mirror of
https://github.com/python/cpython.git
synced 2025-07-08 03:45:36 +00:00
8f59ee01be
* Add tokenization of :=
- Add token to Include/token.h. Add token to documentation in Doc/library/token.rst.
- Run `./python Lib/token.py` to regenerate Lib/token.py.
- Update Parser/tokenizer.c: add case to handle `:=`.
* Add initial usage of := in grammar.
* Update Python.asdl to match the grammar updates. Regenerated Include/Python-ast.h and Python/Python-ast.c
* Update AST and compiler files in Python/ast.c and Python/compile.c. Basic functionality, this isn't scoped properly
* Regenerate Lib/symbol.py using `./python Lib/symbol.py`
* Tests - Fix failing tests in test_parser.py due to changes in token numbers for internal representation
* Tests - Add simple test for := token
* Tests - Add simple tests for named expressions using expr and suite
* Tests - Update number of levels for nested expressions to prevent stack overflow
* Update symbol table to handle NamedExpr
* Update Grammar to allow assignment expressions in if statements.
Regenerate Python/graminit.c accordingly using `make regen-grammar`
* Tests - Add additional tests for named expressions in RoundtripLegalSyntaxTestCase, based on examples and information directly from PEP 572
Note: failing tests are currently commented out (4 out of 24 tests currently fail)
* Tests - Add temporary syntax test failure tests in test_parser.py
Note: There is an outstanding TODO for this -- syntax tests need to be
moved to a different file (presumably test_syntax.py), but this is
covering what needs to be tested at the moment, and it's more convenient
to run a single test for the time being
* Add support for allowing assignment expressions as function argument annotations. Uncomment tests for these cases because they all pass now!
* Tests - Move existing syntax tests out of test_parser.py and into test_named_expressions.py. Refactor syntax tests to use unittest
* Add TargetScopeError exception to extend SyntaxError
Note: This simply creates the TargetScopeError exception, it is not yet
used anywhere
* Tests - Update tests per PEP 572
Continue refactoring test suite:
The named expression test suite now checks for any invalid cases that
throw exceptions (no longer limited to SyntaxErrors), assignment tests
to ensure that variables are properly assigned, and scope tests to
ensure that variable availability and values are correct
Note:
- There are still tests that are marked to skip, as they are not yet
implemented
- There are approximately 300 lines of the PEP that have not yet been
addressed, though these may be deferred
* Documentation - Small updates to XXX/todo comments
- Remove XXX from child description in ast.c
- Add comment with number of previously supported nested expressions for
3.7.X in test_parser.py
* Fix assert in seq_for_testlist()
* Cleanup - Denote "Not implemented -- No keyword args" on failing test case. Fix PEP8 error for blank lines at beginning of test classes in test_parser.py
* Tests - Wrap all file opens in `with...as` to ensure files are closed
* WIP: handle f(a := 1)
* Tests and Cleanup - No longer skips keyword arg test. Keyword arg test now uses a simpler test case and does not rely on an external file. Remove print statements from ast.c
* Tests - Refactor last remaining test case that relied on on external file to use a simpler test case without the dependency
* Tests - Add better description of remaning skipped tests. Add test checking scope when using assignment expression in a function argument
* Tests - Add test for nested comprehension, testing value and scope. Fix variable name in skipped comprehension scope test
* Handle restriction of LHS for named expressions - can only assign to LHS of type NAME. Specifically, restrict assignment to tuples
This adds an alternative set_context specifically for named expressions,
set_namedexpr_context. Thus, context is now set differently for standard
assignment versus assignment for named expressions in order to handle
restrictions.
* Tests - Update negative test case for assigning to lambda to match new error message. Add negative test case for assigning to tuple
* Tests - Reorder test cases to group invalid syntax cases and named assignment target errors
* Tests - Update test case for named expression in function argument - check that result and variable are set correctly
* Todo - Add todo for TargetScopeError based on Guido's comment (2b3acd37bd (r30472562))
* Tests - Add named expression tests for assignment operator in function arguments
Note: One of two tests are skipped, as function arguments are currently treating
an assignment expression inside of parenthesis as one child, which does
not properly catch the named expression, nor does it count arguments
properly
* Add NamedStore to expr_context. Regenerate related code with `make regen-ast`
* Add usage of NamedStore to ast_for_named_expr in ast.c. Update occurances of checking for Store to also handle NamedStore where appropriate
* Add ste_comprehension to _symtable_entry to track if the namespace is a comprehension. Initialize ste_comprehension to 0. Set set_comprehension to 1 in symtable_handle_comprehension
* s/symtable_add_def/symtable_add_def_helper. Add symtable_add_def to handle grabbing st->st_cur and passing it to symtable_add_def_helper. This now allows us to call the original code from symtable_add_def by instead calling symtable_add_def_helper with a different ste.
* Refactor symtable_record_directive to take lineno and col_offset as arguments instead of stmt_ty. This allows symtable_record_directive to be used for stmt_ty and expr_ty
* Handle elevating scope for named expressions in comprehensions.
