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Name	Size	Permission	Date
atn	[ DIR ]	drwxr-xr-x	2026-05-04 18:19
dfa	[ DIR ]	drwxr-xr-x	2026-05-04 18:19
error	[ DIR ]	drwxr-xr-x	2026-05-04 18:19
tree	[ DIR ]	drwxr-xr-x	2026-05-04 18:19
xpath	[ DIR ]	drwxr-xr-x	2026-05-04 18:19
BufferedTokenStream.py	10.53 KB	-rw-r--r--	2026-03-24 06:27
CommonTokenFactory.py	2.06 KB	-rw-r--r--	2026-03-24 06:27
CommonTokenStream.py	2.71 KB	-rw-r--r--	2026-03-24 06:27
FileStream.py	868 B	-rw-r--r--	2026-03-24 06:27
InputStream.py	2.28 KB	-rw-r--r--	2026-03-24 06:27
IntervalSet.py	5.83 KB	-rw-r--r--	2026-03-24 06:27
LL1Analyzer.py	7.57 KB	-rw-r--r--	2026-03-24 06:27
Lexer.py	11.27 KB	-rw-r--r--	2026-03-24 06:27
ListTokenSource.py	5.23 KB	-rw-r--r--	2026-03-24 06:27
Parser.py	22.35 KB	-rw-r--r--	2026-03-24 06:27
ParserInterpreter.py	7.04 KB	-rw-r--r--	2026-03-24 06:27
ParserRuleContext.py	6.6 KB	-rw-r--r--	2026-03-24 06:27
PredictionContext.py	22.94 KB	-rw-r--r--	2026-03-24 06:27
Recognizer.py	5.26 KB	-rw-r--r--	2026-03-24 06:27
RuleContext.py	7.91 KB	-rw-r--r--	2026-03-24 06:27
StdinStream.py	303 B	-rw-r--r--	2026-03-24 06:27
Token.py	5.08 KB	-rw-r--r--	2026-03-24 06:27
TokenStreamRewriter.py	10.08 KB	-rw-r--r--	2026-03-24 06:27
Utils.py	931 B	-rw-r--r--	2026-03-24 06:27
__init__.py	1.1 KB	-rw-r--r--	2026-03-24 06:27
_pygrun.py	6.14 KB	-rw-r--r--	2026-03-24 06:27

Rename

#
# Copyright (c) 2012-2017 The ANTLR Project. All rights reserved.
# Use of this file is governed by the BSD 3-clause license that
# can be found in the LICENSE.txt file in the project root.
#/

#
# This class extends {@link BufferedTokenStream} with functionality to filter
# token streams to tokens on a particular channel (tokens where
# {@link Token#getChannel} returns a particular value).
#
# 
# This token stream provides access to all tokens by index or when calling
# methods like {@link #getText}. The channel filtering is only used for code
# accessing tokens via the lookahead methods {@link #LA}, {@link #LT}, and
# {@link #LB}.
#
# 
# By default, tokens are placed on the default channel
# ({@link Token#DEFAULT_CHANNEL}), but may be reassigned by using the
# {@code ->channel(HIDDEN)} lexer command, or by using an embedded action to
# call {@link Lexer#setChannel}.
# 
#
# 
# Note: lexer rules which use the {@code ->skip} lexer command or call
# {@link Lexer#skip} do not produce tokens at all, so input text matched by
# such a rule will not be available as part of the token stream, regardless of
# channel.
#/

from antlr4.BufferedTokenStream import BufferedTokenStream
from antlr4.Lexer import Lexer
from antlr4.Token import Token

class CommonTokenStream(BufferedTokenStream):
    __slots__ = 'channel'

def __init__(self, lexer:Lexer, channel:int=Token.DEFAULT_CHANNEL):
        super().__init__(lexer)
        self.channel = channel

def adjustSeekIndex(self, i:int):
        return self.nextTokenOnChannel(i, self.channel)

def LB(self, k:int):
 if k==0 or (self.index-k)<0:
 return None
 i = self.index
 n = 1
 # find k good tokens looking backwards
 while n <= k:
 # skip off-channel tokens
 i = self.previousTokenOnChannel(i - 1, self.channel)
 n += 1
 if i < 0:
 return None
 return self.tokens[i]

def LT(self, k:int):
 self.lazyInit()
 if k == 0:
 return None
 if k < 0:
 return self.LB(-k)
 i = self.index
 n = 1 # we know tokens[pos] is a good one
 # find k good tokens
 while n < k:
 # skip off-channel tokens, but make sure to not look past EOF
 if self.sync(i + 1):
 i = self.nextTokenOnChannel(i + 1, self.channel)
 n += 1
 return self.tokens[i]

# Count EOF just once.#/
    def getNumberOfOnChannelTokens(self):
        n = 0
        self.fill()
        for i in range(0, len(self.tokens)):
            t = self.tokens[i]
            if t.channel==self.channel:
                n += 1
            if t.type==Token.EOF:
                break
        return n