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Diffstat (limited to 'tex/context/base/typo-dir.lua')
-rw-r--r--tex/context/base/typo-dir.lua926
1 files changed, 463 insertions, 463 deletions
diff --git a/tex/context/base/typo-dir.lua b/tex/context/base/typo-dir.lua
index 7e5f8c2d3..f02395475 100644
--- a/tex/context/base/typo-dir.lua
+++ b/tex/context/base/typo-dir.lua
@@ -1,463 +1,463 @@
-if not modules then modules = { } end modules ['typo-dir'] = {
- version = 1.001,
- comment = "companion to typo-dir.mkiv",
- author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
- copyright = "PRAGMA ADE / ConTeXt Development Team",
- license = "see context related readme files"
-}
-
--- todo: also use end_of_math here?
-
-local next, type = next, type
-local format, insert, sub, find, match = string.format, table.insert, string.sub, string.find, string.match
-local utfchar = utf.char
-
--- vertical space handler
-
-local nodes, node = nodes, node
-
-local trace_directions = false trackers.register("typesetters.directions", function(v) trace_directions = v end)
-
-local report_directions = logs.reporter("typesetting","directions")
-
-local traverse_id = node.traverse_id
-local insert_node_before = node.insert_before
-local insert_node_after = node.insert_after
-local remove_node = nodes.remove
-
-local texattribute = tex.attribute
-local unsetvalue = attributes.unsetvalue
-
-local nodecodes = nodes.nodecodes
-local whatcodes = nodes.whatcodes
-local mathcodes = nodes.mathcodes
-
-local tasks = nodes.tasks
-
-local glyph_code = nodecodes.glyph
-local whatsit_code = nodecodes.whatsit
-local math_code = nodecodes.math
-
-local localpar_code = whatcodes.localpar
-local dir_code = whatcodes.dir
-
-local nodepool = nodes.pool
-
-local new_textdir = nodepool.textdir
-
-local beginmath_code = mathcodes.beginmath
-local endmath_code = mathcodes.endmath
-
-local fonthashes = fonts.hashes
-local fontdata = fonthashes.identifiers
-local fontchar = fonthashes.characters
-
-local chardata = characters.data
-local chardirs = characters.directions -- maybe make a special mirror table
-
---~ Analysis by Idris:
---~
---~ 1. Assuming the reading- vs word-order distinction (bidi-char types) is governing;
---~ 2. Assuming that 'ARAB' represents an actual arabic string in raw input order, not word-order;
---~ 3. Assuming that 'BARA' represent the correct RL word order;
---~
---~ Then we have, with input: LATIN ARAB
---~
---~ \textdir TLT LATIN ARAB => LATIN BARA
---~ \textdir TRT LATIN ARAB => LATIN BARA
---~ \textdir TRT LRO LATIN ARAB => LATIN ARAB
---~ \textdir TLT LRO LATIN ARAB => LATIN ARAB
---~ \textdir TLT RLO LATIN ARAB => NITAL ARAB
---~ \textdir TRT RLO LATIN ARAB => NITAL ARAB
-
--- elseif d == "es" then -- European Number Separator
--- elseif d == "et" then -- European Number Terminator
--- elseif d == "cs" then -- Common Number Separator
--- elseif d == "nsm" then -- Non-Spacing Mark
--- elseif d == "bn" then -- Boundary Neutral
--- elseif d == "b" then -- Paragraph Separator
--- elseif d == "s" then -- Segment Separator
--- elseif d == "ws" then -- Whitespace
--- elseif d == "on" then -- Other Neutrals
-
-typesetters.directions = typesetters.directions or { }
-local directions = typesetters.directions
-
-local a_state = attributes.private('state')
-local a_directions = attributes.private('directions')
-
-local skipmath = true
-local strip = false
-
--- todo: delayed inserts here
--- todo: get rid of local functions here
-
--- beware, math adds whatsits afterwards so that will mess things up
-
-local finish, autodir, embedded, override, done = nil, 0, 0, 0, false
-local list, glyphs = nil, false
-local finished, finidir, finipos = nil, nil, 1
-local head, current, inserted = nil, nil, nil
-
-local function finish_auto_before()
- head, inserted = insert_node_before(head,current,new_textdir("-"..finish))
- finished, finidir = inserted, finish
- if trace_directions then
- insert(list,#list,format("auto finish inserted before: %s",finish))
