https://github.com/fumieval/xml-lens

Lenses and traversals for xml-conduit
https://github.com/fumieval/xml-lens

Last synced: about 2 months ago
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Lenses and traversals for xml-conduit

• Host: GitHub
• URL: https://github.com/fumieval/xml-lens
• Owner: fumieval
• License: bsd-3-clause
• Created: 2013-06-18T12:02:09.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2023-01-26T01:45:04.000Z (almost 2 years ago)
• Last Synced: 2024-04-25T23:31:19.883Z (8 months ago)
• Language: Haskell
• Homepage:
• Size: 31.3 KB
• Stars: 48
• Watchers: 4
• Forks: 8
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • Changelog: CHANGELOG.md
  • License: LICENSE

Awesome Lists containing this project

README

        
xml-lens

========

Lenses and traversals for [xml-conduit](http://hackage.haskell.org/package/xml-conduit).

Example

========

```haskell

> doc <- Text.XML.readFile def "examples/books.xml"

> doc ^.. root . named "books" ... named "book" . attributeIs "category" "Textbooks" ... named "title" . text

["Learn You a Haskell for Great Good!","Programming in Haskell","Real World Haskell"]

> lengthOf ?? doc $ root . named "books" ... named "book"

7

> doc ^? root . named "books" ... attributeIs "category" "Joke" ... named "title" . text

Just "Functional Ikamusume"

> doc & root . named "books" ... named "book" ... named "pages" . text <>~ " pages" & renderLBS def & BL.putStrLn

```

```xml

    Haskell 98 language and libraries: the Revised Report

    Simon Peyton Jones

    272 pages

    £45.00

    Learn You a Haskell for Great Good!

    Miran Lipovaca

    360 pages

    Programming in Haskell

    Graham Hutton

    200 pages

…

```

Tips

----

* Use [cosmos](http://hackage.haskell.org/package/lens-4.19.2/docs/Control-Lens-Plated.html) to traverse over all children

* You can do or-composition of traversals with [failing](http://hackage.haskell.org/package/lens-4.19.2/docs/Control-Lens-Traversal.html#v:failing)