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86.5 kB
| # The file was automatically generated by Lark v0.9.0 | |
| __version__ = "0.9.0" | |
| # | |
| # | |
| # Lark Stand-alone Generator Tool | |
| # ---------------------------------- | |
| # Generates a stand-alone LALR(1) parser with a standard lexer | |
| # | |
| # Git: https://github.com/erezsh/lark | |
| # Author: Erez Shinan (erezshin@gmail.com) | |
| # | |
| # | |
| # >>> LICENSE | |
| # | |
| # This tool and its generated code use a separate license from Lark, | |
| # and are subject to the terms of the Mozilla Public License, v. 2.0. | |
| # If a copy of the MPL was not distributed with this | |
| # file, You can obtain one at https://mozilla.org/MPL/2.0/. | |
| # | |
| # If you wish to purchase a commercial license for this tool and its | |
| # generated code, you may contact me via email or otherwise. | |
| # | |
| # If MPL2 is incompatible with your free or open-source project, | |
| # contact me and we'll work it out. | |
| # | |
| # | |
| import os | |
| from io import open | |
| class LarkError(Exception): | |
| pass | |
| class GrammarError(LarkError): | |
| pass | |
| class ParseError(LarkError): | |
| pass | |
| class LexError(LarkError): | |
| pass | |
| class UnexpectedEOF(ParseError): | |
| def __init__(self, expected): | |
| self.expected = expected | |
| message = ("Unexpected end-of-input. Expected one of: \n\t* %s\n" % '\n\t* '.join(x.name for x in self.expected)) | |
| super(UnexpectedEOF, self).__init__(message) | |
| class UnexpectedInput(LarkError): | |
| #-- | |
| pos_in_stream = None | |
| def get_context(self, text, span=40): | |
| #-- | |
| pos = self.pos_in_stream | |
| start = max(pos - span, 0) | |
| end = pos + span | |
| if not isinstance(text, bytes): | |
| before = text[start:pos].rsplit('\n', 1)[-1] | |
| after = text[pos:end].split('\n', 1)[0] | |
| return before + after + '\n' + ' ' * len(before) + '^\n' | |
| else: | |
| before = text[start:pos].rsplit(b'\n', 1)[-1] | |
| after = text[pos:end].split(b'\n', 1)[0] | |
| return (before + after + b'\n' + b' ' * len(before) + b'^\n').decode("ascii", "backslashreplace") | |
| def match_examples(self, parse_fn, examples, token_type_match_fallback=False, use_accepts=False): | |
| #-- | |
| assert self.state is not None, "Not supported for this exception" | |
| if isinstance(examples, dict): | |
| examples = examples.items() | |
| candidate = (None, False) | |
| for i, (label, example) in enumerate(examples): | |
| assert not isinstance(example, STRING_TYPE) | |
| for j, malformed in enumerate(example): | |
| try: | |
| parse_fn(malformed) | |
| except UnexpectedInput as ut: | |
| if ut.state == self.state: | |
| if use_accepts and ut.accepts != self.accepts: | |
| logger.debug("Different accepts with same state[%d]: %s != %s at example [%s][%s]" % | |
| (self.state, self.accepts, ut.accepts, i, j)) | |
| continue | |
| try: | |
| if ut.token == self.token: ## | |
| logger.debug("Exact Match at example [%s][%s]" % (i, j)) | |
| return label | |
| if token_type_match_fallback: | |
| ## | |
| if (ut.token.type == self.token.type) and not candidate[-1]: | |
| logger.debug("Token Type Fallback at example [%s][%s]" % (i, j)) | |
| candidate = label, True | |
| except AttributeError: | |
| pass | |
| if not candidate[0]: | |
| logger.debug("Same State match at example [%s][%s]" % (i, j)) | |
| candidate = label, False | |
| return candidate[0] | |
| class UnexpectedCharacters(LexError, UnexpectedInput): | |
| def __init__(self, seq, lex_pos, line, column, allowed=None, considered_tokens=None, state=None, token_history=None): | |
| self.line = line | |
| self.column = column | |
| self.pos_in_stream = lex_pos | |
| self.state = state | |
| self.allowed = allowed | |
| self.considered_tokens = considered_tokens | |
| if isinstance(seq, bytes): | |
| _s = seq[lex_pos:lex_pos+1].decode("ascii", "backslashreplace") | |
| else: | |
| _s = seq[lex_pos] | |
| message = "No terminal defined for '%s' at line %d col %d" % (_s, line, column) | |
| message += '\n\n' + self.get_context(seq) | |
| if allowed: | |
| message += '\nExpecting: %s\n' % allowed | |
| if token_history: | |
| message += '\nPrevious tokens: %s\n' % ', '.join(repr(t) for t in token_history) | |
| super(UnexpectedCharacters, self).__init__(message) | |
| class UnexpectedToken(ParseError, UnexpectedInput): | |
| #-- | |
| def __init__(self, token, expected, considered_rules=None, state=None, puppet=None): | |
| self.line = getattr(token, 'line', '?') | |
| self.column = getattr(token, 'column', '?') | |
| self.pos_in_stream = getattr(token, 'pos_in_stream', None) | |
| self.state = state | |
| self.token = token | |
| self.expected = expected ## | |
| self.considered_rules = considered_rules | |
| self.puppet = puppet | |
| ## | |
| ## | |
| self.accepts = puppet and puppet.accepts() | |
| message = ("Unexpected token %r at line %s, column %s.\n" | |
| "Expected one of: \n\t* %s\n" | |
| % (token, self.line, self.column, '\n\t* '.join(self.accepts or self.expected))) | |
| super(UnexpectedToken, self).__init__(message) | |
| class VisitError(LarkError): | |
| #-- | |
| def __init__(self, rule, obj, orig_exc): | |
| self.obj = obj | |
| self.orig_exc = orig_exc | |
| message = 'Error trying to process rule "%s":\n\n%s' % (rule, orig_exc) | |
| super(VisitError, self).__init__(message) | |
| import logging | |
| logger = logging.getLogger("lark") | |
| logger.addHandler(logging.StreamHandler()) | |
| ## | |
| ## | |
| logger.setLevel(logging.CRITICAL) | |
| def classify(seq, key=None, value=None): | |
| d = {} | |
| for item in seq: | |
| k = key(item) if (key is not None) else item | |
| v = value(item) if (value is not None) else item | |
| if k in d: | |
| d[k].append(v) | |
| else: | |
| d[k] = [v] | |
| return d | |
| def _deserialize(data, namespace, memo): | |
| if isinstance(data, dict): | |
| if '__type__' in data: ## | |
| class_ = namespace[data['__type__']] | |
| return class_.deserialize(data, memo) | |
| elif '@' in data: | |
| return memo[data['@']] | |
| return {key:_deserialize(value, namespace, memo) for key, value in data.items()} | |
| elif isinstance(data, list): | |
| return [_deserialize(value, namespace, memo) for value in data] | |
| return data | |
| class Serialize(object): | |
| def memo_serialize(self, types_to_memoize): | |
| memo = SerializeMemoizer(types_to_memoize) | |
| return self.serialize(memo), memo.serialize() | |
| def serialize(self, memo=None): | |
| if memo and memo.in_types(self): | |
| return {'@': memo.memoized.get(self)} | |
| fields = getattr(self, '__serialize_fields__') | |
| res = {f: _serialize(getattr(self, f), memo) for f in fields} | |
| res['__type__'] = type(self).__name__ | |
| postprocess = getattr(self, '_serialize', None) | |
| if postprocess: | |
| postprocess(res, memo) | |
| return res | |
| def deserialize(cls, data, memo): | |
| namespace = getattr(cls, '__serialize_namespace__', {}) | |
| namespace = {c.__name__:c for c in namespace} | |
| fields = getattr(cls, '__serialize_fields__') | |
| if '@' in data: | |
| return memo[data['@']] | |
| inst = cls.__new__(cls) | |
| for f in fields: | |
| try: | |
| setattr(inst, f, _deserialize(data[f], namespace, memo)) | |
| except KeyError as e: | |
| raise KeyError("Cannot find key for class", cls, e) | |
| postprocess = getattr(inst, '_deserialize', None) | |
| if postprocess: | |
| postprocess() | |
| return inst | |
| class SerializeMemoizer(Serialize): | |
| __serialize_fields__ = 'memoized', | |
| def __init__(self, types_to_memoize): | |
| self.types_to_memoize = tuple(types_to_memoize) | |
| self.memoized = Enumerator() | |
| def in_types(self, value): | |
| return isinstance(value, self.types_to_memoize) | |
| def serialize(self): | |
| return _serialize(self.memoized.reversed(), None) | |
| def deserialize(cls, data, namespace, memo): | |
| return _deserialize(data, namespace, memo) | |
| try: | |
| STRING_TYPE = basestring | |
| except NameError: ## | |
| STRING_TYPE = str | |
| import types | |
| from functools import wraps, partial | |
| from contextlib import contextmanager | |
| Str = type(u'') | |
| try: | |
| classtype = types.ClassType ## | |
| except AttributeError: | |
| classtype = type ## | |
| def smart_decorator(f, create_decorator): | |
| if isinstance(f, types.FunctionType): | |
| return wraps(f)(create_decorator(f, True)) | |
| elif isinstance(f, (classtype, type, types.BuiltinFunctionType)): | |
| return wraps(f)(create_decorator(f, False)) | |
| elif isinstance(f, types.MethodType): | |
| return wraps(f)(create_decorator(f.__func__, True)) | |
| elif isinstance(f, partial): | |
| ## | |
| return wraps(f.func)(create_decorator(lambda *args, **kw: f(*args[1:], **kw), True)) | |
| else: | |
| return create_decorator(f.__func__.__call__, True) | |
| try: | |
| import regex | |
| except ImportError: | |
| regex = None | |
| import sys, re | |
| Py36 = (sys.version_info[:2] >= (3, 6)) | |
| import sre_parse | |
| import sre_constants | |
| categ_pattern = re.compile(r'\\p{[A-Za-z_]+}') | |
| def get_regexp_width(expr): | |
| if regex: | |
| ## | |
| ## | |
| ## | |
| regexp_final = re.sub(categ_pattern, 'A', expr) | |
| else: | |
| if re.search(categ_pattern, expr): | |
| raise ImportError('`regex` module must be installed in order to use Unicode categories.', expr) | |
| regexp_final = expr | |
| try: | |
| return [int(x) for x in sre_parse.parse(regexp_final).getwidth()] | |