* Handle error for usage of named expression inside a class block
* Tests - No longer skip scope tests. Add additional scope tests
* Cleanup - Update error message for named expression within a comprehension within a class. Update comments. Add assert for symtable_extend_namedexpr_scope to validate that we always find at least a ModuleScope if we don't find a Class or FunctionScope
* Cleanup - Add missing case for NamedStore in expr_context_name. Remove unused var in set_namedexpr_content
* Refactor - Consolidate set_context and set_namedexpr_context to reduce duplicated code. Special cases for named expressions are handled by checking if ctx is NamedStore
* Cleanup - Add additional use cases for ast_for_namedexpr in usage comment. Fix multiple blank lines in test_named_expressions
* Tests - Remove unnecessary test case. Renumber test case function names
* Remove TargetScopeError for now. Will add back if needed
* Cleanup - Small comment nit for consistency
* Handle positional argument check with named expression
* Add TargetScopeError exception definition. Add documentation for TargetScopeError in c-api docs. Throw TargetScopeError instead of SyntaxError when using a named expression in a comprehension within a class scope
* Increase stack size for parser by 200. This is a minimal change (approx. 5kb) and should not have an impact on any systems. Update parser test to allow 99 nested levels again
* Add TargetScopeError to exception_hierarchy.txt for test_baseexception.py_
* Tests - Major update for named expression tests, both in test_named_expressions and test_parser
- Add test for TargetScopeError
- Add tests for named expressions in comprehension scope and edge cases
- Add tests for named expressions in function arguments (declarations
and call sites)
- Reorganize tests to group them more logically
* Cleanup - Remove unnecessary comment
* Cleanup - Comment nitpicks
* Explicitly disallow assignment expressions to a name inside parentheses, e.g.: ((x) := 0)
- Add check for LHS types to detect a parenthesis then a name (see note)
- Add test for this scenario
- Update tests for changed error message for named assignment to a tuple
(also, see note)
Note: This caused issues with the previous error handling for named assignment
to a LHS that contained an expression, such as a tuple. Thus, the check
for the LHS of a named expression must be changed to be more specific if
we wish to maintain the previous error messages
* Cleanup - Wrap lines more strictly in test file
* Revert "Explicitly disallow assignment expressions to a name inside parentheses, e.g.: ((x) := 0)"
This reverts commit f1531400ca7d7a2d148830c8ac703f041740896d.
* Add NEWS.d entry
* Tests - Fix error in test_pickle.test_exceptions by adding TargetScopeError to list of exceptions
* Tests - Update error message tests to reflect improved messaging convention (s/can't/cannot)
* Remove cases that cannot be reached in compile.c. Small linting update.
* Update Grammar/Tokens to add COLONEQUAL. Regenerate all files
* Update TargetScopeError PRE_INIT and POST_INIT, as this was purposefully left out when fixing rebase conflicts
* Add NamedStore back and regenerate files
* Pass along line number and end col info for named expression
* Simplify News entry
* Fix compiler warning and explicity mark fallthrough
956 lines
34 KiB
Python
956 lines
34 KiB
Python
import copy
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import parser
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import pickle
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import unittest
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import operator
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import struct
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from test import support
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from test.support.script_helper import assert_python_failure
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#
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# First, we test that we can generate trees from valid source fragments,
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# and that these valid trees are indeed allowed by the tree-loading side
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# of the parser module.
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#
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class RoundtripLegalSyntaxTestCase(unittest.TestCase):
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def roundtrip(self, f, s):
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st1 = f(s)
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t = st1.totuple()
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try:
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st2 = parser.sequence2st(t)
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except parser.ParserError as why:
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self.fail("could not roundtrip %r: %s" % (s, why))
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self.assertEqual(t, st2.totuple(),
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"could not re-generate syntax tree")
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def check_expr(self, s):
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self.roundtrip(parser.expr, s)
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def test_flags_passed(self):
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# The unicode literals flags has to be passed from the parser to AST
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# generation.
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suite = parser.suite("from __future__ import unicode_literals; x = ''")
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code = suite.compile()
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scope = {}
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exec(code, {}, scope)
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self.assertIsInstance(scope["x"], str)
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def check_suite(self, s):
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self.roundtrip(parser.suite, s)
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def test_yield_statement(self):
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self.check_suite("def f(): yield 1")
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self.check_suite("def f(): yield")
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self.check_suite("def f(): x += yield")
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self.check_suite("def f(): x = yield 1")
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self.check_suite("def f(): x = y = yield 1")
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self.check_suite("def f(): x = yield")
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self.check_suite("def f(): x = y = yield")
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self.check_suite("def f(): 1 + (yield)*2")
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self.check_suite("def f(): (yield 1)*2")
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self.check_suite("def f(): return; yield 1")
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self.check_suite("def f(): yield 1; return")
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self.check_suite("def f(): yield from 1")
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self.check_suite("def f(): x = yield from 1")
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self.check_suite("def f(): f((yield from 1))")
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self.check_suite("def f(): yield 1; return 1")
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self.check_suite("def f():\n"
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" for x in range(30):\n"
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" yield x\n")
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self.check_suite("def f():\n"
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" if (yield):\n"
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" yield x\n")
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def test_await_statement(self):
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self.check_suite("async def f():\n await smth()")
