模块:Loop

可在模块:Loop/doc创建此模块的帮助文档

local module = {}

local getArgs = require('Module:Arguments').getArgs

function pack_inner_loop(loop)
    -- 给内层循环的do参数包裹<nowiki>标签
    loop = mw.ustring.gsub(loop, '{{%s-[lL][oO][oO][pP]%s-|', '{{#invoke:loop|main|')
    return mw.ustring.gsub(loop, '({{#invoke:loop.*)', function(a)
        local i = 1
        local stack = {}
        local do_begin = -1
        local do_end = -1
        while (i < mw.ustring.len(a)) do
            if do_begin == -1 and mw.ustring.find(a, '^|%s-do%s-=', i) then
                _, do_begin = mw.ustring.find(a, '^|%s-do%s-=', i)
                do_begin = do_begin + 1
                i = do_begin
            end
            if do_begin ~= -1 then
                if mw.ustring.sub(a, i, i + 2) == '{{{' then
                    i = i + 3
                    table.insert(stack, 3)
                elseif mw.ustring.sub(a, i, i + 1) == '{{' then
                    i = i + 2
                    table.insert(stack, 2)
                elseif mw.ustring.sub(a, i, i + 2) == '}}}' then
                    if #stack ~= 0 and stack[#stack] == 3 then
                        i = i + 3
                        table.remove(stack)
                    elseif #stack ~= 0 and stack[#stack] == 2 then
                        i = i + 2
                        table.remove(stack)
                    else
                        do_end = i - 1
                        break
                    end
                elseif mw.ustring.sub(a, i, i + 1) == '}}' then
                    if #stack ~= 0 then
                        i = i + 2
                        table.remove(stack)
                    else
                        do_end = i - 1
                        break
                    end
                elseif mw.ustring.sub(a, i, i) == '|' and #stack == 0 then
                    do_end = i - 1
                    break
                else
                    i = i + 1
                end
            else
                i = i + 1
            end
        end
        if do_begin ~= -1 and do_end == -1 then do_end = i - 1 end
        if do_begin ~= -1 and do_end ~= -1 then
        -- mw.log('发现内层循环 <nowiki>'..mw.ustring.sub(a, do_begin, do_end)..'</nowiki>')
        return mw.ustring.sub(a, 1, do_begin - 1)..'<nowiki>'..
               mw.text.trim(mw.ustring.sub(a, do_begin, do_end))..'</nowiki>'..
               pack_inner_loop(mw.ustring.sub(a, do_end + 1, -1))
        else
            return a
        end
    end )
end

function _main(args, frame)
    local name = ''
    local _min = 1
    local _max = tonumber(args['max'] or args[1] or 10)
    local addend = tonumber(args[2] or 1)
    local loop = args['do'] or ''
    loop = mw.text.unstripNoWiki(loop)
    loop = string.gsub(loop, '<!%-%-.-%-%->', '')

    loop = pack_inner_loop(loop)
    local trim = mw.text.split(loop, '\n')
    loop = ''
    for i, v in ipairs(trim) do
        loop = loop..mw.text.trim(v)
    end

    for k, v in pairs(args) do
        if(k ~= 'do' and k ~= 'max' and k ~= 1 and k ~= 2) then
            name = string.gsub(k, '([%%%(%)%.%+%-%*%?%[%]%^%$])', '%%%1')
            _min = tonumber(v)
            break
        end
    end
    if name == '' then error('必须设置自增/自减的变量名！') end

    loop = mw.text.decode(loop)
    -- mw.log('循环体= '..loop)

    local result = ''
    if type(args[2]) == 'nil' and _min > _max and addend > 0 then addend = -1 end
    for i=_min, _max, addend do
        frame:callParserFunction('#vardefine', name, i)
        -- mw.log('执行循环体('..name..'='..tostring(i)..') '..loop)
        result = result..frame:preprocess(loop)
    end
    -- mw.log('循环结果 '..result)
    return result
end

function module.main(frame)
    if (frame:getParent() or frame):getTitle() == 'Template:Loop' and
        frame.args['do'] == nil then
        args = getArgs(frame)
    else
        args = frame.args
    end
    return _main(args, frame:getParent() or frame)
end

return module