Mô đun:WLink

local WLink = { suite = "WLink",
serial = "2016-10-05" };
--[=[
ansiPercent()
formatURL()
getArticleBase()
getBaseTitle()
getEscapedTitle()
getExtension()
getFile()
getFragment()
getLanguage()
getNamespace()
getPlain()
getProject()
getTarget()
getTargetPage()
getTitle()
getWeblink()
isBracketedLink()
isBracketedURL()
isCategorization()
isExternalLink()
isInterlanguage()
isInterwiki()
isMedia()
isTitledLink()
isValidLink()
isWikilink()
wikilink()
failsafe()
]=]

-- local globals
local URLutil = false;

local utilURL = function ()
-- Attach URLutil library module
-- Postcondition:
-- Returns table, with URLutil library
-- Throws error, if not available
if not URLutil then
local lucky, util = pcall( require, "Mô đun:URLutil" );
if lucky then
if type( util ) == "table" then
URLutil = util.URLutil();
end
util = "thư viện URLutil không hợp lệ";
end
if type( URLutil ) ~= "table" then
error( util, 0 );
end
end
return URLutil;
end -- utilURL()

local contentExtlink = function ( attempt )
-- Retrieve span of external link between brackets
-- Precondition:
-- attempt -- string, with presumable link
-- the first char is expected to be "["
-- Postcondition:
-- Returns string, number, number
-- string including whitespace
-- number with index of relevant "["
-- number with index after relevant "]"
-- false if nothing found
local r1 = false;
local r2 = false;
local r3 = attempt:find( "]", 2, true );
if r3 then
local s = attempt:sub( 2, r3 - 1 );
local i = s:find( "[", 1, true );
if i then
r1 = s:sub( i + 1 );
r2 = i;
else
r1 = s;
r2 = 1;
end
else
r3 = false;
end
return r1, r2, r3;
end -- contentExtlink()

local contentWikilink = function ( attempt )
-- Retrieve span of wikilink between brackets
-- Precondition:
-- attempt -- string, with presumable link
-- the first two chars are expected to be ""
-- Postcondition:
-- Returns string, number, number
-- string including whitespace
-- number with index of relevant "[["
-- number with index after relevant ""
-- false if nothing found
local r1 = false;
local r2 = false;
local r3 = attempt:find( "]]", 3, true );
if r3 then
local s = attempt:sub( 3, r3 - 1 );
local i = s:find( "[[", 1, true );
if i then
r1 = s:sub( i + 2 );
r2 = i;
else
r1 = s;
r2 = 1;
end
end
return r1, r2, r3;
end -- contentWikilink()

local extractExtlink = function ( attempt )
-- Retrieve external link
-- Precondition:
-- attempt -- string, with presumable link
-- the first char is expected to be "["
-- Postcondition:
-- Returns string, string
-- first with target and title
-- second result false if not titled
-- false if nothing found
local r1 = false;
local r2 = false;
local s = contentExtlink( attempt );
if s then
local i = s:find( "%s", 1 );
if i then
r1 = s:sub( 1, i - 1 );
r2 = mw.text.trim( s:sub( i + 1 ) );
if r2 == "" then
r2 = false;
end
else
r1 = s;
end
if r1 then
r1 = mw.text.trim( r1 );
if r1 == "" or
not utilURL().isResourceURL( r1 ) then
r1 = false;
end
end
if not r1 then
r2 = false;
end
end
return r1, r2;
end -- extractExtlink()

local extractWikilink = function ( attempt )
-- Retrieve wikilink
-- Precondition:
-- attempt -- string, with presumable link
-- the first two chars are expected to be "[["
-- Postcondition:
-- Returns string, string
-- first with target
-- second result title, or false if not piped
-- false if nothing found
local r1 = false;
local r2 = false;
local s = contentWikilink( attempt );
if s then
local i = s:find( "|", 1, true );
if i then
r1 = s:sub( 1, i - 1 );
r2 = s:sub( i + 1 );
else
r1 = s;
end
r1 = mw.text.trim( r1 );
if r1 == "" then
r1 = false;
else
r1 = r1:gsub( "_", " " )
:gsub( "&nbsp;", " " )
:gsub( "&thinsp;", " " )
:gsub( "&160;", " " )
:gsub( "&8239;", " " )
:gsub( " +", " " );
r1 = mw.text.decode( r1 );
end
end
return r1, r2;
end -- extractWikilink()

