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class SymbolTable:
def __init__(self):
self.symbols = {}
return
def put(self, token, id = None):
try:
id = int(id)
except TypeError:
try:
id = max(self.symbols.values()) + 1
except ValueError:
id = 0
except ValueError:
raise ValueError("only digits as id possible. '%s' is not a number" % id)
self.symbols[token] = id
return id
def get(self, token):
try:
return self.symbols[token]
except KeyError:
return None
def getOrPut(self, token):
try:
return self.symbols[token]
except KeyError:
return self.put(token)
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