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Xpath position function not working properly #40

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carlows opened this issue Mar 2, 2021 · 3 comments
Open

Xpath position function not working properly #40

carlows opened this issue Mar 2, 2021 · 3 comments
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bug xpath

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@carlows
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carlows commented Mar 2, 2021 •
edited

Hi there,

First of all, thank you for the packages, they're very useful 馃殌

I've been having issues with the position function and I'm not sure if it's an issue with the htmlquery package or the xpath package, here's an example:

const htmlSample = `<!DOCTYPE html><html lang="en-US">
<head>
<title>Hello,World!</title>
</head>
<body>
<div class="test">
	<a href="/test1">Test 1</a>
</div>
<div class="test">
	<a href="/test2">Test 1</a>
</div>
<div class="test">
	<a href="/test3">Test 1</a>
</div>
</body>
</html>
`

func TestXPath(t *testing.T) {
	list := Find(testDoc, "//div[@class=\"test\" and position()=1]//a/@href")
	for _, n := range list {
		fmt.Println(InnerText(n))
	}
}

I would expect this to filter all the nodes that have the class test and have a position == 1, so only the first <a /> element. But instead, I get all the nodes. If I try position()=2 I get nothing back.

If I instead use this xpath, it gives me the correct element:

//div[@class=\"test\"][2]//a/@href

If I try this on the browser it works, so I'm not sure if it is expected that it works this way here 馃.

What could be the problem?
Thank you again!
@zhengchun
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thanks for report. it is a bug of position() in logical operation.

@carlows
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carlows commented Mar 2, 2021

Maybe I can help debugging it and open a PR, do you have an idea of where to look in the code?

@zhengchun
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Sorry, it was not about position() bug, I found if change expr to this list := htmlquery.Find(doc, "//div[position()=1 and @class=\"test\"]/a/@href") can works. I guess build.processNode() have some bug.

If you are interesting, you can start at func (l *logicalQuery) Evaluate(t iterator) interface{} {...} to debug.

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@carlows @zhengchun