Class: Regin::Parser

Inherits:
Racc::Parser
  • Object
show all
Defined in:
lib/rack/mount/vendor/regin/regin/parser.rb,
lib/rack/mount/vendor/regin/regin/tokenizer.rb

Overview

:nodoc: all

Defined Under Namespace

Classes: ScanError

Constant Summary collapse

Racc_arg = 
[
racc_action_table,
racc_action_check,
racc_action_default,
racc_action_pointer,
racc_goto_table,
racc_goto_check,
racc_goto_default,
racc_goto_pointer,
racc_nt_base,
racc_reduce_table,
racc_token_table,
racc_shift_n,
racc_reduce_n,
racc_use_result_var ]
Racc_token_to_s_table = 
[
"$end",
"error",
"BAR",
"LBRACK",
"RBRACK",
"NEGATE",
"CCLASS",
"DOT",
"CHAR",
"LPAREN",
"RPAREN",
"QMARK",
"EQUAL",
"BANG",
"COLON",
"NAME",
"L_ANCHOR",
"R_ANCHOR",
"STAR",
"PLUS",
"LCURLY",
"RCURLY",
"\"alnum\"",
"\"alpha\"",
"\"ascii\"",
"\"blank\"",
"\"cntrl\"",
"\"digit\"",
"\"graph\"",
"\"lower\"",
"\"print\"",
"\"punct\"",
"\"space\"",
"\"upper\"",
"\"word\"",
"\"xdigit\"",
"MINUS",
"MULTILINE",
"IGNORECASE",
"EXTENDED",
"$start",
"expression",
"alternation",
"subexpression",
"expression_ary",
"quantified_atom",
"atom",
"quantifier",
"group",
"bracket_expression",
"anchor",
"options",
"quantifier_char",
"posix_bracket_expression",
"posix_bracket_type",
"modifier" ]
Racc_debug_parser = 
false

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 24

def initialize
  @capture_index = 0
  @capture_index_stack = []
  @options_stack = []
end

Instance Attribute Details

#filename ⇒ Object (readonly)

Returns the value of attribute filename.



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 14

def filename
  @filename
end

#lineno ⇒ Object (readonly)

Returns the value of attribute lineno.



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 13

def lineno
  @lineno
end

#options_stack ⇒ Object

Returns the value of attribute options_stack.



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 22

def options_stack
  @options_stack
end

#state ⇒ Object

Returns the value of attribute state.



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 15

def state
  @state
end

Class Method Details

.parse_regexp(regexp) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 11

def self.parse_regexp(regexp)
  options = Options.from_int(regexp.options)

  parser = new
  parser.options_stack << options.to_h

  expression = parser.scan_str(regexp.source)
  expression = expression.dup(options.to_h) if options.any?
  expression
end

Instance Method Details

#_next_token ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 54

def _next_token
  text = @ss.peek(1)
  @lineno  +=  1  if text == "\n"
  token = case @state
  when nil
    case
    when (text = @ss.scan(/\\[dDsSwW]/))
       action { [:CCLASS, text] }

    when (text = @ss.scan(/\^|\\A/))
       action { [:L_ANCHOR, text] }

    when (text = @ss.scan(/\$|\\Z/))
       action { [:R_ANCHOR, text] }

    when (text = @ss.scan(/<(\w+)>/))
       action { [:NAME, @ss[1]] }

    when (text = @ss.scan(/\(/))
       action {
  @capture_index_stack << @capture_index
  @capture_index += 1
  @state = :OPTIONS if @ss.peek(1) == '?';
  [:LPAREN, text]
}


    when (text = @ss.scan(/\)/))
       action { [:RPAREN,  text] }

    when (text = @ss.scan(/\[/))
       action { @state = :CCLASS; [:LBRACK,  text] }

    when (text = @ss.scan(/\{/))
       action { [:LCURLY,  text] }

    when (text = @ss.scan(/\}/))
       action { [:RCURLY,  text] }

    when (text = @ss.scan(/\|/))
       action { [:BAR, text]   }

    when (text = @ss.scan(/\./))
       action { [:DOT, text]   }

    when (text = @ss.scan(/\!/))
       action { [:BANG, text]  }

    when (text = @ss.scan(/\=/))
       action { [:EQUAL, text] }

    when (text = @ss.scan(/\?/))
       action { [:QMARK, text] }

    when (text = @ss.scan(/\+/))
       action { [:PLUS,  text] }

    when (text = @ss.scan(/\*/))
       action { [:STAR,  text] }

    when (text = @ss.scan(/\#/))
       action {
  if @options_stack[-1][:extended]
    @state = :COMMENT;
    next_token
  else
    [:CHAR, text]
  end
}


