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__pycache__	-	Open
markers.py	8.02 MB	View DL Edit
metadata.py	16.01 MB	View DL Edit
py.typed	0 B	View DL Edit
requirements.py	3.21 MB	View DL Edit
specifiers.py	38.29 MB	View DL Edit
tags.py	17.68 MB	View DL Edit
utils.py	4.25 MB	View DL Edit
version.py	15.94 MB	View DL Edit
_elffile.py	3.19 MB	View DL Edit
_manylinux.py	8.72 MB	View DL Edit
_musllinux.py	2.46 MB	View DL Edit
_parser.py	9.96 MB	View DL Edit
_structures.py	1.4 MB	View DL Edit
_tokenizer.py	5.17 MB	View DL Edit
__init__.py	501 B	View DL Edit

Edit file: /opt/imunify360/venv/lib/python3.11/site-packages/pkg_resources/_vendor/packaging/_parser.py

"""Handwritten parser of dependency specifiers.

The docstring for each __parse_* function contains ENBF-inspired grammar representing
the implementation.
"""

import ast
from typing import Any, List, NamedTuple, Optional, Tuple, Union

from ._tokenizer import DEFAULT_RULES, Tokenizer

class Node:
    def __init__(self, value: str) -> None:
        self.value = value

def __str__(self) -> str:
        return self.value

def __repr__(self) -> str:
        return f"<{self.__class__.__name__}('{self}')>"

def serialize(self) -> str:
        raise NotImplementedError

class Variable(Node):
    def serialize(self) -> str:
        return str(self)

class Value(Node):
    def serialize(self) -> str:
        return f'"{self}"'

class Op(Node):
    def serialize(self) -> str:
        return str(self)

MarkerVar = Union[Variable, Value]
MarkerItem = Tuple[MarkerVar, Op, MarkerVar]
# MarkerAtom = Union[MarkerItem, List["MarkerAtom"]]
# MarkerList = List[Union["MarkerList", MarkerAtom, str]]
# mypy does not support recursive type definition
# https://github.com/python/mypy/issues/731
MarkerAtom = Any
MarkerList = List[Any]

class ParsedRequirement(NamedTuple):
    name: str
    url: str
    extras: List[str]
    specifier: str
    marker: Optional[MarkerList]

# --------------------------------------------------------------------------------------
# Recursive descent parser for dependency specifier
# --------------------------------------------------------------------------------------
def parse_requirement(source: str) -> ParsedRequirement:
    return _parse_requirement(Tokenizer(source, rules=DEFAULT_RULES))

def _parse_requirement(tokenizer: Tokenizer) -> ParsedRequirement:
    """
    requirement = WS? IDENTIFIER WS? extras WS? requirement_details
    """
    tokenizer.consume("WS")

name_token = tokenizer.expect(
        "IDENTIFIER", expected="package name at the start of dependency specifier"
    )
    name = name_token.text
    tokenizer.consume("WS")

extras = _parse_extras(tokenizer)
    tokenizer.consume("WS")

url, specifier, marker = _parse_requirement_details(tokenizer)
    tokenizer.expect("END", expected="end of dependency specifier")

return ParsedRequirement(name, url, extras, specifier, marker)

def _parse_requirement_details(
    tokenizer: Tokenizer,
) -> Tuple[str, str, Optional[MarkerList]]:
    """
    requirement_details = AT URL (WS requirement_marker?)?
                        | specifier WS? (requirement_marker)?
    """

specifier = ""
    url = ""
    marker = None

if tokenizer.check("AT"):
        tokenizer.read()
        tokenizer.consume("WS")

url_start = tokenizer.position
        url = tokenizer.expect("URL", expected="URL after @").text
        if tokenizer.check("END", peek=True):
            return (url, specifier, marker)

tokenizer.expect("WS", expected="whitespace after URL")

# The input might end after whitespace.
        if tokenizer.check("END", peek=True):
            return (url, specifier, marker)

marker = _parse_requirement_marker(
            tokenizer, span_start=url_start, after="URL and whitespace"
        )
    else:
        specifier_start = tokenizer.position
        specifier = _parse_specifier(tokenizer)
        tokenizer.consume("WS")

if tokenizer.check("END", peek=True):
            return (url, specifier, marker)

marker = _parse_requirement_marker(
            tokenizer,
            span_start=specifier_start,
            after=(
                "version specifier"
                if specifier
                else "name and no valid version specifier"
            ),
        )

return (url, specifier, marker)

def _parse_requirement_marker(
    tokenizer: Tokenizer, *, span_start: int, after: str
) -> MarkerList:
    """
    requirement_marker = SEMICOLON marker WS?
    """

if not tokenizer.check("SEMICOLON"):
        tokenizer.raise_syntax_error(
            f"Expected end or semicolon (after {after})",
            span_start=span_start,
        )
    tokenizer.read()

marker = _parse_marker(tokenizer)
    tokenizer.consume("WS")

return marker

def _parse_extras(tokenizer: Tokenizer) -> List[str]:
    """
    extras = (LEFT_BRACKET wsp* extras_list? wsp* RIGHT_BRACKET)?
    """
    if not tokenizer.check("LEFT_BRACKET", peek=True):
        return []

with tokenizer.enclosing_tokens(
        "LEFT_BRACKET",
        "RIGHT_BRACKET",
        around="extras",
    ):
        tokenizer.consume("WS")
        extras = _parse_extras_list(tokenizer)
        tokenizer.consume("WS")

return extras

def _parse_extras_list(tokenizer: Tokenizer) -> List[str]:
    """
    extras_list = identifier (wsp* ',' wsp* identifier)*
    """
    extras: List[str] = []