local prefix = function ( ask, ahead )
-- Interprete prefix of language or project type
-- Precondition:
-- ask -- string, with presumable prefix
-- ahead -- true, if first segment
-- Postcondition:
-- Returns string,string or nil
-- first string one of "lead", "lang", "project"
-- second string is formatted value
-- type is one of "lead", "lang", "project"
-- nil if nothing found
local r1, r2;
local prefixes = { b = true,
c = "commons",
d = true,
commons = true,
m = "meta",
mediawiki = "mw",
mw = true,
meta = true,
n = true,
q = true,
s = true,
simple = false,
v = true,
voy = true,
w = true,
wikibooks = "b",
wikidata = "d",
wikinews = "n",
wikipedia = "w",
wikiquote = "q",
wikisource = "s",
wikiversity = "v",
wikivoyage = "voy",
wikt = true,
wiktionary = "wikt"
};
local s = mw.text.trim( ask );
if s == "" then
if ahead then
r1 = "lead";
r2 = true;
end
else
local p;
s = s:lower();
p = prefixes[ s ];
if p == true then
r1 = "project";
r2 = s;
elseif p then
r1 = "project";
r2 = p;
elseif p == false then
r1 = "lang";
r2 = s;
elseif s:match( "^%l%l%l?$" )
and mw.language.isSupportedLanguage( s ) then
r1 = "lang";
r2 = s;
end
end
return r1, r2;
end -- prefix()

local target = function ( attempt, lonely )
-- Retrieve first target (wikilink or URL), or entire string
-- Precondition:
-- attempt -- string, with presumable link somewhere
-- lonely -- remove fragment, if true
-- Postcondition:
-- Returns string, number
-- string, with detected link target, or entire
-- number, with number of brackets, if found, or 2
local r1, r2 = WLink.getTarget( attempt );
if not r1 then
r1 = mw.text.trim( attempt );
r2 = 2;
end
if lonely then
local i = r1:find( "", 1, true );
if i == 1 then
r1 = "";
elseif i then
r1 = r1:sub( 1, i - 1 );
end
end
return r1, r2;
end -- target()

function WLink.ansiPercent( attempt, alter )
-- Convert string by ANSI encoding rather than UTF-8 encoding
-- Precondition:
-- attempt -- string, with presumable ANSI characters
-- alter -- string or nil, to use for spaces instead of %20
-- Postcondition:
-- Returns string, encoded
local k, s;
local r = attempt;
if alter then
r = r:gsub( " ", alter );
end
for i = mw.ustring.len( r ), 1, -1 do
k = mw.ustring.codepoint( r, i, i );
if k 126 then
if k > 255 then
s = mw.ustring.sub( r, i, i );
if k > 2047 then
s = string.format( "%%%2X%%%2X%%%2X",
s:byte( 1, 1 ),
s:byte( 2, 2 ),
s:byte( 3, 3 ) );
else
s = string.format( "%%%2X%%%2X",
s:byte( 1, 1 ),
s:byte( 2, 2 ) );
end
else
s = string.format( "%%%2X", k );
end
r = string.format( "%s%s%s",
mw.ustring.sub( r, 1, i - 1 ),
s,
mw.ustring.sub( r, i + 1 ) );
end
end -- for --i
r = mw.ustring.gsub(r, '^%', '%%2A')
return r;
end -- WLink.ansiPercent()

function WLink.formatURL( adjust )
-- Create bracketed link, if not yet
-- Precondition:
-- adjust -- string, with URL or domain/path or bracketed link
-- Postcondition:
-- Returns string, with bracketed link
-- false on invalid format
local r;
if type( adjust ) == "string" then
if WLink.isBracketedLink( adjust ) then
r = adjust;
else
local url = mw.text.trim( adjust );
local host;
utilURL();
host = URLutil.getHost( adjust );
if not host then
url = "http://" .. adjust;
host = URLutil.getHost( url );
end
if host then
local path = URLutil.getRelativePath( url );
local show;
if path == "/" then
if not url:match( "/$" ) then
url = url .. "/";
end
show = host;
else
local i = path:find( "" );
if i then
path = path:sub( 1, i - 1 );
end
show = host .. path;
end
r = string.format( "[%s %s]", url, show );
else
r = adjust;
end
end
else
r = false;
end
return r;
end -- WLink.formatURL()

