Class: LexicalRule

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

Overview

The RCTP class for lexical rules.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(symbol, regex, &action) ⇒ LexicalRule

Create a lexical rule.



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# File 'lib/lexical_analyzer/lexical_rule.rb', line 10

def initialize(symbol, regex, &action)
  @symbol = symbol
  @regex  = regex

  define_singleton_method(:call, &action) if block_given?
end

Instance Attribute Details

#regex ⇒ Object (readonly)

Read access to the rule’s regex.



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# File 'lib/lexical_analyzer/lexical_rule.rb', line 7

def regex
  @regex
end

#symbol ⇒ Object (readonly)

Read access to the rule’s symbol.



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# File 'lib/lexical_analyzer/lexical_rule.rb', line 6

def symbol
  @symbol
end

Instance Method Details

#call(value) ⇒ Object

The default rule action.



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# File 'lib/lexical_analyzer/lexical_rule.rb', line 23

def call(value)
  [symbol, value]
end

#match(text) ⇒ Object

Does this rule match?



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# File 'lib/lexical_analyzer/lexical_rule.rb', line 18

def match(text)
  text.match(@regex)
end