1171 lines
24 KiB
Ruby
1171 lines
24 KiB
Ruby
#
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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 "irb/slex"
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require "irb/ruby-token"
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# :stopdoc:
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class RubyLex
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extend Exception2MessageMapper
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def_exception(:AlreadyDefinedToken, "Already defined token(%s)")
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def_exception(:TkReading2TokenNoKey, "key nothing(key='%s')")
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def_exception(:TkSymbol2TokenNoKey, "key nothing(key='%s')")
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def_exception(:TkReading2TokenDuplicateError,
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"key duplicate(token_n='%s', key='%s')")
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def_exception(:SyntaxError, "%s")
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def_exception(:TerminateLineInput, "Terminate Line Input")
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include RubyToken
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class << self
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attr_accessor :debug_level
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def debug?
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@debug_level > 0
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end
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end
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@debug_level = 0
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def initialize
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lex_init
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set_input(STDIN)
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@seek = 0
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@exp_line_no = @line_no = 1
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@base_char_no = 0
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@char_no = 0
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@rests = []
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@readed = []
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@here_readed = []
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@indent = 0
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@indent_stack = []
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@lex_state = EXPR_BEG
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@space_seen = false
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@here_header = false
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@post_symbeg = false
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@continue = false
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@line = ""
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@skip_space = false
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@readed_auto_clean_up = false
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@exception_on_syntax_error = true
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@prompt = nil
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end
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attr_accessor :skip_space
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attr_accessor :readed_auto_clean_up
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attr_accessor :exception_on_syntax_error
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attr_reader :seek
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attr_reader :char_no
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attr_reader :line_no
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attr_reader :indent
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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 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 get_readed
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if idx = @readed.rindex("\n")
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@base_char_no = @readed.size - (idx + 1)
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else
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@base_char_no += @readed.size
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end
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readed = @readed.join("")
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@readed = []
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readed
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end
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def getc
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while @rests.empty?
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@rests.push nil unless buf_input
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end
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c = @rests.shift
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if @here_header
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@here_readed.push c
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else
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@readed.push c
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end
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@seek += 1
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if c == "\n"
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@line_no += 1
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@char_no = 0
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else
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@char_no += 1
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end
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c
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end
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def gets
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l = ""
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while c = getc
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l.concat(c)
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break if c == "\n"
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end
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return nil if l == "" and c.nil?
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l
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end
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def eof?
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@io.eof?
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end
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def getc_of_rests
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if @rests.empty?
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nil
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else
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getc
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end
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end
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def ungetc(c = nil)
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if @here_readed.empty?
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c2 = @readed.pop
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else
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c2 = @here_readed.pop
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end
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c = c2 unless c
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@rests.unshift c #c =
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@seek -= 1
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if c == "\n"
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@line_no -= 1
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if idx = @readed.rindex("\n")
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@char_no = idx + 1
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else
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@char_no = @base_char_no + @readed.size
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end
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else
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@char_no -= 1
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end
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end
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def peek_equal?(str)
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chrs = str.split(//)
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until @rests.size >= chrs.size
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return false unless buf_input
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end
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@rests[0, chrs.size] == chrs
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end
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def peek_match?(regexp)
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while @rests.empty?
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return false unless buf_input
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end
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regexp =~ @rests.join("")
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end
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def peek(i = 0)
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while @rests.size <= i
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return nil unless buf_input
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end
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@rests[i]
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end
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def buf_input
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prompt
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line = @input.call
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return nil unless line
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@rests.concat line.chars.to_a
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true
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end
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private :buf_input
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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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@quoted = nil
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@indent = 0
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@indent_stack = []
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@lex_state = EXPR_BEG
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@space_seen = false
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@here_header = false
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@continue = false
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@post_symbeg = false
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prompt
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@line = ""
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@exp_line_no = @line_no
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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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@continue = false
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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.concat l
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if @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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@indent_stack = []
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prompt
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rescue TerminateLineInput
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initialize_input
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prompt
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get_readed
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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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until (((tk = token).kind_of?(TkNL) || tk.kind_of?(TkEND_OF_SCRIPT)) &&
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!@continue or
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tk.nil?)