function WLink.getArticleBase( attempt )
-- Retrieve generic article title, no fragment nor brackets
-- Precondition:
-- attempt -- string, with wikilink or page title
-- current page title, if missing
-- Postcondition:
-- Returns string, with identified lemma, or all
-- false on invalid format
local r;
if attempt then
local m;
r, m = target( attempt, true );
if m ~= 2 then
r = false;
end
else
r = mw.title.getCurrentTitle().text;
end
if r then
local sub = r:match( "^(.%S) %(.+%)$" );
if sub then
r = sub;
end
end
return r;
end -- WLink.getArticleBase()

function WLink.getBaseTitle( attempt )
-- Retrieve last segment in subpage, no fragment
-- Precondition:
-- attempt -- string, with wikilink or page title
-- Postcondition:
-- Returns string, with identified segment, or all
local r;
local s, m = target( attempt, true );
if m == 2 then
local sub = s:match( "/([^/]+)$" );
if sub then
r = sub;
else
r = s;
end
else
r = false;
end
return r;
end -- WLink.getBaseTitle()

function WLink.getEscapedTitle( attempt )
-- Retrieve escaped link title
-- Precondition:
-- attempt -- string, with presumable link title
-- Postcondition:
-- Returns string, with suitable link title
local s = mw.text.trim( attempt );
return s:gsub( "\n", " " )
:gsub( "%[", "&91;" )
:gsub( "%]", "&93;" )
:gsub( "|", "&124;" );
end -- WLink.getEscapedTitle()

function WLink.getExtension( attempt )
-- Retrieve media extension
-- Precondition:
-- attempt -- string, with wikilink (media link) or page title
-- if URL, PDF may be detected
-- Postcondition:
-- Returns string, with detected downcased media type
-- false if no extension found
local r = false;
local s, m = target( attempt );
if m == 2 then
s = s:match( "%.(%a+)$" );
if s then
r = s:lower();
end
elseif s:upper():match( "[%./](PDF)%W?" ) then
r = "pdf";
end
return r;
end -- WLink.getExtension()

function WLink.getFile( attempt )
-- Retrieve media page identifier
-- Precondition:
-- attempt -- string, with wikilink (media link) or page title
-- Postcondition:
-- Returns string, with detected file title
-- no namespace nor project
-- false if no file found
local r = false;
local s, m = target( attempt );
if m == 2 then
local slow = ":" .. s:lower();
local find = function ( a )
local seek = string.format( ":%s:().+%%.%%a+$",
a:lower() );
local join = slow:find( seek );
local ret;
if join then
ret = s:sub( join + a + 1 );
end
return ret;
end;
r = find( "file" );
if not r then
local trsl = mw.site.namespaces[6];
r = find( trsl.name );
if not r then
trsl = trsl.aliases;
for k, v in pairs( trsl ) do
r = find( v );
if r then
break; -- for k, v
end
end -- for k, v
end
end
end
return r;
end -- WLink.getFile()

function WLink.getFragment( attempt )
-- Retrieve fragment
-- Precondition:
-- attempt -- string, with presumable fragment
-- Postcondition:
-- Returns string, with detected fragment
-- false if no address found
local r = false;
local s, m = target( attempt );
if s then
local i = s:find( "", 1, true );
if i then
if i > 1 then
s = s:sub( i - 1 );
i = 2;
end
if s:find( "&", 1, true ) then
s = mw.text.decode( s );
i = s:find( "", 1, true );
if not i then
s = "";
i = 0;
end
end
s = s:sub( i + 1 );
r = mw.text.trim( s );
if r == "" then
r = false;
elseif m == 2 then
r = r:gsub( "%.(%x%x)", "%%%1" )
:gsub( "_", " " );
r = mw.uri.decode( r, "PATH" );
end
end
end
return r;
end -- WLink.getFragment()

