Class: ShuntingYard::Parser

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/shunting_yard/parser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lexer: nil, interpreter: nil) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/shunting_yard/parser.rb', line 10

def initialize(lexer: nil, interpreter: nil)
  @lexer = lexer || Lexer.new
  @interpreter = interpreter || Interpreter.new
end

Instance Attribute Details

#interpreter ⇒ Object

Returns the value of attribute interpreter.



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# File 'lib/shunting_yard/parser.rb', line 8

def interpreter
  @interpreter
end

#lexer ⇒ Object

Returns the value of attribute lexer.



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# File 'lib/shunting_yard/parser.rb', line 7

def lexer
  @lexer
end

Instance Method Details

#evaluate(input) ⇒ Object 



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# File 'lib/shunting_yard/parser.rb', line 18

def evaluate(input)
  rpn_tokens = to_rpn(input)
  interpreter.evaluate(rpn_tokens)
end

#to_rpn(input) ⇒ Object 



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# File 'lib/shunting_yard/parser.rb', line 23

def to_rpn(input)
  tokens = tokenize(input)
  interpreter.to_rpn(tokens)
end