1 files changed, 123 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/font-vfc.lua b/tex/context/base/mkiv/font-vfc.lua
new file mode 100644
index 000000000..dfe6b3afc
--- /dev/null
+++ b/tex/context/base/mkiv/font-vfc.lua
@@ -0,0 +1,123 @@
+if not modules then modules = { } end modules ['font-vfc'] = {
+    version   = 1.001,
+    comment   = "companion to font-ini.mkiv and hand-ini.mkiv",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local select, type = select, type
+local insert = table.insert
+
+local fonts             = fonts
+local helpers           = fonts.helpers
+
+local setmetatableindex = table.setmetatableindex
+local makeweak          = table.makeweak
+
+-- Helpers dealing with virtual fonts: beware, these are final values so
+-- don't change the content of tables gotten this way!
+
+local push  = { "push" }
+local pop   = { "pop" }
+local dummy = { "comment" }
+
+function helpers.prependcommands(commands,...)
+    insert(commands,1,push)
+    for i=select("#",...),1,-1 do
+        local s = (select(i,...))
+        if s then
+            insert(commands,1,s)
+        end
+    end
+    insert(commands,pop)
+    return commands
+end
+
+function helpers.appendcommands(commands,...)
+    insert(commands,1,push)
+    insert(commands,pop)
+    for i=1,select("#",...) do
+        local s = (select(i,...))
+        if s then
+            insert(commands,s)
+        end
+    end
+    return commands
+end
+
+function helpers.prependcommandtable(commands,t)
+    insert(commands,1,push)
+    for i=#t,1,-1 do
+        local s = t[i]
+        if s then
+            insert(commands,1,s)
+        end
+    end
+    insert(commands,pop)
+    return commands
+end
+
+function helpers.appendcommandtable(commands,t)
+    insert(commands,1,push)
+    insert(commands,pop)
+    for i=1,#t do
+        local s = t[i]
+        if s then
+            insert(commands,s)
+        end
+    end
+    return commands
+end
+
+-- todo: maybe weak
+-- todo: maybe indirect so that we can't change them
+
+local char = setmetatableindex(function(t,k)
+ -- local v = { "char", k }
+    local v = { "slot", 0, k }
+    t[k] = v
+    return v
+end)
+
+local right = setmetatableindex(function(t,k)
+    local v = { "right", k }
+    t[k] = v
+    return v
+end)
+
+local left = setmetatableindex(function(t,k)
+    local v = { "right", -k }
+    t[k] = v
+    return v
+end)
+
+local down = setmetatableindex(function(t,k)
+    local v = { "down", k }
+    t[k] = v
+    return v
+end)
+
+local up = setmetatableindex(function(t,k)
+    local v = { "down", -k }
+    t[k] = v
+    return v
+end)
+
+-- makeweak(char)
+-- makeweak(right)
+-- makeweak(left)
+-- makeweak(up)
+-- makeweak(down)
+
+helpers.commands = utilities.storage.allocate {
+    char  = char,
+    right = right,
+    left  = left,
+    down  = down,
+    up    = up,
+    push  = push,
+    pop   = pop,
+    dummy = dummy,
+}
+