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executable file
·5750 lines (4922 loc) · 200 KB
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#!/usr/bin/env python3
#
# Argument Clinic
# Copyright 2012-2013 by Larry Hastings.
# Licensed to the PSF under a contributor agreement.
#
from __future__ import annotations
import abc
import ast
import builtins as bltns
import collections
import contextlib
import copy
import cpp
import dataclasses as dc
import enum
import functools
import hashlib
import inspect
import io
import itertools
import os
import pprint
import re
import shlex
import string
import sys
import textwrap
import traceback
from collections.abc import (
Callable,
Iterable,
Iterator,
Sequence,
)
from types import FunctionType, NoneType
from typing import (
Any,
Final,
Literal,
NamedTuple,
NoReturn,
Protocol,
TypeGuard,
TypeVar,
cast,
overload,
)
# TODO:
#
# soon:
#
# * allow mixing any two of {positional-only, positional-or-keyword,
# keyword-only}
# * dict constructor uses positional-only and keyword-only
# * max and min use positional only with an optional group
# and keyword-only
#
version = '1'
NO_VARARG = "PY_SSIZE_T_MAX"
CLINIC_PREFIX = "__clinic_"
CLINIC_PREFIXED_ARGS = {
"_keywords",
"_parser",
"args",
"argsbuf",
"fastargs",
"kwargs",
"kwnames",
"nargs",
"noptargs",
"return_value",
}
class Sentinels(enum.Enum):
unspecified = "unspecified"
unknown = "unknown"
def __repr__(self) -> str:
return f"<{self.value.capitalize()}>"
unspecified: Final = Sentinels.unspecified
unknown: Final = Sentinels.unknown
# This one needs to be a distinct class, unlike the other two
class Null:
def __repr__(self) -> str:
return '<Null>'
NULL = Null()
sig_end_marker = '--'
Appender = Callable[[str], None]
Outputter = Callable[[], str]
TemplateDict = dict[str, str]
class _TextAccumulator(NamedTuple):
text: list[str]
append: Appender
output: Outputter
def _text_accumulator() -> _TextAccumulator:
text: list[str] = []
def output() -> str:
s = ''.join(text)
text.clear()
return s
return _TextAccumulator(text, text.append, output)
class TextAccumulator(NamedTuple):
append: Appender
output: Outputter
def text_accumulator() -> TextAccumulator:
"""
Creates a simple text accumulator / joiner.
Returns a pair of callables:
append, output
"append" appends a string to the accumulator.
"output" returns the contents of the accumulator
joined together (''.join(accumulator)) and
empties the accumulator.
"""
text, append, output = _text_accumulator()
return TextAccumulator(append, output)
@overload
def warn_or_fail(
*args: object,
fail: Literal[True],
filename: str | None = None,
line_number: int | None = None,
) -> NoReturn: ...
@overload
def warn_or_fail(
*args: object,
fail: Literal[False] = False,
filename: str | None = None,
line_number: int | None = None,
) -> None: ...
def warn_or_fail(
*args: object,
fail: bool = False,
filename: str | None = None,
line_number: int | None = None,
) -> None:
joined = " ".join([str(a) for a in args])
add, output = text_accumulator()
if fail:
add("Error")
else:
add("Warning")
if clinic:
if filename is None:
filename = clinic.filename
if getattr(clinic, 'block_parser', None) and (line_number is None):
line_number = clinic.block_parser.line_number
if filename is not None:
add(' in file "' + filename + '"')
if line_number is not None:
add(" on line " + str(line_number))
add(':\n')
add(joined)
print(output())
if fail:
sys.exit(-1)
def warn(
*args: object,
filename: str | None = None,
line_number: int | None = None,
) -> None:
return warn_or_fail(*args, filename=filename, line_number=line_number, fail=False)
def fail(
*args: object,
filename: str | None = None,
line_number: int | None = None,
) -> NoReturn:
warn_or_fail(*args, filename=filename, line_number=line_number, fail=True)
def quoted_for_c_string(s: str) -> str:
for old, new in (
('\\', '\\\\'), # must be first!
