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-rw-r--r--luaotfload.dtx62
1 files changed, 62 insertions, 0 deletions
diff --git a/luaotfload.dtx b/luaotfload.dtx
index 47b2595..9bf0ac9 100644
--- a/luaotfload.dtx
+++ b/luaotfload.dtx
@@ -650,6 +650,68 @@ fonts.handlers.otf.addfeature("tlig", tlig_specification)
fonts.handlers.otf.addfeature("trep", { })
% \end{macrocode}
%
+% And overriding the \context's definition of |anum|.
+%
+% \begin{macrocode}
+local anum_arabic = {
+ [0x0030] = 0x0660,
+ [0x0031] = 0x0661,
+ [0x0032] = 0x0662,
+ [0x0033] = 0x0663,
+ [0x0034] = 0x0664,
+ [0x0035] = 0x0665,
+ [0x0036] = 0x0666,
+ [0x0037] = 0x0667,
+ [0x0038] = 0x0668,
+ [0x0039] = 0x0669,
+}
+
+local anum_persian = {
+ [0x0030] = 0x06F0,
+ [0x0031] = 0x06F1,
+ [0x0032] = 0x06F2,
+ [0x0033] = 0x06F3,
+ [0x0034] = 0x06F4,
+ [0x0035] = 0x06F5,
+ [0x0036] = 0x06F6,
+ [0x0037] = 0x06F7,
+ [0x0038] = 0x06F8,
+ [0x0039] = 0x06F9,
+}
+
+local function valid(data)
+ local features = data.resources.features
+ if features then
+ for k, v in next, features do
+ for k, v in next, v do
+ if v.arab then
+ return true
+ end
+ end
+ end
+ end
+end
+
+local anum_specification = {
+ {
+ type = "substitution",
+ features = { arab = { far = true, urd = true, snd = true } },
+ data = anum_persian,
+ flags = { },
+ valid = valid,
+ },
+ {
+ type = "substitution",
+ features = { arab = { ["*"] = true } },
+ data = anum_arabic,
+ flags = { },
+ valid = valid,
+ },
+}
+
+fonts.handlers.otf.addfeature("anum",anum_specification)
+% \end{macrocode}
+%
% we provide a callback for patching fonts on the fly, to be used by other
% packages.
%