1 files changed, 81 insertions, 0 deletions
diff --git a/tex/context/base/mkiv/font-imp-math.lua b/tex/context/base/mkiv/font-imp-math.lua
new file mode 100644
index 000000000..d93ece405
--- /dev/null
+++ b/tex/context/base/mkiv/font-imp-math.lua
@@ -0,0 +1,81 @@
+if not modules then modules = { } end modules ['font-imp-math'] = {
+    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"
+}
+
+if not context then return end
+
+local next, type, tonumber = next, type, tonumber
+
+local fonts              = fonts
+local helpers            = fonts.helpers
+local registerotffeature = fonts.handlers.otf.features.register
+
+local setmetatableindex  = table.setmetatableindex
+
+-- requested for latex but not supported unless really needed in context:
+--
+-- registerotffeature {
+--     name         = "ignoremathconstants",
+--     description  = "ignore math constants table",
+--     initializers = {
+--         base = function(tfmdata,value)
+--             if value then
+--                 tfmdata.mathparameters = nil
+--             end
+--         end
+--     }
+-- }
+
+-- tfmdata.properties.mathnolimitsmode = tonumber(value) or 0
+
+local splitter  = lpeg.splitat(",",tonumber)
+local lpegmatch = lpeg.match
+
+local function initialize(tfmdata,value)
+    local mathparameters = tfmdata.mathparameters
+    if mathparameters then
+        local sup, sub
+        if type(value) == "string" then
+            sup, sub = lpegmatch(splitter,value)
+            if not sup then
+                sub, sup = 0, 0
+            elseif not sub then
+                sub, sup = sup, 0
+            end
+        elseif type(value) == "number" then
+            sup, sub = 0, value
+        end
+        if sup then
+            mathparameters.NoLimitSupFactor = sup
+        end
+        if sub then
+            mathparameters.NoLimitSubFactor = sub
+        end
+    end
+end
+
+registerotffeature {
+    name         = "mathnolimitsmode",
+    description  = "influence nolimits placement",
+    initializers = {
+        base = initialize,
+        node = initialize,
+    }
+}
+
+local function initialize(tfmdata,value)
+    tfmdata.properties.nostackmath = value and true
+end
+
+registerotffeature {
+    name        = "nostackmath",
+    description = "disable math stacking mechanism",
+    initializers = {
+        base = initialize,
+        node = initialize,
+    }
+}