('"', '\\"'),
("'", "\\'"),
):
s = s.replace(old, new)
return s
def c_repr(s: str) -> str:
return '"' + s + '"'
is_legal_c_identifier = re.compile('^[A-Za-z_][A-Za-z0-9_]*$').match
def is_legal_py_identifier(s: str) -> bool:
return all(is_legal_c_identifier(field) for field in s.split('.'))
# identifiers that are okay in Python but aren't a good idea in C.
# so if they're used Argument Clinic will add "_value" to the end
# of the name in C.
c_keywords = set("""
asm auto break case char const continue default do double
else enum extern float for goto if inline int long
register return short signed sizeof static struct switch
typedef typeof union unsigned void volatile while
""".strip().split())
def ensure_legal_c_identifier(s: str) -> str:
# for now, just complain if what we're given isn't legal
if not is_legal_c_identifier(s):
fail("Illegal C identifier:", s)
# but if we picked a C keyword, pick something else
if s in c_keywords:
return s + "_value"
return s
def rstrip_lines(s: str) -> str:
text, add, output = _text_accumulator()
for line in s.split('\n'):
add(line.rstrip())
add('\n')
text.pop()
return output()
def format_escape(s: str) -> str:
# double up curly-braces, this string will be used
# as part of a format_map() template later
s = s.replace('{', '{{')
s = s.replace('}', '}}')
return s
def linear_format(s: str, **kwargs: str) -> str:
"""
Perform str.format-like substitution, except:
* The strings substituted must be on lines by
themselves. (This line is the "source line".)
* If the substitution text is empty, the source line
is removed in the output.
* If the field is not recognized, the original line
is passed unmodified through to the output.
* If the substitution text is not empty:
* Each line of the substituted text is indented
by the indent of the source line.
* A newline will be added to the end.
"""
add, output = text_accumulator()
for line in s.split('\n'):
indent, curly, trailing = line.partition('{')
if not curly:
add(line)
add('\n')
continue
name, curly, trailing = trailing.partition('}')
if not curly or name not in kwargs:
add(line)
add('\n')
continue
if trailing:
fail("Text found after {" + name + "} block marker! It must be on a line by itself.")
if indent.strip():
fail("Non-whitespace characters found before {" + name + "} block marker! It must be on a line by itself.")
value = kwargs[name]
if not value:
continue
value = textwrap.indent(rstrip_lines(value), indent)
add(value)
add('\n')
return output()[:-1]
def indent_all_lines(s: str, prefix: str) -> str:
"""
Returns 's', with 'prefix' prepended to all lines.
If the last line is empty, prefix is not prepended
to it. (If s is blank, returns s unchanged.)
(textwrap.indent only adds to non-blank lines.)
"""
split = s.split('\n')
last = split.pop()
final = []
for line in split:
final.append(prefix)
final.append(line)
final.append('\n')
if last:
final.append(prefix)
final.append(last)
return ''.join(final)
def suffix_all_lines(s: str, suffix: str) -> str:
"""
Returns 's', with 'suffix' appended to all lines.
If the last line is empty, suffix is not appended
to it. (If s is blank, returns s unchanged.)
"""
split = s.split('\n')
last = split.pop()
final = []
for line in split:
final.append(line)
final.append(suffix)
final.append('\n')
if last:
final.append(last)
final.append(suffix)
return ''.join(final)
def version_splitter(s: str) -> tuple[int, ...]:
"""Splits a version string into a tuple of integers.
The following ASCII characters are allowed, and employ
the following conversions:
a -> -3
b -> -2
c -> -1
(This permits Python-style version strings such as "1.4b3".)
"""
version: list[int] = []
accumulator: list[str] = []
def flush() -> None:
if not accumulator:
raise ValueError('Unsupported version string: ' + repr(s))
version.append(int(''.join(accumulator)))
accumulator.clear()
for c in s:
if c.isdigit():
accumulator.append(c)
elif c == '.':
flush()
elif c in 'abc':
flush()
version.append('abc'.index(c) - 3)
else:
raise ValueError('Illegal character ' + repr(c) + ' in version string ' + repr(s))
flush()
return tuple(version)
def version_comparitor(version1: str, version2: str) -> Literal[-1, 0, 1]:
iterator = itertools.zip_longest(version_splitter(version1), version_splitter(version2), fillvalue=0)
for i, (a, b) in enumerate(iterator):
if a < b:
return -1
if a > b:
return 1
return 0
class CRenderData:
def __init__(self) -> None:
