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polyethene
PostPosted: March 17th, 2007, 9:28 pm 
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Joined: August 11th, 2004, 1:47 am
Posts: 5346
Location: UK
A simple and easy set of functions for parsing XML content with xpath including save and load routines. Extremely fast and lightweight for AutoHotkey; nodes and attributes can be created and removed directly within your expressions without DOM traversal.

The included manual covers some of the common uses of xpath and demonstrates how to use this library. Unlike my other scripts this one is commented from the source for anyone who wants to know how it works.

Download

I'd like to thank everyone who posted suggestions, bug reports and advice.

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Last edited by polyethene on August 27th, 2009, 11:11 am, edited 6 times in total.

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n-l-i-d
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PostPosted: March 17th, 2007, 9:47 pm 
Wow! :) I'm baffled. Great work!


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Ace_NoOne
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PostPosted: March 18th, 2007, 11:35 am 
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Joined: October 10th, 2005, 10:44 am
Posts: 299
Location: Germany
That's just awesome, Titan!
Seriously impressive!

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Tuncay
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PostPosted: March 18th, 2007, 10:45 pm 
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Joined: November 7th, 2006, 9:47 pm
Posts: 1933
Location: Germany
Wow thx I was waiting for this since I know you was working on it. 8)

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majkinetor
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PostPosted: March 19th, 2007, 9:43 am 
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Joined: May 24th, 2006, 2:49 pm
Posts: 4511
Location: Belgrade
/applaud

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Ace_NoOne
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PostPosted: March 23rd, 2007, 3:12 pm 
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Joined: October 10th, 2005, 10:44 am
Posts: 299
Location: Germany
Hmm ... I can't seem to get this working - either I'm stupid, or it's a bug:

I'm trying to retrieve the latest link from the xkcd feed (see below for a snapshot of its current state).
For that I use the following code:
Code:
xkcdFeed = http://xkcd.com/rss.xml
rss := XmlDoc(xkcdFeed)
latest := XPath(rss, "/rss/channel/item[1]/link")
(not sure whether the nodes array is zero-based or one-based, but that doesn't matter here)

However, this returns the full ITEM node of the last (third) item:
Code:
<item>

 <title>Keyboards are Disgusting
  </title>

 <link>http://xkcd.com/c237.html
  </link>

 <description>&lt;img src="http://imgs.xkcd.com/comics/keyboards_are_disgusting.png" title="Alternate method: convince them to pretend it's an Etch-a-Sketch and try to erase it." alt="Alternate method: convince them to pretend it's an Etch-a-Sketch and try to erase it." />
 </description>

<guid isPermaLink="true">http://xkcd.com/c237.html
 </guid>

<pubDate>2007-03-19
 </pubDate>

</item>

I can't explain this - can anyone else?



Current contents of the xkcd feed (for reference):
Code:
<?xml version="1.0" encoding="UTF-8"?>

<rss version="2.0" xmlns:blogChannel="http://backend.userland.com/blogChannelModule">

<channel>
<title>xkcd.com</title>
<link>http://www.xkcd.com</link>
<description>xkcd.com: A webcomic of romance and math humor.</description>
<language>en</language>
<copyright>Copyright 2005-2006 Randall Munroe</copyright>
<pubDate>Fri, 23 Mar 2007 07:47:44 -0400</pubDate>
<lastBuildDate>Fri, 23 Mar 2007 07:47:44 -0400</lastBuildDate>
<managingEditor>rmunroe@gmail.com</managingEditor>
<webMaster>davean@sciesnet.net</webMaster>

<item>
<title>Blagofaire</title>
<link>http://xkcd.com/c239.html</link>
<description>&lt;img src="http://imgs.xkcd.com/comics/blagofaire.png" title="Things were better before the Structuring and the Levels." alt="Things were better before the Structuring and the Levels." /></description>
<guid isPermaLink="true">http://xkcd.com/c239.html</guid>
<pubDate>2007-03-23</pubDate>
</item>

<item>
<title>Pet Peeve #114</title>
<link>http://xkcd.com/c238.html</link>
<description>&lt;img src="http://imgs.xkcd.com/comics/pet_peeve_114.png" title="I'm reading a book, thank you very much." alt="I'm reading a book, thank you very much." /></description>
<guid isPermaLink="true">http://xkcd.com/c238.html</guid>
<pubDate>2007-03-21</pubDate>
</item>