- finipos = #list-1
- end
- finish, autodir, done = nil, 0, true
-end
-
-local function finish_auto_after()
- head, current = insert_node_after(head,current,new_textdir("-"..finish))
- finished, finidir = current, finish
- if trace_directions then
- list[#list+1] = format("auto finish inserted after: %s",finish)
- finipos = #list
- end
- finish, autodir, done = nil, 0, true
-end
-
-local function force_auto_left_before()
- if finish then
- finish_auto_before()
- end
- if embedded >= 0 then
- finish, autodir, done = "TLT", 1, true
- else
- finish, autodir, done = "TRT", -1, true
- end
- if finidir == finish then
- head = remove_node(head,finished,true)
- if trace_directions then
- list[finipos] = list[finipos] .. " (deleted afterwards)"
- insert(list,#list,format("start text dir %s (embedded: %s)",finish,embedded))
- end
- else
- head, inserted = insert_node_before(head,current,new_textdir("+"..finish))
- if trace_directions then
- insert(list,#list,format("start text dir %s (embedded: %s)",finish,embedded))
- end
- end
-end
-
-local function force_auto_right_before()
- if finish then
- finish_auto_before()
- end
- if embedded <= 0 then
- finish, autodir, done = "TRT", -1, true
- else
- finish, autodir, done = "TLT", 1, true
- end
- if finidir == finish then
- head = remove_node(head,finished,true)
- if trace_directions then
- list[finipos] = list[finipos] .. " (deleted afterwards)"
- insert(list,#list,format("start text dir %s (embedded: %s)",finish,embedded))
- end
- else
- head, inserted = insert_node_before(head,current,new_textdir("+"..finish))
- if trace_directions then
- insert(list,#list,format("start text dir %s (embedded: %s)",finish,embedded))
- end
- end
-end
-
--- todo: use new dir functions
-
-local s_isol = fonts.analyzers.states.isol
-
-function directions.process(namespace,attribute,start) -- todo: make faster
- if not start.next then
- return start, false
- end
- head, current, inserted = start, start, nil
- finish, autodir, embedded, override, done = nil, 0, 0, 0, false
- list, glyphs = trace_directions and { }, false
- finished, finidir, finipos = nil, nil, 1
- local stack, top, obsolete = { }, 0, { }
- local lro, rlo, prevattr, inmath = false, false, 0, false
- while current do
- local id = current.id
- if skipmath and id == math_code then
- local subtype = current.subtype
- if subtype == beginmath_code then
- inmath = true
- elseif subtype == endmath_code then
- inmath = false
- else
- -- todo
- end
- current = current.next
- elseif inmath then
- current = current.next
- else
- local attr = current[attribute]
- if attr and attr > 0 then
- -- current[attribute] = unsetvalue -- slow, needed?
- if attr == 1 then
- -- bidi parsing mode
- elseif attr ~= prevattr then
- -- no pop, grouped driven (2=normal,3=lro,4=rlo)
- if attr == 3 then
- if trace_directions then
- list[#list+1] = format("override right -> left (lro) (bidi=%s)",attr)
- end
- lro, rlo = true, false
- elseif attr == 4 then
- if trace_directions then
- list[#list+1] = format("override left -> right (rlo) (bidi=%s)",attr)
- end
- lro, rlo = false, true
- else
- if trace_directions and
- current ~= head then list[#list+1] = format("override reset (bidi=%s)",attr)
- end
- lro, rlo = false, false
- end
- prevattr = attr
- end
- end
- if id == glyph_code then
- glyphs = true
- if attr and attr > 0 then
- local char = current.char
- local d = chardirs[char]
- if rlo or override > 0 then
- if d == "l" then
- if trace_directions then
- list[#list+1] = format("char %s (%s / U+%04X) of class %s overidden to r (bidi=%s)",utfchar(char),char,char,d,attr)
- end
- d = "r"
- elseif trace_directions then
- if d == "lro" or d == "rlo" or d == "pdf" then -- else side effects on terminal
- list[#list+1] = format("override char of class %s (bidi=%s)",d,attr)
- else -- todo: rle lre
- list[#list+1] = format("char %s (%s / U+%04X) of class %s (bidi=%s)",utfchar(char),char,char,d,attr)
- end
- end
