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((jasmine) ->

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  # the window

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  root = @

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  # jasmines environment

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  env  = jasmine.getEnv()

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  # features we want added, describe.only and it.only

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  describeOnly = (description, specDefinitions) ->

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    suite = new jasmine.Suite(@, description, null, @currentSuite)

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    suite.exclusive_ = 1

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    @exclusive_ = Math.max(@exclusive_, 1)

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    @describe_(suite, specDefinitions)

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  itOnly = (description, func) ->

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    spec = @it(description, func)

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    spec.exclusive_ = 2

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    @exclusive_ = 2

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    spec

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  env.exclusive_ = 0

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  env.describe = (description, specDefinitions) ->

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    suite = new jasmine.Suite(@, description, null, @currentSuite)

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    @describe_(suite, specDefinitions)

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  env.describe_ = (suite, specDefinitions) ->

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    parentSuite = @currentSuite

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    if parentSuite

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      parentSuite.add suite

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    else

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      @currentRunner_.add suite

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    @currentSuite = suite

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    declarationError = null

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    try

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      specDefinitions.call suite

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    catch e

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      declarationError = e

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    if declarationError

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      @it "encountered a declaration exception", ->

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        throw declarationError

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    @currentSuite = parentSuite

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    return suite

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  env.specFilter = (spec) ->

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    @exclusive_ <= spec.exclusive_

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  env.describe.only = ->

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    describeOnly.apply(env, arguments)

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  env.it.only = ->

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    itOnly.apply(env, arguments)

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  root.describe.only = (description, specDefinitions) ->

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    env.describe.only(description, specDefinitions)

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  root.it.only = (description, func) ->

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    env.it.only(description, func)

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  # aliases

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  root.iit       = root.it.only

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  root.ddescribe = root.describe.only

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  # constructor duck punching, <3 coffeescript

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  class jasmine.Spec extends jasmine.Spec

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    constructor: (env, suite, description) ->

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      @exclusive_ = suite.exclusive_

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      super(env, suite, description)

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  class jasmine.Suite extends jasmine.Suite

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    constructor: (env, suite, specDefinitions, parentSuite) ->

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      @exclusive_ = parentSuite and parentSuite.exclusive_ or 0

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      super(env, suite, specDefinitions, parentSuite)

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) jasmine

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