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end
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line = get_readed
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if line == "" and tk.kind_of?(TkEND_OF_SCRIPT) || tk.nil?
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nil
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else
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line
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end
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end
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def token
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@prev_seek = @seek
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@prev_line_no = @line_no
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@prev_char_no = @char_no
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begin
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begin
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tk = @OP.match(self)
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@space_seen = tk.kind_of?(TkSPACE)
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@lex_state = EXPR_END if @post_symbeg && tk.kind_of?(TkOp)
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@post_symbeg = tk.kind_of?(TkSYMBEG)
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rescue SyntaxError
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raise if @exception_on_syntax_error
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tk = TkError.new(@seek, @line_no, @char_no)
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end
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end while @skip_space and tk.kind_of?(TkSPACE)
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if @readed_auto_clean_up
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get_readed
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end
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tk
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end
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ENINDENT_CLAUSE = [
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"case", "class", "def", "do", "for", "if",
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"module", "unless", "until", "while", "begin"
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]
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DEINDENT_CLAUSE = ["end"
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]
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PERCENT_LTYPE = {
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"q" => "\'",
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"Q" => "\"",
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"x" => "\`",
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"r" => "/",
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"w" => "]",
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"W" => "]",
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"i" => "]",
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"I" => "]",
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"s" => ":"
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}
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PERCENT_PAREN = {
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"{" => "}",
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"[" => "]",
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"<" => ">",
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"(" => ")"
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}
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Ltype2Token = {
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"\'" => TkSTRING,
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"\"" => TkSTRING,
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"\`" => TkXSTRING,
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"/" => TkREGEXP,
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"]" => TkDSTRING,
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":" => TkSYMBOL
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}
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DLtype2Token = {
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"\"" => TkDSTRING,
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"\`" => TkDXSTRING,
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"/" => TkDREGEXP,
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}
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def lex_init()
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@OP = IRB::SLex.new
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@OP.def_rules("\0", "\004", "\032") do |op, io|
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Token(TkEND_OF_SCRIPT)
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end
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@OP.def_rules(" ", "\t", "\f", "\r", "\13") do |op, io|
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@space_seen = true
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while getc =~ /[ \t\f\r\13]/; end
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ungetc
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Token(TkSPACE)
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end
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@OP.def_rule("#") do |op, io|
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identify_comment
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end
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@OP.def_rule("=begin",
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proc{|op, io| @prev_char_no == 0 && peek(0) =~ /\s/}) do
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|op, io|
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@ltype = "="
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until getc == "\n"; end
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until peek_equal?("=end") && peek(4) =~ /\s/
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until getc == "\n"; end
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end
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gets
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@ltype = nil
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Token(TkRD_COMMENT)
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end
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@OP.def_rule("\n") do |op, io|
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print "\\n\n" if RubyLex.debug?