- elseif lro or override < 0 then
- if d == "r" or d == "al" then
- current[a_state] = s_isol -- maybe better have a special bidi attr value -> override (9) -> todo
- if trace_directions then
- list[#list+1] = format("char %s (%s / U+%04X) of class %s overidden to l (bidi=%s) (state=isol)",utfchar(char),char,char,d,attr)
- end
- d = "l"
- elseif trace_directions then
- if d == "lro" or d == "rlo" or d == "pdf" then -- else side effects on terminal
- list[#list+1] = format("override char of class %s (bidi=%s)",d,attr)
- else -- todo: rle lre
- list[#list+1] = format("char %s (%s / U+%04X) of class %s (bidi=%s)",utfchar(char),char,char,d,attr)
- end
- end
- elseif trace_directions then
- if d == "lro" or d == "rlo" or d == "pdf" then -- else side effects on terminal
- list[#list+1] = format("override char of class %s (bidi=%s)",d,attr)
- else -- todo: rle lre
- list[#list+1] = format("char %s (%s / U+%04X) of class %s (bidi=%s)",utfchar(char),char,char,d,attr)
- end
- end
- if d == "on" then
- local mirror = chardata[char].mirror -- maybe make a special mirror table
- if mirror and fontchar[current.font][mirror] then
- -- todo: set attribute
- if autodir < 0 then
- current.char = mirror
- done = true
- --~ elseif left or autodir > 0 then
- --~ if not is_right(current.prev) then
- --~ current.char = mirror
- --~ done = true
- --~ end
- end
- end
- elseif d == "l" or d == "en" then -- european number
- if autodir <= 0 then -- could be option
- force_auto_left_before()
- end
- elseif d == "r" or d == "al" then -- arabic number
- if autodir >= 0 then
- force_auto_right_before()
- end
- elseif d == "an" then -- arabic number
- -- actually this is language dependent ...
--- if autodir <= 0 then
--- force_auto_left_before()
--- end
- if autodir >= 0 then
- force_auto_right_before()
- end
- elseif d == "lro" then -- Left-to-Right Override -> right becomes left
- if trace_directions then
- list[#list+1] = "override right -> left"
- end
- top = top + 1
- stack[top] = { override, embedded }
- override = -1
- obsolete[#obsolete+1] = current
- elseif d == "rlo" then -- Right-to-Left Override -> left becomes right
- if trace_directions then
- list[#list+1] = "override left -> right"
- end
- top = top + 1
- stack[top] = { override, embedded }
- override = 1
- obsolete[#obsolete+1] = current
- elseif d == "lre" then -- Left-to-Right Embedding -> TLT
- if trace_directions then
- list[#list+1] = "embedding left -> right"
- end
- top = top + 1
- stack[top] = { override, embedded }
- embedded = 1
- obsolete[#obsolete+1] = current
- elseif d == "rle" then -- Right-to-Left Embedding -> TRT
- if trace_directions then
- list[#list+1] = "embedding right -> left"
- end
- top = top + 1
- stack[top] = { override, embedded }
- embedded = -1 -- was 1
- obsolete[#obsolete+1] = current
- elseif d == "pdf" then -- Pop Directional Format
- -- override = 0
- if top > 0 then
- local s = stack[top]
- override, embedded = s[1], s[2]
- top = top - 1
- if trace_directions then
- list[#list+1] = format("state: override: %s, embedded: %s, autodir: %s",override,embedded,autodir)
- end
- else
- if trace_directions then
- list[#list+1] = "pop (error, too many pops)"
- end
- end
- obsolete[#obsolete+1] = current
- end
- elseif trace_directions then
- local char = current.char
- local d = chardirs[char]
- list[#list+1] = format("char %s (%s / U+%04X) of class %s (no bidi)",utfchar(char),char,char,d or "?")
- end
- elseif id == whatsit_code then
- if finish then
- finish_auto_before()
- end
- local subtype = current.subtype
- if subtype == localpar_code then
- local dir = current.dir
- local d = sub(dir,2,2)
- if d == 'R' then -- find(dir,".R.") / dir == "TRT"
- autodir = -1
- else
- autodir = 1
- end
- -- embedded = autodir
- if trace_directions then
- list[#list+1] = format("pardir %s",dir)
- end
- elseif subtype == dir_code then
- local dir = current.dir
- -- local sign = sub(dir,1,1)
- -- local dire = sub(dir,3,3)
- local sign, dire = match(dir,"^(.).(.)")
