Coverage for /home/runner/.local/share/hatch/env/virtual/importnb-KA2AwMZG/test.stdlib/lib/python3.9/site-packages/importnb/_json_parser.py: 53%
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« prev ^ index » next coverage.py v6.5.0, created at 2022-10-03 22:31 +0000
« prev ^ index » next coverage.py v6.5.0, created at 2022-10-03 22:31 +0000
1# The file was automatically generated by Lark v1.1.2
2__version__ = "1.1.2"
4#
5#
6# Lark Stand-alone Generator Tool
7# ----------------------------------
8# Generates a stand-alone LALR(1) parser
9#
10# Git: https://github.com/erezsh/lark
11# Author: Erez Shinan (erezshin@gmail.com)
12#
13#
14# >>> LICENSE
15#
16# This tool and its generated code use a separate license from Lark,
17# and are subject to the terms of the Mozilla Public License, v. 2.0.
18# If a copy of the MPL was not distributed with this
19# file, You can obtain one at https://mozilla.org/MPL/2.0/.
20#
21# If you wish to purchase a commercial license for this tool and its
22# generated code, you may contact me via email or otherwise.
23#
24# If MPL2 is incompatible with your free or open-source project,
25# contact me and we'll work it out.
26#
27#
29from abc import ABC, abstractmethod
30from collections.abc import Sequence
31from types import ModuleType
32from typing import (
33 TypeVar, Generic, Type, Tuple, List, Dict, Iterator, Collection, Callable, Optional, FrozenSet, Any,
34 Union, Iterable, IO, TYPE_CHECKING,
35 Pattern as REPattern, ClassVar, Set, Mapping
36)
39class LarkError(Exception):
40 pass
43class ConfigurationError(LarkError, ValueError):
44 pass
47def assert_config(value, options: Collection, msg='Got %r, expected one of %s'):
48 if value not in options:
49 raise ConfigurationError(msg % (value, options))
52class GrammarError(LarkError):
53 pass
56class ParseError(LarkError):
57 pass
60class LexError(LarkError):
61 pass
63T = TypeVar('T')
65class UnexpectedInput(LarkError):
66 #--
67 line: int
68 column: int
69 pos_in_stream = None
70 state: Any
71 _terminals_by_name = None
73 def get_context(self, text: str, span: int=40) -> str:
74 #--
75 assert self.pos_in_stream is not None, self
76 pos = self.pos_in_stream
77 start = max(pos - span, 0)
78 end = pos + span
79 if not isinstance(text, bytes):
80 before = text[start:pos].rsplit('\n', 1)[-1]
81 after = text[pos:end].split('\n', 1)[0]
82 return before + after + '\n' + ' ' * len(before.expandtabs()) + '^\n'
83 else:
84 before = text[start:pos].rsplit(b'\n', 1)[-1]
85 after = text[pos:end].split(b'\n', 1)[0]
86 return (before + after + b'\n' + b' ' * len(before.expandtabs()) + b'^\n').decode("ascii", "backslashreplace")
88 def match_examples(self, parse_fn: 'Callable[[str], Tree]',
89 examples: Union[Mapping[T, Iterable[str]], Iterable[Tuple[T, Iterable[str]]]],
90 token_type_match_fallback: bool=False,
91 use_accepts: bool=True
92 ) -> Optional[T]:
93 #--
94 assert self.state is not None, "Not supported for this exception"
96 if isinstance(examples, Mapping):
97 examples = examples.items()
99 candidate = (None, False)
100 for i, (label, example) in enumerate(examples):
101 assert not isinstance(example, str), "Expecting a list"
103 for j, malformed in enumerate(example):
104 try:
105 parse_fn(malformed)
106 except UnexpectedInput as ut:
107 if ut.state == self.state:
108 if (
109 use_accepts
110 and isinstance(self, UnexpectedToken)
111 and isinstance(ut, UnexpectedToken)
112 and ut.accepts != self.accepts
113 ):
114 logger.debug("Different accepts with same state[%d]: %s != %s at example [%s][%s]" %
115 (self.state, self.accepts, ut.accepts, i, j))
116 continue
117 if (
118 isinstance(self, (UnexpectedToken, UnexpectedEOF))
119 and isinstance(ut, (UnexpectedToken, UnexpectedEOF))
120 ):
121 if ut.token == self.token: ##
123 logger.debug("Exact Match at example [%s][%s]" % (i, j))
124 return label
126 if token_type_match_fallback:
127 ##
129 if (ut.token.type == self.token.type) and not candidate[-1]:
130 logger.debug("Token Type Fallback at example [%s][%s]" % (i, j))
131 candidate = label, True
133 if candidate[0] is None:
134 logger.debug("Same State match at example [%s][%s]" % (i, j))
135 candidate = label, False
137 return candidate[0]
139 def _format_expected(self, expected):
140 if self._terminals_by_name:
141 d = self._terminals_by_name
142 expected = [d[t_name].user_repr() if t_name in d else t_name for t_name in expected]
143 return "Expected one of: \n\t* %s\n" % '\n\t* '.join(expected)
146class UnexpectedEOF(ParseError, UnexpectedInput):
147 #--
148 expected: 'List[Token]'
150 def __init__(self, expected, state=None, terminals_by_name=None):
151 super(UnexpectedEOF, self).__init__()
153 self.expected = expected
154 self.state = state
155 from .lexer import Token
156 self.token = Token("<EOF>", "") ##
158 self.pos_in_stream = -1
159 self.line = -1
160 self.column = -1
161 self._terminals_by_name = terminals_by_name
164 def __str__(self):
165 message = "Unexpected end-of-input. "
166 message += self._format_expected(self.expected)
167 return message
170class UnexpectedCharacters(LexError, UnexpectedInput):
171 #--
173 allowed: Set[str]
174 considered_tokens: Set[Any]
176 def __init__(self, seq, lex_pos, line, column, allowed=None, considered_tokens=None, state=None, token_history=None,
177 terminals_by_name=None, considered_rules=None):
178 super(UnexpectedCharacters, self).__init__()
180 ##
182 self.line = line
183 self.column = column
184 self.pos_in_stream = lex_pos
185 self.state = state
186 self._terminals_by_name = terminals_by_name
188 self.allowed = allowed
189 self.considered_tokens = considered_tokens
190 self.considered_rules = considered_rules
191 self.token_history = token_history
193 if isinstance(seq, bytes):
194 self.char = seq[lex_pos:lex_pos + 1].decode("ascii", "backslashreplace")
195 else:
196 self.char = seq[lex_pos]
197 self._context = self.get_context(seq)
200 def __str__(self):
201 message = "No terminal matches '%s' in the current parser context, at line %d col %d" % (self.char, self.line, self.column)
202 message += '\n\n' + self._context
203 if self.allowed:
204 message += self._format_expected(self.allowed)
205 if self.token_history:
206 message += '\nPrevious tokens: %s\n' % ', '.join(repr(t) for t in self.token_history)
207 return message
210class UnexpectedToken(ParseError, UnexpectedInput):
211 #--
213 expected: Set[str]
214 considered_rules: Set[str]
215 interactive_parser: 'InteractiveParser'
217 def __init__(self, token, expected, considered_rules=None, state=None, interactive_parser=None, terminals_by_name=None, token_history=None):
218 super(UnexpectedToken, self).__init__()
220 ##
222 self.line = getattr(token, 'line', '?')
223 self.column = getattr(token, 'column', '?')
224 self.pos_in_stream = getattr(token, 'start_pos', None)
225 self.state = state
227 self.token = token
228 self.expected = expected ##
230 self._accepts = NO_VALUE
231 self.considered_rules = considered_rules
232 self.interactive_parser = interactive_parser
233 self._terminals_by_name = terminals_by_name
234 self.token_history = token_history
237 @property
238 def accepts(self) -> Set[str]:
239 if self._accepts is NO_VALUE:
240 self._accepts = self.interactive_parser and self.interactive_parser.accepts()
241 return self._accepts
243 def __str__(self):
244 message = ("Unexpected token %r at line %s, column %s.\n%s"
245 % (self.token, self.line, self.column, self._format_expected(self.accepts or self.expected)))
246 if self.token_history:
247 message += "Previous tokens: %r\n" % self.token_history
249 return message
253class VisitError(LarkError):
254 #--
256 obj: 'Union[Tree, Token]'
257 orig_exc: Exception
259 def __init__(self, rule, obj, orig_exc):
260 message = 'Error trying to process rule "%s":\n\n%s' % (rule, orig_exc)
261 super(VisitError, self).__init__(message)
263 self.rule = rule
264 self.obj = obj
265 self.orig_exc = orig_exc
268class MissingVariableError(LarkError):
269 pass
272import sys, re
273import logging
274logger: logging.Logger = logging.getLogger("lark")
275logger.addHandler(logging.StreamHandler())
276##
278##
280logger.setLevel(logging.CRITICAL)
283NO_VALUE = object()
286def classify(seq, key=None, value=None):
287 d = {}
288 for item in seq:
289 k = key(item) if (key is not None) else item
290 v = value(item) if (value is not None) else item
291 if k in d:
292 d[k].append(v)
293 else:
294 d[k] = [v]
295 return d
298def _deserialize(data, namespace, memo):
299 if isinstance(data, dict):
300 if '__type__' in data: ##
302 class_ = namespace[data['__type__']]
303 return class_.deserialize(data, memo)
304 elif '@' in data:
305 return memo[data['@']]
306 return {key:_deserialize(value, namespace, memo) for key, value in data.items()}
307 elif isinstance(data, list):
308 return [_deserialize(value, namespace, memo) for value in data]
309 return data
312class Serialize:
313 #--
315 def memo_serialize(self, types_to_memoize):
316 memo = SerializeMemoizer(types_to_memoize)
317 return self.serialize(memo), memo.serialize()
319 def serialize(self, memo=None):
320 if memo and memo.in_types(self):
321 return {'@': memo.memoized.get(self)}
323 fields = getattr(self, '__serialize_fields__')
324 res = {f: _serialize(getattr(self, f), memo) for f in fields}
325 res['__type__'] = type(self).__name__
326 if hasattr(self, '_serialize'):
327 self._serialize(res, memo)
328 return res
330 @classmethod
331 def deserialize(cls, data, memo):
332 namespace = getattr(cls, '__serialize_namespace__', [])
333 namespace = {c.__name__:c for c in namespace}
335 fields = getattr(cls, '__serialize_fields__')
337 if '@' in data:
338 return memo[data['@']]
340 inst = cls.__new__(cls)
341 for f in fields:
342 try:
343 setattr(inst, f, _deserialize(data[f], namespace, memo))
344 except KeyError as e:
345 raise KeyError("Cannot find key for class", cls, e)
347 if hasattr(inst, '_deserialize'):
348 inst._deserialize()
350 return inst
353class SerializeMemoizer(Serialize):
354 #--
356 __serialize_fields__ = 'memoized',
358 def __init__(self, types_to_memoize):
359 self.types_to_memoize = tuple(types_to_memoize)
360 self.memoized = Enumerator()
362 def in_types(self, value):
363 return isinstance(value, self.types_to_memoize)
365 def serialize(self):
366 return _serialize(self.memoized.reversed(), None)
368 @classmethod
369 def deserialize(cls, data, namespace, memo):
370 return _deserialize(data, namespace, memo)
373try:
374 import regex ##
376except ImportError:
377 regex = None
379import sre_parse
380import sre_constants
381categ_pattern = re.compile(r'\\p{[A-Za-z_]+}')
383def get_regexp_width(expr):
384 if regex:
385 ##
387 ##
389 ##
391 regexp_final = re.sub(categ_pattern, 'A', expr)
392 else:
393 if re.search(categ_pattern, expr):
394 raise ImportError('`regex` module must be installed in order to use Unicode categories.', expr)
395 regexp_final = expr
396 try:
397 return [int(x) for x in sre_parse.parse(regexp_final).getwidth()]
398 except sre_constants.error:
399 if not regex:
400 raise ValueError(expr)
401 else:
402 ##
404 ##
406 c = regex.compile(regexp_final)
407 if c.match('') is None:
408 ##
410 return 1, int(sre_constants.MAXREPEAT)
411 else:
412 return 0, int(sre_constants.MAXREPEAT)
415from collections import OrderedDict
417class Meta:
419 empty: bool
420 line: int
421 column: int
422 start_pos: int
423 end_line: int
424 end_column: int
425 end_pos: int
426 orig_expansion: 'List[TerminalDef]'
427 match_tree: bool
429 def __init__(self):
430 self.empty = True
433_Leaf_T = TypeVar("_Leaf_T")
434Branch = Union[_Leaf_T, 'Tree[_Leaf_T]']
437class Tree(Generic[_Leaf_T]):
438 #--
440 data: str
441 children: 'List[Branch[_Leaf_T]]'
443 def __init__(self, data: str, children: 'List[Branch[_Leaf_T]]', meta: Optional[Meta]=None) -> None:
444 self.data = data
445 self.children = children
446 self._meta = meta
448 @property
449 def meta(self) -> Meta:
450 if self._meta is None:
451 self._meta = Meta()
452 return self._meta
454 def __repr__(self):
455 return 'Tree(%r, %r)' % (self.data, self.children)
457 def _pretty_label(self):
