Shawndouglas: Created as needed.

2013-10-30T23:54:33Z

Created as needed.

New page

-- Module for building complex HTML (e.g. infoboxes, navboxes) using a fluent interface.

local HtmlBuilder = {}

local metatable = {}

metatable.__index = function(t, key)
local ret = rawget(t, key)
if ret then
return ret
end

ret = metatable[key]
if type(ret) == 'function' then
return function(...)
return ret(t, ...)
end
else
return ret
end
end

metatable.__tostring = function(t)
local ret = {}
t._build(ret)
return table.concat(ret)
end

metatable._build = function(t, ret)
if t.tagName then
table.insert(ret, '<' .. t.tagName)
for i, attr in ipairs(t.attributes) do
table.insert(ret, ' ' .. attr.name .. '="' .. attr.val .. '"')
end
if #t.styles > 0 then
table.insert(ret, ' style="')
for i, prop in ipairs(t.styles) do
if type(prop) == 'string' then -- added with cssText()
table.insert(ret, prop .. ';')
else -- added with css()
table.insert(ret, prop.name .. ':' .. prop.val .. ';')
end
end
table.insert(ret, '"')
end
if t.selfClosing then
table.insert(ret, ' /')
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 and not t.unclosed and not t.selfClosing then
table.insert(ret, '</' .. t.tagName .. '>')
end
end

metatable.node = function(t, builder)
if builder then
table.insert(t.nodes, builder)
end
return t
end

metatable.wikitext = function(t, ...)
local vals = {...}
for i = 1, #vals do
if vals[i] then
table.insert(t.nodes, vals[i])
end
end
return t
end

metatable.newline = function(t)
table.insert(t.nodes, '\n')
return t
end

metatable.tag = function(t, tagName, args)
args = args or {}
args.parent = t
local builder = HtmlBuilder.create(tagName, args)
table.insert(t.nodes, builder)
return builder
end

local function getAttr(t, name)
for i, attr in ipairs(t.attributes) do
if attr.name == name then
return attr
end
end
end

metatable.attr = function(t, name, val)
if type(val) == 'string' or type(val) == 'number' then
-- 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

local attr = getAttr(t, name)
if attr then
attr.val = val
else
table.insert(t.attributes, {name = name, val = val})
end
end

return t
end

metatable.addClass = function(t, class)
if class then
local attr = getAttr(t, 'class')
if attr then
attr.val = attr.val .. ' ' .. class
else
t.attr('class', class)
end
end

return t
end

metatable.css = function(t, name, val)
if type(val) == 'string' or type(val) == 'number' then
for i, prop in ipairs(t.styles) do
if prop.name == name then
prop.val = val
return t
end
end

table.insert(t.styles, {name = name, val = val})
end

return t
end

metatable.cssText = function(t, css)
if css then
table.insert(t.styles, css)
end
return t
end

metatable.done = function(t)
return t.parent or t
end

metatable.allDone = function(t)
while t.parent do
t = t.parent
end
return t
end

function HtmlBuilder.create(tagName, args)
args = args or {}
local builder = {}
setmetatable(builder, metatable)
builder.nodes = {}
builder.attributes = {}
builder.styles = {}
builder.tagName = tagName
builder.parent = args.parent
builder.unclosed = args.unclosed or false
builder.selfClosing = args.selfClosing or false
return builder
end

return HtmlBuilder

Module:HtmlBuilder - Revision history

Shawndouglas: Created as needed.