File: pdfaction.w

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% pdfaction.w
%
% Copyright 2009-2011 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"

@ read an action specification

@c halfword scan_action(PDF pdf)
{
    int p = new_node(whatsit_node, pdf_action_node);
    (void) pdf;
    if (scan_keyword("user"))
        set_pdf_action_type(p, pdf_action_user);
    else if (scan_keyword("goto"))
        set_pdf_action_type(p, pdf_action_goto);
    else if (scan_keyword("thread"))
        set_pdf_action_type(p, pdf_action_thread);
    else
        normal_error("pdf backend", "action type missing");
    if (pdf_action_type(p) == pdf_action_user) {
        scan_toks(false, true);
        set_pdf_action_tokens(p, def_ref);
        return p;
    }
    if (scan_keyword("file")) {
        scan_toks(false, true);
        set_pdf_action_file(p, def_ref);
    }
    if (scan_keyword("page")) {
        if (pdf_action_type(p) != pdf_action_goto)
            normal_error("pdf backend", "only GoTo action can be used with 'page'");
        set_pdf_action_type(p, pdf_action_page);
        scan_int();
        if (cur_val <= 0)
            normal_error("pdf backend", "page number must be positive");
        set_pdf_action_id(p, cur_val);
        set_pdf_action_named_id(p, 0);
        scan_toks(false, true);
        set_pdf_action_tokens(p, def_ref);
    } else if (scan_keyword("name")) {
        scan_toks(false, true);
        set_pdf_action_named_id(p, 1);
        set_pdf_action_id(p, def_ref);
    } else if (scan_keyword("num")) {
        if ((pdf_action_type(p) == pdf_action_goto) &&
            (pdf_action_file(p) != null))
            normal_error("pdf backend", "'goto' option cannot be used with both 'file' and 'num'");
        scan_int();
        if (cur_val <= 0)
            normal_error("pdf backend", "num identifier must be positive");
        set_pdf_action_named_id(p, 0);
        set_pdf_action_id(p, cur_val);
    } else {
        normal_error("pdf backend", "identifier type missing");
    }
    if (scan_keyword("newwindow")) {
        set_pdf_action_new_window(p, pdf_window_new);
        /* Scan an optional space */
        get_x_token();
        if (cur_cmd != spacer_cmd)
            back_input();
    } else if (scan_keyword("nonewwindow")) {
        set_pdf_action_new_window(p, pdf_window_nonew);
        /* Scan an optional space */
        get_x_token();
        if (cur_cmd != spacer_cmd)
            back_input();
    } else {
        set_pdf_action_new_window(p, pdf_window_notset);
    }
    if ((pdf_action_new_window(p) > pdf_window_notset) &&
        (((pdf_action_type(p) != pdf_action_goto) &&
          (pdf_action_type(p) != pdf_action_page)) ||
         (pdf_action_file(p) == null)))
        normal_error("pdf backend","'newwindow' or 'nonewwindow' must be used with 'goto' and 'file' option");
    return p;
}

@ write an action specification

@c void write_action(PDF pdf, halfword p)
{
    char *s;
    int d = 0;
    if (pdf_action_type(p) == pdf_action_user) {
        pdf_out(pdf, '\n');
        pdf_print_toks(pdf, pdf_action_tokens(p));
        pdf_out(pdf, '\n');
        return;
    }
    pdf_begin_dict(pdf);
    if (pdf_action_file(p) != null) {
        pdf_add_name(pdf, "F");
        pdf_out(pdf, ' ');
        s = tokenlist_to_cstring(pdf_action_file(p), true, NULL);
        pdf_print_str(pdf, s);
        xfree(s);
        pdf_out(pdf, ' ');
        if (pdf_action_new_window(p) > pdf_window_notset) {
            if (pdf_action_new_window(p) == pdf_window_new)
                pdf_dict_add_bool(pdf, "NewWindow", 1);
            else
                pdf_dict_add_bool(pdf, "NewWindow", 0);
        }
    }
    switch (pdf_action_type(p)) {
        case pdf_action_page:
            pdf_dict_add_name(pdf, "S", "GoTo");
            if (pdf_action_file(p) == null) {
                pdf_add_name(pdf, "D");
                pdf_begin_array(pdf);
                pdf_add_ref(pdf, pdf_get_obj(pdf, obj_type_page, pdf_action_id(p), false));
            } else {
                pdf_add_name(pdf, "D");
                pdf_begin_array(pdf);
                pdf_print_int(pdf, pdf_action_id(p) - 1);
            }
            {
                char *tokstr = tokenlist_to_cstring(pdf_action_tokens(p), true, NULL);
                pdf_printf(pdf, " %s", tokstr);
                pdf_end_array(pdf);
                xfree(tokstr);
            }
            break;
        case pdf_action_goto:
            if (pdf_action_file(p) == null) {
                pdf_dict_add_name(pdf, "S", "GoTo");
                d = pdf_get_obj(pdf, obj_type_dest, pdf_action_id(p), pdf_action_named_id(p));
            } else
                pdf_dict_add_name(pdf, "S", "GoToR");
            if (pdf_action_named_id(p) > 0) {
                char *tokstr = tokenlist_to_cstring(pdf_action_id(p), true, NULL);
                pdf_dict_add_string(pdf, "D", tokstr);
                xfree(tokstr);
            } else if (pdf_action_file(p) == null) {
                pdf_dict_add_ref(pdf, "D", d);
            } else {
                normal_error("pdf backend","'goto' option cannot be used with both 'file' and 'num'");
            }
            break;
        case pdf_action_thread:
            pdf_dict_add_name(pdf, "S", "Thread");
            if (pdf_action_file(p) == null) {
                d = pdf_get_obj(pdf, obj_type_thread, pdf_action_id(p), pdf_action_named_id(p));
                if (pdf_action_named_id(p) > 0) {
                    char *tokstr = tokenlist_to_cstring(pdf_action_id(p), true, NULL);
                    pdf_dict_add_string(pdf, "D", tokstr);
                    xfree(tokstr);
                } else if (pdf_action_file(p) == null) {
                    pdf_dict_add_ref(pdf, "D", d);
                } else {
                    pdf_dict_add_int(pdf, "D", pdf_action_id(p));
                }
            }
            break;
    }
    pdf_end_dict(pdf);
}