Module: SchemeChecker

Included in:
Tokenizer
Defined in:
lib/lisp/interpreter/checker.rb

Overview

Check if variable is specific type

Instance Method Summary collapse

Instance Method Details

#check_for_bool(token) ⇒ Object 



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# File 'lib/lisp/interpreter/checker.rb', line 3

def check_for_bool(token)
  return true if ['#t', '#f'].include? token
  is_instance_var = check_instance_var token
  return true if is_instance_var && (check_for_bool get_var token)
  false
end

#check_for_number(token) ⇒ Object 



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# File 'lib/lisp/interpreter/checker.rb', line 17

def check_for_number(token)
  return true if token.to_s.number?
  is_instance_var = check_instance_var token
  return true if is_instance_var && (check_for_number get_var token)
  false
end

#check_for_quote(token) ⇒ Object 



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# File 'lib/lisp/interpreter/checker.rb', line 24

def check_for_quote(token)
  return true if token[0].quote?
  is_instance_var = check_instance_var token
  return true if is_instance_var && (check_for_number get_var token)
  false
end

#check_for_string(token) ⇒ Object 



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# File 'lib/lisp/interpreter/checker.rb', line 10

def check_for_string(token)
  return true if token.string?
  is_instance_var = check_instance_var token
  return true if is_instance_var && (check_for_string get_var token)
  false
end

#check_for_symbol(var) ⇒ Object 



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# File 'lib/lisp/interpreter/checker.rb', line 37

def check_for_symbol(var)
  var = var.join('') if var.is_a? Array
  return true if var == '#\space'
  return true if var.character?
  is_instance_var = check_instance_var var
  return true if is_instance_var && (check_for_character get_var var)
  false
end

#check_instance_var(var) ⇒ Object 



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# File 'lib/lisp/interpreter/checker.rb', line 31

def check_instance_var(var)
  return false if var.is_a? Proc
  return false unless valid_var_name var
  instance_variable_defined?("@#{var}")
end