53 lines
1.1 KiB
Lua
53 lines
1.1 KiB
Lua
-- Implement support for local variables.
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local stack = {}
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local restore_func = 65536 -- Reserved in firstcode
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lua.get_functions_table()[restore_func] = function()
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local level = assert(stack[tex.currentgrouplevel], 'Out of sync')
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stack[tex.currentgrouplevel] = nil
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for t,entries in next, level do
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for k,v in next, entries do
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t[k] = v
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end
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end
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end
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local restore_toks = {token.primitive_tokens.atendofgroup , token.new(restore_func, token.command_id'lua_call')}
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local put_next = token.put_next
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local runlocal = tex.runlocal
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local function put_restore_toks()
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put_next(restore_toks)
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end
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return function(t, k, v, global)
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local l = tex.currentgrouplevel
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if global then
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for i=1,l do
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local level = stack[i]
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if level then
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local saved = level[t]
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if saved then
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saved[k] = nil
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end
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end
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end
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elseif l > 0 then
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local level = stack[l]
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if not level then
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level = {}
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runlocal(put_restore_toks)
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stack[l] = level
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end
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local saved = level[t]
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if not saved then
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saved = {}
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level[t] = saved
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end
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saved[k] = saved[k] or t[k]
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end
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t[k] = v
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end
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