Class: RubyLexer::CharHandler

Inherits:
Object
  • Object
show all
Defined in:
lib/rubylexer/charhandler.rb

Overview

Constant Summary collapse

CHARSETSPECIALS = 
CharSet[?[ ,?] ,?\\ ,?-]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(receiver, default, hash) ⇒ CharHandler

Returns a new instance of CharHandler.



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# File 'lib/rubylexer/charhandler.rb', line 30

def initialize(receiver,default,hash) 
  @default=default 
  @receiver=receiver
  if ?A.is_a? String #ruby >= 1.9
    @table={}
  else
    @table=Array.new(0)
  end
  @matcher='^[^'

  hash.each_pair {|pattern,action|
    case pattern
    when Range
      pattern.each { |c|
        self[c]=action
      }
    when String
      CharHandler.each_char(pattern) {|b| self[b]=action }
    when Fixnum
      self[pattern]=action
    else
      raise "invalid pattern class #{pattern.class}: #{pattern}"
    end
  }

  @matcher += ']$'
  @matcher=Regexp.new(@matcher,0,'n')

  freeze
end

Class Method Details

.each_char(str, &block) ⇒ Object 



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# File 'lib/rubylexer/charhandler.rb', line 63

def self.each_char(str,&block)
  str.each_char(&block)
end

Instance Method Details

#[]=(b, action) ⇒ Object 



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# File 'lib/rubylexer/charhandler.rb', line 73

def []=(b,action)  #for use in initialize only
  assert b >= ?\x00
  assert b <= ?\x7F
  assert !frozen?

  @table[b]=action
  @matcher << ?\\ if CHARSETSPECIALS===b
  @matcher << b
end

#go(b, *args) ⇒ Object 



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# File 'lib/rubylexer/charhandler.rb', line 85

def go(b,*args)
  @receiver.send((@table[b] or @default), b.chr, *args)
end