Class: RubyLex

Inherits:
Object show all
Defined in:
lib/irb/ruby-lex.rb

Overview

:stopdoc:

Defined Under Namespace

Classes: TerminateLineInput

Instance Method Summary collapse

Constructor Details

#initialize ⇒ RubyLex

Returns a new instance of RubyLex.



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# File 'lib/irb/ruby-lex.rb', line 24

def initialize
  @exp_line_no = @line_no = 1
  @indent = 0
  @continue = false
  @line = ""
  @prompt = nil
end

Instance Method Details

#check_code_block(code) ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 200

def check_code_block(code)
  return true if @tokens.empty?
  if @tokens.last[1] == :on_heredoc_beg
    return true
  end

  begin # check if parser error are available
    verbose, $VERBOSE = $VERBOSE, nil
    case RUBY_ENGINE
    when 'jruby'
      JRuby.compile_ir(code)
    else
      RubyVM::InstructionSequence.compile(code)
    end
  rescue SyntaxError => e
    case e.message
    when /unterminated (?:string|regexp) meets end of file/
      # "unterminated regexp meets end of file"
      #
      #   example:
      #     /
      #
      # "unterminated string meets end of file"
      #
      #   example:
      #     '
      return true
    when /syntax error, unexpected end-of-input/
      # "syntax error, unexpected end-of-input, expecting keyword_end"
      #
      #   example:
      #     if ture
      #       hoge
      #       if false
      #         fuga
      #       end
      return true
    when /syntax error, unexpected keyword_end/
      # "syntax error, unexpected keyword_end"
      #
      #   example:
      #     if (
      #     end
      #
      #   example:
      #     end
      return false
    when /syntax error, unexpected '\.'/
      # "syntax error, unexpected '.'"
      #
      #   example:
      #     .
      return false
    when /unexpected tREGEXP_BEG/
      # "syntax error, unexpected tREGEXP_BEG, expecting keyword_do or '{' or '('"
      #
      #   example:
      #     method / f /
      return false
    end
  ensure
    $VERBOSE = verbose
  end

  if defined?(Ripper::EXPR_BEG)
    last_lex_state = @tokens.last[3]
    if last_lex_state.allbits?(Ripper::EXPR_BEG)
      return false
    elsif last_lex_state.allbits?(Ripper::EXPR_DOT)
      return true
    elsif last_lex_state.allbits?(Ripper::EXPR_CLASS)
      return true
    elsif last_lex_state.allbits?(Ripper::EXPR_FNAME)
      return true
    elsif last_lex_state.allbits?(Ripper::EXPR_VALUE)
      return true
    elsif last_lex_state.allbits?(Ripper::EXPR_ARG)
      return false
    end
  end

  false
end

#check_corresponding_token_depth ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 362

def check_corresponding_token_depth
  corresponding_token_depth = nil
  is_first_spaces_of_line = true
  is_first_printable_of_line = true
  spaces_of_nest = []
  spaces_at_line_head = 0
  @tokens.each_with_index do |t, index|
    case t[1]
    when :on_ignored_nl, :on_nl, :on_comment
      corresponding_token_depth = nil
      spaces_at_line_head = 0
      is_first_spaces_of_line = true
      is_first_printable_of_line = true
      next
    when :on_sp
      spaces_at_line_head = t[2].count(' ') if is_first_spaces_of_line
      is_first_spaces_of_line = false
      next
    end
    case t[1]
    when :on_lbracket, :on_lbrace, :on_lparen
      spaces_of_nest.push(spaces_at_line_head)
    when :on_rbracket, :on_rbrace, :on_rparen
      if is_first_printable_of_line
        corresponding_token_depth = spaces_of_nest.pop
      else
        spaces_of_nest.pop
        corresponding_token_depth = nil
      end
    when :on_kw
      next if index > 0 and @tokens[index - 1][3].allbits?(Ripper::EXPR_FNAME)
      case t[2]
      when 'def', 'do', 'case', 'for', 'begin', 'class', 'module'
        spaces_of_nest.push(spaces_at_line_head)
      when 'if', 'unless', 'while', 'until'
        # postfix if/unless/while/until/rescue must be Ripper::EXPR_LABEL
        unless t[3].allbits?(Ripper::EXPR_LABEL)
          spaces_of_nest.push(spaces_at_line_head)
        end
      when 'else', 'elsif', 'rescue', 'ensure', 'when', 'in'
        corresponding_token_depth = spaces_of_nest.last
      when 'end'
        if is_first_printable_of_line
          corresponding_token_depth = spaces_of_nest.pop
        else
          spaces_of_nest.pop
          corresponding_token_depth = nil
        end
      end
    end
    is_first_spaces_of_line = false
    is_first_printable_of_line = false
  end
  corresponding_token_depth
end