458 return self.data
460 def _pretty(self, level, indent_str):
461 if len(self.children) == 1 and not isinstance(self.children[0], Tree):
462 return [indent_str*level, self._pretty_label(), '\t', '%s' % (self.children[0],), '\n']
464 l = [indent_str*level, self._pretty_label(), '\n']
465 for n in self.children:
466 if isinstance(n, Tree):
467 l += n._pretty(level+1, indent_str)
468 else:
469 l += [indent_str*(level+1), '%s' % (n,), '\n']
471 return l
473 def pretty(self, indent_str: str=' ') -> str:
474 #--
475 return ''.join(self._pretty(0, indent_str))
477 def __rich__(self, parent:'rich.tree.Tree'=None) -> 'rich.tree.Tree':
478 #--
479 return self._rich(parent)
481 def _rich(self, parent):
482 if parent:
483 tree = parent.add(f'[bold]{self.data}[/bold]')
484 else:
485 import rich.tree
486 tree = rich.tree.Tree(self.data)
488 for c in self.children:
489 if isinstance(c, Tree):
490 c._rich(tree)
491 else:
492 tree.add(f'[green]{c}[/green]')
494 return tree
496 def __eq__(self, other):
497 try:
498 return self.data == other.data and self.children == other.children
499 except AttributeError:
500 return False
502 def __ne__(self, other):
503 return not (self == other)
505 def __hash__(self) -> int:
506 return hash((self.data, tuple(self.children)))
508 def iter_subtrees(self) -> 'Iterator[Tree[_Leaf_T]]':
509 #--
510 queue = [self]
511 subtrees = OrderedDict()
512 for subtree in queue:
513 subtrees[id(subtree)] = subtree
514 ##
516 queue += [c for c in reversed(subtree.children) ##
518 if isinstance(c, Tree) and id(c) not in subtrees]
520 del queue
521 return reversed(list(subtrees.values()))
523 def find_pred(self, pred: 'Callable[[Tree[_Leaf_T]], bool]') -> 'Iterator[Tree[_Leaf_T]]':
524 #--
525 return filter(pred, self.iter_subtrees())
527 def find_data(self, data: str) -> 'Iterator[Tree[_Leaf_T]]':
528 #--
529 return self.find_pred(lambda t: t.data == data)
532from functools import wraps, update_wrapper
533from inspect import getmembers, getmro
535_Return_T = TypeVar('_Return_T')
536_Return_V = TypeVar('_Return_V')
537_Leaf_T = TypeVar('_Leaf_T')
538_Leaf_U = TypeVar('_Leaf_U')
539_R = TypeVar('_R')
540_FUNC = Callable[..., _Return_T]
541_DECORATED = Union[_FUNC, type]
543class _DiscardType:
544 #--
546 def __repr__(self):
547 return "lark.visitors.Discard"
549Discard = _DiscardType()
551##
554class _Decoratable:
555 #--
557 @classmethod
558 def _apply_v_args(cls, visit_wrapper):
559 mro = getmro(cls)
560 assert mro[0] is cls
561 libmembers = {name for _cls in mro[1:] for name, _ in getmembers(_cls)}
562 for name, value in getmembers(cls):
564 ##
566 if name.startswith('_') or (name in libmembers and name not in cls.__dict__):
567 continue
568 if not callable(value):
569 continue
571 ##
573 if isinstance(cls.__dict__[name], _VArgsWrapper):
574 continue
576 setattr(cls, name, _VArgsWrapper(cls.__dict__[name], visit_wrapper))
577 return cls
579 def __class_getitem__(cls, _):
580 return cls
583class Transformer(_Decoratable, ABC, Generic[_Leaf_T, _Return_T]):
584 #--
585 __visit_tokens__ = True ##
588 def __init__(self, visit_tokens: bool=True) -> None:
589 self.__visit_tokens__ = visit_tokens
591 def _call_userfunc(self, tree, new_children=None):
592 ##
594 children = new_children if new_children is not None else tree.children
595 try:
596 f = getattr(self, tree.data)
597 except AttributeError:
598 return self.__default__(tree.data, children, tree.meta)
599 else:
600 try:
601 wrapper = getattr(f, 'visit_wrapper', None)
602 if wrapper is not None:
603 return f.visit_wrapper(f, tree.data, children, tree.meta)
604 else:
605 return f(children)
606 except GrammarError:
607 raise
608 except Exception as e:
609 raise VisitError(tree.data, tree, e)
611 def _call_userfunc_token(self, token):
612 try:
613 f = getattr(self, token.type)
614 except AttributeError:
615 return self.__default_token__(token)
616 else:
617 try:
618 return f(token)
619 except GrammarError:
620 raise
621 except Exception as e:
622 raise VisitError(token.type, token, e)
624 def _transform_children(self, children):
625 for c in children:
626 if isinstance(c, Tree):
627 res = self._transform_tree(c)
628 elif self.__visit_tokens__ and isinstance(c, Token):
629 res = self._call_userfunc_token(c)
630 else:
631 res = c
633 if res is not Discard:
634 yield res
636 def _transform_tree(self, tree):
637 children = list(self._transform_children(tree.children))
638 return self._call_userfunc(tree, children)
640 def transform(self, tree: Tree[_Leaf_T]) -> _Return_T:
641 #--
642 return self._transform_tree(tree)
644 def __mul__(
645 self: 'Transformer[_Leaf_T, Tree[_Leaf_U]]',
646 other: 'Union[Transformer[_Leaf_U, _Return_V], TransformerChain[_Leaf_U, _Return_V,]]'
647 ) -> 'TransformerChain[_Leaf_T, _Return_V]':
648 #--
649 return TransformerChain(self, other)
651 def __default__(self, data, children, meta):
652 #--
653 return Tree(data, children, meta)
655 def __default_token__(self, token):
656 #--
657 return token
660def merge_transformers(base_transformer=None, **transformers_to_merge):
661 #--
662 if base_transformer is None:
663 base_transformer = Transformer()
664 for prefix, transformer in transformers_to_merge.items():
665 for method_name in dir(transformer):
666 method = getattr(transformer, method_name)
667 if not callable(method):
668 continue
669 if method_name.startswith("_") or method_name == "transform":
670 continue
671 prefixed_method = prefix + "__" + method_name
672 if hasattr(base_transformer, prefixed_method):
673 raise AttributeError("Cannot merge: method '%s' appears more than once" % prefixed_method)
675 setattr(base_transformer, prefixed_method, method)
677 return base_transformer
680class InlineTransformer(Transformer): ##
682 def _call_userfunc(self, tree, new_children=None):
683 ##
685 children = new_children if new_children is not None else tree.children
686 try:
687 f = getattr(self, tree.data)
688 except AttributeError:
689 return self.__default__(tree.data, children, tree.meta)
690 else:
691 return f(*children)
694class TransformerChain(Generic[_Leaf_T, _Return_T]):
696 transformers: 'Tuple[Union[Transformer, TransformerChain], ...]'
698 def __init__(self, *transformers: 'Union[Transformer, TransformerChain]') -> None:
699 self.transformers = transformers
701 def transform(self, tree: Tree[_Leaf_T]) -> _Return_T:
702 for t in self.transformers:
703 tree = t.transform(tree)
704 return cast(_Return_T, tree)
706 def __mul__(
707 self: 'TransformerChain[_Leaf_T, Tree[_Leaf_U]]',
708 other: 'Union[Transformer[_Leaf_U, _Return_V], TransformerChain[_Leaf_U, _Return_V]]'
709 ) -> 'TransformerChain[_Leaf_T, _Return_V]':
710 return TransformerChain(*self.transformers + (other,))
713class Transformer_InPlace(Transformer):
714 #--
715 def _transform_tree(self, tree): ##
717 return self._call_userfunc(tree)
719 def transform(self, tree: Tree[_Leaf_T]) -> _Return_T:
720 for subtree in tree.iter_subtrees():
721 subtree.children = list(self._transform_children(subtree.children))
723 return self._transform_tree(tree)
726class Transformer_NonRecursive(Transformer):
727 #--
729 def transform(self, tree: Tree[_Leaf_T]) -> _Return_T:
730 ##
732 rev_postfix = []
733 q: List[Branch[_Leaf_T]] = [tree]
734 while q:
735 t = q.pop()
736 rev_postfix.append(t)
737 if isinstance(t, Tree):
738 q += t.children
740 ##
742 stack: List = []
743 for x in reversed(rev_postfix):
744 if isinstance(x, Tree):
745 size = len(x.children)
746 if size:
747 args = stack[-size:]
748 del stack[-size:]
749 else:
750 args = []
752 res = self._call_userfunc(x, args)
753 if res is not Discard:
754 stack.append(res)
756 elif self.__visit_tokens__ and isinstance(x, Token):
757 res = self._call_userfunc_token(x)
758 if res is not Discard:
759 stack.append(res)
760 else:
761 stack.append(x)
763 result, = stack ##
765 ##
767 ##
769 ##
771 return cast(_Return_T, result)
774class Transformer_InPlaceRecursive(Transformer):
775 #--
776 def _transform_tree(self, tree):
777 tree.children = list(self._transform_children(tree.children))
778 return self._call_userfunc(tree)
781##
784class VisitorBase:
785 def _call_userfunc(self, tree):
786 return getattr(self, tree.data, self.__default__)(tree)
788 def __default__(self, tree):
789 #--
790 return tree
792 def __class_getitem__(cls, _):
793 return cls
796class Visitor(VisitorBase, ABC, Generic[_Leaf_T]):
797 #--
799 def visit(self, tree: Tree[_Leaf_T]) -> Tree[_Leaf_T]:
800 #--
801 for subtree in tree.iter_subtrees():
802 self._call_userfunc(subtree)
803 return tree
805 def visit_topdown(self, tree: Tree[_Leaf_T]) -> Tree[_Leaf_T]:
806 #--
807 for subtree in tree.iter_subtrees_topdown():
808 self._call_userfunc(subtree)
809 return tree
812class Visitor_Recursive(VisitorBase, Generic[_Leaf_T]):
813 #--
815 def visit(self, tree: Tree[_Leaf_T]) -> Tree[_Leaf_T]:
816 #--
817 for child in tree.children:
818 if isinstance(child, Tree):
819 self.visit(child)
821 self._call_userfunc(tree)
822 return tree
824 def visit_topdown(self,tree: Tree[_Leaf_T]) -> Tree[_Leaf_T]:
825 #--
826 self._call_userfunc(tree)
828 for child in tree.children:
829 if isinstance(child, Tree):
830 self.visit_topdown(child)
832 return tree
835class Interpreter(_Decoratable, ABC, Generic[_Leaf_T, _Return_T]):
836 #--
838 def visit(self, tree: Tree[_Leaf_T]) -> _Return_T:
839 ##
841 ##
843 ##
845 return self._visit_tree(tree)
847 def _visit_tree(self, tree: Tree[_Leaf_T]):
848 f = getattr(self, tree.data)
849 wrapper = getattr(f, 'visit_wrapper', None)
850 if wrapper is not None:
851 return f.visit_wrapper(f, tree.data, tree.children, tree.meta)
852 else:
853 return f(tree)
855 def visit_children(self, tree: Tree[_Leaf_T]) -> List:
856 return [self._visit_tree(child) if isinstance(child, Tree) else child
857 for child in tree.children]
859 def __getattr__(self, name):
860 return self.__default__
862 def __default__(self, tree):
863 return self.visit_children(tree)
866_InterMethod = Callable[[Type[Interpreter], _Return_T], _R]
868def visit_children_decor(func: _InterMethod) -> _InterMethod:
869 #--
870 @wraps(func)
871 def inner(cls, tree):
872 values = cls.visit_children(tree)
873 return func(cls, values)
874 return inner
876##
879def _apply_v_args(obj, visit_wrapper):
880 try:
881 _apply = obj._apply_v_args
882 except AttributeError:
883 return _VArgsWrapper(obj, visit_wrapper)
884 else:
885 return _apply(visit_wrapper)
888class _VArgsWrapper:
889 #--
890 base_func: Callable
892 def __init__(self, func: Callable, visit_wrapper: Callable[[Callable, str, list, Any], Any]):
893 if isinstance(func, _VArgsWrapper):
894 func = func.base_func
895 ##
897 self.base_func = func ##
899 self.visit_wrapper = visit_wrapper
900 update_wrapper(self, func)
902 def __call__(self, *args, **kwargs):
903 return self.base_func(*args, **kwargs)
905 def __get__(self, instance, owner=None):
906 try:
907 g = self.base_func.__get__
908 except AttributeError:
909 return self
910 else:
911 return _VArgsWrapper(g(instance, owner), self.visit_wrapper)
913 def __set_name__(self, owner, name):
914 try:
915 f = self.base_func.__set_name__
916 except AttributeError:
917 return
918 else:
919 f(owner, name)
922def _vargs_inline(f, _data, children, _meta):
923 return f(*children)
924def _vargs_meta_inline(f, _data, children, meta):
925 return f(meta, *children)
926def _vargs_meta(f, _data, children, meta):
927 return f(meta, children)
928def _vargs_tree(f, data, children, meta):
929 return f(Tree(data, children, meta))
932def v_args(inline: bool = False, meta: bool = False, tree: bool = False, wrapper: Optional[Callable] = None) -> Callable[[_DECORATED], _DECORATED]:
933 #--
934 if tree and (meta or inline):
935 raise ValueError("Visitor functions cannot combine 'tree' with 'meta' or 'inline'.")
937 func = None
938 if meta:
939 if inline:
940 func = _vargs_meta_inline
941 else:
942 func = _vargs_meta
943 elif inline:
944 func = _vargs_inline
945 elif tree:
946 func = _vargs_tree
948 if wrapper is not None:
949 if func is not None:
950 raise ValueError("Cannot use 'wrapper' along with 'tree', 'meta' or 'inline'.")
