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* bpo-38673: dont switch to ps2 if the line starts with comment or whitespace ↵Batuhan Taşkaya2019-12-091-0/+6
| | | | | (GH-17421) https://bugs.python.org/issue38673
* bpo-36876: Moved Parser/listnode.c statics to interpreter state. (GH-16328)Vinay Sajip2019-11-071-10/+14
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* closes bpo-38648: Remove double tp_free slot in Python-ast.c. (GH-17002)Max Bernstein2019-10-311-1/+0
| | | This looks like a typo due to copy-paste.
* bpo-11410: Standardize and use symbol visibility attributes across POSIX and ↵Vinay Sajip2019-10-151-2/+3
| | | | Windows. (GH-16347)
* bpo-38425: Fix ‘res’ may be used uninitialized warning (GH-16688)Dong-hee Na2019-10-101-1/+2
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* bpo-38140: Make dict and weakref offsets opaque for C heap types (#16076)Eddie Elizondo2019-09-191-1/+7
| | | | | | * Make dict and weakref offsets opaque for C heap types * Add news
* Fix leaks in Python-ast.c (#16127)Eddie Elizondo2019-09-141-1/+5
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* bpo-21120: Exclude Python-ast.h, ast.h and asdl.h from the limited API (#14634)Zackery Spytz2019-09-121-0/+2
| | | | The PyArena type is not part of the limited API, so these headers shouldn't be part of it either.
* bpo-38113: Update the Python-ast.c generator to PEP384 (gh-15957)Dino Viehland2019-09-111-113/+187
| | | Summary: This mostly migrates Python-ast.c to PEP384 and removes all statics from the whole file. This modifies the generator itself that generates the Python-ast.c. It leaves in the usage of _PyObject_LookupAttr even though it's not fully PEP384 compatible (this could always be shimmed in by anyone who needs it).
* bpo-38083: Minor improvements in asdl_c.py and Python-ast.c. (GH-15824)Serhiy Storchaka2019-09-101-10/+15
| | | | | * Use the const qualifier for constant C strings. * Intern field and attribute names. * Temporary incref a borrowed reference to a list item.
* Mark files as executable that are meant as scripts. (GH-15354)Greg Price2019-09-091-0/+0
| | | | | | | | | | | | | | | | | | | | | | | | | This is the converse of GH-15353 -- in addition to plenty of scripts in the tree that are marked with the executable bit (and so can be directly executed), there are a few that have a leading `#!` which could let them be executed, but it doesn't do anything because they don't have the executable bit set. Here's a command which finds such files and marks them. The first line finds files in the tree with a `#!` line *anywhere*; the next-to-last step checks that the *first* line is actually of that form. In between we filter out files that already have the bit set, and some files that are meant as fragments to be consumed by one or another kind of preprocessor. $ git grep -l '^#!' \ | grep -vxFf <( \ git ls-files --stage \ | perl -lane 'print $F[3] if (!/^100644/)' \ ) \ | grep -ve '\.in$' -e '^Doc/includes/' \ | while read f; do head -c2 "$f" | grep -qxF '#!' \ && chmod a+x "$f"; \ done
* Fix typo in the algorithm description (GH-15774)Pablo Galindo2019-09-091-1/+1
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* Fix typos in the documentation of Parser/pgen (GH-15416)Shashi Ranjan2019-08-241-7/+7
| | | | Co-Authored-By: Antoine <43954001+awecx@users.noreply.github.com>
* Refactor Parser/pgen and add documentation and explanations (GH-15373)Pablo Galindo2019-08-227-332/+753
| | | | | | | | | | | | | | | | | | | | | | | | | | * Refactor Parser/pgen and add documentation and explanations To improve the readability and maintainability of the parser generator perform the following transformations: * Separate the metagrammar parser in its own class to simplify the parser generator logic. * Create separate classes for DFAs and NFAs and move methods that act exclusively on them from the parser generator to these classes. * Add docstrings and comment documenting the process to go from the grammar file into NFAs and then DFAs. Detail some of the algorithms and give some background explanations of some concepts that will helps readers not familiar with the parser generation process. * Select more descriptive names for some variables and variables. * PEP8 formatting and quote-style homogenization. The output of the parser generator remains the same (Include/graminit.h and Python/graminit.c remain untouched by running the new parser generator).
