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#
# 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.
#
from enum import IntEnum
# need forward declaration
Lexer = None
class LexerActionType(IntEnum):
CHANNEL = 0 #The type of a {@link LexerChannelAction} action.
CUSTOM = 1 #The type of a {@link LexerCustomAction} action.
MODE = 2 #The type of a {@link LexerModeAction} action.
MORE = 3 #The type of a {@link LexerMoreAction} action.
POP_MODE = 4 #The type of a {@link LexerPopModeAction} action.
PUSH_MODE = 5 #The type of a {@link LexerPushModeAction} action.
SKIP = 6 #The type of a {@link LexerSkipAction} action.
TYPE = 7 #The type of a {@link LexerTypeAction} action.
class LexerAction(object):
__slots__ = ('actionType', 'isPositionDependent')
def __init__(self, action:LexerActionType):
self.actionType = action
self.isPositionDependent = False
def __hash__(self):
return hash(self.actionType)
def __eq__(self, other):
return self is other
#
# Implements the {@code skip} lexer action by calling {@link Lexer#skip}.
#
# <p>The {@code skip} command does not have any parameters, so this action is
# implemented as a singleton instance exposed by {@link #INSTANCE}.</p>
class LexerSkipAction(LexerAction):
# Provides a singleton instance of this parameterless lexer action.
INSTANCE = None
def __init__(self):
super().__init__(LexerActionType.SKIP)
def execute(self, lexer:Lexer):
lexer.skip()
def __str__(self):
return "skip"
LexerSkipAction.INSTANCE = LexerSkipAction()
# Implements the {@code type} lexer action by calling {@link Lexer#setType}
# with the assigned type.
class LexerTypeAction(LexerAction):
__slots__ = 'type'
def __init__(self, type:int):
super().__init__(LexerActionType.TYPE)
self.type = type
def execute(self, lexer:Lexer):
lexer.type = self.type
def __hash__(self):
return hash((self.actionType, self.type))
def __eq__(self, other):
if self is other:
return True
elif not isinstance(other, LexerTypeAction):
return False
else:
return self.type == other.type
def __str__(self):
return "type(" + str(self.type) + ")"
# Implements the {@code pushMode} lexer action by calling
# {@link Lexer#pushMode} with the assigned mode.
class LexerPushModeAction(LexerAction):
__slots__ = 'mode'
def __init__(self, mode:int):
super().__init__(LexerActionType.PUSH_MODE)
self.mode = mode
# <p>This action is implemented by calling {@link Lexer#pushMode} with the
# value provided by {@link #getMode}.</p>
def execute(self, lexer:Lexer):
lexer.pushMode(self.mode)
def __hash__(self):
return hash((self.actionType, self.mode))
def __eq__(self, other):
if self is other:
return True
elif not isinstance(other, LexerPushModeAction):
return False
else:
return self.mode == other.mode
def __str__(self):
return "pushMode(" + str(self.mode) + ")"
# Implements the {@code popMode} lexer action by calling {@link Lexer#popMode}.
#
# <p>The {@code popMode} command does not have any parameters, so this action is
# implemented as a singleton instance exposed by {@link #INSTANCE}.</p>
class LexerPopModeAction(LexerAction):
INSTANCE = None
def __init__(self):
super().__init__(LexerActionType.POP_MODE)
# <p>This action is implemented by calling {@link Lexer#popMode}.</p>
def execute(self, lexer:Lexer):
lexer.popMode()
def __str__(self):
return "popMode"
LexerPopModeAction.INSTANCE = LexerPopModeAction()
# Implements the {@code more} lexer action by calling {@link Lexer#more}.
#
# <p>The {@code more} command does not have any parameters, so this action is
# implemented as a singleton instance exposed by {@link #INSTANCE}.</p>
class LexerMoreAction(LexerAction):
INSTANCE = None
def __init__(self):
super().__init__(LexerActionType.MORE)
# <p>This action is implemented by calling {@link Lexer#popMode}.</p>
def execute(self, lexer:Lexer):
lexer.more()
def __str__(self):
return "more"
LexerMoreAction.INSTANCE = LexerMoreAction()
# Implements the {@code mode} lexer action by calling {@link Lexer#mode} with
# the assigned mode.
class LexerModeAction(LexerAction):
__slots__ = 'mode'
def __init__(self, mode:int):
super().__init__(LexerActionType.MODE)
self.mode = mode
# <p>This action is implemented by calling {@link Lexer#mode} with the
# value provided by {@link #getMode}.</p>
def execute(self, lexer:Lexer):
lexer.mode(self.mode)
def __hash__(self):
return hash((self.actionType, self.mode))
def __eq__(self, other):
if self is other:
return True
elif not isinstance(other, LexerModeAction):
return False
else:
return self.mode == other.mode
def __str__(self):
return "mode(" + str(self.mode) + ")"
