1 files changed, 239 insertions, 0 deletions
diff --git a/.venv/lib/python3.12/site-packages/lark/parser_frontends.py b/.venv/lib/python3.12/site-packages/lark/parser_frontends.py
new file mode 100644
index 00000000..0e53dd58
--- /dev/null
+++ b/.venv/lib/python3.12/site-packages/lark/parser_frontends.py
@@ -0,0 +1,239 @@
+from .exceptions import ConfigurationError, GrammarError, assert_config
+from .utils import get_regexp_width, Serialize
+from .parsers.grammar_analysis import GrammarAnalyzer
+from .lexer import LexerThread, TraditionalLexer, ContextualLexer, Lexer, Token, TerminalDef
+from .parsers import earley, xearley, cyk
+from .parsers.lalr_parser import LALR_Parser
+from .tree import Tree
+from .common import LexerConf, ParserConf
+try:
+    import regex
+except ImportError:
+    regex = None
+import re
+
+###{standalone
+
+def _wrap_lexer(lexer_class):
+    future_interface = getattr(lexer_class, '__future_interface__', False)
+    if future_interface:
+        return lexer_class
+    else:
+        class CustomLexerWrapper(Lexer):
+            def __init__(self, lexer_conf):
+                self.lexer = lexer_class(lexer_conf)
+            def lex(self, lexer_state, parser_state):
+                return self.lexer.lex(lexer_state.text)
+        return CustomLexerWrapper
+
+
+class MakeParsingFrontend:
+    def __init__(self, parser_type, lexer_type):
+        self.parser_type = parser_type
+        self.lexer_type = lexer_type
+
+    def __call__(self, lexer_conf, parser_conf, options):
+        assert isinstance(lexer_conf, LexerConf)
+        assert isinstance(parser_conf, ParserConf)
+        parser_conf.parser_type = self.parser_type
+        lexer_conf.lexer_type = self.lexer_type
+        return ParsingFrontend(lexer_conf, parser_conf, options)
+
+    def deserialize(self, data, memo, lexer_conf, callbacks, options):
+        parser_conf = ParserConf.deserialize(data['parser_conf'], memo)
+        parser = LALR_Parser.deserialize(data['parser'], memo, callbacks, options.debug)
+        parser_conf.callbacks = callbacks
+        return ParsingFrontend(lexer_conf, parser_conf, options, parser=parser)
+
+
+
+
+class ParsingFrontend(Serialize):
+    __serialize_fields__ = 'lexer_conf', 'parser_conf', 'parser', 'options'
+
+    def __init__(self, lexer_conf, parser_conf, options, parser=None):
+        self.parser_conf = parser_conf
+        self.lexer_conf = lexer_conf
+        self.options = options
+
+        # Set-up parser
+        if parser:  # From cache
+            self.parser = parser
+        else:
+            create_parser = {
+                'lalr': create_lalr_parser,
+                'earley': create_earley_parser,
+                'cyk': CYK_FrontEnd,
+            }[parser_conf.parser_type]
+            self.parser = create_parser(lexer_conf, parser_conf, options)
+
+        # Set-up lexer
+        lexer_type = lexer_conf.lexer_type
+        self.skip_lexer = False
+        if lexer_type in ('dynamic', 'dynamic_complete'):
+            assert lexer_conf.postlex is None
+            self.skip_lexer = True
+            return
+
+        try:
+            create_lexer = {
+                'standard': create_traditional_lexer,
+                'contextual': create_contextual_lexer,
+            }[lexer_type]
+        except KeyError:
+            assert issubclass(lexer_type, Lexer), lexer_type
+            self.lexer = _wrap_lexer(lexer_type)(lexer_conf)
+        else:
+            self.lexer = create_lexer(lexer_conf, self.parser, lexer_conf.postlex)
+
+        if lexer_conf.postlex:
+            self.lexer = PostLexConnector(self.lexer, lexer_conf.postlex)
+    
+    def _verify_start(self, start=None):
+        if start is None:
+            start_decls = self.parser_conf.start
+            if len(start_decls) > 1:
+                raise ConfigurationError("Lark initialized with more than 1 possible start rule. Must specify which start rule to parse", start_decls)
+            start ,= start_decls
+        elif start not in self.parser_conf.start:
+            raise ConfigurationError("Unknown start rule %s. Must be one of %r" % (start, self.parser_conf.start))
+        return start
+
+    def parse(self, text, start=None, on_error=None):
+        chosen_start = self._verify_start(start)
+        stream = text if self.skip_lexer else LexerThread(self.lexer, text)
+        kw = {} if on_error is None else {'on_error': on_error}
+        return self.parser.parse(stream, chosen_start, **kw)
+    
+    def parse_interactive(self, text=None, start=None):
+        chosen_start = self._verify_start(start)
+        if self.parser_conf.parser_type != 'lalr':
+            raise ConfigurationError("parse_interactive() currently only works with parser='lalr' ")
+        stream = text if self.skip_lexer else LexerThread(self.lexer, text)
+        return self.parser.parse_interactive(stream, chosen_start)
+
+
+def get_frontend(parser, lexer):
+    assert_config(parser, ('lalr', 'earley', 'cyk'))
+    if not isinstance(lexer, type):     # not custom lexer?
