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Diffstat (limited to 'tex/context/base/math-dir.lua')
| -rw-r--r-- | tex/context/base/math-dir.lua | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/tex/context/base/math-dir.lua b/tex/context/base/math-dir.lua deleted file mode 100644 index 507a24e41..000000000 --- a/tex/context/base/math-dir.lua +++ /dev/null @@ -1,145 +0,0 @@ -if not modules then modules = { } end modules ['math-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" -} - --- As I'm wrapping up the updated math support (for CTX/TUG 2013) I wondered about numbers in --- r2l math mode. Googling lead me to TUGboat, Volume 25 (2004), No. 2 where I see numbers --- running from left to right. Makes me wonder how far we should go. And as I was looking --- into bidi anyway, it's a nice distraction. --- --- I first tried to hook something into noads but that gets pretty messy due to indirectness --- char noads. If needed, I'll do it that way. With regards to spacing: as we can assume that --- only numbers are involved we can safely swap them and the same is true for mirroring. But --- anyway, I'm not too happy with this solution so eventually I'll do something with noads (as --- an alternative method). Yet another heuristic approach. - -local nodes, node = nodes, node - -local trace_directions = false trackers.register("typesetters.directions.math", function(v) trace_directions = v end) - -local report_directions = logs.reporter("typesetting","math directions") - -local insert_node_before = nodes.insert_before -local insert_node_after = nodes.insert_after - -local nodecodes = nodes.nodecodes -local tasks = nodes.tasks - -local glyph_code = nodecodes.glyph -local hlist_code = nodecodes.hlist -local vlist_code = nodecodes.vlist - -local nodepool = nodes.pool - -local new_textdir = nodepool.textdir - -local chardirections = characters.directions -local charmirrors = characters.mirrors -local charclasses = characters.textclasses - -local directions = typesetters.directions or { } - -local a_mathbidi = attributes.private('mathbidi') - -local function processmath(head) - local current = head - local done = false - local start = nil - local stop = nil - local function capsulate() - head = insert_node_before(head,start,new_textdir("+TLT")) - insert_node_after(head,stop,new_textdir("-TLT")) - if trace_directions then - report_directions("reversed: %s",nodes.listtoutf(start,false,false,stop)) - end - done = true - start = false - stop = nil - end - while current do - local id = current.id - if id == glyph_code then - local char = current.char - local cdir = chardirections[char] - if cdir == "en" or cdir == "an" then -- we could check for mathclass punctuation - if not start then - start = current - end - stop = current - else - if not start then - -- nothing - elseif start == stop then - start = nil - else - capsulate() - end - if cdir == "on" then - local mirror = charmirrors[char] - if mirror then - local class = charclasses[char] - if class == "open" or class == "close" then - current.char = mirror - if trace_directions then - report_directions("mirrored: %C to %C",char,mirror) - end - done = true - end - end - end - end - elseif not start then - -- nothing - elseif start == stop then - start = nil - else - capsulate(head,start,stop) - -- math can pack things into hlists .. we need to make sure we don't process - -- too often: needs checking - if id == hlist_code or id == vlist_code then - local list, d = processmath(current.list) - current.list = list - if d then - done = true - end - end - end - current = current.next - end - if not start then - -- nothing - elseif start == stop then - -- nothing - else - capsulate() - end - return head, done -end - -local enabled = false - -function directions.processmath(head) -- style, penalties - if enabled then - local a = head[a_mathbidi] - if a and a > 0 then - return processmath(head) - end - end - return head, false -end - -function directions.setmath(n) - if not enabled and n and n > 0 then - if trace_directions then - report_directions("enabling directions handler") - end - tasks.enableaction("math","typesetters.directions.processmath") - enabled = true - end -end - -commands.setmathdirection = directions.setmath |