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self.check_suite("async def f():\n foo = await smth()")
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self.check_suite("async def f():\n foo, bar = await smth()")
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self.check_suite("async def f():\n (await smth())")
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self.check_suite("async def f():\n foo((await smth()))")
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self.check_suite("async def f():\n await foo(); return 42")
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def test_async_with_statement(self):
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self.check_suite("async def f():\n async with 1: pass")
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self.check_suite("async def f():\n async with a as b, c as d: pass")
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def test_async_for_statement(self):
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self.check_suite("async def f():\n async for i in (): pass")
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self.check_suite("async def f():\n async for i, b in (): pass")
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def test_nonlocal_statement(self):
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self.check_suite("def f():\n"
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" x = 0\n"
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" def g():\n"
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" nonlocal x\n")
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self.check_suite("def f():\n"
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" x = y = 0\n"
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" def g():\n"
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" nonlocal x, y\n")
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def test_expressions(self):
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self.check_expr("foo(1)")
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self.check_expr("[1, 2, 3]")
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self.check_expr("[x**3 for x in range(20)]")
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self.check_expr("[x**3 for x in range(20) if x % 3]")
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self.check_expr("[x**3 for x in range(20) if x % 2 if x % 3]")
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self.check_expr("list(x**3 for x in range(20))")
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self.check_expr("list(x**3 for x in range(20) if x % 3)")
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self.check_expr("list(x**3 for x in range(20) if x % 2 if x % 3)")
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self.check_expr("foo(*args)")
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self.check_expr("foo(*args, **kw)")
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self.check_expr("foo(**kw)")
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self.check_expr("foo(key=value)")
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self.check_expr("foo(key=value, *args)")
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self.check_expr("foo(key=value, *args, **kw)")
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self.check_expr("foo(key=value, **kw)")
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self.check_expr("foo(a, b, c, *args)")
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self.check_expr("foo(a, b, c, *args, **kw)")
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self.check_expr("foo(a, b, c, **kw)")
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self.check_expr("foo(a, *args, keyword=23)")
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self.check_expr("foo + bar")
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self.check_expr("foo - bar")
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self.check_expr("foo * bar")
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self.check_expr("foo / bar")
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self.check_expr("foo // bar")
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self.check_expr("(foo := 1)")
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self.check_expr("lambda: 0")
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self.check_expr("lambda x: 0")
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self.check_expr("lambda *y: 0")
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self.check_expr("lambda *y, **z: 0")
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self.check_expr("lambda **z: 0")
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self.check_expr("lambda x, y: 0")
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self.check_expr("lambda foo=bar: 0")
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self.check_expr("lambda foo=bar, spaz=nifty+spit: 0")
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self.check_expr("lambda foo=bar, **z: 0")
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self.check_expr("lambda foo=bar, blaz=blat+2, **z: 0")
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self.check_expr("lambda foo=bar, blaz=blat+2, *y, **z: 0")
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self.check_expr("lambda x, *y, **z: 0")
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self.check_expr("(x for x in range(10))")
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self.check_expr("foo(x for x in range(10))")
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self.check_expr("...")
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self.check_expr("a[...]")
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def test_simple_expression(self):
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# expr_stmt
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self.check_suite("a")
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def test_simple_assignments(self):
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self.check_suite("a = b")
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self.check_suite("a = b = c = d = e")
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def test_var_annot(self):
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self.check_suite("x: int = 5")
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self.check_suite("y: List[T] = []; z: [list] = fun()")
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self.check_suite("x: tuple = (1, 2)")
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self.check_suite("d[f()]: int = 42")
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self.check_suite("f(d[x]): str = 'abc'")
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self.check_suite("x.y.z.w: complex = 42j")
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self.check_suite("x: int")
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self.check_suite("def f():\n"
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" x: str\n"
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" y: int = 5\n")
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self.check_suite("class C:\n"
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" x: str\n"
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" y: int = 5\n")
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self.check_suite("class C:\n"
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" def __init__(self, x: int) -> None:\n"
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" self.x: int = x\n")
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# double check for nonsense
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with self.assertRaises(SyntaxError):
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exec("2+2: int", {}, {})
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with self.assertRaises(SyntaxError):
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exec("[]: int = 5", {}, {})
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with self.assertRaises(SyntaxError):
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exec("x, *y, z: int = range(5)", {}, {})
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with self.assertRaises(SyntaxError):
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exec("t: tuple = 1, 2", {}, {})
