Support #3446
closed
How can i see which attribute has an invalid value?
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Description
This stylesheet (the stylesheet is just an example) produces an error in line 4:
<xsl:stylesheet version="3.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<xsl:number count="aaa///bbb" from="aaa///bbb"></xsl:number>
</xsl:template>
</xsl:stylesheet>
My installed error listener is called with parameter e, an XPathException.
The only information i can retreive is this:
e.getLocator().getLineNumber() = 4
e.getMessage() = Unexpected token "/" at start of expression.
There is no indication which one of the two attributes is wrong. I tried
e.getCause() = null
e.getException() = null
e.getErrorObject() = null
There is also no information about the location of the error in the XPath expression. However, if i evaluate "aaa///bbb" using XPathCompiler, an exception SaxonApiException is thrown and getCause() (also an XPathException) gives me the actual location, via getLocator().getColumnNumber(), so that information seems to be available.
How can i tell which one of the attribute values is wrong (in Java code) and what the position of the error in the XPath expression is?
Thank you.
Files
Updated by Michael Kay about 7 years ago
- File exception.tiff exception.tiff added
In the attached debugger screenshot !!
you can see that XPathException.locator.containingLocation.attributeName contains the name of the attribute in error.
Of course this won't always be available and you must write your ErrorListener carefully to check that what you are looking for is actually there.
The location in this case is a NestedLocation, consisting of a ContainerLocation which identifies where the XPath expression is to be found (the line, column, element name, and attribute name in the XSL stylesheet, and in fact a reference to the actual element node in the stylesheet tree), plus local information (line and column number) for the actual error within the XPath expression.
SAX only gives us the line/column of the ">" at the end of the start tag, so we don't actually know the line number on which the attribute appears, so this is the best we can do.
Updated by Gerben Abbink about 7 years ago
Thank you very very much for your quick response, I could not find it
myself. It works perfectly: Attribute name and error offset in the XPath
expression are both available.
On Fri, Sep 15, 2017 at 1:31 PM, Saxonica Developer Community <
notifications@plan.io> wrote:
Updated by Michael Kay about 7 years ago
- Status changed from New to Resolved
Note that if you're looking for really precise information (e.g. to position a cursor on the error within the attribute value) then you need to be aware that Saxon sees the attribute after attribute-value-normalization. If you've got access to the raw attribute (which Saxon hasn't...) then you need to simulate the process of attribute-value-normalization and create a map from pre-normalization positions to post-normalization positions.
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