+        expected = {
+            'lalr': ('standard', 'contextual'),
+            'earley': ('standard', 'dynamic', 'dynamic_complete'),
+            'cyk': ('standard', ),
+         }[parser]
+        assert_config(lexer, expected, 'Parser %r does not support lexer %%r, expected one of %%s' % parser)
+
+    return MakeParsingFrontend(parser, lexer)
+
+
+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 PostLexConnector:
+    def __init__(self, lexer, postlexer):
+        self.lexer = lexer
+        self.postlexer = postlexer
+
+    def make_lexer_state(self, text):
+        return self.lexer.make_lexer_state(text)
+
+    def lex(self, lexer_state, parser_state):
+        i = self.lexer.lex(lexer_state, parser_state)
+        return self.postlexer.process(i)
+
+
+
+def create_traditional_lexer(lexer_conf, parser, postlex):
+    return TraditionalLexer(lexer_conf)
+
+def create_contextual_lexer(lexer_conf, parser, postlex):
+    states = {idx:list(t.keys()) for idx, t in parser._parse_table.states.items()}
+    always_accept = postlex.always_accept if postlex else ()
+    return ContextualLexer(lexer_conf, states, always_accept=always_accept)
+
+def create_lalr_parser(lexer_conf, parser_conf, options=None):
+    debug = options.debug if options else False
+    return LALR_Parser(parser_conf, debug=debug)
+
+
+create_earley_parser = NotImplemented
+CYK_FrontEnd = NotImplemented
+###}
+
+class EarleyRegexpMatcher:
+    def __init__(self, lexer_conf):
+        self.regexps = {}
+        for t in lexer_conf.terminals:
+            if t.priority != 1:
+                raise GrammarError("Dynamic Earley doesn't support weights on terminals", t, t.priority)
+            regexp = t.pattern.to_regexp()
+            try:
+                width = get_regexp_width(regexp)[0]
+            except ValueError:
+                raise GrammarError("Bad regexp in token %s: %s" % (t.name, regexp))
+            else:
+                if width == 0:
+                    raise GrammarError("Dynamic Earley doesn't allow zero-width regexps", t)
+            if lexer_conf.use_bytes:
+                regexp = regexp.encode('utf-8')
+
+            self.regexps[t.name] = lexer_conf.re_module.compile(regexp, lexer_conf.g_regex_flags)
+
+    def match(self, term, text, index=0):
+        return self.regexps[term.name].match(text, index)
+
+
+def create_earley_parser__dynamic(lexer_conf, parser_conf, options=None, **kw):
+        earley_matcher = EarleyRegexpMatcher(lexer_conf)
+        return xearley.Parser(parser_conf, earley_matcher.match, ignore=lexer_conf.ignore, **kw)
+
+def _match_earley_basic(term, token):
+    return term.name == token.type
+
+def create_earley_parser__basic(lexer_conf, parser_conf, options, **kw):
+    return earley.Parser(parser_conf, _match_earley_basic, **kw)
+
+def create_earley_parser(lexer_conf, parser_conf, options):
+    resolve_ambiguity = options.ambiguity == 'resolve'
+    debug = options.debug if options else False
+    tree_class = options.tree_class or Tree if options.ambiguity != 'forest' else None
+
+    extra = {}
+    if lexer_conf.lexer_type == 'dynamic':
+        f = create_earley_parser__dynamic
+    elif lexer_conf.lexer_type == 'dynamic_complete':
+        extra['complete_lex'] =True
+        f = create_earley_parser__dynamic
+    else:
+        f = create_earley_parser__basic
+
+    return f(lexer_conf, parser_conf, options, resolve_ambiguity=resolve_ambiguity, debug=debug, tree_class=tree_class, **extra)
+
+
+
+class CYK_FrontEnd:
+    def __init__(self, lexer_conf, parser_conf, options=None):
+        self._analysis = GrammarAnalyzer(parser_conf)
+        self.parser = cyk.Parser(parser_conf.rules)
+
+        self.callbacks = parser_conf.callbacks
+
+    def parse(self, lexer_thread, start):
+        tokens = list(lexer_thread.lex(None))
+        tree = self.parser.parse(tokens, start)
+        return self._transform(tree)
+
+    def _transform(self, tree):
+        subtrees = list(tree.iter_subtrees())
+        for subtree in subtrees:
+            subtree.children = [self._apply_callback(c) if isinstance(c, Tree) else c for c in subtree.children]
+
+        return self._apply_callback(tree)
+
+    def _apply_callback(self, tree):
+        return self.callbacks[tree.rule](tree.children)