Improve requirements and environment markers parsing (#44)

poetry/core/_vendor/lark-parser.LICENSE

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+Copyright © 2017 Erez Shinan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+

poetry/core/_vendor/lark/__init__.py

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+from .tree import Tree
+from .visitors import Transformer, Visitor, v_args, Discard
+from .visitors import InlineTransformer, inline_args   # XXX Deprecated
+from .exceptions import (ParseError, LexError, GrammarError, UnexpectedToken,
+                         UnexpectedInput, UnexpectedCharacters, LarkError)
+from .lexer import Token
+from .lark import Lark
+
+__version__ = "0.9.0"

poetry/core/_vendor/lark/__pyinstaller/__init__.py

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+# For usage of lark with PyInstaller. See https://pyinstaller-sample-hook.readthedocs.io/en/latest/index.html
+
+import os
+
+def get_hook_dirs():
+    return [os.path.dirname(__file__)]

poetry/core/_vendor/lark/__pyinstaller/hook-lark.py

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+#-----------------------------------------------------------------------------
+# Copyright (c) 2017-2020, PyInstaller Development Team.
+#
+# Distributed under the terms of the GNU General Public License (version 2
+# or later) with exception for distributing the bootloader.
+#
+# The full license is in the file COPYING.txt, distributed with this software.
+#
+# SPDX-License-Identifier: (GPL-2.0-or-later WITH Bootloader-exception)
+#-----------------------------------------------------------------------------
+
+from PyInstaller.utils.hooks import collect_data_files
+
+datas = collect_data_files('lark')

poetry/core/_vendor/lark/common.py

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+from .utils import Serialize
+from .lexer import TerminalDef
+
+###{standalone
+
+class LexerConf(Serialize):
+    __serialize_fields__ = 'tokens', 'ignore', 'g_regex_flags'
+    __serialize_namespace__ = TerminalDef,
+
+    def __init__(self, tokens, ignore=(), postlex=None, callbacks=None, g_regex_flags=0):
+        self.tokens = tokens
+        self.ignore = ignore
+        self.postlex = postlex
+        self.callbacks = callbacks or {}
+        self.g_regex_flags = g_regex_flags
+
+    def _deserialize(self):
+        self.callbacks = {} # TODO
+
+###}
+
+class ParserConf:
+    def __init__(self, rules, callbacks, start):
+        assert isinstance(start, list)
+        self.rules = rules
+        self.callbacks = callbacks
+        self.start = start
+
+

poetry/core/_vendor/lark/exceptions.py

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+from .utils import STRING_TYPE
+
+###{standalone
+class LarkError(Exception):
+    pass
+
+class GrammarError(LarkError):
+    pass
+
+class ParseError(LarkError):
+    pass
+
+class LexError(LarkError):
+    pass
+
+class UnexpectedEOF(ParseError):
+    def __init__(self, expected):
+        self.expected = expected
+
+        message = ("Unexpected end-of-input. Expected one of: \n\t* %s\n" % '\n\t* '.join(x.name for x in self.expected))
+        super(UnexpectedEOF, self).__init__(message)
+
+
+class UnexpectedInput(LarkError):
+    pos_in_stream = None
+
+    def get_context(self, text, span=40):
+        pos = self.pos_in_stream
+        start = max(pos - span, 0)
+        end = pos + span
+        before = text[start:pos].rsplit('\n', 1)[-1]
+        after = text[pos:end].split('\n', 1)[0]
+        return before + after + '\n' + ' ' * len(before) + '^\n'
+
+    def match_examples(self, parse_fn, examples, token_type_match_fallback=False):
+        """ Given a parser instance and a dictionary mapping some label with
+            some malformed syntax examples, it'll return the label for the
+            example that bests matches the current error.
+        """
+        assert self.state is not None, "Not supported for this exception"
+
+        candidate = (None, False)
+        for label, example in examples.items():
+            assert not isinstance(example, STRING_TYPE)
+
+            for malformed in example:
+                try:
+                    parse_fn(malformed)
+                except UnexpectedInput as ut:
+                    if ut.state == self.state:
+                        try:
+                            if ut.token == self.token:  # Try exact match first
+                                return label
+
+                            if token_type_match_fallback:
+                                # Fallback to token types match
+                                if (ut.token.type == self.token.type) and not candidate[-1]:
+                                    candidate = label, True
+
+                        except AttributeError:
+                            pass
+                        if not candidate[0]:
+                            candidate = label, False
+
+        return candidate[0]
+
+
+class UnexpectedCharacters(LexError, UnexpectedInput):
+    def __init__(self, seq, lex_pos, line, column, allowed=None, considered_tokens=None, state=None, token_history=None):
+        message = "No terminal defined for '%s' at line %d col %d" % (seq[lex_pos], line, column)
+
+        self.line = line
+        self.column = column
+        self.allowed = allowed
+        self.considered_tokens = considered_tokens
+        self.pos_in_stream = lex_pos
+        self.state = state
+
+        message += '\n\n' + self.get_context(seq)
+        if allowed:
+            message += '\nExpecting: %s\n' % allowed
+        if token_history:
+            message += '\nPrevious tokens: %s\n' % ', '.join(repr(t) for t in token_history)
+
+        super(UnexpectedCharacters, self).__init__(message)
+
+
+
+class UnexpectedToken(ParseError, UnexpectedInput):
+    def __init__(self, token, expected, considered_rules=None, state=None, puppet=None):
+        self.token = token
+        self.expected = expected     # XXX str shouldn't necessary
+        self.line = getattr(token, 'line', '?')
+        self.column = getattr(token, 'column', '?')
+        self.considered_rules = considered_rules
+        self.state = state
+        self.pos_in_stream = getattr(token, 'pos_in_stream', None)
+        self.puppet = puppet
+
+        message = ("Unexpected token %r at line %s, column %s.\n"
+                   "Expected one of: \n\t* %s\n"
+                   % (token, self.line, self.column, '\n\t* '.join(self.expected)))
+
+        super(UnexpectedToken, self).__init__(message)
+
+class VisitError(LarkError):
+    """VisitError is raised when visitors are interrupted by an exception
+
+    It provides the following attributes for inspection:
+    - obj: the tree node or token it was processing when the exception was raised
+    - orig_exc: the exception that cause it to fail
+    """
+    def __init__(self, rule, obj, orig_exc):
+        self.obj = obj
+        self.orig_exc = orig_exc
+
+        message = 'Error trying to process rule "%s":\n\n%s' % (rule, orig_exc)
+        super(VisitError, self).__init__(message)
+###}

