Class: SDL4R::Parser::Token

Inherits:
Object
  • Object
show all
Defined in:
lib/sdl4r/parser/token.rb

Overview

An SDL token.

Author:

  • Daniel Leuck, Philippe Vosges

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(text, line = -1,, position = -1)) ⇒ Token

:nodoc: all



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# File 'lib/sdl4r/parser/token.rb', line 33

def initialize(text, line = -1, position = -1)
  @text = text
  @line = line
  @position = position
  @size = text.length

  begin
    @type = nil
    @object = nil

    if text =~ /^["`]/
      @type = :STRING
      @object = Parser.parse_string(text)

    elsif text =~ /^'/
      @type = :CHARACTER
      @object = text[1...-1]

    elsif text == "null"
      @type = :NULL
      @object = nil

    elsif text =~ /^true$|^on$/
      @type = :BOOLEAN
      @object = true

    elsif text =~ /^false$|^off$/
      @type = :BOOLEAN
      @object = false

    elsif text =~ /^\[/
      @type=:BINARY
      @object = Parser.parse_binary(text)

    elsif text =~ /^\d+\/\d+\/\d+$/
      @type = :DATE;
      @object = Parser.parse_date_time(text)

    elsif text =~ /^-?\d+d?:\d+/
      @type = :TIME
      @object = parse_time_span_with_zone(text)

    elsif text =~ /^[\d\-\.]/
      @type = :NUMBER
      @object = Parser.parse_number(text)

    else
      case text[0]
      when ?{
        @type = :START_BLOCK
      when ?}
        @type = :END_BLOCK
      when ?=
        @type = :EQUALS
      when ?:
        @type = :COLON
      when ?;
        @type = :SEMICOLON
      end
    end

  rescue ArgumentError
    raise SdlParseError.new($!.message, @line, @position)
  end

  @type = :IDENTIFIER if @type.nil? # if all hope is lost, it's an identifier

  @punctuation =
    @type == :COLON || @type == :SEMICOLON || @type == :EQUALS ||
    @type == :START_BLOCK || @type == :END_BLOCK
  @literal = @type != :IDENTIFIER && !@punctuation
end

Instance Attribute Details

#line ⇒ Object (readonly)

Returns the value of attribute line.



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# File 'lib/sdl4r/parser/token.rb', line 106

def line
  @line
end

#position ⇒ Object (readonly)

Returns the value of attribute position.



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# File 'lib/sdl4r/parser/token.rb', line 106

def position
  @position
end

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/sdl4r/parser/token.rb', line 106

def text
  @text
end

#type ⇒ Object (readonly)

Returns the value of attribute type.



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# File 'lib/sdl4r/parser/token.rb', line 106

def type
  @type
end

Instance Method Details

#literal? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/sdl4r/parser/token.rb', line 108

def literal?
  @literal
end

#object_for_literal ⇒ Object

Returns the Ruby object corresponding to this literal (or nil if it is not a literal).



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# File 'lib/sdl4r/parser/token.rb', line 114

def object_for_literal
  return @object
end

#parse_time_span_with_zone(literal) ⇒ Object

This special parse method is used only by the Token class for tokens which are ambiguously either a TimeSpan or the time component of a date/time type



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# File 'lib/sdl4r/parser/token.rb', line 125

def parse_time_span_with_zone(literal)
  raise ArgumentError("time span or date literal is nil") if literal.nil?

  days, hours, minutes, seconds, time_zone_offset =
    Parser.parse_time_span_and_time_zone(literal, true, true)

  return Parser::TimeSpanWithZone.new(days, hours, minutes, seconds, time_zone_offset)
end

#to_s ⇒ Object 



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# File 'lib/sdl4r/parser/token.rb', line 118

def to_s
  @type.to_s + " " + @text + " pos:" + @position.to_s
end