Class: Dorian::Eval

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

Defined Under Namespace

Classes: Return

Constant Summary collapse

COLORS = 
{ red: "\e[31m", green: "\e[32m", reset: "\e[0m" }.freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(ruby: nil, it: nil, debug: false, stdout: true, stderr: true, colorize: false, rails: false, returns: false, fast: false) ⇒ Eval

Returns a new instance of Eval.



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# File 'lib/dorian/eval.rb', line 26

def initialize(
  ruby: nil,
  it: nil,
  debug: false,
  stdout: true,
  stderr: true,
  colorize: false,
  rails: false,
  returns: false,
  fast: false
)
  @ruby = ruby.to_s.empty? ? "nil" : ruby
  @it = it.to_s.empty? ? nil : it
  @debug = !!debug
  @stdout = !!stdout
  @stderr = !!stderr
  @colorize = !!colorize
  @rails = !!rails
  @returns = !!returns
  @fast = !!fast
end

Instance Attribute Details

#colorize ⇒ Object (readonly)

Returns the value of attribute colorize.



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# File 'lib/dorian/eval.rb', line 14

def colorize
  @colorize
end

#debug ⇒ Object (readonly)

Returns the value of attribute debug.



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# File 'lib/dorian/eval.rb', line 14

def debug
  @debug
end

#fast ⇒ Object (readonly)

Returns the value of attribute fast.



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# File 'lib/dorian/eval.rb', line 14

def fast
  @fast
end

#it ⇒ Object (readonly)

Returns the value of attribute it.



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# File 'lib/dorian/eval.rb', line 14

def it
  @it
end

#rails ⇒ Object (readonly)

Returns the value of attribute rails.



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# File 'lib/dorian/eval.rb', line 14

def rails
  @rails
end

#returns ⇒ Object (readonly)

Returns the value of attribute returns.



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# File 'lib/dorian/eval.rb', line 14

def returns
  @returns
end

#ruby ⇒ Object (readonly)

Returns the value of attribute ruby.



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# File 'lib/dorian/eval.rb', line 14

def ruby
  @ruby
end

#stderr ⇒ Object (readonly)

Returns the value of attribute stderr.



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# File 'lib/dorian/eval.rb', line 14

def stderr
  @stderr
end

#stdout ⇒ Object (readonly)

Returns the value of attribute stdout.



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# File 'lib/dorian/eval.rb', line 14

def stdout
  @stdout
end

Class Method Details

.eval ⇒ Object 



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# File 'lib/dorian/eval.rb', line 48

def self.eval(...)
  new(...).eval
end

Instance Method Details

#colorize? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dorian/eval.rb', line 119

def colorize?
  !!colorize
end

#colorize_string(string, color) ⇒ Object 



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# File 'lib/dorian/eval.rb', line 204

def colorize_string(string, color)
  return string unless color

  [COLORS.fetch(color), string, COLORS.fetch(:reset)].join
end

#debug? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dorian/eval.rb', line 107

def debug?
  !!debug
end

#eval ⇒ Object 



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# File 'lib/dorian/eval.rb', line 52

def eval
  fast? ? eval_fast : eval_slow
end

#eval_fast ⇒ Object 



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# File 'lib/dorian/eval.rb', line 56

def eval_fast
  Return.new(returned: Kernel.eval(full_ruby))
end

#eval_slow ⇒ Object 



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# File 'lib/dorian/eval.rb', line 60

def eval_slow
  read_out, write_out = IO.pipe
  read_err, write_err = IO.pipe

  spawn(write_out: write_out, write_err: write_err)

  write_out.close
  write_err.close

  out = ""
  err = ""

  thread_out =
    Thread.new do
      out +=
        gets(
          read_out,
          print: stdout?,
          method: :puts
        ).to_s until read_out.eof?
    end

  thread_err =
    Thread.new do
      err +=
        gets(
          read_err,
          color: :red,
          print: stderr?,
          method: :warn
        ).to_s until read_err.eof?
    end

  thread_out.join
  thread_err.join

  if returns?
    Return.new(stdout: out, stderr: err, returned: YAML.safe_load(out))
  else
    Return.new(stdout: out, stderr: err)
  end
end

#fast? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dorian/eval.rb', line 103

def fast?
  !!fast
end

#full_ruby ⇒ Object 



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# File 'lib/dorian/eval.rb', line 156

def full_ruby
  full_ruby = "it = #{to_ruby(it)}\n"
  full_ruby +=
    if returns? && slow?
      <<~RUBY
        require "yaml"
        puts (#{ruby}).to_yaml
      RUBY
    else
      <<~RUBY
        #{ruby}
      RUBY
    end

  full_ruby = <<~RUBY if rails?
    require "#{Dir.pwd}/config/environment"
    #{full_ruby}
  RUBY

  full_ruby
end

#gets(read, color: nil, print: true, method: :puts) ⇒ Object 



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# File 'lib/dorian/eval.rb', line 188

def gets(read, color: nil, print: true, method: :puts)
  original_string = read.gets
  return unless original_string

  string = original_string.rstrip
  string = colorize_string(string, color) if colorize? && color

  if method == :puts && print
    puts [prefix, string].join
  elsif method == :warn && print
    warn [prefix, string].join
  end

  original_string
end

#prefix ⇒ Object 



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# File 'lib/dorian/eval.rb', line 131

def prefix
  debug? && !returns? && it ? "[#{it}] " : ""
end

#rails? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dorian/eval.rb', line 123

def rails?
  !!rails
end

#returns? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dorian/eval.rb', line 127

def returns?
  !!returns
end

#slow? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dorian/eval.rb', line 152

def slow?
  !fast?
end

#spawn(write_out:, write_err:) ⇒ Object 



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# File 'lib/dorian/eval.rb', line 178

def spawn(write_out:, write_err:)
  Process.spawn(
    RbConfig.ruby,
    "-e",
    full_ruby,
    out: write_out,
    err: write_err
  )
end

#stderr? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dorian/eval.rb', line 115

def stderr?
  !!stderr
end

#stdout? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dorian/eval.rb', line 111

def stdout?
  !!stdout
end

#to_ruby(ruby) ⇒ Object 



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# File 'lib/dorian/eval.rb', line 135

def to_ruby(ruby)
  case ruby
  when Struct
    keys = ruby.to_h.keys.map { |key| to_ruby(key) }
    values = ruby.to_h.values.map { |value| to_ruby(value) }
    "Struct.new(#{keys.join(", ")}).new(#{values.join(", ")})"
  when String, Symbol, NilClass, TrueClass, FalseClass, Float, Integer
    ruby.inspect
  when Array
    "[#{ruby.map { |element| to_ruby(element) }.join(", ")}]"
  when Hash
    "{#{ruby.map { |key, value| "#{to_ruby(key)} => #{to_ruby(value)}" }}}"
  else
    raise "#{ruby.class} not supported"
  end
end