#check_newline_depth_difference ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 318

def check_newline_depth_difference
  depth_difference = 0
  @tokens.each_with_index do |t, index|
    case t[1]
    when :on_ignored_nl, :on_nl, :on_comment
      if index != (@tokens.size - 1)
        depth_difference = 0
      end
      next
    when :on_sp
      next
    end
    case t[1]
    when :on_lbracket, :on_lbrace, :on_lparen
      depth_difference += 1
    when :on_rbracket, :on_rbrace, :on_rparen
      depth_difference -= 1
    when :on_kw
      next if index > 0 and @tokens[index - 1][3].allbits?(Ripper::EXPR_FNAME)
      case t[2]
      when 'do'
        if index > 0 and @tokens[index - 1][3].anybits?(Ripper::EXPR_CMDARG | Ripper::EXPR_ENDFN | Ripper::EXPR_ARG)
          # method_with_block do; end
          depth_difference += 1
        else
          # while cond do; end # also "until" or "for"
          # This "do" doesn't increment indent because "while" already
          # incremented.
        end
      when 'def', 'case', 'for', 'begin', 'class', 'module'
        depth_difference += 1
      when 'if', 'unless', 'while', 'until'
        # postfix if/unless/while/until/rescue must be Ripper::EXPR_LABEL
        unless t[3].allbits?(Ripper::EXPR_LABEL)
          depth_difference += 1
        end
      when 'else', 'elsif', 'rescue', 'ensure', 'when', 'in'
        depth_difference += 1
      end
    end
  end
  depth_difference
end

#check_state(code) ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 108

def check_state(code)
  @tokens = ripper_lex_without_warning(code)
  ltype = process_literal_type
  indent = process_nesting_level
  continue = process_continue
  code_block_open = check_code_block(code)
  [ltype, indent, continue, code_block_open]
end

#check_string_literal ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 418

def check_string_literal
  i = 0
  start_token = []
  end_type = []
  while i < @tokens.size
    t = @tokens[i]
    case t[1]
    when :on_tstring_beg
      start_token << t
      end_type << [:on_tstring_end, :on_label_end]
    when :on_regexp_beg
      start_token << t
      end_type << :on_regexp_end
    when :on_symbeg
      acceptable_single_tokens = %i{on_ident on_const on_op on_cvar on_ivar on_gvar on_kw}
      if (i + 1) < @tokens.size and acceptable_single_tokens.all?{ |t| @tokens[i + 1][1] != t }
        start_token << t
        end_type << :on_tstring_end
      end
    when :on_backtick
      start_token << t
      end_type << :on_tstring_end
    when :on_qwords_beg, :on_words_beg, :on_qsymbols_beg, :on_symbols_beg
      start_token << t
      end_type << :on_tstring_end
    when :on_heredoc_beg
      start_token << t
      end_type << :on_heredoc_end
    when *end_type.last
      start_token.pop
      end_type.pop
    end
    i += 1
  end
  start_token.last.nil? ? '' : start_token.last
end

#each_top_level_statement ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 132

def each_top_level_statement
  initialize_input
  catch(:TERM_INPUT) do
    loop do
      begin
        prompt
        unless l = lex
          throw :TERM_INPUT if @line == ''
        else
          @line_no += l.count("\n")
          next if l == "\n"
          @line.concat l
          if @code_block_open or @ltype or @continue or @indent > 0
            next
          end
        end
        if @line != "\n"
          @line.force_encoding(@io.encoding)
          yield @line, @exp_line_no
        end
        break if @io.eof?
        @line = ''
        @exp_line_no = @line_no

        @indent = 0
      rescue TerminateLineInput
        initialize_input
        prompt
      end
    end
  end
end

#initialize_input ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 123

def initialize_input
  @ltype = nil
  @indent = 0
  @continue = false
  @line = ""
  @exp_line_no = @line_no
  @code_block_open = false
end

#lex ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 165

def lex
  line = @input.call
  if @io.respond_to?(:check_termination)
    return line # multiline
  end
  code = @line + (line.nil? ? '' : line)
  code.gsub!(/\s*\z/, '').concat("\n")
  @tokens = ripper_lex_without_warning(code)
  @continue = process_continue
  @code_block_open = check_code_block(code)
  @indent = process_nesting_level
  @ltype = process_literal_type
  line
end

#process_continue ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 180

def process_continue
  # last token is always newline
  if @tokens.size >= 2 and @tokens[-2][1] == :on_regexp_end
    # end of regexp literal
    return false
  elsif @tokens.size >= 2 and @tokens[-2][1] == :on_semicolon
    return false
  elsif @tokens.size >= 2 and @tokens[-2][1] == :on_kw and ['begin', 'else', 'ensure'].include?(@tokens[-2][2])
    return false
  elsif !@tokens.empty? and @tokens.last[2] == "\\\n"
    return true
  elsif @tokens.size >= 1 and @tokens[-1][1] == :on_heredoc_end # "EOH\n"
    return false
  elsif @tokens.size >= 2 and defined?(Ripper::EXPR_BEG) and @tokens[-2][3].anybits?(Ripper::EXPR_BEG | Ripper::EXPR_FNAME)
    # end of literal except for regexp
    return true
  end
  false
end

