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sexprs.py
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sexprs.py
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import reader
class AbstractSexpr:
@staticmethod
def readFromString(string):
return reader.pSexpr.match(string)
def __str__(self):
return ""
class Symbol(AbstractSexpr):
def __init__(self,s):
capital=''
for e in s:
if(e>='a' and e<='z'):
capital=capital+chr(ord(e)+ord('A')-ord('a'))
else:
capital=capital+e
self.sym= capital
def __str__(self):
return self.sym
class String(AbstractSexpr):
def __init__(self,s):
self.sym= s
def __str__(self):
return self.sym
class Boolean(AbstractSexpr):
def __init__(self,s):
self.value= s
def __str__(self):
if self.value :
return '#T'
else:
return '#F'
class Char(AbstractSexpr):
def __init__(self,s):
self.sym= s
def __str__(self):
return "#\\" + self.sym
class Integer(AbstractSexpr):
def __init__(self,value):
self.value = value
def __str__(self):
return str(self.value)
class Fraction(AbstractSexpr):
def __init__(self,Numerator , Denominator):
self.Numerator = Numerator
self.Denominator = Denominator
def __str__(self):
return str(self.Numerator) + "/" + str(self.Denominator)
class Nil(AbstractSexpr):
def __str__(self):
return "()"
class Pair(AbstractSexpr):
def __init__(self, Item1, Item2):
self.Item1=Item1
self.Item2=Item2
def __str__(self):
return "(" + PairToString(self.Item1,self.Item2) + ")"
def PairToString(i1,i2):
if(isinstance(i2, Nil)):
return str(i1)
elif(isinstance(i2, Pair)):
return str(i1) + " " + PairToString(i2.Item1, i2.Item2)
else:
return str(i1) + " . " + str(i2)
def PairToList(i1,i2):
if(isinstance(i2, Nil)):
return [i1]
elif(isinstance(i2, Pair)):
return [i1] + PairToList(i2.Item1, i2.Item2)
else:
return [i1, i2]
class Vector(AbstractSexpr):
def __init__(self, Item):
if(isinstance(Item,Nil)):
self.values=""
else:
self.values= PairToList(Item.Item1, Item.Item2)
def __str__(self):
return "#" + str(self.values)
class Void(AbstractSexpr):
def __str__(self):
return ""