diff options
Diffstat (limited to 'tex/context/base/math-noa.lua')
| -rw-r--r-- | tex/context/base/math-noa.lua | 98 |
1 files changed, 85 insertions, 13 deletions
diff --git a/tex/context/base/math-noa.lua b/tex/context/base/math-noa.lua index d8c6b2b20..2b4f9b6fa 100644 --- a/tex/context/base/math-noa.lua +++ b/tex/context/base/math-noa.lua @@ -9,6 +9,8 @@ if not modules then modules = { } end modules ['math-noa'] = { -- beware: this is experimental code and there will be a more -- generic (attribute value driven) interface too but for the -- moment this is ok +-- +-- we will also make dedicated processors (faster) local utf = unicode.utf8 @@ -29,19 +31,19 @@ local trace_analyzing = false trackers.register("math.analyzing", function(v) local report_noads = logs.new("mathematics") -local noad_ord = 0 -local noad_op_displaylimits = 1 -local noad_op_limits = 2 -local noad_op_nolimits = 3 -local noad_bin = 4 -local noad_rel = 5 -local noad_open = 6 -local noad_close = 7 -local noad_punct = 8 -local noad_inner = 9 -local noad_under = 10 -local noad_over = 11 -local noad_vcenter = 12 +local noad_ord = 0 +local noad_op_displaylimits = 1 +local noad_op_limits = 2 +local noad_op_nolimits = 3 +local noad_bin = 4 +local noad_rel = 5 +local noad_open = 6 +local noad_close = 7 +local noad_punct = 8 +local noad_inner = 9 +local noad_under = 10 +local noad_over = 11 +local noad_vcenter = 12 -- obsolete: -- @@ -337,6 +339,76 @@ function noads.respace_characters(head,style,penalties) return true end +-- math alternates + +function fonts.initializers.common.mathalternates(tfmdata) + local goodies = tfmdata.goodies + if goodies then + for i=1,#goodies do + -- first one counts + -- we can consider sharing the attributes ... todo (only once scan) + local mathgoodies = goodies[i].mathematics + local alternates = mathgoodies and mathgoodies.alternates + if alternates then + local lastattribute, attributes = 0, { } + for k, v in next, alternates do + lastattribute = lastattribute + 1 + v.attribute = lastattribute + attributes[lastattribute] = v + end + tfmdata.shared.mathalternates = alternates -- to be checked if shared is ok here + tfmdata.shared.mathalternatesattributes = attributes -- to be checked if shared is ok here + return + end + end + end +end + +fonts.otf.tables.features['mathalternates'] = 'Additional math alternative shapes' + +fonts.otf.features.register('mathalternates',true) +table.insert(fonts.triggers,"mathalternates") + +fonts.initializers.base.otf.mathalternates = fonts.initializers.common.mathalternates +fonts.initializers.node.otf.mathalternates = fonts.initializers.common.mathalternates + +local get_alternate = fonts.otf.get_alternate + +local mathalternate = attributes.private("mathalternate") + +local alternate = { } -- noads.processors.alternate = alternate + +function mathematics.setalternate(fam,tag) + local id = font_of_family(fam) + local tfmdata = fontdata[id] + local mathalternates = tfmdata.shared.mathalternates + if mathalternates then + local m = mathalternates[tag] + tex.attribute[mathalternate] = m and m.attribute or attributes.unsetvalue + end +end + +alternate[math_char] = function(pointer) + local a = has_attribute(pointer,mathalternate) + if a and a > 0 then + set_attribute(pointer,mathalternate,0) + local tfmdata = fontdata[font_of_family(pointer.fam)] -- we can also have a famdata + local mathalternatesattributes = tfmdata.shared.mathalternatesattributes + if mathalternatesattributes then + local what = mathalternatesattributes[a] + local alt = get_alternate(tfmdata,pointer.char,what.feature,what.value) + if alt then + pointer.char = alt + end + end + end +end + +function noads.check_alternates(head,style,penalties) + process(head,alternate) + return true +end + -- the normal builder function noads.mlist_to_hlist(head,style,penalties) |