| except sre_constants.error: | |
| raise ValueError(expr) | |
| from collections import OrderedDict | |
| class Meta: | |
| def __init__(self): | |
| self.empty = True | |
| class Tree(object): | |
| #-- | |
| def __init__(self, data, children, meta=None): | |
| self.data = data | |
| self.children = children | |
| self._meta = meta | |
| def meta(self): | |
| if self._meta is None: | |
| self._meta = Meta() | |
| return self._meta | |
| def __repr__(self): | |
| return 'Tree(%s, %s)' % (self.data, self.children) | |
| def _pretty_label(self): | |
| return self.data | |
| def _pretty(self, level, indent_str): | |
| if len(self.children) == 1 and not isinstance(self.children[0], Tree): | |
| return [ indent_str*level, self._pretty_label(), '\t', '%s' % (self.children[0],), '\n'] | |
| l = [ indent_str*level, self._pretty_label(), '\n' ] | |
| for n in self.children: | |
| if isinstance(n, Tree): | |
| l += n._pretty(level+1, indent_str) | |
| else: | |
| l += [ indent_str*(level+1), '%s' % (n,), '\n' ] | |
| return l | |
| def pretty(self, indent_str=' '): | |
| #-- | |
| return ''.join(self._pretty(0, indent_str)) | |
| def __eq__(self, other): | |
| try: | |
| return self.data == other.data and self.children == other.children | |
| except AttributeError: | |
| return False | |
| def __ne__(self, other): | |
| return not (self == other) | |
| def __hash__(self): | |
| return hash((self.data, tuple(self.children))) | |
| def iter_subtrees(self): | |
| #-- | |
| queue = [self] | |
| subtrees = OrderedDict() | |
| for subtree in queue: | |
| subtrees[id(subtree)] = subtree | |
| queue += [c for c in reversed(subtree.children) | |
| if isinstance(c, Tree) and id(c) not in subtrees] | |
| del queue | |
| return reversed(list(subtrees.values())) | |
| def find_pred(self, pred): | |
| #-- | |
| return filter(pred, self.iter_subtrees()) | |
| def find_data(self, data): | |
| #-- | |
| return self.find_pred(lambda t: t.data == data) | |
| from inspect import getmembers, getmro | |
| class Discard(Exception): | |
| #-- | |
| pass | |
| ## | |
| class _Decoratable: | |
| #-- | |
| def _apply_decorator(cls, decorator, **kwargs): | |
| mro = getmro(cls) | |
| assert mro[0] is cls | |
| libmembers = {name for _cls in mro[1:] for name, _ in getmembers(_cls)} | |
| for name, value in getmembers(cls): | |
| ## | |
| if name.startswith('_') or (name in libmembers and name not in cls.__dict__): | |
| continue | |
| if not callable(value): | |
| continue | |
| ## | |
| if hasattr(cls.__dict__[name], 'vargs_applied') or hasattr(value, 'vargs_applied'): | |
| continue | |
| static = isinstance(cls.__dict__[name], (staticmethod, classmethod)) | |
| setattr(cls, name, decorator(value, static=static, **kwargs)) | |
| return cls | |
| def __class_getitem__(cls, _): | |
| return cls | |
| class Transformer(_Decoratable): | |
| #-- | |
| __visit_tokens__ = True ## | |
| def __init__(self, visit_tokens=True): | |
| self.__visit_tokens__ = visit_tokens | |
| def _call_userfunc(self, tree, new_children=None): | |
| ## | |
| children = new_children if new_children is not None else tree.children | |
| try: | |
| f = getattr(self, tree.data) | |
| except AttributeError: | |
| return self.__default__(tree.data, children, tree.meta) | |
| else: | |
| try: | |
| wrapper = getattr(f, 'visit_wrapper', None) | |
| if wrapper is not None: | |
| return f.visit_wrapper(f, tree.data, children, tree.meta) | |
| else: | |
| return f(children) | |
| except (GrammarError, Discard): | |
| raise | |
| except Exception as e: | |
| raise VisitError(tree.data, tree, e) | |
| def _call_userfunc_token(self, token): | |
| try: | |
| f = getattr(self, token.type) | |
| except AttributeError: | |
| return self.__default_token__(token) | |
| else: | |
| try: | |
| return f(token) | |
| except (GrammarError, Discard): | |
| raise | |
| except Exception as e: | |
| raise VisitError(token.type, token, e) | |
| def _transform_children(self, children): | |
| for c in children: | |
| try: | |
| if isinstance(c, Tree): | |
| yield self._transform_tree(c) | |
| elif self.__visit_tokens__ and isinstance(c, Token): | |
| yield self._call_userfunc_token(c) | |
| else: | |
| yield c | |
| except Discard: | |
| pass | |
| def _transform_tree(self, tree): | |
| children = list(self._transform_children(tree.children)) | |
| return self._call_userfunc(tree, children) | |
| def transform(self, tree): | |
| return self._transform_tree(tree) | |
| def __mul__(self, other): | |
| return TransformerChain(self, other) | |
| def __default__(self, data, children, meta): | |
| #-- | |
| return Tree(data, children, meta) | |
| def __default_token__(self, token): | |
| #-- | |
| return token | |
| class InlineTransformer(Transformer): ## | |
| def _call_userfunc(self, tree, new_children=None): | |
| ## | |
| children = new_children if new_children is not None else tree.children | |
| try: | |
| f = getattr(self, tree.data) | |
| except AttributeError: | |
| return self.__default__(tree.data, children, tree.meta) | |
| else: | |
| return f(*children) | |
| class TransformerChain(object): | |
| def __init__(self, *transformers): | |
| self.transformers = transformers | |
| def transform(self, tree): | |
| for t in self.transformers: | |
| tree = t.transform(tree) | |
| return tree | |
| def __mul__(self, other): | |
| return TransformerChain(*self.transformers + (other,)) | |
| class Transformer_InPlace(Transformer): | |
| #-- | |
| def _transform_tree(self, tree): ## | |
| return self._call_userfunc(tree) | |
| def transform(self, tree): | |
| for subtree in tree.iter_subtrees(): | |
| subtree.children = list(self._transform_children(subtree.children)) | |
| return self._transform_tree(tree) | |
| class Transformer_NonRecursive(Transformer): | |
| #-- | |
| def transform(self, tree): | |
| ## | |
| rev_postfix = [] | |
| q = [tree] | |
| while q: | |
| t = q.pop() | |
| rev_postfix.append( t ) | |
| if isinstance(t, Tree): | |
| q += t.children | |
| ## | |
| stack = [] | |
| for x in reversed(rev_postfix): | |
| if isinstance(x, Tree): | |
| size = len(x.children) | |
| if size: | |
| args = stack[-size:] | |
| del stack[-size:] | |
| else: | |
| args = [] | |
| stack.append(self._call_userfunc(x, args)) | |
| else: | |
| stack.append(x) | |
| t ,= stack ## | |
| return t | |
| class Transformer_InPlaceRecursive(Transformer): | |
| #-- | |
| def _transform_tree(self, tree): | |
| tree.children = list(self._transform_children(tree.children)) | |
| return self._call_userfunc(tree) | |
| ## | |
| class VisitorBase: | |
| def _call_userfunc(self, tree): | |
| return getattr(self, tree.data, self.__default__)(tree) | |
| def __default__(self, tree): | |
| #-- | |
| return tree | |
| def __class_getitem__(cls, _): | |
| return cls | |
| class Visitor(VisitorBase): | |
| #-- | |
| def visit(self, tree): | |
| for subtree in tree.iter_subtrees(): | |
| self._call_userfunc(subtree) | |
| return tree | |
| def visit_topdown(self,tree): | |
| for subtree in tree.iter_subtrees_topdown(): | |
| self._call_userfunc(subtree) | |
| return tree | |
| class Visitor_Recursive(VisitorBase): | |
| #-- | |
| def visit(self, tree): | |
| for child in tree.children: | |
| if isinstance(child, Tree): | |
| self.visit(child) | |
| self._call_userfunc(tree) | |
| return tree | |
| def visit_topdown(self,tree): | |
| self._call_userfunc(tree) | |
| for child in tree.children: | |
| if isinstance(child, Tree): | |
| self.visit_topdown(child) | |
| return tree | |
| def visit_children_decor(func): | |
| #-- | |
| def inner(cls, tree): | |
| values = cls.visit_children(tree) | |
| return func(cls, values) | |
| return inner | |
| class Interpreter(_Decoratable): | |
| #-- | |
| def visit(self, tree): | |
| f = getattr(self, tree.data) | |
| wrapper = getattr(f, 'visit_wrapper', None) | |
| if wrapper is not None: | |
| return f.visit_wrapper(f, tree.data, tree.children, tree.meta) | |
| else: | |
| return f(tree) | |
| def visit_children(self, tree): | |
| return [self.visit(child) if isinstance(child, Tree) else child | |
| for child in tree.children] | |
| def __getattr__(self, name): | |
| return self.__default__ | |
| def __default__(self, tree): | |
| return self.visit_children(tree) | |
| ## | |
| def _apply_decorator(obj, decorator, **kwargs): | |
| try: | |
| _apply = obj._apply_decorator | |
| except AttributeError: | |
| return decorator(obj, **kwargs) | |
| else: | |
| return _apply(decorator, **kwargs) | |
| def _inline_args__func(func): | |
| def create_decorator(_f, with_self): | |
| if with_self: | |
| def f(self, children): | |
| return _f(self, *children) | |
| else: | |
| def f(self, children): | |
| return _f(*children) | |
| return f | |
| return smart_decorator(func, create_decorator) | |
| def inline_args(obj): ## | |
| return _apply_decorator(obj, _inline_args__func) | |
| def _visitor_args_func_dec(func, visit_wrapper=None, static=False): | |
| def create_decorator(_f, with_self): | |
| if with_self: | |
| def f(self, *args, **kwargs): | |
| return _f(self, *args, **kwargs) | |
| else: | |
| def f(self, *args, **kwargs): | |
| return _f(*args, **kwargs) | |
| return f | |
| if static: | |
| f = wraps(func)(create_decorator(func, False)) | |
| else: | |
| f = smart_decorator(func, create_decorator) | |
| f.vargs_applied = True | |
| f.visit_wrapper = visit_wrapper | |
| return f | |
| def _vargs_inline(f, data, children, meta): | |
