Modul:PageUtil

---

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local PageUtil = { suite  = "PageUtil",
                   serial = "2018-10-19",
                   item   = 0 }
--[=[
PageUtil
]=]



PageUtil.maxPages = 200



local function fault( alert, frame )
    -- Format message with class="error"
    --     alert  -- string, with message
    --     frame  -- object, if known
    -- Returns message with markup
    local scream = alert
    if frame then
        scream = string.format( "%s * %s", frame:getTitle(), scream )
    end
    return tostring( mw.html.create( "span" )
                            :addClass( "error" )
                            :wikitext( scream ) )
end -- fault()



local function flat( adjust, assembly )
    -- Replace links to pages by inner links
    --     adjust    -- string, with text
    --     assembly  -- table, with page infos
    -- Returns adjusted string
    local r = adjust
    local seek, shift, source, subst
    for k, v in pairs( assembly ) do
        source = v[ 1 ]
        shift  = v[ 2 ]
        source = ":?" .. source:gsub( " ", "[_ ]+" )
                               :gsub( "[%.%(%)%*%?%+%-]", "%1" )
                      .. "%s*"
        seek   = "%[%[%s*" .. source .. "(#[^%]]*%]%])"
        subst  = "[[%1"
        r = r:gsub( seek, subst )
        seek  = "%[%[%s*" .. source .. "(%|[^%]]*%]%])"
        subst = "[[#" .. shift .. "%1"
        r = r:gsub( seek, subst )
        seek  = "%[%[%s*(" .. source .. "%]%])"
        subst = "[[#" .. shift .. "|%1"
        r = r:gsub( seek, subst )
    end -- for k, v
    return r
end -- flat()



local function fraction( access, frame )
    -- Retrieve text from section
    --     access  -- string, with request
    --     frame   -- object
    -- Returns content, or false
    -- Uses:
    --     mw.title.new() .exists
    local r
    local seek = "^(#lstx?):%s*%[%[([^%[|%]\n]+)%]%]%s*(%S.*)%s*$"
    local scope, source, section = access:match( seek )
    if source then
        local page = mw.title.new( source )
        source = page.prefixedText
        if page.exists then
            section = mw.text.trim( section )
            if section ~= "" then
                r = frame:callParserFunction{ name = scope,
                                              args = { source,
                                                       section } }
            end
        else
            r = tostring( mw.html.create( "div" )
                                 :addClass( "error" )
                                 :wikitext( source ) )
        end
    end
    return r
end -- fraction()



local function full( access, frame, alias, assembly )
    -- Retrieve text from page
    --     access    -- string, with page name
    --     frame     -- object
    --     alias     -- number, unique
    --     assembly  -- table, with page infos
    -- Returns string with content, or nil
    -- Uses:
    --     mw.title.new() .exists
    local page = mw.title.new( access )
    local r
    if page then
        if page.exists then
            local source  = page.prefixedText
            local segment = string.format( "PageUtilMerge-%d", alias )
            local seed
            if page.namespace == 0 then
                seed = ":" .. source
            else
                seed = source
            end
            r = string.format( "%s\n%s",
                               tostring( mw.html.create( "span" )
                                                :attr( "id", segment ) ),
                               frame:expandTemplate( { title = seed } ) )
            table.insert( assembly,  { source, segment } )
        else
            r = tostring( mw.html.create( "div" )
                                 :addClass( "error" )
                                 :wikitext( page.prefixedText ) )
        end
    else
        r = string.format( "%s '%s'", "Unknown page", access )
        r = tostring( mw.html.create( "div" )
                             :addClass( "error" )
                             :wikitext( r ) )
    end
    return r
end -- full()



PageUtil.failsafe = function ( assert )
    -- Retrieve versioning and check for compliance
    -- Precondition:
    --     assert  -- string, with required version or "wikidata",
    --                or false
    -- Postcondition:
    --     Returns  string with appropriate version, or false
    local since = assert
    local r
    if since == "wikidata" then
        local item = PageUtil.item
        since = false
        if type( item ) == "number"  and  item > 0 then
            local ent = mw.wikibase.getEntity( string.format( "Q%d",
                                                              item ) )
            if type( ent ) == "table" then
                local vsn = ent:formatPropertyValues( "P348" )
                if type( vsn ) == "table"  and
                   type( vsn.value ) == "string" and
                   vsn.value ~= "" then
                    r = vsn.value
                end
            end
        end
    end
    if not r then
        if not since  or  since <= PageUtil.serial then
            r = PageUtil.serial
        else
            r = false
        end
    end
    return r
end -- PageUtil.failsafe()



