Class: Rubocop::Cop::Syntax

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/syntax.rb

Instance Attribute Summary

Attributes inherited from Cop

#correlations, #disabled_lines, #offences

Instance Method Summary collapse

Methods inherited from Cop

#add_offence, #has_report?, inherited, #initialize

Constructor Details

This class inherits a constructor from Rubocop::Cop::Cop

Instance Method Details

#inspect(file, source, tokens, sexp) ⇒ Object 



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# File 'lib/rubocop/cop/syntax.rb', line 8

def inspect(file, source, tokens, sexp)
  stderr = nil

  # it's extremely important to run the syntax check in a
  # clean environment - otherwise it will be extremely slow
  if defined? Bundler
    Bundler.with_clean_env do
      _, stderr, _ =
        Open3.capture3('ruby -wc', stdin_data: source.join("\n"))
    end
  else
    _, stderr, _ =
      Open3.capture3('ruby -wc', stdin_data: source.join("\n"))
  end

  stderr.each_line do |line|
    # discard lines that are not containing relevant info
    if line =~ /.+:(\d+): (.+)/
      line_no, severity, message = process_line(line)
      add_offence(severity, line_no, message)
    end
  end
end

#process_line(line) ⇒ Object 



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# File 'lib/rubocop/cop/syntax.rb', line 32

def process_line(line)
  line_no, message = line.match(/.+:(\d+): (.+)/).captures
  if message.start_with?('warning: ')
    [line_no.to_i, :warning, message.sub(/warning: /, '').capitalize]
  else
    [line_no.to_i, :error, message.capitalize]
  end
end