#process_literal_type ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 455

def process_literal_type
  start_token = check_string_literal
  case start_token[1]
  when :on_tstring_beg
    case start_token[2]
    when ?"      then ?"
    when /^%.$/  then ?"
    when /^%Q.$/ then ?"
    when ?'      then ?'
    when /^%q.$/ then ?'
    end
  when :on_regexp_beg   then ?/
  when :on_symbeg       then ?:
  when :on_backtick     then ?`
  when :on_qwords_beg   then ?]
  when :on_words_beg    then ?]
  when :on_qsymbols_beg then ?]
  when :on_symbols_beg  then ?]
  when :on_heredoc_beg
    start_token[2] =~ /<<[-~]?(['"`])[_a-zA-Z0-9]+\1/
    case $1
    when ?" then ?"
    when ?' then ?'
    when ?` then ?`
    else         ?"
    end
  else
    nil
  end
end

#process_nesting_level ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 284

def process_nesting_level
  indent = 0
  @tokens.each_with_index { |t, index|
    case t[1]
    when :on_lbracket, :on_lbrace, :on_lparen
      indent += 1
    when :on_rbracket, :on_rbrace, :on_rparen
      indent -= 1
    when :on_kw
      next if index > 0 and @tokens[index - 1][3].allbits?(Ripper::EXPR_FNAME)
      case t[2]
      when 'do'
        if index > 0 and @tokens[index - 1][3].anybits?(Ripper::EXPR_CMDARG | Ripper::EXPR_ENDFN | Ripper::EXPR_ARG)
          # method_with_block do; end
          indent += 1
        else
          # while cond do; end # also "until" or "for"
          # This "do" doesn't increment indent because "while" already
          # incremented.
        end
      when 'def', 'case', 'for', 'begin', 'class', 'module'
        indent += 1
      when 'if', 'unless', 'while', 'until'
        # postfix if/unless/while/until/rescue must be Ripper::EXPR_LABEL
        indent += 1 unless t[3].allbits?(Ripper::EXPR_LABEL)
      when 'end'
        indent -= 1
      end
    end
    # percent literals are not indented
  }
  indent
end

#prompt ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 117

def prompt
  if @prompt
    @prompt.call(@ltype, @indent, @continue, @line_no)
  end
end

#ripper_lex_without_warning(code) ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 76

def ripper_lex_without_warning(code)
  verbose, $VERBOSE = $VERBOSE, nil
  tokens = Ripper.lex(code)
  $VERBOSE = verbose
  tokens
end

#set_auto_indent(context) ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 83

def set_auto_indent(context)
  if @io.respond_to?(:auto_indent) and context.auto_indent_mode
    @io.auto_indent do |lines, line_index, byte_pointer, is_newline|
      if is_newline
        md = lines[line_index - 1].match(/(\A +)/)
        prev_spaces = md.nil? ? 0 : md[1].count(' ')
        @tokens = ripper_lex_without_warning(lines[0..line_index].join("\n"))
        depth_difference = check_newline_depth_difference
        prev_spaces + depth_difference * 2
      else
        code = line_index.zero? ? '' : lines[0..(line_index - 1)].map{ |l| l + "\n" }.join
        last_line = lines[line_index]&.byteslice(0, byte_pointer)
        code += last_line if last_line
        @tokens = ripper_lex_without_warning(code)
        corresponding_token_depth = check_corresponding_token_depth
        if corresponding_token_depth
          corresponding_token_depth
        else
          nil
        end
      end
    end
  end
end

#set_input(io, p = nil, &block) ⇒ Object

io functions



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# File 'lib/irb/ruby-lex.rb', line 33

def set_input(io, p = nil, &block)
  @io = io
  if @io.respond_to?(:check_termination)
    @io.check_termination do |code|
      code.gsub!(/\s*\z/, '').concat("\n")
      ltype, indent, continue, code_block_open = check_state(code)
      if ltype or indent > 0 or continue or code_block_open
        false
      else
        true
      end
    end
  end
  if @io.respond_to?(:dynamic_prompt)
    @io.dynamic_prompt do |lines|
      lines << '' if lines.empty?
      result = []
      lines.each_index { |i|
        c = lines[0..i].map{ |l| l + "\n" }.join
        ltype, indent, continue, code_block_open = check_state(c)
        result << @prompt.call(ltype, indent, continue || code_block_open, @line_no + i)
      }
      result
    end
  end
  if p.respond_to?(:call)
    @input = p
  elsif block_given?
    @input = block
  else
    @input = Proc.new{@io.gets}
  end
end

#set_prompt(p = nil, &block) ⇒ Object 



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# File 'lib/irb/ruby-lex.rb', line 67

def set_prompt(p = nil, &block)
  p = block if block_given?
  if p.respond_to?(:call)
    @prompt = p
  else
    @prompt = Proc.new{print p}
  end
end