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local M = {}
-- adds tokens to the current wait list, does not change order/unordered
M.wait = function(self, ...)
local tlist = { ... }
for _, token in ipairs(tlist) do
if type(token) ~= 'string' then
error('Wait tokens must be strings. Got '..type(token), 2)
end
table.insert(self.tokens, token)
end
end
-- set list as unordered, adds tokens to current wait list
M.wait_unordered = function(self, ...)
self.ordered = false
self:wait(...)
end
-- set list as ordered, adds tokens to current wait list
M.wait_ordered = function(self, ...)
self.ordered = true
self:wait(...)
end
-- generates a message listing tokens received/open
M.tokenlist = function(self)
local list
if #self.tokens_done == 0 then
list = 'No tokens received.'
else
list = 'Tokens received ('..tostring(#self.tokens_done)..')'
local s = ': '
for _,t in ipairs(self.tokens_done) do
list = list .. s .. '\''..t..'\''
s = ', '
end
list = list .. '.'
end
if #self.tokens == 0 then
list = list .. ' No more tokens expected.'
else
list = list .. ' Tokens not received ('..tostring(#self.tokens)..')'
local s = ': '
for _, t in ipairs(self.tokens) do
list = list .. s .. '\''..t..'\''
s = ', '
end
list = list .. '.'
end
return list
end
-- marks a token as completed, checks for ordered/unordered, checks for completeness
M.done = function(self, ...) self:_done(...) end -- extra wrapper for same error level constant as __call method
M._done = function(self, token)
if token then
if type(token) ~= 'string' then
error('Wait tokens must be strings. Got '..type(token), 3)
end
if self.ordered then
if self.tokens[1] == token then
table.remove(self.tokens, 1)
table.insert(self.tokens_done, token)
else
if self.tokens[1] then
error(('Bad token, expected \'%s\' got \'%s\'. %s'):format(self.tokens[1], token, self:tokenlist()), 3)
else
error(('Bad token (no more tokens expected) got \'%s\'. %s'):format(token, self:tokenlist()), 3)
end
end
else
-- unordered
for i, t in ipairs(self.tokens) do
if t == token then
table.remove(self.tokens, i)
table.insert(self.tokens_done, token)
token = nil
break
end
end
if token then
error(('Unknown token \'%s\'. %s'):format(token, self:tokenlist()), 3)
end
end
end
if not next(self.tokens) then
-- no more tokens, so we're really done...
self.done_cb()
end
end
-- wraps a done callback into a done-object supporting tokens to sign-off
M.new = function(done_callback)
local obj = {
tokens = {},
tokens_done = {},
done_cb = done_callback,
ordered = true, -- default for sign off of tokens
}
return setmetatable( obj, {
__call = function(self, ...)
self:_done(...)
end,
__index = M,
})
end
return M
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