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test_infixlang.py
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test_infixlang.py
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"""Run these tests with nose:
nosetests -v
"""
import parser
import infixlang
# commonly used operations throughout the tests
T = infixlang.tokenize
C = infixlang.Context
def parse(production_rule_root, stream):
"""Parse & ensure token stream is fully consumed.
"""
try:
p, stream_rest = production_rule_root.parse(stream)
except parser.ParseError as e:
e.original_stream = stream
raise e
if stream_rest:
e = parser.ParseError(
message="Couldn't parse the entire stream",
stream=stream_rest)
e.original_stream = stream
e.parse_so_far = p
raise e
return p
def test_tokenize():
def check(string):
stringified = ''.join(str(tok) for tok in T(string))
expected = string.translate(None, ' ')
if stringified != expected:
raise ValueError('Got %s for %s' % (
stringified,
expected))
check('2+3 == 5')
check('2+3*4')
check('2 * 3 +4')
check('(2 +3)*4')
check('( 2+3 )*0')
check('foo = 23 * 2 bar = foo * 2')
print 'OK tokenize'
def test_parse():
def check(string, expected_value):
parse_tree = parse(infixlang.expr, T(string))
computed_value = parse_tree.eval(C()).val
if computed_value != expected_value:
raise ValueError('Got %s expected %s for %s' % (
computed_value,
expected_value,
string))
check('2+3*4', 14)
check('2 * 3 +4', 10)
check('(2+3)*4', 20)
check('(2+3)*0', 0)
check('(2+3) == 5', 1)
check('(2+3) == 4', 0)
print 'OK parse'
def test_assignment_1():
context = parse(infixlang.expr, T('foo = 2 * 23')).eval(C())
assert context['foo'] == 46
context = parse(infixlang.expr, T('bar = foo + 2')).eval(context)
assert context['foo'] == 46
assert context['bar'] == 48
def test_assignment_2():
tokens = T('a = 2* 23 b = a + 2 b')
p, tokens = infixlang.expr.parse(tokens)
context = p.eval(C())
p, tokens = infixlang.expr.parse(tokens)
context = p.eval(context)
p, tokens = infixlang.expr.parse(tokens)
assert not tokens
context = p.eval(context)
assert context.val == 48
assert context['a'] == 46
assert context['b'] == 48
def test_assignment_3():
tokens = T('a_bbbb = 2*23 b_a = a_bbbb + 2 a_bbbb')
p, tokens = infixlang.expr.parse(tokens)
context = p.eval(C())
p, tokens = infixlang.expr.parse(tokens)
context = p.eval(context)
p, tokens = infixlang.expr.parse(tokens)
assert not tokens
context = p.eval(context)
assert context.val == 46
assert context['a_bbbb'] == 46
assert context['b_a'] == 48
def test_expr_sequence_1():
context = parse(infixlang.expr_sequence, T('foo = 2 * 23')).eval(C())
assert context['foo'] == 46
def test_expr_sequence_2():
context = parse(infixlang.expr_sequence,
T('a = 2* 23, b = a + 2')).eval(C())
assert context['a'] == 46
assert context['b'] == 48
def test_expr_sequence_3():
context = parse(infixlang.expr_sequence,
T('a = 2* 23, b = a + 2, b')).eval(C())
assert context.val == context['b']
def test_contexts_1():
context = parse(infixlang.expr_sequence,
T('a = 2* 3, c = (b = a + 2, 2*b)')).eval(C())
assert context['a'] == 6
assert 'b' not in context
assert context['c'] == 16
def test_contexts_2():
context = parse(infixlang.expr_sequence,
T('a = 2* 3 c = (b = a + 2, 2*b)')).eval(C())
assert context['a'] == 6
assert 'b' not in context
assert context['c'] == 16
def test_contexts_3():
context = parse(infixlang.expr_sequence,
T('a = 2* 3, d = (aa=2, (b = aa + 2, 2*b))')).eval(C())
assert context['a'] == 6
assert 'b' not in context
assert 'aa' not in context
assert context['d'] == 8
def test_contexts_4():
context = parse(infixlang.expr_sequence,
T('a = 2* 3 d = (aa=2 (b = aa + 2 2*b))')).eval(C())
assert context['a'] == 6
assert 'b' not in context
assert 'aa' not in context
assert context['d'] == 8
def test_contexts_5():
context = parse(infixlang.expr_sequence,
T('a = (2), b = (a)')).eval(C())
assert context['b'] == 2
def test_contexts_6():
context = parse(infixlang.expr_sequence,
T('a ~ (3), b = (a)')).eval(C())
assert context['b'] == 3
def test_contexts_7():
context = parse(infixlang.expr_sequence,
T('a = 2* 3, c ~ (b = aa + 2, 2*b), d = (aa=2, c)')
).eval(C())
assert context['a'] == 6
assert 'b' not in context
assert 'aa' not in context
assert 'c' in context
assert context['d'] == 8
def test_contexts_8():
tokens = T("""
a = 2 * 3
c ~ (b = aa + 2 2*b)
d = (aa=2 c)""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context['a'] == 6
assert 'b' not in context
assert 'c' in context
assert context['d'] == 8
def test_context_9():
tokens = T("""
(a=1, b=2)
(c=3, a+c)
""")
try:
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert False # this shouldn't succeed.
