lua-htmlparser/src/htmlparser.lua at master · aiouy/lua-htmlparser · GitHub

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local ElementNode = require("htmlparser.ElementNode")

local voidelements = require("htmlparser.voidelements")

local HtmlParser = {}

local function parse(text)

local index = 0

local root = ElementNode:new(index, 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

index = index + 1

local tag = ElementNode:new(index, 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] or {}) or tag -- kludges for the cases of closing void or non-opened tags

closestart = string.find(root._text, "<", closestart)

tag:close(closestart, closeend + 1)

node = tag.parent

descend = true

end

return root

end

HtmlParser.parse = parse

return HtmlParser

lua-htmlparser/src/htmlparser.lua at master · aiouy/lua-htmlparser · GitHub

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