diff options
Diffstat (limited to 'Build/source/texk/web2c/ptexdir/ptex-base.ch')
-rw-r--r-- | Build/source/texk/web2c/ptexdir/ptex-base.ch | 47 |
1 files changed, 41 insertions, 6 deletions
diff --git a/Build/source/texk/web2c/ptexdir/ptex-base.ch b/Build/source/texk/web2c/ptexdir/ptex-base.ch index 3ce08faa52f..8e1a633185d 100644 --- a/Build/source/texk/web2c/ptexdir/ptex-base.ch +++ b/Build/source/texk/web2c/ptexdir/ptex-base.ch @@ -346,7 +346,7 @@ In p\TeX\ the |subtype| field records the box direction |box_dir|. @# @d box_dir(#) == (qo(subtype(#))) {direction of a box} @d set_box_dir(#) == subtype(#):=set_box_dir_end -@d set_box_dir_end(#) == (qi(#)) +@d set_box_dir_end(#) == qi(#) @# @d dir_default = 0 {direction of the box, default Left to Right} @d dir_dtou = 1 {direction of the box, Bottom to Top} @@ -1985,12 +1985,33 @@ else begin qx:=q; end; @z +@x [26.424] l.8508 - pTeX: disp_node +legal in similar contexts. +@y +legal in similar contexts. + +The macro |find_effective_tail_pTeX| sets |tx| to the last non-|disp_node| +of the current list. +@z + @x [26.424] l.8510 - pTeX: disp_node @<Fetch an item in the current node...@>= @y -@d find_effective_tail_pTeX== {sets |tx| to last non-|disp_node|} +@d find_effective_tail_pTeX== tx:=tail; -if not is_char_node(tx) then if type(tx)=disp_node then tx:=prev_node +if not is_char_node(tx) then + if type(tx)=disp_node then + begin tx:=prev_node; + if not is_char_node(tx) then + if type(tx)=disp_node then {|disp_node| from a discretionary} + begin tx:=head; q:=link(head); + while q<>prev_node do + begin if is_char_node(q) then tx:=q + else if type(q)<>disp_node then tx:=q; + end; + q:=link(q); + end; + end @# @d find_effective_tail==find_effective_tail_pTeX @@ -4662,6 +4683,15 @@ since |head| is a one-word node. @x [47.1080] l.20940 - pTeX: disp_node @<If the current list ends with a box node, delete it...@>= @y +@d check_effective_tail_pTeX(#)== +tx:=tail; +if not is_char_node(tx) then + if type(tx)=disp_node then + begin tx:=prev_node; + if not is_char_node(tx) then + if type(tx)=disp_node then #; {|disp_node| from a discretionary} + end +@# @d fetch_effective_tail_pTeX(#)== {extract |tx|, merge |disp_node| pair} q:=head; p:=null; disp:=0; pdisp:=0; repeat r:=p; p:=q; fd:=false; @@ -4682,6 +4712,7 @@ else if fd then {|r|$\to$|p=disp_node|$\to$|q=disp_node|} end else prev_node:=p @# +@d check_effective_tail==check_effective_tail_pTeX @d fetch_effective_tail==fetch_effective_tail_pTeX @<If the current list ends with a box node, delete it...@>= @@ -4690,11 +4721,15 @@ else prev_node:=p @x [47.1080] l.20950 - pTeX: disp_node, check head=tail else begin if not is_char_node(tail) then if (type(tail)=hlist_node)or(type(tail)=vlist_node) then + @<Remove the last box, unless it's part of a discretionary@>; + end; @y -else begin find_effective_tail; +else begin check_effective_tail(goto done); if not is_char_node(tx)and(head<>tx) then if (type(tx)=hlist_node)or(type(tx)=vlist_node) or(type(tx)=dir_node) then + @<Remove the last box, unless it's part of a discretionary@>; + done:end; @z @x [47.1081] l.20957 - pTeX: disp_node @@ -4719,7 +4754,7 @@ if type(cur_box)=dir_node then end else if box_dir(cur_box)=dir_default then set_box_dir(cur_box)(abs(direction)); -done:end +end @z @x [47.1083] l.20989 - pTeX: adjust_dir @@ -4933,7 +4968,7 @@ else begin if not is_char_node(tail) then if type(tail)=cur_chr then until q=tail; link(p):=null; flush_node_list(tail); tail:=p; @y -else begin find_effective_tail; +else begin check_effective_tail(return); if not is_char_node(tx) then if type(tx)=cur_chr then begin fetch_effective_tail(return); flush_node_list(tx); |