* Indent code inside if block. (GH-15284)Hansraj Das2019-08-151-1/+1
| | | Without indendation, seems like strcpy line is parallel to `if` condition.
* Fix `SyntaxError` indicator printing too many spaces for multi-line strings ↵Anthony Sottile2019-07-291-0/+2
| | | | (GH-14433)
* Remove duplicate call to strip method in Parser/pgen/token.py (GH-14938)Hansraj Das2019-07-241-6/+2
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* bpo-37593: Swap the positions of posonlyargs and args in the constructor of ↵Pablo Galindo2019-07-141-1/+1
| | | | | ast.parameters nodes (GH-14778) https://bugs.python.org/issue37593
* bpo-37253: Remove PyAST_obj2mod_ex() function (GH-14020)Victor Stinner2019-06-131-6/+0
| | | | PyAST_obj2mod_ex() is similar to PyAST_obj2mod() with an additional 'feature_version' parameter which is unused.
* bpo-36974: tp_print -> tp_vectorcall_offset and tp_reserved -> tp_as_async ↵Jeroen Demeyer2019-05-311-2/+2
| | | | | | | | | (GH-13464) Automatically replace tp_print -> tp_vectorcall_offset tp_compare -> tp_as_async tp_reserved -> tp_as_async
* bpo-37050: Remove expr_text from FormattedValue ast node, use Constant node ↵Eric V. Smith2019-05-271-1/+1
| | | | | instead (GH-13597) When using the "=" debug functionality of f-strings, use another Constant node (or a merged constant node) instead of adding expr_text to the FormattedValue node.
* bpo-36842: Implement PEP 578 (GH-12613)Steve Dower2019-05-232-0/+13
| | | Adds sys.audit, sys.addaudithook, io.open_code, and associated C APIs.
* bpo-36878: Only allow text after `# type: ignore` if first character ASCII ↵Michael J. Sullivan2019-05-221-2/+3
| | | | | | | | | | | (GH-13504) This disallows things like `# type: ignoreé`, which seems wrong. Also switch to using Py_ISALNUM for the alnum check, for consistency with other code (and maybe correctness re: locale issues?). https://bugs.python.org/issue36878
* bpo-36878: Track extra text added to 'type: ignore' in the AST (GH-13479)Michael J. Sullivan2019-05-223-19/+35
| | | | | GH-13238 made extra text after a # type: ignore accepted by the parser. This finishes the job and actually plumbs the extra text through the parser and makes it available in the AST.
* bpo-34616: Add PyCF_ALLOW_TOP_LEVEL_AWAIT to allow top-level await (GH-13148)Matthias Bussonnier2019-05-211-0/+2
| | | Co-Authored-By: Yury Selivanov <yury@magic.io>
* bpo-2180: Treat line continuation at EOF as a `SyntaxError` (GH-13401)Anthony Sottile2019-05-181-1/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This makes the parser consistent with the tokenize module (already the case in `pypy`). sample ------ ```python x = 5\ ``` before ------ ```console $ python3 t.py $ python3 -mtokenize t.py t.py:2:0: error: EOF in multi-line statement ``` after ----- ```console $ ./python t.py File "t.py", line 3 x = 5\ ^ SyntaxError: unexpected EOF while parsing $ ./python -m tokenize t.py t.py:2:0: error: EOF in multi-line statement ``` https://bugs.python.org/issue2180
* bpo-36878: Allow extra text after `# type: ignore` comments (GH-13238)Michael J. Sullivan2019-05-111-8/+5
| | | | | | | In the parser, when using the type_comments=True option, recognize a TYPE_IGNORE as anything containing `# type: ignore` followed by a non-alphanumeric character. This is to allow ignores such as `# type: ignore[E1000]`.