if not tokenizer.check("IDENTIFIER"):
        return extras

extras.append(tokenizer.read().text)

while True:
        tokenizer.consume("WS")
        if tokenizer.check("IDENTIFIER", peek=True):
            tokenizer.raise_syntax_error("Expected comma between extra names")
        elif not tokenizer.check("COMMA"):
            break

tokenizer.read()
        tokenizer.consume("WS")

extra_token = tokenizer.expect("IDENTIFIER", expected="extra name after comma")
        extras.append(extra_token.text)

return extras

def _parse_specifier(tokenizer: Tokenizer) -> str:
    """
    specifier = LEFT_PARENTHESIS WS? version_many WS? RIGHT_PARENTHESIS
              | WS? version_many WS?
    """
    with tokenizer.enclosing_tokens(
        "LEFT_PARENTHESIS",
        "RIGHT_PARENTHESIS",
        around="version specifier",
    ):
        tokenizer.consume("WS")
        parsed_specifiers = _parse_version_many(tokenizer)
        tokenizer.consume("WS")

return parsed_specifiers

def _parse_version_many(tokenizer: Tokenizer) -> str:
    """
    version_many = (SPECIFIER (WS? COMMA WS? SPECIFIER)*)?
    """
    parsed_specifiers = ""
    while tokenizer.check("SPECIFIER"):
        span_start = tokenizer.position
        parsed_specifiers += tokenizer.read().text
        if tokenizer.check("VERSION_PREFIX_TRAIL", peek=True):
            tokenizer.raise_syntax_error(
                ".* suffix can only be used with `==` or `!=` operators",
                span_start=span_start,
                span_end=tokenizer.position + 1,
            )
        if tokenizer.check("VERSION_LOCAL_LABEL_TRAIL", peek=True):
            tokenizer.raise_syntax_error(
                "Local version label can only be used with `==` or `!=` operators",
                span_start=span_start,
                span_end=tokenizer.position,
            )
        tokenizer.consume("WS")
        if not tokenizer.check("COMMA"):
            break
        parsed_specifiers += tokenizer.read().text
        tokenizer.consume("WS")

return parsed_specifiers

# --------------------------------------------------------------------------------------
# Recursive descent parser for marker expression
# --------------------------------------------------------------------------------------
def parse_marker(source: str) -> MarkerList:
    return _parse_marker(Tokenizer(source, rules=DEFAULT_RULES))

def _parse_marker(tokenizer: Tokenizer) -> MarkerList:
    """
    marker = marker_atom (BOOLOP marker_atom)+
    """
    expression = [_parse_marker_atom(tokenizer)]
    while tokenizer.check("BOOLOP"):
        token = tokenizer.read()
        expr_right = _parse_marker_atom(tokenizer)
        expression.extend((token.text, expr_right))
    return expression

def _parse_marker_atom(tokenizer: Tokenizer) -> MarkerAtom:
    """
    marker_atom = WS? LEFT_PARENTHESIS WS? marker WS? RIGHT_PARENTHESIS WS?
                | WS? marker_item WS?
    """

tokenizer.consume("WS")
    if tokenizer.check("LEFT_PARENTHESIS", peek=True):
        with tokenizer.enclosing_tokens(
            "LEFT_PARENTHESIS",
            "RIGHT_PARENTHESIS",
            around="marker expression",
        ):
            tokenizer.consume("WS")
            marker: MarkerAtom = _parse_marker(tokenizer)
            tokenizer.consume("WS")
    else:
        marker = _parse_marker_item(tokenizer)
    tokenizer.consume("WS")
    return marker

def _parse_marker_item(tokenizer: Tokenizer) -> MarkerItem:
    """
    marker_item = WS? marker_var WS? marker_op WS? marker_var WS?
    """
    tokenizer.consume("WS")
    marker_var_left = _parse_marker_var(tokenizer)
    tokenizer.consume("WS")
    marker_op = _parse_marker_op(tokenizer)
    tokenizer.consume("WS")
    marker_var_right = _parse_marker_var(tokenizer)
    tokenizer.consume("WS")
    return (marker_var_left, marker_op, marker_var_right)

def _parse_marker_var(tokenizer: Tokenizer) -> MarkerVar:
    """
    marker_var = VARIABLE | QUOTED_STRING
    """
    if tokenizer.check("VARIABLE"):
        return process_env_var(tokenizer.read().text.replace(".", "_"))
    elif tokenizer.check("QUOTED_STRING"):
        return process_python_str(tokenizer.read().text)
    else:
        tokenizer.raise_syntax_error(
            message="Expected a marker variable or quoted string"
        )

def process_env_var(env_var: str) -> Variable:
    if (
        env_var == "platform_python_implementation"
        or env_var == "python_implementation"
    ):
        return Variable("platform_python_implementation")
    else:
        return Variable(env_var)

def process_python_str(python_str: str) -> Value:
    value = ast.literal_eval(python_str)
    return Value(str(value))

def _parse_marker_op(tokenizer: Tokenizer) -> Op:
    """
    marker_op = IN | NOT IN | OP
    """
    if tokenizer.check("IN"):
        tokenizer.read()
        return Op("in")
    elif tokenizer.check("NOT"):
        tokenizer.read()
        tokenizer.expect("WS", expected="whitespace after 'not'")
        tokenizer.expect("IN", expected="'in' after 'not'")
        return Op("not in")
    elif tokenizer.check("OP"):
        return Op(tokenizer.read().text)
    else:
        return tokenizer.raise_syntax_error(
            "Expected marker operator, one of "
            "<=, <, !=, ==, >=, >, ~=, ===, in, not in"
        )

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