Class: Tes::Request::Ask

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
lib/tes/request/ask.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ask_str) ⇒ Ask

Returns a new instance of Ask.

Parameters:

  • ask_str (String) —

    单个资源的请求要求字符串



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# File 'lib/tes/request/ask.rb', line 10

def initialize(ask_str)
  snippets = ask_str.strip.sub(/^\*\d+:/, '').sub(/^&\d+\./, '').split(/\s*,\s*/)
  expressions = snippets.map { |s| Expression.new(s) }
  @data = expressions.inject({}) { |t, e| t.merge(e.data[:left_exp] => e) }
  # @reference 是表达式列表
  @reference = []
  @greedy = false
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/tes/request/ask.rb', line 19

def data
  @data
end

#greedy ⇒ Object

Returns the value of attribute greedy.



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# File 'lib/tes/request/ask.rb', line 20

def greedy
  @greedy
end

#reference ⇒ Object (readonly)

Returns the value of attribute reference.



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# File 'lib/tes/request/ask.rb', line 19

def reference
  @reference
end

Instance Method Details

#+(other) ⇒ Ask

合并叠加对资源的请求

Returns:



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# File 'lib/tes/request/ask.rb', line 85

def +(other)
  if self == other
    self
  elsif self >=other
    self
  elsif self <other
    other
  else
    raise('不能合并叠加') unless merge_able?(other)

    self_gt_other = self.-(other)
    other_gt_self = other.-(self)

    ask1 = self.new('')
    ask2 = self.new('')
    ask1.data.merge!(self.data)
    ask1.data.merge!(other_gt_self)
    ask2.data.merge!(other.data)
    ask2.data.merge!(self_gt_other)
    ask1 >= ask2 ? ask1 : ask2
  end
end

#-(other) ⇒ Ask

相对other要求多的和严格的

Returns:



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# File 'lib/tes/request/ask.rb', line 72

def -(other)
  diff_data = @data.reject do |n, e|
    o_e = other.data[n]
    o_e && e <= o_e
  end

  diff_ask = self.new('')
  diff_ask.data.merge!(diff_data)
  diff_ask
end

#<=>(other) ⇒ Object 



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# File 'lib/tes/request/ask.rb', line 28

def <=>(other)
  exp_compare_lab = -> (a, b) do
    if a.nil? and b.nil?
      0
    elsif a.nil?
      -1
    elsif b.nil?
      1
    else
      a <=> b
    end
  end

  ret = if @data == other.data
          0
        elsif self.data > other.data
          1
        elsif self.data < other.data
          -1
        else
          a_to_b_results = @data.map { |n, e| exp_compare_lab.call(e, other.data[n]) }
          if a_to_b_results.all? { |ret| ret and ret <= 0 }
            -1
          elsif a_to_b_results.all? { |ret| ret and ret >= 0 }
            # 这时必须要求other的表达式全部能被self覆盖.
            (other.data.keys - @data.keys).size > 0 ? nil : 1
          else
            nil
          end
        end
  case [greedy, other.greedy]
    when [true, false]
      return ret unless ret
      ret >=0 ? 1 : nil
    when [false, true]
      return ret unless ret
      ret <=0 ? -1 : nil
    else
      ret
  end
end

#match?(data) ⇒ Boolean

计算数据是否满足要求

Parameters:

  • data (Object)

Returns:

  • (Boolean) 


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# File 'lib/tes/request/ask.rb', line 24

def match?(data)
  @data.all? { |_n, exp| exp.match?(data) }
end

#merge_able?(other) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/tes/request/ask.rb', line 108

def merge_able?(other)
  if self.<=> other
    true
  else
    self_gt_other = self.-(other)
    other_gt_self = other.-(self)
    conflict_exp_keys = self_gt_other.data.keys & other_gt_self.data.keys
    conflict_exp_keys.empty?
  end
rescue ArgumentError
  false
end

#to_s ⇒ Object 



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# File 'lib/tes/request/ask.rb', line 121

def to_s
  @data.values.map(&:to_s).join(',')
end