def __init__(self, evaluate):
if not callable(evaluate):
raise TypeError, "Expected callable for evaluate"
self.__ev = evaluate
self.funcs = {
# Arithmetic
'+': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) + self.__syToNmb(b))),
'-': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) - self.__syToNmb(b))),
'*': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) * self.__syToNmb(b))),
'/': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) / self.__syToNmb(b))),
'%': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) % self.__syToNmb(b))),
'**': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) ** self.__syToNmb(b))),
# Comparison
'==': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) == self.__syToNmb(b))),
'<=': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) <= self.__syToNmb(b))),
'>=': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) >= self.__syToNmb(b))),
'<': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) < self.__syToNmb(b))),
'>': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) > self.__syToNmb(b))),
'!=': BuiltIn(2, lambda a, b: Value(self.__syToNmb(a) != self.__syToNmb(b))),
# Boolean algebra
'&': BuiltIn(2, lambda a, b: Value(self.__syToBol(a) and self.__syToBol(b))),
'|': BuiltIn(2, lambda a, b: Value(self.__syToBol(a) or self.__syToBol(b))),
'^': BuiltIn(2, lambda a, b: Value(self.__syToBol(a) ^ self.__syToBol(b))),
'!': BuiltIn(1, lambda a: Value(not self.__syToBol(a))),
# List functions
'head': BuiltIn(1, self.__head),
'tail': BuiltIn(1, lambda a: List(self.__syToLst(a)[1:])),
'cons': BuiltIn(2, lambda h, t: List([self.__ev(h)] + self.__syToLst(t))),
'append': BuiltIn(2, lambda a, b: List(self.__syToLst(a) + self.__syToLst(b))),
'map': BuiltIn(2, self.__map),
'filter': BuiltIn(2, self.__filter),
'foldl': BuiltIn(3, self.__foldl),
# Input/Output
'input': BuiltIn(0, lambda: Value(float(raw_input()))),
'print': BuiltIn(1, lambda a: (lambda val: stdout.write("%s\n" % str(val)) or val)(self.__ev(a))),
# Conditional evaluation
'if': BuiltIn(3, lambda cond, yes, no: self.__ev(yes if self.__syToBol(cond) else no)),
# Reading libs TODO: What about a search path?
'import': BuiltIn(1, lambda s: runfile(s.name+FileExt, self.__ev)),
}
#!/usr/bin/python import sys if __name__ == "__main__": if len(sys.argv) > 1: import script from run.evaluate import Environment script.runfile(sys.argv[1], Environment()) else: import console cmd = console.LambdaConsole() cmd.cmdloop()
