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Diffstat (limited to 'lib/irb/ruby-lex.rb')
| -rw-r--r-- | lib/irb/ruby-lex.rb | 333 |
1 files changed, 0 insertions, 333 deletions
diff --git a/lib/irb/ruby-lex.rb b/lib/irb/ruby-lex.rb deleted file mode 100644 index 5e8f3235d6..0000000000 --- a/lib/irb/ruby-lex.rb +++ /dev/null @@ -1,333 +0,0 @@ -# frozen_string_literal: false -# -# irb/ruby-lex.rb - ruby lexcal analyzer -# $Release Version: 0.9.6$ -# $Revision$ -# by Keiju ISHITSUKA(keiju@ruby-lang.org) -# -# -- -# -# -# - -require "e2mmap" -require "ripper" - -# :stopdoc: -class RubyLex - - extend Exception2MessageMapper - def_exception(:TerminateLineInput, "Terminate Line Input") - - def initialize - @exp_line_no = @line_no = 1 - @indent = 0 - @continue = false - @line = "" - @prompt = nil - end - - # io functions - 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") - @tokens = Ripper.lex(code) - continue = process_continue - code_block_open = check_code_block(code) - indent = process_nesting_level - ltype = process_literal_type - if code_block_open or ltype or continue or indent > 0 - false - else - true - end - end - end - if p.respond_to?(:call) - @input = p - elsif block_given? - @input = block - else - @input = Proc.new{@io.gets} - end - end - - 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 - - def prompt - if @prompt - @prompt.call(@ltype, @indent, @continue, @line_no) - end - end - - def initialize_input - @ltype = nil - @indent = 0 - @continue = false - @line = "" - @exp_line_no = @line_no - @code_block_open = false - end - - 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 += 1 - 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 - - 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(code) - @continue = process_continue - @code_block_open = check_code_block(code) - @indent = process_nesting_level - @ltype = process_literal_type - line - end - - def process_continue - continued_bits = Ripper::EXPR_BEG | Ripper::EXPR_FNAME - # 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 (@tokens[-2][2] == 'begin' or @tokens[-2][2] == 'else') - return false - elsif @tokens.size >= 3 and @tokens[-3][1] == :on_symbeg and @tokens[-2][1] == :on_ivar - # This is for :@a or :@1 because :@1 ends with EXPR_FNAME - return false - elsif @tokens.size >= 2 and @tokens[-2][1] == :on_ivar and @tokens[-2][2] =~ /\A@\d+\z/ - # This is for @1 - return false - elsif @tokens.size >= 2 and @tokens[-2][1] == :on_cvar and @tokens[-1][1] == :on_int - # This is for @@1 or :@@1 and ends with on_int because it's syntax error - 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 @tokens[-2][3].anybits?(continued_bits) - # end of literal except for regexp - return true - end - false - end - - 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 - RubyVM::InstructionSequence.compile(code) - 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 - when /numbered parameter outside block/ - # "numbered parameter outside block" - # - # example: - # :@1 - return false - end - ensure - $VERBOSE = verbose - end - - 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 - - false - end - - def process_nesting_level - @tokens.inject(0) { |indent, t| - case t[1] - when :on_lbracket, :on_lbrace, :on_lparen - indent += 1 - when :on_rbracket, :on_rbrace, :on_rparen - indent -= 1 - when :on_kw - case t[2] - when 'def', 'do', 'case', 'for', 'begin', 'class', 'module' - indent += 1 - when 'if', 'unless', 'while', 'until', 'rescue' - # 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 - - 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 - - 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 -end -# :startdoc: |