Class: Flog

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

Constant Summary collapse

VERSION =

:nodoc:

"4.7.0"
DEFAULT_THRESHOLD =

Cut off point where the report should stop unless –all given.

0.60
THRESHOLD =

:nodoc:

DEFAULT_THRESHOLD
SCORES =

The scoring system hash. Maps node type to score.

Hash.new 1
BRANCHING =

Names of nodes that branch.

[ :and, :case, :else, :if, :or, :rescue, :until, :when, :while ]
OTHER_SCORES =

Various non-call constructs

{
  :alias          => 2,
  :assignment     => 1,
  :block          => 1,
  :block_pass     => 1,
  :block_call     => 1,
  :branch         => 1,
  :magic_number   => 0.25,
  :sclass         => 5,
  :super          => 1,
  :to_proc_icky!  => 10,
  :to_proc_lasgn  => 15,
  :yield          => 1,
}
Rational =

1.8 / 1.9

Integer

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(option = {}) ⇒ Flog

Creates a new Flog instance with options.



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# File 'lib/flog.rb', line 226

def initialize option = {}
  super()
  @option              = option
  @mass                = {}
  @parser              = nil
  @threshold           = option[:threshold] || DEFAULT_THRESHOLD
  self.auto_shift_type = true
  self.reset
end

Instance Attribute Details

#calls ⇒ Object (readonly)

Returns the value of attribute calls.



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# File 'lib/flog.rb', line 91

def calls
  @calls
end

#mass ⇒ Object (readonly)

Returns the value of attribute mass.



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# File 'lib/flog.rb', line 91

def mass
  @mass
end

#method_scores ⇒ Object (readonly)

Returns the value of attribute method_scores.



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# File 'lib/flog.rb', line 92

def method_scores
  @method_scores
end

#multiplier ⇒ Object

:stopdoc:



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# File 'lib/flog.rb', line 90

def multiplier
  @multiplier
end

#option ⇒ Object (readonly)

Returns the value of attribute option.



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# File 'lib/flog.rb', line 91

def option
  @option
end

#scores ⇒ Object (readonly)

Returns the value of attribute scores.



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# File 'lib/flog.rb', line 92

def scores
  @scores
end

#threshold ⇒ Object

Final threshold that is used for report



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# File 'lib/flog.rb', line 292

def threshold
  option[:all] ? nil : total_score * @threshold
end

#total_score ⇒ Object (readonly)

Returns the value of attribute total_score.



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# File 'lib/flog.rb', line 93

def total_score
  @total_score
end

#totals ⇒ Object (readonly)

Returns the value of attribute totals.



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# File 'lib/flog.rb', line 93

def totals
  @totals
end

Instance Method Details

#add_to_score(name, score = ) ⇒ Object

Add a score to the tally. Score can be predetermined or looked up automatically. Uses multiplier for additional spankings. Spankings!



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# File 'lib/flog.rb', line 103

def add_to_score name, score = OTHER_SCORES[name]
  return if option[:methods] and method_stack.empty?
  @calls[signature][name] += score * @multiplier
end

#alias_method ⇒ Object

Various “magic” usually used for “clever code”



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# File 'lib/flog.rb', line 63

SCORES.merge!(:alias_method               => 2,
:extend                     => 2,
:include                    => 2,
:instance_method            => 2,
:instance_methods           => 2,
:method_added               => 2,
:method_defined?            => 2,
:method_removed             => 2,
:method_undefined           => 2,
:private_class_method       => 2,
:private_instance_methods   => 2,
:private_method_defined?    => 2,
:protected_instance_methods => 2,
:protected_method_defined?  => 2,
:public_class_method        => 2,
:public_instance_methods    => 2,
:public_method_defined?     => 2,
:remove_method              => 2,
:send                       => 3,
:undef_method               => 2)

#average ⇒ Object

really?



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# File 'lib/flog.rb', line 111

def average
  return 0 if calls.size == 0
  total_score / calls.size
end

#calculate ⇒ Object

Calculates classes and methods scores.