951 func = wrapper
953 def _visitor_args_dec(obj):
954 return _apply_v_args(obj, func)
955 return _visitor_args_dec
959TOKEN_DEFAULT_PRIORITY = 0
962class Symbol(Serialize):
963 __slots__ = ('name',)
965 name: str
966 is_term: ClassVar[bool] = NotImplemented
968 def __init__(self, name: str) -> None:
969 self.name = name
971 def __eq__(self, other):
972 assert isinstance(other, Symbol), other
973 return self.is_term == other.is_term and self.name == other.name
975 def __ne__(self, other):
976 return not (self == other)
978 def __hash__(self):
979 return hash(self.name)
981 def __repr__(self):
982 return '%s(%r)' % (type(self).__name__, self.name)
984 fullrepr = property(__repr__)
986 def renamed(self, f):
987 return type(self)(f(self.name))
990class Terminal(Symbol):
991 __serialize_fields__ = 'name', 'filter_out'
993 is_term: ClassVar[bool] = True
995 def __init__(self, name, filter_out=False):
996 self.name = name
997 self.filter_out = filter_out
999 @property
1000 def fullrepr(self):
1001 return '%s(%r, %r)' % (type(self).__name__, self.name, self.filter_out)
1003 def renamed(self, f):
1004 return type(self)(f(self.name), self.filter_out)
1007class NonTerminal(Symbol):
1008 __serialize_fields__ = 'name',
1010 is_term: ClassVar[bool] = False
1013class RuleOptions(Serialize):
1014 __serialize_fields__ = 'keep_all_tokens', 'expand1', 'priority', 'template_source', 'empty_indices'
1016 keep_all_tokens: bool
1017 expand1: bool
1018 priority: Optional[int]
1019 template_source: Optional[str]
1020 empty_indices: Tuple[bool, ...]
1022 def __init__(self, keep_all_tokens: bool=False, expand1: bool=False, priority: Optional[int]=None, template_source: Optional[str]=None, empty_indices: Tuple[bool, ...]=()) -> None:
1023 self.keep_all_tokens = keep_all_tokens
1024 self.expand1 = expand1
1025 self.priority = priority
1026 self.template_source = template_source
1027 self.empty_indices = empty_indices
1029 def __repr__(self):
1030 return 'RuleOptions(%r, %r, %r, %r)' % (
1031 self.keep_all_tokens,
1032 self.expand1,
1033 self.priority,
1034 self.template_source
1035 )
1038class Rule(Serialize):
1039 #--
1040 __slots__ = ('origin', 'expansion', 'alias', 'options', 'order', '_hash')
1042 __serialize_fields__ = 'origin', 'expansion', 'order', 'alias', 'options'
1043 __serialize_namespace__ = Terminal, NonTerminal, RuleOptions
1045 def __init__(self, origin, expansion, order=0, alias=None, options=None):
1046 self.origin = origin
1047 self.expansion = expansion
1048 self.alias = alias
1049 self.order = order
1050 self.options = options or RuleOptions()
1051 self._hash = hash((self.origin, tuple(self.expansion)))
1053 def _deserialize(self):
1054 self._hash = hash((self.origin, tuple(self.expansion)))
1056 def __str__(self):
1057 return '<%s : %s>' % (self.origin.name, ' '.join(x.name for x in self.expansion))
1059 def __repr__(self):
1060 return 'Rule(%r, %r, %r, %r)' % (self.origin, self.expansion, self.alias, self.options)
1062 def __hash__(self):
1063 return self._hash
1065 def __eq__(self, other):
1066 if not isinstance(other, Rule):
1067 return False
1068 return self.origin == other.origin and self.expansion == other.expansion
1072from copy import copy
1075class Pattern(Serialize, ABC):
1077 value: str
1078 flags: Collection[str]
1079 raw: Optional[str]
1080 type: ClassVar[str]
1082 def __init__(self, value: str, flags: Collection[str]=(), raw: Optional[str]=None) -> None:
1083 self.value = value
1084 self.flags = frozenset(flags)
1085 self.raw = raw
1087 def __repr__(self):
1088 return repr(self.to_regexp())
1090 ##
1092 def __hash__(self):
1093 return hash((type(self), self.value, self.flags))
1095 def __eq__(self, other):
1096 return type(self) == type(other) and self.value == other.value and self.flags == other.flags
1098 @abstractmethod
1099 def to_regexp(self) -> str:
1100 raise NotImplementedError()
1102 @property
1103 @abstractmethod
1104 def min_width(self) -> int:
1105 raise NotImplementedError()
1107 @property
1108 @abstractmethod
1109 def max_width(self) -> int:
1110 raise NotImplementedError()
1112 def _get_flags(self, value):
1113 for f in self.flags:
1114 value = ('(?%s:%s)' % (f, value))
1115 return value
1118class PatternStr(Pattern):
1119 __serialize_fields__ = 'value', 'flags'
1121 type: ClassVar[str] = "str"
1123 def to_regexp(self) -> str:
1124 return self._get_flags(re.escape(self.value))
1126 @property
1127 def min_width(self) -> int:
1128 return len(self.value)
1130 @property
1131 def max_width(self) -> int:
1132 return len(self.value)
1135class PatternRE(Pattern):
1136 __serialize_fields__ = 'value', 'flags', '_width'
1138 type: ClassVar[str] = "re"
1140 def to_regexp(self) -> str:
1141 return self._get_flags(self.value)
1143 _width = None
1144 def _get_width(self):
1145 if self._width is None:
1146 self._width = get_regexp_width(self.to_regexp())
1147 return self._width
1149 @property
1150 def min_width(self) -> int:
1151 return self._get_width()[0]
1153 @property
1154 def max_width(self) -> int:
1155 return self._get_width()[1]
1158class TerminalDef(Serialize):
1159 __serialize_fields__ = 'name', 'pattern', 'priority'
1160 __serialize_namespace__ = PatternStr, PatternRE
1162 name: str
1163 pattern: Pattern
1164 priority: int
1166 def __init__(self, name: str, pattern: Pattern, priority: int=TOKEN_DEFAULT_PRIORITY) -> None:
1167 assert isinstance(pattern, Pattern), pattern
1168 self.name = name
1169 self.pattern = pattern
1170 self.priority = priority
1172 def __repr__(self):
1173 return '%s(%r, %r)' % (type(self).__name__, self.name, self.pattern)
1175 def user_repr(self) -> str:
1176 if self.name.startswith('__'): ##
1178 return self.pattern.raw or self.name
1179 else:
1180 return self.name
1182_T = TypeVar('_T', bound="Token")
1184class Token(str):
1185 #--
1186 __slots__ = ('type', 'start_pos', 'value', 'line', 'column', 'end_line', 'end_column', 'end_pos')
1188 type: str
1189 start_pos: int
1190 value: Any
1191 line: int
1192 column: int
1193 end_line: int
1194 end_column: int
1195 end_pos: int
1197 def __new__(cls, type_, value, start_pos=None, line=None, column=None, end_line=None, end_column=None, end_pos=None):
1198 inst = super(Token, cls).__new__(cls, value)
1199 inst.type = type_
1200 inst.start_pos = start_pos
1201 inst.value = value
1202 inst.line = line
1203 inst.column = column
1204 inst.end_line = end_line
1205 inst.end_column = end_column
1206 inst.end_pos = end_pos
1207 return inst
1209 def update(self, type_: Optional[str]=None, value: Optional[Any]=None) -> 'Token':
1210 return Token.new_borrow_pos(
1211 type_ if type_ is not None else self.type,
1212 value if value is not None else self.value,
1213 self
1214 )
1216 @classmethod
1217 def new_borrow_pos(cls: Type[_T], type_: str, value: Any, borrow_t: 'Token') -> _T:
1218 return cls(type_, value, borrow_t.start_pos, borrow_t.line, borrow_t.column, borrow_t.end_line, borrow_t.end_column, borrow_t.end_pos)
1220 def __reduce__(self):
1221 return (self.__class__, (self.type, self.value, self.start_pos, self.line, self.column))
1223 def __repr__(self):
1224 return 'Token(%r, %r)' % (self.type, self.value)
1226 def __deepcopy__(self, memo):
1227 return Token(self.type, self.value, self.start_pos, self.line, self.column)
1229 def __eq__(self, other):
1230 if isinstance(other, Token) and self.type != other.type:
1231 return False
1233 return str.__eq__(self, other)
1235 __hash__ = str.__hash__
1238class LineCounter:
1239 __slots__ = 'char_pos', 'line', 'column', 'line_start_pos', 'newline_char'
1241 def __init__(self, newline_char):
1242 self.newline_char = newline_char
1243 self.char_pos = 0
1244 self.line = 1
1245 self.column = 1
1246 self.line_start_pos = 0
1248 def __eq__(self, other):
1249 if not isinstance(other, LineCounter):
1250 return NotImplemented
1252 return self.char_pos == other.char_pos and self.newline_char == other.newline_char
1254 def feed(self, token: Token, test_newline=True):
1255 #--
1256 if test_newline:
1257 newlines = token.count(self.newline_char)
1258 if newlines:
1259 self.line += newlines
1260 self.line_start_pos = self.char_pos + token.rindex(self.newline_char) + 1
1262 self.char_pos += len(token)
1263 self.column = self.char_pos - self.line_start_pos + 1
1266class UnlessCallback:
1267 def __init__(self, scanner):
1268 self.scanner = scanner
1270 def __call__(self, t):
1271 res = self.scanner.match(t.value, 0)
1272 if res:
1273 _value, t.type = res
1274 return t
1277class CallChain:
1278 def __init__(self, callback1, callback2, cond):
1279 self.callback1 = callback1
1280 self.callback2 = callback2
1281 self.cond = cond
1283 def __call__(self, t):
1284 t2 = self.callback1(t)
1285 return self.callback2(t) if self.cond(t2) else t2
1288def _get_match(re_, regexp, s, flags):
1289 m = re_.match(regexp, s, flags)
1290 if m:
1291 return m.group(0)
1293def _create_unless(terminals, g_regex_flags, re_, use_bytes):
1294 tokens_by_type = classify(terminals, lambda t: type(t.pattern))
1295 assert len(tokens_by_type) <= 2, tokens_by_type.keys()
1296 embedded_strs = set()
1297 callback = {}
1298 for retok in tokens_by_type.get(PatternRE, []):
1299 unless = []
1300 for strtok in tokens_by_type.get(PatternStr, []):
1301 if strtok.priority != retok.priority:
1302 continue
1303 s = strtok.pattern.value
1304 if s == _get_match(re_, retok.pattern.to_regexp(), s, g_regex_flags):
1305 unless.append(strtok)
1306 if strtok.pattern.flags <= retok.pattern.flags:
1307 embedded_strs.add(strtok)
1308 if unless:
1309 callback[retok.name] = UnlessCallback(Scanner(unless, g_regex_flags, re_, match_whole=True, use_bytes=use_bytes))
1311 new_terminals = [t for t in terminals if t not in embedded_strs]
1312 return new_terminals, callback
1315class Scanner:
1316 def __init__(self, terminals, g_regex_flags, re_, use_bytes, match_whole=False):
1317 self.terminals = terminals
1318 self.g_regex_flags = g_regex_flags
1319 self.re_ = re_
1320 self.use_bytes = use_bytes
1321 self.match_whole = match_whole
1323 self.allowed_types = {t.name for t in self.terminals}
1325 self._mres = self._build_mres(terminals, len(terminals))
1327 def _build_mres(self, terminals, max_size):
1328 ##
1330 ##
1332 ##
1334 postfix = '$' if self.match_whole else ''
1335 mres = []
1336 while terminals:
1337 pattern = u'|'.join(u'(?P<%s>%s)' % (t.name, t.pattern.to_regexp() + postfix) for t in terminals[:max_size])
1338 if self.use_bytes:
1339 pattern = pattern.encode('latin-1')
1340 try:
1341 mre = self.re_.compile(pattern, self.g_regex_flags)
1342 except AssertionError: ##
1344 return self._build_mres(terminals, max_size//2)
1346 mres.append((mre, {i: n for n, i in mre.groupindex.items()}))
1347 terminals = terminals[max_size:]
1348 return mres
1350 def match(self, text, pos):
1351 for mre, type_from_index in self._mres:
1352 m = mre.match(text, pos)
1353 if m:
1354 return m.group(0), type_from_index[m.lastindex]
1357def _regexp_has_newline(r: str):
1358 #--
1359 return '\n' in r or '\\n' in r or '\\s' in r or '[^' in r or ('(?s' in r and '.' in r)
1362class LexerState:
1363 #--
1365 __slots__ = 'text', 'line_ctr', 'last_token'
1367 def __init__(self, text, line_ctr=None, last_token=None):
1368 self.text = text
1369 self.line_ctr = line_ctr or LineCounter(b'\n' if isinstance(text, bytes) else '\n')
1370 self.last_token = last_token
1372 def __eq__(self, other):
1373 if not isinstance(other, LexerState):
1374 return NotImplemented
1376 return self.text is other.text and self.line_ctr == other.line_ctr and self.last_token == other.last_token
1378 def __copy__(self):
1379 return type(self)(self.text, copy(self.line_ctr), self.last_token)
1382class LexerThread:
1383 #--
1385 def __init__(self, lexer: 'Lexer', lexer_state: LexerState):
1386 self.lexer = lexer
1387 self.state = lexer_state
1389 @classmethod
1390 def from_text(cls, lexer: 'Lexer', text: str):
1391 return cls(lexer, LexerState(text))
1393 def lex(self, parser_state):
1394 return self.lexer.lex(self.state, parser_state)
1396 def __copy__(self):
1397 return type(self)(self.lexer, copy(self.state))
1399 _Token = Token
1402_Callback = Callable[[Token], Token]
1404class Lexer(ABC):
1405 #--
1406 @abstractmethod
1407 def lex(self, lexer_state: LexerState, parser_state: Any) -> Iterator[Token]:
1408 return NotImplemented
1410 def make_lexer_state(self, text):
1411 #--
1412 return LexerState(text)
1415class BasicLexer(Lexer):