- if dire == "R" then
- if sign == "+" then
- finish, autodir = "TRT", -1
- else
- finish, autodir = nil, 0
- end
- else
- if sign == "+" then
- finish, autodir = "TLT", 1
- else
- finish, autodir = nil, 0
- end
- end
- if trace_directions then
- list[#list+1] = format("textdir %s",dir)
- end
- end
- else
- if trace_directions then
- list[#list+1] = format("node %s (subtype %s)",nodecodes[id],current.subtype)
- end
- if finish then
- finish_auto_before()
- end
- end
- local cn = current.next
- if not cn then
- if finish then
- finish_auto_after()
- end
- end
- current = cn
- end
- end
- if trace_directions and glyphs then
- report_directions("start log")
- for i=1,#list do
- report_directions("%02i: %s",i,list[i])
- end
- report_directions("stop log")
- end
- if done and strip then
- local n = #obsolete
- if n > 0 then
- for i=1,n do
- remove_node(head,obsolete[i],true)
- end
- report_directions("%s character nodes removed",n)
- end
- end
- return head, done
-end
-
---~ local function is_right(n) -- keep !
---~ if n then
---~ local id = n.id
---~ if id == glyph_code then
---~ local attr = n[attribute]
---~ if attr and attr > 0 then
---~ local d = chardirs[n.char]
---~ if d == "r" or d == "al" then -- override
---~ return true
---~ end
---~ end
---~ end
---~ end
---~ return false
---~ end
-
---~ function directions.enable()
---~ tasks.enableaction("processors","directions.handler")
---~ end
-
-local enabled = false
-
-function directions.set(n) -- todo: names and numbers
- if not enabled then
- if trace_directions then
- report_breakpoints("enabling directions handler")
- end
- tasks.enableaction("processors","typesetters.directions.handler")
- enabled = true
- end
- if not n or n == 0 then
- n = unsetvalue
- -- maybe tracing
- end
- texattribute[a_directions] = n
-end
-
-commands.setdirection = directions.set
-
-directions.handler = nodes.installattributehandler {
- name = "directions",
- namespace = directions,
- processor = directions.process,
-}
+if not modules then modules = { } end modules ['typo-dir'] = {
+ version = 1.001,
+ comment = "companion to typo-dir.mkiv",
+ author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+ copyright = "PRAGMA ADE / ConTeXt Development Team",
+ license = "see context related readme files"
+}
+
+-- todo: also use end_of_math here?
+
+local next, type = next, type
+local format, insert, sub, find, match = string.format, table.insert, string.sub, string.find, string.match
+local utfchar = utf.char
+
+-- vertical space handler
+
+local nodes, node = nodes, node
+
+local trace_directions = false trackers.register("typesetters.directions", function(v) trace_directions = v end)
+
+local report_directions = logs.reporter("typesetting","directions")
+
+local traverse_id = node.traverse_id
+local insert_node_before = node.insert_before
+local insert_node_after = node.insert_after
+local remove_node = nodes.remove
+
+local texattribute = tex.attribute
+local unsetvalue = attributes.unsetvalue
+
+local nodecodes = nodes.nodecodes
+local whatcodes = nodes.whatcodes
+local mathcodes = nodes.mathcodes
+
+local tasks = nodes.tasks
+
+local glyph_code = nodecodes.glyph
+local whatsit_code = nodecodes.whatsit
+local math_code = nodecodes.math
+
+local localpar_code = whatcodes.localpar
+local dir_code = whatcodes.dir
+
+local nodepool = nodes.pool
+
+local new_textdir = nodepool.textdir
+
+local beginmath_code = mathcodes.beginmath
+local endmath_code = mathcodes.endmath
+
+local fonthashes = fonts.hashes
+local fontdata = fonthashes.identifiers
+local fontchar = fonthashes.characters
+
+local chardata = characters.data
+local chardirs = characters.directions -- maybe make a special mirror table
+
+--~ Analysis by Idris:
+--~
+--~ 1. Assuming the reading- vs word-order distinction (bidi-char types) is governing;
+--~ 2. Assuming that 'ARAB' represents an actual arabic string in raw input order, not word-order;
+--~ 3. Assuming that 'BARA' represent the correct RL word order;
+--~
+--~ Then we have, with input: LATIN ARAB
+--~
+--~ \textdir TLT LATIN ARAB => LATIN BARA
+--~ \textdir TRT LATIN ARAB => LATIN BARA
