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xml-motor ~ what,why,how this xml-parsing rubygem

xml-motor ~ what,why,how this xml-parsing rubygem


rubygem xml-motor
~ What it is?
~ Why you should use it?
~ How to use it?

Abhishek Kumar

March 24, 2012

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  1. xml­motor
    What it is : slide#2
    Why you should use it : slide#3-6
    How to use it : slide#7-12

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  2. Late 2011, started a new rubygem project for parsing xml, html.
    @Rubygems: http://rubygems.org/gems/xml-motor
    @GitHub : https://github.com/abhishekkr/rubygem_xml_motor
    Just created it to test out my work at compact, quick &
    easy xml­parsing algorithm... can see that
    @Slideshare: http://www.slideshare.net/AbhishekKr/xmlmotor
    So, currently this is a non­native, completely independent
    less­than­250 ruby­LOC available as a simple rubygem to
    be require­d and use in an easy freehand notation (like
    'div.img') and match with any/multiple node attributes (like
    'id=”a1”' or ['type=”color”', 'name=”white”']).

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  3. Current Features

    Has a single method access to parse require xml nodes from
    content or file.

    Use it only if you are gonna parse that xml­content once.

    For using same xml­content more than once, follow the 3­way
    step mentioned in examples on end slides.

    It doesn't depend on presence of any other system library,
    purely non­native.

    It parses broken or corrupted xml/html content correctly, just
    for the content it have.

    Can parse results on looking for node­names, attributes of
    node or both.

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  4. Uses free­freehand notation to retrieve xml nodes.
    If your xml looks like,
    ABC CBA ...


    and you look for 'book.author',
    then, you'll get back ['CBA', 'XY', 'YZ'];
    What that means is the child­node could be at any
    depth in the parent­node.
    Default return mode is without the tags, there is a
    switch to get the nodes.

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  5. To filter your nodes on the basis of attributes,
    single or multiple attributes can be provided.
    These attribute searches can be combined up
    with freehand node name searches.
    Readme (a bit weird, have to loosen it up):

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  6. Features To Come
    Work on making it more performance efficient.
    Limit over result­nodes retrieved from start/end of
    matching nodes.
    Multi­node attribute­based filter for a hierarchical
    node search.
    Add more common CSS Selector style, capability is
    already present using attribute based search... just
    need to add a mapping method.

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  7. USAGE
    code we are going to try:

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  8. say, you have an xml file 'dummy.xml', with data as




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  9. its available at rubygems.org, install it as
    $ gem install xml­motor
    include it in your ruby code,
    #!/usr/bin/env ruby
    require 'xml­motor'
    get the XML Filename and/or XML data
    fyl = File.join(File.expand_path
    (File.dirname __FILE__),'dummy.xml')
    xml = File.open(fyl,'r'){|fr| fr.read }

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  10. One-time XML-Parsing directly from file
    (fyl, 'ummy.mmy', 'class="sys"')
    ["non­native", "\n id=\"mem\">compact\n "]
    One-time XML-Parsing directly from content
    (xml, 'dummy.my', 'class="usage"')

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  11. Way to go for XML-Parsing for xml node searches
    xsplit = XMLMotor.splitter xml
    xtags = XMLMotor.indexify xsplit
    [] just normal node name based freehand notation
    to search:
    (xsplit, xtags, 'dummy.my')
    Result: ["compact", "easy"]
    [] searching for values of required nodes filtered
    by attribute:
    (xsplit, xtags, nil, 'class="usage"')
    Result: ["easy"]

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  12. [] searching for values of required nodes filtered by
    freehand tag-name notation & attribute:
    XMLMotor.xmldata(xsplit, xtags,
    'dummy.my', 'class="usage"')
    Result: ["easy"]
    [] searching for values of required nodes filtered by
    freehand tag-name notation & multiple attributes:
    XMLMotor.xmldata(xsplit, xtags,
    'dummy.my', ['class="sys"', 'id="mem"'])
    Result: ["compact"]

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