hy/tests/compilers/test_ast.py

# Copyright (c) 2013 Paul Tagliamonte <paultag@debian.org>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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# DEALINGS IN THE SOFTWARE.

from hy.compiler import hy_compile, HyCompileError
from hy.lex import tokenize

import ast
import sys


def _ast_spotcheck(arg, root, secondary):
    if "." in arg:
        local, full = arg.split(".", 1)
        return _ast_spotcheck(full,
                              getattr(root, local),
                              getattr(secondary, local))
    assert getattr(root, arg) == getattr(secondary, arg)


def cant_compile(expr):
    try:
        hy_compile(tokenize(expr))
        assert False
    except TypeError:
        pass


def test_ast_bad_type():
    "Make sure AST breakage can happen"
    try:
        hy_compile("foo")
        assert True is False
    except HyCompileError:
        pass


def test_ast_bad_if_0_arg():
    "Make sure AST can't compile invalid if"
    try:
        hy_compile(tokenize("(if)"))
        assert False
    except TypeError:
        pass


def test_ast_bad_if_1_arg():
    "Make sure AST can't compile invalid if"
    try:
        hy_compile(tokenize("(if foobar)"))
        assert False
    except TypeError:
        pass


def test_ast_valid_if():
    "Make sure AST can't compile invalid if"
    hy_compile(tokenize("(if foo bar)"))


def test_ast_valid_unary_op():
    "Make sure AST can compile valid unary operator"
    hy_compile(tokenize("(not 2)"))
    hy_compile(tokenize("(~ 1)"))


def test_ast_invalid_unary_op():
    "Make sure AST can't compile invalid unary operator"
    cant_compile("(not 2 3 4)")
    cant_compile("(not)")
    cant_compile("(not 2 3 4)")
    cant_compile("(~ 2 2 3 4)")
    cant_compile("(~)")


def test_ast_bad_while_0_arg():
    "Make sure AST can't compile invalid while"
    try:
        hy_compile(tokenize("(while)"))
        assert False
    except TypeError:
        pass


def test_ast_bad_while_1_arg():
    "Make sure AST can't compile invalid while"
    try:
        hy_compile(tokenize("(while (true))"))
        assert False
    except TypeError:
        pass


def test_ast_valid_while():
    "Make sure AST can't compile invalid while"
    hy_compile(tokenize("(while foo bar)"))


def test_ast_expression_basics():
    """ Ensure basic AST expression conversion works. """
    code = hy_compile(tokenize("(foo bar)")).body[0]
    tree = ast.Expr(value=ast.Call(
            func=ast.Name(
                id="foo",
                ctx=ast.Load(),
            ),
            args=[
                ast.Name(id="bar", ctx=ast.Load())
            ],
            keywords=[],
            starargs=None,
            kwargs=None,
        ))

    _ast_spotcheck("value.func.id", code, tree)


def test_ast_anon_fns_basics():
    """ Ensure anon fns work. """
    code = hy_compile(tokenize("(fn (x) (* x x))")).body[0]
    assert type(code) == ast.FunctionDef


def test_ast_non_decoratable():
    """ Ensure decorating garbage breaks """
    try:
        hy_compile(tokenize("(decorate-with (foo) (* x x))"))
        assert True is False
    except TypeError:
        pass


def test_ast_non_kwapplyable():
    """ Ensure kwapply breaks """
    code = tokenize("(kwapply foo bar)")
    code[0][2] = None
    try:
        hy_compile(code)
        assert True is False
    except TypeError:
        pass


def test_ast_print():
    code = hy_compile(tokenize("(print \"foo\")")).body[0]

    if sys.version_info[0] >= 3:
        assert type(code.value) == ast.Call
        return
    assert type(code) == ast.Print


def test_ast_tuple():
    """ Ensure tuples work. """
    code = hy_compile(tokenize("(, 1 2 3)")).body[0].value
    assert type(code) == ast.Tuple