+--~ \textdir TRT LRO LATIN ARAB => LATIN ARAB
+--~ \textdir TLT LRO LATIN ARAB => LATIN ARAB
+--~ \textdir TLT RLO LATIN ARAB => NITAL ARAB
+--~ \textdir TRT RLO LATIN ARAB => NITAL ARAB
+
+-- elseif d == "es" then -- European Number Separator
+-- elseif d == "et" then -- European Number Terminator
+-- elseif d == "cs" then -- Common Number Separator
+-- elseif d == "nsm" then -- Non-Spacing Mark
+-- elseif d == "bn" then -- Boundary Neutral
+-- elseif d == "b" then -- Paragraph Separator
+-- elseif d == "s" then -- Segment Separator
+-- elseif d == "ws" then -- Whitespace
+-- elseif d == "on" then -- Other Neutrals
+
+typesetters.directions = typesetters.directions or { }
+local directions = typesetters.directions
+
+local a_state = attributes.private('state')
+local a_directions = attributes.private('directions')
+
+local skipmath = true
+local strip = false
+
+-- todo: delayed inserts here
+-- todo: get rid of local functions here
+
+-- beware, math adds whatsits afterwards so that will mess things up
+
+local finish, autodir, embedded, override, done = nil, 0, 0, 0, false
+local list, glyphs = nil, false
+local finished, finidir, finipos = nil, nil, 1
+local head, current, inserted = nil, nil, nil
+
+local function finish_auto_before()
+ head, inserted = insert_node_before(head,current,new_textdir("-"..finish))
+ finished, finidir = inserted, finish
+ if trace_directions then
+ insert(list,#list,format("auto finish inserted before: %s",finish))
+ finipos = #list-1
+ end
+ finish, autodir, done = nil, 0, true
+end
+
+local function finish_auto_after()
+ head, current = insert_node_after(head,current,new_textdir("-"..finish))
+ finished, finidir = current, finish
+ if trace_directions then
+ list[#list+1] = format("auto finish inserted after: %s",finish)
+ finipos = #list
+ end
+ finish, autodir, done = nil, 0, true
+end
+
+local function force_auto_left_before()
+ if finish then
+ finish_auto_before()
+ end
+ if embedded >= 0 then
+ finish, autodir, done = "TLT", 1, true
+ else
+ finish, autodir, done = "TRT", -1, true
+ end
+ if finidir == finish then
+ head = remove_node(head,finished,true)
+ if trace_directions then
+ list[finipos] = list[finipos] .. " (deleted afterwards)"
+ insert(list,#list,format("start text dir %s (embedded: %s)",finish,embedded))
+ end
+ else
+ head, inserted = insert_node_before(head,current,new_textdir("+"..finish))
+ if trace_directions then
+ insert(list,#list,format("start text dir %s (embedded: %s)",finish,embedded))
+ end
+ end
+end
+
+local function force_auto_right_before()
+ if finish then
+ finish_auto_before()
+ end
+ if embedded <= 0 then
+ finish, autodir, done = "TRT", -1, true
+ else
+ finish, autodir, done = "TLT", 1, true
+ end
+ if finidir == finish then
+ head = remove_node(head,finished,true)
+ if trace_directions then
+ list[finipos] = list[finipos] .. " (deleted afterwards)"
+ insert(list,#list,format("start text dir %s (embedded: %s)",finish,embedded))
+ end
+ else
+ head, inserted = insert_node_before(head,current,new_textdir("+"..finish))
+ if trace_directions then
+ insert(list,#list,format("start text dir %s (embedded: %s)",finish,embedded))
+ end
+ end
+end
+
+-- todo: use new dir functions
+
+local s_isol = fonts.analyzers.states.isol
+
+function directions.process(namespace,attribute,start) -- todo: make faster
+ if not start.next then
+ return start, false
+ end
+ head, current, inserted = start, start, nil
+ finish, autodir, embedded, override, done = nil, 0, 0, 0, false
+ list, glyphs = trace_directions and { }, false
+ finished, finidir, finipos = nil, nil, 1
+ local stack, top, obsolete = { }, 0, { }
+ local lro, rlo, prevattr, inmath = false, false, 0, false
+ while current do
+ local id = current.id
+ if skipmath and id == math_code then
+ local subtype = current.subtype
+ if subtype == beginmath_code then
+ inmath = true
+ elseif subtype == endmath_code then
+ inmath = false
+ else
+ -- todo
+ end
+ current = current.next
+ elseif inmath then
+ current = current.next
+ else
+ local attr = current[attribute]
+ if attr and attr > 0 then
+ -- current[attribute] = unsetvalue -- slow, needed?