| return f(*children) | |
| def _vargs_meta_inline(f, data, children, meta): | |
| return f(meta, *children) | |
| def _vargs_meta(f, data, children, meta): | |
| return f(children, meta) ## | |
| def _vargs_tree(f, data, children, meta): | |
| return f(Tree(data, children, meta)) | |
| def v_args(inline=False, meta=False, tree=False, wrapper=None): | |
| #-- | |
| if tree and (meta or inline): | |
| raise ValueError("Visitor functions cannot combine 'tree' with 'meta' or 'inline'.") | |
| func = None | |
| if meta: | |
| if inline: | |
| func = _vargs_meta_inline | |
| else: | |
| func = _vargs_meta | |
| elif inline: | |
| func = _vargs_inline | |
| elif tree: | |
| func = _vargs_tree | |
| if wrapper is not None: | |
| if func is not None: | |
| raise ValueError("Cannot use 'wrapper' along with 'tree', 'meta' or 'inline'.") | |
| func = wrapper | |
| def _visitor_args_dec(obj): | |
| return _apply_decorator(obj, _visitor_args_func_dec, visit_wrapper=func) | |
| return _visitor_args_dec | |
| class Indenter: | |
| def __init__(self): | |
| self.paren_level = None | |
| self.indent_level = None | |
| assert self.tab_len > 0 | |
| def handle_NL(self, token): | |
| if self.paren_level > 0: | |
| return | |
| yield token | |
| indent_str = token.rsplit('\n', 1)[1] ## | |
| indent = indent_str.count(' ') + indent_str.count('\t') * self.tab_len | |
| if indent > self.indent_level[-1]: | |
| self.indent_level.append(indent) | |
| yield Token.new_borrow_pos(self.INDENT_type, indent_str, token) | |
| else: | |
| while indent < self.indent_level[-1]: | |
| self.indent_level.pop() | |
| yield Token.new_borrow_pos(self.DEDENT_type, indent_str, token) | |
| assert indent == self.indent_level[-1], '%s != %s' % (indent, self.indent_level[-1]) | |
| def _process(self, stream): | |
| for token in stream: | |
| if token.type == self.NL_type: | |
| for t in self.handle_NL(token): | |
| yield t | |
| else: | |
| yield token | |
| if token.type in self.OPEN_PAREN_types: | |
| self.paren_level += 1 | |
| elif token.type in self.CLOSE_PAREN_types: | |
| self.paren_level -= 1 | |
| assert self.paren_level >= 0 | |
| while len(self.indent_level) > 1: | |
| self.indent_level.pop() | |
| yield Token(self.DEDENT_type, '') | |
| assert self.indent_level == [0], self.indent_level | |
| def process(self, stream): | |
| self.paren_level = 0 | |
| self.indent_level = [0] | |
| return self._process(stream) | |
| ## | |
| def always_accept(self): | |
| return (self.NL_type,) | |
| class Symbol(Serialize): | |
| __slots__ = ('name',) | |
| is_term = NotImplemented | |
| def __init__(self, name): | |
| self.name = name | |
| def __eq__(self, other): | |
| assert isinstance(other, Symbol), other | |
| return self.is_term == other.is_term and self.name == other.name | |
| def __ne__(self, other): | |
| return not (self == other) | |
| def __hash__(self): | |
| return hash(self.name) | |
| def __repr__(self): | |
| return '%s(%r)' % (type(self).__name__, self.name) | |
| fullrepr = property(__repr__) | |
| class Terminal(Symbol): | |
| __serialize_fields__ = 'name', 'filter_out' | |
| is_term = True | |
| def __init__(self, name, filter_out=False): | |
| self.name = name | |
| self.filter_out = filter_out | |
| def fullrepr(self): | |
| return '%s(%r, %r)' % (type(self).__name__, self.name, self.filter_out) | |
| class NonTerminal(Symbol): | |
| __serialize_fields__ = 'name', | |
| is_term = False | |
| class RuleOptions(Serialize): | |
| __serialize_fields__ = 'keep_all_tokens', 'expand1', 'priority', 'template_source', 'empty_indices' | |
| def __init__(self, keep_all_tokens=False, expand1=False, priority=None, template_source=None, empty_indices=()): | |
| self.keep_all_tokens = keep_all_tokens | |
| self.expand1 = expand1 | |
| self.priority = priority | |
| self.template_source = template_source | |
| self.empty_indices = empty_indices | |
| def __repr__(self): | |
| return 'RuleOptions(%r, %r, %r, %r)' % ( | |
| self.keep_all_tokens, | |
| self.expand1, | |
| self.priority, | |
| self.template_source | |
| ) | |
| class Rule(Serialize): | |
| #-- | |
| __slots__ = ('origin', 'expansion', 'alias', 'options', 'order', '_hash') | |
| __serialize_fields__ = 'origin', 'expansion', 'order', 'alias', 'options' | |
| __serialize_namespace__ = Terminal, NonTerminal, RuleOptions | |
| def __init__(self, origin, expansion, order=0, alias=None, options=None): | |
| self.origin = origin | |
| self.expansion = expansion | |
| self.alias = alias | |
| self.order = order | |
| self.options = options or RuleOptions() | |
| self._hash = hash((self.origin, tuple(self.expansion))) | |
| def _deserialize(self): | |
| self._hash = hash((self.origin, tuple(self.expansion))) | |
| def __str__(self): | |
| return '<%s : %s>' % (self.origin.name, ' '.join(x.name for x in self.expansion)) | |
| def __repr__(self): | |
| return 'Rule(%r, %r, %r, %r)' % (self.origin, self.expansion, self.alias, self.options) | |
| def __hash__(self): | |
| return self._hash | |
| def __eq__(self, other): | |
| if not isinstance(other, Rule): | |
| return False | |
| return self.origin == other.origin and self.expansion == other.expansion | |
| from copy import copy | |
| class Pattern(Serialize): | |
| def __init__(self, value, flags=()): | |
| self.value = value | |
| self.flags = frozenset(flags) | |
| def __repr__(self): | |
| return repr(self.to_regexp()) | |
| ## | |
| def __hash__(self): | |
| return hash((type(self), self.value, self.flags)) | |
| def __eq__(self, other): | |
| return type(self) == type(other) and self.value == other.value and self.flags == other.flags | |
| def to_regexp(self): | |
| raise NotImplementedError() | |
| if Py36: | |
| ## | |
| def _get_flags(self, value): | |
| for f in self.flags: | |
| value = ('(?%s:%s)' % (f, value)) | |
| return value | |
| else: | |
| def _get_flags(self, value): | |
| for f in self.flags: | |
| value = ('(?%s)' % f) + value | |
| return value | |
| class PatternStr(Pattern): | |
| __serialize_fields__ = 'value', 'flags' | |
| type = "str" | |
| def to_regexp(self): | |
| return self._get_flags(re.escape(self.value)) | |
| def min_width(self): | |
| return len(self.value) | |
| max_width = min_width | |
| class PatternRE(Pattern): | |
| __serialize_fields__ = 'value', 'flags', '_width' | |
| type = "re" | |
| def to_regexp(self): | |
| return self._get_flags(self.value) | |
| _width = None | |
| def _get_width(self): | |
| if self._width is None: | |
| self._width = get_regexp_width(self.to_regexp()) | |
| return self._width | |
| def min_width(self): | |
| return self._get_width()[0] | |
| def max_width(self): | |
| return self._get_width()[1] | |
| class TerminalDef(Serialize): | |
| __serialize_fields__ = 'name', 'pattern', 'priority' | |
| __serialize_namespace__ = PatternStr, PatternRE | |
| def __init__(self, name, pattern, priority=1): | |
| assert isinstance(pattern, Pattern), pattern | |
| self.name = name | |
| self.pattern = pattern | |
| self.priority = priority | |
| def __repr__(self): | |
| return '%s(%r, %r)' % (type(self).__name__, self.name, self.pattern) | |
| class Token(Str): | |
| #-- | |
| __slots__ = ('type', 'pos_in_stream', 'value', 'line', 'column', 'end_line', 'end_column', 'end_pos') | |
| def __new__(cls, type_, value, pos_in_stream=None, line=None, column=None, end_line=None, end_column=None, end_pos=None): | |
| try: | |
| self = super(Token, cls).__new__(cls, value) | |
| except UnicodeDecodeError: | |
| value = value.decode('latin1') | |
| self = super(Token, cls).__new__(cls, value) | |
| self.type = type_ | |
| self.pos_in_stream = pos_in_stream | |
| self.value = value | |
| self.line = line | |
| self.column = column | |
| self.end_line = end_line | |
| self.end_column = end_column | |
| self.end_pos = end_pos | |
| return self | |
| def update(self, type_=None, value=None): | |
| return Token.new_borrow_pos( | |
| type_ if type_ is not None else self.type, | |
| value if value is not None else self.value, | |
| self | |
| ) | |
| def new_borrow_pos(cls, type_, value, borrow_t): | |
| return cls(type_, value, borrow_t.pos_in_stream, borrow_t.line, borrow_t.column, borrow_t.end_line, borrow_t.end_column, borrow_t.end_pos) | |
| def __reduce__(self): | |
| return (self.__class__, (self.type, self.value, self.pos_in_stream, self.line, self.column, )) | |
| def __repr__(self): | |
| return 'Token(%s, %r)' % (self.type, self.value) | |
| def __deepcopy__(self, memo): | |
| return Token(self.type, self.value, self.pos_in_stream, self.line, self.column) | |
| def __eq__(self, other): | |
| if isinstance(other, Token) and self.type != other.type: | |
| return False | |
| return Str.__eq__(self, other) | |
| __hash__ = Str.__hash__ | |
| class LineCounter: | |
| def __init__(self, newline_char): | |
| self.newline_char = newline_char | |
| self.char_pos = 0 | |
| self.line = 1 | |
| self.column = 1 | |
| self.line_start_pos = 0 | |
| def feed(self, token, test_newline=True): | |
| #-- | |
| if test_newline: | |
| newlines = token.count(self.newline_char) | |
| if newlines: | |
| self.line += newlines | |
| self.line_start_pos = self.char_pos + token.rindex(self.newline_char) + 1 | |
| self.char_pos += len(token) | |
| self.column = self.char_pos - self.line_start_pos + 1 | |
| class _Lex: | |
| #-- | |
| def __init__(self, lexer, state=None): | |
| self.lexer = lexer | |
| self.state = state | |
| def lex(self, stream, newline_types, ignore_types): | |
