diff options
Diffstat (limited to 'tex/context/base/mkiv/back-ini.lua')
| -rw-r--r-- | tex/context/base/mkiv/back-ini.lua | 161 |
1 files changed, 147 insertions, 14 deletions
diff --git a/tex/context/base/mkiv/back-ini.lua b/tex/context/base/mkiv/back-ini.lua index e21f0ce6d..94cdcd29f 100644 --- a/tex/context/base/mkiv/back-ini.lua +++ b/tex/context/base/mkiv/back-ini.lua @@ -6,36 +6,46 @@ if not modules then modules = { } end modules ['back-ini'] = { license = "see context related readme files" } --- -- how to create a shortcut: --- --- local function something(...) --- something = backends.codeinjections.something --- return something(...) --- end - local next, type = next, type local format = string.format +local sind, cosd, abs = math.sind, math.cosd, math.abs +local insert, remove = table.insert, table.remove +local unpack = unpack backends = backends or { } local backends = backends local trace_backend = false trackers.register("backend.initializers", function(v) trace_finalizers = v end) + +local report = logs.reporter("backend") local report_backend = logs.reporter("backend","initializing") local allocate = utilities.storage.allocate local setmetatableindex = table.setmetatableindex local setaction = nodes.tasks.setaction +local scanners = tokens.scanners +local scannumber = scanners.number +local scankeyword = scanners.keyword +local scancount = scanners.count +local scanstring = scanners.string + +local scanners = interfaces.scanners + +local implement = interfaces.implement + local texset = tex.set -local function nothing() return nil end +local nodeinjections = { } +local codeinjections = { } +local registrations = { } +local tables = allocate() -backends.nothing = nothing +local function nothing() + return nil +end -local nodeinjections = { } -local codeinjections = { } -local registrations = { } -local tables = allocate() +backends.nothing = nothing local function donothing(t,k) t[k] = nothing @@ -175,9 +185,132 @@ function codeinjections.getpagedimensions() return paper_width, paper_height end -interfaces.implement { +implement { name = "shipoutoffset", actions = function() context(lmtxmode() and "0pt" or "-1in") -- the old tex offset end } + +-- could also be codeinjections + +function backends.noflatelua() + return status.late_callbacks or 0 +end + +-- + +local stack = { } +local restore = true -- false + +local nodepool = nodes.pool +local savenode = nodepool.save +local restorenode = nodepool.restore +local setmatrixnode = nodepool.setmatrix + +-- updaters.register("backend.update",function() +-- savenode = nodepool.save +-- restorenode = nodepool.restore +-- setmatrixnode = nodepool.setmatrix +-- end) + +local function stopsomething() + local top = remove(stack) + if top == false then + -- not wrapped + elseif top == true then + context(restorenode()) + elseif top then + context(setmatrixnode(unpack(top))) -- not really needed anymore + context(restorenode()) + else + -- nesting error + end +end + +local function startrotation() + local a = scannumber() + if a == 0 then + insert(stack,false) + else + local s, c = sind(a), cosd(a) + if abs(s) < 0.000001 then + s = 0 -- otherwise funny -0.00000 + end + if abs(c) < 0.000001 then + c = 0 -- otherwise funny -0.00000 + end + context(savenode()) + context(setmatrixnode(c,s,-s,c)) + insert(stack,restore and { c, -s, s, c } or true) + end +end + +implement { name = "startrotation", actions = startrotation } +implement { name = "stoprotation", actions = stopsomething } + +local function startscaling() -- at the tex end we use sx and sy instead of rx and ry + local rx, ry = 1, 1 + while true do + if scankeyword("rx") then + rx = scannumber() + elseif scankeyword("ry") then + ry = scannumber() + -- elseif scankeyword("revert") then + -- local top = stack[#stack] + -- if top then + -- rx = top[1] + -- ry = top[4] + -- else + -- rx = 1 + -- ry = 1 + -- end + else + break + end + end + if rx == 1 and ry == 1 then + insert(stack,false) + else + if rx == 0 then + rx = 0.0001 + end + if ry == 0 then + ry = 0.0001 + end + context(savenode()) + context(setmatrixnode(rx,0,0,ry)) + insert(stack,restore and { 1/rx, 0, 0, 1/ry } or true) + end +end + +implement { name = "startscaling", actions = startscaling } +implement { name = "stopscaling", actions = stopsomething } + +local function startmatrix() -- rx sx sy ry -- tx, ty + local rx, sx, sy, ry = 1, 0, 0, 1 + while true do + if scankeyword("rx") then rx = scannumber() + elseif scankeyword("ry") then ry = scannumber() + elseif scankeyword("sx") then sx = scannumber() + elseif scankeyword("sy") then sy = scannumber() + else break end + end + if rx == 1 and sx == 0 and sy == 0 and ry == 1 then + insert(stack,false) + else + context(savenode()) + context(setmatrixnode(rx,sx,sy,ry)) + insert(stack,store and { -rx, -sx, -sy, -ry } or true) + end +end + +implement { name = "startmatrix", actions = startmatrix } +implement { name = "stopmatrix", actions = stopsomething } + +local function startmirroring() + context(setmatrixnode(-1,0,0,1)) +end + +implement { name = "startmirroring", actions = startmirroring } +implement { name = "stopmirroring", actions = startmirroring } -- not: stopsomething |