+ if attr == 1 then
+ -- bidi parsing mode
+ elseif attr ~= prevattr then
+ -- no pop, grouped driven (2=normal,3=lro,4=rlo)
+ if attr == 3 then
+ if trace_directions then
+ list[#list+1] = format("override right -> left (lro) (bidi=%s)",attr)
+ end
+ lro, rlo = true, false
+ elseif attr == 4 then
+ if trace_directions then
+ list[#list+1] = format("override left -> right (rlo) (bidi=%s)",attr)
+ end
+ lro, rlo = false, true
+ else
+ if trace_directions and
+ current ~= head then list[#list+1] = format("override reset (bidi=%s)",attr)
+ end
+ lro, rlo = false, false
+ end
+ prevattr = attr
+ end
+ end
+ if id == glyph_code then
+ glyphs = true
+ if attr and attr > 0 then
+ local char = current.char
+ local d = chardirs[char]
+ if rlo or override > 0 then
+ if d == "l" then
+ if trace_directions then
+ list[#list+1] = format("char %s (%s / U+%04X) of class %s overidden to r (bidi=%s)",utfchar(char),char,char,d,attr)
+ end
+ d = "r"
+ elseif trace_directions then
+ if d == "lro" or d == "rlo" or d == "pdf" then -- else side effects on terminal
+ list[#list+1] = format("override char of class %s (bidi=%s)",d,attr)
+ else -- todo: rle lre
+ list[#list+1] = format("char %s (%s / U+%04X) of class %s (bidi=%s)",utfchar(char),char,char,d,attr)
+ end
+ end
+ elseif lro or override < 0 then
+ if d == "r" or d == "al" then
+ current[a_state] = s_isol -- maybe better have a special bidi attr value -> override (9) -> todo
+ if trace_directions then
+ list[#list+1] = format("char %s (%s / U+%04X) of class %s overidden to l (bidi=%s) (state=isol)",utfchar(char),char,char,d,attr)
+ end
+ d = "l"
+ elseif trace_directions then
+ if d == "lro" or d == "rlo" or d == "pdf" then -- else side effects on terminal
+ list[#list+1] = format("override char of class %s (bidi=%s)",d,attr)
+ else -- todo: rle lre
+ list[#list+1] = format("char %s (%s / U+%04X) of class %s (bidi=%s)",utfchar(char),char,char,d,attr)
+ end
+ end
+ elseif trace_directions then
+ if d == "lro" or d == "rlo" or d == "pdf" then -- else side effects on terminal
+ list[#list+1] = format("override char of class %s (bidi=%s)",d,attr)
+ else -- todo: rle lre
+ list[#list+1] = format("char %s (%s / U+%04X) of class %s (bidi=%s)",utfchar(char),char,char,d,attr)
+ end
+ end
+ if d == "on" then
+ local mirror = chardata[char].mirror -- maybe make a special mirror table
+ if mirror and fontchar[current.font][mirror] then
+ -- todo: set attribute
+ if autodir < 0 then
+ current.char = mirror
+ done = true
+ --~ elseif left or autodir > 0 then
+ --~ if not is_right(current.prev) then
+ --~ current.char = mirror
+ --~ done = true
+ --~ end
+ end
+ end
+ elseif d == "l" or d == "en" then -- european number
+ if autodir <= 0 then -- could be option
+ force_auto_left_before()
+ end
+ elseif d == "r" or d == "al" then -- arabic number
+ if autodir >= 0 then
+ force_auto_right_before()
+ end
+ elseif d == "an" then -- arabic number
+ -- actually this is language dependent ...