PageUtil.getProtection = function ( access, action )
    -- Retrieve protection
    --     access  -- string or title or nil, with page, default: current
    --     action  -- string or nil, with action, default: edit
    -- Returns number: One of: 0, 0.5, 0.75, 1
    local t = type( access )
    local r = 0
    local p
    if t == "string" then
        t = mw.title.new( access )
    elseif t == "table" then
        t = access
    else
        t = mw.title.getCurrentTitle()
    end
    p = t.protectionLevels
    if type( p ) == "table" then
        local s
        if type( action ) == "string" then
            s = mw.text.trim( action )
            if s == "" then
                s = false
            end
        end
        p = p[ s or "edit" ]
        if type( p ) == "table" then
            for k, v in pairs( p ) do
                if v == "autoconfirmed" then
                    r = 0.5
                elseif v == "editeditorprotected" then
                    r = 0.75
                elseif v == "sysop" then
                    r = 1
                end
            end -- for k, v
        end
    end
    return r
end -- PageUtil.getProtection()



PageUtil.merge = function ( args, frame )
    -- Retrieve text
    --     args   -- table, with request
    --     frame  -- object, if available
    -- Returns string, with content
    local max = 0
    local r   = ""
    for k, v in pairs( args ) do
        if type( k ) == "number"  and
           k > max then
            max = k
        end
    end -- for k, v
    if max > 0 then
        local n     = 0
        local pages = {  { mw.title.getCurrentTitle().prefixedText,
                           "" }  }
        local mode, s, section, swallow
        if not frame then
            frame = mw.getCurrentFrame()
        end
        for i = 1, max do
            s = args[ i ]
            if s then
                swallow = s:match( "^%s*(#lstx?:[^\n]*%S)%s*$" )
                if swallow then
                    s = fraction( swallow, frame )
                    n = n + 1
                else
                    swallow = s:match( "^%s*%[%[([^%[|%]\n]+)%]%]%s*$" )
                    if swallow then
                        s = full( swallow, frame, i, pages )
                        n = n + 1
                    end
                end
                if s then
                    r = r .. mw.text.trim( s )
                end
                if n > PageUtil.maxPages then
                    s = string.format( "'''Too many pages (max. %d)'''",
                                       PageUtil.maxPages )
                    r = string.format( "%s\n\n%s",
                                       r,
                                       fault( s, frame ) )
                    break -- for i
                end
            end
        end -- for i
        r = flat( r, pages )
    end
    return r
end -- .merge()



-- Export
local p = { }

p.getProtection = function ( frame )
    local n = PageUtil.getProtection( frame.args[ 1 ], frame.args[ 2 ] )
    local t = { [ 0 ]    = "",
                [ 0.5 ]  = mw.ustring.char( 189 ),
                [ 0.75 ] = mw.ustring.char( 190 ),
                [ 1 ]    = "1" }
    return t[ n ]
end -- p.getProtection

function p.isRedirect()
    return mw.title.getCurrentTitle().isRedirect and "1"  or  ""
end -- p.isRedirect

p.merge = function ( frame )
    local lucky, r = pcall( PageUtil.merge, frame.args, frame )
    if not lucky then
        r = fault( r, frame )
    end
    return r
end -- p.merge

p.failsafe = function ( frame )
    -- Versioning interface
    local s = type( frame )
    local since
    if s == "table" then
        since = frame.args[ 1 ]
    elseif s == "string" then
        since = frame
    end
    if since then
        since = mw.text.trim( since )
        if since == "" then
            since = false
        end
    end
    return PageUtil.failsafe( since )  or  ""
end -- p.failsafe()

function p.PageUtil()
    return PageUtil
end

return p