1417 terminals: Collection[TerminalDef]
1418 ignore_types: FrozenSet[str]
1419 newline_types: FrozenSet[str]
1420 user_callbacks: Dict[str, _Callback]
1421 callback: Dict[str, _Callback]
1422 re: ModuleType
1424 def __init__(self, conf: 'LexerConf') -> None:
1425 terminals = list(conf.terminals)
1426 assert all(isinstance(t, TerminalDef) for t in terminals), terminals
1428 self.re = conf.re_module
1430 if not conf.skip_validation:
1431 ##
1433 for t in terminals:
1434 try:
1435 self.re.compile(t.pattern.to_regexp(), conf.g_regex_flags)
1436 except self.re.error:
1437 raise LexError("Cannot compile token %s: %s" % (t.name, t.pattern))
1439 if t.pattern.min_width == 0:
1440 raise LexError("Lexer does not allow zero-width terminals. (%s: %s)" % (t.name, t.pattern))
1442 if not (set(conf.ignore) <= {t.name for t in terminals}):
1443 raise LexError("Ignore terminals are not defined: %s" % (set(conf.ignore) - {t.name for t in terminals}))
1445 ##
1447 self.newline_types = frozenset(t.name for t in terminals if _regexp_has_newline(t.pattern.to_regexp()))
1448 self.ignore_types = frozenset(conf.ignore)
1450 terminals.sort(key=lambda x: (-x.priority, -x.pattern.max_width, -len(x.pattern.value), x.name))
1451 self.terminals = terminals
1452 self.user_callbacks = conf.callbacks
1453 self.g_regex_flags = conf.g_regex_flags
1454 self.use_bytes = conf.use_bytes
1455 self.terminals_by_name = conf.terminals_by_name
1457 self._scanner = None
1459 def _build_scanner(self):
1460 terminals, self.callback = _create_unless(self.terminals, self.g_regex_flags, self.re, self.use_bytes)
1461 assert all(self.callback.values())
1463 for type_, f in self.user_callbacks.items():
1464 if type_ in self.callback:
1465 ##
1467 self.callback[type_] = CallChain(self.callback[type_], f, lambda t: t.type == type_)
1468 else:
1469 self.callback[type_] = f
1471 self._scanner = Scanner(terminals, self.g_regex_flags, self.re, self.use_bytes)
1473 @property
1474 def scanner(self):
1475 if self._scanner is None:
1476 self._build_scanner()
1477 return self._scanner
1479 def match(self, text, pos):
1480 return self.scanner.match(text, pos)
1482 def lex(self, state: LexerState, parser_state: Any) -> Iterator[Token]:
1483 with suppress(EOFError):
1484 while True:
1485 yield self.next_token(state, parser_state)
1487 def next_token(self, lex_state: LexerState, parser_state: Any=None) -> Token:
1488 line_ctr = lex_state.line_ctr
1489 while line_ctr.char_pos < len(lex_state.text):
1490 res = self.match(lex_state.text, line_ctr.char_pos)
1491 if not res:
1492 allowed = self.scanner.allowed_types - self.ignore_types
1493 if not allowed:
1494 allowed = {"<END-OF-FILE>"}
1495 raise UnexpectedCharacters(lex_state.text, line_ctr.char_pos, line_ctr.line, line_ctr.column,
1496 allowed=allowed, token_history=lex_state.last_token and [lex_state.last_token],
1497 state=parser_state, terminals_by_name=self.terminals_by_name)
1499 value, type_ = res
1501 if type_ not in self.ignore_types:
1502 t = Token(type_, value, line_ctr.char_pos, line_ctr.line, line_ctr.column)
1503 line_ctr.feed(value, type_ in self.newline_types)
1504 t.end_line = line_ctr.line
1505 t.end_column = line_ctr.column
1506 t.end_pos = line_ctr.char_pos
1507 if t.type in self.callback:
1508 t = self.callback[t.type](t)
1509 if not isinstance(t, Token):
1510 raise LexError("Callbacks must return a token (returned %r)" % t)
1511 lex_state.last_token = t
1512 return t
1513 else:
1514 if type_ in self.callback:
1515 t2 = Token(type_, value, line_ctr.char_pos, line_ctr.line, line_ctr.column)
1516 self.callback[type_](t2)
1517 line_ctr.feed(value, type_ in self.newline_types)
1519 ##
1521 raise EOFError(self)
1524class ContextualLexer(Lexer):
1526 lexers: Dict[str, BasicLexer]
1527 root_lexer: BasicLexer
1529 def __init__(self, conf: 'LexerConf', states: Dict[str, Collection[str]], always_accept: Collection[str]=()) -> None:
1530 terminals = list(conf.terminals)
1531 terminals_by_name = conf.terminals_by_name
1533 trad_conf = copy(conf)
1534 trad_conf.terminals = terminals
1536 lexer_by_tokens: Dict[FrozenSet[str], BasicLexer] = {}
1537 self.lexers = {}
1538 for state, accepts in states.items():
1539 key = frozenset(accepts)
1540 try:
1541 lexer = lexer_by_tokens[key]
1542 except KeyError:
1543 accepts = set(accepts) | set(conf.ignore) | set(always_accept)
1544 lexer_conf = copy(trad_conf)
1545 lexer_conf.terminals = [terminals_by_name[n] for n in accepts if n in terminals_by_name]
1546 lexer = BasicLexer(lexer_conf)
1547 lexer_by_tokens[key] = lexer
1549 self.lexers[state] = lexer
1551 assert trad_conf.terminals is terminals
1552 self.root_lexer = BasicLexer(trad_conf)
1554 def lex(self, lexer_state: LexerState, parser_state: Any) -> Iterator[Token]:
1555 try:
1556 while True:
1557 lexer = self.lexers[parser_state.position]
1558 yield lexer.next_token(lexer_state, parser_state)
1559 except EOFError:
1560 pass
1561 except UnexpectedCharacters as e:
1562 ##
1564 ##
1566 try:
1567 last_token = lexer_state.last_token ##
1569 token = self.root_lexer.next_token(lexer_state, parser_state)
1570 raise UnexpectedToken(token, e.allowed, state=parser_state, token_history=[last_token], terminals_by_name=self.root_lexer.terminals_by_name)
1571 except UnexpectedCharacters:
1572 raise e ##
1577_ParserArgType: 'TypeAlias' = 'Literal["earley", "lalr", "cyk", "auto"]'
1578_LexerArgType: 'TypeAlias' = 'Union[Literal["auto", "basic", "contextual", "dynamic", "dynamic_complete"], Type[Lexer]]'
1579_Callback = Callable[[Token], Token]
1581class LexerConf(Serialize):
1582 __serialize_fields__ = 'terminals', 'ignore', 'g_regex_flags', 'use_bytes', 'lexer_type'
1583 __serialize_namespace__ = TerminalDef,
1585 terminals: Collection[TerminalDef]
1586 re_module: ModuleType
1587 ignore: Collection[str]
1588 postlex: 'Optional[PostLex]'
1589 callbacks: Dict[str, _Callback]
1590 g_regex_flags: int
1591 skip_validation: bool
1592 use_bytes: bool
1593 lexer_type: Optional[_LexerArgType]
1595 def __init__(self, terminals: Collection[TerminalDef], re_module: ModuleType, ignore: Collection[str]=(), postlex: 'Optional[PostLex]'=None, callbacks: Optional[Dict[str, _Callback]]=None, g_regex_flags: int=0, skip_validation: bool=False, use_bytes: bool=False):
1596 self.terminals = terminals
1597 self.terminals_by_name = {t.name: t for t in self.terminals}
1598 assert len(self.terminals) == len(self.terminals_by_name)
1599 self.ignore = ignore
1600 self.postlex = postlex
1601 self.callbacks = callbacks or {}
1602 self.g_regex_flags = g_regex_flags
1603 self.re_module = re_module
1604 self.skip_validation = skip_validation
1605 self.use_bytes = use_bytes
1606 self.lexer_type = None
1608 def _deserialize(self):
1609 self.terminals_by_name = {t.name: t for t in self.terminals}
1611 def __deepcopy__(self, memo=None):
1612 return type(self)(
1613 deepcopy(self.terminals, memo),
1614 self.re_module,
1615 deepcopy(self.ignore, memo),
1616 deepcopy(self.postlex, memo),
1617 deepcopy(self.callbacks, memo),
1618 deepcopy(self.g_regex_flags, memo),
1619 deepcopy(self.skip_validation, memo),
1620 deepcopy(self.use_bytes, memo),
1621 )
1624class ParserConf(Serialize):
1625 __serialize_fields__ = 'rules', 'start', 'parser_type'
1627 def __init__(self, rules, callbacks, start):
1628 assert isinstance(start, list)
1629 self.rules = rules
1630 self.callbacks = callbacks
1631 self.start = start
1633 self.parser_type = None
1636from functools import partial, wraps
1637from itertools import repeat, product
1640class ExpandSingleChild:
1641 def __init__(self, node_builder):
1642 self.node_builder = node_builder
1644 def __call__(self, children):
1645 if len(children) == 1:
1646 return children[0]
1647 else:
1648 return self.node_builder(children)
1652class PropagatePositions:
1653 def __init__(self, node_builder, node_filter=None):
1654 self.node_builder = node_builder
1655 self.node_filter = node_filter
1657 def __call__(self, children):
1658 res = self.node_builder(children)
1660 if isinstance(res, Tree):
1661 ##
1663 ##
1665 ##
1667 ##
1670 res_meta = res.meta
1672 first_meta = self._pp_get_meta(children)
1673 if first_meta is not None:
1674 if not hasattr(res_meta, 'line'):
1675 ##
1677 res_meta.line = getattr(first_meta, 'container_line', first_meta.line)
1678 res_meta.column = getattr(first_meta, 'container_column', first_meta.column)
1679 res_meta.start_pos = getattr(first_meta, 'container_start_pos', first_meta.start_pos)
1680 res_meta.empty = False
1682 res_meta.container_line = getattr(first_meta, 'container_line', first_meta.line)
1683 res_meta.container_column = getattr(first_meta, 'container_column', first_meta.column)
1685 last_meta = self._pp_get_meta(reversed(children))
1686 if last_meta is not None:
1687 if not hasattr(res_meta, 'end_line'):
1688 res_meta.end_line = getattr(last_meta, 'container_end_line', last_meta.end_line)
1689 res_meta.end_column = getattr(last_meta, 'container_end_column', last_meta.end_column)
1690 res_meta.end_pos = getattr(last_meta, 'container_end_pos', last_meta.end_pos)
1691 res_meta.empty = False
1693 res_meta.container_end_line = getattr(last_meta, 'container_end_line', last_meta.end_line)
1694 res_meta.container_end_column = getattr(last_meta, 'container_end_column', last_meta.end_column)
1696 return res
1698 def _pp_get_meta(self, children):
1699 for c in children:
1700 if self.node_filter is not None and not self.node_filter(c):
1701 continue
1702 if isinstance(c, Tree):
1703 if not c.meta.empty:
1704 return c.meta
1705 elif isinstance(c, Token):
1706 return c
1708def make_propagate_positions(option):
1709 if callable(option):
1710 return partial(PropagatePositions, node_filter=option)
1711 elif option is True:
1712 return PropagatePositions
1713 elif option is False:
1714 return None
1716 raise ConfigurationError('Invalid option for propagate_positions: %r' % option)
1719class ChildFilter:
1720 def __init__(self, to_include, append_none, node_builder):
1721 self.node_builder = node_builder
1722 self.to_include = to_include
1723 self.append_none = append_none
1725 def __call__(self, children):
1726 filtered = []
1728 for i, to_expand, add_none in self.to_include:
1729 if add_none:
1730 filtered += [None] * add_none
1731 if to_expand:
1732 filtered += children[i].children
1733 else:
1734 filtered.append(children[i])
1736 if self.append_none:
1737 filtered += [None] * self.append_none
1739 return self.node_builder(filtered)
1742class ChildFilterLALR(ChildFilter):
1743 #--
1745 def __call__(self, children):
1746 filtered = []
1747 for i, to_expand, add_none in self.to_include:
1748 if add_none:
1749 filtered += [None] * add_none
1750 if to_expand:
1751 if filtered:
1752 filtered += children[i].children
1753 else: ##
1755 filtered = children[i].children
1756 else:
1757 filtered.append(children[i])
1759 if self.append_none:
1760 filtered += [None] * self.append_none
1762 return self.node_builder(filtered)
1765class ChildFilterLALR_NoPlaceholders(ChildFilter):
1766 #--
1767 def __init__(self, to_include, node_builder):
1768 self.node_builder = node_builder
1769 self.to_include = to_include
1771 def __call__(self, children):
1772 filtered = []
1773 for i, to_expand in self.to_include:
1774 if to_expand:
1775 if filtered:
1776 filtered += children[i].children
1777 else: ##
1779 filtered = children[i].children
1780 else:
1781 filtered.append(children[i])
1782 return self.node_builder(filtered)
1785def _should_expand(sym):
1786 return not sym.is_term and sym.name.startswith('_')
1789def maybe_create_child_filter(expansion, keep_all_tokens, ambiguous, _empty_indices: List[bool]):
1790 ##
1792 if _empty_indices:
1793 assert _empty_indices.count(False) == len(expansion)
1794 s = ''.join(str(int(b)) for b in _empty_indices)
1795 empty_indices = [len(ones) for ones in s.split('0')]
1796 assert len(empty_indices) == len(expansion)+1, (empty_indices, len(expansion))
1797 else:
1798 empty_indices = [0] * (len(expansion)+1)
1800 to_include = []
1801 nones_to_add = 0
1802 for i, sym in enumerate(expansion):
1803 nones_to_add += empty_indices[i]
1804 if keep_all_tokens or not (sym.is_term and sym.filter_out):
1805 to_include.append((i, _should_expand(sym), nones_to_add))
1806 nones_to_add = 0
1808 nones_to_add += empty_indices[len(expansion)]
1810 if _empty_indices or len(to_include) < len(expansion) or any(to_expand for i, to_expand,_ in to_include):
