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305 lines
7.4 KiB
Ruby
305 lines
7.4 KiB
Ruby
# frozen_string_literal: false
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#
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# irb/ruby-lex.rb - ruby lexcal analyzer
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# $Release Version: 0.9.6$
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# $Revision$
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# by Keiju ISHITSUKA(keiju@ruby-lang.org)
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#
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# --
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#
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#
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#
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require "e2mmap"
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require "ripper"
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# :stopdoc:
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class RubyLex
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extend Exception2MessageMapper
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def_exception(:TerminateLineInput, "Terminate Line Input")
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def initialize
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@exp_line_no = @line_no = 1
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@indent = 0
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@continue = false
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@line = ""
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@prompt = nil
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end
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# io functions
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def set_input(io, p = nil, &block)
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@io = io
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if @io.respond_to?(:check_termination)
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@io.check_termination do |code|
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@tokens = Ripper.lex(code)
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continue = process_continue
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code_block_open = check_code_block(code)
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indent = process_nesting_level
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ltype = process_literal_type
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if code_block_open or ltype or continue or indent > 0
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false
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else
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true
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end
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end
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end
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if p.respond_to?(:call)
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@input = p
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elsif block_given?
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@input = block
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else
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@input = Proc.new{@io.gets}
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end
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end
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def set_prompt(p = nil, &block)
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p = block if block_given?
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if p.respond_to?(:call)
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@prompt = p
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else
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@prompt = Proc.new{print p}
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end
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end
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def prompt
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if @prompt
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@prompt.call(@ltype, @indent, @continue, @line_no)
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end
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end
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def initialize_input
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@ltype = nil
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@indent = 0
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@continue = false
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@line = ""
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@exp_line_no = @line_no
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@code_block_open = false
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end
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def each_top_level_statement
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initialize_input
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catch(:TERM_INPUT) do
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loop do
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begin
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prompt
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unless l = lex
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throw :TERM_INPUT if @line == ''
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else
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@line_no += 1
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next if l == "\n"
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@line.concat l
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if @code_block_open or @ltype or @continue or @indent > 0
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next
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end
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end
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if @line != "\n"
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@line.force_encoding(@io.encoding)
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yield @line, @exp_line_no
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end
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break unless l
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@line = ''
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@exp_line_no = @line_no
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@indent = 0
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rescue TerminateLineInput
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initialize_input
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prompt
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end
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end
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end
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end
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def lex
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line = @input.call
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if @io.respond_to?(:check_termination)
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return line # multiline
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end
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code = @line + (line.nil? ? '' : line)
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code.gsub!(/\n*$/, '').concat("\n")
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@tokens = Ripper.lex(code)
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@continue = process_continue
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@code_block_open = check_code_block(code)
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@indent = process_nesting_level
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@ltype = process_literal_type
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line
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end
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def process_continue
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continued_bits = Ripper::EXPR_BEG | Ripper::EXPR_FNAME | Ripper::EXPR_DOT
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# last token is always newline
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if @tokens.size >= 2 and @tokens[-2][1] == :on_regexp_end
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# end of regexp literal
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return false
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elsif @tokens.size >= 2 and @tokens[-2][1] == :on_semicolon
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return false
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elsif @tokens.size >= 2 and @tokens[-2][1] == :on_kw and (@tokens[-2][2] == 'begin' or @tokens[-2][2] == 'else')
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return false
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elsif !@tokens.empty? and @tokens.last[2] == "\\\n"
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return true
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elsif @tokens.size >= 2 and @tokens[-2][3].anybits?(continued_bits)
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# end of literal except for regexp
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return true
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end
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false
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end
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def check_code_block(code)
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return true if @tokens.empty?
