Class: Dendroid::Lexical::Literal

Inherits:

Token

• Object
• Token
• Dendroid::Lexical::Literal

Defined in:

lib/dendroid/lexical/literal.rb

Overview

A literal (value) is a token that represents a data value in the parsed language. For instance, in Ruby data values such as strings, numbers, regular expression,… can appear directly in the source code as text. These are examples of literal values. One responsibility of a tokenizer/lexer is to convert the text representation into a corresponding value in a convenient format for the interpreter/compiler.

Instance Attribute Summary

• #value ⇒ Object readonly

  The value expressed in one of the target datatype.

Attributes inherited from Token

#position, #source, #terminal

Instance Method Summary

• #initialize(original, pos, symbol, aValue) ⇒ Literal constructor

  Constructor.

• #literal? ⇒ Boolean

  True if the token is a literal (has a value associated with is).

Methods inherited from Token

#pos_to_s

Constructor Details

#initialize(original, pos, symbol, aValue) ⇒ Literal

Constructor.

Parameters:

• original (String) —

  the piece of text from input

• pos (Dendroid::Lexical::TokenPosition) —

  line, column position of token

• symbol (Dendroid::Syntax::Terminal, String)
• aValue (Object) —

  value of the token in internal representation

# File 'lib/dendroid/lexical/literal.rb', line 22

def initialize(original, pos, symbol, aValue)
  super(original, pos, symbol)
  @value = aValue
end

Instance Attribute Details

#value ⇒ Object (readonly)

Returns The value expressed in one of the target datatype.

Returns:

• (Object) —

  The value expressed in one of the target datatype.

# File 'lib/dendroid/lexical/literal.rb', line 15

def value
  @value
end

Instance Method Details

#literal? ⇒ Boolean

Returns true if the token is a literal (has a value associated with is).

Returns:

• (Boolean) —

  true if the token is a literal (has a value associated with is)

# File 'lib/dendroid/lexical/literal.rb', line 28

def literal?
  true
end