2016-01-12 16:26:00

1 files changed, 76 insertions, 0 deletions

diff --git a/tex/context/base/mkiv/typo-wrp.lua b/tex/context/base/mkiv/typo-wrp.lua
new file mode 100644
index 000000000..394e15090
--- /dev/null
+++ b/tex/context/base/mkiv/typo-wrp.lua
@@ -0,0 +1,76 @@
+if not modules then modules = { } end modules ['typo-wrp'] = {
+    version   = 1.001,
+    comment   = "companion to typo-wrp.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+-- begin/end par wrapping stuff ... more to come
+
+local nodecodes         = nodes.nodecodes
+
+local glue_code         = nodecodes.glue
+local penalty_code      = nodecodes.penalty
+local parfill_skip_code = nodes.gluecodes.parfillskip
+local user_penalty_code = nodes.penaltycodes.userpenalty
+
+local nuts              = nodes.nuts
+local tonut             = nodes.tonut
+local tonode            = nodes.tonode
+
+local find_node_tail    = nuts.tail
+local getprev           = nuts.getprev
+local getid             = nuts.getid
+local getsubtype        = nuts.getsubtype
+local getfield          = nuts.getfield
+local remove            = nuts.remove
+
+local wrappers          = { }
+typesetters.wrappers    = wrappers
+
+local trace_wrappers    = trackers.register("typesetters.wrappers",function(v) trace_wrappers = v end)
+
+local report            = logs.reporter("paragraphs","wrappers")
+
+-- we really need to pass tail too ... but then we need to check all the plugins
+-- bah ... slowdown
+
+local function remove_dangling_crlf(head,tail)
+    if tail and getid(tail) == glue_code and getsubtype(tail) == parfill_skip_code then
+        tail = getprev(tail)
+        if tail and getid(tail) == penalty_code and getsubtype(tail) == user_penalty_code and getfield(tail,"penalty") == 10000 then
+            tail = getprev(tail)
+            if tail and getid(tail) == penalty_code and getsubtype(tail) == user_penalty_code and getfield(tail,"penalty") == -10000 then
+                if tail == head then
+                    -- can't happen
+                else
+                    if trace_wrappers then
+                        report("removing a probably unwanted end-of-par break in line %s (guess)",tex.inputlineno)
+                    end
+                    remove(head,tail,true)
+                    return head, tail, true
+                end
+            end
+        end
+    end
+    return head, tail, false
+end
+
+function wrappers.handler(head)
+    local head = tonut(head)
+    if head then
+        local tail = find_node_tail(head)
+        local done = false
+        head, tail, done = remove_dangling_crlf(head,tail) -- will be action chain
+    end
+    return head, true
+end
+
+interfaces.implement {
+    name     = "enablecrlf",
+    onlyonce = true,
+    actions  = function()
+        nodes.tasks.enableaction("processors","typesetters.wrappers.handler")
+    end
+}