two version of R2R are here HEAD master

1 files changed, 132 insertions, 0 deletions

diff --git a/.venv/lib/python3.12/site-packages/lark/parsers/lalr_interactive_parser.py b/.venv/lib/python3.12/site-packages/lark/parsers/lalr_interactive_parser.py
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+++ b/.venv/lib/python3.12/site-packages/lark/parsers/lalr_interactive_parser.py
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+# This module provides a LALR interactive parser, which is used for debugging and error handling
+
+from copy import copy
+
+from .. import Token
+from ..exceptions import UnexpectedToken
+
+
+class InteractiveParser(object):
+    """InteractiveParser gives you advanced control over parsing and error handling when parsing with LALR.
+
+    For a simpler interface, see the ``on_error`` argument to ``Lark.parse()``.
+    """
+    def __init__(self, parser, parser_state, lexer_state):
+        self.parser = parser
+        self.parser_state = parser_state
+        self.lexer_state = lexer_state
+
+    def feed_token(self, token):
+        """Feed the parser with a token, and advance it to the next state, as if it received it from the lexer.
+
+        Note that ``token`` has to be an instance of ``Token``.
+        """
+        return self.parser_state.feed_token(token, token.type == '$END')
+    
+    def exhaust_lexer(self):
+        """Try to feed the rest of the lexer state into the interactive parser.
+        
+        Note that this modifies the instance in place and does not feed an '$END' Token"""
+        for token in self.lexer_state.lex(self.parser_state):
+            self.parser_state.feed_token(token)
+    
+    def feed_eof(self, last_token=None):
+        """Feed a '$END' Token. Borrows from 'last_token' if given."""
+        eof = Token.new_borrow_pos('$END', '', last_token) if last_token is not None else Token('$END', '', 0, 1, 1)
+        return self.feed_token(eof)
+
+
+    def __copy__(self):
+        """Create a new interactive parser with a separate state.
+
+        Calls to feed_token() won't affect the old instance, and vice-versa.
+        """
+        return type(self)(
+            self.parser,
+            copy(self.parser_state),
+            copy(self.lexer_state),
+        )
+
+    def copy(self):
+        return copy(self)
+
+    def __eq__(self, other):
+        if not isinstance(other, InteractiveParser):
+            return False
+
+        return self.parser_state == other.parser_state and self.lexer_state == other.lexer_state
+
+    def as_immutable(self):
+        """Convert to an ``ImmutableInteractiveParser``."""
+        p = copy(self)
+        return ImmutableInteractiveParser(p.parser, p.parser_state, p.lexer_state)
+
+    def pretty(self):
+        """Print the output of ``choices()`` in a way that's easier to read."""
+        out = ["Parser choices:"]
+        for k, v in self.choices().items():
+            out.append('\t- %s -> %r' % (k, v))
+        out.append('stack size: %s' % len(self.parser_state.state_stack))
+        return '\n'.join(out)
+
+    def choices(self):
+        """Returns a dictionary of token types, matched to their action in the parser.
+
+        Only returns token types that are accepted by the current state.
+
+        Updated by ``feed_token()``.
+        """
+        return self.parser_state.parse_conf.parse_table.states[self.parser_state.position]
+
+    def accepts(self):
+        """Returns the set of possible tokens that will advance the parser into a new valid state."""
+        accepts = set()
+        for t in self.choices():
+            if t.isupper(): # is terminal?
+                new_cursor = copy(self)
+                try:
+                    new_cursor.feed_token(Token(t, ''))
+                except UnexpectedToken:
+                    pass
+                else:
+                    accepts.add(t)
+        return accepts
+
+    def resume_parse(self):
+        """Resume automated parsing from the current state."""
+        return self.parser.parse_from_state(self.parser_state)
+
+
+
+class ImmutableInteractiveParser(InteractiveParser):
+    """Same as ``InteractiveParser``, but operations create a new instance instead
+    of changing it in-place.
+    """
+
+    result = None
+
+    def __hash__(self):
+        return hash((self.parser_state, self.lexer_state))
+
+    def feed_token(self, token):
+        c = copy(self)
+        c.result = InteractiveParser.feed_token(c, token)
+        return c
+
+    def exhaust_lexer(self):
+        """Try to feed the rest of the lexer state into the parser.
+
+        Note that this returns a new ImmutableInteractiveParser and does not feed an '$END' Token"""
+        cursor = self.as_mutable()
+        cursor.exhaust_lexer()
+        return cursor.as_immutable()
+
+    def as_mutable(self):
+        """Convert to an ``InteractiveParser``."""
+        p = copy(self)
+        return InteractiveParser(p.parser, p.parser_state, p.lexer_state)
+
+
+# Deprecated class names for the interactive parser
+ParserPuppet = InteractiveParser
+ImmutableParserPuppet = ImmutableInteractiveParser