# The C statements to declare variables.
# Should be full lines with \n eol characters.
self.declarations: list[str] = []
# The C statements required to initialize the variables before the parse call.
# Should be full lines with \n eol characters.
self.initializers: list[str] = []
# The C statements needed to dynamically modify the values
# parsed by the parse call, before calling the impl.
self.modifications: list[str] = []
# The entries for the "keywords" array for PyArg_ParseTuple.
# Should be individual strings representing the names.
self.keywords: list[str] = []
# The "format units" for PyArg_ParseTuple.
# Should be individual strings that will get
self.format_units: list[str] = []
# The varargs arguments for PyArg_ParseTuple.
self.parse_arguments: list[str] = []
# The parameter declarations for the impl function.
self.impl_parameters: list[str] = []
# The arguments to the impl function at the time it's called.
self.impl_arguments: list[str] = []
# For return converters: the name of the variable that
# should receive the value returned by the impl.
self.return_value = "return_value"
# For return converters: the code to convert the return
# value from the parse function. This is also where
# you should check the _return_value for errors, and
# "goto exit" if there are any.
self.return_conversion: list[str] = []
self.converter_retval = "_return_value"
# The C statements required to do some operations
# after the end of parsing but before cleaning up.
# These operations may be, for example, memory deallocations which
# can only be done without any error happening during argument parsing.
self.post_parsing: list[str] = []
# The C statements required to clean up after the impl call.
self.cleanup: list[str] = []
class FormatCounterFormatter(string.Formatter):
"""
This counts how many instances of each formatter
"replacement string" appear in the format string.
e.g. after evaluating "string {a}, {b}, {c}, {a}"
the counts dict would now look like
{'a': 2, 'b': 1, 'c': 1}
"""
def __init__(self) -> None:
self.counts = collections.Counter[str]()
def get_value(
self, key: str, args: object, kwargs: object # type: ignore[override]
) -> Literal['']:
self.counts[key] += 1
return ''
class Language(metaclass=abc.ABCMeta):
start_line = ""
body_prefix = ""
stop_line = ""
checksum_line = ""
def __init__(self, filename: str) -> None:
pass
@abc.abstractmethod
def render(
self,
clinic: Clinic | None,
signatures: Iterable[Module | Class | Function]
) -> str:
pass
def parse_line(self, line: str) -> None:
pass
def validate(self) -> None:
def assert_only_one(
attr: str,
*additional_fields: str
) -> None:
"""
Ensures that the string found at getattr(self, attr)
contains exactly one formatter replacement string for
each valid field. The list of valid fields is
['dsl_name'] extended by additional_fields.
e.g.
self.fmt = "{dsl_name} {a} {b}"
# this passes
self.assert_only_one('fmt', 'a', 'b')
# this fails, the format string has a {b} in it
self.assert_only_one('fmt', 'a')
# this fails, the format string doesn't have a {c} in it
self.assert_only_one('fmt', 'a', 'b', 'c')
# this fails, the format string has two {a}s in it,
# it must contain exactly one
self.fmt2 = '{dsl_name} {a} {a}'
self.assert_only_one('fmt2', 'a')
"""
fields = ['dsl_name']
fields.extend(additional_fields)
line: str = getattr(self, attr)
fcf = FormatCounterFormatter()
fcf.format(line)
def local_fail(should_be_there_but_isnt: bool) -> None:
if should_be_there_but_isnt:
fail("{} {} must contain {{{}}} exactly once!".format(
self.__class__.__name__, attr, name))
else:
fail("{} {} must not contain {{{}}}!".format(
self.__class__.__name__, attr, name))
for name, count in fcf.counts.items():
if name in fields:
if count > 1:
local_fail(True)
else:
local_fail(False)
for name in fields:
if fcf.counts.get(name) != 1:
local_fail(True)
assert_only_one('start_line')
assert_only_one('stop_line')
field = "arguments" if "{arguments}" in self.checksum_line else "checksum"
assert_only_one('checksum_line', field)
class PythonLanguage(Language):
language = 'Python'
start_line = "#/*[{dsl_name} input]"
body_prefix = "#"
stop_line = "#[{dsl_name} start generated code]*/"
checksum_line = "#/*[{dsl_name} end generated code: {arguments}]*/"
ParamTuple = tuple["Parameter", ...]