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# File 'lib/flog.rb', line 119

def calculate
  each_by_score threshold do |class_method, score, call_list|
    klass = class_method.scan(/.+(?=#|::)/).first

    method_scores[klass] << [class_method, score]
    scores[klass] += score
  end
end

#calculate_total_scores ⇒ Object

Calculates the total score and populates @totals.



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# File 'lib/flog.rb', line 299

def calculate_total_scores
  return if @totals

  @total_score = 0
  @totals = Hash.new(0)

  calls.each do |meth, tally|
    score = score_method(tally)

    @totals[meth] = score
    @total_score += score
  end
end

#define_method ⇒ Object

Eval forms



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# File 'lib/flog.rb', line 54

SCORES.merge!(:define_method => 5,
:eval          => 5,
:module_eval   => 5,
:class_eval    => 5,
:instance_eval => 5)

#dsl_name?(args) ⇒ Boolean

Returns true if the form looks like a “DSL” construct.

task :blah do ... end
=> s(:iter, s(:call, nil, :task, s(:lit, :blah)), ...)

Returns:

  • (Boolean) 


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# File 'lib/flog.rb', line 134

def dsl_name? args
  return false unless args and not args.empty?

  first_arg, = args
  first_arg = first_arg[1] if first_arg.sexp_type == :hash

  type, value, * = first_arg

  value if [:lit, :str].include? type
end

#each_by_score(max = nil) ⇒ Object

Iterate over the calls sorted (descending) by score.



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# File 'lib/flog.rb', line 148

def each_by_score max = nil
  current = 0

  calls.sort_by { |k,v| -totals[k] }.each do |class_method, call_list|
    score = totals[class_method]

    yield class_method, score, call_list

    current += score
    break if max and current >= max
  end
end

#flog(*files) ⇒ Object

Flog the given files. Deals with “-”, and syntax errors.

Not as smart as FlogCLI’s #flog method as it doesn’t traverse dirs. Use PathExpander to expand dirs into files.



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# File 'lib/flog.rb', line 167

def flog(*files)
  files.each do |file|
    next unless file == "-" or File.readable? file

    ruby = file == "-" ? $stdin.read : File.binread(file)

    flog_ruby ruby, file
  end

  calculate_total_scores
end

#flog_ruby(ruby, file = "-", timeout = 10) ⇒ Object

Flog the given ruby source, optionally using file to provide paths for methods. Smart. Handles syntax errors and timeouts so you don’t have to.



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# File 'lib/flog.rb', line 184

def flog_ruby ruby, file="-", timeout = 10
  flog_ruby! ruby, file, timeout
rescue Timeout::Error
  warn "TIMEOUT parsing #{file}. Skipping."
rescue RubyParser::SyntaxError, Racc::ParseError => e
  q = option[:quiet]
  if e.inspect =~ /<\%|%\>/ or ruby =~ /<\%|%\>/ then
    return if q
    warn "#{e.inspect} at #{e.backtrace.first(5).join(", ")}"
    warn "\n...stupid lemmings and their bad erb templates... skipping"
  else
    warn "ERROR: parsing ruby file #{file}" unless q
    unless option[:continue] then
      warn "ERROR! Aborting. You may want to run with --continue."
      raise e
    end
    return if q
    warn "%s: %s at:\n  %s" % [e.class, e.message.strip,
                               e.backtrace.first(5).join("\n  ")]
  end
end

#flog_ruby!(ruby, file = "-", timeout = 10) ⇒ Object

Flog the given ruby source, optionally using file to provide paths for methods. Does not handle timeouts or syntax errors. See #flog_ruby.



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# File 'lib/flog.rb', line 210

def flog_ruby! ruby, file="-", timeout = 10
  @parser = (option[:parser] || RubyParser).new

  warn "** flogging #{file}" if option[:verbose]

  ast = @parser.process ruby, file, timeout

  return unless ast

  mass[file] = ast.mass
  process ast
end

#inject ⇒ Object

Calls that are ALMOST ALWAYS ABUSED!



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# File 'lib/flog.rb', line 87

SCORES.merge!(:inject => 2)

#max_method ⇒ Object

Returns the method/score pair of the maximum score.



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# File 'lib/flog.rb', line 239

def max_method
  totals.max_by { |_, score| score }
end

#max_score ⇒ Object

Returns the maximum score for a single method. Used for FlogTask.