1811 if _empty_indices or ambiguous:
1812 return partial(ChildFilter if ambiguous else ChildFilterLALR, to_include, nones_to_add)
1813 else:
1814 ##
1816 return partial(ChildFilterLALR_NoPlaceholders, [(i, x) for i,x,_ in to_include])
1819class AmbiguousExpander:
1820 #--
1821 def __init__(self, to_expand, tree_class, node_builder):
1822 self.node_builder = node_builder
1823 self.tree_class = tree_class
1824 self.to_expand = to_expand
1826 def __call__(self, children):
1827 def _is_ambig_tree(t):
1828 return hasattr(t, 'data') and t.data == '_ambig'
1830 ##
1832 ##
1834 ##
1836 ##
1838 ambiguous = []
1839 for i, child in enumerate(children):
1840 if _is_ambig_tree(child):
1841 if i in self.to_expand:
1842 ambiguous.append(i)
1844 child.expand_kids_by_data('_ambig')
1846 if not ambiguous:
1847 return self.node_builder(children)
1849 expand = [iter(child.children) if i in ambiguous else repeat(child) for i, child in enumerate(children)]
1850 return self.tree_class('_ambig', [self.node_builder(list(f[0])) for f in product(zip(*expand))])
1853def maybe_create_ambiguous_expander(tree_class, expansion, keep_all_tokens):
1854 to_expand = [i for i, sym in enumerate(expansion)
1855 if keep_all_tokens or ((not (sym.is_term and sym.filter_out)) and _should_expand(sym))]
1856 if to_expand:
1857 return partial(AmbiguousExpander, to_expand, tree_class)
1860class AmbiguousIntermediateExpander:
1861 #--
1863 def __init__(self, tree_class, node_builder):
1864 self.node_builder = node_builder
1865 self.tree_class = tree_class
1867 def __call__(self, children):
1868 def _is_iambig_tree(child):
1869 return hasattr(child, 'data') and child.data == '_iambig'
1871 def _collapse_iambig(children):
1872 #--
1874 ##
1876 ##
1878 if children and _is_iambig_tree(children[0]):
1879 iambig_node = children[0]
1880 result = []
1881 for grandchild in iambig_node.children:
1882 collapsed = _collapse_iambig(grandchild.children)
1883 if collapsed:
1884 for child in collapsed:
1885 child.children += children[1:]
1886 result += collapsed
1887 else:
1888 new_tree = self.tree_class('_inter', grandchild.children + children[1:])
1889 result.append(new_tree)
1890 return result
1892 collapsed = _collapse_iambig(children)
1893 if collapsed:
1894 processed_nodes = [self.node_builder(c.children) for c in collapsed]
1895 return self.tree_class('_ambig', processed_nodes)
1897 return self.node_builder(children)
1901def inplace_transformer(func):
1902 @wraps(func)
1903 def f(children):
1904 ##
1906 tree = Tree(func.__name__, children)
1907 return func(tree)
1908 return f
1911def apply_visit_wrapper(func, name, wrapper):
1912 if wrapper is _vargs_meta or wrapper is _vargs_meta_inline:
1913 raise NotImplementedError("Meta args not supported for internal transformer")
1915 @wraps(func)
1916 def f(children):
1917 return wrapper(func, name, children, None)
1918 return f
1921class ParseTreeBuilder:
1922 def __init__(self, rules, tree_class, propagate_positions=False, ambiguous=False, maybe_placeholders=False):
1923 self.tree_class = tree_class
1924 self.propagate_positions = propagate_positions
1925 self.ambiguous = ambiguous
1926 self.maybe_placeholders = maybe_placeholders
1928 self.rule_builders = list(self._init_builders(rules))
1930 def _init_builders(self, rules):
1931 propagate_positions = make_propagate_positions(self.propagate_positions)
1933 for rule in rules:
1934 options = rule.options
1935 keep_all_tokens = options.keep_all_tokens
1936 expand_single_child = options.expand1
1938 wrapper_chain = list(filter(None, [
1939 (expand_single_child and not rule.alias) and ExpandSingleChild,
1940 maybe_create_child_filter(rule.expansion, keep_all_tokens, self.ambiguous, options.empty_indices if self.maybe_placeholders else None),
1941 propagate_positions,
1942 self.ambiguous and maybe_create_ambiguous_expander(self.tree_class, rule.expansion, keep_all_tokens),
1943 self.ambiguous and partial(AmbiguousIntermediateExpander, self.tree_class)
1944 ]))
1946 yield rule, wrapper_chain
1948 def create_callback(self, transformer=None):
1949 callbacks = {}
1951 default_handler = getattr(transformer, '__default__', None)
1952 if default_handler:
1953 def default_callback(data, children):
1954 return default_handler(data, children, None)
1955 else:
1956 default_callback = self.tree_class
1958 for rule, wrapper_chain in self.rule_builders:
1960 user_callback_name = rule.alias or rule.options.template_source or rule.origin.name
1961 try:
1962 f = getattr(transformer, user_callback_name)
1963 wrapper = getattr(f, 'visit_wrapper', None)
1964 if wrapper is not None:
1965 f = apply_visit_wrapper(f, user_callback_name, wrapper)
1966 elif isinstance(transformer, Transformer_InPlace):
1967 f = inplace_transformer(f)
1968 except AttributeError:
1969 f = partial(default_callback, user_callback_name)
1971 for w in wrapper_chain:
1972 f = w(f)
1974 if rule in callbacks:
1975 raise GrammarError("Rule '%s' already exists" % (rule,))
1977 callbacks[rule] = f
1979 return callbacks
1983class LALR_Parser(Serialize):
1984 def __init__(self, parser_conf, debug=False):
1985 analysis = LALR_Analyzer(parser_conf, debug=debug)
1986 analysis.compute_lalr()
1987 callbacks = parser_conf.callbacks
1989 self._parse_table = analysis.parse_table
1990 self.parser_conf = parser_conf
1991 self.parser = _Parser(analysis.parse_table, callbacks, debug)
1993 @classmethod
1994 def deserialize(cls, data, memo, callbacks, debug=False):
1995 inst = cls.__new__(cls)
1996 inst._parse_table = IntParseTable.deserialize(data, memo)
1997 inst.parser = _Parser(inst._parse_table, callbacks, debug)
1998 return inst
2000 def serialize(self, memo):
2001 return self._parse_table.serialize(memo)
2003 def parse_interactive(self, lexer, start):
2004 return self.parser.parse(lexer, start, start_interactive=True)
2006 def parse(self, lexer, start, on_error=None):
2007 try:
2008 return self.parser.parse(lexer, start)
2009 except UnexpectedInput as e:
2010 if on_error is None:
2011 raise
2013 while True:
2014 if isinstance(e, UnexpectedCharacters):
2015 s = e.interactive_parser.lexer_thread.state
2016 p = s.line_ctr.char_pos
2018 if not on_error(e):
2019 raise e
2021 if isinstance(e, UnexpectedCharacters):
2022 ##
2024 if p == s.line_ctr.char_pos:
2025 s.line_ctr.feed(s.text[p:p+1])
2027 try:
2028 return e.interactive_parser.resume_parse()
2029 except UnexpectedToken as e2:
2030 if (isinstance(e, UnexpectedToken)
2031 and e.token.type == e2.token.type == '$END'
2032 and e.interactive_parser == e2.interactive_parser):
2033 ##
2035 raise e2
2036 e = e2
2037 except UnexpectedCharacters as e2:
2038 e = e2
2041class ParseConf:
2042 __slots__ = 'parse_table', 'callbacks', 'start', 'start_state', 'end_state', 'states'
2044 def __init__(self, parse_table, callbacks, start):
2045 self.parse_table = parse_table
2047 self.start_state = self.parse_table.start_states[start]
2048 self.end_state = self.parse_table.end_states[start]
2049 self.states = self.parse_table.states
2051 self.callbacks = callbacks
2052 self.start = start
2055class ParserState:
2056 __slots__ = 'parse_conf', 'lexer', 'state_stack', 'value_stack'
2058 def __init__(self, parse_conf, lexer, state_stack=None, value_stack=None):
2059 self.parse_conf = parse_conf
2060 self.lexer = lexer
2061 self.state_stack = state_stack or [self.parse_conf.start_state]
2062 self.value_stack = value_stack or []
2064 @property
2065 def position(self):
2066 return self.state_stack[-1]
2068 ##
2070 def __eq__(self, other):
2071 if not isinstance(other, ParserState):
2072 return NotImplemented
2073 return len(self.state_stack) == len(other.state_stack) and self.position == other.position
2075 def __copy__(self):
2076 return type(self)(
2077 self.parse_conf,
2078 self.lexer, ##
2080 copy(self.state_stack),
2081 deepcopy(self.value_stack),
2082 )
2084 def copy(self):
2085 return copy(self)
2087 def feed_token(self, token, is_end=False):
2088 state_stack = self.state_stack
2089 value_stack = self.value_stack
2090 states = self.parse_conf.states
2091 end_state = self.parse_conf.end_state
2092 callbacks = self.parse_conf.callbacks
2094 while True:
2095 state = state_stack[-1]
2096 try:
2097 action, arg = states[state][token.type]
2098 except KeyError:
2099 expected = {s for s in states[state].keys() if s.isupper()}
2100 raise UnexpectedToken(token, expected, state=self, interactive_parser=None)
2102 assert arg != end_state
2104 if action is Shift:
2105 ##
2107 assert not is_end
2108 state_stack.append(arg)
2109 value_stack.append(token if token.type not in callbacks else callbacks[token.type](token))
2110 return
2111 else:
2112 ##
2114 rule = arg
2115 size = len(rule.expansion)
2116 if size:
2117 s = value_stack[-size:]
2118 del state_stack[-size:]
2119 del value_stack[-size:]
2120 else:
2121 s = []
2123 value = callbacks[rule](s)
2125 _action, new_state = states[state_stack[-1]][rule.origin.name]
2126 assert _action is Shift
2127 state_stack.append(new_state)
2128 value_stack.append(value)
2130 if is_end and state_stack[-1] == end_state:
2131 return value_stack[-1]
2133class _Parser:
2134 def __init__(self, parse_table, callbacks, debug=False):
2135 self.parse_table = parse_table
2136 self.callbacks = callbacks
2137 self.debug = debug
2139 def parse(self, lexer, start, value_stack=None, state_stack=None, start_interactive=False):
2140 parse_conf = ParseConf(self.parse_table, self.callbacks, start)
2141 parser_state = ParserState(parse_conf, lexer, state_stack, value_stack)
2142 if start_interactive:
2143 return InteractiveParser(self, parser_state, parser_state.lexer)
2144 return self.parse_from_state(parser_state)
2147 def parse_from_state(self, state):
2148 ##
2150 try:
2151 token = None
2152 for token in state.lexer.lex(state):
2153 state.feed_token(token)
2155 end_token = Token.new_borrow_pos('$END', '', token) if token else Token('$END', '', 0, 1, 1)
2156 return state.feed_token(end_token, True)
2157 except UnexpectedInput as e:
2158 try:
2159 e.interactive_parser = InteractiveParser(self, state, state.lexer)
2160 except NameError:
2161 pass
2162 raise e
2163 except Exception as e:
2164 if self.debug:
2165 print("")
2166 print("STATE STACK DUMP")
2167 print("----------------")
2168 for i, s in enumerate(state.state_stack):
2169 print('%d)' % i , s)
2170 print("")
2172 raise
2175class Action:
2176 def __init__(self, name):
2177 self.name = name
2178 def __str__(self):
2179 return self.name
2180 def __repr__(self):
2181 return str(self)
2183Shift = Action('Shift')
2184Reduce = Action('Reduce')
2187class ParseTable:
2188 def __init__(self, states, start_states, end_states):
2189 self.states = states
2190 self.start_states = start_states
2191 self.end_states = end_states
2193 def serialize(self, memo):
2194 tokens = Enumerator()
2195 rules = Enumerator()
2197 states = {
2198 state: {tokens.get(token): ((1, arg.serialize(memo)) if action is Reduce else (0, arg))
2199 for token, (action, arg) in actions.items()}
2200 for state, actions in self.states.items()
2201 }
2203 return {
2204 'tokens': tokens.reversed(),
2205 'states': states,
2206 'start_states': self.start_states,
2207 'end_states': self.end_states,
2208 }
2210 @classmethod
2211 def deserialize(cls, data, memo):
2212 tokens = data['tokens']
2213 states = {
2214 state: {tokens[token]: ((Reduce, Rule.deserialize(arg, memo)) if action==1 else (Shift, arg))
2215 for token, (action, arg) in actions.items()}
2216 for state, actions in data['states'].items()
2217 }
2218 return cls(states, data['start_states'], data['end_states'])
2221class IntParseTable(ParseTable):
2223 @classmethod
2224 def from_ParseTable(cls, parse_table):
2225 enum = list(parse_table.states)
2226 state_to_idx = {s:i for i,s in enumerate(enum)}
2227 int_states = {}
2229 for s, la in parse_table.states.items():
2230 la = {k:(v[0], state_to_idx[v[1]]) if v[0] is Shift else v
2231 for k,v in la.items()}
2232 int_states[ state_to_idx[s] ] = la
2235 start_states = {start:state_to_idx[s] for start, s in parse_table.start_states.items()}
2236 end_states = {start:state_to_idx[s] for start, s in parse_table.end_states.items()}
2237 return cls(int_states, start_states, end_states)
2241def _wrap_lexer(lexer_class):
2242 future_interface = getattr(lexer_class, '__future_interface__', False)
2243 if future_interface:
2244 return lexer_class
2245 else:
2246 class CustomLexerWrapper(Lexer):