| newline_types = frozenset(newline_types) | |
| ignore_types = frozenset(ignore_types) | |
| line_ctr = LineCounter('\n' if not self.lexer.use_bytes else b'\n') | |
| last_token = None | |
| while line_ctr.char_pos < len(stream): | |
| lexer = self.lexer | |
| res = lexer.match(stream, line_ctr.char_pos) | |
| if not res: | |
| allowed = {v for m, tfi in lexer.mres for v in tfi.values()} - ignore_types | |
| if not allowed: | |
| allowed = {"<END-OF-FILE>"} | |
| raise UnexpectedCharacters(stream, line_ctr.char_pos, line_ctr.line, line_ctr.column, allowed=allowed, state=self.state, token_history=last_token and [last_token]) | |
| value, type_ = res | |
| if type_ not in ignore_types: | |
| t = Token(type_, value, line_ctr.char_pos, line_ctr.line, line_ctr.column) | |
| line_ctr.feed(value, type_ in newline_types) | |
| t.end_line = line_ctr.line | |
| t.end_column = line_ctr.column | |
| t.end_pos = line_ctr.char_pos | |
| if t.type in lexer.callback: | |
| t = lexer.callback[t.type](t) | |
| if not isinstance(t, Token): | |
| raise ValueError("Callbacks must return a token (returned %r)" % t) | |
| yield t | |
| last_token = t | |
| else: | |
| if type_ in lexer.callback: | |
| t2 = Token(type_, value, line_ctr.char_pos, line_ctr.line, line_ctr.column) | |
| lexer.callback[type_](t2) | |
| line_ctr.feed(value, type_ in newline_types) | |
| class UnlessCallback: | |
| def __init__(self, mres): | |
| self.mres = mres | |
| def __call__(self, t): | |
| for mre, type_from_index in self.mres: | |
| m = mre.match(t.value) | |
| if m: | |
| t.type = type_from_index[m.lastindex] | |
| break | |
| return t | |
| class CallChain: | |
| def __init__(self, callback1, callback2, cond): | |
| self.callback1 = callback1 | |
| self.callback2 = callback2 | |
| self.cond = cond | |
| def __call__(self, t): | |
| t2 = self.callback1(t) | |
| return self.callback2(t) if self.cond(t2) else t2 | |
| def _create_unless(terminals, g_regex_flags, re_, use_bytes): | |
| tokens_by_type = classify(terminals, lambda t: type(t.pattern)) | |
| assert len(tokens_by_type) <= 2, tokens_by_type.keys() | |
| embedded_strs = set() | |
| callback = {} | |
| for retok in tokens_by_type.get(PatternRE, []): | |
| unless = [] ## | |
| for strtok in tokens_by_type.get(PatternStr, []): | |
| if strtok.priority > retok.priority: | |
| continue | |
| s = strtok.pattern.value | |
| m = re_.match(retok.pattern.to_regexp(), s, g_regex_flags) | |
| if m and m.group(0) == s: | |
| unless.append(strtok) | |
| if strtok.pattern.flags <= retok.pattern.flags: | |
| embedded_strs.add(strtok) | |
| if unless: | |
| callback[retok.name] = UnlessCallback(build_mres(unless, g_regex_flags, re_, match_whole=True, use_bytes=use_bytes)) | |
| terminals = [t for t in terminals if t not in embedded_strs] | |
| return terminals, callback | |
| def _build_mres(terminals, max_size, g_regex_flags, match_whole, re_, use_bytes): | |
| ## | |
| ## | |
| ## | |
| postfix = '$' if match_whole else '' | |
| mres = [] | |
| while terminals: | |
| pattern = u'|'.join(u'(?P<%s>%s)' % (t.name, t.pattern.to_regexp() + postfix) for t in terminals[:max_size]) | |
| if use_bytes: | |
| pattern = pattern.encode('latin-1') | |
| try: | |
| mre = re_.compile(pattern, g_regex_flags) | |
| except AssertionError: ## | |
| return _build_mres(terminals, max_size//2, g_regex_flags, match_whole, re_, use_bytes) | |
| ## | |
| mres.append((mre, {i:n for n,i in mre.groupindex.items()} )) | |
| terminals = terminals[max_size:] | |
| return mres | |
| def build_mres(terminals, g_regex_flags, re_, use_bytes, match_whole=False): | |
| return _build_mres(terminals, len(terminals), g_regex_flags, match_whole, re_, use_bytes) | |
| def _regexp_has_newline(r): | |
| #-- | |
| return '\n' in r or '\\n' in r or '\\s' in r or '[^' in r or ('(?s' in r and '.' in r) | |
| class Lexer(object): | |
| #-- | |
| lex = NotImplemented | |
| class TraditionalLexer(Lexer): | |
| def __init__(self, conf): | |
| terminals = list(conf.tokens) | |
| assert all(isinstance(t, TerminalDef) for t in terminals), terminals | |
| self.re = conf.re_module | |
| if not conf.skip_validation: | |
| ## | |
| for t in terminals: | |
| try: | |
| self.re.compile(t.pattern.to_regexp(), conf.g_regex_flags) | |
| except self.re.error: | |
| raise LexError("Cannot compile token %s: %s" % (t.name, t.pattern)) | |
| if t.pattern.min_width == 0: | |
| raise LexError("Lexer does not allow zero-width terminals. (%s: %s)" % (t.name, t.pattern)) | |
| assert set(conf.ignore) <= {t.name for t in terminals} | |
| ## | |
| self.newline_types = [t.name for t in terminals if _regexp_has_newline(t.pattern.to_regexp())] | |
| self.ignore_types = list(conf.ignore) | |
| terminals.sort(key=lambda x:(-x.priority, -x.pattern.max_width, -len(x.pattern.value), x.name)) | |
| self.terminals = terminals | |
| self.user_callbacks = conf.callbacks | |
| self.g_regex_flags = conf.g_regex_flags | |
| self.use_bytes = conf.use_bytes | |
| self._mres = None | |
| ## | |
| def _build(self): | |
| terminals, self.callback = _create_unless(self.terminals, self.g_regex_flags, re_=self.re, use_bytes=self.use_bytes) | |
| assert all(self.callback.values()) | |
| for type_, f in self.user_callbacks.items(): | |
| if type_ in self.callback: | |
| ## | |
| self.callback[type_] = CallChain(self.callback[type_], f, lambda t: t.type == type_) | |
| else: | |
| self.callback[type_] = f | |
| self._mres = build_mres(terminals, self.g_regex_flags, self.re, self.use_bytes) | |
| def mres(self): | |
| if self._mres is None: | |
| self._build() | |
| return self._mres | |
| def match(self, stream, pos): | |
| for mre, type_from_index in self.mres: | |
| m = mre.match(stream, pos) | |
| if m: | |
| return m.group(0), type_from_index[m.lastindex] | |
| def lex(self, stream): | |
| return _Lex(self).lex(stream, self.newline_types, self.ignore_types) | |
| class ContextualLexer(Lexer): | |
| def __init__(self, conf, states, always_accept=()): | |
| terminals = list(conf.tokens) | |
| tokens_by_name = {} | |
| for t in terminals: | |
| assert t.name not in tokens_by_name, t | |
| tokens_by_name[t.name] = t | |
| trad_conf = copy(conf) | |
| trad_conf.tokens = terminals | |
| lexer_by_tokens = {} | |
| self.lexers = {} | |
| for state, accepts in states.items(): | |
| key = frozenset(accepts) | |
| try: | |
| lexer = lexer_by_tokens[key] | |
| except KeyError: | |
| accepts = set(accepts) | set(conf.ignore) | set(always_accept) | |
| state_tokens = [tokens_by_name[n] for n in accepts if n and n in tokens_by_name] | |
| lexer_conf = copy(trad_conf) | |
| lexer_conf.tokens = state_tokens | |
| lexer = TraditionalLexer(lexer_conf) | |
| lexer_by_tokens[key] = lexer | |
| self.lexers[state] = lexer | |
| assert trad_conf.tokens is terminals | |
| self.root_lexer = TraditionalLexer(trad_conf) | |
| def lex(self, stream, get_parser_state): | |
| parser_state = get_parser_state() | |
| l = _Lex(self.lexers[parser_state], parser_state) | |
| try: | |
| for x in l.lex(stream, self.root_lexer.newline_types, self.root_lexer.ignore_types): | |
| yield x | |
| parser_state = get_parser_state() | |
| l.lexer = self.lexers[parser_state] | |
| l.state = parser_state ## | |
| except UnexpectedCharacters as e: | |
| ## | |
| ## | |
| ## | |
| root_match = self.root_lexer.match(stream, e.pos_in_stream) | |
| if not root_match: | |
| raise | |
| value, type_ = root_match | |
| t = Token(type_, value, e.pos_in_stream, e.line, e.column) | |
| raise UnexpectedToken(t, e.allowed, state=e.state) | |
| class LexerConf(Serialize): | |
| __serialize_fields__ = 'tokens', 'ignore', 'g_regex_flags', 'use_bytes' | |
| __serialize_namespace__ = TerminalDef, | |
| def __init__(self, tokens, re_module, ignore=(), postlex=None, callbacks=None, g_regex_flags=0, skip_validation=False, use_bytes=False): | |
| self.tokens = tokens ## | |
| self.ignore = ignore | |
| self.postlex = postlex | |
| self.callbacks = callbacks or {} | |
| self.g_regex_flags = g_regex_flags | |
| self.re_module = re_module | |
| self.skip_validation = skip_validation | |
| self.use_bytes = use_bytes | |
| from functools import partial, wraps | |
| from itertools import repeat, product | |
| class ExpandSingleChild: | |
| def __init__(self, node_builder): | |
| self.node_builder = node_builder | |
| def __call__(self, children): | |
| if len(children) == 1: | |
| return children[0] | |
| else: | |
| return self.node_builder(children) | |
| class PropagatePositions: | |
| def __init__(self, node_builder): | |
| self.node_builder = node_builder | |
| def __call__(self, children): | |
| res = self.node_builder(children) | |
| ## | |
| if isinstance(res, Tree): | |
| res_meta = res.meta | |
| for c in children: | |
| if isinstance(c, Tree): | |
| child_meta = c.meta | |
| if not child_meta.empty: | |
| res_meta.line = child_meta.line | |
| res_meta.column = child_meta.column | |
| res_meta.start_pos = child_meta.start_pos | |
| res_meta.empty = False | |
| break | |
| elif isinstance(c, Token): | |
| res_meta.line = c.line | |
| res_meta.column = c.column | |
| res_meta.start_pos = c.pos_in_stream | |
| res_meta.empty = False | |
| break | |
| for c in reversed(children): | |
| if isinstance(c, Tree): | |
| child_meta = c.meta | |
| if not child_meta.empty: | |
| res_meta.end_line = child_meta.end_line | |
| res_meta.end_column = child_meta.end_column | |
| res_meta.end_pos = child_meta.end_pos | |
| res_meta.empty = False | |
| break | |