def permute_left_option_groups(
l: Sequence[Iterable[Parameter]]
) -> Iterator[ParamTuple]:
"""
Given [(1,), (2,), (3,)], should yield:
()
(3,)
(2, 3)
(1, 2, 3)
"""
yield tuple()
accumulator: list[Parameter] = []
for group in reversed(l):
accumulator = list(group) + accumulator
yield tuple(accumulator)
def permute_right_option_groups(
l: Sequence[Iterable[Parameter]]
) -> Iterator[ParamTuple]:
"""
Given [(1,), (2,), (3,)], should yield:
()
(1,)
(1, 2)
(1, 2, 3)
"""
yield tuple()
accumulator: list[Parameter] = []
for group in l:
accumulator.extend(group)
yield tuple(accumulator)
def permute_optional_groups(
left: Sequence[Iterable[Parameter]],
required: Iterable[Parameter],
right: Sequence[Iterable[Parameter]]
) -> tuple[ParamTuple, ...]:
"""
Generator function that computes the set of acceptable
argument lists for the provided iterables of
argument groups. (Actually it generates a tuple of tuples.)
Algorithm: prefer left options over right options.
If required is empty, left must also be empty.
"""
required = tuple(required)
if not required:
if left:
raise ValueError("required is empty but left is not")
accumulator: list[ParamTuple] = []
counts = set()
for r in permute_right_option_groups(right):
for l in permute_left_option_groups(left):
t = l + required + r
if len(t) in counts:
continue
counts.add(len(t))
accumulator.append(t)
accumulator.sort(key=len)
return tuple(accumulator)
def strip_leading_and_trailing_blank_lines(s: str) -> str:
lines = s.rstrip().split('\n')
while lines:
line = lines[0]
if line.strip():
break
del lines[0]
return '\n'.join(lines)
@functools.lru_cache()
def normalize_snippet(
s: str,
*,
indent: int = 0
) -> str:
"""
Reformats s:
* removes leading and trailing blank lines
* ensures that it does not end with a newline
* dedents so the first nonwhite character on any line is at column "indent"
"""
s = strip_leading_and_trailing_blank_lines(s)
s = textwrap.dedent(s)
if indent:
s = textwrap.indent(s, ' ' * indent)
return s
def declare_parser(
f: Function,
*,
hasformat: bool = False
) -> str:
"""
Generates the code template for a static local PyArg_Parser variable,
with an initializer. For core code (incl. builtin modules) the
kwtuple field is also statically initialized. Otherwise
it is initialized at runtime.
"""
if hasformat:
fname = ''
format_ = '.format = "{format_units}:{name}",'
else:
fname = '.fname = "{name}",'
format_ = ''
num_keywords = len([
p for p in f.parameters.values()
if not p.is_positional_only() and not p.is_vararg()
])
if num_keywords == 0:
declarations = """
#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
# define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
#else
# define KWTUPLE NULL
#endif
"""
else:
declarations = """
#if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
#define NUM_KEYWORDS %d
static struct {{
PyGC_Head _this_is_not_used;
PyObject_VAR_HEAD
PyObject *ob_item[NUM_KEYWORDS];
}} _kwtuple = {{
.ob_base = PyVarObject_HEAD_INIT(&PyTuple_Type, NUM_KEYWORDS)
.ob_item = {{ {keywords_py} }},
}};
#undef NUM_KEYWORDS
#define KWTUPLE (&_kwtuple.ob_base.ob_base)
#else // !Py_BUILD_CORE
# define KWTUPLE NULL
#endif // !Py_BUILD_CORE
""" % num_keywords
declarations += """
static const char * const _keywords[] = {{{keywords_c} NULL}};
static _PyArg_Parser _parser = {{
.keywords = _keywords,
%s
.kwtuple = KWTUPLE,
}};
#undef KWTUPLE
""" % (format_ or fname)
return normalize_snippet(declarations)
def wrap_declarations(
text: str,
length: int = 78
) -> str:
"""
A simple-minded text wrapper for C function declarations.