* bpo-36817: Add f-string debugging using '='. (GH-13123)Eric V. Smith2019-05-081-1/+1
| | | If a "=" is specified a the end of an f-string expression, the f-string will evaluate to the text of the expression, followed by '=', followed by the repr of the value of the expression.
* bpo-36540: PEP 570 -- Implementation (GH-12701)Pablo Galindo2019-04-291-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit contains the implementation of PEP570: Python positional-only parameters. * Update Grammar/Grammar with new typedarglist and varargslist * Regenerate grammar files * Update and regenerate AST related files * Update code object * Update marshal.c * Update compiler and symtable * Regenerate importlib files * Update callable objects * Implement positional-only args logic in ceval.c * Regenerate frozen data * Update standard library to account for positional-only args * Add test file for positional-only args * Update other test files to account for positional-only args * Add News entry * Update inspect module and related tests
* fix warnings by adding more const (GH-12924)Inada Naoki2019-04-234-20/+16
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* use `const` in graminit.c (GH-12713)tyomitch2019-04-231-3/+3
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* bpo-36623: Clean parser headers and include files (GH-12253)Pablo Galindo2019-04-139-7/+10
| | | After the removal of pgen, multiple header and function prototypes that lack implementation or are unused are still lying around.
* bpo-36459: Fix a possible double PyMem_FREE() due to tokenizer.c's ↵Zackery Spytz2019-03-281-1/+0
| | | | | | tok_nextc() (12601) Remove the PyMem_FREE() call added in cb90c89. The buffer will be freed when PyTokenizer_Free() is called on the tokenizer state.
* bpo-36143: Regenerate Lib/keyword.py from the Grammar and Tokens file using ↵Pablo Galindo2019-03-251-0/+60
| | | | | | pgen (GH-12456) Now that the parser generator is written in Python (Parser/pgen) we can make use of it to regenerate the Lib/keyword file that contains the language keywords instead of parsing the autogenerated grammar files. This also allows checking in the CI that the autogenerated files are up to date.
* bpo-36385: Add ``elif`` sentence on to avoid multiple ``if`` (GH-12478)Emmanuel Arias2019-03-211-2/+2
| | | | | | | | | | | Currently, when arguments on Parser/asdl_c.py are parsed ``ìf`` sentence is used. This PR Propose to use ``elif`` to avoid multiple evaluting of the ifs. https://bugs.python.org/issue36385
* bpo-36367: Free buffer if realloc fails in tokenize.c (GH-12442)Pablo Galindo2019-03-191-2/+8
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* bpo-36280: Add Constant.kind field (GH-12295)Guido van Rossum2019-03-131-1/+1
| | | | | | | | | | | | | | The value is a string for string and byte literals, None otherwise. It is 'u' for u"..." literals, 'b' for b"..." literals, '' for "..." literals. The 'r' (raw) prefix is ignored. Does not apply to f-strings. This appears sufficient to make mypy capable of using the stdlib ast module instead of typed_ast (assuming a mypy patch I'm working on). WIP: I need to make the tests pass. @ilevkivskyi @serhiy-storchaka https://bugs.python.org/issue36280
* Remove d_initial from the parser as it is unused (GH-12212)tyomitch2019-03-091-1/+1
| | | d_initial, the first state of a particular DFA in the parser has always been initialized to 0 in the old pgen as well as the new pgen. As this value is not used and the first state of each DFA is assumed to be the first element in the array representing it, remove d_initial from the parser to reduce complexity.
* bpo-35975: Support parsing earlier minor versions of Python 3 (GH-12086)Guido van Rossum2019-03-075-0/+96
| | | | | | | This adds a `feature_version` flag to `ast.parse()` (documented) and `compile()` (hidden) that allow tweaking the parser to support older versions of the grammar. In particular if `feature_version` is 5 or 6, the hacks for the `async` and `await` keyword from PEP 492 are reinstated. (For 7 or higher, these are unconditionally treated as keywords, but they are still special tokens rather than `NAME` tokens that the parser driver recognizes.) https://bugs.python.org/issue35975
* bpo-36187: Remove NamedStore. (GH-12167)Serhiy Storchaka2019-03-051-1/+1
| | | | | NamedStore has been replaced with Store. The difference between NamedStore and Store is handled when precess the NamedExpr node one level upper.
