From: TNHarris <telliamed@whoopdedo.org>
To: lua-l@lists.lua.org
Sent: Wednesday, February 6, 2013 8:01 PM
Subject: Re: xml parsing problem
On Wednesday, February 06, 2013 09:56:20 AM Jim zhang wrote:
> I try to use lxp.lom to parse xml file, but it gives empty table. Here is
> the code: -- setup XML parser
> local lom = require "lxp.lom"
>
...
>
> When I try to print out tbl[1][1]:
>
> io.write(tostring(tbl[1][cusomer_cnt]))
>
> the print out result is: nil
>
As Thomas Buergel pointed out, the LOM includes text nodes. Penlight[1] makes
working with XML more convenient. But if you just want some DOM-like methods,
it's easy enough to roll your own.
function GetElementsByTagName(root,name)
local yield = coroutine.yield
local descend = {root}
return coroutine.wrap(function()
for _,elem in ipairs(descend) do
for _,child in
ipairs(elem) do
if type(child)=='table' then
if child.tag==name then yield(child) end
if #child > 0 then descend[#descend+1] = child end
end
end
end
return nil
end)
end
for customer in GetElementsByTagName(lom.parse(xml), 'Customer') do
print("Customer:",customer.attr.CustomerID)
print("Company:",GetFirstChildByTagName(customer, 'CompanyName')[1])
end
GetFirstChildByTagName is left as an exercise for the reader. And you most
likely want to use assert to catch errors.
[1]
https://github.com/stevedonovan/Penlight/blob/master/docs/manual/06-data.md#xml
--
tom <
telliamed@whoopdedo.org>