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case @lex_state
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when EXPR_BEG, EXPR_FNAME, EXPR_DOT
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@continue = true
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else
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@continue = false
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@lex_state = EXPR_BEG
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until (@indent_stack.empty? ||
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[TkLPAREN, TkLBRACK, TkLBRACE,
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TkfLPAREN, TkfLBRACK, TkfLBRACE].include?(@indent_stack.last))
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@indent_stack.pop
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end
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end
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@here_header = false
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@here_readed = []
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Token(TkNL)
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end
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@OP.def_rules("*", "**",
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"=", "==", "===",
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"=~", "<=>",
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"<", "<=",
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">", ">=", ">>",
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"!", "!=", "!~") do
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|op, io|
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case @lex_state
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when EXPR_FNAME, EXPR_DOT
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@lex_state = EXPR_ARG
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else
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@lex_state = EXPR_BEG
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end
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Token(op)
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end
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@OP.def_rules("<<") do
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|op, io|
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tk = nil
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if @lex_state != EXPR_END && @lex_state != EXPR_CLASS &&
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(@lex_state != EXPR_ARG || @space_seen)
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c = peek(0)
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if /\S/ =~ c && (/["'`]/ =~ c || /\w/ =~ c || c == "-")
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tk = identify_here_document
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end
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end
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unless tk
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tk = Token(op)
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case @lex_state
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when EXPR_FNAME, EXPR_DOT
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@lex_state = EXPR_ARG
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else
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@lex_state = EXPR_BEG
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end
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end
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tk
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end
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@OP.def_rules("'", '"') do
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|op, io|
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identify_string(op)
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end
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@OP.def_rules("`") do
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|op, io|
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if @lex_state == EXPR_FNAME
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@lex_state = EXPR_END
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Token(op)
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else
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identify_string(op)
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end
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end
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@OP.def_rules('?') do
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|op, io|
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if @lex_state == EXPR_END
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@lex_state = EXPR_BEG
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Token(TkQUESTION)
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else
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ch = getc
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if @lex_state == EXPR_ARG && ch =~ /\s/
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ungetc
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@lex_state = EXPR_BEG;
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Token(TkQUESTION)
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else
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if (ch == '\\')
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read_escape
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end
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@lex_state = EXPR_END
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Token(TkINTEGER)
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end
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end
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end
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@OP.def_rules("&", "&&", "|", "||") do
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|op, io|
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@lex_state = EXPR_BEG
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Token(op)
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end
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@OP.def_rules("+=", "-=", "*=", "**=",
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"&=", "|=", "^=", "<<=", ">>=", "||=", "&&=") do
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|op, io|
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@lex_state = EXPR_BEG
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op =~ /^(.*)=$/
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Token(TkOPASGN, $1)
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end
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@OP.def_rule("+@", proc{|op, io| @lex_state == EXPR_FNAME}) do
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|op, io|
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@lex_state = EXPR_ARG
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Token(op)
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end
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@OP.def_rule("-@", proc{|op, io| @lex_state == EXPR_FNAME}) do
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|op, io|
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@lex_state = EXPR_ARG
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Token(op)
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end
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@OP.def_rules("+", "-") do
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|op, io|
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catch(:RET) do
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if @lex_state == EXPR_ARG
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if @space_seen and peek(0) =~ /[0-9]/
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throw :RET, identify_number
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else
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@lex_state = EXPR_BEG
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end
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elsif @lex_state != EXPR_END and peek(0) =~ /[0-9]/
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throw :RET, identify_number
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else
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@lex_state = EXPR_BEG
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end
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Token(op)
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end
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end
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@OP.def_rule(".") do
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|op, io|
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@lex_state = EXPR_BEG
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if peek(0) =~ /[0-9]/
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ungetc
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identify_number
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else
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# for "obj.if" etc.
