Class: Lispcalc::Parser

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

Instance Method Summary collapse

Constructor Details

#initialize(tokens) ⇒ Parser

Returns a new instance of Parser.

Raises:

  • (ArgumentError) 


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# File 'lib/lispcalc/parser.rb', line 3

def initialize(tokens)
  raise ArgumentError, 'expecting an Array' unless tokens.instance_of?(Array)
  raise ArgumentError, 'invalid token' unless tokens.all? { |t| valid_token?(t) }

  @tokens = tokens
end

Instance Method Details

#parse ⇒ Object

Raises:



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

def parse
  output = parse_list
  raise SyntaxError, 'expecting a single top-level list' unless @tokens.empty?

  output
end