2247 def __init__(self, lexer_conf):
2248 self.lexer = lexer_class(lexer_conf)
2249 def lex(self, lexer_state, parser_state):
2250 return self.lexer.lex(lexer_state.text)
2251 return CustomLexerWrapper
2254def _deserialize_parsing_frontend(data, memo, lexer_conf, callbacks, options):
2255 parser_conf = ParserConf.deserialize(data['parser_conf'], memo)
2256 cls = (options and options._plugins.get('LALR_Parser')) or LALR_Parser
2257 parser = cls.deserialize(data['parser'], memo, callbacks, options.debug)
2258 parser_conf.callbacks = callbacks
2259 return ParsingFrontend(lexer_conf, parser_conf, options, parser=parser)
2262_parser_creators: 'Dict[str, Callable[[LexerConf, Any, Any], Any]]' = {}
2265class ParsingFrontend(Serialize):
2266 __serialize_fields__ = 'lexer_conf', 'parser_conf', 'parser'
2268 def __init__(self, lexer_conf, parser_conf, options, parser=None):
2269 self.parser_conf = parser_conf
2270 self.lexer_conf = lexer_conf
2271 self.options = options
2273 ##
2275 if parser: ##
2277 self.parser = parser
2278 else:
2279 create_parser = _parser_creators.get(parser_conf.parser_type)
2280 assert create_parser is not None, "{} is not supported in standalone mode".format(
2281 parser_conf.parser_type
2282 )
2283 self.parser = create_parser(lexer_conf, parser_conf, options)
2285 ##
2287 lexer_type = lexer_conf.lexer_type
2288 self.skip_lexer = False
2289 if lexer_type in ('dynamic', 'dynamic_complete'):
2290 assert lexer_conf.postlex is None
2291 self.skip_lexer = True
2292 return
2294 try:
2295 create_lexer = {
2296 'basic': create_basic_lexer,
2297 'contextual': create_contextual_lexer,
2298 }[lexer_type]
2299 except KeyError:
2300 assert issubclass(lexer_type, Lexer), lexer_type
2301 self.lexer = _wrap_lexer(lexer_type)(lexer_conf)
2302 else:
2303 self.lexer = create_lexer(lexer_conf, self.parser, lexer_conf.postlex, options)
2305 if lexer_conf.postlex:
2306 self.lexer = PostLexConnector(self.lexer, lexer_conf.postlex)
2308 def _verify_start(self, start=None):
2309 if start is None:
2310 start_decls = self.parser_conf.start
2311 if len(start_decls) > 1:
2312 raise ConfigurationError("Lark initialized with more than 1 possible start rule. Must specify which start rule to parse", start_decls)
2313 start ,= start_decls
2314 elif start not in self.parser_conf.start:
2315 raise ConfigurationError("Unknown start rule %s. Must be one of %r" % (start, self.parser_conf.start))
2316 return start
2318 def _make_lexer_thread(self, text):
2319 cls = (self.options and self.options._plugins.get('LexerThread')) or LexerThread
2320 return text if self.skip_lexer else cls.from_text(self.lexer, text)
2322 def parse(self, text, start=None, on_error=None):
2323 chosen_start = self._verify_start(start)
2324 kw = {} if on_error is None else {'on_error': on_error}
2325 stream = self._make_lexer_thread(text)
2326 return self.parser.parse(stream, chosen_start, **kw)
2328 def parse_interactive(self, text=None, start=None):
2329 chosen_start = self._verify_start(start)
2330 if self.parser_conf.parser_type != 'lalr':
2331 raise ConfigurationError("parse_interactive() currently only works with parser='lalr' ")
2332 stream = self._make_lexer_thread(text)
2333 return self.parser.parse_interactive(stream, chosen_start)
2336def _validate_frontend_args(parser, lexer) -> None:
2337 assert_config(parser, ('lalr', 'earley', 'cyk'))
2338 if not isinstance(lexer, type): ##
2340 expected = {
2341 'lalr': ('basic', 'contextual'),
2342 'earley': ('basic', 'dynamic', 'dynamic_complete'),
2343 'cyk': ('basic', ),
2344 }[parser]
2345 assert_config(lexer, expected, 'Parser %r does not support lexer %%r, expected one of %%s' % parser)
2348def _get_lexer_callbacks(transformer, terminals):
2349 result = {}
2350 for terminal in terminals:
2351 callback = getattr(transformer, terminal.name, None)
2352 if callback is not None:
2353 result[terminal.name] = callback
2354 return result
2356class PostLexConnector:
2357 def __init__(self, lexer, postlexer):
2358 self.lexer = lexer
2359 self.postlexer = postlexer
2361 def lex(self, lexer_state, parser_state):
2362 i = self.lexer.lex(lexer_state, parser_state)
2363 return self.postlexer.process(i)
2367def create_basic_lexer(lexer_conf, parser, postlex, options):
2368 cls = (options and options._plugins.get('BasicLexer')) or BasicLexer
2369 return cls(lexer_conf)
2371def create_contextual_lexer(lexer_conf, parser, postlex, options):
2372 cls = (options and options._plugins.get('ContextualLexer')) or ContextualLexer
2373 states = {idx:list(t.keys()) for idx, t in parser._parse_table.states.items()}
2374 always_accept = postlex.always_accept if postlex else ()
2375 return cls(lexer_conf, states, always_accept=always_accept)
2377def create_lalr_parser(lexer_conf, parser_conf, options=None):
2378 debug = options.debug if options else False
2379 cls = (options and options._plugins.get('LALR_Parser')) or LALR_Parser
2380 return cls(parser_conf, debug=debug)
2382_parser_creators['lalr'] = create_lalr_parser
2387class PostLex(ABC):
2388 @abstractmethod
2389 def process(self, stream: Iterator[Token]) -> Iterator[Token]:
2390 return stream
2392 always_accept: Iterable[str] = ()
2394class LarkOptions(Serialize):
2395 #--
2397 start: List[str]
2398 debug: bool
2399 transformer: 'Optional[Transformer]'
2400 propagate_positions: Union[bool, str]
2401 maybe_placeholders: bool
2402 cache: Union[bool, str]
2403 regex: bool
2404 g_regex_flags: int
2405 keep_all_tokens: bool
2406 tree_class: Any
2407 parser: _ParserArgType
2408 lexer: _LexerArgType
2409 ambiguity: 'Literal["auto", "resolve", "explicit", "forest"]'
2410 postlex: Optional[PostLex]
2411 priority: 'Optional[Literal["auto", "normal", "invert"]]'
2412 lexer_callbacks: Dict[str, Callable[[Token], Token]]
2413 use_bytes: bool
2414 edit_terminals: Optional[Callable[[TerminalDef], TerminalDef]]
2415 import_paths: 'List[Union[str, Callable[[Union[None, str, PackageResource], str], Tuple[str, str]]]]'
2416 source_path: Optional[str]
2418 OPTIONS_DOC = """
2419 **=== General Options ===**
2421 start
2422 The start symbol. Either a string, or a list of strings for multiple possible starts (Default: "start")
2423 debug
2424 Display debug information and extra warnings. Use only when debugging (Default: ``False``)
2425 When used with Earley, it generates a forest graph as "sppf.png", if 'dot' is installed.
2426 transformer
2427 Applies the transformer to every parse tree (equivalent to applying it after the parse, but faster)
2428 propagate_positions
2429 Propagates (line, column, end_line, end_column) attributes into all tree branches.
2430 Accepts ``False``, ``True``, or a callable, which will filter which nodes to ignore when propagating.
2431 maybe_placeholders
2432 When ``True``, the ``[]`` operator returns ``None`` when not matched.
2433 When ``False``, ``[]`` behaves like the ``?`` operator, and returns no value at all.
2434 (default= ``True``)
2435 cache
2436 Cache the results of the Lark grammar analysis, for x2 to x3 faster loading. LALR only for now.
2438 - When ``False``, does nothing (default)
2439 - When ``True``, caches to a temporary file in the local directory
2440 - When given a string, caches to the path pointed by the string
2441 regex
2442 When True, uses the ``regex`` module instead of the stdlib ``re``.
2443 g_regex_flags
2444 Flags that are applied to all terminals (both regex and strings)
2445 keep_all_tokens
2446 Prevent the tree builder from automagically removing "punctuation" tokens (Default: ``False``)
2447 tree_class
2448 Lark will produce trees comprised of instances of this class instead of the default ``lark.Tree``.
2450 **=== Algorithm Options ===**
2452 parser
2453 Decides which parser engine to use. Accepts "earley" or "lalr". (Default: "earley").
2454 (there is also a "cyk" option for legacy)
2455 lexer
2456 Decides whether or not to use a lexer stage
2458 - "auto" (default): Choose for me based on the parser
2459 - "basic": Use a basic lexer
2460 - "contextual": Stronger lexer (only works with parser="lalr")
2461 - "dynamic": Flexible and powerful (only with parser="earley")
2462 - "dynamic_complete": Same as dynamic, but tries *every* variation of tokenizing possible.
2463 ambiguity
2464 Decides how to handle ambiguity in the parse. Only relevant if parser="earley"
2466 - "resolve": The parser will automatically choose the simplest derivation
2467 (it chooses consistently: greedy for tokens, non-greedy for rules)
2468 - "explicit": The parser will return all derivations wrapped in "_ambig" tree nodes (i.e. a forest).
2469 - "forest": The parser will return the root of the shared packed parse forest.
2471 **=== Misc. / Domain Specific Options ===**
2473 postlex
2474 Lexer post-processing (Default: ``None``) Only works with the basic and contextual lexers.
2475 priority
2476 How priorities should be evaluated - "auto", ``None``, "normal", "invert" (Default: "auto")
2477 lexer_callbacks
2478 Dictionary of callbacks for the lexer. May alter tokens during lexing. Use with caution.
2479 use_bytes
2480 Accept an input of type ``bytes`` instead of ``str``.
2481 edit_terminals
2482 A callback for editing the terminals before parse.
2483 import_paths
2484 A List of either paths or loader functions to specify from where grammars are imported
2485 source_path
2486 Override the source of from where the grammar was loaded. Useful for relative imports and unconventional grammar loading
2487 **=== End of Options ===**
2488 """
2489 if __doc__:
2490 __doc__ += OPTIONS_DOC
2493 ##
2495 ##
2497 ##
2499 ##
2501 ##
2503 ##
2505 _defaults: Dict[str, Any] = {
2506 'debug': False,
2507 'keep_all_tokens': False,
2508 'tree_class': None,
2509 'cache': False,
2510 'postlex': None,
2511 'parser': 'earley',
2512 'lexer': 'auto',
2513 'transformer': None,
2514 'start': 'start',
2515 'priority': 'auto',
2516 'ambiguity': 'auto',
2517 'regex': False,
2518 'propagate_positions': False,
2519 'lexer_callbacks': {},
2520 'maybe_placeholders': True,
2521 'edit_terminals': None,
2522 'g_regex_flags': 0,
2523 'use_bytes': False,
2524 'import_paths': [],
2525 'source_path': None,
2526 '_plugins': {},
2527 }
2529 def __init__(self, options_dict):
2530 o = dict(options_dict)
2532 options = {}
2533 for name, default in self._defaults.items():
2534 if name in o:
2535 value = o.pop(name)
2536 if isinstance(default, bool) and name not in ('cache', 'use_bytes', 'propagate_positions'):
2537 value = bool(value)
2538 else:
2539 value = default
2541 options[name] = value
2543 if isinstance(options['start'], str):
2544 options['start'] = [options['start']]
2546 self.__dict__['options'] = options
2549 assert_config(self.parser, ('earley', 'lalr', 'cyk', None))
2551 if self.parser == 'earley' and self.transformer:
2552 raise ConfigurationError('Cannot specify an embedded transformer when using the Earley algorithm. '
2553 'Please use your transformer on the resulting parse tree, or use a different algorithm (i.e. LALR)')
2555 if o:
2556 raise ConfigurationError("Unknown options: %s" % o.keys())
2558 def __getattr__(self, name):
2559 try:
2560 return self.__dict__['options'][name]
2561 except KeyError as e:
2562 raise AttributeError(e)
2564 def __setattr__(self, name, value):
2565 assert_config(name, self.options.keys(), "%r isn't a valid option. Expected one of: %s")
2566 self.options[name] = value
2568 def serialize(self, memo):
2569 return self.options
2571 @classmethod
2572 def deserialize(cls, data, memo):
2573 return cls(data)
2576##
2578##
2580_LOAD_ALLOWED_OPTIONS = {'postlex', 'transformer', 'lexer_callbacks', 'use_bytes', 'debug', 'g_regex_flags', 'regex', 'propagate_positions', 'tree_class', '_plugins'}
2582_VALID_PRIORITY_OPTIONS = ('auto', 'normal', 'invert', None)
2583_VALID_AMBIGUITY_OPTIONS = ('auto', 'resolve', 'explicit', 'forest')
2586_T = TypeVar('_T', bound="Lark")
2588class Lark(Serialize):
2589 #--
2591 source_path: str
2592 source_grammar: str
2593 grammar: 'Grammar'
2594 options: LarkOptions
2595 lexer: Lexer
2596 terminals: List[TerminalDef]
2598 def __init__(self, grammar: 'Union[Grammar, str, IO[str]]', **options) -> None:
2599 self.options = LarkOptions(options)
2601 ##
2603 use_regex = self.options.regex
2604 if use_regex:
2605 if regex:
2606 re_module = regex
2607 else:
2608 raise ImportError('`regex` module must be installed if calling `Lark(regex=True)`.')