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with self.assertRaises(SyntaxError):
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exec("u = v: int", {}, {})
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with self.assertRaises(SyntaxError):
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exec("False: int", {}, {})
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with self.assertRaises(SyntaxError):
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exec("x.False: int", {}, {})
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with self.assertRaises(SyntaxError):
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exec("x.y,: int", {}, {})
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with self.assertRaises(SyntaxError):
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exec("[0]: int", {}, {})
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with self.assertRaises(SyntaxError):
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exec("f(): int", {}, {})
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def test_simple_augmented_assignments(self):
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self.check_suite("a += b")
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self.check_suite("a -= b")
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self.check_suite("a *= b")
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self.check_suite("a /= b")
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self.check_suite("a //= b")
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self.check_suite("a %= b")
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self.check_suite("a &= b")
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self.check_suite("a |= b")
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self.check_suite("a ^= b")
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self.check_suite("a <<= b")
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self.check_suite("a >>= b")
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self.check_suite("a **= b")
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def test_function_defs(self):
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self.check_suite("def f(): pass")
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self.check_suite("def f(*args): pass")
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self.check_suite("def f(*args, **kw): pass")
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self.check_suite("def f(**kw): pass")
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self.check_suite("def f(foo=bar): pass")
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self.check_suite("def f(foo=bar, *args): pass")
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self.check_suite("def f(foo=bar, *args, **kw): pass")
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self.check_suite("def f(foo=bar, **kw): pass")
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self.check_suite("def f(a, b): pass")
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self.check_suite("def f(a, b, *args): pass")
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self.check_suite("def f(a, b, *args, **kw): pass")
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self.check_suite("def f(a, b, **kw): pass")
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self.check_suite("def f(a, b, foo=bar): pass")
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self.check_suite("def f(a, b, foo=bar, *args): pass")
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self.check_suite("def f(a, b, foo=bar, *args, **kw): pass")
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self.check_suite("def f(a, b, foo=bar, **kw): pass")
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self.check_suite("@staticmethod\n"
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"def f(): pass")
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self.check_suite("@staticmethod\n"
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"@funcattrs(x, y)\n"
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"def f(): pass")
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self.check_suite("@funcattrs()\n"
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"def f(): pass")
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# keyword-only arguments
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self.check_suite("def f(*, a): pass")
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self.check_suite("def f(*, a = 5): pass")
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self.check_suite("def f(*, a = 5, b): pass")
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self.check_suite("def f(*, a, b = 5): pass")
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self.check_suite("def f(*, a, b = 5, **kwds): pass")
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self.check_suite("def f(*args, a): pass")
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self.check_suite("def f(*args, a = 5): pass")
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self.check_suite("def f(*args, a = 5, b): pass")
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self.check_suite("def f(*args, a, b = 5): pass")
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self.check_suite("def f(*args, a, b = 5, **kwds): pass")
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# function annotations
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self.check_suite("def f(a: int): pass")
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self.check_suite("def f(a: int = 5): pass")
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self.check_suite("def f(*args: list): pass")
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self.check_suite("def f(**kwds: dict): pass")
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self.check_suite("def f(*, a: int): pass")
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self.check_suite("def f(*, a: int = 5): pass")
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self.check_suite("def f() -> int: pass")
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def test_class_defs(self):
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self.check_suite("class foo():pass")
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self.check_suite("class foo(object):pass")
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self.check_suite("@class_decorator\n"
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"class foo():pass")
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self.check_suite("@class_decorator(arg)\n"
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"class foo():pass")
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self.check_suite("@decorator1\n"
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"@decorator2\n"
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"class foo():pass")
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def test_import_from_statement(self):
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self.check_suite("from sys.path import *")
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self.check_suite("from sys.path import dirname")
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self.check_suite("from sys.path import (dirname)")
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self.check_suite("from sys.path import (dirname,)")
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self.check_suite("from sys.path import dirname as my_dirname")
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self.check_suite("from sys.path import (dirname as my_dirname)")
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self.check_suite("from sys.path import (dirname as my_dirname,)")
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self.check_suite("from sys.path import dirname, basename")
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self.check_suite("from sys.path import (dirname, basename)")
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self.check_suite("from sys.path import (dirname, basename,)")
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self.check_suite(
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"from sys.path import dirname as my_dirname, basename")
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self.check_suite(
