1 files changed, 135 insertions, 0 deletions
diff --git a/tex/context/base/mkxl/typo-rep.lmt b/tex/context/base/mkxl/typo-rep.lmt
new file mode 100644
index 000000000..683b483ef
--- /dev/null
+++ b/tex/context/base/mkxl/typo-rep.lmt
@@ -0,0 +1,135 @@
+if not modules then modules = { } end modules ['typo-rep'] = {
+    version   = 1.001,
+    comment   = "companion to node-ini.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+-- This was rather boring to program (more of the same) but I could
+-- endure it by listening to a couple cd's by The Scene and The Lau
+-- on the squeezebox on my desk.
+
+local next, type, tonumber = next, type, tonumber
+
+local trace_stripping = false  trackers.register("nodes.stripping",  function(v) trace_stripping = v end)
+                               trackers.register("fonts.stripping",  function(v) trace_stripping = v end)
+
+local report_stripping = logs.reporter("fonts","stripping")
+
+local nodes           = nodes
+local enableaction    = nodes.tasks.enableaction
+
+local nuts            = nodes.nuts
+
+local getnext         = nuts.getnext
+local getchar         = nuts.getchar
+local isglyph         = nuts.isglyph
+
+local getattr         = nuts.getattr
+
+local remove_node     = nuts.remove
+local replace_node    = nuts.replace
+local copy_node       = nuts.copy
+
+local nodecodes       = nodes.nodecodes
+
+local chardata        = characters.data
+local collected       = false
+
+local a_stripping     = attributes.private("stripping")
+
+local texsetattribute = tex.setattribute
+local unsetvalue      = attributes.unsetvalue
+
+local v_reset         = interfaces.variables.reset
+
+-- todo: other namespace -> typesetters
+
+nodes.stripping  = nodes.stripping  or { } local stripping  = nodes.stripping
+stripping.glyphs = stripping.glyphs or { } local glyphs     = stripping.glyphs
+
+local function initialize()
+    for k, v in next, chardata do
+        if v.category == "cf" and not v.visible and not glyphs[k] then
+            glyphs[k] = true
+        end
+    end
+    initialize = nil
+end
+
+local function process(what,head,current,char)
+    if what == true then
+        if trace_stripping then
+            report_stripping("deleting %C from text",char)
+        end
+        head, current = remove_node(head,current,true)
+    elseif type(what) == "function" then
+        head, current = what(head,current)
+        current = getnext(current)
+        if trace_stripping then
+            report_stripping("processing %C in text",char)
+        end
+    elseif what then  -- assume node
+        head, current = replace_node(head,current,copy_node(what))
+        current = getnext(current)
+        if trace_stripping then
+            report_stripping("replacing %C in text",char)
+        end
+    end
+    return head, current
+end
+
+function nodes.handlers.stripping(head) -- use loop
+    local current = head
+    while current do
+        local char, id = isglyph(current)
+        if char then
+            -- it's more efficient to keep track of what needs to be kept
+            local todo = getattr(current,a_stripping)
+            if todo == 1 then
+                local what = glyphs[char]
+                if what then
+                    head, current = process(what,head,current,char)
+                else -- handling of spacing etc has to be done elsewhere
+                    current = getnext(current)
+                end
+            else
+                current = getnext(current)
+            end
+        else
+            current = getnext(current)
+        end
+    end
+    return head
+end
+
+local enabled = false
+
+function stripping.set(n) -- number or 'reset'
+    if n == v_reset then
+        n = unsetvalue
+    else
+        n = tonumber(n)
+        if n then
+            if not enabled then
+                if initialize then initialize() end
+                enableaction("processors","nodes.handlers.stripping")
+                enabled = true
+            end
+        else
+            n = unsetvalue
+        end
+    end
+    texsetattribute(a_stripping,n)
+end
+
+-- interface
+
+interfaces.implement {
+    name      = "setcharacterstripping",
+    public    = true,
+    protected = true,
+    actions   = stripping.set,
+    arguments = "optional"
+}