function WLink.getLanguage( attempt )
-- Retrieve language project identifier
-- Precondition:
-- attempt -- string, with wikilink or page title
-- Postcondition:
-- Returns string, with detected downcased language identifier
-- false if no project language found
local r = false;
local s, m = WLink.getTarget( attempt );
if m == 2 then
local w = WLink.wikilink( s );
if w and w.lang then
r = w.lang;
end
end
return r;
end -- WLink.getLanguage()

function WLink.getNamespace( attempt )
-- Retrieve namespace number
-- Precondition:
-- attempt -- string, with wikilink or page title
-- Postcondition:
-- Returns number, of detected namespace
-- false if no namespace found
local r = false;
local s, m = WLink.getTarget( attempt );
if m == 2 then
local w = WLink.wikilink( s );
if w and not w.lang and not w.project and w.ns then
r = w.ns;
end
end
return r;
end -- WLink.getNamespace()

function WLink.getPlain( attempt )
-- Retrieve text with all links replaced by link titles
-- Precondition:
-- attempt -- string, with wikitext
-- Postcondition:
-- Returns string, with modified wikitext without links
local r = attempt;
local i = 1;
local j, k, n, lean, s, shift, space, suffix;
while ( true ) do
j = r:find( "[", i, true );
if j then
suffix = r:sub( j );
i = j + 1;
lean = ( r:byte( i, i ) == 91 );
if lean then
s, k, n = contentWikilink( suffix );
else
s, k, n = contentExtlink( suffix );
end
if s then
if k > 1 then
n = n - k;
i = j + k;
j = i - 1;
suffix = r:sub( j );
end
if lean then
s, shift = extractWikilink( suffix );
if s then
space = s:match( "^([^:]+):" );
if space then
space = mw.site.namespaces[ space ];
if space then
space = space.id;
end
end
if space 6 or space 14 then
shift = "";
elseif not shift then
shift = s;
end
else
s = "";
shift = "";
end
else
s, shift = extractExtlink( suffix );
if not s then
s = "";
end
if not shift then
shift = "";
end
i = i - 1;
end
if j > 1 then
s = r:sub( 1, j - 1 );
else
s = "";
end
r = string.format( "%s%s%s",
s, shift, r:sub( n + i ) );
i = i + shift;
else
break; -- while true
end
else
break; -- while true
end
end -- while true
return r;
end -- WLink.getPlain()

function WLink.getProject( attempt )
-- Retrieve wikifarm project identifier
-- Precondition:
-- attempt -- string, with wikilink or page title
-- Postcondition:
-- Returns string, with detected downcased project identifier
-- false if no project identifier found
local r = false;
local s, m = WLink.getTarget( attempt );
if m == 2 then
local w = WLink.wikilink( s );
if w and w.project then
r = w.project;
end
end
return r;
end -- WLink.getProject()

function WLink.getTarget( attempt )
-- Retrieve first target (wikilink or URL)
-- Precondition:
-- attempt -- string, with presumable link somewhere
-- Postcondition:
-- Returns string, number
-- string, with first detected link target
-- number, with number of brackets, if found
-- false if nothing found
local r1 = false;
local r2 = false;
local i = attempt:find( "[", 1, true );
if i then
local m;
r1 = attempt:sub( i );
if r1:byte( 2, 2 ) == 91 then
m = 2;
r1 = extractWikilink( r1 );
else
m = 1;
r1 = extractExtlink( r1 );
end
if r1 then
r2 = m;
end
else
r1 = attempt:match( "%A?([hf]t?tps?://%S+)%s?" );
if r1 then
if utilURL().isResourceURL( r1 ) then
r2 = 0;
else
r1 = false;
end
else
r1 = false;
end
end
return r1, r2;
end -- WLink.getTarget()

