Class: Keisanjaku::Parser

Inherits:

Object

• Object
• Keisanjaku::Parser

Defined in:

lib/keisanjaku/parser.rb

Constant Summary

FUNCTIONS =

%w[sqrt cbrt sin cos tan log].freeze

Class Method Summary

• .parse(input) ⇒ Object

Instance Method Summary

• #initialize(input) ⇒ Parser constructor

  A new instance of Parser.

• #parse ⇒ Object

Constructor Details

#initialize(input) ⇒ Parser

Returns a new instance of Parser.

# File 'lib/keisanjaku/parser.rb', line 19

def initialize(input)
  @chars = input.to_s.each_char.to_a
  @index = 0
end

Class Method Details

.parse(input) ⇒ Object

# File 'lib/keisanjaku/parser.rb', line 33

def self.parse(input)
  new(input).parse
end

Instance Method Details

#parse ⇒ Object

# File 'lib/keisanjaku/parser.rb', line 24

def parse
  skip_space
  node = parse_expr
  skip_space
  raise_error("unexpected token '#{peek}'") unless eof?

  node
end