except infixlang.UnknownVariableError:
pass # it should raise.
def test_if_1():
tokens = T("""
else = 4
then = 2
cond = 0
if
""")
v = parse(infixlang.expr_sequence, tokens).eval(C()).val
assert v == 4
def test_if_2():
tokens = T("""
else ~ 2 * a
then ~ 3 * a
a = 2
cond = 0
if
""")
v = parse(infixlang.expr_sequence, tokens).eval(C()).val
assert v == 4
def test_if_3():
tokens = T("""
a = 1
else ~ 2 * a
then ~ 3 * a
a = 2
cond = 1
if
""")
v = parse(infixlang.expr_sequence, tokens).eval(C()).val
assert v == 6
def test_if_4():
tokens = T("""
a = 1
else ~ (b = 2, b * a)
then ~ (b = 3, b * a)
a = 2
cond=1
if
""")
v = parse(infixlang.expr_sequence, tokens).eval(C()).val
assert v == 6
def test_if_5():
tokens = T("""
a = 2
else ~ 2*a then ~ 3*a
cond=(a == 2)
if
""")
v = parse(infixlang.expr_sequence, tokens).eval(C()).val
assert v == 6
def test_if_6():
tokens = T("""
r ~ (then ~ a*2, else ~ a*3, if)
l0 = (a=1, cond=0, r)
l1 = (a=1, cond=1, r)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context['l0'] == 3
assert context['l1'] == 2
def test_variable_context_1():
tokens = T("""
con = (a=1, b=2, this)
(c=3, con, a+c)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context.val == 4
assert 'a' not in context
assert 'b' not in context
assert 'c' not in context
assert 'con' in context
def test_variable_context_2():
tokens = T("""
con = (a=1, (b=2, this))
(c=3, con, a+b+c)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context.val == 6
assert 'a' not in context
assert 'b' not in context
assert 'c' not in context
assert 'con' in context
def test_context_valued_expressions():
tokens = T("""
contexts = (
con_a = (a=1, this),
con_b = (b=2, this),
this
)
v1 = (c=3, (contexts con_a), a+c)
v2 = (c=3, (contexts con_b), b+c)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context['v1'] == 4
assert context['v2'] == 5
assert 'a' not in context
assert 'b' not in context
assert 'c' not in context
assert 'con_a' not in context
assert 'con_b' not in context
def test_factorial():
tokens = T("""
factorial ~ (then ~ i*(i=i-1 factorial) else=1 cond=i if)
(i=4 factorial)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context.val == 24
assert 'i' not in context
def test_accumulate():
tokens = T("""
accumulate ~ (tally=tally+func, then~(i=i-1 accumulate), else~tally, cond=i, if)
(tally=0 i=4 func~i*i accumulate)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context.val == 30
assert 'i' not in context
assert 'tally' not in context
def test_next_factorial():
tokens = T("""
factorial ~ (i=i+1, fac=i*fac, this)
factorial_state = (i=0, fac=1, factorial)
factorial_state = (factorial_state factorial)
factorial_state = (factorial_state factorial)
factorial_state = (factorial_state factorial)
(factorial_state fac)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context.val == 24
assert 'i' not in context
assert 'fac' not in context
def test_iterator():
tokens = T("""
iterator = (i=0, iterate~(i=i+1, this), this)
v1 = (iterator i)
iterator = (iterator iterate)
v2 = (iterator i)
v3 = (iterator i)
iterator = (iterator iterate)
v4 = (iterator i)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context['v1'] == 0
assert context['v2'] == 1
assert context['v3'] == 1
assert context['v4'] == 2
def test_while():
tokens = T("""
iterate ~ (i=i+1, sum=sum+i, stop=(i==8), this)
while ~ (then=iterator, else~(iterator=(iterator iterate) while), cond=(iterator stop) if)
final = (iterator=(i=0 sum=0 iterate) while)
final_i = (final i)
final_sum = (final sum)
final_stop = (final stop)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context['final_i'] == 8
assert context['final_sum'] == 36
assert context['final_stop']
def test_lists():
tokens = T("""
insert ~ (prev=list, this)
mylist = (this)
mylist = (list=mylist value=2 insert)
mylist = (list=mylist value=3 insert)
mylist = (list=mylist value=7 insert)
item_1 = (mylist value)
item_2 = ((mylist prev) value)
item_3 = (((mylist prev) prev) value)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context['item_1'] == 7
assert context['item_2'] == 3
assert context['item_3'] == 2
def test_arrays():
tokens = T("""
set_element ~ (prev=array, this)
get_element ~ (then=(array value) else~(array=(array prev) get_element) cond=((array slot) == slot) if)
myarray = (this)
myarray = (array=myarray slot=1000 value=10 set_element)
myarray = (array=myarray slot=2000 value=20 set_element)
myarray = (array=myarray slot=3000 value=30 set_element)
item_1 = (array=myarray slot=1000 get_element)
item_2 = (array=myarray slot=2000 get_element)
item_3 = (array=myarray slot=3000 get_element)
""")
context = parse(infixlang.expr_sequence, tokens).eval(C())
assert context['item_1'] == 10
assert context['item_2'] == 20
assert context['item_3'] == 30