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Diffstat (limited to 'tex/context/base/mkiv/node-dir.lua')
-rw-r--r--tex/context/base/mkiv/node-dir.lua359
1 files changed, 58 insertions, 301 deletions
diff --git a/tex/context/base/mkiv/node-dir.lua b/tex/context/base/mkiv/node-dir.lua
index 59564ac93..3f0cba67e 100644
--- a/tex/context/base/mkiv/node-dir.lua
+++ b/tex/context/base/mkiv/node-dir.lua
@@ -6,304 +6,61 @@ if not modules then modules = { } end modules ['node-dir'] = {
license = "see context related readme files"
}
---[[
-<p>In the process of cleaning up the lua variant of the parbuilder
-we ran into a couple of functions (translated c macros) that were
-somewhat inefficient. More convenient is to use hashes although at
-the c-end still macros are used. In the process directions.h was
-adapted and now has the mappings as comments. This lua file is
-based on that file.
-]]--
-
-local allocate = utilities.storage.allocate
-
-local nodes = nodes
-
-nodes.is_mirrored = allocate {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
-}
-
-nodes.is_rotated = allocate { -- used
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- RTT = true, ["+RTT"] = true,
-}
-
-nodes.textdir_is_parallel = allocate { -- used
- TLT = {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
- TRT= {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
- LTL = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- RTT = true, ["+RTT"] = true,
- },
- RTT = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- RTT = true, ["+RTT"] = true,
- }
-}
-
-nodes.pardir_is_parallel = allocate {
- TLT = {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
- TRT = {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
- LTL = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- RTT = true, ["+RTT"] = true,
- },
- RTT = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- RTT = true, ["+RTT"] = true,
- },
-}
-
-nodes.pardir_is_opposite = allocate {
- TLT = {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- TRT = {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- LTL = {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- RTT = true, ["+RTT"] = true,
- },
- RTT = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- -- RTT = false,
- },
-}
-
-nodes.textdir_is_opposite = allocate { -- used
- TLT = {
- -- TLT = false,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
- TRT= {
- TLT = true, ["+TLT"] = true,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- LTL = {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- RTT = {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
-}
-
-nodes.glyphdir_is_opposite = allocate {
- TLT = {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- TRT= {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- LTL = {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- RTT = {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
-}
-
-nodes.pardir_is_equal = allocate { -- used
- TLT = {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
- TRT= {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
- LTL= {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- -- RTT = false,
- },
- RTT= {
- -- TLT = false,
- -- TRT = false,
- -- LTL = false,
- RTT = true, ["+RTT"] = true,
- },
-}
-
-nodes.textdir_is_equal = allocate { -- used
- TLT = {
- TLT = true, ["+TLT"] = true,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- TRT= {
- -- TLT = false,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
- LTL = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- RTT = true, ["+RTT"] = true,
- },
- RTT = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- RTT = true, ["+RTT"] = true,
- },
-}
-
-nodes.glyphdir_is_equal = allocate { -- used
- TLT = {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- RTT = true, ["+RTT"] = true,
- },
- TRT= {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- RTT = true, ["+RTT"] = true,
- },
- LTL = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- -- RTT = false,
- },
- RTT = {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- RTT = true, ["+RTT"] = true,
- },
-}
-
-nodes.partextdir_is_equal = allocate {
- TLT = {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- RTT = true, ["+RTT"] = true,
- },
- TRT= {
- -- TLT = false,
- -- TRT = false,
- LTL = true, ["+LTL"] = true,
- RTT = true, ["+RTT"] = true,
- },
- LTL = {
- TLT = true, ["+TLT"] = true,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
- },
- RTT = {
- -- TLT = false,
- TRT = true, ["+TRT"] = true,
- -- LTL = false,
- -- RTT = false,
- },
-}
-
-nodes.textdir_is_is = allocate {
- TLT = true, ["+TLT"] = true,
- -- TRT = false,
- -- LTL = false,
- -- RTT = false,
-}
-
-nodes.glyphdir_is_orthogonal = allocate {
- TLT = true, ["+TLT"] = true,
- TRT = true, ["+TRT"] = true,
- LTL = true, ["+LTL"] = true,
- -- RTT = false
-}
-
-nodes.dir_is_pop = allocate { -- used
- ["-TRT"] = true,
- ["-TLT"] = true,
- ["-LTL"] = true,
- ["-RTT"] = true,
-}
-
-nodes.dir_negation = allocate { -- used
- ["-TRT"] = "+TRT",
- ["-TLT"] = "+TLT",
- ["-LTL"] = "+LTL",
- ["-RTT"] = "+RTT",
- ["+TRT"] = "-TRT",
- ["+TLT"] = "-TLT",
- ["+LTL"] = "-LTL",
- ["+RTT"] = "-RTT",
-}
+-- This is experimental code, so when I change it I need to check other modules
+-- too.
+--
+-- Local par nodes are somewhat special. They start a paragraph and then register
+-- the par direction. But they can also show op mid paragraph in which case they
+-- register boxes and penalties. In that case the direction should not be affected.
+--
+-- We can assume that when hpack and prelinebreak filters are called, a local par
+-- still sits at the head, but after a linebreak pass this node can be after the
+-- leftskip (when present).
+
+local nodes = nodes
+local nuts = nodes.nuts
+
+local nodecodes = nodes.nodecodes
+local localpar_code = nodecodes.localpar
+
+local getid = nuts.getid
+local getsubtype = nuts.getsubtype
+local getdirection = nuts.getdirection
+
+local dirvalues = nodes.dirvalues
+local lefttoright = dirvalues.lefttoright
+local righttoleft = dirvalues.righttoleft
+
+local localparnewgraf_code = 0
+
+local function newstack(head,direction)
+ local stack = { }
+ local top = 0
+ if head and getid(head) == localpar_code and getsubtype(head) == localparnewgraf_code then
+ direction = getdirection(head)
+ end
+ if not direction then
+ direction = lefttoright
+ elseif direction == "TLT" then
+ direction = lefttoright
+ elseif direction == "TRT" then
+ direction = righttoleft
+ end
+ local function update(node)
+ local dir, pop = getdirection(node)
+ if not pop then
+ top = top + 1
+ stack[top] = dir
+ return dir
+ elseif top == 0 then
+ return direction
+ elseif top == 1 then
+ top = 0
+ return direction
+ else
+ top = top - 1
+ return stack[top]
+ end
+ end
+ return direction, update
+end
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