Class: Codex

Inherits:
Object
  • Object
show all
Defined in:
lib/codex.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(db, agg_db) ⇒ Codex

Returns a new instance of Codex.



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# File 'lib/codex.rb', line 7

def initialize(db,agg_db)
  
  # helper procs
  info = Proc.new do |node|
    normal_node(node) do |n, norm|
      norm.pretty_complexity.map { |k,v| v }.reduce(:+)
    end
  end
  func_info = Proc.new do |node|
    normal_node(node) do |n, norm|
      norm.pretty_complexity[:send] || 0
    end
  end
  type = Proc.new { |node| node.is_a?(AST::Node) ? node.type.to_s : node.class.to_s }
  func_name = Proc.new do |node|
    if type.call(node.children.first) == "const" 
      node.children.first.children[1].to_s + "." + node.children[1].to_s
    else
      node.children[1].to_s
    end
  end

  key = {
    :type => type
  }

  data_core = {
    :file => Proc.new { |node, f, p| f },
    :project => Proc.new { |node, f, p| p },
    :line => Proc.new { |node, f, p| node.loc ? node.loc.line : nil },
    :info => info,
    :func_info => func_info,
    :orig_code => Proc.new { |node, f, p| Unparser.unparse(node) rescue nil },
  }

  combine = {
    :files => Proc.new { |v| v.map { |x| x[:file] }.uniq },
    :file_count => Proc.new { |v| v.map { |x| x[:file] }.uniq.count },
    :projects => Proc.new { |v| v.map { |x| x[:project] }.uniq },
    :project_count => Proc.new { |v| v.map { |x| x[:project] }.uniq.count },
    :orig_code => Proc.new { |v| v.sample(10).map do |x| 
        {:code => x[:orig_code], :file => x[:file], :line => x[:line]} 
      end.uniq },
    :count => Proc.new { |v| v.map { |x| x[:orig_code] }.count },
    :info => Proc.new { |v| v.first[:info] }, # some process may overwrite
    :func_info => Proc.new { |v| v.first[:func_info] }
  }

  @block = DataNode.new(
    db, agg_db,
    Proc.new { |x| x.type == :block}, 
    key.merge({ 
      :func => Proc.new { |x| func_name.call(x.children.first) },
      :body => Proc.new { |x| normalize_nodes(x.children.last) },
      :arg_size => Proc.new { |x| x.children[1].children.size },
      :ret_val => Proc.new do |x| 
          body = x.children.last
          ret = type.call(body) == "begin" ? body.children.last : body
          typ = type.call(ret)
          typ == "send" ? func_name.call(ret) : typ
        end,
      :norm_code => Proc.new { |x| 
        normal_node(x) do |x|
          Unparser.unparse(x.updated(nil, x.children.map.with_index do |y,i|
            i == 0 ? without_caller(y) : y
          end)) rescue nil
        end } 
    }),
    data_core.merge({
      :args => Proc.new { |x| x.children[1].children.map{ |y| y.children[0].to_s }} 
    }),
    combine.merge({
      :args_list => Proc.new { |v| v.map { |x| x[:args] } }
    }),
    Proc.new { |db,keys,vals|
      query = db.where(:type => keys[:type], :func => keys[:func], :ret_val => keys[:ret_val]).first
      query_count = query.nil? ? 0 : query.count
      blocks = db.where(:type => keys[:type], :func => keys[:func]).sum(:count)
      rets = db.where(:type => keys[:type], :ret_val => keys[:ret_val]).sum(:count)
      if query_count <= 0
        { :keys => keys,
          :message => 
            "We've seen #{keys[:func]} blocks returning #{keys[:ret_val]} only #{query_count.to_s} " +
            "times, though we've seen #{keys[:func]} blocks #{blocks.to_s} times and #{keys[:ret_val]} " +
            "returned #{rets.to_s} times."
        } if blocks > 0 && rets > 0
      end
    }
  )

  @func = DataNode.new(
    db, agg_db,
    Proc.new { |x| x.type == :send}, 
    key.merge({ 
      :func => Proc.new { |x| func_name.call(x) },
      :norm_code => Proc.new { |x| normal_node(x) { |x| Unparser.unparse(without_caller(x)) rescue nil } },
      :sig => Proc.new { |x| x.children.drop(2).map { |y| type.call(y) } }
    }),
    data_core,
    combine,
    Proc.new { |db,keys,values| 
      query = db.where(keys).first
      query_count = query.nil? ? 0 : query.count
      func = db.where(:type => keys[:type], :func => keys[:func]).sort(:count => -1).limit(1).first
      alt_count = func.nil? ? 0 : func.count
      { :keys => keys,
        :message =>
          "Function call #{keys[:norm_code]} has appeared #{query_count.to_s} times, but " +
          "#{func.norm_code} has appeared #{alt_count.to_s} times."
      } if alt_count > 10 * (query_count + 1)
    }
  )

