Pure Lua XML parser
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- Subject: Pure Lua XML parser
- From: peterhickman <peterhi@...>
- Date: 2007年12月16日 16:31:00 +0000
After playing around with the BadgerFish implementation mentioned in
a previous post I asked myself "how hard would it be to implement an
XML parser in Lua?" This is the result, here http://
peterhi.dyndns.org/plxml/index.html
It reads well formed XML strings and creates a nested table structure
that does not lose any data or structural information from the input.
<?xml version="1.0"?><doc><!-- test --><person><forename>fred</
forename><br/>smith</person><green id="1"/></doc>
Becomes
return {
data={
{ data="version=\"1.0\"", name="xml", type="pi" },
{
data={
{ data="test", type="comment" },
{
data={
{ data={ { data="fred", type="text" } },
name="forename", type="element" },
{ data={ }, name="br", type="element" },
{ data="smith", type="text" }
},
name="person",
type="element"
},
{ attributes="id=\"1\"", data={ }, name="green",
type="element" }
},
name="doc",
type="element"
}
},
type="root"
}
which can be walked over with a walk method to manipulate the tree.
It's more fully explained, with some examples, on the web page.
Now at this point it is just a programming exercise for me, I have
always meant to try and write my own XML parser and I will probably
do most of the things on the to do list. Is this something that other
people will be interested in, that is should I turn the code into
production code with tests, performance and coverage reviews and all
the usual fun and games?
--
If a pickpocket meets a saint, he sees only his pockets