lua-htmlparser/doc/sample.lua

require("luarocks.loader")
-- Omit next line in actual module clients; it's only to support development of the module itself
package.path = "../src/?.lua;" .. package.path
local htmlparser = require("htmlparser")

local io = require("io")
local file = io.input("./sample.html")
local text = io.read("*a") file:close()

local root = htmlparser.parse(text)

-- print the tree
local function p(n)
  local space = string.rep("  ", n.level)
  local s = space .. n.name
  for k,v in pairs(n.attributes) do
    s = s .. " " .. k .. "=[[" .. v .. "]]"
  end
  print(s)
  for i,v in ipairs(n.nodes) do
    p(v)
  end
end
p(root)

local function select( s )
  print ""
  print("->", s)
  local sel = root:select(s)
  for element in pairs(sel) do
    print(element.name)
  end
  print(sel:len())
end

select("*")
select("link")
select("#/contacts/4711")
select(".chapters")
select("[href]")
select("span.firstname")
select("ul[id]")

select("#/contacts/4711")
select("#/contacts/4711 *")
select("#/contacts/4711 .lastname")
select("body li[id]")

select("ul")
select("ul *")
select("ul > *")
select("body [class]")
select("body > [class]")

select(".contacts span:not(.firstname)")
select(":not(a)[href]")
select("[itemscope]:not([itemprop])")

select("link[rel='alternate']")
select("[test2=\"val='2'\"]")
select("[test5='val5']")
select("[test6='val\"\"6']")
select("[itemscope='']")
select("[itemscope=]")
select("[itemscope]")

select("[itemscope][itemprop='address']")
select("[itemscope][itemprop!='address']")
select("[itemscope][itemprop!='adres']")
select("[itemscope][itemprop!='']")
select("[hreflang|='en']")
select("[itemprop*='address']")
select("[words~='two']")
select("[words~='three']")
select("[itemprop$='ion']")
select("[hreflang^='en']")

print("\nchapters")
local sel, chapters = root("ol.chapters > li"), {}
for e in pairs(sel) do
  table.insert(chapters, e:getcontent())
end
-- print
for i,v in ipairs(chapters) do
  print(i, v)
end

print("\ncontacts")
local sel, contacts = root("ul.contacts span[class]"), {}
for e in pairs(sel) do
  local id = e.parent.parent.id -- li > a > span
  contacts[id] = contacts[id] or {}
  contacts[id][e.classes[1]] = e:getcontent()
end
-- print
for k,v in pairs(contacts) do
  print(k)
  for fk,fv in pairs(v) do
    print(fk, fv)
  end
end

print("\nmicrodata")
local sel, scopes = root("[itemprop]"), {}
for prop in pairs(sel) do
  if prop.attributes["itemscope"] then goto nextprop end
  local descendantscopes, scope = {}, prop
  while true do
    repeat
      scope = scope.parent
    until scope.attributes["itemscope"]
    if not scope.attributes["itemprop"] then break end
    table.insert(descendantscopes, 1, scope)
  end
  scopes[scope] = scopes[scope] or {}
  local entry = scopes[scope]
  for _,v in ipairs(descendantscopes) do
    entry[v] = entry[v] or {}
    entry = entry[v]
  end
  local k, v = prop.attributes["itemprop"], prop:getcontent()
  entry[k] = v
  ::nextprop::
end
-- print
local function printscope(node, table, level)
  level = level or 1
  local scopeprop = node.attributes["itemprop"] or ""
  print(string.rep("  ", level - 1) .. node.attributes["itemtype"], scopeprop)
  for prop,v in pairs(table) do
    if type(prop) == "table" then
      printscope(prop, v, level + 1)
    else
      print(string.rep("  ", level) .. prop .. "=[" .. v .. "]")
    end
  end
end
for node,table in pairs(scopes) do
  printscope(node, table)
end