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Can't read prefix of tag with "preceding-sibling::text()"
In the document I'm trying to parse tags often have pre- and suffixes
that I need to read (e.g ... [<sometag>FOO_BAR</sometag>] ... where
I need to get the "[" and "]" if they are present).
Reading suffixes by evaluating following-sibling::text() works like
I would expect in that it gives me the text directly after a tag.
However, when I try to read the prefix of a tag by evaluating
preceding-sibling::text() I get the text after the parent tag of the
tag instead of the text directly before the tag.
You can test the behaviour by running the following snippet:
(defparameter *document-text*
"<foo>BAR-PREFIX<bar>BARTEXT</bar>BAR-SUFFIX=BAZ-PREFIX<baz>BAZTEXT</baz>BAZ-SUFFIX</foo>")
(defparameter *xml*
(cxml:parse *document-text*
(cxml:make-whitespace-normalizer
(stp::make-builder))))
(format t "~a~%" *document-text*)
(xpath:do-node-set (node (xpath:evaluate "foo" *xml*))
(let* ((bar-suffix (xpath:string-value (xpath:evaluate "bar/following-sibling::text()" node)))
(baz-prefix (xpath:string-value (xpath:evaluate "baz/preceding-sibling::text()" node)))
(baz-suffix (xpath:string-value (xpath:evaluate "baz/following-sibling::text()" node))))
(format t "bar/following-sibling::text() - expected: \"BAR-SUFFIX=BAZ-PREFIX\", got: ~s~%" bar-suffix)
(format t "baz/preceding-sibling::text() - expected: \"BAR-SUFFIX=BAZ-PREFIX\", got: ~s~%" baz-prefix)
(format t "baz/following-sibling::text() - expected: \"BAZ-SUFFIX\" , got: ~s~%" baz-suffix)))I tested it on SBCL 2.0.1.debian with Quicklisp installed on Ubuntu
20.04 using the following command ("test.lisp" contains the snippet
above):
sbcl \
--non-interactive \
--eval "(progn (ql:quickload :xpath) (ql:quickload :cxml) (ql:quickload :cxml-stp))" \
--load test.lisp \
--eval "(sb-ext:quit)"I'm relatively new to CL and it's my first time working with XPath
syntax, so if this behaviour is intended I apologize and would be
thankful for a hint as to how I can properly read text surrounding tags.
unble to quickload
when i run (ql:quickload :xpath) i get the following:
Lock on package COMMON-LISP violated when
proclaiming nil as a function while in package XPATH.
[Condition of type symbol-package-locked-error]
See also:
SBCL Manual, Package Locks [:node]
Common Lisp Hyperspec, 11.1.2.1.2 [:section]
i'm pretty new to CL so not sure what's going on. is this library still functioning? it seems to be up to date in quicklisp/ultralisp.
Evaluate works in a surprising way when starting from a particular node.
If I call xpath:evaluate with a particular node, I don't expect the node-set iterator to map through that node's parents. Currently, if I evaluate the XPath expression //c using the first b node as context, I get all four c nodes back.
ICS->CSV> (let* ((xml (cxml:parse
"<a><b><c>0</c></b><b><c>1</c></b><b><c>2</c></b><b><c>3</c></b></a>"
(cxml-stp:make-builder)))
(el (first (xpath:map-node-set->list 'identity
(xpath:evaluate "//b" xml)))))
(xpath:map-node-set->list 'identity
(xpath:evaluate "//c" el)))
(#.(CXML-STP:ELEMENT
#| :PARENT of type ELEMENT |#
:CHILDREN '(#.(CXML-STP:TEXT #| :PARENT of type ELEMENT |# :DATA "0"))
:LOCAL-NAME "c")
#.(CXML-STP:ELEMENT
#| :PARENT of type ELEMENT |#
:CHILDREN '(#.(CXML-STP:TEXT #| :PARENT of type ELEMENT |# :DATA "1"))
:LOCAL-NAME "c")
#.(CXML-STP:ELEMENT
#| :PARENT of type ELEMENT |#
:CHILDREN '(#.(CXML-STP:TEXT #| :PARENT of type ELEMENT |# :DATA "2"))
:LOCAL-NAME "c")
#.(CXML-STP:ELEMENT
#| :PARENT of type ELEMENT |#
:CHILDREN '(#.(CXML-STP:TEXT #| :PARENT of type ELEMENT |# :DATA "3"))
:LOCAL-NAME "c"))Cannot run the first example. `stp` does not exist.
After loading xpath, I can't run the preparation step out of the box, parsing the XML:
(defparameter *document*
(cxml:parse "<test a='1' b='2' xmlns:foo='http://foo'>
<child>hello world</child>
<foo:child>bar</foo:child>
</test>"
(stp:make-builder)))
=>
package STP does not exist.
It looks like cxml-stp is required.
Or if it isn't, what is an alternative to (stp:make-builder) ?
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