# Executes a custom lexer action by calling {@link Recognizer#action} with the
# rule and action indexes assigned to the custom action. The implementation of
# a custom action is added to the generated code for the lexer in an override
# of {@link Recognizer#action} when the grammar is compiled.
#
# <p>This class may represent embedded actions created with the <code>{...}</code>
# syntax in ANTLR 4, as well as actions created for lexer commands where the
# command argument could not be evaluated when the grammar was compiled.</p>
class LexerCustomAction(LexerAction):
__slots__ = ('ruleIndex', 'actionIndex')
# Constructs a custom lexer action with the specified rule and action
# indexes.
#
# @param ruleIndex The rule index to use for calls to
# {@link Recognizer#action}.
# @param actionIndex The action index to use for calls to
# {@link Recognizer#action}.
#/
def __init__(self, ruleIndex:int, actionIndex:int):
super().__init__(LexerActionType.CUSTOM)
self.ruleIndex = ruleIndex
self.actionIndex = actionIndex
self.isPositionDependent = True
# <p>Custom actions are implemented by calling {@link Lexer#action} with the
# appropriate rule and action indexes.</p>
def execute(self, lexer:Lexer):
lexer.action(None, self.ruleIndex, self.actionIndex)
def __hash__(self):
return hash((self.actionType, self.ruleIndex, self.actionIndex))
def __eq__(self, other):
if self is other:
return True
elif not isinstance(other, LexerCustomAction):
return False
else:
return self.ruleIndex == other.ruleIndex and self.actionIndex == other.actionIndex
# Implements the {@code channel} lexer action by calling
# {@link Lexer#setChannel} with the assigned channel.
class LexerChannelAction(LexerAction):
__slots__ = 'channel'
# Constructs a new {@code channel} action with the specified channel value.
# @param channel The channel value to pass to {@link Lexer#setChannel}.
def __init__(self, channel:int):
super().__init__(LexerActionType.CHANNEL)
self.channel = channel
# <p>This action is implemented by calling {@link Lexer#setChannel} with the
# value provided by {@link #getChannel}.</p>
def execute(self, lexer:Lexer):
lexer._channel = self.channel
def __hash__(self):
return hash((self.actionType, self.channel))
def __eq__(self, other):
if self is other:
return True
elif not isinstance(other, LexerChannelAction):
return False
else:
return self.channel == other.channel
def __str__(self):
return "channel(" + str(self.channel) + ")"
# This implementation of {@link LexerAction} is used for tracking input offsets
# for position-dependent actions within a {@link LexerActionExecutor}.
#
# <p>This action is not serialized as part of the ATN, and is only required for
# position-dependent lexer actions which appear at a location other than the
# end of a rule. For more information about DFA optimizations employed for
# lexer actions, see {@link LexerActionExecutor#append} and
# {@link LexerActionExecutor#fixOffsetBeforeMatch}.</p>
class LexerIndexedCustomAction(LexerAction):
__slots__ = ('offset', 'action')
# Constructs a new indexed custom action by associating a character offset
# with a {@link LexerAction}.
#
# <p>Note: This class is only required for lexer actions for which
# {@link LexerAction#isPositionDependent} returns {@code true}.</p>
#
# @param offset The offset into the input {@link CharStream}, relative to
# the token start index, at which the specified lexer action should be
# executed.
# @param action The lexer action to execute at a particular offset in the
# input {@link CharStream}.
def __init__(self, offset:int, action:LexerAction):
super().__init__(action.actionType)
self.offset = offset
self.action = action
self.isPositionDependent = True
# <p>This method calls {@link #execute} on the result of {@link #getAction}
# using the provided {@code lexer}.</p>
def execute(self, lexer:Lexer):
# assume the input stream position was properly set by the calling code
self.action.execute(lexer)
def __hash__(self):
return hash((self.actionType, self.offset, self.action))
def __eq__(self, other):
if self is other:
return True
elif not isinstance(other, LexerIndexedCustomAction):
return False
else:
return self.offset == other.offset and self.action == other.action
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