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builtin.py
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builtin.py
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#
# Built-in Functions
#
from lisp import *
import __main__
class BuiltinError(LispError): pass
# Basics
#
def builtin_atom(x):
if x.is_atom():
return LispTrue()
else:
return LispList()
def builtin_eq(a, b):
if a == b:
return LispTrue()
else:
return LispList()
def builtin_head(L):
if L.is_atom():
raise BuiltinError("head: non-empty list expected")
return L.head()
def builtin_tail(L):
if L.is_atom():
raise BuiltinError("tail: non-empty list expected")
return L.tail()
def builtin_cons(x, L):
if type(L) != LispList:
raise BuiltinError('cons: list expected as second parameter')
return LispList([x] + L)
def builtin_list(*L):
return LispList(L)
def builtin_eval(x):
# evaluate in main environment - this is a bit ugly
return __main__.env.evaluate(x)
# Arithmetic
#
def builtin_add(x, y):
if type(x) != LispInt or type(y) != LispInt:
raise BuiltinError('builtin_add: illegal parameter type')
return LispInt(x + y)
def builtin_sub(x, y):
if type(x) != LispInt or type(y) != LispInt:
raise BuiltinError('builtin_sub: illegal parameter type')
return LispInt(x - y)
def builtin_mul(x, y):
if type(x) != LispInt or type(y) != LispInt:
raise BuiltinError('builtin_mul: illegal parameter type')
return LispInt(x * y)
def builtin_div(x, y):
if type(x) != LispInt or type(y) != LispInt:
raise BuiltinError('builtin_div: illegal parameter type')
if y == 0:
raise BuiltinError('builtin_div: divide by zero')
return LispInt(x // y)
def builtin_mod(x, n):
if type(x) != LispInt or type(n) != LispInt:
raise BuiltinError('builtin_mod: illegal parameter type')
return LispInt(x % n)
def builtin_lt(x, y):
if type(x) != LispInt or type(y) != LispInt:
raise BuiltinError('builtin_lt: illegal parameter type')
if x < y:
return LispTrue()
else:
return LispList()
def builtin_le(x, y):
if type(x) != LispInt or type(y) != LispInt:
raise BuiltinError('builtin_lt: illegal parameter type')
if x <= y:
return LispTrue()
else:
return LispList()
def builtin_gt(x, y):
if type(x) != LispInt or type(y) != LispInt:
raise BuiltinError('builtin_gt: illegal parameter type')
if x > y:
return LispTrue()
else:
return LispList()
def builtin_ge(x, y):
if type(x) != LispInt or type(y) != LispInt:
raise BuiltinError('builtin_gt: illegal parameter type')
if x >= y:
return LispTrue()
else:
return LispList()
# Bool
#
def builtin_not(x):
if not x.is_true():
return LispTrue()
else:
return LispList()
def builtin_and(x, y):
if x.is_true() and y.is_true():
return LispTrue()
else:
return LispList()
def builtin_or(x, y):
if x.is_true() or y.is_true():
return LispTrue()
else:
return LispList()
# Input / Output
#
def builtin_print(*param):
for p in param:
print(p, end='')
return LispList()
def builtin_println(*param):
builtin_print(*param)
print()
return LispList()
TABLE = {
LispSym('head') : LispBuiltin(builtin_head, 1),
LispSym('tail') : LispBuiltin(builtin_tail, 1),
LispSym('print') : LispBuiltin(builtin_print, None),
LispSym('println') : LispBuiltin(builtin_println, None),
LispSym('cons') : LispBuiltin(builtin_cons, 2),
LispSym('atom') : LispBuiltin(builtin_atom, 1),
LispSym('list') : LispBuiltin(builtin_list),
LispSym('eval') : LispBuiltin(builtin_eval, 1),
LispSym('eq') : LispBuiltin(builtin_eq, 2),
LispSym('lt') : LispBuiltin(builtin_lt, 2),
LispSym('le') : LispBuiltin(builtin_le, 2),
LispSym('gt') : LispBuiltin(builtin_gt, 2),
LispSym('ge') : LispBuiltin(builtin_ge, 2),
LispSym('+') : LispBuiltin(builtin_add, 2),
LispSym('-') : LispBuiltin(builtin_sub, 2),
LispSym('*') : LispBuiltin(builtin_mul, 2),
LispSym('/') : LispBuiltin(builtin_div, 2),
LispSym('mod') : LispBuiltin(builtin_mod, 2),
LispSym('not') : LispBuiltin(builtin_not, 1),
LispSym('and') : LispBuiltin(builtin_and, 2),
LispSym('or') : LispBuiltin(builtin_or, 2),
}