* Clean implementation of Parser/pgen and fix some style issues (GH-12156)Pablo Galindo2019-03-044-28/+14
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* Remove some code which has been dead since 1994 (#12136)Alex Gaynor2019-03-021-11/+0
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* bpo-35808: Retire pgen and use pgen2 to generate the parser (GH-11814)Pablo Galindo2019-03-0117-1727/+642
| | | | | Pgen is the oldest piece of technology in the CPython repository, building it requires various #if[n]def PGEN hacks in other parts of the code and it also depends more and more on CPython internals. This commit removes the old pgen C code and replaces it for a new version implemented in pure Python. This is a modified and adapted version of lib2to3/pgen2 that can generate grammar files compatibles with the current parser. This commit also eliminates all the #ifdef and code branches related to pgen, simplifying the code and making it more maintainable. The regen-grammar step now uses $(PYTHON_FOR_REGEN) that can be any version of the interpreter, so the new pgen code maintains compatibility with older versions of the interpreter (this also allows regenerating the grammar with the current CI solution that uses Python3.5). The new pgen Python module also makes use of the Grammar/Tokens file that holds the token specification, so is always kept in sync and avoids having to maintain duplicate token definitions.
* Fix potential memory leak in parsetok.c (GH-11832)Pablo Galindo2019-02-131-1/+2
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* bpo-35879: Fix type comment leaks (GH-11728)Guido van Rossum2019-02-011-0/+1
| | | | | * Fix leak for # type: ignore * Fix the type comment leak
* bpo-35766 follow-up: Kill half-support for FunctionType in PyAST_obj2mod ↵Guido van Rossum2019-02-011-3/+2
| | | | | | | (#11714) See https://github.com/python/cpython/pull/11645/files/229874c612df868e7ae3e997e159915f49d16542#r252631862 https://bugs.python.org/issue35766
* bpo-35766: Merge typed_ast back into CPython (GH-11645)Guido van Rossum2019-01-317-14/+177
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* bpo-35224: PEP 572 Implementation (#10497)Emily Morehouse2019-01-243-2/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | * 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 (https://github.com/python/cpython/commit/2b3acd37bdfc2d35e5094228c6684050d2aa8b0a#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
* bpo-33416: Add end positions to Python AST (GH-11605)Ivan Levkivskyi2019-01-226-18/+64
| | | | | | | | | | | | | | | | | | The majority of this PR is tediously passing `end_lineno` and `end_col_offset` everywhere. Here are non-trivial points: * It is not possible to reconstruct end positions in AST "on the fly", some information is lost after an AST node is constructed, so we need two more attributes for every AST node `end_lineno` and `end_col_offset`. * I add end position information to both CST and AST. Although it may be technically possible to avoid adding end positions to CST, the code becomes more cumbersome and less efficient. * Since the end position is not known for non-leaf CST nodes while the next token is added, this requires a bit of extra care (see `_PyNode_FinalizeEndPos`). Unless I made some mistake, the algorithm should be linear. * For statements, I "trim" the end position of suites to not include the terminal newlines and dedent (this seems to be what people would expect), for example in ```python class C: pass pass ``` the end line and end column for the class definition is (2, 8). * For `end_col_offset` I use the common Python convention for indexing, for example for `pass` the `end_col_offset` is 4 (not 3), so that `[0:4]` gives one the source code that corresponds to the node. * I added a helper function `ast.get_source_segment()`, to get source text segment corresponding to a given AST node. It is also useful for testing. An (inevitable) downside of this PR is that AST now takes almost 25% more memory. I think however it is probably justified by the benefits.
* bpo-16806: Fix `lineno` and `col_offset` for multi-line string tokens (GH-10021)Anthony Sottile2019-01-133-3/+24
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