Module:HTMLParser

Documentation for this module may be created at Module:HTMLParser/doc

--[[
	(The MIT license)
	Copyright (c) 2013, Wouter Scherphof (wouter.scherphof@gmail.com)
	Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
	The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
	THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--]]

-- Source: https://github.com/wscherphof/lua-htmlparser/tree/master/src

local ElementNode = require("Module:HTMLParser/ElementNode")
local voidelements = require("Module:HTMLParser/voidelements")

local HtmlParser = {}

local function parse(text)
  local root = ElementNode:new(text)

  local node, descend, tpos, opentags = root, true, 1, {}
  while true do
    local openstart, name
    openstart, tpos, name = string.find(root._text,
      "<" .. -- an uncaptured starting "<"
      "(%w+)" .. -- name = the first word, directly following the "<"
      "[^>]*>", -- include, but not capture everything up to the next ">"
    tpos)
    if not name then break end
    local tag = ElementNode:new(name, node, descend, openstart, tpos)
    node = tag

    local tagst, apos = tag:gettext(), 1
    while true do
      local start, k, eq, quote, v
      start, apos, k, eq, quote = string.find(tagst,
        "%s+" .. -- some uncaptured space
        "([^%s=/>]+)" .. -- k = an unspaced string up to an optional "=" or the "/" or ">"
        "(=?)" .. -- eq = the optional; "=", else ""
        "(['\"]?)", -- quote = an optional "'" or '"' following the "=", or ""
      apos)
      if not k or k == "/>" or k == ">" then break end
      if eq == "=" then
        local pattern = "=([^%s>]*)"
        if quote ~= "" then
          pattern = quote .. "([^" .. quote .. "]*)" .. quote
        end
        start, apos, v = string.find(tagst, pattern, apos)
      end
      tag:addattribute(k, v or "")
    end

    if voidelements[string.lower(tag.name)] then
      descend = false
      tag:close()
    else
      opentags[tag.name] = opentags[tag.name] or {}
      table.insert(opentags[tag.name], tag)
    end

    local closeend = tpos
    while true do
      local closestart, closing, closename
      closestart, closeend, closing, closename = string.find(root._text, "[^<]*<(/?)(%w+)", closeend)
      if not closing or closing == "" then break end
      tag = table.remove(opentags[closename])
      closestart = string.find(root._text, "<", closestart)
      tag:close(closestart, closeend + 1)
      node = tag.parent
      descend = true
    end
  end

  return root
end
HtmlParser.parse = parse

return HtmlParser