--[[
A module for building complex HTML from Lua using a
fluent interface.
Originally written on the English Wikipedia by
Toohool and Mr. Stradivarius.
Code released under the GPL v2+ as per:
https://en.wikipedia.org/w/index.php?diff=next&oldid=581399786
https://en.wikipedia.org/w/index.php?diff=next&oldid=581403025
@license GNU GPL v2+
@author Marius Hoch < hoo@online.de >
]]
local HtmlBuilder = {}
local util = require 'libraryUtil'
local checkType = util.checkType
local function checkTypeMulti( name, argIdx, arg, expectTypes )
local argType = type( arg )
for _, expectType in ipairs( expectTypes ) do
if argType == expectType then
return
end
end
local n = #expectTypes
local typeList
if n > 1 then
typeList = table.concat( expectTypes, ', ', 1, n - 1 ) .. ' or ' .. expectTypes[n]
else
typeList = expectTypes[1]
end
local msg = string.format( "bad argument #%d to '%s' (%s expected, got %s)",
argIdx,
name,
typeList,
type( arg )
)
error( msg, 3 )
end
local metatable = {}
local methodtable = {}
local selfClosingTags = {
area = true,
base = true,
br = true,
col = true,
command = true,
embed = true,
hr = true,
img = true,
input = true,
keygen = true,
link = true,
meta = true,
param = true,
source = true,
track = true,
wbr = true,
}
local htmlencodeMap = {
['>'] = '>',
['<'] = '<',
['&'] = '&',
['"'] = '"',
}
metatable.__index = methodtable
metatable.__tostring = function( t )
local ret = {}
t:_build( ret )
return table.concat( ret )
end
-- Get an attribute table (name, value) and its index
--
-- @param name
local function getAttr( t, name )
for i, attr in ipairs( t.attributes ) do
if attr.name == name then
return attr, i
end
end
end
-- Is this a valid attribute name?
--
-- @param s
local function isValidAttributeName( s )
-- Good estimate: http://www.w3.org/TR/2000/REC-xml-20001006#NT-Name
return s:match( '^[a-zA-Z_:][a-zA-Z0-9_.:-]*$' )
end
-- Is this a valid tag name?
--
-- @param s
local function isValidTag( s )
return s:match( '^[a-zA-Z0-9]+$' )
end
-- Escape a value, for use in HTML
--
-- @param s
local function htmlEncode( s )
-- The parentheses ensure that there is only one return value
return ( string.gsub( s, '[<>&"]', htmlencodeMap ) )
end
local function cssEncode( s )
-- XXX: I'm not sure this character set is complete.
-- bug #68011: allow delete character (\127)
return ( s:find( '[^%z\1-\127]' ) and mw.ustring or string )
.gsub( s, '[^\32-\57\60-\127]', function ( m )
return string.format( '\\%X ', mw.ustring.codepoint( m ) )
end )
end
-- Create a builder object. This is a separate function so that we can show the
-- correct error levels in both HtmlBuilder.create and metatable.tag.
--
-- @param tagName
-- @param args
local function createBuilder( tagName, args )
if tagName ~= nil and tagName ~= '' and not isValidTag( tagName ) then
error( string.format( "invalid tag name '%s'", tagName ), 3 )
end
args = args or {}
local builder = {}
setmetatable( builder, metatable )
builder.nodes = {}
builder.attributes = {}
builder.styles = {}
if tagName ~= '' then
builder.tagName = tagName
end
builder.parent = args.parent
builder.selfClosing = selfClosingTags[tagName] or args.selfClosing or false
return builder
end
-- Append a builder to the current node. This is separate from methodtable.node
-- so that we can show the correct error level in both methodtable.node and
-- methodtable.wikitext.
--
-- @param builder
local function appendBuilder( t, builder )
if t.selfClosing then
error( "self-closing tags can't have child nodes", 3 )
end
if builder then
table.insert( t.nodes, builder )
end
return t
end
methodtable._build = function( t, ret )
if t.tagName then
table.insert( ret, '<' .. t.tagName )
for i, attr in ipairs( t.attributes ) do
table.insert(
ret,
-- Note: Attribute names have already been validated
' ' .. attr.name .. '="' .. htmlEncode( attr.val ) .. '"'
)
end
if #t.styles > 0 then
table.insert( ret, ' style="' )
local css = {}
for i, prop in ipairs( t.styles ) do
if type( prop ) ~= 'table' then -- added with cssText()
table.insert( css, htmlEncode( prop ) )
else -- added with css()
table.insert(
css,
htmlEncode( cssEncode( prop.name ) .. ':' .. cssEncode( prop.val ) )
)
end
end
table.insert( ret, table.concat( css, ';' ) )
table.insert( ret, '"' )
end
if t.selfClosing then
table.insert( ret, ' />' )
return
end
table.insert( ret, '>' )
end
for i, node in ipairs( t.nodes ) do
if node then
if type( node ) == 'table' then
node:_build( ret )
else
table.insert( ret, tostring( node ) )
end
end
end
if t.tagName then
table.insert( ret, '</' .. t.tagName .. '>' )
end
end
-- Append a builder to the current node
--
-- @param builder
methodtable.node = function( t, builder )
return appendBuilder( t, builder )
end
-- Appends some markup to the node. This will be treated as wikitext.
methodtable.wikitext = function( t, ... )
local vals = {...}
for i = 1, #vals do
checkTypeMulti( 'wikitext', i, vals[i], { 'string', 'number' } )
appendBuilder( t, vals[i] )
end
return t
end
-- Appends a newline character to the node.
methodtable.newline = function( t )
t:wikitext( '\n' )
return t
end
-- Appends a new child node to the builder, and returns an HtmlBuilder instance
-- representing that new node.