    when (text = @ss.scan(/\s|\n/))
       action {
  if @options_stack[-1][:extended]
    next_token
  else
    [:CHAR, text]
  end
}


    when (text = @ss.scan(/\\(.)/))
       action { [:CHAR, @ss[1]] }

    when (text = @ss.scan(/./))
       action { [:CHAR, text] }

    else
      text = @ss.string[@ss.pos .. -1]
      raise  ScanError, "can not match: '" + text + "'"
    end  # if

  when :CCLASS
    case
    when (text = @ss.scan(/\[/))
       action { [:LBRACK,  text] }

    when (text = @ss.scan(/\]/))
       action { @state = nil; [:RBRACK, text] }

    when (text = @ss.scan(/\^/))
       action { [@ss.string[@ss.pos-2, 1] == '[' ? :NEGATE : :CHAR, text] }

    when (text = @ss.scan(/:/))
       action {
  if @ss.string[@ss.pos-2, 1] == '['
    @state = :POSIX_CCLASS
    [:COLON, text]
  else
    [:CHAR, text]
  end
}


    when (text = @ss.scan(/\\-/))
       action { [:CHAR, text] }

    when (text = @ss.scan(/\\[dDsSwW]/))
       action { [:CHAR, text] }

    when (text = @ss.scan(/\\(.)/))
       action { [:CHAR, @ss[1]] }

    when (text = @ss.scan(/./))
       action { [:CHAR, text] }

    else
      text = @ss.string[@ss.pos .. -1]
      raise  ScanError, "can not match: '" + text + "'"
    end  # if

  when :POSIX_CCLASS
    case
    when (text = @ss.scan(/\w+/))
       action { [text, text] }

    when (text = @ss.scan(/:/))
       action { [:COLON, text] }

    when (text = @ss.scan(/\]/))
       action { @state = :CCLASS; [:RBRACK, text] }

    else
      text = @ss.string[@ss.pos .. -1]
      raise  ScanError, "can not match: '" + text + "'"
    end  # if

  when :OPTIONS
    case
    when (text = @ss.scan(/\?/))
       action {
  @state = nil unless @ss.peek(1) =~ /-|m|i|x|:/
  [:QMARK, text]
}


    when (text = @ss.scan(/\-/))
       action { [:MINUS, text] }

    when (text = @ss.scan(/m/))
       action { [:MULTILINE, text] }

    when (text = @ss.scan(/i/))
       action { [:IGNORECASE, text] }

    when (text = @ss.scan(/x/))
       action { [:EXTENDED, text] }

    when (text = @ss.scan(/\:/))
       action {
  @capture_index_stack.pop
  @capture_index -= 1
  @state = nil;
  [:COLON, text]
}


    else
      text = @ss.string[@ss.pos .. -1]
      raise  ScanError, "can not match: '" + text + "'"
    end  # if

  when :COMMENT
    case
    when (text = @ss.scan(/\n/))
       action { @state = nil; next_token }

    when (text = @ss.scan(/./))
       action { next_token }

    else
      text = @ss.string[@ss.pos .. -1]
      raise  ScanError, "can not match: '" + text + "'"
    end  # if

  else
    raise  ScanError, "undefined state: '" + state.to_s + "'"
  end  # case state
  token
end

#_reduce_1(val, _values, result) ⇒ Object

reduce 0 omitted



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 313

def _reduce_1(val, _values, result)
 result = Expression.new(val[0]) 
    result
end

#_reduce_11(val, _values, result) ⇒ Object

reduce 10 omitted



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 354

def _reduce_11(val, _values, result)
 result = CharacterClass.new(val[1]) 
    result
end

#_reduce_12(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 359

def _reduce_12(val, _values, result)
 result = CharacterClass.new(val[2], :negate => true) 
    result
end

#_reduce_13(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 364

def _reduce_13(val, _values, result)
 result = CharacterClass.new(val[0]) 
    result
end

#_reduce_14(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 369

def _reduce_14(val, _values, result)
 result = CharacterClass.new('.') 
    result
end

#_reduce_15(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 374

def _reduce_15(val, _values, result)
 result = Anchor.new(val[0]) 
    result
end

#_reduce_16(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 379

def _reduce_16(val, _values, result)
 result = Character.new(val[0]) 
    result
end