| elif isinstance(c, Token): | |
| res_meta.end_line = c.end_line | |
| res_meta.end_column = c.end_column | |
| res_meta.end_pos = c.end_pos | |
| res_meta.empty = False | |
| break | |
| return res | |
| class ChildFilter: | |
| def __init__(self, to_include, append_none, node_builder): | |
| self.node_builder = node_builder | |
| self.to_include = to_include | |
| self.append_none = append_none | |
| def __call__(self, children): | |
| filtered = [] | |
| for i, to_expand, add_none in self.to_include: | |
| if add_none: | |
| filtered += [None] * add_none | |
| if to_expand: | |
| filtered += children[i].children | |
| else: | |
| filtered.append(children[i]) | |
| if self.append_none: | |
| filtered += [None] * self.append_none | |
| return self.node_builder(filtered) | |
| class ChildFilterLALR(ChildFilter): | |
| #-- | |
| def __call__(self, children): | |
| filtered = [] | |
| for i, to_expand, add_none in self.to_include: | |
| if add_none: | |
| filtered += [None] * add_none | |
| if to_expand: | |
| if filtered: | |
| filtered += children[i].children | |
| else: ## | |
| filtered = children[i].children | |
| else: | |
| filtered.append(children[i]) | |
| if self.append_none: | |
| filtered += [None] * self.append_none | |
| return self.node_builder(filtered) | |
| class ChildFilterLALR_NoPlaceholders(ChildFilter): | |
| #-- | |
| def __init__(self, to_include, node_builder): | |
| self.node_builder = node_builder | |
| self.to_include = to_include | |
| def __call__(self, children): | |
| filtered = [] | |
| for i, to_expand in self.to_include: | |
| if to_expand: | |
| if filtered: | |
| filtered += children[i].children | |
| else: ## | |
| filtered = children[i].children | |
| else: | |
| filtered.append(children[i]) | |
| return self.node_builder(filtered) | |
| def _should_expand(sym): | |
| return not sym.is_term and sym.name.startswith('_') | |
| def maybe_create_child_filter(expansion, keep_all_tokens, ambiguous, _empty_indices): | |
| ## | |
| if _empty_indices: | |
| assert _empty_indices.count(False) == len(expansion) | |
| s = ''.join(str(int(b)) for b in _empty_indices) | |
| empty_indices = [len(ones) for ones in s.split('0')] | |
| assert len(empty_indices) == len(expansion)+1, (empty_indices, len(expansion)) | |
| else: | |
| empty_indices = [0] * (len(expansion)+1) | |
| to_include = [] | |
| nones_to_add = 0 | |
| for i, sym in enumerate(expansion): | |
| nones_to_add += empty_indices[i] | |
| if keep_all_tokens or not (sym.is_term and sym.filter_out): | |
| to_include.append((i, _should_expand(sym), nones_to_add)) | |
| nones_to_add = 0 | |
| nones_to_add += empty_indices[len(expansion)] | |
| if _empty_indices or len(to_include) < len(expansion) or any(to_expand for i, to_expand,_ in to_include): | |
| if _empty_indices or ambiguous: | |
| return partial(ChildFilter if ambiguous else ChildFilterLALR, to_include, nones_to_add) | |
| else: | |
| ## | |
| return partial(ChildFilterLALR_NoPlaceholders, [(i, x) for i,x,_ in to_include]) | |
| class AmbiguousExpander: | |
| #-- | |
| def __init__(self, to_expand, tree_class, node_builder): | |
| self.node_builder = node_builder | |
| self.tree_class = tree_class | |
| self.to_expand = to_expand | |
| def __call__(self, children): | |
| def _is_ambig_tree(child): | |
| return hasattr(child, 'data') and child.data == '_ambig' | |
| ## | |
| ## | |
| ## | |
| ## | |
| ambiguous = [] | |
| for i, child in enumerate(children): | |
| if _is_ambig_tree(child): | |
| if i in self.to_expand: | |
| ambiguous.append(i) | |
| to_expand = [j for j, grandchild in enumerate(child.children) if _is_ambig_tree(grandchild)] | |
| child.expand_kids_by_index(*to_expand) | |
| if not ambiguous: | |
| return self.node_builder(children) | |
| expand = [ iter(child.children) if i in ambiguous else repeat(child) for i, child in enumerate(children) ] | |
| return self.tree_class('_ambig', [self.node_builder(list(f[0])) for f in product(zip(*expand))]) | |
| def maybe_create_ambiguous_expander(tree_class, expansion, keep_all_tokens): | |
| to_expand = [i for i, sym in enumerate(expansion) | |
| if keep_all_tokens or ((not (sym.is_term and sym.filter_out)) and _should_expand(sym))] | |
| if to_expand: | |
| return partial(AmbiguousExpander, to_expand, tree_class) | |
| def ptb_inline_args(func): | |
| def f(children): | |
| return func(*children) | |
| return f | |
| def inplace_transformer(func): | |
| def f(children): | |
| ## | |
| tree = Tree(func.__name__, children) | |
| return func(tree) | |
| return f | |
| def apply_visit_wrapper(func, name, wrapper): | |
| if wrapper is _vargs_meta or wrapper is _vargs_meta_inline: | |
| raise NotImplementedError("Meta args not supported for internal transformer") | |
| def f(children): | |
| return wrapper(func, name, children, None) | |
| return f | |
| class ParseTreeBuilder: | |
| def __init__(self, rules, tree_class, propagate_positions=False, keep_all_tokens=False, ambiguous=False, maybe_placeholders=False): | |
| self.tree_class = tree_class | |
| self.propagate_positions = propagate_positions | |
| self.always_keep_all_tokens = keep_all_tokens | |
| self.ambiguous = ambiguous | |
| self.maybe_placeholders = maybe_placeholders | |
| self.rule_builders = list(self._init_builders(rules)) | |
| def _init_builders(self, rules): | |
| for rule in rules: | |
| options = rule.options | |
| keep_all_tokens = self.always_keep_all_tokens or options.keep_all_tokens | |
| expand_single_child = options.expand1 | |
| wrapper_chain = list(filter(None, [ | |
| (expand_single_child and not rule.alias) and ExpandSingleChild, | |
| maybe_create_child_filter(rule.expansion, keep_all_tokens, self.ambiguous, options.empty_indices if self.maybe_placeholders else None), | |
| self.propagate_positions and PropagatePositions, | |
| self.ambiguous and maybe_create_ambiguous_expander(self.tree_class, rule.expansion, keep_all_tokens), | |
| ])) | |
| yield rule, wrapper_chain | |
| def create_callback(self, transformer=None): | |
| callbacks = {} | |
| for rule, wrapper_chain in self.rule_builders: | |
| user_callback_name = rule.alias or rule.options.template_source or rule.origin.name | |
| try: | |
| f = getattr(transformer, user_callback_name) | |
| ## | |
| wrapper = getattr(f, 'visit_wrapper', None) | |
| if wrapper is not None: | |
| f = apply_visit_wrapper(f, user_callback_name, wrapper) | |
| else: | |
| if isinstance(transformer, InlineTransformer): | |
| f = ptb_inline_args(f) | |
| elif isinstance(transformer, Transformer_InPlace): | |
| f = inplace_transformer(f) | |
| except AttributeError: | |
| f = partial(self.tree_class, user_callback_name) | |
| for w in wrapper_chain: | |
| f = w(f) | |
| if rule in callbacks: | |
| raise GrammarError("Rule '%s' already exists" % (rule,)) | |
| callbacks[rule] = f | |
| return callbacks | |
| class LALR_Parser(object): | |
| def __init__(self, parser_conf, debug=False): | |
| assert all(r.options.priority is None for r in parser_conf.rules), "LALR doesn't yet support prioritization" | |
| analysis = LALR_Analyzer(parser_conf, debug=debug) | |
| analysis.compute_lalr() | |
| callbacks = parser_conf.callbacks | |
| self._parse_table = analysis.parse_table | |
| self.parser_conf = parser_conf | |
| self.parser = _Parser(analysis.parse_table, callbacks, debug) | |
| def deserialize(cls, data, memo, callbacks): | |
| inst = cls.__new__(cls) | |
| inst._parse_table = IntParseTable.deserialize(data, memo) | |
| inst.parser = _Parser(inst._parse_table, callbacks) | |
| return inst | |
| def serialize(self, memo): | |
| return self._parse_table.serialize(memo) | |
| def parse(self, *args): | |
| return self.parser.parse(*args) | |
| class _Parser: | |
| def __init__(self, parse_table, callbacks, debug=False): | |
| self.parse_table = parse_table | |
| self.callbacks = callbacks | |
| self.debug = debug | |
| def parse(self, seq, start, set_state=None, value_stack=None, state_stack=None): | |
| token = None | |
| stream = iter(seq) | |
| states = self.parse_table.states | |
| start_state = self.parse_table.start_states[start] | |
| end_state = self.parse_table.end_states[start] | |
| state_stack = state_stack or [start_state] | |
| value_stack = value_stack or [] | |
| if set_state: set_state(start_state) | |
| def get_action(token): | |
| state = state_stack[-1] | |
| try: | |
| return states[state][token.type] | |
| except KeyError: | |
| expected = {s for s in states[state].keys() if s.isupper()} | |
| try: | |
| puppet = ParserPuppet(self, state_stack, value_stack, start, stream, set_state) | |
| except NameError: ## | |
| puppet = None | |
| raise UnexpectedToken(token, expected, state=state, puppet=puppet) | |
| def reduce(rule): | |
| size = len(rule.expansion) | |
| if size: | |
| s = value_stack[-size:] | |
| del state_stack[-size:] | |
| del value_stack[-size:] | |
| else: | |
| s = [] | |
| value = self.callbacks[rule](s) | |
| _action, new_state = states[state_stack[-1]][rule.origin.name] | |
| assert _action is Shift | |
| state_stack.append(new_state) | |
| value_stack.append(value) | |
| ## | |
| try: | |
| for token in stream: | |
| while True: | |
| action, arg = get_action(token) | |
| assert arg != end_state | |
| if action is Shift: | |
| state_stack.append(arg) | |
| value_stack.append(token) | |
| if set_state: set_state(arg) | |
| break ## | |
| else: | |
| reduce(arg) | |
| except Exception as e: | |
| if self.debug: | |
| print("") | |
| print("STATE STACK DUMP") | |
