pdf_literal(pdf, pdf_literal_data(p));
}
}
@ test equality of start of strings
@c
static boolean str_in_cstr(str_number s, const char *r, unsigned i)
{
const unsigned char *k, *l;
if ((unsigned) str_length(s) < i + strlen(r))
return false;
k = (const unsigned char *) r;
l = str_string(s) + i;
while ((*l) && (*k)) {
if (*l++ != *k++)
return false;
}
return true;
}
@ @c
void pdf_literal(PDF pdf, str_number s, int literal_mode, boolean warn)
{
unsigned char *ss;
size_t l;
pool_pointer j = 0; /* current character code position, initialized to make the compiler happy */
pdfstructure *p = pdf->pstruct;
if (s >= STRING_OFFSET) {
/* needed for |out_save| */
j = 0;
/* the next is obsolete, in fact, specials are obsolete in pdf mode */
if (literal_mode == scan_special) {
if (!(str_in_cstr(s, "PDF:", 0) || str_in_cstr(s, "pdf:", 0))) {
if (warn && ((!(str_in_cstr(s, "SRC:", 0) || str_in_cstr(s, "src:", 0))) || (str_length(s) == 0)))
tprint_nl("Non-PDF special ignored!");
return;
}
j = j + (pool_pointer) strlen("PDF:");
if (str_in_cstr(s, "direct:", strlen("PDF:"))) {
j = j + (pool_pointer) strlen("direct:");
literal_mode = direct_always;
} else if (str_in_cstr(s, "page:", strlen("PDF:"))) {
j = j + (pool_pointer) strlen("page:");
literal_mode = direct_page;
} else {
literal_mode = set_origin;
}
}
}
switch (literal_mode) {
case set_origin:
pdf_goto_pagemode(pdf);
pdf_set_pos(pdf, pdf->posstruct->pos);
break;
case direct_page:
pdf_goto_pagemode(pdf);
break;
case direct_always:
pdf_end_string_nl(pdf);
p->need_tm = true;
break;
default:
normal_error("pdf backend","bad literal mode");
break;
}
if (s >= STRING_OFFSET) {
ss = str_string(s);
l = str_length(s) - (size_t) j;
pdf_out_block(pdf, (const char *) (ss + j), l);
} else {
pdf_out(pdf, s);
}
pdf_out(pdf, '\n');
}
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