#_reduce_17(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 384

def _reduce_17(val, _values, result)
	  result = Group.new(val[1], :index => @capture_index_stack.pop)
	
    result
end

#_reduce_18(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 390

def _reduce_18(val, _values, result)
	 result = Group.new(val[3], :index => @capture_index_stack.pop, :lookahead => :postive)
       
    result
end

#_reduce_19(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 396

def _reduce_19(val, _values, result)
	 result = Group.new(val[3], :index => @capture_index_stack.pop, :lookahead => :negative)
       
    result
end

#_reduce_20(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 402

def _reduce_20(val, _values, result)
	  result = Group.new(val[4], val[2].merge(:capture => false))
	  @options_stack.pop
	
    result
end

#_reduce_21(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 409

def _reduce_21(val, _values, result)
	  result = Group.new(val[3], :capture => false);
	
    result
end

#_reduce_22(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 415

def _reduce_22(val, _values, result)
	  result = Group.new(val[3], :name => val[2], :index => @capture_index_stack.pop);
	
    result
end

#_reduce_28(val, _values, result) ⇒ Object

reduce 27 omitted



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 431

def _reduce_28(val, _values, result)
 result = val.join 
    result
end

#_reduce_29(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 436

def _reduce_29(val, _values, result)
 result = val.join 
    result
end

#_reduce_3(val, _values, result) ⇒ Object

reduce 2 omitted



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 320

def _reduce_3(val, _values, result)
 result = val[0] + [val[2]] 
    result
end

#_reduce_30(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 441

def _reduce_30(val, _values, result)
 result = val.join 
    result
end

#_reduce_31(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 446

def _reduce_31(val, _values, result)
 result = val.join 
    result
end

#_reduce_33(val, _values, result) ⇒ Object

reduce 32 omitted



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 453

def _reduce_33(val, _values, result)
 result = val.join 
    result
end

#_reduce_34(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 458

def _reduce_34(val, _values, result)
 result = val.join 
    result
end

#_reduce_37(val, _values, result) ⇒ Object

reduce 36 omitted



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 467

def _reduce_37(val, _values, result)
 result = val.join 
    result
end

#_reduce_4(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 325

def _reduce_4(val, _values, result)
 result = Alternation.new(val[0], val[2])  
    result
end

#_reduce_5(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 330

def _reduce_5(val, _values, result)
 result = Expression.new(val[0]) 
    result
end

#_reduce_52(val, _values, result) ⇒ Object

reduce 51 omitted



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 500

def _reduce_52(val, _values, result)
	    @options_stack << result = { val[1] => false, val[2] => false, val[3] => false }
	  
    result
end

#_reduce_53(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 506

def _reduce_53(val, _values, result)
	    @options_stack << result = { val[0] => true, val[2] => false, val[3] => false }
	  
    result
end

#_reduce_54(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 512

def _reduce_54(val, _values, result)
	    @options_stack << result = { val[0] => true, val[1] => true, val[3] => false }
	  
    result
end

#_reduce_55(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 518

def _reduce_55(val, _values, result)
	    @options_stack << result = { val[0] => true, val[1] => true, val[2] => true }
	  
    result
end

#_reduce_56(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 524

def _reduce_56(val, _values, result)
 result = :multiline 
    result
end

#_reduce_57(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 529

def _reduce_57(val, _values, result)
 result = :ignorecase 
    result
end

#_reduce_58(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 534

def _reduce_58(val, _values, result)
 result = :extended 
    result
end

#_reduce_6(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 335

def _reduce_6(val, _values, result)
 result = val[0] + [val[1]] 
    result
end

#_reduce_7(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 340

def _reduce_7(val, _values, result)
 result = [val[0]] 
    result
end

#_reduce_8(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 345

def _reduce_8(val, _values, result)
 result = val[0].dup(:quantifier => val[1]) 
    result
end

#_reduce_none(val, _values, result) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/parser.rb', line 539

def _reduce_none(val, _values, result)
  val[0]
end

#action ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 23

def action
  yield
end

#load_file(filename) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 33

def load_file( filename )
  @filename = filename
  open(filename, "r") do |f|
    scan_setup(f.read)
  end
end

#next_token ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 46

def next_token
  return if @ss.eos?
  
  # skips empty actions
  until token = _next_token or @ss.eos?; end
  token
end

#scan_file(filename) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 40

def scan_file( filename )
  load_file(filename)
  do_parse
end

#scan_setup(str) ⇒ Object 



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 17

def scan_setup(str)
  @ss = StringScanner.new(str)
  @lineno =  1
  @state  = nil
end

#scan_str(str) ⇒ Object Also known as: scan 



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# File 'lib/rack/mount/vendor/regin/regin/tokenizer.rb', line 27

def scan_str(str)
  scan_setup(str)
  do_parse
end