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tool.py
47 lines (37 loc) · 1.3 KB
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tool.py
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class Entry:
def __init__(self, state, symbol, action=None, **content):
self.state = state
self.symbol = symbol
self.action = action
self.content = content
def __eq__(self, other):
if isinstance(other, self.__class__):
return self.state == other.state and self.symbol == other.symbol
else:
return False
class DictEntry(object):
def __init__(self, action=None, **content):
self.action = action
self.content = content
class Production:
def __init__(self, left, right):
self.left = left
self.right = right
self.index = 0 # 产生式的编号
def __eq__(self, other):
if isinstance(other, self.__class__):
return self.left == other.left and self.right == other.right
else:
return False
class Item:
def __init__(self, left, right, lookahead):
self.left = left
self.right = right
self.lookahead = lookahead
def __eq__(self, other):
if isinstance(other, self.__class__):
return self.left == other.left and self.right == other.right and self.lookahead == other.lookahead
else:
return False
def __str__(self):
return self.left + " " + str(self.right) + " " + self.lookahead