--
-- @param tagName
-- @param args
methodtable.tag = function( t, tagName, args )
checkType( 'tag', 1, tagName, 'string' )
checkType( 'tag', 2, args, 'table', true )
args = args or {}
args.parent = t
local builder = createBuilder( tagName, args )
t:node( builder )
return builder
end
-- Get the value of an html attribute
--
-- @param name
methodtable.getAttr = function( t, name )
checkType( 'getAttr', 1, name, 'string' )
local attr = getAttr( t, name )
if attr then
return attr.val
end
return nil
end
-- Set an HTML attribute on the node.
--
-- @param name Attribute to set, alternative table of name-value pairs
-- @param val Value of the attribute. Nil causes the attribute to be unset
methodtable.attr = function( t, name, val )
if type( name ) == 'table' then
if val ~= nil then
error(
"bad argument #2 to 'attr' " ..
'(if argument #1 is a table, argument #2 must be left empty)',
2
)
end
local callForTable = function()
for attrName, attrValue in pairs( name ) do
t:attr( attrName, attrValue )
end
end
if not pcall( callForTable ) then
error(
"bad argument #1 to 'attr' " ..
'(table keys must be strings, and values must be strings or numbers)',
2
)
end
return t
end
checkType( 'attr', 1, name, 'string' )
checkTypeMulti( 'attr', 2, val, { 'string', 'number', 'nil' } )
-- if caller sets the style attribute explicitly, then replace all styles
-- previously added with css() and cssText()
if name == 'style' then
t.styles = { val }
return t
end
if not isValidAttributeName( name ) then
error( string.format(
"bad argument #1 to 'attr' (invalid attribute name '%s')",
name
), 2 )
end
local attr, i = getAttr( t, name )
if attr then
if val ~= nil then
attr.val = val
else
table.remove( t.attributes, i )
end
elseif val ~= nil then
table.insert( t.attributes, { name = name, val = val } )
end
return t
end
-- Adds a class name to the node's class attribute. Spaces will be
-- automatically added to delimit each added class name.
--
-- @param class
methodtable.addClass = function( t, class )
checkTypeMulti( 'addClass', 1, class, { 'string', 'number', 'nil' } )
if class == nil then
return t
end
local attr = getAttr( t, 'class' )
if attr then
attr.val = attr.val .. ' ' .. class
else
t:attr( 'class', class )
end
return t
end
-- Set a CSS property to be added to the node's style attribute.
--
-- @param name CSS attribute to set, alternative table of name-value pairs
-- @param val The value to set. Nil causes it to be unset
methodtable.css = function( t, name, val )
if type( name ) == 'table' then
if val ~= nil then
error(
"bad argument #2 to 'css' " ..
'(if argument #1 is a table, argument #2 must be left empty)',
2
)
end
local callForTable = function()
for attrName, attrValue in pairs( name ) do
t:css( attrName, attrValue )
end
end
if not pcall( callForTable ) then
error(
"bad argument #1 to 'css' " ..
'(table keys and values must be strings or numbers)',
2
)
end
return t
end
checkTypeMulti( 'css', 1, name, { 'string', 'number' } )
checkTypeMulti( 'css', 2, val, { 'string', 'number', 'nil' } )
for i, prop in ipairs( t.styles ) do
if prop.name == name then
if val ~= nil then
prop.val = val
else
table.remove( t.styles, i )
end
return t
end
end
if val ~= nil then
table.insert( t.styles, { name = name, val = val } )
end
return t
end
-- Add some raw CSS to the node's style attribute. This is typically used
-- when a template allows some CSS to be passed in as a parameter
--
-- @param css
methodtable.cssText = function( t, css )
checkTypeMulti( 'cssText', 1, css, { 'string', 'number', 'nil' } )
if css ~= nil then
table.insert( t.styles, css )
end
return t
end
-- Returns the parent node under which the current node was created. Like
-- jQuery.end, this is a convenience function to allow the construction of
-- several child nodes to be chained together into a single statement.
methodtable.done = function( t )
return t.parent or t
end
-- Like .done(), but traverses all the way to the root node of the tree and
-- returns it.
methodtable.allDone = function( t )
while t.parent do
t = t.parent
end
return t
end
-- Create a new instance
--
-- @param tagName
-- @param args
function HtmlBuilder.create( tagName, args )
checkType( 'mw.html.create', 1, tagName, 'string', true )
checkType( 'mw.html.create', 2, args, 'table', true )
return createBuilder( tagName, args )
end
mw_interface = nil
-- Register this library in the "mw" global
mw = mw or {}
mw.html = HtmlBuilder
package.loaded['mw.html'] = HtmlBuilder
return HtmlBuilder
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