It views a declaration line as looking like this:
xxxxxxxx(xxxxxxxxx,xxxxxxxxx)
If called with length=30, it would wrap that line into
xxxxxxxx(xxxxxxxxx,
xxxxxxxxx)
(If the declaration has zero or one parameters, this
function won't wrap it.)
If this doesn't work properly, it's probably better to
start from scratch with a more sophisticated algorithm,
rather than try and improve/debug this dumb little function.
"""
lines = []
for line in text.split('\n'):
prefix, _, after_l_paren = line.partition('(')
if not after_l_paren:
lines.append(line)
continue
in_paren, _, after_r_paren = after_l_paren.partition(')')
if not _:
lines.append(line)
continue
if ',' not in in_paren:
lines.append(line)
continue
parameters = [x.strip() + ", " for x in in_paren.split(',')]
prefix += "("
if len(prefix) < length:
spaces = " " * len(prefix)
else:
spaces = " " * 4
while parameters:
line = prefix
first = True
while parameters:
if (not first and
(len(line) + len(parameters[0]) > length)):
break
line += parameters.pop(0)
first = False
if not parameters:
line = line.rstrip(", ") + ")" + after_r_paren
lines.append(line.rstrip())
prefix = spaces
return "\n".join(lines)
class CLanguage(Language):
body_prefix = "#"
language = 'C'
start_line = "/*[{dsl_name} input]"
body_prefix = ""
stop_line = "[{dsl_name} start generated code]*/"
checksum_line = "/*[{dsl_name} end generated code: {arguments}]*/"
def __init__(self, filename: str) -> None:
super().__init__(filename)
self.cpp = cpp.Monitor(filename)
self.cpp.fail = fail # type: ignore[method-assign]
def parse_line(self, line: str) -> None:
self.cpp.writeline(line)
def render(
self,
clinic: Clinic | None,
signatures: Iterable[Module | Class | Function]
) -> str:
function = None
for o in signatures:
if isinstance(o, Function):
if function:
fail("You may specify at most one function per block.\nFound a block containing at least two:\n\t" + repr(function) + " and " + repr(o))
function = o
return self.render_function(clinic, function)
def docstring_for_c_string(
self,
f: Function
) -> str:
if re.search(r'[^\x00-\x7F]', f.docstring):
warn("Non-ascii character appear in docstring.")
text, add, output = _text_accumulator()
# turn docstring into a properly quoted C string
for line in f.docstring.split('\n'):
add('"')
add(quoted_for_c_string(line))
add('\\n"\n')
if text[-2] == sig_end_marker:
# If we only have a signature, add the blank line that the
# __text_signature__ getter expects to be there.
add('"\\n"')
else:
text.pop()
add('"')
return ''.join(text)
def output_templates(
self,
f: Function
) -> dict[str, str]:
parameters = list(f.parameters.values())
assert parameters
first_param = parameters.pop(0)
assert isinstance(first_param.converter, self_converter)
requires_defining_class = False
if parameters and isinstance(parameters[0].converter, defining_class_converter):
requires_defining_class = True
del parameters[0]
converters = [p.converter for p in parameters]
has_option_groups = parameters and (parameters[0].group or parameters[-1].group)
default_return_converter = (not f.return_converter or
f.return_converter.type == 'PyObject *')
new_or_init = f.kind.new_or_init
vararg: int | str = NO_VARARG
pos_only = min_pos = max_pos = min_kw_only = pseudo_args = 0
for i, p in enumerate(parameters, 1):
if p.is_keyword_only():
assert not p.is_positional_only()
if not p.is_optional():
min_kw_only = i - max_pos
elif p.is_vararg():
if vararg != NO_VARARG:
fail("Too many var args")
pseudo_args += 1
vararg = i - 1
else:
if vararg == NO_VARARG:
max_pos = i
if p.is_positional_only():
pos_only = i
if not p.is_optional():
min_pos = i
meth_o = (len(parameters) == 1 and
parameters[0].is_positional_only() and
not converters[0].is_optional() and
not requires_defining_class and
not new_or_init)