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"from sys.path import (dirname as my_dirname, basename)")
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self.check_suite(
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"from sys.path import (dirname as my_dirname, basename,)")
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self.check_suite(
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"from sys.path import dirname, basename as my_basename")
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self.check_suite(
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"from sys.path import (dirname, basename as my_basename)")
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self.check_suite(
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"from sys.path import (dirname, basename as my_basename,)")
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self.check_suite("from .bogus import x")
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def test_basic_import_statement(self):
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self.check_suite("import sys")
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self.check_suite("import sys as system")
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self.check_suite("import sys, math")
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self.check_suite("import sys as system, math")
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self.check_suite("import sys, math as my_math")
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def test_relative_imports(self):
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self.check_suite("from . import name")
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self.check_suite("from .. import name")
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# check all the way up to '....', since '...' is tokenized
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# differently from '.' (it's an ellipsis token).
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self.check_suite("from ... import name")
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self.check_suite("from .... import name")
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self.check_suite("from .pkg import name")
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self.check_suite("from ..pkg import name")
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self.check_suite("from ...pkg import name")
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self.check_suite("from ....pkg import name")
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def test_pep263(self):
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self.check_suite("# -*- coding: iso-8859-1 -*-\n"
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"pass\n")
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def test_assert(self):
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self.check_suite("assert alo < ahi and blo < bhi\n")
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|
|
def test_with(self):
|
|
self.check_suite("with open('x'): pass\n")
|
|
self.check_suite("with open('x') as f: pass\n")
|
|
self.check_suite("with open('x') as f, open('y') as g: pass\n")
|
|
|
|
def test_try_stmt(self):
|
|
self.check_suite("try: pass\nexcept: pass\n")
|
|
self.check_suite("try: pass\nfinally: pass\n")
|
|
self.check_suite("try: pass\nexcept A: pass\nfinally: pass\n")
|
|
self.check_suite("try: pass\nexcept A: pass\nexcept: pass\n"
|
|
"finally: pass\n")
|
|
self.check_suite("try: pass\nexcept: pass\nelse: pass\n")
|
|
self.check_suite("try: pass\nexcept: pass\nelse: pass\n"
|
|
"finally: pass\n")
|
|
|
|
def test_position(self):
|
|
# An absolutely minimal test of position information. Better
|
|
# tests would be a big project.
|
|
code = "def f(x):\n return x + 1"
|
|
st = parser.suite(code)
|
|
|
|
def walk(tree):
|
|
node_type = tree[0]
|
|
next = tree[1]
|
|
if isinstance(next, (tuple, list)):
|
|
for elt in tree[1:]:
|
|
for x in walk(elt):
|
|
yield x
|
|
else:
|
|
yield tree
|
|
|
|
expected = [
|
|
(1, 'def', 1, 0),
|
|
(1, 'f', 1, 4),
|
|
(7, '(', 1, 5),
|
|
(1, 'x', 1, 6),
|
|
(8, ')', 1, 7),
|
|
(11, ':', 1, 8),
|
|
(4, '', 1, 9),
|
|
(5, '', 2, -1),
|
|
(1, 'return', 2, 4),
|
|
(1, 'x', 2, 11),
|
|
(14, '+', 2, 13),
|
|
(2, '1', 2, 15),
|
|
(4, '', 2, 16),
|
|
(6, '', 2, -1),
|
|
(4, '', 2, -1),
|
|
(0, '', 2, -1),
|
|
]
|
|
|
|
self.assertEqual(list(walk(st.totuple(line_info=True, col_info=True))),
|
|
expected)
|
|
self.assertEqual(list(walk(st.totuple())),
|
|
[(t, n) for t, n, l, c in expected])
|
|
self.assertEqual(list(walk(st.totuple(line_info=True))),
|
|
[(t, n, l) for t, n, l, c in expected])
|
|
self.assertEqual(list(walk(st.totuple(col_info=True))),
|
|
[(t, n, c) for t, n, l, c in expected])
|
|
self.assertEqual(list(walk(st.tolist(line_info=True, col_info=True))),
|
|
[list(x) for x in expected])
|
|
self.assertEqual(list(walk(parser.st2tuple(st, line_info=True,
|
|
col_info=True))),
|
|
expected)
|
|
self.assertEqual(list(walk(parser.st2list(st, line_info=True,
|
|
col_info=True))),
|
|
[list(x) for x in expected])
|
|
|
|
def test_extended_unpacking(self):
|
|
self.check_suite("*a = y")
|
|
self.check_suite("x, *b, = m")
|
|
self.check_suite("[*a, *b] = y")
|
|
self.check_suite("for [*x, b] in x: pass")
|
|
|
|
def test_raise_statement(self):
|
|
self.check_suite("raise\n")
|
|
self.check_suite("raise e\n")
|
|
self.check_suite("try:\n"
|
|
" suite\n"
|
|
"except Exception as e:\n"
|
|
" raise ValueError from e\n")
|
|
|
|
def test_list_displays(self):
|
|
self.check_expr('[]')
|
|
self.check_expr('[*{2}, 3, *[4]]')
|
|
|
|
def test_set_displays(self):
|
|
self.check_expr('{*{2}, 3, *[4]}')
|
|
self.check_expr('{2}')
|
|
self.check_expr('{2,}')
|
|
self.check_expr('{2, 3}')
|
|
self.check_expr('{2, 3,}')
|
|
|
|
def test_dict_displays(self):
|
|
self.check_expr('{}')
|
|
self.check_expr('{a:b}')
|
|
self.check_expr('{a:b,}')
|
|
self.check_expr('{a:b, c:d}')
|
|
self.check_expr('{a:b, c:d,}')
|
|
self.check_expr('{**{}}')
|
|
self.check_expr('{**{}, 3:4, **{5:6, 7:8}}')
|
|
|
|
def test_argument_unpacking(self):
|
|
self.check_expr("f(*a, **b)")
|
|
self.check_expr('f(a, *b, *c, *d)')
|
|
self.check_expr('f(**a, **b)')
|
|
self.check_expr('f(2, *a, *b, **b, **c, **d)')
|
|
self.check_expr("f(*b, *() or () and (), **{} and {}, **() or {})")
|
|
|
|
def test_set_comprehensions(self):
|
|
self.check_expr('{x for x in seq}')
|
|
self.check_expr('{f(x) for x in seq}')
|
|
self.check_expr('{f(x) for x in seq if condition(x)}')
|
|
|
|
def test_dict_comprehensions(self):
|
|
self.check_expr('{x:x for x in seq}')
|
|
self.check_expr('{x**2:x[3] for x in seq if condition(x)}')
|
|
self.check_expr('{x:x for x in seq1 for y in seq2 if condition(x, y)}')
|
|
|
|
def test_named_expressions(self):
|
|
self.check_suite("(a := 1)")
|
|
self.check_suite("(a := a)")
|
|
self.check_suite("if (match := pattern.search(data)) is None: pass")
|
|
self.check_suite("[y := f(x), y**2, y**3]")
|
|
self.check_suite("filtered_data = [y for x in data if (y := f(x)) is None]")
|
|
self.check_suite("(y := f(x))")
|
|
self.check_suite("y0 = (y1 := f(x))")
|
|
self.check_suite("foo(x=(y := f(x)))")
|
|
self.check_suite("def foo(answer=(p := 42)): pass")
|
|
self.check_suite("def foo(answer: (p := 42) = 5): pass")
|
|
self.check_suite("lambda: (x := 1)")
|
|
self.check_suite("(x := lambda: 1)")
|
|
self.check_suite("(x := lambda: (y := 1))") # not in PEP
|
|
self.check_suite("lambda line: (m := re.match(pattern, line)) and m.group(1)")
|
|
self.check_suite("x = (y := 0)")
|
|
self.check_suite("(z:=(y:=(x:=0)))")
|
|
self.check_suite("(info := (name, phone, *rest))")
|
|
self.check_suite("(x:=1,2)")
|
|
self.check_suite("(total := total + tax)")
|
|
self.check_suite("len(lines := f.readlines())")
|
|
self.check_suite("foo(x := 3, cat='vector')")
|
|
self.check_suite("foo(cat=(category := 'vector'))")
|
|
self.check_suite("if any(len(longline := l) >= 100 for l in lines): print(longline)")
|
|
self.check_suite(
|
|
"if env_base := os.environ.get('PYTHONUSERBASE', None): return env_base"
|
|
)
|
|
self.check_suite(
|
|
"if self._is_special and (ans := self._check_nans(context=context)): return ans"
|
|
)
|
|
self.check_suite("foo(b := 2, a=1)")
|
|
self.check_suite("foo(b := 2, a=1)")
|
|
self.check_suite("foo((b := 2), a=1)")
|
|
self.check_suite("foo(c=(b := 2), a=1)")
