Copyright (c) 2008, 2009 jerome DOT laurens AT u-bourgogne DOT fr

This file is part of the SyncTeX package.

Latest Revision: Wed Jul  1 11:17:16 UTC 2009

License:
--------
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation
files (the "Software"), to deal in the Software without
restriction, including without limitation the rights to use,
copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following
conditions:

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE

Except as contained in this notice, the name of the copyright holder  
shall not be used in advertising or otherwise to promote the sale,  
use or other dealings in this Software without prior written  
authorization from the copyright holder.

Acknowledgments:
----------------
The author received useful remarks from the pdfTeX developers, especially Hahn The Thanh,
and significant help from XeTeX developer Jonathan Kew

Nota Bene:
----------
If you include or use a significant part of the synctex package into a software,
I would appreciate to be listed as contributor and see "SyncTeX" highlighted.

Version 1
Thu Jun 19 09:39:21 UTC 2008

Notice:
-------
This file contains TeX changes for core synctex support.
It is missing some implementation details that are deferred to either
sync-pdftex.ch or sync-xetex.ch
synctex.ch is based on tex.web after the eTeX changes have been applied.
So it might not apply as is to pdftex.web due to some typographical changes.
In the building process, one may have to apply some suitable tex.ch0 first.
See pdftexdir for details.

@x etex.ch l.3976
@<Reverse an hlist segment...@>=
begin save_h:=cur_h; temp_ptr:=link(p); rule_wd:=width(p);
free_node(p,small_node_size);
@y
@<Reverse an hlist segment...@>=
begin save_h:=cur_h; temp_ptr:=link(p); rule_wd:=width(p);
free_node(p,medium_node_size); {{\sl Sync\TeX}: p is a |math_node|}
@z

@x etex.ch l.4036
if type(p)=kern_node then if (rule_wd=0)or(l=null) then
  begin free_node(p,small_node_size); p:=l;
  end;
@y
if type(p)=kern_node then if (rule_wd=0)or(l=null) then
  begin free_node(p,medium_node_size); p:=l;
  end;
@z

@x etex.ch l.4088
@<Finish the reversed...@>=
begin free_node(p,small_node_size);
link(t):=q; width(t):=rule_wd; edge_dist(t):=-cur_h-rule_wd; goto done;
end
@y
@<Finish the reversed...@>=
begin free_node(p,medium_node_size); {{\sl Sync\TeX}: p is a |kern_node|}
link(t):=q; width(t):=rule_wd; edge_dist(t):=-cur_h-rule_wd; goto done;
end
@z

@x etex.ch l.4137
  kern_node,math_node: begin r:=get_node(small_node_size);
    words:=small_node_size;
    end;
  glue_node: begin r:=get_node(small_node_size); add_glue_ref(glue_ptr(p));
    glue_ptr(r):=glue_ptr(p); leader_ptr(r):=null;
    end;
@y
  kern_node,math_node: begin
      words:=medium_node_size; {{\sl Sync\TeX}: proper size for math and kern}
      r:=get_node(words);
    end;
  glue_node: begin r:=get_node(medium_node_size); add_glue_ref(glue_ptr(p));
                                                 {{\sl Sync\TeX}: proper size for glue}
    glue_ptr(r):=glue_ptr(p); leader_ptr(r):=null;
    end;
@z

@x etex.ch l.4211 - Drop unused label
procedure just_reverse(@!p:pointer);
label found,done;
@y
procedure just_reverse(@!p:pointer);
label done;
@z

@x etex.ch l.4234
found:width(t):=width(p); link(t):=q; free_node(p,small_node_size);
@y
width(t):=width(p); link(t):=q; free_node(p,small_node_size);
@z

@x etex.ch l.4241
    begin type(p):=kern_node; incr(LR_problems);
    end
  else  begin pop_LR;
    if n>min_halfword then
      begin decr(n); decr(subtype(p)); {change |after| into |before|}
      end
    else  begin if m>min_halfword then decr(m)@+else goto found;
      type(p):=kern_node;
      end;
    end
else  begin push_LR(p);
  if (n>min_halfword)or(LR_dir(p)<>cur_dir) then
    begin incr(n); incr(subtype(p)); {change |before| into |after|}
    end
  else  begin type(p):=kern_node; incr(m);
    end;
  end
@y
    begin type(p):=kern_node; incr(LR_problems);
        {{\sl Sync\TeX} node size watch point: |math_node| size == |kern_node| size}
    end
  else  begin pop_LR;
    if n>min_halfword then
      begin decr(n); decr(subtype(p)); {change |after| into |before|}
      end
    else  begin if m>min_halfword then decr(m)@+else begin
    width(t):=width(p); link(t):=q; free_node(p,medium_node_size);
{{\sl Sync\TeX}: no more "goto found", and proper node size}
    goto done;
  end;
  type(p):=kern_node;
            {{\sl Sync\TeX} node size watch point: |math_node| size == |kern_node| size}
      end;
    end
else  begin push_LR(p);
  if (n>min_halfword)or(LR_dir(p)<>cur_dir) then
    begin incr(n); incr(subtype(p)); {change |before| into |after|}
    end
  else  begin type(p):=kern_node; incr(m);
            {{\sl Sync\TeX} node size watch point: |math_node| size == |kern_node| size}
    end;
  end
@z