Class: Arcana::Pattern

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(type, value) ⇒ Pattern

Returns a new instance of Pattern.



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# File 'lib/arcana.rb', line 133

def initialize(type, value)
  type, *@flags = type.split("/")
  @type, *@type_ops = type.split(/(?=[&%+-])/)
  @value = value
end

Instance Attribute Details

#flags ⇒ Object (readonly)

Returns the value of attribute flags.



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# File 'lib/arcana.rb', line 131

def flags
  @flags
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/arcana.rb', line 131

def type
  @type
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/arcana.rb', line 131

def value
  @value
end

Instance Method Details

#match?(input) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/arcana.rb', line 139

def match?(input)
  return true if @value == "x"

  return if !input
  return if input.eof?
  flags = @flags.dup

  case @type
  when "string", "ustring"
    flags.delete("b") # force on binary files
    flags.delete("t") # force on text files 

    flags.delete("w") # FIXME: blanks
    flags.delete("W") # FIXME: blanks
    flags.delete("c") # FIXME: case insensitive
    flags.delete("C") # FIXME: case insensitive

    if @value.start_with?("!")
      test_string = parse_string(@value[1..])
      input.read(test_string.length) != test_string
    elsif @value.start_with?("=")
      test_string = parse_string(@value[1..])
      input.read(test_string.length) == test_string
    else
      test_string = parse_string(@value)
      input.read(test_string.length) == test_string
    end
  when "byte"
    match_packed_integer?(input, "c", 1)
  when "ubyte"
    match_packed_integer?(input, "C", 1)
  when "short"
    match_packed_integer?(input, "s", 2)
  when "ushort"
    match_packed_integer?(input, "S", 2)
  when "long"
    match_packed_integer?(input, "l", 4)
  when "ulong"
    match_packed_integer?(input, "L", 4)
  when "quad"
    match_packed_integer?(input, "q", 8)
  when "uquad"
    match_packed_integer?(input, "Q", 8)
  when "leshort"
    match_packed_integer?(input, "s<", 2)
  when "uleshort"
    match_packed_integer?(input, "S<", 2)
  when "beshort"
    match_packed_integer?(input, "s>", 2)
  when "ubeshort"
    match_packed_integer?(input, "S>", 2)
  when "lelong"
    match_packed_integer?(input, "l<", 4)
  when "ulelong"
    match_packed_integer?(input, "L<", 4)
  when "belong"
    match_packed_integer?(input, "l>", 4)
  when "ubelong"
    match_packed_integer?(input, "L>", 4)
  when "bequad"
    match_packed_integer?(input, "q>", 8)
  when "ubequad"
    match_packed_integer?(input, "Q>", 8)
  when "lequad"
    match_packed_integer?(input, "q<", 8)
  when "ulequad"
    match_packed_integer?(input, "Q<", 8)
  when "pstring"
    return false # FIXME
  when "guid"
    return false # FIXME
  when "der"
    return false # FIXME
  when "lestring16"
    return false # FIXME
  when "default"
    return true # FIXME
  when "clear"
    return true # FIXME
  when "name"
    return false
  when "use"
    return false
  when "offset"
    match_integer?(input.offset)
  when "indirect"
    return false # FIXME
  when "ledate"
    return false # FIXME
  when "bedate"
    return false # FIXME
  when "beldate"
    return false # FIXME
  when "beqdate"
    return false # FIXME
  when "lefloat"
    return false # FIXME
  when "regex"
    if length = flags[0]
      if length.end_with?("l")
        # lines
        length = 8196
      elsif length.match?(/\A[0-9]+\z/)
        length = Integer(length)
      else
        return false # FIXME
      end
    else
      length = 8196
    end
    regex = parse_string(@value)
    # FIXME: seek input to result location
    input.peek(length).match?(regex)
  when "search"
    flags = @flags

    flags.delete("b") # force on binary files
    flags.delete("t") # force on text files 

    flags.delete("c") # FIXME: case insensitive
    flags.delete("C") # FIXME: case insensitive

    flags = ["1"] if flags.empty? # FIXME: WTF?
    search_input = input.peek(@value.size + Integer(flags[0]) - 1)
    flags = flags[1..]

    value = parse_string(@value)

    # FIXME: seek input to result location
    search_input.include?(value)
  else
    raise "Unsupported match type: #{@type}"
  end
end