Class: RubyLexUtils

Inherits:
Object show all
Defined in:
lib/openc3/utilities/ruby_lex_utils.rb

Constant Summary collapse

BLANK_LINE_REGEX =

Regular expression to detect blank lines

/^\s*$/
LONELY_ELSE_REGEX =

Regular expression to detect lines containing only ‘else’

/^\s*else\s*$/
KEY_KEYWORDS = 
[
  'class'.freeze,
  'module'.freeze,
  'def'.freeze,
  'undef'.freeze,
  'begin'.freeze,
  'rescue'.freeze,
  'ensure'.freeze,
  'end'.freeze,
  'if'.freeze,
  'unless'.freeze,
  'then'.freeze,
  'elsif'.freeze,
  'else'.freeze,
  'case'.freeze,
  'when'.freeze,
  'while'.freeze,
  'until'.freeze,
  'for'.freeze,
  'break'.freeze,
  'next'.freeze,
  'redo'.freeze,
  'retry'.freeze,
  'in'.freeze,
  'do'.freeze,
  'return'.freeze,
  'alias'.freeze
]

Instance Method Summary collapse

Constructor Details

#initialize ⇒ RubyLexUtils

Create a new RubyLex and StringIO to hold the text to operate on



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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 82

def initialize
  @lex    = RubyLex.new
  @lex_io = StringIO.new('')
end

Instance Method Details

#contains_begin?(text) ⇒ Boolean

Returns Whether the text contains the ‘begin’ keyword.

Parameters:

Returns:

  • (Boolean) —

    Whether the text contains the 'begin' keyword



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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 99

def contains_begin?(text)
  @lex.reinitialize
  @lex_io.string = text
  @lex.set_input(@lex_io)
  tokens = ripper_lex_without_warning(text)
  tokens.each do |token|
    if token[1] == :on_kw and token[2] == 'begin'
      return true
    end
  end
  return false
end

#contains_block_beginning?(text) ⇒ Boolean

Returns Whether the text contains a keyword which starts a block. i.e. ‘do’, ‘{’, or ‘begin’.

Parameters:

Returns:

  • (Boolean) —

    Whether the text contains a keyword which starts a block. i.e. 'do', '{', or 'begin'



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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 149

def contains_block_beginning?(text)
  @lex.reinitialize
  @lex_io.string = text
  @lex.set_input(@lex_io)
  tokens = ripper_lex_without_warning(text)
  tokens.each do |token|
    if token[1] == :on_kw
      if token[2] == 'begin' || token[2] == 'do'
        return true
      end
    elsif token[1] == :on_lbrace
      return true
    end
  end
  return false
end

#contains_end?(text) ⇒ Boolean

Returns Whether the text contains the ‘end’ keyword.

Parameters:

Returns:

  • (Boolean) —

    Whether the text contains the 'end' keyword



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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 114

def contains_end?(text)
  @lex.reinitialize
  @lex_io.string = text
  @lex.set_input(@lex_io)
  tokens = ripper_lex_without_warning(text)
  tokens.each do |token|
    if token[1] == :on_kw and token[2] == 'end'
      return true
    end
  end
  return false
end

#contains_keyword?(text) ⇒ Boolean

Returns Whether the text contains a Ruby keyword.

Parameters:

Returns:

  • (Boolean) —

    Whether the text contains a Ruby keyword



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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 129

def contains_keyword?(text)
  @lex.reinitialize
  @lex_io.string = text
  @lex.set_input(@lex_io)
  tokens = ripper_lex_without_warning(text)
  tokens.each do |token|
    if token[1] == :on_kw
      if KEY_KEYWORDS.include?(token[2])
        return true
      end
    elsif token[1] == :on_lbrace and !token[3].allbits?(Ripper::EXPR_BEG | Ripper::EXPR_LABEL)
      return true
    end
  end
  return false
end

#continue_block?(text) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 166

def continue_block?(text)
  @lex.reinitialize
  @lex_io.string = text
  @lex.set_input(@lex_io)
  tokens = RubyLex.ripper_lex_without_warning(text)
  index = tokens.length - 1
  while index > 0
    token = tokens[index]
    return true if token[1] == :on_kw and token[2] == "do"
    index -= 1
  end
  return false
end

#each_lexed_segment(text) {|line, instrumentable, inside_begin, line_no| ... } ⇒ Object

Yields each lexed segment and if the segment is instrumentable

Parameters:

Yield Parameters:

