Difference between revisions of "Xml"
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(Added markup, Category:Packages, template Stub, section headings and section "Blog articles" with a link to "Parking in Westminster: An Analysis in Haskell") |
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{{Stub}} |
{{Stub}} |
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| + | == Introduction == |
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== Packages == |
== Packages == |
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Types: |
Types: |
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| − | Content, Element, CData, Attr are all instances of typeclass Node |
+ | <hask>Content, Element, CData, Attr</hask> are all instances of <hask>typeclass Node</hask> |
A Node instance is anything which has some convention for generating an Element out of it. |
A Node instance is anything which has some convention for generating an Element out of it. |
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| − | Useful notes: Content has constructors for Elem and Text. CData can be of kind CDataText. The type QName (qualified name) denotes a name with its qualifying namespace attached to it. |
+ | Useful notes: <hask>Content</hask> has constructors for <hask>Elem</hask> and <hask>Text</hask>. <hask>CData</hask> can be of kind <hask>CDataText</hask>. The type <hask>QName</hask> (qualified name) denotes a name with its qualifying namespace attached to it. |
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Read the few [[https://github.com/GaloisInc/xml/tree/master/tests test cases]] |
Read the few [[https://github.com/GaloisInc/xml/tree/master/tests test cases]] |
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Constructing |
Constructing |
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</haskell> |
</haskell> |
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| − | using node qn _, generally expands to node qn ([attrs], [content]), where it lifts any child data provided into a content list and ensures any attribute provided is lifted into an attribute list. unode just makes a name out of an unqualified name before calling node. |
+ | using node <hask>qn _</hask>, generally expands to node <hask>qn ([attrs], [content])</hask>, where it lifts any child data provided into a content list and ensures any attribute provided is lifted into an attribute list. <hask>unode</hask> just makes a name out of an unqualified name before calling node. |
<haskell> |
<haskell> |
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== Blog articles == |
== Blog articles == |
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| + | * [] |
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| − | * [http://idontgetoutmuch.wordpress.com/2013/10/23/parking-in-westminster-an-analysis-in-haskell/ Parking in Westminster: An Analysis in Haskell] |
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Latest revision as of 08:14, 20 February 2014
This article is a stub. You can help by expanding it.
Introduction
Packages
Packages on Hackage in the category XML
xml
Module name: Text.XML.Light
Types:
Content, Element, CData, Attr are all instances of typeclass Node
A Node instance is anything which has some convention for generating an Element out of it.
Useful notes: Content has constructors for Elem and Text. CData can be of kind CDataText. The type QName (qualified name) denotes a name with its qualifying namespace attached to it.
Snippets of essentials:
Read the few [test cases]
Constructing
let n = blank_name{qName = "td"}
let n2 = unqual "td"
let d = blank_cdata{cdData = "some data here"}
blank_element {elName = n, elContent = [Text d]}
using node qn _, generally expands to node qn ([attrs], [content]), where it lifts any child data provided into a content list and ensures any attribute provided is lifted into an attribute list. unode just makes a name out of an unqualified name before calling node.
unode "td" ()
unode "td" $ Attr (unqual "width") "10"
unode "td" $ "some data"
unode "tr" [Elem $ unode "td" "some data", Text $ blank_cdata{cdData = "free text"}]
Input
parseXMLDoc "<tr><td>some data here</td></tr>"
parseXML "<car><color>red</color></car><car><color>orange</color></car>"
Output
showContent $ head $ parseXML "<car><color>black</color></car>"
ppContent $ head $ parseXML "<car><color>black</color></car>"
Searching
findChildren blank_name{qName="td"} $ fromJust $ parseXMLDoc "<tr><td>child1<td>inside</td></td><skip></skip><td>child2</td></tr>"
filterChildren (\e -> (qName $ elName e) == "skip") $ fromJust $ parseXMLDoc "<tr><td>child1<td>inside</td></td><skip></skip><td>child2</td></tr>"
findAttr (blank_name{qName = "width"}) $ fromJust $ parseXMLDoc "<tr width=10><td>child1<td>inside</td></td><skip></skip><td>child2</td></tr>"
Blog articles
- []