if !inited
  inited = true
  init()


$.init = init

parse_internal = (argu) ->
  if typeof argu == 'string'
    scan(argu)
    # now its in the stack
  else if typeof argu == 'number'
    if argu % 1 == 0
      push_integer(argu)
    else
      push_double(argu)
  else if argu instanceof U
    # hey look its a U
    push(argu)
  else
    console.warn('unknown argument type', argu)
    push(symbol(NIL))

parse = (argu) ->
  try
    parse_internal(argu)
    data = pop()
    check_stack()
  catch error
    reset_after_error()
    throw error
  return data

# exec handles the running ia JS of all the algebrite
# functions. The function name is passed in "name" and
# the corresponding function is pushed at the top of the stack
exec = (name, argus...) ->
  fn = get_binding(usr_symbol(name))
  check_stack()
  push(fn)

  for argu in argus
    parse_internal(argu)
  
  list(1 + argus.length)
  
  p1 = pop()
  push(p1)
  
  try
    top_level_eval()
    result = pop()
    check_stack()
  catch error
    reset_after_error()
    throw error

  return result


$.exec = exec
$.parse = parse

do ->
  builtin_fns = ["abs", "add", "adj", "and", "approxratio", "arccos", "arccosh", "arcsin", "arcsinh", "arctan", "arctanh", "arg", "atomize", "besselj", "bessely", "binding", "binomial", "ceiling", "check", "choose", "circexp", "clear", "clearall", "clearpatterns", "clock", "coeff", "cofactor", "condense", "conj", "contract", "cos", "cosh", "decomp", "defint", "deg", "denominator", "det", "derivative", "dim", "dirac", "divisors", "do", "dot", "draw", "dsolve", "eigen", "eigenval", "eigenvec", "erf", "erfc", "eval", "exp", "expand", "expcos", "expsin", "factor", "factorial", "factorpoly", "filter", "float", "floor", "for", "Gamma", "gcd", "hermite", "hilbert", "imag", "component", "inner", "integral", "inv", "invg", "isinteger", "isprime", "laguerre", "lcm", "leading", "legendre", "log", "mod", "multiply", "not", "nroots", "number", "numerator", "operator", "or", "outer", "pattern", "patternsinfo", "polar", "power", "prime", "print", "print2dascii", "printcomputer", "printlatex", "printlist", "printhuman", "product", "quote", "quotient", "rank", "rationalize", "real", "rect", "roots", "round", "equals", "shape", "sgn", "silentpattern", "simplify", "sin", "sinh", "sqrt", "stop", "subst", "sum", "symbolsinfo", "tan", "tanh", "taylor", "test", "testeq", "testge", "testgt", "testle", "testlt", "transpose", "unit", "zero"]

  for fn in builtin_fns
    $[fn] = exec.bind(this, fn)