| print("----------------") | |
| for i, s in enumerate(state_stack): | |
| print('%d)' % i , s) | |
| print("") | |
| raise | |
| token = Token.new_borrow_pos('$END', '', token) if token else Token('$END', '', 0, 1, 1) | |
| while True: | |
| _action, arg = get_action(token) | |
| assert(_action is Reduce) | |
| reduce(arg) | |
| if state_stack[-1] == end_state: | |
| return value_stack[-1] | |
| class Action: | |
| def __init__(self, name): | |
| self.name = name | |
| def __str__(self): | |
| return self.name | |
| def __repr__(self): | |
| return str(self) | |
| Shift = Action('Shift') | |
| Reduce = Action('Reduce') | |
| class ParseTable: | |
| def __init__(self, states, start_states, end_states): | |
| self.states = states | |
| self.start_states = start_states | |
| self.end_states = end_states | |
| def serialize(self, memo): | |
| tokens = Enumerator() | |
| rules = Enumerator() | |
| states = { | |
| state: {tokens.get(token): ((1, arg.serialize(memo)) if action is Reduce else (0, arg)) | |
| for token, (action, arg) in actions.items()} | |
| for state, actions in self.states.items() | |
| } | |
| return { | |
| 'tokens': tokens.reversed(), | |
| 'states': states, | |
| 'start_states': self.start_states, | |
| 'end_states': self.end_states, | |
| } | |
| def deserialize(cls, data, memo): | |
| tokens = data['tokens'] | |
| states = { | |
| state: {tokens[token]: ((Reduce, Rule.deserialize(arg, memo)) if action==1 else (Shift, arg)) | |
| for token, (action, arg) in actions.items()} | |
| for state, actions in data['states'].items() | |
| } | |
| return cls(states, data['start_states'], data['end_states']) | |
| class IntParseTable(ParseTable): | |
| def from_ParseTable(cls, parse_table): | |
| enum = list(parse_table.states) | |
| state_to_idx = {s:i for i,s in enumerate(enum)} | |
| int_states = {} | |
| for s, la in parse_table.states.items(): | |
| la = {k:(v[0], state_to_idx[v[1]]) if v[0] is Shift else v | |
| for k,v in la.items()} | |
| int_states[ state_to_idx[s] ] = la | |
| start_states = {start:state_to_idx[s] for start, s in parse_table.start_states.items()} | |
| end_states = {start:state_to_idx[s] for start, s in parse_table.end_states.items()} | |
| return cls(int_states, start_states, end_states) | |
| def get_frontend(parser, lexer): | |
| if parser=='lalr': | |
| if lexer is None: | |
| raise ValueError('The LALR parser requires use of a lexer') | |
| elif lexer == 'standard': | |
| return LALR_TraditionalLexer | |
| elif lexer == 'contextual': | |
| return LALR_ContextualLexer | |
| elif issubclass(lexer, Lexer): | |
| class LALR_CustomLexerWrapper(LALR_CustomLexer): | |
| def __init__(self, lexer_conf, parser_conf, options=None): | |
| super(LALR_CustomLexerWrapper, self).__init__( | |
| lexer, lexer_conf, parser_conf, options=options) | |
| def init_lexer(self): | |
| self.lexer = lexer(self.lexer_conf) | |
| return LALR_CustomLexerWrapper | |
| else: | |
| raise ValueError('Unknown lexer: %s' % lexer) | |
| elif parser=='earley': | |
| if lexer=='standard': | |
| return Earley | |
| elif lexer=='dynamic': | |
| return XEarley | |
| elif lexer=='dynamic_complete': | |
| return XEarley_CompleteLex | |
| elif lexer=='contextual': | |
| raise ValueError('The Earley parser does not support the contextual parser') | |
| else: | |
| raise ValueError('Unknown lexer: %s' % lexer) | |
| elif parser == 'cyk': | |
| if lexer == 'standard': | |
| return CYK | |
| else: | |
| raise ValueError('CYK parser requires using standard parser.') | |
| else: | |
| raise ValueError('Unknown parser: %s' % parser) | |
| class _ParserFrontend(Serialize): | |
| def _parse(self, input, start, *args): | |
| if start is None: | |
| start = self.start | |
| if len(start) > 1: | |
| raise ValueError("Lark initialized with more than 1 possible start rule. Must specify which start rule to parse", start) | |
| start ,= start | |
| return self.parser.parse(input, start, *args) | |
| def _get_lexer_callbacks(transformer, terminals): | |
| result = {} | |
| for terminal in terminals: | |
| callback = getattr(transformer, terminal.name, None) | |
| if callback is not None: | |
| result[terminal.name] = callback | |
| return result | |
| class WithLexer(_ParserFrontend): | |
| lexer = None | |
| parser = None | |
| lexer_conf = None | |
| start = None | |
| __serialize_fields__ = 'parser', 'lexer_conf', 'start' | |
| __serialize_namespace__ = LexerConf, | |
| def __init__(self, lexer_conf, parser_conf, options=None): | |
| self.lexer_conf = lexer_conf | |
| self.start = parser_conf.start | |
| self.postlex = lexer_conf.postlex | |
| def deserialize(cls, data, memo, callbacks, postlex, transformer, re_module): | |
| inst = super(WithLexer, cls).deserialize(data, memo) | |
| inst.postlex = postlex | |
| inst.parser = LALR_Parser.deserialize(inst.parser, memo, callbacks) | |
| terminals = [item for item in memo.values() if isinstance(item, TerminalDef)] | |
| inst.lexer_conf.callbacks = _get_lexer_callbacks(transformer, terminals) | |
| inst.lexer_conf.re_module = re_module | |
| inst.lexer_conf.skip_validation=True | |
| inst.init_lexer() | |
| return inst | |
| def _serialize(self, data, memo): | |
| data['parser'] = data['parser'].serialize(memo) | |
| def lex(self, *args): | |
| stream = self.lexer.lex(*args) | |
| return self.postlex.process(stream) if self.postlex else stream | |
| def parse(self, text, start=None): | |
| token_stream = self.lex(text) | |
| return self._parse(token_stream, start) | |
| def init_traditional_lexer(self): | |
| self.lexer = TraditionalLexer(self.lexer_conf) | |
| class LALR_WithLexer(WithLexer): | |
| def __init__(self, lexer_conf, parser_conf, options=None): | |
| debug = options.debug if options else False | |
| self.parser = LALR_Parser(parser_conf, debug=debug) | |
| WithLexer.__init__(self, lexer_conf, parser_conf, options) | |
| self.init_lexer() | |
| def init_lexer(self, **kw): | |
| raise NotImplementedError() | |
| class LALR_TraditionalLexer(LALR_WithLexer): | |
| def init_lexer(self): | |
| self.init_traditional_lexer() | |
| class LALR_ContextualLexer(LALR_WithLexer): | |
| def init_lexer(self): | |
| states = {idx:list(t.keys()) for idx, t in self.parser._parse_table.states.items()} | |
| always_accept = self.postlex.always_accept if self.postlex else () | |
| self.lexer = ContextualLexer(self.lexer_conf, states, always_accept=always_accept) | |
| def parse(self, text, start=None): | |
| parser_state = [None] | |
| def set_parser_state(s): | |
| parser_state[0] = s | |
| token_stream = self.lex(text, lambda: parser_state[0]) | |
| return self._parse(token_stream, start, set_parser_state) | |
| class LarkOptions(Serialize): | |
| #-- | |
| OPTIONS_DOC = """ | |
| **=== General ===** | |
| start | |
| The start symbol. Either a string, or a list of strings for multiple possible starts (Default: "start") | |
| debug | |
| Display debug information, such as warnings (default: False) | |
| transformer | |
| Applies the transformer to every parse tree (equivlent to applying it after the parse, but faster) | |
| propagate_positions | |
| Propagates (line, column, end_line, end_column) attributes into all tree branches. | |
| maybe_placeholders | |
| When True, the ``[]`` operator returns ``None`` when not matched. | |
| When ``False``, ``[]`` behaves like the ``?`` operator, and returns no value at all. | |
| (default= ``False``. Recommended to set to ``True``) | |
| regex | |
| When True, uses the ``regex`` module instead of the stdlib ``re``. | |
| cache | |
| Cache the results of the Lark grammar analysis, for x2 to x3 faster loading. LALR only for now. | |
| - When ``False``, does nothing (default) | |
| - When ``True``, caches to a temporary file in the local directory | |
| - When given a string, caches to the path pointed by the string | |
| g_regex_flags | |
| Flags that are applied to all terminals (both regex and strings) | |
| keep_all_tokens | |
| Prevent the tree builder from automagically removing "punctuation" tokens (default: False) | |
| **=== Algorithm ===** | |
| parser | |
| Decides which parser engine to use. Accepts "earley" or "lalr". (Default: "earley"). | |
| (there is also a "cyk" option for legacy) | |
| lexer | |
| Decides whether or not to use a lexer stage | |
| - "auto" (default): Choose for me based on the parser | |
| - "standard": Use a standard lexer | |
| - "contextual": Stronger lexer (only works with parser="lalr") | |
| - "dynamic": Flexible and powerful (only with parser="earley") | |
| - "dynamic_complete": Same as dynamic, but tries *every* variation of tokenizing possible. | |
| ambiguity | |
| Decides how to handle ambiguity in the parse. Only relevant if parser="earley" | |
| - "resolve" - The parser will automatically choose the simplest derivation | |
| (it chooses consistently: greedy for tokens, non-greedy for rules) | |
| - "explicit": The parser will return all derivations wrapped in "_ambig" tree nodes (i.e. a forest). | |
| **=== Misc. / Domain Specific ===** | |
| postlex | |
| Lexer post-processing (Default: None) Only works with the standard and contextual lexers. | |
| priority | |
| How priorities should be evaluated - auto, none, normal, invert (Default: auto) | |
| lexer_callbacks | |
| Dictionary of callbacks for the lexer. May alter tokens during lexing. Use with caution. | |
| use_bytes | |
| Accept an input of type ``bytes`` instead of ``str`` (Python 3 only). | |