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@lex_state = EXPR_DOT
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Token(TkDOT)
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end
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end
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@OP.def_rules("..", "...") do
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|op, io|
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@lex_state = EXPR_BEG
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Token(op)
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end
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lex_int2
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end
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def lex_int2
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@OP.def_rules("]", "}", ")") do
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|op, io|
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@lex_state = EXPR_END
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@indent -= 1
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@indent_stack.pop
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Token(op)
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end
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@OP.def_rule(":") do
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|op, io|
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if @lex_state == EXPR_END || peek(0) =~ /\s/
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@lex_state = EXPR_BEG
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Token(TkCOLON)
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else
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@lex_state = EXPR_FNAME
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Token(TkSYMBEG)
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end
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end
|
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@OP.def_rule("::") do
|
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|op, io|
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if @lex_state == EXPR_BEG or @lex_state == EXPR_ARG && @space_seen
|
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@lex_state = EXPR_BEG
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Token(TkCOLON3)
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else
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@lex_state = EXPR_DOT
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Token(TkCOLON2)
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end
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end
|
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@OP.def_rule("/") do
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|op, io|
|
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if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
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identify_string(op)
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elsif peek(0) == '='
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getc
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@lex_state = EXPR_BEG
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Token(TkOPASGN, "/") #/)
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elsif @lex_state == EXPR_ARG and @space_seen and peek(0) !~ /\s/
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identify_string(op)
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else
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@lex_state = EXPR_BEG
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Token("/") #/)
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end
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end
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|
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@OP.def_rules("^") do
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|op, io|
|
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@lex_state = EXPR_BEG
|
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Token("^")
|
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end
|
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|
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@OP.def_rules(",") do
|
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|op, io|
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@lex_state = EXPR_BEG
|
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Token(op)
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end