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# File 'lib/flog.rb', line 246

def max_score
  max_method.last
end

#no_method ⇒ Object

:nodoc:



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# File 'lib/flog.rb', line 313

def no_method # :nodoc:
  @@no_method
end

#penalize_by(bonus) ⇒ Object

For the duration of the block the complexity factor is increased by #bonus This allows the complexity of sub-expressions to be influenced by the expressions in which they are found. Yields 42 to the supplied block.



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# File 'lib/flog.rb', line 256

def penalize_by bonus
  @multiplier += bonus
  yield
  @multiplier -= bonus
end

#process_alias(exp) ⇒ Object

:stopdoc:



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# File 'lib/flog.rb', line 321

def process_alias(exp)
  process exp.shift
  process exp.shift
  add_to_score :alias
  s()
end

#process_and(exp) ⇒ Object Also known as: process_or 



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# File 'lib/flog.rb', line 328

def process_and(exp)
  add_to_score :branch
  penalize_by 0.1 do
    process exp.shift # lhs
    process exp.shift # rhs
  end
  s()
end

#process_attrasgn(exp) ⇒ Object 



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# File 'lib/flog.rb', line 338

def process_attrasgn(exp)
  add_to_score :assignment
  process exp.shift # lhs
  exp.shift # name
  process_until_empty exp # rhs
  s()
end

#process_block(exp) ⇒ Object 



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# File 'lib/flog.rb', line 346

def process_block(exp)
  penalize_by 0.1 do
    process_until_empty exp
  end
  s()
end

#process_block_pass(exp) ⇒ Object 



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# File 'lib/flog.rb', line 353

def process_block_pass(exp)
  arg = exp.shift

  add_to_score :block_pass

  return s() unless arg

  case arg.sexp_type
  when :lvar, :dvar, :ivar, :cvar, :self, :const, :colon2, :nil then # f(&b)
    # do nothing
  when :lit then                                                     # f(&:b)
    # do nothing -- this now costs about the same as a block
  when :call then                                                    # f(&x.b)
    # do nothing -- I don't like the indirection, but that's already scored
  when :lasgn then                                                   # f(&l=b)
    add_to_score :to_proc_lasgn
  when :iter, :dsym, :dstr, :hash, *BRANCHING then                   # below
    # f(&proc { ... })
    # f(&"#{...}")
    # f(&:"#{...}")
    # f(&if ... then ... end") and all other branching forms
    # f(&{ a: 42 })  WHY?!?
    add_to_score :to_proc_icky!
  else
    raise({:block_pass_even_ickier! => arg}.inspect)
  end

  process arg

  s()
end

#process_call(exp) ⇒ Object 



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# File 'lib/flog.rb', line 385

def process_call(exp)
  penalize_by 0.2 do
    process exp.shift # recv
  end

  name = exp.shift

  penalize_by 0.2 do
    process_until_empty exp
  end

  add_to_score name, SCORES[name]

  s()
end

#process_case(exp) ⇒ Object 



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# File 'lib/flog.rb', line 417

def process_case(exp)
  add_to_score :branch
  process exp.shift # recv
  penalize_by 0.1 do
    process_until_empty exp
  end
  s()
end

#process_class(exp) ⇒ Object 



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# File 'lib/flog.rb', line 426

def process_class(exp)
  super do
    penalize_by 1.0 do
      process exp.shift # superclass expression
    end
    process_until_empty exp
  end
end

#process_dasgn_curr(exp) ⇒ Object Also known as: process_iasgn, process_lasgn

FIX: remove



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# File 'lib/flog.rb', line 435

def process_dasgn_curr(exp) # FIX: remove
  add_to_score :assignment
  exp.shift # name
  process exp.shift # assigment, if any
  s()
end

#process_else(exp) ⇒ Object Also known as: process_rescue, process_when

TODO: it’s not clear to me whether this can be generated at all.