| edit_terminals | |
| A callback for editing the terminals before parse. | |
| """ | |
| if __doc__: | |
| __doc__ += OPTIONS_DOC | |
| _defaults = { | |
| 'debug': False, | |
| 'keep_all_tokens': False, | |
| 'tree_class': None, | |
| 'cache': False, | |
| 'postlex': None, | |
| 'parser': 'earley', | |
| 'lexer': 'auto', | |
| 'transformer': None, | |
| 'start': 'start', | |
| 'priority': 'auto', | |
| 'ambiguity': 'auto', | |
| 'regex': False, | |
| 'propagate_positions': False, | |
| 'lexer_callbacks': {}, | |
| 'maybe_placeholders': False, | |
| 'edit_terminals': None, | |
| 'g_regex_flags': 0, | |
| 'use_bytes': False, | |
| } | |
| def __init__(self, options_dict): | |
| o = dict(options_dict) | |
| options = {} | |
| for name, default in self._defaults.items(): | |
| if name in o: | |
| value = o.pop(name) | |
| if isinstance(default, bool) and name not in ('cache', 'use_bytes'): | |
| value = bool(value) | |
| else: | |
| value = default | |
| options[name] = value | |
| if isinstance(options['start'], STRING_TYPE): | |
| options['start'] = [options['start']] | |
| self.__dict__['options'] = options | |
| assert self.parser in ('earley', 'lalr', 'cyk', None) | |
| if self.parser == 'earley' and self.transformer: | |
| raise ValueError('Cannot specify an embedded transformer when using the Earley algorithm.' | |
| 'Please use your transformer on the resulting parse tree, or use a different algorithm (i.e. LALR)') | |
| if o: | |
| raise ValueError("Unknown options: %s" % o.keys()) | |
| def __getattr__(self, name): | |
| try: | |
| return self.options[name] | |
| except KeyError as e: | |
| raise AttributeError(e) | |
| def __setattr__(self, name, value): | |
| assert name in self.options | |
| self.options[name] = value | |
| def serialize(self, memo): | |
| return self.options | |
| def deserialize(cls, data, memo): | |
| return cls(data) | |
| class Lark(Serialize): | |
| #-- | |
| def __init__(self, grammar, **options): | |
| self.options = LarkOptions(options) | |
| ## | |
| use_regex = self.options.regex | |
| if use_regex: | |
| if regex: | |
| re_module = regex | |
| else: | |
| raise ImportError('`regex` module must be installed if calling `Lark(regex=True)`.') | |
| else: | |
| re_module = re | |
| ## | |
| try: | |
| self.source = grammar.name | |
| except AttributeError: | |
| self.source = '<string>' | |
| ## | |
| try: | |
| read = grammar.read | |
| except AttributeError: | |
| pass | |
| else: | |
| grammar = read() | |
| assert isinstance(grammar, STRING_TYPE) | |
| self.grammar_source = grammar | |
| if self.options.use_bytes: | |
| if not isascii(grammar): | |
| raise ValueError("Grammar must be ascii only, when use_bytes=True") | |
| if sys.version_info[0] == 2 and self.options.use_bytes != 'force': | |
| raise NotImplementedError("`use_bytes=True` may have issues on python2." | |
| "Use `use_bytes='force'` to use it at your own risk.") | |
| cache_fn = None | |
| if self.options.cache: | |
| if self.options.parser != 'lalr': | |
| raise NotImplementedError("cache only works with parser='lalr' for now") | |
| if isinstance(self.options.cache, STRING_TYPE): | |
| cache_fn = self.options.cache | |
| else: | |
| if self.options.cache is not True: | |
| raise ValueError("cache argument must be bool or str") | |
| unhashable = ('transformer', 'postlex', 'lexer_callbacks', 'edit_terminals') | |
| from . import __version__ | |
| options_str = ''.join(k+str(v) for k, v in options.items() if k not in unhashable) | |
| s = grammar + options_str + __version__ | |
| md5 = hashlib.md5(s.encode()).hexdigest() | |
| cache_fn = '.lark_cache_%s.tmp' % md5 | |
| if FS.exists(cache_fn): | |
| logger.debug('Loading grammar from cache: %s', cache_fn) | |
| with FS.open(cache_fn, 'rb') as f: | |
| self._load(f, self.options.transformer, self.options.postlex) | |
| return | |
| if self.options.lexer == 'auto': | |
| if self.options.parser == 'lalr': | |
| self.options.lexer = 'contextual' | |
| elif self.options.parser == 'earley': | |
| self.options.lexer = 'dynamic' | |
| elif self.options.parser == 'cyk': | |
| self.options.lexer = 'standard' | |
| else: | |
| assert False, self.options.parser | |
| lexer = self.options.lexer | |
| assert lexer in ('standard', 'contextual', 'dynamic', 'dynamic_complete') or issubclass(lexer, Lexer) | |
| if self.options.ambiguity == 'auto': | |
| if self.options.parser == 'earley': | |
| self.options.ambiguity = 'resolve' | |
| else: | |
| disambig_parsers = ['earley', 'cyk'] | |
| assert self.options.parser in disambig_parsers, ( | |
| 'Only %s supports disambiguation right now') % ', '.join(disambig_parsers) | |
| if self.options.priority == 'auto': | |
| if self.options.parser in ('earley', 'cyk', ): | |
| self.options.priority = 'normal' | |
| elif self.options.parser in ('lalr', ): | |
| self.options.priority = None | |
| elif self.options.priority in ('invert', 'normal'): | |
| assert self.options.parser in ('earley', 'cyk'), "priorities are not supported for LALR at this time" | |
| assert self.options.priority in ('auto', None, 'normal', 'invert'), 'invalid priority option specified: {}. options are auto, none, normal, invert.'.format(self.options.priority) | |
| assert self.options.ambiguity not in ('resolve__antiscore_sum', ), 'resolve__antiscore_sum has been replaced with the option priority="invert"' | |
| assert self.options.ambiguity in ('resolve', 'explicit', 'auto', ) | |
| ## | |
| self.grammar = load_grammar(grammar, self.source, re_module) | |
| ## | |
| self.terminals, self.rules, self.ignore_tokens = self.grammar.compile(self.options.start) | |
| if self.options.edit_terminals: | |
| for t in self.terminals: | |
| self.options.edit_terminals(t) | |
| self._terminals_dict = {t.name: t for t in self.terminals} | |
| ## | |
| ## | |
| if self.options.priority == 'invert': | |
| for rule in self.rules: | |
| if rule.options.priority is not None: | |
| rule.options.priority = -rule.options.priority | |
| ## | |
| ## | |
| ## | |
| elif self.options.priority == None: | |
| for rule in self.rules: | |
| if rule.options.priority is not None: | |
| rule.options.priority = None | |
| ## | |
| lexer_callbacks = (_get_lexer_callbacks(self.options.transformer, self.terminals) | |
| if self.options.transformer | |
| else {}) | |
| lexer_callbacks.update(self.options.lexer_callbacks) | |
| self.lexer_conf = LexerConf(self.terminals, re_module, self.ignore_tokens, self.options.postlex, lexer_callbacks, self.options.g_regex_flags, use_bytes=self.options.use_bytes) | |
| if self.options.parser: | |
| self.parser = self._build_parser() | |
| elif lexer: | |
| self.lexer = self._build_lexer() | |
| if cache_fn: | |
| logger.debug('Saving grammar to cache: %s', cache_fn) | |
| with FS.open(cache_fn, 'wb') as f: | |
| self.save(f) | |
| ## | |
| __doc__ += "\nOptions:\n" + LarkOptions.OPTIONS_DOC | |
| __serialize_fields__ = 'parser', 'rules', 'options' | |
| def _build_lexer(self): | |
| return TraditionalLexer(self.lexer_conf) | |
| def _prepare_callbacks(self): | |
| self.parser_class = get_frontend(self.options.parser, self.options.lexer) | |
| self._parse_tree_builder = ParseTreeBuilder(self.rules, self.options.tree_class or Tree, self.options.propagate_positions, self.options.keep_all_tokens, self.options.parser!='lalr' and self.options.ambiguity=='explicit', self.options.maybe_placeholders) | |
| self._callbacks = self._parse_tree_builder.create_callback(self.options.transformer) | |
| def _build_parser(self): | |
| self._prepare_callbacks() | |
| parser_conf = ParserConf(self.rules, self._callbacks, self.options.start) | |
| return self.parser_class(self.lexer_conf, parser_conf, options=self.options) | |
| def save(self, f): | |
| #-- | |
| data, m = self.memo_serialize([TerminalDef, Rule]) | |
| pickle.dump({'data': data, 'memo': m}, f) | |
| def load(cls, f): | |
| #-- | |
| inst = cls.__new__(cls) | |
| return inst._load(f) | |
| def _load(self, f, transformer=None, postlex=None): | |
| if isinstance(f, dict): | |
| d = f | |
| else: | |
| d = pickle.load(f) | |
| memo = d['memo'] | |
| data = d['data'] | |
| assert memo | |
| memo = SerializeMemoizer.deserialize(memo, {'Rule': Rule, 'TerminalDef': TerminalDef}, {}) | |
| options = dict(data['options']) | |
| if transformer is not None: | |
| options['transformer'] = transformer | |
| if postlex is not None: | |
| options['postlex'] = postlex | |
| self.options = LarkOptions.deserialize(options, memo) | |
| re_module = regex if self.options.regex else re | |
| self.rules = [Rule.deserialize(r, memo) for r in data['rules']] | |
| self.source = '<deserialized>' | |
| self._prepare_callbacks() | |
| self.parser = self.parser_class.deserialize( | |
| data['parser'], | |
| memo, | |
| self._callbacks, | |
| self.options.postlex, | |
| self.options.transformer, | |
| re_module | |
| ) | |
| return self | |
| def _load_from_dict(cls, data, memo, transformer=None, postlex=None): | |
| inst = cls.__new__(cls) | |
| return inst._load({'data': data, 'memo': memo}, transformer, postlex) | |
| def open(cls, grammar_filename, rel_to=None, **options): | |
| #-- | |
| if rel_to: | |
| basepath = os.path.dirname(rel_to) | |
| grammar_filename = os.path.join(basepath, grammar_filename) | |
| with open(grammar_filename, encoding='utf8') as f: | |
| return cls(f, **options) | |
| def __repr__(self): | |
| return 'Lark(open(%r), parser=%r, lexer=%r, ...)' % (self.source, self.options.parser, self.options.lexer) | |
