Exemplo n.º 1
0
 def valid_tar(t):
     if t.__class__ is ast.Subscript:
         col_t = infer_expr(t.value, env)
         sub_of_tup = col_t and col_t.is_tuple()
     else:
         sub_of_tup = False
     t_t = infer_expr(t, env)
     return t_t and check_expr(v, t_t, env) and not sub_of_tup
Exemplo n.º 2
0
def _check_AugAssign_stmt(stmt, env):
    """Augmented Assignment."""
    
    assert stmt.__class__ is ast.AugAssign

    e0 = stmt.target
    op = stmt.op
    e1 = stmt.value

    e0_t = infer_expr(e0, env)

    # (Aug-Assmt) assignment rule. -- restricted by type inference
    return e0_t and check_expr(ast.BinOp(e0, op, e1), e0_t, env)
Exemplo n.º 3
0
def _check_Subscript_expr(subs, t, env):
    """Subscription."""

    assert subs.__class__ is ast.Subscript

    c = subs.value
    s = subs.slice

    # Type inference is necessary off the bat; these rules are the polar
    # opposite of syntax direction.
    c_t = infer_expr(c, env)
    if not c_t:
        return False

    # Indexing.
    if s.__class__ is ast.Index:

        e = s.value

        # (Str-Idx) assignment rule.
        if c_t == str_t or c_t == unicode_t:
            return c_t == t and check_expr(e, int_t, env)

        # (Lst-Idx) assignment rule.
        elif c_t.is_list():
            return t == c_t.elt and check_expr(e, int_t, env)

        # (Tup-Idx) assignment rule.
        elif c_t.is_tuple():
            n = len(c_t.elts)
            return node_is_int(e) and -n <= e.n < n and c_t.elts[e.n] == t

    # Slicing.
    elif s.__class__ is ast.Slice:
        e0, e1, e2 = s.lower, s.upper, s.step

        # (Flat-Slc) assignment rule.
        if c_t == str_t or c_t == unicode_t or c_t.is_list():
            return c_t == t and valid_int_slice(e0, e1, e2, env)

        # (Tup-Slc) assignment rule.
        elif c_t.is_tuple() and ((not e0 or node_is_int(e0)) and
                                 (not e1 or node_is_int(e1)) and
                                 (not e2 or node_is_None(e2) or node_is_int(e2))):
            rng = slice_range(e0, e1, e2, c_t.tuple_len())
            return (t.is_tuple() and rng and len(rng) == t.tuple_len()
                    and all(c_t.elts[j] == t.elts[i]
                            for (i,j) in enumerate(rng)))

    # No assignment rule found
    return False
Exemplo n.º 4
0
def _check_For_stmt(stmt, env):
    """For Loop."""

    assert stmt.__class__ is ast.For

    x = stmt.target
    e = stmt.iter
    b0 = stmt.body
    b1 = stmt.orelse

    x_t = infer_expr(x, env)

    # (For) assignment rule. -- restricted by type inference
    return (x_t and check_expr(e, PType.list(x_t), env) and
            check_stmt_list(b0, env) and check_stmt_list(b1, env))
Exemplo n.º 5
0
Arquivo: pyty.py Projeto: jruberg/Pyty
        # FIXME: this is copied from unit_test_core, should be abstracted
        # away somewhere, but don't know the best way to deal with logging.
        with open(file_name, 'r') as f:
            text = f.read()
        untyped_ast = ast.parse(text)
        typedecs = parse_type_decs(file_name)
        typed_ast = TypeDecASTModule(untyped_ast, typedecs)
        if check_mod(typed_ast.tree):
            print "Typechecked correctly!"
        else:
            print "Did not typecheck."

    except IOError as e:
        print "File not found: %s" % e.filename

elif opt.expr and opt.type and not opt.filename and not opt.infer_expr:
    e = ast.parse(opt.expr).body[0].value
    t = PType.from_str(opt.type)
    template = ("YES! -- %s typechecks as type %s" if check_expr(e, t, {}) else
                "NO! --- %s does not typecheck as type %s")
    print template % (opt.expr, t)

elif opt.infer_expr and not opt.filename and not opt.expr and not opt.type:
    e = ast.parse(opt.infer_expr).body[0].value
    print "%s -- is the inferred type of %s" % (infer_expr(e, {}),
                                                opt.infer_expr)
    
else:
    parser.print_help()

Exemplo n.º 6
0
    try:
        # FIXME: this is copied from unit_test_core, should be abstracted
        # away somewhere, but don't know the best way to deal with logging.
        with open(file_name, 'r') as f:
            text = f.read()
        untyped_ast = ast.parse(text)
        typedecs = parse_type_decs(file_name)
        typed_ast = TypeDecASTModule(untyped_ast, typedecs)
        if check_mod(typed_ast.tree):
            print "Typechecked correctly!"
        else:
            print "Did not typecheck."

    except IOError as e:
        print "File not found: %s" % e.filename

elif opt.expr and opt.type and not opt.filename and not opt.infer_expr:
    e = ast.parse(opt.expr).body[0].value
    t = PType.from_str(opt.type)
    template = ("YES! -- %s typechecks as type %s" if check_expr(e, t, {}) else
                "NO! --- %s does not typecheck as type %s")
    print template % (opt.expr, t)

elif opt.infer_expr and not opt.filename and not opt.expr and not opt.type:
    e = ast.parse(opt.infer_expr).body[0].value
    print "%s -- is the inferred type of %s" % (infer_expr(e,
                                                           {}), opt.infer_expr)

else:
    parser.print_help()