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-rw-r--r--Master/texmf-dist/tex/luatex/luatexja/ltj-lineskip.lua116
1 files changed, 116 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/luatex/luatexja/ltj-lineskip.lua b/Master/texmf-dist/tex/luatex/luatexja/ltj-lineskip.lua
new file mode 100644
index 00000000000..f5c439e559d
--- /dev/null
+++ b/Master/texmf-dist/tex/luatex/luatexja/ltj-lineskip.lua
@@ -0,0 +1,116 @@
+--
+-- ltj-lineskip.lua
+--
+luatexja.load_module('base'); local ltjb = luatexja.base
+luatexja.load_module('direction'); local ltjd = luatexja.direction
+luatexja.lineskip = luatexja.lineskip or {}
+
+local to_direct = node.direct.todirect
+local ltjl = luatexja.lineskip
+local id_glue = node.id('glue')
+local id_penalty = node.id('penalty')
+local id_hlist = node.id('hlist')
+local setfield = node.direct.setfield
+local getfield = node.direct.getfield
+local getlist = node.direct.getlist
+local node_new = node.direct.new
+local node_prev = node.direct.getprev
+local node_next = node.direct.getnext
+local getid = node.direct.getid
+local getsubtype = node.direct.getsubtype
+
+local node_getglue = node.getglue
+local setglue = node.direct.setglue
+local function copy_glue (new_glue, old_glue, subtype, new_w)
+ setfield(new_glue, 'subtype', subtype)
+ local w,st,sp,sto,spo = node_getglue(old_glue)
+ setglue(new_glue, new_w or w, st, sp, sto, spo)
+end
+ltjl.copy_glue = copy_glue
+
+function ltjl.p_dummy(before, after)
+ return nil, 0
+end
+function ltjl.l_dummy(dist, g, adj, normal, bw, loc)
+ if dist < tex.lineskiplimit then
+ copy_glue(g, tex.lineskip, 1, tex.lineskip.width + adj)
+ else
+ copy_glue(g, tex.baselineskip, 2, normal)
+ end
+end
+
+local ltj_profiler, ltj_skip = ltjl.p_dummy, ltjl.l_dummy
+function ltjl.setting(profiler, skip_method)
+ ltj_profiler = ltjl['p_'..tostring(profiler)] or ltjl.p_dummy
+ ltj_skip = ltjl['l_'..tostring(skip_method)] or ltjl.l_dummy
+end
+
+do
+ local traverse_id = node.direct.traverse_id
+ local function adjust_glue(nh)
+ local h = to_direct(nh)
+ local bw = tex.baselineskip.width
+ for x in traverse_id(id_glue, h) do
+ local xs = getsubtype(x)
+ if (xs==1) or (xs==2) then
+ local p, n = node_prev(x), node_next(x)
+ if p then
+ local pid = getid(p)
+ while (id_glue<=pid) and (pid<=id_penalty) and node_prev(p) do
+ p = node_prev(p); pid = getid(p)
+ end
+ if pid==id_hlist and getid(n)==id_hlist then
+ local normal = bw - getfield(p, 'depth') - getfield(n, 'height')
+ local lmin, adj = ltj_profiler(p, n, false, bw)
+ ltj_skip(lmin or normal, x, adj, normal, bw)
+ end
+ end
+ end
+ end
+ return true
+ end
+ ltjb.add_to_callback('post_linebreak_filter',
+ adjust_glue, 'ltj.lineskip', 10000)
+end
+
+do
+ local p_dummy = ltjl.p_dummy
+ local make_dir_whatsit = luatexja.direction.make_dir_whatsit
+ local get_dir_count = luatexja.direction.get_dir_count
+ local node_write = node.direct.write
+
+ local function dir_adjust_append_vlist(b, loc, prev, mirrored)
+ local old_b = to_direct(b)
+ local new_b = loc=='box' and
+ make_dir_whatsit(old_b, old_b, get_dir_count(), 'append_vlist') or old_b
+ if prev > -65536000 then
+ local bw = tex.baselineskip.width
+ local normal = bw - prev
+ - getfield(new_b, mirrored and 'depth' or 'height')
+ local lmin, adj = nil, 0
+ local tail = to_direct(tex.nest[tex.nest.ptr].tail)
+ if p_dummy~=ltj_profiler then
+ while tail and (id_glue<=getid(tail)) and (getid(tail)<=id_penalty) do
+ tail = node_prev(tail)
+ end
+ end
+ if tail then
+ if getid(tail)==id_hlist and getid(new_b)==id_hlist then
+ if getfield(tail, 'depth')==prev then
+ lmin, adj = ltj_profiler(tail, new_b, mirrored, bw)
+ end
+ end
+ end
+ local g = node_new(id_glue)
+ ltj_skip(lmin or normal, g, adj, normal, bw, loc)
+ node_write(g)
+ end
+ node_write(new_b)
+ tex.prevdepth = getfield(new_b, mirrored and 'height' or 'depth')
+ return nil -- do nothing on tex side
+ end
+ ltjb.add_to_callback('append_to_vlist_filter',
+ dir_adjust_append_vlist,
+ 'ltj.lineskip', 10000)
+end
+