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# File 'lib/flog.rb', line 445

def process_else(exp)
  add_to_score :branch
  penalize_by 0.1 do
    process_until_empty exp
  end
  s()
end

#process_if(exp) ⇒ Object 



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# File 'lib/flog.rb', line 455

def process_if(exp)
  add_to_score :branch
  process exp.shift # cond
  penalize_by 0.1 do
    process exp.shift # true
    process exp.shift # false
  end
  s()
end

#process_iter(exp) ⇒ Object 



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# File 'lib/flog.rb', line 465

def process_iter(exp)
  context = (self.context - [:class, :module, :scope])
  context = context.uniq.sort_by { |s| s.to_s }

  exp.delete 0 # { || ... } has 0 in arg slot

  if context == [:block, :iter] or context == [:iter] then
    recv, = exp

    # DSL w/ names. eg task :name do ... end
    #   looks like s(:call, nil, :task, s(:lit, :name))
    #           or s(:call, nil, :task, s(:str, "name"))
    #           or s(:call, nil, :task, s(:hash, s(:lit, :name) ...))

    t, r, m, *a = recv

    if t == :call and r == nil and submsg = dsl_name?(a) then
      m = "#{m}(#{submsg})" if m and [String, Symbol].include?(submsg.class)
      in_klass m do                             # :task/namespace
        in_method submsg, exp.file, exp.line, exp.line_max do # :name
          process_until_empty exp
        end
      end
      return s()
    end
  end

  add_to_score :block_call

  process exp.shift # no penalty for LHS

  penalize_by 0.1 do
    process_until_empty exp
  end

  s()
end

#process_lit(exp) ⇒ Object 



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# File 'lib/flog.rb', line 505

def process_lit(exp)
  value = exp.shift
  case value
  when 0, -1 then
    # ignore those because they're used as array indicies instead of
    # first/last
  when Integer, Float, Rational, Complex then
    add_to_score :magic_number unless context[1] == :cdecl
  when Symbol, Regexp, Range then
    # do nothing
  else
    raise "Unhandled lit: #{value.inspect}:#{value.class}"
  end
  s()
end

#process_masgn(exp) ⇒ Object 



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# File 'lib/flog.rb', line 521

def process_masgn(exp)
  add_to_score :assignment

  exp.map! { |s| Sexp === s ? s : s(:lasgn, s) }

  process_until_empty exp
  s()
end

#process_safe_call(exp) ⇒ Object 



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# File 'lib/flog.rb', line 401

def process_safe_call(exp)
  penalize_by 0.3 do
    process exp.shift # recv
  end

  name = exp.shift

  penalize_by 0.2 do
    process_until_empty exp
  end

  add_to_score name, SCORES[name]

  s()
end

#process_sclass(exp) ⇒ Object 



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# File 'lib/flog.rb', line 530

def process_sclass(exp)
  super do
    penalize_by 0.5 do
      process exp.shift # recv
      process_until_empty exp
    end
  end

  add_to_score :sclass
  s()
end

#process_super(exp) ⇒ Object 



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# File 'lib/flog.rb', line 542

def process_super(exp)
  add_to_score :super
  process_until_empty exp
  s()
end

#process_while(exp) ⇒ Object Also known as: process_until 



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# File 'lib/flog.rb', line 548

def process_while(exp)
  add_to_score :branch
  penalize_by 0.1 do
    process exp.shift # cond
    process exp.shift # body
  end
  exp.shift # pre/post
  s()
end

#process_yield(exp) ⇒ Object 



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# File 'lib/flog.rb', line 559

def process_yield(exp)
  add_to_score :yield
  process_until_empty exp
  s()
end

#reset ⇒ Object

Reset score data



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# File 'lib/flog.rb', line 265

def reset
  @totals           = @total_score = nil
  @multiplier       = 1.0
  @calls            = Hash.new { |h,k| h[k] = Hash.new 0 }
  @method_scores    = Hash.new { |h,k| h[k] = [] }
  @scores           = Hash.new 0
  method_locations.clear
end

#score_method(tally) ⇒ Object

Compute the distance formula for a given tally



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# File 'lib/flog.rb', line 277

def score_method(tally)
  a, b, c = 0, 0, 0
  tally.each do |cat, score|
    case cat
    when :assignment then a += score
    when :branch, :block_call then b += score
    else                  c += score
    end
  end
  Math.sqrt(a*a + b*b + c*c)
end