Module: UnusedVarChecker

Defined in:
lib/jscop/unused_var_checker.rb

Class Method Summary collapse

Class Method Details

.check_unused_var(file) ⇒ Object 



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# File 'lib/jscop/unused_var_checker.rb', line 56

def self.check_unused_var(file)
  variable_instances = []
  var_instances_count_hash = {}
  lines_variables_hash = {}

  line_check = lambda { |line|
    /([\(][\w\W]+[\)])/ =~ line.content.to_s
    vars_match_data = Regexp.last_match

    vars_match_data = vars_match_data if !vars_match_data.nil?
    vars_match_data_str_arr = vars_match_data.to_s.split

    escapables = ['var', 'let', '', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9']

    vars_match_data_str_arr.collect { |var|
      /([\w\-]+)/ =~ var
      wanted = Regexp.last_match
      wanted = wanted.to_s
      lines_variables_hash[line.number] = wanted if wanted
      variable_instances << wanted if !escapables.include?(wanted)
    }

    commented_line = line.content.to_s.match?(%r{^\W+[\/\/]})

    detected_variable = match_variable(line.content.to_s) if !commented_line
    lines_variables_hash[line.number] = detected_variable if detected_variable
    variable_instances << detected_variable if detected_variable
  }

  file.lines.each(&line_check)

  variable_instances.map { |el|
    var_instances_count_hash[el] = var_instances_count_hash[el] ? var_instances_count_hash[el] += 1 : 1
  }

  create_variables_check_info(var_instances_count_hash, lines_variables_hash, file.filename)
end

.check_unused_var_res(error_bin, path) ⇒ Object 



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# File 'lib/jscop/unused_var_checker.rb', line 4

def self.check_unused_var_res(error_bin, path)
  unused_var = check_unused_var(path)
  unused_var.each { |line, _variabl| error_bin << line if !unused_var.empty? }

  error_bin
end

.create_variables_check_info(count_vs_var, lines_vs_var, filename) ⇒ Object

rubocop:enable Lint/UselessAssignment



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# File 'lib/jscop/unused_var_checker.rb', line 41

def self.create_variables_check_info(count_vs_var, lines_vs_var, filename)
  err_type = 'UNUSED_VAR_ERR'

  lines_with_unused_var = []

  count_vs_var.each { |var_a, counter|
    lines_vs_var.each { |line, var_b|
      lines_with_unused_var << line if counter == 1 && var_a == var_b
      raise_err(line, err_type, filename, var_b) if counter == 1 && var_a == var_b
    }
  }

  lines_with_unused_var
end

.extract_from_parentesis(expresn) ⇒ Object 



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# File 'lib/jscop/unused_var_checker.rb', line 17

def self.extract_from_parentesis(expresn)
  /([\(][\w\W]+[\)])/ =~ expresn
  vars_match_data = Regexp.last_match

  vars_match_data_str_arr = vars_match_data.to_s.split

  vars_match_data_str_arr.collect { |var|
    /([\w\-]+)/ =~ var
    wanted = Regexp.last_match
    wanted = wanted.to_s

    all_params << wanted.to_s if !wanted.empty?
  }
end

.match_variable(contents) ⇒ Object

rubocop:disable Lint/UselessAssignment



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# File 'lib/jscop/unused_var_checker.rb', line 34

def self.match_variable(contents)
  /(?<lhs>\w+)\s*=\s*(?<rhs>\w*\W*)/ =~ contents

  lhs
end