2609 else:
2610 re_module = re
2612 ##
2614 if self.options.source_path is None:
2615 try:
2616 self.source_path = grammar.name
2617 except AttributeError:
2618 self.source_path = '<string>'
2619 else:
2620 self.source_path = self.options.source_path
2622 ##
2624 try:
2625 read = grammar.read
2626 except AttributeError:
2627 pass
2628 else:
2629 grammar = read()
2631 cache_fn = None
2632 cache_md5 = None
2633 if isinstance(grammar, str):
2634 self.source_grammar = grammar
2635 if self.options.use_bytes:
2636 if not isascii(grammar):
2637 raise ConfigurationError("Grammar must be ascii only, when use_bytes=True")
2639 if self.options.cache:
2640 if self.options.parser != 'lalr':
2641 raise ConfigurationError("cache only works with parser='lalr' for now")
2643 unhashable = ('transformer', 'postlex', 'lexer_callbacks', 'edit_terminals', '_plugins')
2644 options_str = ''.join(k+str(v) for k, v in options.items() if k not in unhashable)
2645 from . import __version__
2646 s = grammar + options_str + __version__ + str(sys.version_info[:2])
2647 cache_md5 = hashlib.md5(s.encode('utf8')).hexdigest()
2649 if isinstance(self.options.cache, str):
2650 cache_fn = self.options.cache
2651 else:
2652 if self.options.cache is not True:
2653 raise ConfigurationError("cache argument must be bool or str")
2655 cache_fn = tempfile.gettempdir() + '/.lark_cache_%s_%s_%s.tmp' % (cache_md5, *sys.version_info[:2])
2657 if FS.exists(cache_fn):
2658 logger.debug('Loading grammar from cache: %s', cache_fn)
2659 ##
2661 for name in (set(options) - _LOAD_ALLOWED_OPTIONS):
2662 del options[name]
2663 with FS.open(cache_fn, 'rb') as f:
2664 old_options = self.options
2665 try:
2666 file_md5 = f.readline().rstrip(b'\n')
2667 cached_used_files = pickle.load(f)
2668 if file_md5 == cache_md5.encode('utf8') and verify_used_files(cached_used_files):
2669 cached_parser_data = pickle.load(f)
2670 self._load(cached_parser_data, **options)
2671 return
2672 except Exception: ##
2674 logger.exception("Failed to load Lark from cache: %r. We will try to carry on." % cache_fn)
2676 ##
2678 ##
2680 self.options = old_options
2683 ##
2685 self.grammar, used_files = load_grammar(grammar, self.source_path, self.options.import_paths, self.options.keep_all_tokens)
2686 else:
2687 assert isinstance(grammar, Grammar)
2688 self.grammar = grammar
2691 if self.options.lexer == 'auto':
2692 if self.options.parser == 'lalr':
2693 self.options.lexer = 'contextual'
2694 elif self.options.parser == 'earley':
2695 if self.options.postlex is not None:
2696 logger.info("postlex can't be used with the dynamic lexer, so we use 'basic' instead. "
2697 "Consider using lalr with contextual instead of earley")
2698 self.options.lexer = 'basic'
2699 else:
2700 self.options.lexer = 'dynamic'
2701 elif self.options.parser == 'cyk':
2702 self.options.lexer = 'basic'
2703 else:
2704 assert False, self.options.parser
2705 lexer = self.options.lexer
2706 if isinstance(lexer, type):
2707 assert issubclass(lexer, Lexer) ##
2709 else:
2710 assert_config(lexer, ('basic', 'contextual', 'dynamic', 'dynamic_complete'))
2711 if self.options.postlex is not None and 'dynamic' in lexer:
2712 raise ConfigurationError("Can't use postlex with a dynamic lexer. Use basic or contextual instead")
2714 if self.options.ambiguity == 'auto':
2715 if self.options.parser == 'earley':
2716 self.options.ambiguity = 'resolve'
2717 else:
2718 assert_config(self.options.parser, ('earley', 'cyk'), "%r doesn't support disambiguation. Use one of these parsers instead: %s")
2720 if self.options.priority == 'auto':
2721 self.options.priority = 'normal'
2723 if self.options.priority not in _VALID_PRIORITY_OPTIONS:
2724 raise ConfigurationError("invalid priority option: %r. Must be one of %r" % (self.options.priority, _VALID_PRIORITY_OPTIONS))
2725 if self.options.ambiguity not in _VALID_AMBIGUITY_OPTIONS:
2726 raise ConfigurationError("invalid ambiguity option: %r. Must be one of %r" % (self.options.ambiguity, _VALID_AMBIGUITY_OPTIONS))
2728 if self.options.parser is None:
2729 terminals_to_keep = '*'
2730 elif self.options.postlex is not None:
2731 terminals_to_keep = set(self.options.postlex.always_accept)
2732 else:
2733 terminals_to_keep = set()
2735 ##
2737 self.terminals, self.rules, self.ignore_tokens = self.grammar.compile(self.options.start, terminals_to_keep)
2739 if self.options.edit_terminals:
2740 for t in self.terminals:
2741 self.options.edit_terminals(t)
2743 self._terminals_dict = {t.name: t for t in self.terminals}
2745 ##
2747 if self.options.priority == 'invert':
2748 for rule in self.rules:
2749 if rule.options.priority is not None:
2750 rule.options.priority = -rule.options.priority
2751 for term in self.terminals:
2752 term.priority = -term.priority
2753 ##
2755 ##
2757 ##
2759 elif self.options.priority is None:
2760 for rule in self.rules:
2761 if rule.options.priority is not None:
2762 rule.options.priority = None
2763 for term in self.terminals:
2764 term.priority = 0
2766 ##
2768 self.lexer_conf = LexerConf(
2769 self.terminals, re_module, self.ignore_tokens, self.options.postlex,
2770 self.options.lexer_callbacks, self.options.g_regex_flags, use_bytes=self.options.use_bytes
2771 )
2773 if self.options.parser:
2774 self.parser = self._build_parser()
2775 elif lexer:
2776 self.lexer = self._build_lexer()
2778 if cache_fn:
2779 logger.debug('Saving grammar to cache: %s', cache_fn)
2780 with FS.open(cache_fn, 'wb') as f:
2781 assert cache_md5 is not None
2782 f.write(cache_md5.encode('utf8') + b'\n')
2783 pickle.dump(used_files, f)
2784 self.save(f, _LOAD_ALLOWED_OPTIONS)
2786 if __doc__:
2787 __doc__ += "\n\n" + LarkOptions.OPTIONS_DOC
2789 __serialize_fields__ = 'parser', 'rules', 'options'
2791 def _build_lexer(self, dont_ignore=False):
2792 lexer_conf = self.lexer_conf
2793 if dont_ignore:
2794 from copy import copy
2795 lexer_conf = copy(lexer_conf)
2796 lexer_conf.ignore = ()
2797 return BasicLexer(lexer_conf)
2799 def _prepare_callbacks(self):
2800 self._callbacks = {}
2801 ##
2803 if self.options.ambiguity != 'forest':
2804 self._parse_tree_builder = ParseTreeBuilder(
2805 self.rules,
2806 self.options.tree_class or Tree,
2807 self.options.propagate_positions,
2808 self.options.parser != 'lalr' and self.options.ambiguity == 'explicit',
2809 self.options.maybe_placeholders
2810 )
2811 self._callbacks = self._parse_tree_builder.create_callback(self.options.transformer)
2812 self._callbacks.update(_get_lexer_callbacks(self.options.transformer, self.terminals))
2814 def _build_parser(self):
2815 self._prepare_callbacks()
2816 _validate_frontend_args(self.options.parser, self.options.lexer)
2817 parser_conf = ParserConf(self.rules, self._callbacks, self.options.start)
2818 return _construct_parsing_frontend(
2819 self.options.parser,
2820 self.options.lexer,
2821 self.lexer_conf,
2822 parser_conf,
2823 options=self.options
2824 )
2826 def save(self, f, exclude_options: Collection[str] = ()):
2827 #--
2828 data, m = self.memo_serialize([TerminalDef, Rule])
2829 if exclude_options:
2830 data["options"] = {n: v for n, v in data["options"].items() if n not in exclude_options}
2831 pickle.dump({'data': data, 'memo': m}, f, protocol=pickle.HIGHEST_PROTOCOL)
2833 @classmethod
2834 def load(cls, f):
2835 #--
2836 inst = cls.__new__(cls)
2837 return inst._load(f)
2839 def _deserialize_lexer_conf(self, data, memo, options):
2840 lexer_conf = LexerConf.deserialize(data['lexer_conf'], memo)
2841 lexer_conf.callbacks = options.lexer_callbacks or {}
2842 lexer_conf.re_module = regex if options.regex else re
2843 lexer_conf.use_bytes = options.use_bytes
2844 lexer_conf.g_regex_flags = options.g_regex_flags
2845 lexer_conf.skip_validation = True
2846 lexer_conf.postlex = options.postlex
2847 return lexer_conf
2849 def _load(self, f, **kwargs):
2850 if isinstance(f, dict):
2851 d = f
2852 else:
2853 d = pickle.load(f)
2854 memo_json = d['memo']
2855 data = d['data']
2857 assert memo_json
2858 memo = SerializeMemoizer.deserialize(memo_json, {'Rule': Rule, 'TerminalDef': TerminalDef}, {})
2859 options = dict(data['options'])
2860 if (set(kwargs) - _LOAD_ALLOWED_OPTIONS) & set(LarkOptions._defaults):
2861 raise ConfigurationError("Some options are not allowed when loading a Parser: {}"
2862 .format(set(kwargs) - _LOAD_ALLOWED_OPTIONS))
2863 options.update(kwargs)
2864 self.options = LarkOptions.deserialize(options, memo)
2865 self.rules = [Rule.deserialize(r, memo) for r in data['rules']]
2866 self.source_path = '<deserialized>'
2867 _validate_frontend_args(self.options.parser, self.options.lexer)
2868 self.lexer_conf = self._deserialize_lexer_conf(data['parser'], memo, self.options)
2869 self.terminals = self.lexer_conf.terminals
2870 self._prepare_callbacks()
2871 self._terminals_dict = {t.name: t for t in self.terminals}
2872 self.parser = _deserialize_parsing_frontend(
2873 data['parser'],
2874 memo,
2875 self.lexer_conf,
2876 self._callbacks,
2877 self.options, ##
2879 )
2880 return self
2882 @classmethod
2883 def _load_from_dict(cls, data, memo, **kwargs):
2884 inst = cls.__new__(cls)
2885 return inst._load({'data': data, 'memo': memo}, **kwargs)
2887 @classmethod
2888 def open(cls: Type[_T], grammar_filename: str, rel_to: Optional[str]=None, **options) -> _T:
2889 #--
2890 if rel_to:
2891 basepath = os.path.dirname(rel_to)
2892 grammar_filename = os.path.join(basepath, grammar_filename)
2893 with open(grammar_filename, encoding='utf8') as f:
2894 return cls(f, **options)
2896 @classmethod
2897 def open_from_package(cls: Type[_T], package: str, grammar_path: str, search_paths: 'Sequence[str]'=[""], **options) -> _T:
2898 #--
2899 package_loader = FromPackageLoader(package, search_paths)
2900 full_path, text = package_loader(None, grammar_path)
2901 options.setdefault('source_path', full_path)
2902 options.setdefault('import_paths', [])
2903 options['import_paths'].append(package_loader)
2904 return cls(text, **options)
2906 def __repr__(self):
2907 return 'Lark(open(%r), parser=%r, lexer=%r, ...)' % (self.source_path, self.options.parser, self.options.lexer)
2910 def lex(self, text: str, dont_ignore: bool=False) -> Iterator[Token]:
2911 #--
2912 if not hasattr(self, 'lexer') or dont_ignore:
2913 lexer = self._build_lexer(dont_ignore)
2914 else:
2915 lexer = self.lexer
2916 lexer_thread = LexerThread.from_text(lexer, text)
2917 stream = lexer_thread.lex(None)
2918 if self.options.postlex:
2919 return self.options.postlex.process(stream)
2920 return stream
2922 def get_terminal(self, name: str) -> TerminalDef:
2923 #--
2924 return self._terminals_dict[name]
2926 def parse_interactive(self, text: Optional[str]=None, start: Optional[str]=None) -> 'InteractiveParser':
2927 #--
2928 return self.parser.parse_interactive(text, start=start)
2930 def parse(self, text: str, start: Optional[str]=None, on_error: 'Optional[Callable[[UnexpectedInput], bool]]'=None) -> 'ParseTree':
2931 #--
2932 return self.parser.parse(text, start=start, on_error=on_error)
2937class DedentError(LarkError):
2938 pass
2940class Indenter(PostLex, ABC):
2941 paren_level: int
2942 indent_level: List[int]
2944 def __init__(self) -> None:
2945 self.paren_level = 0
2946 self.indent_level = [0]
2947 assert self.tab_len > 0
2949 def handle_NL(self, token: Token) -> Iterator[Token]:
2950 if self.paren_level > 0:
2951 return
2953 yield token
2955 indent_str = token.rsplit('\n', 1)[1] ##
2957 indent = indent_str.count(' ') + indent_str.count('\t') * self.tab_len
2959 if indent > self.indent_level[-1]:
2960 self.indent_level.append(indent)
2961 yield Token.new_borrow_pos(self.INDENT_type, indent_str, token)
2962 else:
2963 while indent < self.indent_level[-1]:
2964 self.indent_level.pop()
2965 yield Token.new_borrow_pos(self.DEDENT_type, indent_str, token)
2967 if indent != self.indent_level[-1]:
2968 raise DedentError('Unexpected dedent to column %s. Expected dedent to %s' % (indent, self.indent_level[-1]))
2970 def _process(self, stream):
2971 for token in stream:
2972 if token.type == self.NL_type:
2973 yield from self.handle_NL(token)
2974 else:
2975 yield token
2977 if token.type in self.OPEN_PAREN_types:
2978 self.paren_level += 1
2979 elif token.type in self.CLOSE_PAREN_types:
2980 self.paren_level -= 1
2981 assert self.paren_level >= 0
2983 while len(self.indent_level) > 1:
2984 self.indent_level.pop()
2985 yield Token(self.DEDENT_type, '')
2987 assert self.indent_level == [0], self.indent_level