+-- if autodir <= 0 then
+-- force_auto_left_before()
+-- end
+ if autodir >= 0 then
+ force_auto_right_before()
+ end
+ elseif d == "lro" then -- Left-to-Right Override -> right becomes left
+ if trace_directions then
+ list[#list+1] = "override right -> left"
+ end
+ top = top + 1
+ stack[top] = { override, embedded }
+ override = -1
+ obsolete[#obsolete+1] = current
+ elseif d == "rlo" then -- Right-to-Left Override -> left becomes right
+ if trace_directions then
+ list[#list+1] = "override left -> right"
+ end
+ top = top + 1
+ stack[top] = { override, embedded }
+ override = 1
+ obsolete[#obsolete+1] = current
+ elseif d == "lre" then -- Left-to-Right Embedding -> TLT
+ if trace_directions then
+ list[#list+1] = "embedding left -> right"
+ end
+ top = top + 1
+ stack[top] = { override, embedded }
+ embedded = 1
+ obsolete[#obsolete+1] = current
+ elseif d == "rle" then -- Right-to-Left Embedding -> TRT
+ if trace_directions then
+ list[#list+1] = "embedding right -> left"
+ end
+ top = top + 1
+ stack[top] = { override, embedded }
+ embedded = -1 -- was 1
+ obsolete[#obsolete+1] = current
+ elseif d == "pdf" then -- Pop Directional Format
+ -- override = 0
+ if top > 0 then
+ local s = stack[top]
+ override, embedded = s[1], s[2]
+ top = top - 1
+ if trace_directions then
+ list[#list+1] = format("state: override: %s, embedded: %s, autodir: %s",override,embedded,autodir)
+ end
+ else
+ if trace_directions then
+ list[#list+1] = "pop (error, too many pops)"
+ end
+ end
+ obsolete[#obsolete+1] = current
+ end
+ elseif trace_directions then
+ local char = current.char
+ local d = chardirs[char]
+ list[#list+1] = format("char %s (%s / U+%04X) of class %s (no bidi)",utfchar(char),char,char,d or "?")
+ end
+ elseif id == whatsit_code then
+ if finish then
+ finish_auto_before()
+ end
+ local subtype = current.subtype
+ if subtype == localpar_code then
+ local dir = current.dir
+ local d = sub(dir,2,2)
+ if d == 'R' then -- find(dir,".R.") / dir == "TRT"
+ autodir = -1
+ else
+ autodir = 1
+ end
+ -- embedded = autodir
+ if trace_directions then
+ list[#list+1] = format("pardir %s",dir)
+ end
+ elseif subtype == dir_code then
+ local dir = current.dir
+ -- local sign = sub(dir,1,1)
+ -- local dire = sub(dir,3,3)
+ local sign, dire = match(dir,"^(.).(.)")
+ if dire == "R" then
+ if sign == "+" then
+ finish, autodir = "TRT", -1
+ else
+ finish, autodir = nil, 0
+ end
+ else
+ if sign == "+" then
+ finish, autodir = "TLT", 1
+ else
+ finish, autodir = nil, 0
+ end
+ end
+ if trace_directions then
+ list[#list+1] = format("textdir %s",dir)
+ end
+ end
+ else
+ if trace_directions then
+ list[#list+1] = format("node %s (subtype %s)",nodecodes[id],current.subtype)
+ end
+ if finish then
+ finish_auto_before()
+ end
+ end
+ local cn = current.next
+ if not cn then
+ if finish then
+ finish_auto_after()
+ end
+ end
+ current = cn
+ end
+ end
+ if trace_directions and glyphs then
+ report_directions("start log")
+ for i=1,#list do
+ report_directions("%02i: %s",i,list[i])
+ end
+ report_directions("stop log")
+ end
+ if done and strip then
+ local n = #obsolete
+ if n > 0 then
+ for i=1,n do
+ remove_node(head,obsolete[i],true)
+ end
+ report_directions("%s character nodes removed",n)
+ end
+ end
+ return head, done
+end
+
+--~ local function is_right(n) -- keep !
+--~ if n then
+--~ local id = n.id
+--~ if id == glyph_code then
+--~ local attr = n[attribute]
+--~ if attr and attr > 0 then
+--~ local d = chardirs[n.char]
+--~ if d == "r" or d == "al" then -- override
+--~ return true
+--~ end
+--~ end
+--~ end
+--~ end
+--~ return false
+--~ end
+
+--~ function directions.enable()
+--~ tasks.enableaction("processors","directions.handler")
+--~ end
+
+local enabled = false
+
+function directions.set(n) -- todo: names and numbers
+ if not enabled then
+ if trace_directions then
+ report_breakpoints("enabling directions handler")
+ end
+ tasks.enableaction("processors","typesetters.directions.handler")
+ enabled = true
+ end
+ if not n or n == 0 then
+ n = unsetvalue
+ -- maybe tracing
+ end
+ texattribute[a_directions] = n
+end
+
+commands.setdirection = directions.set
+
+directions.handler = nodes.installattributehandler {
+ name = "directions",
+ namespace = directions,
+ processor = directions.process,
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-11 08:25:06 +0000