  • line (String) —

    The entire line

  • instrumentable (Boolean) —

    Whether the line is instrumentable

  • inside_begin (Integer) —

    The level of indentation

  • line_no (Integer) —

    The current line number



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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 217

def each_lexed_segment(text)
  inside_begin = false
  lex = RubyLex.new
  lex_io = StringIO.new(text)
  lex.set_input(lex_io)
  lex.line = ''
  line = ''
  continue_indent = nil
  begin_indent = nil
  previous_indent = 0

  while lexed = lex.lex
    #puts "lexed = #{lexed.chomp}, indent = #{lex.indent}, continue = #{lex.continue}"
    lex.line_no += lexed.count("\n")
    lex.line.concat lexed
    line.concat lexed
    if lex.continue
      if not continue_block?(lexed)
        unless continue_indent
          if (lex.indent - previous_indent) > 1
            continue_indent = lex.indent - 1
          else
            continue_indent = previous_indent
          end
        end
        #puts "continue_indent = #{continue_indent}"
        next
      end
    elsif continue_indent
      if lex.indent > continue_indent
        next
      else
        yield line, !contains_keyword?(line), inside_begin, lex.exp_line_no
        line = ''
        lex.exp_line_no = lex.line_no
        if lex.indent == 0
          lex.line = ''
        end
        next
      end
    end
    previous_indent = lex.indent
    continue_indent = nil

    # Detect the beginning and end of begin blocks so we can not catch exceptions there
    if contains_begin?(line)
      if contains_end?(line)
        # Assume the user is being fancy with a single line begin; end;
        # Ignore
      else
        inside_begin = true
        begin_indent = lex.indent unless begin_indent # Don't restart for nested begins
      end
    end

    if inside_begin and lex.indent < begin_indent
      begin_indent = nil
      inside_begin = false
    end

    loop do # loop to allow restarting for nested conditions
      # Yield blank lines and lonely else lines before the actual line
      while (index = line.index("\n"))
        one_line = line[0..index]
        if BLANK_LINE_REGEX.match?(one_line)
          yield one_line, true, inside_begin, lex.exp_line_no
          lex.exp_line_no += 1
          line = line[(index + 1)..-1]
        elsif LONELY_ELSE_REGEX.match?(one_line)
          yield one_line, false, inside_begin, lex.exp_line_no
          lex.exp_line_no += 1
          line = line[(index + 1)..-1]
        else
          break
        end
      end

      if contains_keyword?(line)
        if contains_block_beginning?(line)
          section = ''
          line.each_line do |lexed_part|
            section << lexed_part
            if contains_block_beginning?(section)
              yield section, false, inside_begin, lex.exp_line_no
              break
            end
            lex.exp_line_no += 1
          end
          lex.exp_line_no += 1
          remainder = line[(section.length)..-1]
          line = remainder
          next unless remainder.empty?
        else
          yield line, false, inside_begin, lex.exp_line_no
        end
      elsif !line.empty?
        num_left_brackets  = line.count('{')
        num_right_brackets = line.count('}')
        if num_left_brackets != num_right_brackets
          # Don't instrument lines with unequal numbers of { and } brackets
          yield line, false, inside_begin, lex.exp_line_no
        else
          yield line, true, inside_begin, lex.exp_line_no
        end
      end
      line = ''
      lex.exp_line_no = lex.line_no
      break
    end # loop do

    if lex.indent == 0
      lex.line = ''
    end
  end # while lexed
end

#remove_comments(text, progress_dialog = nil) ⇒ String

Returns The text with all comments removed.

Parameters:

  • text (String)
  • progress_dialog (OpenC3::ProgressDialog) (defaults to: nil) —

    If this is set, the overall progress will be set as the processing progresses

Returns:

  • (String) —

    The text with all comments removed



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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 184

def remove_comments(text, progress_dialog = nil)
  @lex.reinitialize
  @lex_io.string = text
  @lex.set_input(@lex_io)
  comments_removed = ""
  token_count = 0
  progress = 0.0
  tokens = ripper_lex_without_warning(text)
  tokens.each do |token|
    token_count += 1
    if token[1] != :on_comment
      comments_removed << token[2]
    else
      newline_count = token[2].count("\n")
      comments_removed << ("\n" * newline_count)
    end
    if progress_dialog and token_count % 10000 == 0
      progress += 0.01
      progress = 0.0 if progress >= 0.99
      progress_dialog.set_overall_progress(progress)
    end
  end

  return comments_removed
end

#ripper_lex_without_warning(code) ⇒ Object 



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# File 'lib/openc3/utilities/ruby_lex_utils.rb', line 88

def ripper_lex_without_warning(code)
  RubyLex.ripper_lex_without_warning(code)
end