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-- mmm.dom
-- see https://mmm.s-ol.nu/meta/mmm.dom/
export opairs
-- ordered table iterator, for stable(r) renderers
sort = (t, order_fn, only_strings) ->
with index = [k for k,v in pairs t when (not only_strings) or 'string' == type k]
table.sort index, order_fn
-- ordered next(t)
onext = (state, key) ->
state.i += state.step
{ :t, :index, :i } = state
if key = index[i]
key, t[key]
-- ordered pairs(t).
-- order_fn is optional; see table.sort
opairs = (t, order_fn, only_strings=false) ->
state = { :t, i: 0, step: 1, index: sort t, order_fn, only_strings }
onext, state, nil
void_tags = { 'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'link', 'meta', 'param', 'source', 'track', 'wbr' }
void_tags = { t,t for t in *void_tags }
element = (element) -> (...) ->
children = { ... }
-- attributes are last arguments but mustn't be a ReactiveVar
attributes = children[#children]
if 'table' == (type attributes) and not attributes.node
table.remove children
else
attributes = {}
b = "<#{element}"
for k,v in opairs attributes, nil, true
if k == 'style' and 'table' == type v
tmp = ''
for kk, vv in opairs v
tmp ..= "#{kk}: #{vv}; "
v = tmp
b ..= " #{k}=\"#{v}\""
-- if there is only one argument,
-- children can be in attributes table too
if #children == 0
children = attributes
for i,v in ipairs children
if 'string' != type v
print v
error "wrong type: #{type v}"
children[i] = '' unless v
if void_tags[element]
assert #children == 0, "void tag #{element} cannot have children!"
b .. ">"
else
b ..= ">" .. table.concat children, ''
b ..= "</#{element}>"
b
setmetatable {}, __index: (name) =>
with val = element name
@[name] = val
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