|
|
|
|
#
|
|
# Second, we take *invalid* trees and make sure we get ParserError
|
|
# rejections for them.
|
|
#
|
|
|
|
class IllegalSyntaxTestCase(unittest.TestCase):
|
|
|
|
def check_bad_tree(self, tree, label):
|
|
try:
|
|
parser.sequence2st(tree)
|
|
except parser.ParserError:
|
|
pass
|
|
else:
|
|
self.fail("did not detect invalid tree for %r" % label)
|
|
|
|
def test_junk(self):
|
|
# not even remotely valid:
|
|
self.check_bad_tree((1, 2, 3), "<junk>")
|
|
|
|
def test_illegal_terminal(self):
|
|
tree = \
|
|
(257,
|
|
(269,
|
|
(270,
|
|
(271,
|
|
(277,
|
|
(1,))),
|
|
(4, ''))),
|
|
(4, ''),
|
|
(0, ''))
|
|
self.check_bad_tree(tree, "too small items in terminal node")
|
|
tree = \
|
|
(257,
|
|
(269,
|
|
(270,
|
|
(271,
|
|
(277,
|
|
(1, b'pass'))),
|
|
(4, ''))),
|
|
(4, ''),
|
|
(0, ''))
|
|
self.check_bad_tree(tree, "non-string second item in terminal node")
|
|
tree = \
|
|
(257,
|
|
(269,
|
|
(270,
|
|
(271,
|
|
(277,
|
|
(1, 'pass', '0', 0))),
|
|
(4, ''))),
|
|
(4, ''),
|
|
(0, ''))
|
|
self.check_bad_tree(tree, "non-integer third item in terminal node")
|
|
tree = \
|
|
(257,
|
|
(269,
|
|
(270,
|
|
(271,
|
|
(277,
|
|
(1, 'pass', 0, 0))),
|
|
(4, ''))),
|
|
(4, ''),
|
|
(0, ''))
|
|
self.check_bad_tree(tree, "too many items in terminal node")
|
|
|
|
def test_illegal_yield_1(self):
|
|
# Illegal yield statement: def f(): return 1; yield 1
|
|
tree = \
|
|
(257,
|
|
(264,
|
|
(285,
|
|
(259,
|
|
(1, 'def'),
|
|
(1, 'f'),
|
|
(260, (7, '('), (8, ')')),
|
|
(11, ':'),
|
|
(291,
|
|
(4, ''),
|
|
(5, ''),
|
|
(264,
|
|
(265,
|
|
(266,
|
|
(272,
|
|
(275,
|
|
(1, 'return'),
|
|
(313,
|
|
(292,
|
|
(293,
|
|
(294,
|
|
(295,
|
|
(297,
|
|
(298,
|
|
(299,
|
|
(300,
|
|
(301,
|
|
(302, (303, (304, (305, (2, '1')))))))))))))))))),
|
|
(264,
|
|
(265,
|
|
(266,
|
|
(272,
|
|
(276,
|
|
(1, 'yield'),
|
|
(313,
|
|
(292,
|
|
(293,
|
|
(294,
|
|
(295,
|
|
(297,
|
|
(298,
|
|
(299,
|
|
(300,
|
|
(301,
|
|
(302,
|
|
(303, (304, (305, (2, '1')))))))))))))))))),
|
|
(4, ''))),
|
|
(6, ''))))),
|
|
(4, ''),
|
|
(0, ''))))
|
|
self.check_bad_tree(tree, "def f():\n return 1\n yield 1")
|
|
|
|
def test_illegal_yield_2(self):
|
|
# Illegal return in generator: def f(): return 1; yield 1
|
|
tree = \
|
|
(257,
|
|
(264,
|
|
(265,
|
|
(266,
|
|
(278,
|
|
(1, 'from'),
|
|
(281, (1, '__future__')),
|
|
(1, 'import'),
|
|
(279, (1, 'generators')))),
|
|
(4, ''))),
|
|
(264,
|
|
(285,
|
|
(259,
|
|
(1, 'def'),
|
|
(1, 'f'),
|
|
(260, (7, '('), (8, ')')),
|
|
(11, ':'),
|
|
(291,
|
|
(4, ''),
|
|
(5, ''),
|
|
(264,
|
|
(265,
|
|
(266,
|
|
(272,
|
|
(275,
|
|
(1, 'return'),
|
|
(313,
|
|
(292,
|
|
(293,
|
|
(294,
|
|
(295,
|
|
(297,
|
|
(298,
|
|
(299,
|
|
(300,
|
|
(301,
|
|
(302, (303, (304, (305, (2, '1')))))))))))))))))),
|
|
(264,
|
|
(265,
|
|
(266,
|
|
(272,
|
|
(276,
|
|
(1, 'yield'),
|
|
(313,
|
|
(292,
|
|
(293,
|
|
(294,
|
|
(295,
|
|
(297,
|
|
(298,
|
|
(299,
|
|
(300,
|
|
(301,
|
|
(302,
|
|
(303, (304, (305, (2, '1')))))))))))))))))),
|
|
(4, ''))),
|
|
(6, ''))))),
|
|
(4, ''),
|
|
(0, ''))))
|
|
self.check_bad_tree(tree, "def f():\n return 1\n yield 1")
|
|
|
|
def test_a_comma_comma_c(self):
|
|
# Illegal input: a,,c
|
|
tree = \
|
|
(258,
|
|
(311,
|
|
(290,
|
|
(291,
|
|
(292,
|
|
(293,
|
|
(295,
|
|
(296,
|
|
(297,
|
|
(298, (299, (300, (301, (302, (303, (1, 'a')))))))))))))),
|
|
(12, ','),
|
|
(12, ','),
|
|
(290,
|
|
(291,
|
|
(292,
|
|
(293,
|
|
(295,
|
|
(296,
|
|
(297,
|
|
(298, (299, (300, (301, (302, (303, (1, 'c'))))))))))))))),
|
|
(4, ''),
|
|
(0, ''))
|
|
self.check_bad_tree(tree, "a,,c")
|
|
|
|
def test_illegal_operator(self):
