class Object

Pretty Inspect Gem

Public Instance Methods

pretty_inspect(max_level=999) click to toggle source

This gem extends Object::inspect to “pretty” inspect arrays and hashes.

Example: (copy this to irb)

require 'pretty_inspect'
require 'bigdecimal'
class X
  def initialize
    @y = BigDecimal(31.41592653589796,4)
    @f = false
    @t = true
    @g = 3.141592653589796
    @n = nil
  end
end
puts (['a','b',{1=>'a',2=>X.new},'c'].pretty_inspect)

Yields:

[
  "a",
  "b",
  {
    1=>"a",
    2=><X:47374925831780
      @f===false,
      @t===true,
      @g===3.141592653589796,
      @n===nil,
      @y=31.42
    >
  },
  "c"
]

# File lib/pretty_inspect.rb, line 41
def pretty_inspect(max_level=999)
  object_ids = []
  pretty_inspect_core("", self, 0, "", object_ids, max_level-1)
end

Private Instance Methods

pretty_inspect_core(name, values, level, output, object_ids, max_level) click to toggle source

# File lib/pretty_inspect.rb, line 48
def pretty_inspect_core(name, values, level, output, object_ids, max_level)
    case values
      when Array
        output << "[\n"
        if (level>>1) > max_level
          output << " "*(level+2)
          output << "et.al.\n"
        else
          count = values.size
          values.each do |value|
            output << " "*(level+2)
            if object_ids.index(value.object_id)
              output << "[%s ...]"%name
            else
              object_ids.push(value.object_id)
              pretty_inspect_core(name, value,level+2,output,object_ids, max_level-1)
              object_ids.pop
            end
            output << (if (count -= 1) > 0 then ",\n" else "\n" end)
          end
        end
        output << " "*level
        output << "]"
      when Hash
        output << "{\n"
        if (level>>1) > max_level
          output << " "*(level+2)
          output << "et.al.\n"
        else
          count = values.size
          values.each do |key,value|
            output << "%s%s=>"%[" "*(level+2),key.inspect]
            if object_ids.index(value.object_id)
              output << "{@%s ...}"%key
            else
              object_ids.push(value.object_id)
              pretty_inspect_core(key, value,level+2,output,object_ids, max_level-1)
              object_ids.pop
            end
            output << (if (count -= 1) > 0 then ",\n" else "\n" end)
          end
        end
        output << " "*level
        output << "}"
      else
        count = values.instance_variables.count
        if count==0
          output << values.inspect
        else
          output << "<%s:%d\n"%[values.class.name,values.object_id]
          if (level>>1) > max_level
            output << " "*(level+2)
            output << "et.al.\n"
          else
            values.instance_variables.each do |item|
              value = values.instance_variable_get(item)
              output << " "*(level+2)
              case
                when defined?(BigDecimal) && value.class==BigDecimal
                  output << "%s=%s"%[item,value.to_s("F")]
                when [Complex,FalseClass,Float,Integer,NilClass,Regexp,String,TrueClass].index(value.class)
                  output << "%s=%s"%[item,value.inspect]
                else
                  output << "%s="%item
                  if object_ids.index(value.object_id)
                    output << "<%s ...>"%item
                  else
                    object_ids.push(value.object_id)
                    pretty_inspect_core(item,value,level+2,output,object_ids, max_level-1)
                    object_ids.pop
                  end
              end
              output << (if (count -= 1) > 0 then ",\n" else "\n" end)
            end
          end
        output << " "*level
        output << ">"
        end
    end
end