two version of R2R are hereHEADmaster

1 files changed, 267 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/lark/exceptions.py b/.venv/lib/python3.12/site-packages/lark/exceptions.py
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+++ b/.venv/lib/python3.12/site-packages/lark/exceptions.py
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+from warnings import warn
+
+from .utils import STRING_TYPE, logger, NO_VALUE
+
+
+###{standalone
+
+
+class LarkError(Exception):
+    pass
+
+
+class ConfigurationError(LarkError, ValueError):
+    pass
+
+
+def assert_config(value, options, msg='Got %r, expected one of %s'):
+    if value not in options:
+        raise ConfigurationError(msg % (value, options))
+
+
+class GrammarError(LarkError):
+    pass
+
+
+class ParseError(LarkError):
+    pass
+
+
+class LexError(LarkError):
+    pass
+
+
+class UnexpectedInput(LarkError):
+    """UnexpectedInput Error.
+
+    Used as a base class for the following exceptions:
+
+    - ``UnexpectedCharacters``: The lexer encountered an unexpected string
+    - ``UnexpectedToken``: The parser received an unexpected token
+    - ``UnexpectedEOF``: The parser expected a token, but the input ended
+
+    After catching one of these exceptions, you may call the following helper methods to create a nicer error message.
+    """
+    pos_in_stream = None
+    _terminals_by_name = None
+
+    def get_context(self, text, span=40):
+        """Returns a pretty string pinpointing the error in the text,
+        with span amount of context characters around it.
+
+        Note:
+            The parser doesn't hold a copy of the text it has to parse,
+            so you have to provide it again
+        """
+        assert self.pos_in_stream is not None, self
+        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.expandtabs()) + '^\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.expandtabs()) + b'^\n').decode("ascii", "backslashreplace")
+
+    def match_examples(self, parse_fn, examples, token_type_match_fallback=False, use_accepts=False):
+        """Allows you to detect what's wrong in the input text by matching
+        against example errors.
+
+        Given a parser instance and a dictionary mapping some label with
+        some malformed syntax examples, it'll return the label for the
+        example that bests matches the current error. The function will
+        iterate the dictionary until it finds a matching error, and
+        return the corresponding value.
+
+        For an example usage, see `examples/error_reporting_lalr.py`
+
+        Parameters:
+            parse_fn: parse function (usually ``lark_instance.parse``)
+            examples: dictionary of ``{'example_string': value}``.
+            use_accepts: Recommended to call this with ``use_accepts=True``.
+                The default is ``False`` for backwards compatibility.
+        """
+        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 hasattr(self, '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:  # Try exact match first
+                                logger.debug("Exact Match at example [%s][%s]" % (i, j))
+                                return label
+
+                            if token_type_match_fallback:
+                                # Fallback to token types match
+                                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 candidate[0] is None:
+                            logger.debug("Same State match at example [%s][%s]" % (i, j))
+                            candidate = label, False
+
+        return candidate[0]
+
+    def _format_expected(self, expected):
+        if self._terminals_by_name:
+            d = self._terminals_by_name
+            expected = [d[t_name].user_repr() if t_name in d else t_name for t_name in expected]
+        return "Expected one of: \n\t* %s\n" % '\n\t* '.join(expected)
+
+
+class UnexpectedEOF(ParseError, UnexpectedInput):
+    """An exception that is raised by the parser, when the input ends while it still expects a token.
+    """
+
+    def __init__(self, expected, state=None, terminals_by_name=None):
+        super(UnexpectedEOF, self).__init__()
+
+        self.expected = expected
+        self.state = state
+        from .lexer import Token
+        self.token = Token("<EOF>", "")  # , line=-1, column=-1, pos_in_stream=-1)
+        self.pos_in_stream = -1
+        self.line = -1
+        self.column = -1
+        self._terminals_by_name = terminals_by_name
+
+
+    def __str__(self):
+        message = "Unexpected end-of-input. "
+        message += self._format_expected(self.expected)
+        return message
+
+
+class UnexpectedCharacters(LexError, UnexpectedInput):
+    """An exception that is raised by the lexer, when it cannot match the next 
+    string of characters to any of its terminals.