# we have to set these things before we're done:
#
# docstring_prototype
# docstring_definition
# impl_prototype
# methoddef_define
# parser_prototype
# parser_definition
# impl_definition
# cpp_if
# cpp_endif
# methoddef_ifndef
return_value_declaration = "PyObject *return_value = NULL;"
methoddef_define = normalize_snippet("""
#define {methoddef_name} \\
{{"{name}", {methoddef_cast}{c_basename}{methoddef_cast_end}, {methoddef_flags}, {c_basename}__doc__}},
""")
if new_or_init and not f.docstring:
docstring_prototype = docstring_definition = ''
else:
docstring_prototype = normalize_snippet("""
PyDoc_VAR({c_basename}__doc__);
""")
docstring_definition = normalize_snippet("""
PyDoc_STRVAR({c_basename}__doc__,
{docstring});
""")
impl_definition = normalize_snippet("""
static {impl_return_type}
{c_basename}_impl({impl_parameters})
""")
impl_prototype = parser_prototype = parser_definition = None
parser_prototype_keyword = normalize_snippet("""
static PyObject *
{c_basename}({self_type}{self_name}, PyObject *args, PyObject *kwargs)
""")
parser_prototype_varargs = normalize_snippet("""
static PyObject *
{c_basename}({self_type}{self_name}, PyObject *args)
""")
parser_prototype_fastcall = normalize_snippet("""
static PyObject *
{c_basename}({self_type}{self_name}, PyObject *const *args, Py_ssize_t nargs)
""")
parser_prototype_fastcall_keywords = normalize_snippet("""
static PyObject *
{c_basename}({self_type}{self_name}, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
""")
parser_prototype_def_class = normalize_snippet("""
static PyObject *
{c_basename}({self_type}{self_name}, PyTypeObject *{defining_class_name}, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
""")
# parser_body_fields remembers the fields passed in to the
# previous call to parser_body. this is used for an awful hack.
parser_body_fields: tuple[str, ...] = ()
def parser_body(
prototype: str,
*fields: str,
declarations: str = ''
) -> str:
nonlocal parser_body_fields
add, output = text_accumulator()
add(prototype)
parser_body_fields = fields
preamble = normalize_snippet("""
{{
{return_value_declaration}
{parser_declarations}
{declarations}
{initializers}
""") + "\n"
finale = normalize_snippet("""
{modifications}
{return_value} = {c_basename}_impl({impl_arguments});
{return_conversion}
{post_parsing}
{exit_label}
{cleanup}
return return_value;
}}
""")
for field in preamble, *fields, finale:
add('\n')
add(field)
return linear_format(output(), parser_declarations=declarations)
parsearg: str | None
if not parameters:
parser_code: list[str] | None
if not requires_defining_class:
# no parameters, METH_NOARGS
flags = "METH_NOARGS"
parser_prototype = normalize_snippet("""
static PyObject *
{c_basename}({self_type}{self_name}, PyObject *Py_UNUSED(ignored))
""")
parser_code = []
else:
assert not new_or_init
flags = "METH_METHOD|METH_FASTCALL|METH_KEYWORDS"
parser_prototype = parser_prototype_def_class
return_error = ('return NULL;' if default_return_converter
else 'goto exit;')
parser_code = [normalize_snippet("""
if (nargs) {{
PyErr_SetString(PyExc_TypeError, "{name}() takes no arguments");
%s
}}
""" % return_error, indent=4)]
if default_return_converter:
parser_definition = '\n'.join([
parser_prototype,
'{{',
*parser_code,
' return {c_basename}_impl({impl_arguments});',
'}}'])
else:
parser_definition = parser_body(parser_prototype, *parser_code)
elif meth_o:
flags = "METH_O"
if (isinstance(converters[0], object_converter) and
converters[0].format_unit == 'O'):
meth_o_prototype = normalize_snippet("""
static PyObject *
{c_basename}({impl_parameters})
""")
if default_return_converter:
# maps perfectly to METH_O, doesn't need a return converter.
# so we skip making a parse function
# and call directly into the impl function.
impl_prototype = parser_prototype = parser_definition = ''