| def lex(self, text): | |
| #-- | |
| if not hasattr(self, 'lexer'): | |
| self.lexer = self._build_lexer() | |
| stream = self.lexer.lex(text) | |
| if self.options.postlex: | |
| return self.options.postlex.process(stream) | |
| return stream | |
| def get_terminal(self, name): | |
| #-- | |
| return self._terminals_dict[name] | |
| def parse(self, text, start=None, on_error=None): | |
| #-- | |
| try: | |
| return self.parser.parse(text, start=start) | |
| except UnexpectedToken as e: | |
| if on_error is None: | |
| raise | |
| while True: | |
| if not on_error(e): | |
| raise e | |
| try: | |
| return e.puppet.resume_parse() | |
| except UnexpectedToken as e2: | |
| e = e2 | |
| DATA = ( | |
| {'parser': {'parser': {'tokens': {0: 'RBRACE', 1: 'COMMA', 2: 'RSQB', 3: '$END', 4: '__object_star_1', 5: 'COLON', 6: 'LBRACE', 7: 'value', 8: 'string', 9: 'object', 10: 'TRUE', 11: 'SIGNED_NUMBER', 12: 'LSQB', 13: 'NULL', 14: 'FALSE', 15: 'array', 16: 'ESCAPED_STRING', 17: '__array_star_0', 18: 'pair', 19: 'start'}, 'states': {0: {0: (1, {'@': 12}), 1: (1, {'@': 12})}, 1: {1: (1, {'@': 13}), 2: (1, {'@': 13}), 0: (1, {'@': 13}), 3: (1, {'@': 13})}, 2: {1: (1, {'@': 14}), 2: (1, {'@': 14}), 0: (1, {'@': 14}), 3: (1, {'@': 14})}, 3: {0: (0, 25), 1: (0, 32)}, 4: {4: (0, 3), 1: (0, 27), 0: (0, 33)}, 5: {0: (1, {'@': 15}), 1: (1, {'@': 15})}, 6: {}, 7: {1: (0, 23), 2: (0, 2)}, 8: {1: (1, {'@': 16}), 2: (1, {'@': 16})}, 9: {1: (1, {'@': 17}), 2: (1, {'@': 17}), 5: (1, {'@': 17}), 0: (1, {'@': 17}), 3: (1, {'@': 17})}, 10: {1: (1, {'@': 18}), 2: (1, {'@': 18}), 0: (1, {'@': 18}), 3: (1, {'@': 18})}, 11: {1: (1, {'@': 19}), 2: (1, {'@': 19}), 0: (1, {'@': 19}), 3: (1, {'@': 19})}, 12: {1: (1, {'@': 20}), 2: (1, {'@': 20}), 0: (1, {'@': 20}), 3: (1, {'@': 20})}, 13: {5: (0, 22)}, 14: {6: (0, 21), 7: (0, 29), 8: (0, 12), 9: (0, 1), 10: (0, 16), 11: (0, 11), 12: (0, 26), 13: (0, 30), 14: (0, 15), 15: (0, 10), 16: (0, 9)}, 15: {1: (1, {'@': 21}), 2: (1, {'@': 21}), 0: (1, {'@': 21}), 3: (1, {'@': 21})}, 16: {1: (1, {'@': 22}), 2: (1, {'@': 22}), 0: (1, {'@': 22}), 3: (1, {'@': 22})}, 17: {1: (1, {'@': 23}), 2: (1, {'@': 23}), 0: (1, {'@': 23}), 3: (1, {'@': 23})}, 18: {2: (0, 24), 1: (0, 14), 17: (0, 7)}, 19: {1: (1, {'@': 24}), 2: (1, {'@': 24}), 0: (1, {'@': 24}), 3: (1, {'@': 24})}, 20: {0: (1, {'@': 25}), 1: (1, {'@': 25})}, 21: {8: (0, 13), 18: (0, 4), 16: (0, 9), 0: (0, 19)}, 22: {6: (0, 21), 8: (0, 12), 9: (0, 1), 10: (0, 16), 11: (0, 11), 12: (0, 26), 13: (0, 30), 14: (0, 15), 15: (0, 10), 7: (0, 20), 16: (0, 9)}, 23: {6: (0, 21), 7: (0, 8), 9: (0, 1), 8: (0, 12), 10: (0, 16), 11: (0, 11), 12: (0, 26), 13: (0, 30), 14: (0, 15), 15: (0, 10), 16: (0, 9)}, 24: {1: (1, {'@': 26}), 2: (1, {'@': 26}), 0: (1, {'@': 26}), 3: (1, {'@': 26})}, 25: {1: (1, {'@': 27}), 2: (1, {'@': 27}), 0: (1, {'@': 27}), 3: (1, {'@': 27})}, 26: {6: (0, 21), 10: (0, 16), 12: (0, 26), 13: (0, 30), 14: (0, 15), 7: (0, 18), 8: (0, 12), 16: (0, 9), 9: (0, 1), 11: (0, 11), 15: (0, 10), 2: (0, 17)}, 27: {8: (0, 13), 18: (0, 0), 16: (0, 9)}, 28: {6: (0, 21), 10: (0, 16), 12: (0, 26), 13: (0, 30), 8: (0, 12), 16: (0, 9), 19: (0, 6), 9: (0, 1), 11: (0, 11), 7: (0, 31), 15: (0, 10), 14: (0, 15)}, 29: {1: (1, {'@': 28}), 2: (1, {'@': 28})}, 30: {1: (1, {'@': 29}), 2: (1, {'@': 29}), 0: (1, {'@': 29}), 3: (1, {'@': 29})}, 31: {3: (1, {'@': 30})}, 32: {18: (0, 5), 8: (0, 13), 16: (0, 9)}, 33: {1: (1, {'@': 31}), 2: (1, {'@': 31}), 0: (1, {'@': 31}), 3: (1, {'@': 31})}}, 'start_states': {'start': 28}, 'end_states': {'start': 6}}, 'lexer_conf': {'tokens': [{'@': 0}, {'@': 1}, {'@': 2}, {'@': 3}, {'@': 4}, {'@': 5}, {'@': 6}, {'@': 7}, {'@': 8}, {'@': 9}, {'@': 10}, {'@': 11}], 'ignore': ['WS'], 'g_regex_flags': 0, 'use_bytes': False, '__type__': 'LexerConf'}, 'start': ['start'], '__type__': 'LALR_ContextualLexer'}, 'rules': [{'@': 30}, {'@': 13}, {'@': 18}, {'@': 20}, {'@': 19}, {'@': 22}, {'@': 21}, {'@': 29}, {'@': 14}, {'@': 26}, {'@': 23}, {'@': 27}, {'@': 31}, {'@': 24}, {'@': 25}, {'@': 17}, {'@': 28}, {'@': 16}, {'@': 12}, {'@': 15}], 'options': {'debug': False, 'keep_all_tokens': False, 'tree_class': None, 'cache': False, 'postlex': None, 'parser': 'lalr', 'lexer': 'contextual', 'transformer': None, 'start': ['start'], 'priority': None, 'ambiguity': 'auto', 'regex': False, 'propagate_positions': False, 'lexer_callbacks': {}, 'maybe_placeholders': False, 'edit_terminals': None, 'g_regex_flags': 0, 'use_bytes': False}, '__type__': 'Lark'} | |
| ) | |
| MEMO = ( | |
| {0: {'name': 'ESCAPED_STRING', 'pattern': {'value': '\\".*?(?<!\\\\)(\\\\\\\\)*?\\"', 'flags': [], '_width': [2, 4294967295], '__type__': 'PatternRE'}, 'priority': 1, '__type__': 'TerminalDef'}, 1: {'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': 1, '__type__': 'TerminalDef'}, 2: {'name': 'WS', 'pattern': {'value': '(?:[ \t\x0c\r\n])+', 'flags': [], '_width': [1, 4294967295], '__type__': 'PatternRE'}, 'priority': 1, '__type__': 'TerminalDef'}, 3: {'name': 'TRUE', 'pattern': {'value': 'true', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 4: {'name': 'FALSE', 'pattern': {'value': 'false', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 5: {'name': 'NULL', 'pattern': {'value': 'null', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 6: {'name': 'COMMA', 'pattern': {'value': ',', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 7: {'name': 'LSQB', 'pattern': {'value': '[', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 8: {'name': 'RSQB', 'pattern': {'value': ']', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 9: {'name': 'LBRACE', 'pattern': {'value': '{', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 10: {'name': 'RBRACE', 'pattern': {'value': '}', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 11: {'name': 'COLON', 'pattern': {'value': ':', 'flags': [], '__type__': 'PatternStr'}, 'priority': 1, '__type__': 'TerminalDef'}, 12: {'origin': {'name': '__object_star_1', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'COMMA', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'pair', '__type__': 'NonTerminal'}], 'order': 0, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 13: {'origin': {'name': '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': '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'}, 15: {'origin': {'name': '__object_star_1', '__type__': 'NonTerminal'}, 'expansion': [{'name': '__object_star_1', '__type__': 'NonTerminal'}, {'name': 'COMMA', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'pair', '__type__': 'NonTerminal'}], 'order': 1, 'alias': None, 'options': {'keep_all_tokens': False, 'expand1': False, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 16: {'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'}, 17: {'origin': {'name': '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'}, 18: {'origin': {'name': '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'}, 19: {'origin': {'name': 'value', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'SIGNED_NUMBER', 'filter_out': False, '__type__': 'Terminal'}], 'order': 3, 'alias': 'number', 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 20: {'origin': {'name': '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'}, 21: {'origin': {'name': 'value', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'FALSE', 'filter_out': True, '__type__': 'Terminal'}], 'order': 5, 'alias': 'false', 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 22: {'origin': {'name': 'value', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'TRUE', 'filter_out': True, '__type__': 'Terminal'}], 'order': 4, 'alias': 'true', 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 23: {'origin': {'name': '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'}, 24: {'origin': {'name': 'object', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'LBRACE', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'RBRACE', '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'}, 25: {'origin': {'name': 'pair', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'string', '__type__': 'NonTerminal'}, {'name': 'COLON', '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'}, 26: {'origin': {'name': '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'}, 27: {'origin': {'name': 'object', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'LBRACE', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'pair', '__type__': 'NonTerminal'}, {'name': '__object_star_1', '__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'}, 28: {'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'}, 29: {'origin': {'name': 'value', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'NULL', 'filter_out': True, '__type__': 'Terminal'}], 'order': 6, 'alias': 'null', 'options': {'keep_all_tokens': False, 'expand1': True, 'priority': None, 'template_source': None, 'empty_indices': (), '__type__': 'RuleOptions'}, '__type__': 'Rule'}, 30: {'origin': {'name': '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'}, 31: {'origin': {'name': 'object', '__type__': 'NonTerminal'}, 'expansion': [{'name': 'LBRACE', 'filter_out': True, '__type__': 'Terminal'}, {'name': 'pair', '__type__': 'NonTerminal'}, {'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'}} | |
| ) | |
| Shift = 0 | |
| Reduce = 1 | |
| def Lark_StandAlone(transformer=None, postlex=None): | |
| return Lark._load_from_dict(DATA, MEMO, transformer=transformer, postlex=postlex) | |