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if @tokens.last[1] == :on_heredoc_beg
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return true
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end
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begin # check if parser error are available
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RubyVM::InstructionSequence.compile(code)
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rescue SyntaxError => e
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case e.message
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when /unterminated (?:string|regexp) meets end of file/
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# "unterminated regexp meets end of file"
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#
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# example:
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# /
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#
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# "unterminated string meets end of file"
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#
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# example:
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# '
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return true
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when /syntax error, unexpected end-of-input/
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# "syntax error, unexpected end-of-input, expecting keyword_end"
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#
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# example:
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# if ture
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# hoge
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# if false
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# fuga
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# end
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return true
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when /syntax error, unexpected keyword_end/
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# "syntax error, unexpected keyword_end"
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#
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# example:
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# if (
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# end
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#
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# example:
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# end
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return false
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when /unexpected tREGEXP_BEG/
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# "syntax error, unexpected tREGEXP_BEG, expecting keyword_do or '{' or '('"
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#
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# example:
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# method / f /
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return false
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end
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end
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last_lex_state = @tokens.last[3]
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if last_lex_state.allbits?(Ripper::EXPR_BEG)
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return false
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elsif last_lex_state.allbits?(Ripper::EXPR_DOT)
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return true
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elsif last_lex_state.allbits?(Ripper::EXPR_CLASS)
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return true
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elsif last_lex_state.allbits?(Ripper::EXPR_FNAME)
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return true
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elsif last_lex_state.allbits?(Ripper::EXPR_VALUE)
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return true
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elsif last_lex_state.allbits?(Ripper::EXPR_ARG)
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return false
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end
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false
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end
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def process_nesting_level
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@tokens.inject(0) { |indent, t|
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case t[1]
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when :on_lbracket, :on_lbrace, :on_lparen
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indent += 1
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when :on_rbracket, :on_rbrace, :on_rparen
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indent -= 1
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when :on_kw
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case t[2]
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when 'def', 'do', 'case', 'for', 'begin', 'class', 'module'
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indent += 1
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when 'if', 'unless', 'while', 'until', 'rescue'
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# postfix if/unless/while/until/rescue must be Ripper::EXPR_LABEL
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indent += 1 unless t[3].allbits?(Ripper::EXPR_LABEL)
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when 'end'
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indent -= 1
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end
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end
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# percent literals are not indented
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indent
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}
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end
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def check_string_literal
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i = 0
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start_token = []
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end_type = []
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while i < @tokens.size
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t = @tokens[i]
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case t[1]
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when :on_tstring_beg
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start_token << t
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end_type << :on_tstring_end
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when :on_regexp_beg
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start_token << t
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end_type << :on_regexp_end
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when :on_symbeg
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if (i + 1) < @tokens.size and @tokens[i + 1][1] != :on_ident
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start_token << t
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end_type << :on_tstring_end
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end
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when :on_backtick
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start_token << t
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end_type << :on_tstring_end
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when :on_qwords_beg, :on_words_beg, :on_qsymbols_beg, :on_symbols_beg
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start_token << t
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end_type << :on_tstring_end
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when :on_heredoc_beg
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start_token << t
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end_type << :on_heredoc_end
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when end_type.last
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start_token.pop
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end_type.pop
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end
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i += 1
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end
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start_token.last.nil? ? '' : start_token.last
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end
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def process_literal_type
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start_token = check_string_literal
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case start_token[1]
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when :on_tstring_beg
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case start_token[2]
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when ?" then ?"
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when /^%.$/ then ?"
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when /^%Q.$/ then ?"
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when ?' then ?'
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when /^%q.$/ then ?'
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end
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when :on_regexp_beg then ?/
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when :on_symbeg then ?:
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when :on_backtick then ?`
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when :on_qwords_beg then ?]
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when :on_words_beg then ?]
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when :on_qsymbols_beg then ?]
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when :on_symbols_beg then ?]
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when :on_heredoc_beg
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start_token[2] =~ /<<[-~]?(['"`])[_a-zA-Z0-9]+\1/
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case $1
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when ?" then ?"
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when ?' then ?'
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when ?` then ?`
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else ?"
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end
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else
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nil
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end
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end
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end
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# :startdoc:
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