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开源软件名称（OpenSource Name）：ocramz/xeno开源软件地址(OpenSource Url)：https://github.com/ocramz/xeno开源编程语言(OpenSource Language)：Haskell 98.1%开源软件介绍(OpenSource Introduction)：xeno
A fast event-based XML parser. Features
Please see the bottom of this file for guidelines on contributing to this library. Performance goalsThe hexml Haskell library uses an XML parser written in C, so that is the baseline we're trying to beat or match roughly. The Memory benchmarks for Xeno: I memory benchmarked Hexml, but most of its allocation happens in C, which GHC doesn't track. So the data wasn't useful to compare. Speed benchmarks: DOM ExampleEasy as running the parse function: > parse "<p key='val' x=\"foo\" k=\"\"><a><hr/>hi</a><b>sup</b>hi</p>"
Right
(Node
"p"
[("key", "val"), ("x", "foo"), ("k", "")]
[ Element (Node "a" [] [Element (Node "hr" [] []), Text "hi"])
, Element (Node "b" [] [Text "sup"])
, Text "hi"
])SAX ExampleQuickly dumping XML: > let input = "Text<tag prop='value'>Hello, World!</tag><x><y prop=\"x\">Content!</y></x>Trailing."
> dump input
"Text"
<tag prop="value">
"Hello, World!"
</tag>
<x>
<y prop="x">
"Content!"
</y>
</x>
"Trailing."Folding over XML: > fold const (\m _ _ -> m + 1) const const const const 0 input -- Count attributes.
Right 2> fold (\m _ -> m + 1) (\m _ _ -> m) const const const const 0 input -- Count elements.
Right 3Most general XML processor: process
:: Monad m
=> (ByteString -> m ()) -- ^ Open tag.
-> (ByteString -> ByteString -> m ()) -- ^ Tag attribute.
-> (ByteString -> m ()) -- ^ End open tag.
-> (ByteString -> m ()) -- ^ Text.
-> (ByteString -> m ()) -- ^ Close tag.
-> ByteString -- ^ Input string.
-> m ()You can use any monad you want. IO, State, etc. For example, fold openF attrF endOpenF textF closeF s str =
execState
(process
(\name -> modify (\s' -> openF s' name))
(\key value -> modify (\s' -> attrF s' key value))
(\name -> modify (\s' -> endOpenF s' name))
(\text -> modify (\s' -> textF s' text))
(\name -> modify (\s' -> closeF s' name))
str)
sThe ContributorsSee CONTRIBUTORS.md Contribution guidelinesAll contributions and bug fixes are welcome and will be credited appropriately, as long as they are aligned with the goals of this library: speed and memory efficiency. In practical terms, patches and additional features should not introduce significant performance regressions. 
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2023-10-27
2022-08-15
2022-08-17
2022-09-23
2022-08-13
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