Class: Tes::Request::Expression

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

Constant Summary collapse

REG_EXP_CHAIN = 
/^(!)?([0-9A-Za-z_.]+)(\?|=|>=|<=|<|>|!=)?(-?[\w]+([.\d]+)?)?/

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(exp_str) ⇒ Expression

Returns a new instance of Expression.

Parameters:

  • exp_str (String) —

    表达式字符串

Raises:

  • (ArgumentError) 


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# File 'lib/tes/request/expression.rb', line 11

def initialize(exp_str)
  mt = exp_str.match(REG_EXP_CHAIN)
  raise(ArgumentError, "非法的表达式片段:\t#{exp_str}") unless mt

  @data = {}
  @data[:revert] = true if mt[1]
  @data[:left_exp] = mt[2]

  if mt[3]
    @data[:op] = mt[3]
    if mt[4]
      @data[:expect_val] = mt[4]
      if @data[:expect_val] =~ /^-?\d+(\.[\d]+)?/
        @data[:expect_val] = mt[5] ? @data[:expect_val].to_f : @data[:expect_val].to_i
      end

      # 处理前置 逻辑非 与表达式中的不等比较符
      if @data[:op] == '!='
        @data[:revert] = (@data[:revert] ? false : true)
        @data[:op] = '='
      end
    end
  end
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/tes/request/expression.rb', line 36

def data
  @data
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/tes/request/expression.rb', line 65

def <=>(other)
  return 0 if @data == other.data
  return nil if @data[:revert] != other.data[:revert] or @data[:left_exp] != other.data[:left_exp]

  if @data[:op] == other.data[:op]
    case @data[:op]
      when '=', '=='
        (@data[:expect_val] == other.data[:expect_val]) ? 0 : nil
      when '>', '>='
        @data[:expect_val] <=> other.data[:expect_val]
      when '<', '<='
        other.data[:expect_val] <=> @data[:expect_val]
      when '?', nil
        0
      else
        raise("内部错误:出现了不支持的表达式操作符号:#{@data[:op]}")
    end
  else
    case [@data[:op], other.data[:op]]
      when %w(< <=)
        ret = other.data[:expect_val] <=> @data[:expect_val]
        ret == 0 ? 1 : ret
      when %w(< =)
        @data[:expect_val] > other.data[:expect_val] ? -1 : nil
      when %w(= >)
        @data[:expect_val] > other.data[:expect_val] ? 1 : nil
      when %w(= >=)
        @data[:expect_val] >= other.data[:expect_val] ? 1 : nil
      when %w(= <)
        @data[:expect_val] < other.data[:expect_val] ? 1 : nil
      when %w(= <=)
        @data[:expect_val] <= other.data[:expect_val] ? 1 : nil
      when %w(> >=)
        ret = @data[:expect_val] <=> other.data[:expect_val]
        ret == 0 ? 1 : ret
      when %w(> =)
        @data[:expect_val] < other.data[:expect_val] ? -1 : nil
      when %w(>= =)
        @data[:expect_val] <= other.data[:expect_val] ? -1 : nil
      when %w(>= >)
        ret = @data[:expect_val] <=> other.data[:expect_val]
        ret == 0 ? -1 : ret
      when %w(<= =)
        @data[:expect_val] > other.data[:expect_val] ? -1 : nil
      when %w(<= <)
        ret = other.data[:expect_val] <=> @data[:expect_val]
        ret == 0 ? -1 : ret
      else
        nil
    end
  end
end

#match?(data) ⇒ true, false

计算数据是否满足表达式(深度解析后)

Parameters:

  • data (Object)

Returns:

  • (true, false) 


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# File 'lib/tes/request/expression.rb', line 41

def match?(data)
  op = @data[:op]
  unless data.respond_to?(:get_by_chain)
    raise(ArgumentError, 'data arg should be respond to :get_by_chain')
  else
    ret = if !op
            data.get_by_chain @data[:left_exp]
          elsif op == '?'
            chain_data = data.get_by_chain(@data[:left_exp])
            case chain_data
              when 'off', 'down', 'disable', '0', '', 0
                false
              else
                chain_data
            end
          else
            op = '==' if op == '='
            expect_val = @data[:expect_val]
            data.get_by_chain(@data[:left_exp]).send(op, expect_val)
          end
    @data[:revert] ? !ret : ret
  end
end

#to_s ⇒ Object 



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# File 'lib/tes/request/expression.rb', line 118

def to_s
  ret = [:left_exp, :op, :expect_val].map {|k| @data[k]}.join
  ret = '!' + ret if @data[:revert]
  ret
end