+    """
+
+    def __init__(self, seq, lex_pos, line, column, allowed=None, considered_tokens=None, state=None, token_history=None,
+                 terminals_by_name=None, considered_rules=None):
+        super(UnexpectedCharacters, self).__init__()
+
+        # TODO considered_tokens and allowed can be figured out using state
+        self.line = line
+        self.column = column
+        self.pos_in_stream = lex_pos
+        self.state = state
+        self._terminals_by_name = terminals_by_name
+
+        self.allowed = allowed
+        self.considered_tokens = considered_tokens
+        self.considered_rules = considered_rules
+        self.token_history = token_history
+
+        if isinstance(seq, bytes):
+            self.char = seq[lex_pos:lex_pos + 1].decode("ascii", "backslashreplace")
+        else:
+            self.char = seq[lex_pos]
+        self._context = self.get_context(seq)
+
+
+    def __str__(self):
+        message = "No terminal matches '%s' in the current parser context, at line %d col %d" % (self.char, self.line, self.column)
+        message += '\n\n' + self._context
+        if self.allowed:
+            message += self._format_expected(self.allowed)
+        if self.token_history:
+            message += '\nPrevious tokens: %s\n' % ', '.join(repr(t) for t in self.token_history)
+        return message
+
+
+class UnexpectedToken(ParseError, UnexpectedInput):
+    """An exception that is raised by the parser, when the token it received
+    doesn't match any valid step forward.
+
+    Parameters:
+        token: The mismatched token
+        expected: The set of expected tokens
+        considered_rules: Which rules were considered, to deduce the expected tokens
+        state: A value representing the parser state. Do not rely on its value or type.
+        interactive_parser: An instance of ``InteractiveParser``, that is initialized to the point of failture,
+                            and can be used for debugging and error handling.
+
+    Note: These parameters are available as attributes of the instance.
+    """
+
+    def __init__(self, token, expected, considered_rules=None, state=None, interactive_parser=None, terminals_by_name=None, token_history=None):
+        super(UnexpectedToken, self).__init__()
+        
+        # TODO considered_rules and expected can be figured out using state
+        self.line = getattr(token, 'line', '?')
+        self.column = getattr(token, 'column', '?')
+        self.pos_in_stream = getattr(token, 'start_pos', None)
+        self.state = state
+
+        self.token = token
+        self.expected = expected  # XXX deprecate? `accepts` is better
+        self._accepts = NO_VALUE
+        self.considered_rules = considered_rules
+        self.interactive_parser = interactive_parser
+        self._terminals_by_name = terminals_by_name
+        self.token_history = token_history
+
+
+    @property
+    def accepts(self):
+        if self._accepts is NO_VALUE:
+            self._accepts = self.interactive_parser and self.interactive_parser.accepts()
+        return self._accepts
+
+    def __str__(self):
+        message = ("Unexpected token %r at line %s, column %s.\n%s"
+                   % (self.token, self.line, self.column, self._format_expected(self.accepts or self.expected)))
+        if self.token_history:
+            message += "Previous tokens: %r\n" % self.token_history
+
+        return message
+
+    @property
+    def puppet(self):
+        warn("UnexpectedToken.puppet attribute has been renamed to interactive_parser", DeprecationWarning)
+        return self.interactive_parser
+    
+
+
+class VisitError(LarkError):
+    """VisitError is raised when visitors are interrupted by an exception
+
+    It provides the following attributes for inspection:
+
+    Parameters:
+        rule: the name of the visit rule that failed
+        obj: the tree-node or token that was being processed
+        orig_exc: the exception that cause it to fail
+
+    Note: These parameters are available as attributes
+    """
+
+    def __init__(self, rule, obj, orig_exc):
+        message = 'Error trying to process rule "%s":\n\n%s' % (rule, orig_exc)
+        super(VisitError, self).__init__(message)
+
+        self.rule = rule
+        self.obj = obj
+        self.orig_exc = orig_exc
+
+###}