diff options
Diffstat (limited to 'tex/context/base/mkxl/math-spa.lmt')
| -rw-r--r-- | tex/context/base/mkxl/math-spa.lmt | 172 |
1 files changed, 116 insertions, 56 deletions
diff --git a/tex/context/base/mkxl/math-spa.lmt b/tex/context/base/mkxl/math-spa.lmt index 32de6e417..487d9e4a4 100644 --- a/tex/context/base/mkxl/math-spa.lmt +++ b/tex/context/base/mkxl/math-spa.lmt @@ -8,79 +8,139 @@ if not modules then modules = { } end modules ['math-spa'] = { -- for the moment (when testing) we use a penalty 1 -local boundary_code = nodes.nodecodes.boundary -local glue_code = nodes.nodecodes.glue +local setmetatableindex = table.setmetatableindex -local nuts = nodes.nuts -local tonut = nodes.tonut -local tonode = nodes.tonode +local boundary_code = nodes.nodecodes.boundary +local hlist_code = nodes.nodecodes.hlist +local glue_code = nodes.nodecodes.glue +local line_code = nodes.listcodes.line +local ghost_code = nodes.listcodes.ghost -local getid = nuts.getid -local getnext = nuts.getnext -local getwidth = nuts.getwidth -local getdata = nuts.getdata -local setglue = nuts.setglue -local getdimensions = nuts.dimensions -local nextglue = nuts.traversers.glue +local nuts = nodes.nuts +local tonut = nodes.tonut +local tonode = nodes.tonode -local texsetdimen = tex.setdimen +local getid = nuts.getid +local getsubtype = nuts.getsubtype +local getnext = nuts.getnext +local getwidth = nuts.getwidth +local getdata = nuts.getdata +local getdepth = nuts.getdepth +local getlist = nuts.getlist +local setglue = nuts.setglue +local getdimensions = nuts.dimensions +local getnormalizedline = node.direct.getnormalizedline +local getbox = nuts.getbox +local setoffsets = nuts.setoffsets -local v_none = interfaces.variables.none -local v_auto = interfaces.variables.auto +local nextglue = nuts.traversers.glue +local nextlist = nuts.traversers.list +local nextboundary = nuts.traversers.boundary -local method = v_none -local distance = 0 -local boundary = tex.boundaries.system("mathalign") +local texgetdimen = tex.getdimen +local texsetdimen = tex.setdimen +local texsetcount = tex.setcount -function noads.handlers.align(h) - if method ~= v_none then - if method == v_auto then - --- can be a fast loop - local s = h - while s do - local id = getid(s) - local n = getnext(s) - if id == boundary_code and getdata(s) == boundary then - if n and getid(n) == glue_code then - s = n - n = getnext(s) - end - local w = getdimensions(h,n) + distance - texsetdimen("global","d_strc_math_indent",w) - break - end - s = n +local boundary = tex.boundaries.system("mathalign") +local stages = { } +local initial = { } + +stages[1] = function(specification,stage) + local box = getbox(specification.box) + local head = getlist(box) + local align = specification.alignstate + local distance = specification.distance + for s in nextboundary, head do + if getdata(s) == boundary then + -- todo: skip over ghost, maybe penalty, maybe glues all in one loop + local n = getnext(s) + while n and getid(n) == hlist_code and getsubtype(n) == ghost_code do + n = getnext(n) end - else - texsetdimen("global","d_strc_math_indent",distance) + -- while n and getid(n) == glue_code do + if n and getid(n) == glue_code then + n = getnext(n) + end + distance = distance + getdimensions(head,n) + break end - for n in nextglue, h do - setglue(n,getwidth(n),0,0) + end + texsetdimen("global","d_strc_math_indent",distance) + if align == 2 then + for n in nextglue, head do + setglue(n,getwidth(n),0,0,0,0) end - else - -- texsetdimen("global","d_strc_math_indent",0) end end +stages[2] = function(specification,stage) + local head = getlist(getbox(specification.box)) + local align = specification.alignstate + local max = false + local cnt = 0 + local width = 0 + local depth = 0 + for n, id, subtype, list in nextlist, head do + if subtype == line_code then + local t = getnormalizedline(n) + local m = t.rightskip + t.parfillrightskip + if not max then + max = m + elseif m < max then + max = m + end + cnt = cnt + 1 + width = m + depth = getdepth(n) + end + end + if stage == 2 and (align == 2 or align == 3) then + for n, id, subtype, list in nextlist, head do + if subtype == line_code then + if align == 1 then -- flushleft + elseif align == 2 then -- middle + setoffsets(n,max/2,0) + elseif align == 3 then -- flushright + setoffsets(n,max,0) + end + end + end + end + texsetcount("global","c_strc_math_n_of_lines",cnt) + texsetdimen("global","d_strc_math_max_width",max) + texsetdimen("global","d_strc_math_last_width",width) + texsetdimen("global","d_strc_math_last_depth",depth) +end + +stages[3] = stages[2] + +stages[4] = function(specification,stage) + nuts.openup(specification,getlist(getbox(specification.box))) +end + interfaces.implement { - name = "setmathhang", + name = "handlemathhang", arguments = { { - { "method", "string" }, + { "stage", "integer" }, + -- { "method" }, + { "alignstate", "integer" }, + { "box", "integer" }, { "distance", "dimension" }, + { "inbetween", "dimension" }, + { "height", "dimension" }, + { "depth", "dimension" }, } }, - actions = function(t) - method = t.method or v_none - distance = t.distance or 0 - end -} - -interfaces.implement { - name = "resetmathhang", - actions = function(t) - method = v_none - distance = 0 + actions = function(specification) + local stage = specification.stage + if stage == 1 then + initial = specification + else + setmetatableindex(specification,initial) + end + if stage > 0 and stage <= #stages then + stages[stage](specification,stage) + end end } - |