|
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|
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@OP.def_rules(";") do
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|op, io|
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@lex_state = EXPR_BEG
|
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until (@indent_stack.empty? ||
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[TkLPAREN, TkLBRACK, TkLBRACE,
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TkfLPAREN, TkfLBRACK, TkfLBRACE].include?(@indent_stack.last))
|
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@indent_stack.pop
|
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end
|
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Token(op)
|
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end
|
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|
|
@OP.def_rule("~") do
|
|
|op, io|
|
|
@lex_state = EXPR_BEG
|
|
Token("~")
|
|
end
|
|
|
|
@OP.def_rule("~@", proc{|op, io| @lex_state == EXPR_FNAME}) do
|
|
|op, io|
|
|
@lex_state = EXPR_BEG
|
|
Token("~")
|
|
end
|
|
|
|
@OP.def_rule("(") do
|
|
|op, io|
|
|
@indent += 1
|
|
if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
|
|
@lex_state = EXPR_BEG
|
|
tk_c = TkfLPAREN
|
|
else
|
|
@lex_state = EXPR_BEG
|
|
tk_c = TkLPAREN
|
|
end
|
|
@indent_stack.push tk_c
|
|
Token(tk_c)
|
|
end
|
|
|
|
@OP.def_rule("[]", proc{|op, io| @lex_state == EXPR_FNAME}) do
|
|
|op, io|
|
|
@lex_state = EXPR_ARG
|
|
Token("[]")
|
|
end
|
|
|
|
@OP.def_rule("[]=", proc{|op, io| @lex_state == EXPR_FNAME}) do
|
|
|op, io|
|
|
@lex_state = EXPR_ARG
|
|
Token("[]=")
|
|
end
|
|
|
|
@OP.def_rule("[") do
|
|
|op, io|
|
|
@indent += 1
|
|
if @lex_state == EXPR_FNAME
|
|
tk_c = TkfLBRACK
|
|
else
|
|
if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
|
|
tk_c = TkLBRACK
|
|
elsif @lex_state == EXPR_ARG && @space_seen
|
|
tk_c = TkLBRACK
|
|
else
|
|
tk_c = TkfLBRACK
|
|
end
|
|
@lex_state = EXPR_BEG
|
|
end
|
|
@indent_stack.push tk_c
|
|
Token(tk_c)
|
|
end
|
|
|
|
@OP.def_rule("{") do
|
|
|op, io|
|
|
@indent += 1
|
|
if @lex_state != EXPR_END && @lex_state != EXPR_ARG
|
|
tk_c = TkLBRACE
|
|
else
|
|
tk_c = TkfLBRACE
|
|
end
|
|
@lex_state = EXPR_BEG
|
|
@indent_stack.push tk_c
|
|
Token(tk_c)
|
|
end
|
|
|
|
@OP.def_rule('\\') do
|
|
|op, io|
|
|
if getc == "\n"
|
|
@space_seen = true
|
|
@continue = true
|
|
Token(TkSPACE)
|
|
else
|
|
read_escape
|
|
Token("\\")
|
|
end
|
|
end
|
|
|
|
@OP.def_rule('%') do
|
|
|op, io|
|
|
if @lex_state == EXPR_BEG || @lex_state == EXPR_MID
|
|
identify_quotation
|
|
elsif peek(0) == '='
|
|
getc
|
|
Token(TkOPASGN, :%)
|
|
elsif @lex_state == EXPR_ARG and @space_seen and peek(0) !~ /\s/
|
|
identify_quotation
|
|
else
|
|
@lex_state = EXPR_BEG
|
|
Token("%") #))
|
|
end
|
|
end
|
|
|
|
@OP.def_rule('$') do
|
|
|op, io|
|
|
identify_gvar
|
|
end
|
|
|
|
@OP.def_rule('@') do
|
|
|op, io|
|
|
if peek(0) =~ /[\w@]/
|
|
ungetc
|
|
identify_identifier
|
|
else
|
|
Token("@")
|
|
end
|
|
end
|
|
|
|
@OP.def_rule("") do
|
|
|op, io|
|
|
printf "MATCH: start %s: %s\n", op, io.inspect if RubyLex.debug?
|
|
if peek(0) =~ /[0-9]/
|
|
t = identify_number
|
|
elsif peek(0) =~ /[^\x00-\/:-@\[-^`{-\x7F]/
|
|
t = identify_identifier
|
|
end
|
|
printf "MATCH: end %s: %s\n", op, io.inspect if RubyLex.debug?
|
|
t
|
|
end
|
|
|
|
p @OP if RubyLex.debug?
|
|
end
|
|
|
|
def identify_gvar
|
|
@lex_state = EXPR_END
|
|
|
|
case ch = getc
|
|
when /[~_*$?!@\/\\;,=:<>".]/ #"
|
|
Token(TkGVAR, "$" + ch)
|
|
when "-"
|
|
Token(TkGVAR, "$-" + getc)
|
|
when "&", "`", "'", "+"
|
|
Token(TkBACK_REF, "$"+ch)
|
|
when /[1-9]/
|
|
while getc =~ /[0-9]/; end
|
|
ungetc
|
|
Token(TkNTH_REF)
|
|
when /\w/
|
|
ungetc
|
|
ungetc
|
|
identify_identifier
|
|
else
|
|
ungetc
|
|
Token("$")
|
|
end
|
|
end
|
|
|
|
def identify_identifier
|
|
token = ""
|
|
if peek(0) =~ /[$@]/
|
|
token.concat(c = getc)
|
|
if c == "@" and peek(0) == "@"
|
|
token.concat getc
|
|
end
|
|
end
|
|
|
|
while (ch = getc) =~ /[^\x00-\/:-@\[-^`{-\x7F]/
|
|
print ":", ch, ":" if RubyLex.debug?
|
|
token.concat ch
|
|
end
|
|
ungetc
|
|
|
|
if (ch == "!" || ch == "?") && token[0,1] =~ /\w/ && peek(0) != "="
|
|
token.concat getc
|
|
end
|
|
|
|
# almost fix token
|
|
|
|
case token
|
|
when /^\$/
|
|
return Token(TkGVAR, token)
|
|
when /^\@\@/
|
|
@lex_state = EXPR_END
|
|
# p Token(TkCVAR, token)
|
|
return Token(TkCVAR, token)
|
|
when /^\@/
|
|
@lex_state = EXPR_END
|
|
return Token(TkIVAR, token)
|
|
end
|
|
|
|
if @lex_state != EXPR_DOT
|
|
print token, "\n" if RubyLex.debug?
