Toluapp 類別存取標籤

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物件存取

當 `access` 值為 `nil`、`false` 或 `0` 時，物件即視為公開。其他任何值都表示非公開，而 tolua++ 都不在乎。所有物件的預設存取值為 `nil`，所以這個新功能並不會影響目前的使用者。

parser_hook

實作存取標籤

這個範例會實作 'parser_hook'，以尋找標籤，並將 `curr_member_access` 設為目前的存取權。它也會將 `curr_member_access` 設為私人（根據 `curr_member_access` 的預設值 `nil`）。標籤仍然能在其他容器（模組、名稱空間和主套件）中作用，但預設會是公開。

-- access_hook.lua

local access = {public = 0, protected = 1, private = 2}

function preparse_hook(p)
	-- we need to make all structs 'public' by default
	p.code = string.gsub(p.code, "(struct[^;]*{)", "%1\npublic:\n")
end


function parser_hook(s)

        local container = classContainer.curr -- get the current container
        if not container.curr_member_access and container.classtype == 'class' then
                -- default access for classes is private
                container.curr_member_access = access.private
        end

        -- try labels (public, private, etc)
        do
                local b,e,label = string.find(s, "^%s*(%w*)%s*:[^:]") -- we need to check for [^:], otherwise it would match 'namespace::type'
                if b then

                        -- found a label, get the new access value from the global 'access' table
                        if access[label] then
                                container.curr_member_access = access[label]
                        end -- else ?

                        return strsub(s, e) -- normally we would use 'e+1', but we need to preserve the [^:]
                end
        end

end

用法

$ tolua++ -L access-hook.lua package.pkg