hy/tests/compilers/test_compiler.py

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# Copyright 2018 the authors.
# This file is part of Hy, which is free software licensed under the Expat
# license. See the LICENSE.
import ast
from hy import compiler
from hy.models import HyExpression, HyList, HySymbol, HyInteger
from hy._compat import PY3
def make_expression(*args):
h = HyExpression(args)
h.start_line = 1
h.end_line = 1
h.start_column = 1
h.end_column = 1
return h.replace(h)
def test_compiler_bare_names():
"""
Check that the compiler doesn't drop bare names from code branches
"""
e = make_expression(HySymbol("do"),
HySymbol("a"),
HySymbol("b"),
HySymbol("c"))
ret = compiler.HyASTCompiler('test').compile(e)
# We expect two statements and a final expr.
assert len(ret.stmts) == 2
for stmt, symbol in zip(ret.stmts, "ab"):
assert isinstance(stmt, ast.Expr)
assert isinstance(stmt.value, ast.Name)
assert stmt.value.id == symbol
assert isinstance(ret.expr, ast.Name)
assert ret.expr.id == "c"
def test_compiler_yield_return():
"""
Check that the compiler correctly generates return statements for
a generator function. In Python versions prior to 3.3, the return
statement in a generator can't take a value, so the final expression
should not generate a return statement. From 3.3 onwards a return
value should be generated.
"""
e = make_expression(HySymbol("fn"),
HyList(),
HyExpression([HySymbol("yield"),
HyInteger(2)]),
HyExpression([HySymbol("+"),
HyInteger(1),
HyInteger(1)]))
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ret = compiler.HyASTCompiler('test').compile_atom("fn", e)
assert len(ret.stmts) == 1
stmt, = ret.stmts
assert isinstance(stmt, ast.FunctionDef)
body = stmt.body
assert len(body) == 2
assert isinstance(body[0], ast.Expr)
assert isinstance(body[0].value, ast.Yield)
if PY3:
# From 3.3+, the final statement becomes a return value
assert isinstance(body[1], ast.Return)
assert isinstance(body[1].value, ast.BinOp)
else:
# In earlier versions, the expression is not returned
assert isinstance(body[1], ast.Expr)
assert isinstance(body[1].value, ast.BinOp)