|
|
|
|
token_c, *trans = TkReading2Token[token]
|
|
if token_c
|
|
# reserved word?
|
|
|
|
if (@lex_state != EXPR_BEG &&
|
|
@lex_state != EXPR_FNAME &&
|
|
trans[1])
|
|
# modifiers
|
|
token_c = TkSymbol2Token[trans[1]]
|
|
@lex_state = trans[0]
|
|
else
|
|
if @lex_state != EXPR_FNAME
|
|
if ENINDENT_CLAUSE.include?(token)
|
|
# check for ``class = val'' etc.
|
|
valid = true
|
|
case token
|
|
when "class"
|
|
valid = false unless peek_match?(/^\s*(<<|\w|::)/)
|
|
when "def"
|
|
valid = false if peek_match?(/^\s*(([+\-\/*&\|^]|<<|>>|\|\||\&\&)=|\&\&|\|\|)/)
|
|
when "do"
|
|
valid = false if peek_match?(/^\s*([+\-\/*]?=|\*|<|>|\&)/)
|
|
when *ENINDENT_CLAUSE
|
|
valid = false if peek_match?(/^\s*([+\-\/*]?=|\*|<|>|\&|\|)/)
|
|
else
|
|
# no nothing
|
|
end
|
|
if valid
|
|
if token == "do"
|
|
if ![TkFOR, TkWHILE, TkUNTIL].include?(@indent_stack.last)
|
|
@indent += 1
|
|
@indent_stack.push token_c
|
|
end
|
|
else
|
|
@indent += 1
|
|
@indent_stack.push token_c
|
|
end
|
|
end
|
|
|
|
elsif DEINDENT_CLAUSE.include?(token)
|
|
@indent -= 1
|
|
@indent_stack.pop
|
|
end
|
|
@lex_state = trans[0]
|
|
else
|
|
@lex_state = EXPR_END
|
|
end
|
|
end
|
|
return Token(token_c, token)
|
|
end
|
|
end
|
|
|
|
if @lex_state == EXPR_FNAME
|
|
@lex_state = EXPR_END
|
|
if peek(0) == '='
|
|
token.concat getc
|
|
end
|
|
elsif @lex_state == EXPR_BEG || @lex_state == EXPR_DOT
|
|
@lex_state = EXPR_ARG
|
|
else
|
|
@lex_state = EXPR_END
|
|
end
|
|
|
|
if token[0, 1] =~ /[A-Z]/
|
|
return Token(TkCONSTANT, token)
|
|
elsif token[token.size - 1, 1] =~ /[!?]/
|
|
return Token(TkFID, token)
|
|
else
|
|
return Token(TkIDENTIFIER, token)
|
|
end
|
|
end
|
|
|
|
def identify_here_document
|
|
ch = getc
|
|
if ch == "-"
|
|
ch = getc
|
|
indent = true
|
|
end
|
|
if /['"`]/ =~ ch
|
|
lt = ch
|
|
quoted = ""
|
|
while (c = getc) && c != lt
|
|
quoted.concat c
|
|
end
|
|
else
|
|
lt = '"'
|
|
quoted = ch.dup
|
|
while (c = getc) && c =~ /\w/
|
|
quoted.concat c
|
|
end
|
|
ungetc
|
|
end
|
|
|
|
ltback, @ltype = @ltype, lt
|
|
reserve = []
|
|
while ch = getc
|
|
reserve.push ch
|
|
if ch == "\\"
|
|
reserve.push ch = getc
|
|
elsif ch == "\n"
|
|
break
|
|
end
|
|
end
|
|
|
|
@here_header = false
|
|
|
|
line = ""
|
|
while ch = getc
|
|
if ch == "\n"
|
|
if line == quoted
|
|
break
|
|
end
|
|
line = ""
|
|
else
|
|
line.concat ch unless indent && line == "" && /\s/ =~ ch
|
|
if @ltype != "'" && ch == "#" && peek(0) == "{"
|
|
identify_string_dvar
|
|
end
|
