gh-63102: Add XMLPullTarget and XMLPullParser.expand() - #157439
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serhiy-storchaka wants to merge 2 commits into
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gh-63102: Add XMLPullTarget and XMLPullParser.expand()#157439serhiy-storchaka wants to merge 2 commits into
serhiy-storchaka wants to merge 2 commits into
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XMLPullTarget is a parser target for XMLPullParser and iterparse() which reports elements without building a tree. The reported object is an Element with the tag, the attributes and, for the "end" event, the text, but without children: they are reported as their own events. Nothing is kept, so a document of any size can be parsed with a constant amount of memory, like with xml.dom.pulldom, but much faster. XMLPullParser.expand() builds the subtree of a reported element from the events which are already read from the parser, like expandNode() in pulldom. The iterator returned by iterparse() has the same method which reads more data if needed.
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XMLPullTargetis a parser target forXMLPullParseranditerparse()which reports elements without building a tree.start()returns a newElementwith the tag and the attributes,end()returns the same object with its text, but the children are never attached: they are reported as their own events. Nothing is kept, so a document of any size can be parsed with a constant amount of memory, like withxml.dom.pulldom, but much faster (on a 500 000-row document: 0.28 s and 386 KiB, versus 2.2 s and 10 MiB for pulldom, and 1.7 MiB forTreeBuilderwith theclear()idiom).XMLPullParser.expand(element)is the counterpart of pulldom'sexpandNode(): it builds the subtree of a reported element from the events which are already read from the parser, and returns it.ValueErroris raised if the element is not complete yet. The iterator returned byiterparse()has the same method, which reads more data itself.Follow-up of #156888.