function WLink.getTargetPage( attempt )
-- Retrieve first target page (page name or URL of page)
-- Precondition:
-- attempt -- string, with presumable link somewhere
-- Postcondition:
-- Returns string, with first detected linked page
-- false if nothing found
local r1, r2 = WLink.getTarget( attempt );
if r1 then
local i = r1:find( "", 1, true );
if i then
if i == 1 then
r1 = false;
else
r1 = mw.text.trim( r1:sub( 1, i - 1 ) );
end
end
end
return r1, r2;
end -- WLink.getTargetPage()

function WLink.getTitle( attempt )
-- Retrieve first link title (wikilink or URL), or wikilink target
-- Precondition:
-- attempt -- string, with presumable link somewhere
-- Postcondition:
-- Returns string, with first detected link target
-- false if nothing found
local r = false;
local i = attempt:find( "[", 1, true );
if i then
local s1, s2;
r = attempt:sub( i );
if r:byte( 2, 2 ) == 91 then
s1, s2 = extractWikilink( r );
if s2 then
r = s2;
else
r = s1;
end
else
s1, r = extractExtlink( r );
end
end
return r;
end -- WLink.getTitle()

function WLink.getWeblink( attempt, anURLutil )
-- Retrieve bracketed link from resource URL
-- Precondition:
-- attempt -- string, with URL, or something different
-- anURLutil -- library module object, or nil
-- Postcondition:
-- Returns string, with first detected link target
-- false if nothing found
local second = ".ac.co.go.gv.or.";
local r;
if type( anURLutil ) == "table" then
URLutil = anURLutil;
else
utilURL();
end
if URLutil.isResourceURL( attempt ) then
local site = URLutil.getAuthority( attempt );
local show;
if attempt == site then
site = site .. "/";
end
show = URLutil.getTop3domain( "//" .. site );
if show then
local scan = "[%./](%a+)(%.%l%l%.)(%a+)$";
local search = "." .. show;
local s1, s2, s3 = search:match( scan );
if s2 then
if not second:find( s2, 1, true ) then
show = string.format( "%s.%s", s2, s3 );
end
else
show = false;
end
end
if not show then
show = URLutil.getTop2domain( "//" .. site );
if not show then
show = URLutil.getHost( "//" .. site );
end
end
r = string.format( "[%s %s]", attempt, show );
else
r = attempt;
end
return r;
end -- WLink.getWeblink()

function WLink.isBracketedLink( attempt )
-- Does attempt match a bracketed link?
-- Precondition:
-- attempt -- string, with presumable link somewhere
-- Postcondition:
-- Returns boolean
local r = false;
local i = attempt:find( "[", 1, true );
if i then
local s = attempt:sub( i );
if s:byte( 2, 2 ) == 91 then
s = extractWikilink( s );
else
s = extractExtlink( s );
end
if s then
r = true;
end
end
return r;
end -- WLink.isBracketedLink()

function WLink.isBracketedURL( attempt )
-- Does attempt match a bracketed URL?
-- Precondition:
-- attempt -- string, with presumable link somewhere
-- Postcondition:
-- Returns boolean
local s, r = WLink.getTarget( attempt );
return ( r == 1 );
end -- WLink.isBracketedURL()

function WLink.isCategorization( attempt )
-- Does attempt match a categorization?
-- Precondition:
-- attempt -- string, with presumable link somewhere
-- Postcondition:
-- Returns boolean
local r = false;
local s, m = WLink.getTarget( attempt );
if m == 2 then
local w = WLink.wikilink( s );
if w and w.ns == 14
and not ( w.lead or w.lang or w.project )
and w.title ~= "" then
r = true;
end
end
return r;
end -- WLink.isCategorization()

function WLink.isExternalLink( attempt )
-- Does attempt match an external link?
-- Precondition:
-- attempt -- string, with presumable link somewhere
-- Postcondition:
-- Returns boolean
local s, r = WLink.getTarget( attempt );
if r then
r = ( r 4 then
k = 4;
else
k = n - 1;
end
j = k;
for i = 1, j do
s = mw.text.trim( got[ i ] );
if s ~= "" then
o = mw.site.namespaces[ mw.text.trim( got[ i ] ) ];
if o then
r.ns = o.id;
r.space = o.name;
k = i + 1;
j = i - 1;
break; -- for i
end
end
end -- for i
for i = 1, j do
o, v = prefix( got[ i ], ( i == 1 ) );
if o then
if r[ o ] then
k = i;
break; -- for i
else
r[ o ] = v;
end
else
k = i;
break; -- for i
end
end -- for i
for i = k, n do
r.title = r.title .. got[ i ];
if i WLink.serial then
r = false;
else
r = WLink.serial;
end
return r
end -- WLink.failsafe()