<item>
<title>Keyboards are Disgusting</title>
<link>http://xkcd.com/c237.html</link>
<description>&lt;img src="http://imgs.xkcd.com/comics/keyboards_are_disgusting.png" title="Alternate method: convince them to pretend it's an Etch-a-Sketch and try to erase it." alt="Alternate method: convince them to pretend it's an Etch-a-Sketch and try to erase it." /></description>
<guid isPermaLink="true">http://xkcd.com/c237.html</guid>
<pubDate>2007-03-19</pubDate>
</item>

</channel>
</rss>

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polyethene
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PostPosted: March 23rd, 2007, 8:19 pm 
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The following gives me the correct result:

Code:
xkcdFeed = http://xkcd.com/rss.xml
rss := XmlDoc(xkcdFeed)
latest := XPath(rss, "/rss/channel/item[1]/link/text()")
MsgBox, %latest%

Try re-downloading XPath.ahk if it doesn't work for you. Note that the function preserves whitespace regardless of PI, so you can use the ^\s*|\s*$ regex to convert the string into a valid URI.

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Ace_NoOne
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PostPosted: March 24th, 2007, 8:57 am 
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Joined: October 10th, 2005, 10:44 am
Posts: 299
Location: Germany
Thanks Titan; I found the problem:

I had opened XPath.ahk in the browser (Firefox) and just copied the code into my file. For whatever reason, that seems to create problems; it works just fine if I actually download the file and take the code from there.

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Guest+
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PostPosted: March 24th, 2007, 7:38 pm 
Correct the link on this page - http://www.autohotkey.net/~Titan/xpath.html


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polyethene
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PostPosted: March 24th, 2007, 7:47 pm 
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Joined: August 11th, 2004, 1:47 am
Posts: 5346
Location: UK
Thanks, sorry about that.

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Guest+
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PostPosted: March 24th, 2007, 11:26 pm 
No problem 8)

btw, very nice script. It will help me a lot.


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chris_lee
PostPosted: April 4th, 2007, 11:13 am 
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Joined: April 4th, 2007, 10:23 am
Posts: 6
I tried the code
Code:
xkcdFeed = http://xkcd.com/rss.xml
rss := XmlDoc(xkcdFeed)
latest := XPath(rss, "/rss/channel/item[1]/link/text()")
MsgBox, %latest%

but I got some extra tailing bytes of 0xA0.
any idea?


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polyethene
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PostPosted: April 4th, 2007, 1:13 pm 
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http://www.xkcd.com/rss.xml is not very well-formed, it has unescaped closing tags within /rss/channel/description. I'll improve the parser to ignore such closing tags without opening ones and strip off generated whitespace (&nbsp;/0xA0) for the next version. In the meantime you could use:

Code:
xkcdFeed = http://www.xkcd.com/rss.xml ; URI
xkcdLocFeed = %A_Temp%\xkcd.xml ; local path
UrlDownloadToFile, %xkcdFeed%, %xkcdLocFeed%
FileRead, rss, %xkcdLocFeed%
StringReplace, rss, rss, /></description>, /&gt;</description>, All ; escape closing tags
rss := XmlDoc(rss) ; load as var ...
latest := XPath(rss, "/rss/channel/item[1]/link/text()")
MsgBox, %latest%


Thanks for the feedback.

Edit: now fixed in version 1.01 thanks.

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chris_lee
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PostPosted: April 9th, 2007, 4:38 am 
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Joined: April 4th, 2007, 10:23 am
Posts: 6
I tried version 1.01 and it works just fine.
Thanks a lot! :lol:


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Venia Legendi
 Post subject: Operators ">" and "="
PostPosted: April 10th, 2007, 1:53 pm 
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Joined: May 27th, 2005, 4:14 pm
Posts: 35
Hallo, 1st of all - THIS IS JUST WHAT I NEEDED, thanks.

Nevertheless I don't understand the follwing: Why ist Book2 with a price of 2.0 found by [price>2.0] and it's not found by [price=2.0]?
Code:
#Include XPath.ahk
xPath(t, "/bookstore[+1]")
loop, 5 {
    xPath(t, "/bookstore/book[+1]/title[+1]", "title" A_index)
    xPath(t, "/bookstore/book[" A_index "]/price[+1]", A_index ".0")
}
E := "[price>=2.0] " XPath(t, "/bookstore/book[price>=2.0]/title/text()")
E := E "`n[price>2.0] " XPath(t, "/bookstore/book[price>2.0]/title/text()") " -> also Book2 found?"
E := E "`n[price=2.0] " XPath(t, "/bookstore/book[price=2.0]/title/text()") " -> not found?"
E := E "`n[price=2] " XPath(t, "/bookstore/book[price=2]/title/text()") " -> not found?"
E := E "`n---" t
Gui, Add, Edit, w400 h400 ReadOnly -Wrap, %E%
Gui, Show, , xPath


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