2989 def process(self, stream):
2990 self.paren_level = 0
2991 self.indent_level = [0]
2992 return self._process(stream)
2994 ##
2996 @property
2997 def always_accept(self):
2998 return (self.NL_type,)
3000 @property
3001 @abstractmethod
3002 def NL_type(self) -> str:
3003 raise NotImplementedError()
3005 @property
3006 @abstractmethod
3007 def OPEN_PAREN_types(self) -> List[str]:
3008 raise NotImplementedError()
3010 @property
3011 @abstractmethod
3012 def CLOSE_PAREN_types(self) -> List[str]:
3013 raise NotImplementedError()
3015 @property
3016 @abstractmethod
3017 def INDENT_type(self) -> str:
3018 raise NotImplementedError()
3020 @property
3021 @abstractmethod
3022 def DEDENT_type(self) -> str:
3023 raise NotImplementedError()
3025 @property
3026 @abstractmethod
3027 def tab_len(self) -> int:
3028 raise NotImplementedError()
3031class PythonIndenter(Indenter):
3032 NL_type = '_NEWLINE'
3033 OPEN_PAREN_types = ['LPAR', 'LSQB', 'LBRACE']
3034 CLOSE_PAREN_types = ['RPAR', 'RSQB', 'RBRACE']
3035 INDENT_type = '_INDENT'
3036 DEDENT_type = '_DEDENT'
3037 tab_len = 8
3040import pickle, zlib, base64
3041DATA = (
3042{'parser': {'lexer_conf': {'terminals': [{'@': 0}, {'@': 1}, {'@': 2}, {'@': 3}, {'@': 4}, {'@': 5}, {'@': 6}, {'@': 7}, {'@': 8}, {'@': 9}, {'@': 10}, {'@': 11}], 'ignore': ['WS'], 'g_regex_flags': 0, 'use_bytes': False, 'lexer_type': 'contextual', '__type__': 'LexerConf'}, 'parser_conf': {'rules': [{'@': 12}, {'@': 13}, {'@': 14}, {'@': 15}, {'@': 16}, {'@': 17}, {'@': 18}, {'@': 19}, {'@': 20}, {'@': 21}, {'@': 22}, {'@': 23}, {'@': 24}, {'@': 25}, {'@': 26}, {'@': 27}, {'@': 28}, {'@': 29}, {'@': 30}, {'@': 31}, {'@': 32}], 'start': ['start'], 'parser_type': 'lalr', '__type__': 'ParserConf'}, 'parser': {'tokens': {0: '$END', 1: 'RSQB', 2: 'COMMA', 3: 'RBRACE', 4: 'LSQB', 5: 'array', 6: 'FALSE', 7: 'value', 8: 'object', 9: 'start', 10: 'TRUE', 11: 'LBRACE', 12: 'NULL', 13: 'ESCAPED_STRING', 14: 'string', 15: 'SIGNED_NUMBER', 16: 'item', 17: '___items_star_1', 18: '_items', 19: '__array_star_0', 20: 'COLON'}, 'states': {0: {0: (1, {'@': 24}), 1: (1, {'@': 24}), 2: (1, {'@': 24}), 3: (1, {'@': 24})}, 1: {1: (1, {'@': 30}), 2: (1, {'@': 30})}, 2: {4: (0, 20), 5: (0, 5), 6: (0, 17), 7: (0, 7), 8: (0, 4), 9: (0, 19), 10: (0, 8), 11: (0, 16), 12: (0, 33), 13: (0, 31), 14: (0, 9), 15: (0, 26)}, 3: {16: (0, 25), 14: (0, 32), 13: (0, 31)}, 4: {0: (1, {'@': 13}), 1: (1, {'@': 13}), 2: (1, {'@': 13}), 3: (1, {'@': 13})}, 5: {0: (1, {'@': 14}), 1: (1, {'@': 14}), 2: (1, {'@': 14}), 3: (1, {'@': 14})}, 6: {0: (1, {'@': 20}), 1: (1, {'@': 20}), 2: (1, {'@': 20}), 3: (1, {'@': 20})}, 7: {0: (1, {'@': 12})}, 8: {0: (1, {'@': 17}), 1: (1, {'@': 17}), 2: (1, {'@': 17}), 3: (1, {'@': 17})}, 9: {0: (1, {'@': 15}), 1: (1, {'@': 15}), 2: (1, {'@': 15}), 3: (1, {'@': 15})}, 10: {1: (0, 6), 2: (0, 24)}, 11: {3: (1, {'@': 32}), 2: (1, {'@': 32})}, 12: {0: (1, {'@': 22}), 1: (1, {'@': 22}), 2: (1, {'@': 22}), 3: (1, {'@': 22})}, 13: {2: (0, 3), 17: (0, 22), 3: (1, {'@': 27})}, 14: {16: (0, 11), 14: (0, 32), 13: (0, 31)}, 15: {3: (1, {'@': 25}), 2: (1, {'@': 25})}, 16: {18: (0, 23), 3: (0, 0), 16: (0, 13), 13: (0, 31), 14: (0, 32)}, 17: {0: (1, {'@': 18}), 1: (1, {'@': 18}), 2: (1, {'@': 18}), 3: (1, {'@': 18})}, 18: {4: (0, 20), 5: (0, 5), 6: (0, 17), 8: (0, 4), 10: (0, 8), 11: (0, 16), 12: (0, 33), 13: (0, 31), 14: (0, 9), 15: (0, 26), 7: (0, 29)}, 19: {}, 20: {6: (0, 17), 8: (0, 4), 7: (0, 28), 11: (0, 16), 1: (0, 12), 4: (0, 20), 5: (0, 5), 10: (0, 8), 12: (0, 33), 13: (0, 31), 14: (0, 9), 15: (0, 26)}, 21: {0: (1, {'@': 23}), 1: (1, {'@': 23}), 2: (1, {'@': 23}), 3: (1, {'@': 23})}, 22: {2: (0, 14), 3: (1, {'@': 26})}, 23: {3: (0, 21)}, 24: {4: (0, 20), 5: (0, 5), 6: (0, 17), 8: (0, 4), 10: (0, 8), 11: (0, 16), 12: (0, 33), 13: (0, 31), 14: (0, 9), 15: (0, 26), 7: (0, 1)}, 25: {3: (1, {'@': 31}), 2: (1, {'@': 31})}, 26: {0: (1, {'@': 16}), 1: (1, {'@': 16}), 2: (1, {'@': 16}), 3: (1, {'@': 16})}, 27: {0: (1, {'@': 21}), 1: (1, {'@': 21}), 2: (1, {'@': 21}), 3: (1, {'@': 21})}, 28: {19: (0, 10), 2: (0, 18), 1: (0, 27)}, 29: {1: (1, {'@': 29}), 2: (1, {'@': 29})}, 30: {4: (0, 20), 5: (0, 5), 6: (0, 17), 7: (0, 15), 8: (0, 4), 10: (0, 8), 11: (0, 16), 12: (0, 33), 13: (0, 31), 14: (0, 9), 15: (0, 26)}, 31: {0: (1, {'@': 28}), 20: (1, {'@': 28}), 1: (1, {'@': 28}), 2: (1, {'@': 28}), 3: (1, {'@': 28})}, 32: {20: (0, 30)}, 33: {0: (1, {'@': 19}), 1: (1, {'@': 19}), 2: (1, {'@': 19}), 3: (1, {'@': 19})}}, 'start_states': {'start': 2}, 'end_states': {'start': 19}}, '__type__': 'ParsingFrontend'}, 'rules': [{'@': 12}, {'@': 13}, {'@': 14}, {'@': 15}, {'@': 16}, {'@': 17}, {'@': 18}, {'@': 19}, {'@': 20}, {'@': 21}, {'@': 22}, {'@': 23}, {'@': 24}, {'@': 25}, {'@': 26}, {'@': 27}, {'@': 28}, {'@': 29}, {'@': 30}, {'@': 31}, {'@': 32}], 'options': {'debug': False, 'keep_all_tokens': False, 'tree_class': None, 'cache': False, 'postlex': None, 'parser': 'lalr', 'lexer': 'contextual', 'transformer': None, 'start': ['start'], 'priority': 'normal', 'ambiguity': 'auto', 'regex': False, 'propagate_positions': True, 'lexer_callbacks': {}, 'maybe_placeholders': False, 'edit_terminals': None, 'g_regex_flags': 0, 'use_bytes': False, 'import_paths': [], 'source_path': None, '_plugins': {}}, '__type__': 'Lark'}
3043)
3044MEMO = (
3045{0: {'name': 'SIGNED_NUMBER', 'pattern': {'value': '(?:(?:\\+|\\-))?(?:(?:(?:[0-9])+(?:e|E)(?:(?:\\+|\\-))?(?:[0-9])+|(?:(?:[0-9])+\\.(?:(?:[0-9])+)?|\\.(?:[0-9])+)(?:(?:e|E)(?:(?:\\+|\\-))?(?:[0-9])+)?)|(?:[0-9])+)', 'flags': [], '_width': [1, 4294967295], '__type__': 'PatternRE'}, 'priority': 0, '__type__': 'TerminalDef'}, 1: {'name': 'ESCAPED_STRING', 'pattern': {'value': '".*?(?<!\\\\)(\\\\\\\\)*?"', 'flags': [], '_width': [2, 4294967295], '__type__': 'PatternRE'}, 'priority': 0, '__type__': 'TerminalDef'}, 2: {'name': 'WS', 'pattern': {'value': '(?:[ \t\x0c\r\n])+', 'flags': [], '_width': [1, 4294967295], '__type__': 'PatternRE'}, 'priority': 0, '__type__': 'TerminalDef'}, 3: {'name': 'COLON', 'pattern': {'value': ':', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 4: {'name': 'TRUE', 'pattern': {'value': 'true', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 5: {'name': 'FALSE', 'pattern': {'value': 'false', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 6: {'name': 'NULL', 'pattern': {'value': 'null', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 7: {'name': 'COMMA', 'pattern': {'value': ',', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 8: {'name': 'LSQB', 'pattern': {'value': '[', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 9: {'name': 'RSQB', 'pattern': {'value': ']', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 10: {'name': 'LBRACE', 'pattern': {'value': '{', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 11: {'name': 'RBRACE', 'pattern': {'value': '}', 'flags': [], '__type__': 'PatternStr'}, 'priority': 0, '__type__': 'TerminalDef'}, 12: {'origin': {'name': Token('RULE', 'start'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'value', '__type__': 'NonTerminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 13: {'origin': {'name': Token('RULE', 'value'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'object', '__type__': 'NonTerminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 14: {'origin': {'name': Token('RULE', 'value'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'array', '__type__': 'NonTerminal'}], 'order': 1, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 15: {'origin': {'name': Token('RULE', 'value'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'string', '__type__': 'NonTerminal'}], 'order': 2, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 16: {'origin': {'name': Token('RULE', 'value'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'SIGNED_NUMBER', 'filter_out': False, '__type__': 'Terminal'}], 'order': 3, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 17: {'origin': {'name': Token('RULE', 'value'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'TRUE', 'filter_out': True, '__type__': 'Terminal'}], 'order': 4, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 18: {'origin': {'name': Token('RULE', 'value'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'FALSE', 'filter_out': True, '__type__': 'Terminal'}], 'order': 5, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 19: {'origin': {'name': Token('RULE', 'value'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'NULL', 'filter_out': True, '__type__': 'Terminal'}], 'order': 6, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 20: {'origin': {'name': Token('RULE', 'array'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'LSQB', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'value', '__type__': 'NonTerminal'}, {'name': '__array_star_0', '__type__': 'NonTerminal'}, {'name': 'RSQB', 'filter_out': True, '__type__': 'Terminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 21: {'origin': {'name': Token('RULE', 'array'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'LSQB', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'value', '__type__': 'NonTerminal'}, {'name': 'RSQB', 'filter_out': True, '__type__': 'Terminal'}], 'order': 1, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 22: {'origin': {'name': Token('RULE', 'array'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'LSQB', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'RSQB', 'filter_out': True, '__type__': 'Terminal'}], 'order': 2, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': [False, True, False], '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 23: {'origin': {'name': Token('RULE', 'object'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'LBRACE', 'filter_out': True, '__type__': 'Terminal'}, {'name': '_items', '__type__': 'NonTerminal'}, {'name': 'RBRACE', 'filter_out': True, '__type__': 'Terminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 24: {'origin': {'name': Token('RULE', 'object'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'LBRACE', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'RBRACE', 'filter_out': True, '__type__': 'Terminal'}], 'order': 1, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 25: {'origin': {'name': Token('RULE', 'item'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'string', '__type__': 'NonTerminal'}, {'name': 'COLON', 'filter_out': False, '__type__': 'Terminal'}, {'name': 'value', '__type__': 'NonTerminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 26: {'origin': {'name': Token('RULE', '_items'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'item', '__type__': 'NonTerminal'}, {'name': '___items_star_1', '__type__': 'NonTerminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 27: {'origin': {'name': Token('RULE', '_items'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'item', '__type__': 'NonTerminal'}], 'order': 1, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 28: {'origin': {'name': Token('RULE', 'string'), '__type__': 'NonTerminal'}, 'expansion': [{'name': 'ESCAPED_STRING', 'filter_out': False, '__type__': 'Terminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 29: {'origin': {'name': '__array_star_0', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'COMMA', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'value', '__type__': 'NonTerminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 30: {'origin': {'name': '__array_star_0', '__type__': 'NonTerminal'}, 'expansion': [{'name': '__array_star_0', '__type__': 'NonTerminal'}, {'name': 'COMMA', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'value', '__type__': 'NonTerminal'}], 'order': 1, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 31: {'origin': {'name': '___items_star_1', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'COMMA', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'item', '__type__': 'NonTerminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 32: {'origin': {'name': '___items_star_1', '__type__': 'NonTerminal'}, 'expansion': [{'name': '___items_star_1', '__type__': 'NonTerminal'}, {'name': 'COMMA', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'item', '__type__': 'NonTerminal'}], 'order': 1, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}}
3046)
3047Shift = 0
3048Reduce = 1
3049def Lark_StandAlone(**kwargs):
3050 return Lark._load_from_dict(DATA, MEMO, **kwargs)