def test_builder():
from hornet import build_term
from hornet.symbols import _, f, a, b, c, d, e, X, Y, Z
print(build_term(a))
print(build_term(f(a, b) << b & c & d))
print(build_term(f(X, Y) << b(X) & c(Y) & d))
print(build_term(f(X, Y) << b(X) & c(Y) & d(_, Z, [e, d | a])))
print(build_term(f(X, Y) << b(X) & c(Y) & d(_, Z, [e, d | [a]])))
print(build_term(a * (b + c)))
def test_dcg_transformation():
from hornet.expressions import promote, mcompose
from hornet.operators import rearrange
from hornet.dcg import expand, _C_
from hornet.symbols import s, np, vp, _0, _1, _2, _3, _4, _5, _6, _7, _8
from hornet.symbols import it_is, tell, me, it, aint, so, very, different
from hornet.symbols import a, b, c, u, v, X
ast_test_all(
ast_eq,
mcompose(rearrange, expand),
rearrange,
(
s >> vp,
s(_0, _1) << vp(_0, _1),
),
(
s >> np & vp,
s(_0, _2) << np(_0, _1) & vp(_1, _2),
),
(
s >> np(a) & vp(a, b),
s(_0, _2) << np(a, _0, _1) & vp(a, b, _1, _2),
),
(
s >> a & b & c,
s(_0, _3) << a(_0, _1) & b(_1, _2) & c(_2, _3),
),
(
it_is(X) >> [] & [],
it_is(X, _0, _0),
),
(
it_is(X) >> [],
it_is(X, _0, _0),
),
(
it_is(X) >> [] & so,
it_is(X, _0, _1) <<
so(_0, _1),
),
(
it_is(X) >> so & [],
it_is(X, _0, _1) <<
so(_0, _1),
),
(
it_is(X) >> [] & so & [],
it_is(X, _0, _1) <<
so(_0, _1),
),
(
it_is(X) >> tell & [] & so,
it_is(X, _0, _2) <<
tell(_0, _1) &
so(_1, _2),
),
(
it_is(X) >> [tell],
it_is(X, _0, _1) <<
_C_(_0, tell, _1),
),
(
it_is(X) >> [tell, me],
it_is(X, _0, _2) <<
_C_(_0, tell, _1) &
_C_(_1, me, _2),
),
(
it_is(X) >> [tell, me, it],
it_is(X, _0, _3) <<
_C_(_0, tell, _1) &
_C_(_1, me, _2) &
_C_(_2, it, _3),
),
(
it_is(X) >> [tell, me, it, aint],
it_is(X, _0, _4) <<
_C_(_0, tell, _1) &
_C_(_1, me, _2) &
_C_(_2, it, _3) &
_C_(_3, aint, _4),
),
(
it_is(X) >> [tell, me, it, aint, so],
it_is(X, _0, _5) <<
_C_(_0, tell, _1) &
_C_(_1, me, _2) &
_C_(_2, it, _3) &
_C_(_3, aint, _4) &
_C_(_4, so, _5),
),
(
(it_is(X) & [c, tell, me, it]) >>
[aint, so, a, b],
it_is(X, _0, _8) <<
_C_(_0, aint, _1) &
_C_(_1, so, _2) &
_C_(_2, a, _3) &
_C_(_3, b, _4) &
_C_(_8, c, _7) &
_C_(_7, tell, _6) &
_C_(_6, me, _5) &
_C_(_5, it, _4),
),
(
(it_is(X) & [tell, me]) >>
[very, different],
it_is(X, _0, _4) <<
_C_(_0, very, _1) &
_C_(_1, different, _2) &
_C_(_4, tell, _3) &
_C_(_3, me, _2),
),
(
it_is(X) & [me] >>
it & [very] & so,
it_is(X, _0, _4) <<
it(_0, _1) &
_C_(_1, very, _2) &
so(_2, _3) &
_C_(_4, me, _3),
),
(
it_is(X) & [me] >>
it & [very] & so & [different],
it_is(X, _0, _5) <<
it(_0, _1) &
_C_(_1, very, _2) &
so(_2, _3) &
_C_(_3, different, _4) &
_C_(_5, me, _4),
),
(
it_is(X) & [me] >>
promote([it]) & [very] & [tell] & [different] & so,
it_is(X, _0, _6) <<
_C_(_0, it, _1) &
_C_(_1, very, _2) &
_C_(_2, tell, _3) &
_C_(_3, different, _4) &
so(_4, _5) &
_C_(_6, me, _5),
),
(
it_is(X) & [me] >>
it & [very, tell] & so & [different],
it_is(X, _0, _6) <<
it(_0, _1) &
_C_(_1, very, _2) &
_C_(_2, tell, _3) &
so(_3, _4) &
_C_(_4, different, _5) &
_C_(_6, me, _5),
),
(
it_is(X) >> {tell(X)} & me,
it_is(X, _0, _1) <<
tell(X) &
me(_0, _1),
),
)