|
end
|
|
end
|
|
|
|
@here_header = true
|
|
@here_readed.concat reserve
|
|
while ch = reserve.pop
|
|
ungetc ch
|
|
end
|
|
|
|
@ltype = ltback
|
|
@lex_state = EXPR_END
|
|
Token(Ltype2Token[lt])
|
|
end
|
|
|
|
def identify_quotation
|
|
ch = getc
|
|
if lt = PERCENT_LTYPE[ch]
|
|
ch = getc
|
|
elsif ch =~ /\W/
|
|
lt = "\""
|
|
else
|
|
RubyLex.fail SyntaxError, "unknown type of %string"
|
|
end
|
|
@quoted = ch unless @quoted = PERCENT_PAREN[ch]
|
|
identify_string(lt, @quoted)
|
|
end
|
|
|
|
def identify_number
|
|
@lex_state = EXPR_END
|
|
|
|
if peek(0) == "0" && peek(1) !~ /[.eE]/
|
|
getc
|
|
case peek(0)
|
|
when /[xX]/
|
|
ch = getc
|
|
match = /[0-9a-fA-F_]/
|
|
when /[bB]/
|
|
ch = getc
|
|
match = /[01_]/
|
|
when /[oO]/
|
|
ch = getc
|
|
match = /[0-7_]/
|
|
when /[dD]/
|
|
ch = getc
|
|
match = /[0-9_]/
|
|
when /[0-7]/
|
|
match = /[0-7_]/
|
|
when /[89]/
|
|
RubyLex.fail SyntaxError, "Invalid octal digit"
|
|
else
|
|
return Token(TkINTEGER)
|
|
end
|
|
|
|
len0 = true
|
|
non_digit = false
|
|
while ch = getc
|
|
if match =~ ch
|
|
if ch == "_"
|
|
if non_digit
|
|
RubyLex.fail SyntaxError, "trailing `#{ch}' in number"
|
|
else
|
|
non_digit = ch
|
|
end
|
|
else
|
|
non_digit = false
|
|
len0 = false
|
|
end
|
|
else
|
|
ungetc
|
|
if len0
|
|
RubyLex.fail SyntaxError, "numeric literal without digits"
|
|
end
|
|
if non_digit
|
|
RubyLex.fail SyntaxError, "trailing `#{non_digit}' in number"
|
|
end
|
|
break
|
|
end
|
|
end
|
|
return Token(TkINTEGER)
|
|
end
|
|
|
|
type = TkINTEGER
|
|
allow_point = true
|
|
allow_e = true
|
|
non_digit = false
|
|
while ch = getc
|
|
case ch
|
|
when /[0-9]/
|
|
non_digit = false
|
|
when "_"
|
|
non_digit = ch
|
|
when allow_point && "."
|
|
if non_digit
|
|
RubyLex.fail SyntaxError, "trailing `#{non_digit}' in number"
|
|
end
|
|
type = TkFLOAT
|
|
if peek(0) !~ /[0-9]/
|
|
type = TkINTEGER
|
|
ungetc
|
|
break
|
|
end
|
|
allow_point = false
|
|
when allow_e && "e", allow_e && "E"
|
|
if non_digit
|
|
RubyLex.fail SyntaxError, "trailing `#{non_digit}' in number"
|
|
end
|
|
type = TkFLOAT
|
|
if peek(0) =~ /[+-]/
|
|
getc
|
|
end
|
|
allow_e = false
|
|
allow_point = false
|
|
non_digit = ch
|
|
else
|
|
if non_digit
|
|
RubyLex.fail SyntaxError, "trailing `#{non_digit}' in number"
|
|
end
|
|
ungetc
|
|
break
|
|
end
|
|
end
|
|
Token(type)
|
|
end
|
|
|
|
def identify_string(ltype, quoted = ltype)
|
|
@ltype = ltype
|
|
@quoted = quoted
|
|
subtype = nil
|
|
begin
|
|
nest = 0
|