  @func_chain = func = DataNode.new(
    db, agg_db,
    Proc.new { |x| x.type == :send && type.call(x.children.first) == "send" }, 
    key.merge({ 
      :type => Proc.new { "func_chain" },
      :f1 => Proc.new { |x| func_name.call(x) },
      :f2 => Proc.new { |x| func_name.call(x.children.first) }
    }),
    data_core.merge({
      :info => Proc.new { 0 },
      :func_info => Proc.new { 0 }
    }),
    combine,
    Proc.new do |db,keys,data|
      query = db.where(keys).first
      if query.nil? || query.count <= 0
        fs = [:f1,:f2].map { |f| db.where(:type => "send", :func => keys[f]).size }
        { :keys => keys, 
          :message => 
            "Function #{keys[:f1]} has appeared #{fs[0].to_s} times " +
            "and #{keys[:f2]} has appeared #{fs[1].to_s} times, but " +
            "they haven't appeared together."
        } unless fs[0] <= 0 || fs[1] <= 0
      end
    end
  )

  @cond = DataNode.new(
    db, agg_db,
    Proc.new { |x| x.type == :if },
    key.merge({
      :norm_code => Proc.new { |x| normalize_nodes(x) },
      :cond => Proc.new { |x| normal_node(x) { |n| Unparser.unparse(n.children.first) }},
      :iftrue => Proc.new { |x| normal_node(x) { |n| Unparser.unparse(n.children[1]) }},
      :iffalse => Proc.new { |x| normal_node(x) { |n| Unparser.unparse(n.children[2]) }},
    }),
    data_core,
    combine
  )

  @ident = DataNode.new(
    db, agg_db,
    Proc.new { |x| [:lvasgn, :ivasgn, :cvasgn, :gvasgn].include?(x.type) },
    key.merge({
      :type => Proc.new { "ident" },
      :ident => Proc.new { |x| x.children.first.to_s },
    }),
    data_core.merge({
      :ident_type => Proc.new { |x| type.call(x.children[1]) rescue nil },
      :info => Proc.new { 0 },
      :func_info => Proc.new { 0 }
    }),
    combine.merge({
      :ident_types => Proc.new { |v| v.group_by { |y| y[:ident_type] }.map_hash { |x| x.size } }
    }),
    Proc.new { |db, keys, data|
      query = db.where(keys).first
      if query
        types = query.ident_types.select { |k,v| ["str","int","float","array","hash"].include? k }
        types.default = 0
        pp types
        first, second = types.sort_by{ |k,v| v*-1 }.take(2)
        if first[1] > 10 * (second[1] + 1)
          { :keys => keys,
            :message => 
              "The identifier #{keys[:ident]} has appeared #{first[1].to_s} " +
              "times as #{first[0].to_s}, but only #{types[data[:ident_type]].to_s} " +
              "times as #{data[:ident_type].to_s}" 
          } unless first[0].to_s == data[:ident_type]
        end
      end
    }
  )
end

Instance Attribute Details

#block ⇒ Object

Returns the value of attribute block.



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# File 'lib/codex.rb', line 5

def block
  @block
end

#cond ⇒ Object

Returns the value of attribute cond.



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# File 'lib/codex.rb', line 5

def cond
  @cond
end

#func ⇒ Object

Returns the value of attribute func.



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# File 'lib/codex.rb', line 5

def func
  @func
end

#func_chain ⇒ Object

Returns the value of attribute func_chain.



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# File 'lib/codex.rb', line 5

def func_chain
  @func_chain
end

#ident ⇒ Object

Returns the value of attribute ident.



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# File 'lib/codex.rb', line 5

def ident
  @ident
end

Instance Method Details

#normal_node(node) {|norm.rewrite_ast(node), norm| ... } ⇒ Object

Yields:

  • (norm.rewrite_ast(node), norm) 


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# File 'lib/codex.rb', line 201

def normal_node(node)
  norm = ASTNormalizer.new
  yield norm.rewrite_ast(node), norm
end

#normalize_nodes(nodes) ⇒ Object 



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# File 'lib/codex.rb', line 206

def normalize_nodes(nodes)
  normal_node(nodes) do |n|
    Unparser.unparse(n) rescue nil
  end
end

#without_caller(node) ⇒ Object 



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# File 'lib/codex.rb', line 195

def without_caller(node) 
  node.updated(nil, node.children.map.with_index do |x,i|
    i == 0 ? nil : x
  end)
end