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-empty tags
local sort, concat, clone = table.sort, table.concat, mw.clone
local sort, concat, clone = table.sort, table.concat, mw.clone
local match = mw.ustring.match
local match, gmatch, gsub = mw.ustring.match, mw.ustring.gmatch, mw.ustring.gsub
local lpeg = lpeg
local lpeg = lpeg
local P, S, V, C, Cg, Cb, Ct, Cf, Cmt = lpeg.P, lpeg.S, lpeg.V, lpeg.C, lpeg.Cg, lpeg.Cb, lpeg.Ct, lpeg.Cf, lpeg.Cmt
local P, S, V, C, Cg, Cb, Ct, Cf, Cmt = lpeg.P, lpeg.S, lpeg.V, lpeg.C, lpeg.Cg, lpeg.Cb, lpeg.Ct, lpeg.Cf, lpeg.Cmt
end
end
-- If there is only one chilf node, and it can be safely assimilated into the parent node:
-- Allowed CSS attributes:
local css_whitelist = to_set { 'float', 'text-align', 'vertical-align' }
-- Sanitise CSS here:
local single, double = P"'", P'"'
local style = (P'style' * spaces * equals * spaces * (
single * C ((any - single + backslash * single / "'") ^ 1) * single
+ double * C ((any - double + backslash * double / '"') ^ 1) * double
)) / function (css)
local sanitised = {}
for attr, value in gmatch (css, '(%w+)%s*:%s*([^;]+)') do
if css_whitelist [attr] then
sanitised [attr] = value
end
end
local serialised = {}
for attr, value in pairs (sanitised) do
serialised [#serialised + 1] = attr .. ': ' .. value
end
return concat (serialised, '; ')
end / function (css)
if css == '' then
return nil
else
return { name = 'style', value = css }
end
end
-- If there is only one child node, and it can be safely assimilated into the parent node:
local function assimilate (node)
local function assimilate (node)
if #node == 0 or #node > 1 then
if #node == 0 or #node > 1 then
end
end
local child = clone (node [1])
local child = clone (node [1])
if type (child) == 'string' or table_set [node.__name] and not table_set [child.__name] or table_set [child.__name] then
if type (child) == 'string' or table_set [child.__name] then
return node
return node
end
end
return node
return node
end
end
-- Serialise a parsed tag back:
local function serialise (tag)
if type (tag) == 'string' then
return tag
end
local serialised = { '<' .. tag.__name }
for attr, value in pairs (tag) do
if type (attr) ~= 'number' and attr ~= '__name' then
serialised [#serialised + 1] = attr .. '="' .. gsub (value, '"', '\\"', 1, true) .. '"'
end
end
serialised [#serialised + 1] = '>'
for _, node in ipairs (tag) do
serialised [#serialised + 1] = serialise (node)
end
serialised [#serialised + 1] = '</' .. tag.__name .. '>'
return concat (serialised, ' ')
end
local function quoted (quote)
local function quoted (quote)
return P (quote) * Cg ((any - quote + backslash * quote / quote) ^ 0, 'value') * P (quote)
return P (quote) * Cg ((any - quote + backslash * quote / quote) ^ 0, 'value') * P (quote)
end
end
local grammar = P { V'fragment' * -1,
local grammar = P { V'fragment' * -1,
fragment = (V'tag' + C (V'char' ^ 1)) ^ 0,
fragment = (V'tag' + C (V'char' ^ 1)) ^ 0,
tag = Ct (V'open' * V'fragment' * V'close' + V'void') / function (tbl)
tag = Ct (V'open' * V'fragment' * V'close' + V'void') / function (tbl)
local tag = { __name = tbl.__name }
local tag = { __name = tbl.__name } --setmetatable ({ __name = tbl.__name }, { __tostring = serialise })
for _, attr in ipairs (tbl.__attrs) do
for _, attr in ipairs (tbl.__attrs) do
tag [attr.name] = attr.value
tag [attr.name] = attr.value
end
end
for _, node in ipairs (tbl) do
for _, node in ipairs (tbl) do
tag [#tag], tag [#tag + 1] = merge_nodes (tag [#tag], node)
if #tag == 0 then
tag [1] = node
else
tag [#tag], tag [#tag + 1] = merge_nodes (tag [#tag], node)
end
end
end
if type (tag [1]) == 'string' and match (tag [1], '^%s*$') and not empty [tag.__name] then
if --[[#tag == 0 or ]]type (tag [1]) == 'string' and match (tag [1], '^%s*$') and not empty [tag.__name] then
-- An empty tag of this type can be safely dropped:
-- An empty tag of this type can be safely dropped:
return nil
return nil
void = lt * spaces * Cg (possible, '__name') * V'attributes' * spaces * slash * gt,
void = lt * spaces * Cg (possible, '__name') * V'attributes' * spaces * slash * gt,
attributes = Cg (Ct ((spaces * V'attr') ^ 0), '__attrs'),
attributes = Cg (Ct ((spaces * V'attr') ^ 0), '__attrs'),
attr = Ct (Cg ((alnum + colon + hyphen) ^ 1, 'name') * spaces
attr = style + Ct (Cg ((alnum + colon + hyphen) ^ 1, 'name') * spaces
* equals * spaces * (V'quoted' + V'unquoted')),
* equals * spaces * (V'quoted' + V'unquoted')),
quoted = quoted'"' + quoted"'",
quoted = quoted'"' + quoted"'",