|
while ch = getc
|
|
if @quoted == ch and nest == 0
|
|
break
|
|
elsif @ltype != "'" && ch == "#" && peek(0) == "{"
|
|
identify_string_dvar
|
|
elsif @ltype != "'" && @ltype != "]" && @ltype != ":" and ch == "#"
|
|
subtype = true
|
|
elsif ch == '\\' and @ltype == "'" #'
|
|
case ch = getc
|
|
when "\\", "\n", "'"
|
|
else
|
|
ungetc
|
|
end
|
|
elsif ch == '\\' #'
|
|
read_escape
|
|
end
|
|
if PERCENT_PAREN.values.include?(@quoted)
|
|
if PERCENT_PAREN[ch] == @quoted
|
|
nest += 1
|
|
elsif ch == @quoted
|
|
nest -= 1
|
|
end
|
|
end
|
|
end
|
|
if @ltype == "/"
|
|
while /[imxoesun]/ =~ peek(0)
|
|
getc
|
|
end
|
|
end
|
|
if subtype
|
|
Token(DLtype2Token[ltype])
|
|
else
|
|
Token(Ltype2Token[ltype])
|
|
end
|
|
ensure
|
|
@ltype = nil
|
|
@quoted = nil
|
|
@lex_state = EXPR_END
|
|
end
|
|
end
|
|
|
|
def identify_string_dvar
|
|
begin
|
|
getc
|
|
|
|
reserve_continue = @continue
|
|
reserve_ltype = @ltype
|
|
reserve_indent = @indent
|
|
reserve_indent_stack = @indent_stack
|
|
reserve_state = @lex_state
|
|
reserve_quoted = @quoted
|
|
|
|
@ltype = nil
|
|
@quoted = nil
|
|
@indent = 0
|
|
@indent_stack = []
|
|
@lex_state = EXPR_BEG
|
|
|
|
loop do
|
|
@continue = false
|
|
prompt
|
|
tk = token
|
|
if @ltype or @continue or @indent >= 0
|
|
next
|
|
end
|
|
break if tk.kind_of?(TkRBRACE)
|
|
end
|
|
ensure
|
|
@continue = reserve_continue
|
|
@ltype = reserve_ltype
|
|
@indent = reserve_indent
|
|
@indent_stack = reserve_indent_stack
|
|
@lex_state = reserve_state
|
|
@quoted = reserve_quoted
|
|
end
|
|
end
|
|
|
|
def identify_comment
|
|
@ltype = "#"
|
|
|
|
while ch = getc
|
|
if ch == "\n"
|
|
@ltype = nil
|
|
ungetc
|
|
break
|
|
end
|
|
end
|
|
return Token(TkCOMMENT)
|
|
end
|
|
|
|
def read_escape
|
|
case ch = getc
|
|
when "\n", "\r", "\f"
|
|
when "\\", "n", "t", "r", "f", "v", "a", "e", "b", "s" #"
|
|
when /[0-7]/
|
|
ungetc ch
|
|
3.times do
|
|
case ch = getc
|
|
when /[0-7]/
|
|
when nil
|
|
break
|
|
else
|
|
ungetc
|
|
break
|
|
end
|
|
end
|
|
|
|
when "x"
|
|
2.times do
|
|
case ch = getc
|
|
when /[0-9a-fA-F]/
|
|
when nil
|
|
break
|
|
else
|
|
ungetc
|
|
break
|
|
end
|
|
end
|
|
|
|
when "M"
|
|
if (ch = getc) != '-'
|
|
ungetc
|
|
else
|
|
if (ch = getc) == "\\" #"
|
|
read_escape
|
|
end
|
|
end
|
|
|
|
when "C", "c" #, "^"
|
|
if ch == "C" and (ch = getc) != "-"
|
|
ungetc
|
|
elsif (ch = getc) == "\\" #"
|
|
read_escape
|
|
end
|
|
else
|
|
# other characters
|
|
end
|
|
end
|
|
end
|
|
# :startdoc:
|