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wac

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资源说明：Wolfram|Alpha client

= 0.1 release of Wolfram|Alpha Client for ruby

This is extreme alpha code!

gem is coming soon, as are features and tests

== resources

Github for code: http://github.com/ianwhite/wac

API docs: http://ianwhite.github.com/wac/doc

== get going

  make sure nokogiri and active_support are installed as gems

  $ git clone git://github.com/ianwhite/wac.git
  $ cd wac
  $ irb
  
  > require 'rubygems' # or similar, to load up the deps
  
  > require 'lib/wac'  
  
  > Wac.appid = "YOURAPIKEY"
  
  
  # grab a query result straight away
  
  > r = Wac.fetch 'pi'
  
      => a: MathematicalFunctionIdentity (assumptions: Clash)
        - Input: pi 
        - Decimal approximation: 3.1415926535897932384626433832795028841971693993751058209749... [More digits...]
        - Property: pi is a transcendental number 
        - Continued fraction: [3; 7, 15, 1, 292, 1, 1, 1, 2, 1, 3, 1, 14, 2, 1, 1, 2, 2, 2, 2, 1, 84, 2, 1, 1, 15, ...] [Fraction form...], [More terms...]
        - Alternative representations: pi = 180 deg  [More...]
        - Series representations: pi = 4 sum_(k=0)^infinity(-1)^k/(2 k+1) [More...]
        - Integral representations: pi = 2 integral_0^infinity1/(t^2+1) dt [More...]
  
  
  # requery using an assumption
  
  > r.assumptions
  
      => [#]
  
  > r.assumptions[0][1].requery
  
      => q: "pi" (assuming a character)
  
  > r.assumptions[0][1].requery.fetch
  
      => a: Character (assumptions: Clash)
        - Input interpretation: pi  (character) 
        - Visual form:  
        - Name: Greek small letter pi 
        - Position in the Greek alphabet: 16th  letter  (10th letter from the end) 
        - Encodings: Unicode | U+03C0  (decimal: 960)
      HTML | π
      Mathematica | \[Pi] [More...]
        - Standards blocks: Unicode | Greek and Coptic  (880 through 1023)  (144 characters)
      ISO 8859 | ISO 8859-7 (Greek)  (character 240) 
  
  
  # requery using a pod state
  
  > r[1]
  
      => #
      
  > r[1].states[0].requery.fetch[1]
  
      => #
  
== Types

mixins are found/created that match the WA api results, and applied to the results.  This means you can add your own app-specific behaviour by
opening the mixins you are interested in.

For the 'pi' example above the following modules are mixed in:

  # the result is Wac::Result::MathematicalFunctionIdentity
  > r.is_a? Wac::Result::MathematicalFunctionIdentity
  => true
  
  # the pods are given mixins for their scanner attributes
  > r[0].is_a? Wac::Result::Identity
  => true
  > r[1].is_a? Wac::Result::Numeric
  => true
  
  # the assumptions are given Assumption mixins
  > r.assumptions[0].is_a? Wac::Assumption::Clash
  => true
  
  # add your own behaviour for numerics
  
    module Wac::Result::Numeric
      def to_f
        plaintext.to_f
      end
    end
    
  # now all Numeric results can be cast to floats

== Want Images?

Most pods have an image associated with them, here's an example of how to access them:

  > r = Wac.fetch "Bob Dylan, Neil Young, Woody Guthrie, Kylie Minogue"
   
    => a: City,People
      - Input interpretation: Bob Dylan  (musician)  |  Neil Young  (musician)  |  Woody Guthrie  (musician)  |  Kylie Minogue  (singer/songwriter) 
      - Basic information:  | full name | date of birth | place of birth
        Bob Dylan | Robert Allen Zimmerman | 1941  (age: 68 years) | Duluth,Minnesota
        Neil Young | Neil Percival Young | 1945  (age: 63 years) | Toronto,Ontario
        Woody Guthrie | Woodrow Wilson Guthrie | 1912  (97 years ago) | Okemah,Oklahoma
        Kylie Minogue | Kylie Ann Minogue | 1968  (age: 41 years) | Melbourne,Victoria
         | date of death | place of death
        Woody Guthrie | 1967  (age: 55 years)
        (42 years ago) | New York [Show full dates...]
      - Timeline:  
    
  # collate all the images of these in a html string
  
  > r.map {|p| p.img}.join
  
    => ""
    
  # launch these images in browser windows
  
  > require 'launchy'
  > r.each {|p| Launchy.open(p.img['src'])}

== Want HTML?

You can ask for formats in html, etc by adding options to the query or session (the session is just an options container that can issue queries).

  > s = Wac.new 'MYAPPID', :format => 'html'
  > s.fetch('pi')[1].markup
    => "
Decimal approximation:..."
    
== Other options

All of the official Wolfram Alpha API options are supported, on both sessions and queries.  In addition, you can change the query_uri to point
somewhere else.

  > s = Wac.new 'MYAPPID', :location => "Sheffield, UK"
  > q = s.query "Distance to the Moon"
  
  > q.uri
  
    => "http://api.wolframalpha.com/v1/query?appid=beta824g5&input=Distance+to+the+moon&location=Sheffield%2C+UK"
    
  > s.query_uri = "http://preview.wolframalpha.com/api/v1/query.jsp"
  > q = s.query "Distance to the Moon"
  > q.uri
  
    => "http://preview.wolframalpha.com/api/v1/query.jsp?appid=beta824g5&input=Distance+to+the+Moon&location=Sheffield%2C+UK"
    
  > q.fetch
  
    => a: Astronomical,City
      - Input interpretation: Moon | distance from Earth 
      - Current result: 230407 miles 
      - Unit conversions: 370803 km  (kilometers) 
      - Comparison as distance:  ~~ 0.96 x mean Moon-Earth distance ( 3.844x10^8 m ) 
      - Corresponding quantity: Light travel time t in vacuum from t=x/c:
         | 1.2 seconds 
      - Orbital properties: current distance from Earth | 230407 mi
        1.237 light seconds
        average distance from Earth | 239200 mi
        1.284 light seconds
        largest distance from orbit center | 252100 mi
        63.61 R_(+)
        nearest distance from orbit center | 225600 mi
        56.93 R_(+)
        orbital period | 27.322 days [Show metric...], [More...]
    
  > q = s.query "distance to Manchester"
  
    => a: City,Internet (assumptions: SubCategory)
      - Input interpretation: distance | from Sheffield to Manchester 
      - Result: 31 miles 
      - Unit conversions: 49.89 km  (kilometers) 
      - Direct travel times: aircraft  (550 mph) | 3 minutes  20 seconds
        sound | 2 minutes  20 seconds
        light in fiber | 235 micros  (microseconds)
        light in vacuum | 165 micros  (microseconds)
        (assuming direct great-circle paths) [More...]
      - Map:

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