|
|
# Illegal input: a $= b
|
|
tree = \
|
|
(257,
|
|
(264,
|
|
(265,
|
|
(266,
|
|
(267,
|
|
(312,
|
|
(291,
|
|
(292,
|
|
(293,
|
|
(294,
|
|
(296,
|
|
(297,
|
|
(298,
|
|
(299,
|
|
(300, (301, (302, (303, (304, (1, 'a'))))))))))))))),
|
|
(268, (37, '$=')),
|
|
(312,
|
|
(291,
|
|
(292,
|
|
(293,
|
|
(294,
|
|
(296,
|
|
(297,
|
|
(298,
|
|
(299,
|
|
(300, (301, (302, (303, (304, (1, 'b'))))))))))))))))),
|
|
(4, ''))),
|
|
(0, ''))
|
|
self.check_bad_tree(tree, "a $= b")
|
|
|
|
def test_malformed_global(self):
|
|
#doesn't have global keyword in ast
|
|
tree = (257,
|
|
(264,
|
|
(265,
|
|
(266,
|
|
(282, (1, 'foo'))), (4, ''))),
|
|
(4, ''),
|
|
(0, ''))
|
|
self.check_bad_tree(tree, "malformed global ast")
|
|
|
|
def test_missing_import_source(self):
|
|
# from import fred
|
|
tree = \
|
|
(257,
|
|
(268,
|
|
(269,
|
|
(270,
|
|
(282,
|
|
(284, (1, 'from'), (1, 'import'),
|
|
(287, (285, (1, 'fred')))))),
|
|
(4, ''))),
|
|
(4, ''), (0, ''))
|
|
self.check_bad_tree(tree, "from import fred")
|
|
|
|
def test_illegal_encoding(self):
|
|
# Illegal encoding declaration
|
|
tree = \
|
|
(341,
|
|
(257, (0, '')))
|
|
self.check_bad_tree(tree, "missed encoding")
|
|
tree = \
|
|
(341,
|
|
(257, (0, '')),
|
|
b'iso-8859-1')
|
|
self.check_bad_tree(tree, "non-string encoding")
|
|
tree = \
|
|
(341,
|
|
(257, (0, '')),
|
|
'\udcff')
|
|
with self.assertRaises(UnicodeEncodeError):
|
|
parser.sequence2st(tree)
|
|
|
|
|
|
class CompileTestCase(unittest.TestCase):
|
|
|
|
# These tests are very minimal. :-(
|
|
|
|
def test_compile_expr(self):
|
|
st = parser.expr('2 + 3')
|
|
code = parser.compilest(st)
|
|
self.assertEqual(eval(code), 5)
|
|
|
|
def test_compile_suite(self):
|
|
st = parser.suite('x = 2; y = x + 3')
|
|
code = parser.compilest(st)
|
|
globs = {}
|
|
exec(code, globs)
|
|
self.assertEqual(globs['y'], 5)
|
|
|
|
def test_compile_error(self):
|
|
st = parser.suite('1 = 3 + 4')
|
|
self.assertRaises(SyntaxError, parser.compilest, st)
|
|
|
|
def test_compile_badunicode(self):
|
|
st = parser.suite('a = "\\U12345678"')
|
|
self.assertRaises(SyntaxError, parser.compilest, st)
|
|
st = parser.suite('a = "\\u1"')
|
|
self.assertRaises(SyntaxError, parser.compilest, st)
|
|
|
|
def test_issue_9011(self):
|
|
# Issue 9011: compilation of an unary minus expression changed
|
|
# the meaning of the ST, so that a second compilation produced
|
|
# incorrect results.
|
|
st = parser.expr('-3')
|
|
code1 = parser.compilest(st)
|
|
self.assertEqual(eval(code1), -3)
|
|
code2 = parser.compilest(st)
|
|
self.assertEqual(eval(code2), -3)
|
|
|
|
def test_compile_filename(self):
|
|
st = parser.expr('a + 5')
|
|
code = parser.compilest(st)
|
|
self.assertEqual(code.co_filename, '<syntax-tree>')
|
|
code = st.compile()
|
|
self.assertEqual(code.co_filename, '<syntax-tree>')
|
|
for filename in 'file.py', b'file.py':
|
|
code = parser.compilest(st, filename)
|
|
self.assertEqual(code.co_filename, 'file.py')
|
|
code = st.compile(filename)
|
|
self.assertEqual(code.co_filename, 'file.py')
|
|
for filename in bytearray(b'file.py'), memoryview(b'file.py'):
|
|
with self.assertWarns(DeprecationWarning):
|
|
code = parser.compilest(st, filename)
|
|
self.assertEqual(code.co_filename, 'file.py')
|
|
with self.assertWarns(DeprecationWarning):
|
|
code = st.compile(filename)
|
|
self.assertEqual(code.co_filename, 'file.py')
|
|
self.assertRaises(TypeError, parser.compilest, st, list(b'file.py'))
|
|
self.assertRaises(TypeError, st.compile, list(b'file.py'))
|
|
|
|
|
|
class ParserStackLimitTestCase(unittest.TestCase):
|
|
"""try to push the parser to/over its limits.