poetry/core/_vendor/lark/grammar.py

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+from .utils import Serialize
+
+###{standalone
+
+class Symbol(Serialize):
+    __slots__ = ('name',)
+
+    is_term = NotImplemented
+
+    def __init__(self, name):
+        self.name = name
+
+    def __eq__(self, other):
+        assert isinstance(other, Symbol), other
+        return self.is_term == other.is_term and self.name == other.name
+
+    def __ne__(self, other):
+        return not (self == other)
+
+    def __hash__(self):
+        return hash(self.name)
+
+    def __repr__(self):
+        return '%s(%r)' % (type(self).__name__, self.name)
+
+    fullrepr = property(__repr__)
+
+
+class Terminal(Symbol):
+    __serialize_fields__ = 'name', 'filter_out'
+
+    is_term = True
+
+    def __init__(self, name, filter_out=False):
+        self.name = name
+        self.filter_out = filter_out
+
+    @property
+    def fullrepr(self):
+        return '%s(%r, %r)' % (type(self).__name__, self.name, self.filter_out)
+
+
+
+class NonTerminal(Symbol):
+    __serialize_fields__ = 'name',
+
+    is_term = False
+
+
+
+class RuleOptions(Serialize):
+    __serialize_fields__ = 'keep_all_tokens', 'expand1', 'priority', 'template_source', 'empty_indices'
+
+    def __init__(self, keep_all_tokens=False, expand1=False, priority=None, template_source=None, empty_indices=()):
+        self.keep_all_tokens = keep_all_tokens
+        self.expand1 = expand1
+        self.priority = priority
+        self.template_source = template_source
+        self.empty_indices = empty_indices
+
+    def __repr__(self):
+        return 'RuleOptions(%r, %r, %r, %r)' % (
+            self.keep_all_tokens,
+            self.expand1,
+            self.priority,
+            self.template_source
+        )
+
+
+class Rule(Serialize):
+    """
+        origin : a symbol
+        expansion : a list of symbols
+        order : index of this expansion amongst all rules of the same name
+    """
+    __slots__ = ('origin', 'expansion', 'alias', 'options', 'order', '_hash')
+
+    __serialize_fields__ = 'origin', 'expansion', 'order', 'alias', 'options'
+    __serialize_namespace__ = Terminal, NonTerminal, RuleOptions
+
+    def __init__(self, origin, expansion, order=0, alias=None, options=None):
+        self.origin = origin
+        self.expansion = expansion
+        self.alias = alias
+        self.order = order
+        self.options = options or RuleOptions()
+        self._hash = hash((self.origin, tuple(self.expansion)))
+
+    def _deserialize(self):
+        self._hash = hash((self.origin, tuple(self.expansion)))
+
+    def __str__(self):
+        return '<%s : %s>' % (self.origin.name, ' '.join(x.name for x in self.expansion))
+
+    def __repr__(self):
+        return 'Rule(%r, %r, %r, %r)' % (self.origin, self.expansion, self.alias, self.options)
+
+    def __hash__(self):
+        return self._hash
+
+    def __eq__(self, other):
+        if not isinstance(other, Rule):
+            return False
+        return self.origin == other.origin and self.expansion == other.expansion
+
+
+
+###}

poetry/core/_vendor/lark/grammars/common.lark

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+//
+// Numbers
+//
+
+DIGIT: "0".."9"
+HEXDIGIT: "a".."f"|"A".."F"|DIGIT
+
+INT: DIGIT+
+SIGNED_INT: ["+"|"-"] INT
+DECIMAL: INT "." INT? | "." INT
+
+// float = /-?\d+(\.\d+)?([eE][+-]?\d+)?/
+_EXP: ("e"|"E") SIGNED_INT
+FLOAT: INT _EXP | DECIMAL _EXP?
+SIGNED_FLOAT: ["+"|"-"] FLOAT
+
+NUMBER: FLOAT | INT
+SIGNED_NUMBER: ["+"|"-"] NUMBER
+
+//
+// Strings
+//
+_STRING_INNER: /.*?/
+_STRING_ESC_INNER: _STRING_INNER /(?<!\\)(\\\\)*?/ 
+
+ESCAPED_STRING : "\"" _STRING_ESC_INNER "\""
+
+
+//
+// Names (Variables)
+//
+LCASE_LETTER: "a".."z"
+UCASE_LETTER: "A".."Z"
+
+LETTER: UCASE_LETTER | LCASE_LETTER
+WORD: LETTER+
+
+CNAME: ("_"|LETTER) ("_"|LETTER|DIGIT)*
+
+
+//
+// Whitespace
+//
+WS_INLINE: (" "|/\t/)+
+WS: /[ \t\f\r\n]/+
+
+CR : /\r/
+LF : /\n/
+NEWLINE: (CR? LF)+
+