76 lines
2.4 KiB
Python
76 lines
2.4 KiB
Python
# Copyright 2019 the authors.
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# This file is part of Hy, which is free software licensed under the Expat
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# license. See the LICENSE.
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import ast
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from hy import compiler
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from hy.models import HyExpression, HyList, HySymbol, HyInteger
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from hy._compat import PY3
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def make_expression(*args):
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h = HyExpression(args)
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h.start_line = 1
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h.end_line = 1
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h.start_column = 1
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h.end_column = 1
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return h.replace(h)
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def test_compiler_bare_names():
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"""
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Check that the compiler doesn't drop bare names from code branches
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"""
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e = make_expression(HySymbol("do"),
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HySymbol("a"),
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HySymbol("b"),
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HySymbol("c"))
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ret = compiler.HyASTCompiler('test').compile(e)
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# We expect two statements and a final expr.
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assert len(ret.stmts) == 2
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for stmt, symbol in zip(ret.stmts, "ab"):
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assert isinstance(stmt, ast.Expr)
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assert isinstance(stmt.value, ast.Name)
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assert stmt.value.id == symbol
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assert isinstance(ret.expr, ast.Name)
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assert ret.expr.id == "c"
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def test_compiler_yield_return():
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"""
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Check that the compiler correctly generates return statements for
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a generator function. In Python versions prior to 3.3, the return
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statement in a generator can't take a value, so the final expression
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should not generate a return statement. From 3.3 onwards a return
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value should be generated.
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"""
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e = make_expression(HySymbol("fn"),
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HyList(),
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HyExpression([HySymbol("yield"),
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HyInteger(2)]),
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HyExpression([HySymbol("+"),
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HyInteger(1),
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HyInteger(1)]))
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ret = compiler.HyASTCompiler('test').compile_atom(e)
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assert len(ret.stmts) == 1
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stmt, = ret.stmts
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assert isinstance(stmt, ast.FunctionDef)
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body = stmt.body
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assert len(body) == 2
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assert isinstance(body[0], ast.Expr)
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assert isinstance(body[0].value, ast.Yield)
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if PY3:
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# From 3.3+, the final statement becomes a return value
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assert isinstance(body[1], ast.Return)
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assert isinstance(body[1].value, ast.BinOp)
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else:
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# In earlier versions, the expression is not returned
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assert isinstance(body[1], ast.Expr)
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assert isinstance(body[1].value, ast.BinOp)
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