|
|
see http://bugs.python.org/issue1881 for a discussion
|
|
"""
|
|
def _nested_expression(self, level):
|
|
return "["*level+"]"*level
|
|
|
|
def test_deeply_nested_list(self):
|
|
# This has fluctuated between 99 levels in 2.x, down to 93 levels in
|
|
# 3.7.X and back up to 99 in 3.8.X. Related to MAXSTACK size in Parser.h
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|
e = self._nested_expression(99)
|
|
st = parser.expr(e)
|
|
st.compile()
|
|
|
|
def test_trigger_memory_error(self):
|
|
e = self._nested_expression(100)
|
|
rc, out, err = assert_python_failure('-c', e)
|
|
# parsing the expression will result in an error message
|
|
# followed by a MemoryError (see #11963)
|
|
self.assertIn(b's_push: parser stack overflow', err)
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|
self.assertIn(b'MemoryError', err)
|
|
|
|
class STObjectTestCase(unittest.TestCase):
|
|
"""Test operations on ST objects themselves"""
|
|
|
|
def test_comparisons(self):
|
|
# ST objects should support order and equality comparisons
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|
st1 = parser.expr('2 + 3')
|
|
st2 = parser.suite('x = 2; y = x + 3')
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|
st3 = parser.expr('list(x**3 for x in range(20))')
|
|
st1_copy = parser.expr('2 + 3')
|
|
st2_copy = parser.suite('x = 2; y = x + 3')
|
|
st3_copy = parser.expr('list(x**3 for x in range(20))')
|
|
|
|
# exercise fast path for object identity
|
|
self.assertEqual(st1 == st1, True)
|
|
self.assertEqual(st2 == st2, True)
|
|
self.assertEqual(st3 == st3, True)
|
|
# slow path equality
|
|
self.assertEqual(st1, st1_copy)
|
|
self.assertEqual(st2, st2_copy)
|
|
self.assertEqual(st3, st3_copy)
|
|
self.assertEqual(st1 == st2, False)
|
|
self.assertEqual(st1 == st3, False)
|
|
self.assertEqual(st2 == st3, False)
|
|
self.assertEqual(st1 != st1, False)
|
|
self.assertEqual(st2 != st2, False)
|
|
self.assertEqual(st3 != st3, False)
|
|
self.assertEqual(st1 != st1_copy, False)
|
|
self.assertEqual(st2 != st2_copy, False)
|
|
self.assertEqual(st3 != st3_copy, False)
|
|
self.assertEqual(st2 != st1, True)
|
|
self.assertEqual(st1 != st3, True)
|
|
self.assertEqual(st3 != st2, True)
|
|
# we don't particularly care what the ordering is; just that
|
|
# it's usable and self-consistent
|
|
self.assertEqual(st1 < st2, not (st2 <= st1))
|
|
self.assertEqual(st1 < st3, not (st3 <= st1))
|
|
self.assertEqual(st2 < st3, not (st3 <= st2))
|
|
self.assertEqual(st1 < st2, st2 > st1)
|
|
self.assertEqual(st1 < st3, st3 > st1)
|
|
self.assertEqual(st2 < st3, st3 > st2)
|
|
self.assertEqual(st1 <= st2, st2 >= st1)
|
|
self.assertEqual(st3 <= st1, st1 >= st3)
|
|
self.assertEqual(st2 <= st3, st3 >= st2)
|
|
# transitivity
|
|
bottom = min(st1, st2, st3)
|
|
top = max(st1, st2, st3)
|
|
mid = sorted([st1, st2, st3])[1]
|
|
self.assertTrue(bottom < mid)
|
|
self.assertTrue(bottom < top)
|
|
self.assertTrue(mid < top)
|
|
self.assertTrue(bottom <= mid)
|
|
self.assertTrue(bottom <= top)
|
|
self.assertTrue(mid <= top)
|
|
self.assertTrue(bottom <= bottom)
|
|
self.assertTrue(mid <= mid)
|
|
self.assertTrue(top <= top)
|
|
# interaction with other types
|
|
self.assertEqual(st1 == 1588.602459, False)
|
|
self.assertEqual('spanish armada' != st2, True)
|
|
self.assertRaises(TypeError, operator.ge, st3, None)
|
|
self.assertRaises(TypeError, operator.le, False, st1)
|
|
self.assertRaises(TypeError, operator.lt, st1, 1815)
|
|
self.assertRaises(TypeError, operator.gt, b'waterloo', st2)
|
|
|
|
def test_copy_pickle(self):
|
|
sts = [
|
|
parser.expr('2 + 3'),
|
|
parser.suite('x = 2; y = x + 3'),
|
|
parser.expr('list(x**3 for x in range(20))')
|
|
]
|
|
for st in sts:
|
|
st_copy = copy.copy(st)
|
|
self.assertEqual(st_copy.totuple(), st.totuple())
|
|
st_copy = copy.deepcopy(st)
|
|
self.assertEqual(st_copy.totuple(), st.totuple())
|
|
for proto in range(pickle.HIGHEST_PROTOCOL+1):
|
|
st_copy = pickle.loads(pickle.dumps(st, proto))
|
|
self.assertEqual(st_copy.totuple(), st.totuple())
|
|
|
|
check_sizeof = support.check_sizeof
|
|
|
|
@support.cpython_only
|
|
def test_sizeof(self):
|
|
def XXXROUNDUP(n):
|
|
if n <= 1:
|
|
return n
|
|
if n <= 128:
|
|
return (n + 3) & ~3
|
|
return 1 << (n - 1).bit_length()
|
|
|
|
basesize = support.calcobjsize('Pii')
|
|
nodesize = struct.calcsize('hP3iP0h2i')
|
|
def sizeofchildren(node):
|
|
if node is None:
|
|
return 0
|
|
res = 0
|
|
hasstr = len(node) > 1 and isinstance(node[-1], str)
|
|
if hasstr:
|
|
res += len(node[-1]) + 1
|
|
children = node[1:-1] if hasstr else node[1:]
|
|
if children:
|
|
res += XXXROUNDUP(len(children)) * nodesize
|
|
for child in children:
|
|
res += sizeofchildren(child)
|
|
return res
|
|
|
|
def check_st_sizeof(st):
|
|
self.check_sizeof(st, basesize + nodesize +
|
|
sizeofchildren(st.totuple()))
|
|
|
|
check_st_sizeof(parser.expr('2 + 3'))
|
|
check_st_sizeof(parser.expr('2 + 3 + 4'))
|
|
check_st_sizeof(parser.suite('x = 2 + 3'))
|
|
check_st_sizeof(parser.suite(''))
|
|
check_st_sizeof(parser.suite('# -*- coding: utf-8 -*-'))
|
|
check_st_sizeof(parser.expr('[' + '2,' * 1000 + ']'))
|
|
|
|
|
|
# XXX tests for pickling and unpickling of ST objects should go here
|
|
|
|
class OtherParserCase(unittest.TestCase):
|
|
|
|
def test_two_args_to_expr(self):
|
|
# See bug #12264
|
|
with self.assertRaises(TypeError):
|
|
parser.expr("a", "b")
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|