local function Template( frame, action, leave, lone )
-- Run actual code from template transclusion
-- Precondition:
-- frame -- object
-- action -- string, with function name
-- leave -- true: keep whitespace around
-- lone -- true: permit call without parameters
-- Postcondition:
-- Return string; might be error message
local lucky = true;
local s = false;
local r = false;
local space;
for k, v in pairs( frame.args ) do
if k == 1 then
if leave then
s = v;
else
s = mw.text.trim( v );
end
elseif action "ansiPercent" and k "space" then
if v ~= "" then
space = v;
end
elseif k ~= "template" then
lucky = false;
if r then
r = r .. "|";
else
r = "Unknown parameter: ";
end
r = string.format( "%s%s=", r, k );
end
end -- for k, v
if lucky then
if s or lone then
lucky, r = pcall( WLink[ action ], s, space );
else
r = "Parameter missing";
lucky = false;
end
end
if lucky then
if type( r ) == "boolean" then
if r then
r = "1";
else
r = "";
end
end
else
r = string.format( "%s", r );
end
return r;
end -- Template()

-- Export
local p = { };

p.ansiPercent = function ( frame )
return Template( frame, "ansiPercent" );
end
p.formatURL = function ( frame )
return Template( frame, "formatURL" );
end
p.getArticleBase = function ( frame )
return Template( frame, "getArticleBase", false, true );
end
p.getBaseTitle = function ( frame )
return Template( frame, "getBaseTitle" );
end
p.getEscapedTitle = function ( frame )
return Template( frame, "getEscapedTitle" );
end
p.getExtension = function ( frame )
return Template( frame, "getExtension" );
end
p.getFile = function ( frame )
return Template( frame, "getFile" );
end
p.getFragment = function ( frame )
return Template( frame, "getFragment" );
end
p.getInterwiki = function ( frame )
return Template( frame, "getInterwiki" );
end
p.getLanguage = function ( frame )
return Template( frame, "getLanguage" );
end
p.getNamespace = function ( frame )
return tostring( Template( frame, "getNamespace" ) );
end
p.getPlain = function ( frame )
return Template( frame, "getPlain" );
end
p.getProject = function ( frame )
return Template( frame, "getProject" );
end
p.getTarget = function ( frame )
return Template( frame, "getTarget" );
end
p.getTargetPage = function ( frame )
return Template( frame, "getTargetPage" );
end
p.getTitle = function ( frame )
return Template( frame, "getTitle" );
end
p.getWeblink = function ( frame )
return Template( frame, "getWeblink" );
end
p.isBracketedLink = function ( frame )
return Template( frame, "isBracketedLink" );
end
p.isBracketedURL = function ( frame )
return Template( frame, "isBracketedURL" );
end
p.isCategorization = function ( frame )
return Template( frame, "isCategorization" );
end
p.isExternalLink = function ( frame )
return Template( frame, "isExternalLink" );
end
p.isInterlanguage = function ( frame )
return Template( frame, "isInterlanguage" );
end
p.isInterwiki = function ( frame )
return Template( frame, "isInterwiki" );
end
p.isMedia = function ( frame )
return Template( frame, "isMedia" );
end
p.isTitledLink = function ( frame )
return Template( frame, "isTitledLink" );
end
p.isValidLink = function ( frame )
return Template( frame, "isValidLink" );
end
p.isWeblink = function ( frame )
return Template( frame, "isWeblink" );
end
p.isWikilink = function ( frame )
return Template( frame, "isWikilink" );
end
p.failsafe = function ( frame )
local since = frame.args[ 1 ];
if since then
since = mw.text.trim( since );
if since == "" then
since = false;
end
end
return WLink.failsafe( since ) or "";
end
p.WLink = function ()
return WLink;
end

return p;